JPS61216866A - Mechanism for torch moving and wire feeding in inner face welding device of cylindrical body to be welded - Google Patents

Abstract

PURPOSE:To perform the good welding of the inner face of the body to be welded without any kink of a wire by equipping with the shaft of a torch and the moving mechanism in radial direction on the rotary inner cylinder inside the outer cylinder inserted into the cylindrical body to be welded by an external part driving mechanism, wire reel and a feeding mechanism. CONSTITUTION:An inner cylinder 6 is fitted freely rotatably by a motor 702 in the outer cylinders 1a, 1b which are inserted into the cylindrical body to be welded which is vertically set up. A torch 9 moving mechanism 8 is provided in an inner cylinder 6, moving the torch 9 by the motor in axial direction and radial direction and approaching the tip of the torch 9 to the zone to be welded by window 1c, 6a. A wire reel 1002 and wire feeding mechanism 10 are equipped on the inner cylinder 6 as well to feed a wire 11 to a tip 1019 via guide pipe. The weld can be executed well therefore by the external control without any conventional kink and twist.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torch movement and wire feeding mechanism in an apparatus for welding the inner surface of a cylindrical workpiece.

Conventionally, for example, according to Japanese Patent Application Laid-Open No. 56-84174,
When welding the inner surface of a pipe in the circumferential and axial directions, a welding device that rotates along the outer circumferential surface of the pipe is installed at a position outside the pipe, and an arm that protrudes outward from the welding device is attached to the outside of the pipe. An apparatus has been proposed in which a welding torch and a wire feeding tip are provided at the tip, and the welding torch and tip are inserted into a pipe to weld the inner surface of the pipe.

However, with this configuration, the length of the pipe to which the inner circumferential surface is welded is limited due to the deflection of the arm during rotation due to the torch's own weight, or space constraints within the rotation range of the torch, so it is difficult to weld relatively long pipes. Internal welding could not be performed. In addition, since the tip always rotates together with the torch, the wire is twisted and excessive force is applied locally, making it difficult to easily return the twisted wire to its original state.

The present invention eliminates the above-mentioned drawbacks, enables easy welding of the inner surface of a long cylindrical object, and prevents twisting of the wire. An object of the present invention is to provide a welding torch movement and wire feeding mechanism in an apparatus.

In order to achieve the above object, the present invention includes a cylindrical outer cylinder which is movably inserted into a cylindrical workpiece and which is moved in the axial direction by a drive mechanism located outside the workpiece. an inner cylinder rotatably supported on the inner peripheral surface of the cylinder; an inner cylinder rotating device supported within the inner cylinder and configured to rotate the inner cylinder against the inner peripheral surface of the outer cylinder; A torch moving device is supported in the inner cylinder and moves the welding torch and the wire tip simultaneously in the axial direction of the workpiece and in a direction perpendicular thereto; It is characterized by being provided with a reel for winding the wire, and a wire feeding section that feeds the wire wound on the reel onto the inner peripheral surface of the inner cylinder in the arc direction to the wire tip. It is.

Embodiments of the present invention will be explained below with reference to FIGS. 1 to 9, which show embodiments of the present invention. Note that FIG. 1 is a cross-sectional front view showing the entire device of the present invention, FIG. 2 is a partial cross-sectional plan view thereof, and FIG.
■A cross-sectional side view taken in the direction of the arrows; FIG. 4 is a cross-sectional front view showing the wire feeding mechanism in the ■-■ arrow view of FIG. 3; FIG. 5 is a cross-sectional front view showing the torch moving mechanism; and FIG. 6 is its plan view. Figure 7 is the 6th
8 is a cross-sectional side view taken in the direction of the ■ arrow in FIG. 7, and FIG. 9 is a cross-sectional side view taken in the direction shown in the ■ arrow in FIG. 8.

For convenience of explanation, the drawings are shown horizontally in Figs. It is placed in an upright position.

In FIGS. 1 and 2, la and lb are two outer cylinders formed with the same diameter, and are fastened in series in the axial direction with the internal gear cylinder 2 in between. A welding window 1c that penetrates in the radial direction is bored in a portion of the outer peripheral surface of the outer cylinder 1a. Although not shown, the other outer periphery 1b is connected by a rope or the like to a hoisting device located above the object to be welded. It is inserted into the object to be welded (not shown) from above and moved in the vertical direction.

1. The internal gear cylinder 2 has an internal gear 2a on a part of its inner peripheral surface.
3a and 3b fixing the outer cylinders 1a and 3b are two side covers that are fastened to the outer end surfaces of the outer cylinders 1a and lb, respectively, to seal the inside. 4a and 4b are two inner cylinder support cylinders, each of which has a spherical axis d4 spaced apart from the inner circumferential surface of one of the outer cylinders 1a.
It is rotatably supported by c and 4a. 5a, 5b
is made up of two ball bearing holders, each formed into a ring shape,
In order to fix the movement of the ball bearings 5a, 5b in the axial direction, they are fastened to the outer end surfaces of the inner tube support tubes 4a, 4b.

Reference numeral 6 is an inner cylinder whose both ends are sandwiched between the two inner cylinder support cylinders 4a and 4b so as to be rotatable on the inner peripheral surface of the one outer cylinder 1a, and a part of the outer peripheral surface is attached to the window IC. A window 6a that opens at the connection position is provided. 7 is an inner cylinder rotation mechanism,
Motor case 70 fixedly supported on the inner peripheral surface of the inner cylinder 6
1 and a shaft end 702 of this motor case 701.
The internal gear 703 fixedly supported by the internal gear 7
03 through an intermediate gear 704, and a differential gear set 707 built into a reduction gear case 706a fastened to the end of the motor case 701.
The pinion 705 of the differential gear set 707 is fixedly supported at one end, and the driven shaft 708 is rotatably supported in a gear case 706b which is fastened to the end of the reduction gear case 706a. A binion 709 that is fixedly supported by 708 and meshes with the internal gear 2a, and the driven shaft 70
The reduction gear case 706 is fixedly supported at the tip of the gear case 706.
A pair of gears 710 and a binion 711 are built in a gear case 706c fastened to the gear case 706c, and a potentiometer 71 is built in a cover 712 that fixedly supports the binion 711 at the end of the shaft and fastened to the end of the gear case 706c.
It is formed from 3.

Therefore, when the motor 702 is driven by an external drive source, the inner cylinder rotating mechanism 7 is decelerated by the differential gear set 707, the driven shaft 708 rotates, and the pinion 709 meshes with the internal gear 2a. Since the inner cylinder rotating device 7f and the supporting inner cylinder 6 rotate the inner circumferential surface of one of the outer cylinders 1a. ° At the same time, as the driven shaft 708 rotates, a pair of gears 710 and a pinion 711tJi
Then, the potentiometer 713 rotates to detect the rotation angle of the inner cylinder 6, and when this reaches a predetermined angle, a command can be issued to an external drive source to stop the drive of the motor tough 02. Reference numeral 8 denotes a motor case 801 which is a torch moving mechanism and is fixedly supported on the inner circumferential surface of the inner cylinder 6 at a position at a predetermined angle with respect to the inner cylinder rotating mechanism 7, and is fastened and supported in series with each other. , an intermediate case 802, a slider case 803, and a gear case 80 that is vertically fastened and supported at an extended position of the slider case 803.
4 and a case 805.

The motor case 801 has two motors 806' and 8'07 connected to an external drive source inside and two motors 806' and 807 outside.
Potentiometers 808 and 809 are supported in parallel.

The intermediate case 802 is connected to the two motors 806°80
Two gears 810.8 each fixedly supported at the shaft end of 7.
11 and two couplings 812 and 813, and the gear 81 is attached to the shaft end of the potentiometers 808 and 809.
．． Two pinions 814 and 815 are fixedly supported by the husband and wife so as to mesh with each other. The slider case 803 has two guide bars 816 and 817 fixedly supported at both ends with a space therebetween, a slider 818 whose both ends are slidably supported by the guide bars 816 and 817, and A nut 819 whose outer circumferential surface is fixedly supported within the slider 818; a screw shaft 820 which is threadedly supported in the center of the nut 819 and whose one end fixedly supports the one coupling 812; A slide par 821. has an end face of a seven rack part 821a fastened and supported, and a tip of the outer peripheral surface of a shaft part 821b is slidably supported in a bearing 822 fastened to the slider case 803. The outer peripheral surface of the large diameter portion 823a is rotatably supported within the slider 818, and the outer peripheral surface of the small diameter portion 823b is rotatably supported within the slide par 821 via a ball bearing 824, and the gear case at the tip. A hollow shaft 823 having worm teeth 823c formed in the portion inserted into the hollow shaft 804 and a large diameter portion outer circumferential surface 825a are fixedly supported on the inner circumferential surface of the large diameter portion 823a of the hollow shaft 823, and the above-mentioned The other coupling 81
3 is fixedly supported, and the other small diameter end 825C is connected to the hollow shaft 82.
The rotary shaft 825 is inserted into an elongated hole 823d formed in the small diameter portion 823b of No. 3. Gear case 80 above
4 is fixedly supported at the tip of the outer peripheral surface of the shaft portion 821b of the slide par 821, and a bellows 826 is inserted between the end surface and the bearing 822, and the worm tooth 823C is inserted inside.
A worm wheel 827 that meshes with the gear case 8 is fixedly supported in the center, and both ends are connected to the gear case 8.
04, and a shaft 829 fixedly supporting a pinion 828 is provided at one end of the shaft 829, which is rotatably supported by the shaft 828. The case 805 has two guide bars 830 fixedly supported at both ends with a space therebetween, a slider 831 whose both ends are slidably supported by the guide bars 830, and the slider 831.
a shaft 832 whose distal end is fixedly supported at the center of the slider 832 and whose distal end is rotatably supported by the case 805 and whose distal end projects outward from the case 805; a rack 833 that is fixedly supported on the upper part of the pinion 832 and meshes with the pinion 828;
A lever 834 is fixedly supported at the tip of the shaft 832 and fixedly supports the torch 9 at the tip, and a bellows 835 is inserted between the lever 834 and the case 805. Therefore, when the torch moving mechanism 8 is driven by one motor 806, one of the couplings 812
The screw shaft 820 rotates through the screw shaft 820, and the slider 818 moves along the two guide bars 816 and 817 through the nut 819 that screws in and supports it. moves the torch 9 in the direction of the arrow A-A shown in FIG. One potentiometer 808 rotates to detect the amount of movement of the torch 9 in the A-A arrow direction, and an external drive unit (not shown) that drives the one motor 806 when the torch 9 moves a predetermined amount. A command is issued to stop the driving of one of the motors 806. When the other motor 807 is driven, the rotating shaft 825 rotates via the other coupling 813, and the worm teeth 823C rotate via the hollow shaft 823, rotating the worm wheel 827. The rack 833, slider 831, and shaft 832 are moved along the two guide bars 830, and the torch 9 at the tip of the lever 834 supported by the shaft 832 is moved in the direction of arrow B-B shown in FIG. At the same time, the other potentiometer 809 is rotated via a gear 811 at the shaft end of the other motor 807 and a pinion 815 that meshes with the gear 811 to adjust the amount of movement of the torch 9 in the B-B arrow direction. When the torch 9 is detected and moved by a predetermined amount, a command can be issued to an external drive unit that drives the other motor 807 to stop the other motor 807 from driving.

Reference numeral 10 denotes a wire feeding mechanism, which includes a wire feeding section 1001 fixedly supported on the inner circumferential surface of the inner cylinder 6, and a wire feeding reel section 1 fastened to the axial center of the one side cover 3a.
002 and a wire guide portion 1003 fastened to the lever 834 of the torch moving device 8.

The wire feeding unit 1001 includes a motor case 1004 and a holder 1005 that are fastened and supported in series, and a motor 1006 is supported within the motor case 1004.
A shaft 1008 is rotatably supported by the holder 1005 with a ball bearing 1006 and connected to the motor 1007, and one feed roller 1 is fixedly supported by the shaft 1008.
009, the other feed roller 1010 that is in contact with this one feed roller 1009, and this other feed roller 10
10, and a shaft 1012 rotatably supported at both ends by ball bearings 10111C in the holder 1005;
The two shafts 1008 and 1012 are fixedly supported by the holder 1005 in a direction perpendicular to their axes, and the inner openings are
A tube 12a that surrounds the wire 11 with its outer opening facing the opposing portions of the feeding rollers 1009 and 1010 and the inner circumferential surface of the inner cylinder 6.

It is formed from two wire guides 1012a and 1012b that fixedly support one end of wire guide 1012b. Therefore, when the motor 1006 drives the wire feeding section 1001, the shaft 1008 rotates one feeding roller 1009 and then the other feeding roller 1010 in the direction of the arrow shown in FIG. 3, so that it is supported by one wire guide 1012a. The wire 11 in the tube 12a can be fed into the tube 12b supported by the other wire guide 1012b. The wire feeding reel part 1002 has a shaft part 1013a inserted into an opening hole 3b bored in the axial center of the one side cover 3a, and a flange part 1013b.
The bearing 1013 is fastened to the side end surface of the side cover 3a.
A reel 1014 is rotatably supported on the outer circumferential surface of the bearing 1013, a plate-shaped guide plate 1015 is fastened to the distal end surface of the bearing 1013, and one end thereof is connected to the guide plate 1015. The tube 1 is fastened to one end, has a hole 1016 passing through the other end, and is supported by the one wire guide 1012a in the hole 1016.
The kite 1017 supports the other end of the kite 2a. As is clear from FIG. 3, one of the tubes 12a is arranged in an arc shape on the inner peripheral surface of the inner cylinder 6.

Therefore, the wire feeding reel section 1002 is connected to the two feeding rollers 1009 and 101 of the wire feeding section 1001.
0 rotates in the direction of the arrow, the wire 11 is wound around the outer periphery of the shaft 1013a of the bearing 1013, and the wire 11 is fed into one tube 12a supported by the guide 1017. be able to. The wire guide section 1003 is connected to the torch moving device 8.
The tip 1019 is supported by the tip of the support plate 1018, and the tip 1019 faces the extension of the tip of the torch 9.

Note that the tip 1019 has a hole (not shown) that passes through the inside thereof in the axial direction, and one end of the tip 1019 is supported by the other wire guide 1012b of the wire feeding section 1001 at the rear end thereof, and the tip 1019 is connected to the inner tube 6. The rear end of the other tube 12b arranged in an arc shape on the inner peripheral surface is supported, and the wire 11 in this tube 12b is sent out from the front end of the hole onto the extension line of the tip of the torch 9 outside. It's like that.

With the above configuration, the entire welding apparatus of the present invention is inserted into the object to be welded, and the tip of the torch 9 is approximately positioned at the welding part.

Thereafter, when the torch moving mechanism 8 is driven, the tip of the torch 9 is moved in the axial direction of the outer cylinders 1a, lb and in a direction perpendicular thereto, and the tip of the torch 9 is positioned at the position shown in FIG. do.

Next, when welding the objects to be welded in the circumferential direction, when the inner cylinder rotating mechanism 2 is driven, the inner cylinder 6 becomes the outer cylinder 1a.

The tip of the torch 9 rotates along the inner circumferential surface of the torch 9 and moves the welding position of the workpiece in the circumferential direction via the torch moving mechanism in the inner cylinder 6. In this case, the torch mechanism 8 and wire feeding mechanism 10 supported within the inner cylinder 6 rotate while maintaining their current state. Further, as the torch 9 welds the object to be welded, the tip of the wire 11 gradually wears out. Therefore, when the motor 1006 of the wire feeding section 1002 is driven during welding, the two feeding rollers 1009
．． 1010 is a chip 1019 in an arc shape by placing the wire 11 wound on the outer circumferential surface of the reel 1014 on the inner circumferential surface of the inner cylinder 6.
to be sent to.

Therefore, even when the torch 9 welds the object to be welded in the circumferential direction, the wire can be prevented from twisting.

Furthermore, when the torch 9 welds the workpiece in the axial direction,
This can be carried out by moving the entire welding apparatus of the present invention in the axial direction using a hoist.

As described above, the present invention has the effect of being able to easily weld the inner surface of a long cylindrical object to be welded with a simple structure and preventing the wire from twisting.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional front view thereof, FIG. 2 is a partially sectional plan view thereof, and FIG. 3 is a section l1 of FIG. 1.
4 is a sectional front view showing the wire feeding mechanism as seen from the ■-■ arrow in FIG. 3, FIG. 5 is a sectional front view showing the torch mechanism, and FIG. 7 is a cross-sectional side view taken in the direction of the ■ arrow in FIG. 6, FIG. 8 is a cross-sectional side view taken in the ■ arrow direction in FIG. 7, and FIG. 9 is a cross-sectional side view taken in the ■ arrow direction in FIG. la, lb...2 outer cylinders, 2...internal gear cylinder, 2
a...Internal gear, 3a, 3b...2 side covers, 4a, 4b...Inner tube support tube, 6...Inner tube, 7.
...Inner cylinder rotation mechanism, 8...Torch moving mechanism, 9...
Torch, 1°... Wire feeding mechanism, 1001... Wire feeding section, 1002... Wire feeding reel section, 10
03... Wire guide part, 11... Wire.

Claims (1)

[Claims] 1. An outer cylinder that is movably inserted into a cylindrical object to be welded and is moved in the axial direction by a drive mechanism located outside the object to be welded, and is rotatable on the inner peripheral surface of this outer cylinder. an inner cylinder supported within the inner cylinder; an inner cylinder rotation device supported within the inner cylinder for rotating the inner cylinder against the inner circumferential surface of the outer cylinder; and a welding torch supported within the inner cylinder. a torch moving device that moves the workpiece in the axial direction of the workpiece and in a direction perpendicular to the welding object; a reel that is rotatably supported within the inner cylinder and around which the wire is wound; A torch moving device for internal welding of a cylindrical workpiece, characterized in that a wire feeding section is provided on the inner circumferential surface of the torch for feeding the wire to the tip supported by the torch moving device in an arcuate direction. Wire feeding mechanism.