JPH0252588B2 - - Google Patents

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 direction and the axial direction, a welding device that rotates along the outer circumferential surface of the pipe is installed at an outer position of the pipe, and the tip of 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 in a pipe, and the welding torch and tip are inserted into a pine 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 weight of the torch, or the space constraints within the rotation range of the torch, so it is relatively long. It was not possible to weld the inside of a long pipe. Furthermore, 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 is an apparatus for welding the inner surface of a cylindrical workpiece, which eliminates the above-mentioned drawbacks, makes it possible to easily weld the inner surface of a long cylindrical workpiece, and prevents the wire from twisting. An object of the present invention is to provide a welding torch movement and wire feeding mechanism in the present invention.

In order to achieve the above object, the present invention includes an 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 outer cylinder; an inner cylinder rotating device supported within the inner cylinder and rotating the inner cylinder against the inner peripheral surface of the outer cylinder; a torch moving device that is supported within the inner cylinder and moves the welding torch and the wire tip simultaneously in the axial direction of the workpiece and in the direction perpendicular thereto;
A reel rotatably supported within the inner cylinder for winding the wire; and a wire feeder for feeding the wire wound on the reel onto the inner peripheral surface of the inner cylinder in an arc direction to the wire tip. It is characterized by having a supply department.

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, and FIG. 2 is a partially cross-sectional plan view thereof.
3 is a cross-sectional side view taken in the direction of the − arrow in FIG. 1, FIG. 4 is a cross-sectional front view showing the wire feeding mechanism in the − arrow direction of FIG. 3, and FIG. 6 is a plan view thereof, FIG. 7 is a cross-sectional side view taken in the direction of the arrow in FIG. 6, FIG. be. For convenience of explanation, the drawings are shown horizontally in Figs. 1, 2, 4 to 6, but when implementing this embodiment, the left side in Figs. It is placed in an upright position.

In Figures 1 and 2, 1a and 1b are 2
The two outer cylinders are 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 penetrating in the radial direction is formed in a portion of the outer peripheral surface of the one outer cylinder 1a. Also,
Although not shown, the other outer periphery 1b is connected by a rope or the like to a hoisting device located outside of the workpiece above it, and the hoisting device is used to weld an upright pipe-shaped object, for example. Object to be welded (not shown)
It is inserted into the interior from above and moved in the vertical direction.

The internal gear barrel 2 has a part of its inner peripheral surface fixed to the internal gear 2a, and 3a and 3b are two side covers that are fastened to the outer end surfaces of the outer barrels 1a and 1b, respectively. The inside is sealed. 4a and 4b are 2
one inner cylinder supporting cylinder, and one outer cylinder 1a, respectively.
It is rotatably supported by ball bearings 4c and 4d spaced apart from each other on the inner peripheral surface. 5a and 5b are two ball bearing holders each formed in a ring shape and fastened to the outer end surfaces of the inner cylinder support cylinders 4a and 4b in order to fix the movement of the ball bearings 5a and 5b in the axial direction. has been done.

Reference numeral 6 is an inner cylinder, and both ends thereof are attached to the two inner cylinder support cylinders 4 so as to be rotatable on the inner circumferential surface of the one outer cylinder 1a.
A part of the outer peripheral surface of the window 1c is sandwiched between a and 4b.
A window 6a is provided to open at a position connected to. Reference numeral 7 is an inner cylinder rotating mechanism, and a motor 702 is supported within a motor case 701 that is fixedly supported on the inner peripheral surface of the inner cylinder 6 and is connected to an external drive source (not shown), and this motor case 701. shaft end 70 of
2, and a pinion 705 that meshes with the internal gear 703 via an intermediate gear 704.
Reduction gear case 706a fastened to the end of 01
The differential gear set 707 built in and this differential gear set 7
07 pinion 705 is fixedly supported at one end thereof, and a driven shaft 708 is rotatably supported in a gear case 706b which is fastened to the end of the reduction gear case 706a, and the inner teeth are fixedly supported by this driven shaft 708 and are fixedly supported at one end thereof. A pinion 709 meshing with the gear 2a, and a gear case 70 fixedly supported by the tip of the driven shaft 708 and fastened to the reduction gear case 706a.
A potentiometer 713 is formed from a pair of gears 710 and a pinion 711 housed in the gear case 706c, and a potentiometer 713 that fixedly supports the pinion 711 at the end of the shaft and is housed in a cover 712 that is fastened to the end of the gear case 706c. .

Therefore, the inner cylinder rotating mechanism 7 is connected to the motor 7.
02 is driven by an external drive source, it is decelerated by the differential gear set 707, the driven shaft 708 rotates, and the pinion 709 rotates while meshing with the internal gear 2a. The inner cylinder 6 that supports the moving device 7 rotates the inner peripheral surface of one outer cylinder 1a. At the same time, as the driven shaft 708 rotates, 1
A potentiometer 713 rotates via a pair of gears 710 and a pinion 711 to detect the rotation angle of the inner cylinder 6, and when this reaches a predetermined angle, a command is issued to an external drive source to drive the motor 702. can be stopped. Reference numeral 8 denotes a torch moving mechanism, and a motor case 8 is fixedly supported on the inner circumferential surface of the inner cylinder 6 at a position separated by a predetermined angle from the inner cylinder rotating mechanism 7 , and is fastened and supported in series with each other.
01, intermediate case 802 and slider case 8
03, and a gear case 80 that are fastened and supported vertically to each other at the extended position of the slider case 803.
4 and a case 805. The motor case 801 supports in parallel two motors 806 and 807 connected to an external drive source and two potentiometers 808 and 809 outside thereof.

The intermediate case 802 is connected to the two motors 80.
Two gears 810, 811 and two coupling rings 8 fixedly supported on the shaft ends of 6, 807, respectively.
12,813 and the potentiometer 808,8
Two pinions 814 are fixedly supported on the shaft ends of 09 so as to mesh with the gears 810 and 811.
815. Above slider case 8
03 includes two guide bars 816 and 817 fixedly supported at both ends with a space between them, a slider 818 whose both ends are slidably supported by the guide bars 816 and 817, and this slider 8.
Nut 819 whose outer peripheral surface is fixedly supported within 18
and is screwed and supported in the center of this nut 819,
A screw shaft 820 fixedly supports one coupling ring 812 at one end, an end face of a flange part 821a is fastened and supported by the end face of the slider 818, and a tip of the outer peripheral surface of a shaft part 821b is fastened to the slider case 803. The slide bar 821 is slidably supported in a bearing 822, the outer circumferential surface of the large diameter portion 823a is rotatably supported in the slider 818, and the outer circumferential surface of the small diameter portion 823b is supported in the slide bar 821. The gear case 804 at the tip is rotatably supported via a ball bearing 824.
A hollow shaft 823 having worm teeth 823c formed in the inserted portion thereof 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 other one is fixedly supported at the tip of one small diameter end portion 825b. fixedly supports the coupling ring 813, and the small diameter other end 82
5c is provided on a rotating shaft 825 that is inserted into an elongated hole 823d formed in a small diameter portion 823b of the hollow shaft 823. The gear case 804 is fixedly supported at the tip of the outer peripheral surface of the shaft portion 821b of the slide bar 821, and a bellows 826 is inserted between the end surface and the bearing 822, and the worm teeth 8 are inserted inside the gear case 804.
23c, the worm wheel 827 is fixedly supported in the center, and both ends are rotatably supported by the gear case 804, and a pinion is provided at one end of the worm wheel 827, which is visible inside the case 805. A shaft 829 that fixedly supports the shaft 828 is provided. 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 a slider 831 fixed at the center of the slider 831. a shaft 832 whose supported tip is rotatably supported by the case 805 and whose tip protrudes outward from the case 805;
A rack 833 is fixedly supported above the shaft 832 at the center of the slider 832 and the slider 831 and meshes with the pinion 828, and a rack 833 is fixedly supported at the tip of the shaft 832 and the torch 9 is fixedly supported at the tip. A lever 834 is provided, and a bellows 835 is inserted between the lever 834 and the case 805. Therefore, when one motor 806 is driven, the torch moving mechanism 8 moves the screw shaft 8 through one coupling 812.
20 rotates and a nut 819 that screws and supports this
The slider 818 is connected to the two guide bars 8 through
16 and 817, the slide bar 821 fastened to this slider 818 moves the torch 9 in the direction of the arrow A-A shown in FIG. 5 via the gear case 804 and the case 805.
At the same time, the gear 8 at the shaft end of one of the motors 806
10 and a pinion 814 meshing therewith, one potentiometer 808 rotates to detect the amount of movement of the torch 9 in the A-A arrow direction, and when the torch 9 moves a predetermined amount, the one motor A command is issued to an external drive unit (not shown) that drives motor 806 to stop the drive of one of the motors 806 . When the other motor 807 is driven, the rotating shaft 825 rotates through the other coupling 813, and the worm teeth 823c rotate through the hollow shaft 823, rotating the worm wheel 827, so that the shaft 829 and pinion 828 rotate.
The rack 833, the slider 831 and the 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 gear 811 at the shaft end of the other motor 807 and the pinion 18 meshing with the gear 811
5, the other potentiometer 809 rotates to detect the amount of movement of the torch 9 in the B-B arrow direction. The drive of the other motor 807 can be stopped by issuing a command to the drive section. 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 the lever 834 of the torch moving device 8
A wire guide portion 1003 is fastened to the wire guide portion 1003. The wire feeding section 1001 includes a motor case 1004 and a holder 1005 that are fastened and supported in series, and the motor case 100
A motor 1006 is supported in the holder 1.
A shaft 1008 is rotatably supported by a ball bearing 1006 on the shaft 1005 and connected to the motor 1007.
, one feed roller 1009 fixedly supported by this shaft 1008, and this one feed roller 100.
9, a shaft 1012 fixedly supporting the other feeding roller 1010, and having both ends rotatably supported by the holder 1005 with ball bearings 1011; axis 1
008 and 1012 are fixedly supported by the holder 1005 in a direction perpendicular to the axes of the rollers 1008 and 1012, with the inner openings facing the opposing portions of the two feed rollers 1009 and 1010, and the outer openings facing the inner cylinder 6. Two wire guides 10 each fixedly support one end of tubes 12a and 12b surrounding the wire 11 toward the inner peripheral surface.
12a and 1012b. Therefore, the wire feeding section 1001 is connected to the motor 100.
6 is driven, the shaft 1008 moves one feed roller 1009 and then the other feed roller 1010 to the third
Since the tube 12a is rotated in the direction of the arrow shown in the figure, the tube 12a is supported by one wire guide 1012a.
The inner wire 11 is connected to the other wire guide 1012b.
can be fed into the tube 12b supported by the tube 12b. The wire feeding reel part 1002 has a shaft part 1013a inserted into an opening hole 3b formed in the axial center of one of the side covers 3a, and a flange part 1013b fixed to the side end surface of the side cover 3a. 1013, a reel 1014 rotatably supported on the outer circumferential surface of the bearing 1013, a plate-shaped guide plate 1015 fastened to the distal end surface of the bearing 1013, and one end of which is connected to the guide plate 1015. A guide 101 is fastened to one end, has a hole 1016 passing through the other end, and supports the other end of the tube 12a supported by the one wire guide 1012a in the hole 1016.
It is formed from 7. 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 1 of the wire feeding section 1001.
009 and 1010 rotate in the direction of the arrow, the reel 1014 around which the wire 11 is wound rotates on the outer peripheral surface of the shaft 1013a of the bearing 1013 and feeds the wire 11 into one tube 12a supported by the guide 1017. can do. The wire guide section 1003 is connected to the torch moving device 8.
The support plate 1018 is fastened and supported by the lever 834 of
and a tip 1019 that is supported by the tip of the support plate 1018 and has a tip 1019 facing on the extension line 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 the other wire guide 1 of the wire feeding section 1001 is provided at the rear end thereof.
The other tube 12 has one end supported by the tube 012b and is arranged in an arc shape on the inner circumference of the inner cylinder 6.
The wire 11 in the tube 12b is sent out from the front end of the hole onto the extension line of the tip of the torch 9 outside.

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, 1b 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 workpiece in the circumferential direction, when the inner cylinder rotation mechanism 7 is driven, the inner cylinder 6 moves into the outer cylinder 1.
The tip of the torch 9 rotates along the inner circumferential surfaces of the welding parts a and 1b, and moves the welding position of the workpiece in the circumferential direction via the torch moving mechanism 8 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 and 1010 move the wire 11 wound around the outer circumferential surface of the reel 1014 onto the inner circumferential surface of the inner cylinder 6 in an arc shape. It is fed to the chip 1019.

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

Further, when the torch 9 welds the workpiece in the axial direction, this can be done 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 drawings]

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, FIG. 3
Fig. 5 is a cross-sectional front view showing the wire feeding mechanism as viewed from the - arrow in the figure; Fig. 5 is a cross-sectional front view showing the torch mechanism;
The figure is a plan view, FIG. 7 is a cross-sectional side view taken in the direction of the arrow in FIG. 6, FIG.
The figure is a cross-sectional side view taken in the direction of the arrows in FIG. 8. 1a, 1b...2 outer cylinders, 2...internal gear cylinder, 2a...internal gear, 3a, 3b...2 side covers, 4a, 4b...inner cylinder support cylinder, 6...
Inner cylinder, 7 ...Inner cylinder rotation mechanism, 8 ...Torch moving mechanism, 9...Torch, 10...Wire feeding mechanism, 1
001... Wire feeding section, 1002... Wire feeding reel section, 1003... Wire guide section, 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; a supported inner cylinder; an inner cylinder rotating device supported within the inner cylinder for rotating the inner cylinder against the inner circumferential surface of the outer cylinder; a torch moving device that moves the object to be welded in an axial direction and a direction perpendicular thereto; a reel that is rotatably supported within the inner cylinder and that winds a wire;
A cylindrical cover is provided with a wire feeding section that feeds the wire wound on the reel on the inner peripheral surface of the inner cylinder in an arcuate direction to the tip supported by the torch moving device. Torch movement and wire feeding mechanism in internal welding equipment for workpieces.