JPH0248140Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pipe welding device used for automatically welding pipe bodies such as steel pipes.

[Prior art]

Recently, the development of devices for automatically welding pipe bodies such as steel pipes is progressing. For example, when automatic steel pipe welding equipment butt-welds the ends of two steel pipes, an annular guide rail is fixed to the outer or inner periphery of one of the steel pipe ends, and a running section equipped with a welding machine is attached to this guide rail. The machine automatically welds the butt parts by running the machine.

[Problem that the invention attempts to solve]

With conventional automatic welding equipment, it is difficult to run the heavy welding machine along the guide rail without causing vibration, so the welding torch is attached to the welding line (groove) at the butt part with high precision. It was difficult to follow this pattern, impairing the reliability of automatic welding. [Means for solving the problem] The present invention has been made in view of the above circumstances, and provides a pipe body that allows a welding machine to run reliably along the weld line on the outer or inner surface of the pipe without vibration. The purpose is to provide welding equipment for.

The present invention is a welding device that runs circumferentially along the circumferential surface of a tube body, and is detachably fixed to the tube body.
A guide portion having an annular shape that is positioned concentrically with the tube when fixed to the tube, and having a U-shaped cross section with both ends thereof extending in the axial direction, and the guide. A guide rail protruding from each extending portion of the section to the opposite side thereof, a rack attached to the guide section, a pinion that engages with the rack, a rotary drive machine for the pinion, and a pusher for each of the guide rails. a running section that includes a plurality of guide wheels that are pressed against each other in a radial direction and an axial direction by a spring and that runs along the guide section;
The present invention is characterized by comprising a welding machine mounted on the traveling section.

〔Example〕

Hereinafter, the present invention will be described in detail based on drawings showing an embodiment in the case of welding the inner surface of a tube at a butt portion. Fig. 1 is a partial front view of the welding device according to the present invention (hereinafter referred to as the device) attached to the inner surface of a steel pipe, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is also taken along the - line. The sectional view and FIG. 4 are also sectional views taken along the - line. In the figure
SP indicates a steel pipe, and the present device is designed to abut the ends of two steel pipes and weld the abutted portion from the inside. On the inner peripheral surface of the end of one steel pipe SP,
A guide part G is fixed, a running part D that moves along the guide part is attached to the guide part G, and a welding machine W is mounted on the running part D. Then, the tip of the torch 51 of the welding machine W moves along the entire circumference of the welding line on the inner circumferential surface of the tube, and the required welding is performed.

The guide part G is detachable from the inner surface of the steel pipe SP, and when fixed to the steel pipe SP, the guide part G is attached to the inner surface of the steel pipe SP.
It has a ring shape that is placed concentrically with the SP.
The guide portion G has a U-shaped cross section with each side portion in the axial direction extending in the axial direction, and forms a guide rail 11 that projects from each extending portion to the opposite side, and A rack 12 is attached to the inner circumferential surface of the guide portion G at a substantially central portion in the width (axial length) direction over the entire circumference. Further, a slip ring 13 is attached to the inner peripheral surface of the guide portion G at a position adjacent to the attachment position of the rack 12 over the entire circumference.

At three positions in the circumferential direction on the outer circumferential surface of the guide portion G, clamp bolts 14, 1 with flat heads are provided.
4 and 14 (two are shown in Figure 1) are screwed together with the head outward, and each clamp bolt 1
4 advances and retracts from the outer circumferential surface of the guide part G by forward and reverse rotation, and due to its advancement, the head becomes the steel pipe SP
By contacting the inner peripheral surface and pressing outward,
The guide part G is fixed concentrically to the inner peripheral surface of the steel pipe SP.

Each side portion of the guide portion G extends further in the axial direction than the guide rail 11, and guide grooves 11b, 11b are formed over the entire circumference at opposing inner surface positions of the extended portions. has been done. Each guide groove 11b has a short cylindrical shape,
Each side of a cover 15 is slidably fitted into the cover 15, which has notches formed at appropriate positions in the circumferential direction into which a running section D (to be described later) can be fitted, and the guide rail 11, the rack 1
2 and the slip ring 13. When the running section D is inserted through the notch of the cover 15 and attached to the guide section G, the cover 15 is pressed by the running of the running section D, and the cover 15 slides in the guide groove 11b. It's summery.

Next, it is attached to the guide part G, and the guide rail 11
The running section D, which is now movable along the road, will be explained. The running part D has a pair of support plates 21, 21 having a longitudinal dimension slightly shorter than the diameter of the guide part G, and is arranged with a distance slightly shorter than the distance between the opposing tips of the guide rail 11. A support base 2 formed by fixing the base end surface of 21 to one surface of the mounting plate 22
0 is installed.

Brackets 23, 23 are attached to the outer surfaces of each longitudinal end of each support plate 21, respectively, and each bracket 23 has a diameter corresponding to the diameter of the guide portion G when the running portion D is attached to the guide portion G. The base end of the support shaft 24, which can freely slide in the direction, is fitted inside, and a guide rail 1
Guide wheels 25, 25 are rotatably attached to each inner circumferential surface of the guide wheels 25, 25, respectively.

Further, at the tip of each support plate 21, guide wheels 27, 27, which are opposed to each guide wheel 25 and separated from each other by the approximate radial dimension of the guide rail, are rotatable via fittings 33, 33, respectively. When each guide wheel 25 is brought into contact with the inner peripheral surface of the guide rail 11, each guide wheel 27 is brought into contact with the outer peripheral surface of the guide rail 11, and eventually the opposing guide wheels 25, 27 The guide rails 11 are gripped and rotated.

At a position closer to the longitudinal center of the support plate 21 than the opposing guide wheels 25 and 27,
Each guide ring 2 is provided on the distal end surface of one support plate 21.
5 and 27 are brought into contact with the inner circumferential surface and outer circumferential surface of the guide rail 11, respectively, when one of the guide rails 11
A guide ring 28 is rotatably attached to the distal end surface (side surface of the central portion in the width direction) so as to be in rolling contact, and a holder 30 is attached to the distal end portion of the other support plate 21. Then, the holder 3
0 includes a guide rail 11 that is provided at the same height position as the guide wheel 28 and that the guide wheel 28 contacts.
A base end portion of a support shaft 31 is slidably fitted to the support shaft 31, which has a guide ring 29 rotatably attached to the tip end thereof, which rolls in contact with the tip end surface of the guide rail 11, which is opposite to the tip end surface. This guide ring 29 is pressed by a pressing spring 32 toward the leading end surface of the guide rail 11 to be brought into contact.
Therefore, the guide wheels 28 and 29 press the respective end surfaces of the guide rail 11 in a direction that separates them from each other, and roll into contact with each other while suppressing the vibration of the entire running section D in the axial direction.

A traveling motor 41 is attached to one end of the mounting plate 22 of the support stand 20 on the side opposite to the side on which the support plate 21 is installed, and the output of the motor 41 is transmitted through a gear to the support The signal is transmitted to a pinion 42 pivotally supported between the plates 21, 21. When each guide wheel is brought into contact with each guide rail 11 through the notch of the cover 15, the pinion 42 is adapted to mesh with a rack 12 provided on the inner peripheral surface of the guide portion G.

On the side opposite to the side on which the support plate 21 is installed in the approximate center of the mounting plate 22, there is a torch 51 whose tip is directed toward the welding line, and the tip of the torch 51 is moved so as to cross the welding direction of the welding line. A weaving device 52 is installed, and a welding torch 5 is installed at the end opposite to the end where the traveling motor 41 is installed.
1 is equipped with a wire feed motor 53 and the like for feeding wire, and these constitute a welding machine W. Welding current and the like to the welding machine W are sent from the slip ring 13 described above through a current collector brush (not shown) that is in sliding contact with the slip ring 13.

Although this embodiment describes a device for welding the inner peripheral surface of a pipe, the present invention can also be applied to welding the outer peripheral surface of a pipe, and in this case, the side part of the guide portion G is extended radially outward. Thus, a guide rail similar to that of the above-mentioned embodiment may be formed.

[Effect]

The welding apparatus according to the present invention constructed as described above is used and operated as follows. First, the guide part G is fitted concentrically into the inner circumferential surface of the end of the steel pipe SP to be welded, and is fixed concentrically to the steel pipe SP by rotating each clamp bolt 14. Next, each of the guide wheels 25 and 27 in the running section D is brought into contact with the inner and outer peripheral surfaces of the guide rail 11 in the guide section G through the notch of the cover 15, and each guide wheel 28 and 29 is brought into contact with each tip of the guide rail 11. The traveling section D is attached to the guide section G by making it contact with the surface. In this case, the 6 pairs of guide wheels of the running section D, a total of 12 guide wheels, will clamp the guide rail 11 from three directions, so there is no risk that the running section D will fall off from the guide section G. Further, when the guide portion G of the traveling portion D is attached, the pinion 42 meshes with the rack 12 of the guide portion G.

In such a state, when the tip of the torch 51 is opposed to the welding line and the traveling motor 41 is rotationally driven, the output of the motor 41 is transmitted to the pinion 42 through the gear, and the pinion 42 is rotationally driven and rotates onto the rack 12. The entire running section D moves along the guide section G along the inner surface of the steel pipe SP in the circumferential direction. At this time, as the running section D travels, the cover 15 is pressed by the running section D and moves along the guide groove 11b of the guide rail 11, and the guide wheel rolls into contact with each surface of the rail section 11a. . As the traveling portion D moves, the torch 51 moves while weaving on the welding line, and the required welding is performed.

〔effect〕

According to the present invention, the guide part that is fixed concentrically to the tube body has both sides extending in the axial direction and is formed into a U-shaped cross section, so that it is lightweight and has high rigidity. Moreover, since the guide wheels are pressed against each other in the axial and radial directions of the guide rails by pressure springs, even if the guide rails are deflected, this is absorbed and stable running is achieved. The present invention has excellent effects, such as reducing the vibrations experienced by the welding machine and improving welding accuracy.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention.
The figure is a partial front view showing the proposed device installed on a steel pipe, Figure 2 is a sectional view taken along the - line in Figure 1, Figure 3 is a sectional view taken along the - line in Figure 1, and Figure 4 is the same. - is a sectional view taken along the line. G... Guide part, D... Running part, W... Welding machine, 11... Guide rail, 12... Rack, 1
3...Slip ring, 14...Clamp bolt, 15...Cover, 20...Support stand, 25,2
7, 28, 29...Guide wheel, 41...Travel motor, 42...Pinion, 51...Torch.

Claims (1)

[Scope of utility model registration request] A welding device that runs circumferentially along the circumferential surface of a tube, is removably fixed to the tube, has an annular shape that is positioned concentrically with the tube when fixed to the tube, and Both sides in the axial direction are attached to a guide part extending in the axial direction and having a U-shaped cross section, and a guide rail and guide part that protrude from each extension part of the guide part to the opposite side. a rack, a pinion that engages with the rack, a rotary drive machine for the pinion, and a plurality of guide wheels that are pressed against and rotated in the radial direction and axial direction of the guide rail by pressure springs, respectively; A tubular body welding device comprising: a running section that runs along the guide section; and a welding machine mounted on the running section.