JPH0239672Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an apparatus for automatically welding large pipes, and more particularly to an apparatus for accurately guiding equipment such as a welding torch that moves in the circumferential direction of a pipe.

<Prior Art and its Problems> Conventionally, when connecting large-diameter pipes, in a factory, a welding device was fixedly positioned and the large-diameter straight pipe was rotated to perform butt welding. Rotating such a large diameter pipe itself requires large-scale equipment, but in addition to this, when this large pipe is made into a curved pipe, it is necessary to rotate the straight pipe section to be butt welded. If you try to hold the pipe in place, the bent part at the other end will swing around, and even if you hold the straight part firmly, the force applied to the holding part will change due to the imbalance due to the weight of the bent part depending on the rotational position of the pipe. , an undesirable situation occurs in controlling the welding speed. On the other hand, a space is required for the swinging of the bent pipe, resulting in a waste of safety and factory space. For this reason, pipes with bends are not rotated, and are placed on a pedestal and skilled welders have to repeat manual welding by moving upwards and downwards, making it impossible to perform narrow gap welding with a groove width of 10 mm. , delays in the work process,
This causes problems such as increased processing costs.

In addition, in large boilers or chemical equipment for power generation, etc., there are many large diameter pipes, and the number of butt welded parts for piping is enormous. In addition, such welding must be performed at a high location on-site in an environment with insufficient scaffolding, and there was a strong desire to realize automatic narrow-gap welding of large pipes from the standpoint of safety and obtaining high-quality welds. It is a place.

For this reason, the inventors have separately proposed a device capable of fully automatic welding of large diameter pipes. (Special application 1986-243479
(No.) The outline of this welding device will be explained using Fig. 3. The tow truck 15 is disposed at a position symmetrical to the automatic welding device 9 on the axis 14 of the large-diameter pipe 13, and its weight is approximately equal to and balanced with the traveling automatic welding device 9. The automatic traveling welding device 9 and the tow truck 15 are simply connected by a chain 16.
If the two are simply connected by a chain, the chain 16 will come into contact with the outer surface of the large diameter tube, which will not only damage the outer surface of the large diameter tube but also increase the driving force of the traction truck. For this purpose, two tension carts 17 are provided to apply tension to the chains so that the chains 16 do not come into contact with the outer circumferential surface of the large-diameter pipe, and are arranged to face each other about the axis of the large-diameter pipe. The resistance, that is, the driving force is kept small.

In the device configured as described above, the entire device moves in the circumferential direction of the large diameter pipe 13 via the chain 16 by the driving force of the towing cart 15, and this movement causes arc welding (especially M1G
welding) is performed. In this apparatus, an important factor for obtaining good welding quality is accurately moving the welding torch 4 along the groove.
In other words, it is necessary to accurately move the traveling automatic welding device along a predetermined circumference of the outer peripheral surface of the pipe 13.

<Purpose of the present invention> The present invention was constructed in view of the above-mentioned problems, and is intended to accurately move a welding torch attached to a device that travels on a pipe surface, such as a traveling automatic welding device, and to achieve a good performance. The object of the present invention is to provide a guiding device for obtaining a weld.

<Summary of the present invention> In short, the present invention consists of a copying member configured to partially insert the edge portion into the groove, and by attaching this copying member to the wheels of the device, etc., the groove and the movement trajectory of the device are The structure is such that the values are kept constant.

<Example> FIG. 1 is a detailed view of a travel guide device, and FIG. 2 is a travel automatic welding device equipped with this guide device.
Mainly in FIG. 1, reference numeral 30 indicates the axis of the traveling guide device, and 20 is a central axis disposed within this axis 30 so that the axes are equal. The central shaft 20 is screwed onto the wheels 21 of the welding device main body so that its rotation axis coincides with the axis of the central shaft 20. 29 is a knob for rotating the central axis for screwing. 23a,
Reference numeral 23b denotes a dish-shaped guide member that is inserted into the guide member attachment shaft 30 and placed so as to face it, and the end edges of both guide members are positioned within the groove 24. Reference numeral 25 denotes a spring disposed within the guide member, which applies a repulsive force to move both guide members away from each other. 31 and 32 are stoppers that are screwed together with the mounting shaft 30, and when the entire guide device 11 is removed from the wheel 21, each guide member 23a, 2
3b is prevented from spreading excessively. In the illustrated case, both guide members are configured to allow movement of a certain distance in the axial direction of the shaft 30 by arranging a certain space between the stoppers 31 and 32, but the guide member 23a is More accurate guidance will be possible if the distance L from the edge of the distal end to the wheel end is maintained constant by attaching a guiding device to the shaft 30 by screwing it or fixing it by welding or the like. Furthermore, if the guide member 23a is configured to be screwed together with the shaft 30, the distance L itself can be adjusted. In addition, in the case of a structure in which both guide members can move to some extent as shown in the figure, even if the groove has a small meandering difference, the guide members can move well and be effective.

Next, installation of the device having the above configuration will be explained.

Before installing the device, stoppers 31, 32
This allows the guide members 23a, 23b to be positioned close to each other against the repulsive force of the spring 25 so that the guide portions 23a, 23b can easily enter the groove 24. Next, the flange portion 30a of the shaft 30 is placed in close contact with the end surface of the wheel 21. 33 is a pressing member engaging body attached to the end of the shaft 30 facing the flange portion 30a. In addition, when arranging the flange portion 30a in close contact with each other, the center shaft 20 must be pulled out, or at least the tip of the threaded portion 20a may be placed in close contact with the flange portion 30a.
The main body of the device is set in a retracted state in the direction a, so that the main body of the device can be attached from the X direction. After the flange portion 30a is placed in close contact with the wheel, the threaded portion 20a of the center shaft is screwed into a screw hole formed in the wheel 21. As the center shaft 20 moves toward the wheel 21 side, the pressing member 34 attached to the center shaft 20
The shaft 30 is attached by pressing the flange portion 30a of the shaft 30 into close contact with the wheel 21 via the engaging body 33. In this state, the stoppers 31 and 32 are loosened so that the outer edges of the guide members 23a and 23b come into close contact with the inner surface of the groove. Note that the pressing member 34 may be fixedly attached to the central shaft, but if it is configured to be screwed onto the central shaft, the pressing force can be adjusted more effectively.

<Effects> By carrying out the present invention, the device traveling on the tube surface can draw an accurate traveling trajectory, improving welding quality, and moreover, the guide member can be easily attached and detached.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a travel guide device showing an embodiment of the present invention, FIG. 2 is a detailed view of a travel automatic welding device to which the travel guide device is attached, and FIG. 3 is an overall view of the automatic welding device. 11... Travel guide device, 20... Central axis, 21
...Wheels, 23a, 23b...Guide members, 24...
...Bevel, 25...Spring, 28...Stopper, 30
...Guide member mounting shaft.

Claims (1)

[Claims for Utility Model Registration] 1. A guide member mounting shaft disposed on the wheels of a device that moves in the circumferential direction of the pipe along the pipe surface, and a guide member mounting shaft that is attached to this shaft and each end edge of which is open. A travel guide configured to include a pair of guide members located inside the front, and a central shaft inserted into the guide member mounting shaft and connected to the wheel, and fixing the guide member mounting shaft to the wheel. Device. 2. In the traveling guide device set forth in claim 1 of the utility model registration claim, of the pair of guide members, the guide member located on the traveling device side is screwed to the shaft, and the wheels of the traveling device and the guide member are screwed together. Structured so that the spacing can be adjusted. 3 Utility Model Registration In the traveling guide device according to claim 1 or 2, a stopper is provided on at least one side of the pair of guide members, and the stopper prevents the arrangement of the pair of guide members. Structured so that the interval can be adjusted.