JPS622905B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the invention] (Industrial field of application) The present invention relates to an apparatus for welding and overlay welding, and in particular for automatic welding along workpiece surfaces during welding and overlay welding. The present invention relates to a welding head guide device for guiding a welding head of an apparatus.

The present invention is most suitable for welding and overlay welding of curved surfaces of large fixed workpieces, such as the cylindrical inner surface of large pipes and hard spherical inner surfaces.

The invention is also applicable to welding curved joints, such as circular and semicircular pipes to cylindrical walls, and to machining curved surfaces of large fixed workpieces.

(Prior Art and Problems Thereof) A known device for guiding the welding head of an automatic welding device along the workpiece surface during welding and overlay welding is, for example, U.S. Pat. No. 3,997,757, as shown in FIG. There is something to show.

This device is equipped with a double arm lever R that has a feeler F fixed to its lower end for following the machining surface and is rotatably supported approximately at the center at a pivot point P. , welding head H
a contact point that gives commands to move the feeler F in vertical and horizontal directions, and
A mechanical device is provided for elastically biasing the.

The double arm lever R allows the feeler F to move in two orthogonal directions relative to one plane. During the movement of the feeler F along the processing surface, when the position of the feeler F changes, the lever arm A connected to the feeler F is displaced, and based on this displacement, it is vertically moved to the welding head H via the contact point. and a command to move horizontally.

The mechanism for elastically biasing the feeler F against the processing surface in this device includes an elastic member acting through a lever arm A supporting the feeler F and biasing the welding head H in vertical and horizontal directions. It consists of an electric motor for

When this known device is used for welding,
The feeler F can follow the workpiece surface only when a guide groove G serving as a guide is formed in the workpiece to be welded.

That is, the feeler F is inserted into this guide groove G and moves along it using this as a guide.

The device in such an application operates as follows.

During the filling of various finishing passes in welding, if the feeler F is not engaged between the guide grooves G or if the guide groove G is not formed, the filler F is moved by the guide groove G. It is not supported, and furthermore, the following process is obstructed.
This is because the horizontal displacement motor moves the welding head H and the device to the limit position, ie until the feeler F detects the guide groove G, against any obstacle.

For this reason, it is practically impossible to use the conventional device for welding during the finishing pass in overlay connections and during overlay welding, since there is usually no guide groove. In many applications, such as welding or overlaying critical parts, it is not possible to provide guide grooves. This is because forming such guide grooves deteriorates the quality of the machined surface. for example,
In other applications, such as overlay welding of curved workpieces, forming guide grooves is difficult and uneconomical.

The object of the invention is to provide a device for guiding the welding head of an automatic welding device along the workpiece surface during welding and overlay welding.

In the device of the invention, a double-arm lever supported at a pivot point, a mechanism for elastically biasing the feeler against the workpiece surface, and their mutual relationship are used to weld and fix workpieces in the finishing pass. It is now possible to perform overlay welding on workpieces containing the material without a guide groove.

[Structure of the invention]

(Means for solving the problem) The purpose is to provide a double arm lever with a feeler and a pivot point mounted on one arm to follow the work surface and to move the welding head vertically and horizontally. of an automatic welding device along a workpiece surface during welding and overlay welding, having a contact device of the group for giving a command to move the filler to the workpiece surface, and a mechanism for elastically biasing said feeler against the workpiece surface. In a welding head guide device for guiding a welding head, the pivot point consists of a pivot pin fixed at one end to the casing of the welding head and supporting the double arm lever at the other end, the double arm lever being It consists of one arm that supports a feeler and the other arm that is not equipped with a feeler, and said one arm is composed of two parts, one part of which is movable relative to the other part, and , comprising a group of contact devices for providing a command to move the welding head in a vertical direction, said other arm comprising a group of contact devices for providing a command to move the welding head in a horizontal direction, said other arm having a group of contact devices for providing a command to move the welding head in a horizontal direction, said On the other hand, the mechanism for elastically biasing the feeler is via a counterweight attached to the other arm of the double arm lever and the pivot point interposed between the two parts of the one arm. This is achieved by comprising a counterweight and a cooperating spring.

(Function) The device of the invention ensures that finishing pass welding of build-up connections and build-up welding of workpieces, including fixed workpieces, can be carried out without the use of guide grooves.
This is achieved by the action of the feeler of the device, said feeler moving along the working surface on the contact device, said contact device elastically moving the movable part of the arm connected thereto and said feeler. A command is given to vertically move the welding head via the spring of the biasing mechanism. As a result of this movement of the filler, the welding head of the automatic welding device is moved in the vertical direction without the use of guide grooves, so that, for example, circular welding and overlay welding of cylindrical walls are possible.

the balance of the mechanism for said feeler to act on a contact device which elastically biases the arm, pivot point and feeler connected thereto during movement of the feeler along the working surface; The welding head is moved horizontally when a signal is applied via the weight to cause the welding head to move horizontally.

As a result of such movement of the feeler, the welding head is moved horizontally in the welding and overlaying directions. This combined displacement of the filler in two directions makes it possible, for example, to weld a cylindrical pipe to a cylindrical wall and, for example, to overlay a spherical surface.

Therefore, the device of the present invention makes it possible to follow various curved surface portions during welding and overlay welding. This ability to track the welding head of automatic welding equipment eliminates discontinuities and voids that may occur when there are localized curved defects on the surface, allowing the welding head to It can be applied to overlay welding.

To simplify the construction of the invention and increase the reliability of the device, parts of the arms are movable relative to other parts by means of their telescoping connections. Part of the contact device of the group providing the command for vertically moving the welding head is preferably mounted on one part of the arm, and the other part of the contact device of this group is mounted on another part of the arm. Preferably. The part of the contact devices of the group providing the command for horizontal movement of the welding head is preferably connected to an arm without said feeler, the other part of the contact devices of this group Preferably, it is mounted on the casing of the welding head.

With such an arrangement of contact devices, while the feeler moves along the workpiece surface, the displacement of the feeler is imparted by said contact device to the welding head, which can be vertically and horizontally adjusted with great accuracy. It is converted into a signal that causes movement in the direction. This is because the contact device is arranged so as to be in direct contact with the processing surface.

The contact device for providing signals for moving the welding head in both directions may consist of an electromechanical limit switch for ease of maintenance and repair.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

As shown in the figure, a device for guiding a welding head of an automatic welder along a workpiece surface during welding and overlaying has a double-arm lever 1 and a pivot point 2. One arm 3 of the double arm lever 1 is equipped with a feeler 4 (Fig. 1) or a feeler 5 (Fig. 2) for following the machining surface 6 (Fig. 1) or the machining surface 7 (Fig. 2), respectively.
support each.

It also has a group 8 of movable contacts 9 and fixed contacts 10 for providing signals for moving the welding head 11 (FIG. 1) or the welding head 12 (FIG. 2) of the device in the vertical direction; It has a group 13 of movable contacts 14 and fixed contacts 15 for providing commands to move the heads 11, 12 in the horizontal direction.

The device has feelers 4, 5 on the processing surfaces 6, 7.
It also has a mechanism for elastically biasing.

According to the invention, the pivot point 2 is constituted by a pivot pin, which pivot pin is connected to the welding heads 11, 12.
casing 16 (Fig. 1) and casing 17 (second
(Fig.), and the other end of this pivot pin rotatably supports the double arm lever 1. One arm 3 of the double arm lever 1 supporting said feelers 4, 5 consists of two parts 18 and 19, one part 18 of which is movable relative to the other part 19. It is configured. One arm 3 of the double arm lever 1 supports the movable contacts 9 of said group 8;
A fixed contact 10 is arranged adjacent to the movable contact 9. This group 8 includes welding heads 11 and 12.
It is used to give commands to move vertically. The other arm 20 of the double-armed lever 1 does not have feelers 4, 5, and it supports the movable contacts 14 of said group 13, and adjacent to said movable contacts 14 the fixed contacts 1
5 are arranged. This group 13 is for giving commands to move the welding heads 11, 12 in the horizontal direction. The mechanism for elastically biasing the feeler against the machined surface is
It has a counterweight 21 and a spring 23 attached to the other arm 20 of the double arm lever 1 via a shaft 22, and this spring 23 is connected between one part 18 and the other part 19 of one arm 3. and one end of it is incorporated into the feeler 4,
5 via a portion 18, and the other end is configured to cooperate with a counterweight 21 via a pivot point 2. One part 18 of one arm 3 of the double-arm lever 1 is configured to be movable relative to the other part 19, and this relative movement is caused by the telescopic connection of these parts 18, 19. It is done by doing. Welding heads 11, 12
The movable contact 9 of group 8 for giving a command to move vertically is the double arm lever 1
The other fixed contact 10 of group 8 is mounted on the other part 19 of one arm 3 of the double-armed lever 1. The movable contacts 14 of the group 13, which provide the command for horizontal movement of the welding heads 11, 12, are connected to the other arm 20 of the double-arm lever 1.
This other arm 20 does not have feelers 4, 5, and the other fixed contacts 15 of the same group 13 are connected to the casing 1 of the welding heads 11, 12.
6, 17. Welding head 1
The contact devices 9, 10 and 14, 15 providing commands for moving 1, 12 in both directions may be constituted by electromechanical limit switches.

The device for guiding the welding head for automatic welding along the workpiece surface during welding and overlaying operates as follows.

Before starting welding and overlaying, the device passes through one part 18 of one arm 3 of the double arm lever 1 the spring 23 and this arm 3.
Via the other part 19 and the pivot points 2, a counterweight 21 is mounted so as to bias against the feelers 4, 5, working surfaces 6, 7 of the device. In this position, the contact devices 9, 19 and 1
4 and 15 are open.

Then, a drive device for displacing the welding heads 11, 12 of an automatic welding device (not shown) is activated. The device moves together with the welding heads 11, 12 of the automatic welding device and its casing 16, 17 along the working surfaces 6, 7.

If the machining surfaces 6, 7 change their degree of curvature, the portion 19 of one arm 3 of the double arm lever 1;
The feelers 4, 5 are biased through the spring 23 of the mechanism that elastically biases the feelers 4, 5 against the work surface, and the movable contact 9 and the fixed contact 1
0 makes contact and provides a signal to move the welding heads 11, 12 vertically. Furthermore, the movable contact 14 is biased into contact with the fixed contact 15 via the counterweight 21 of the mechanism that elastically biases the portion of one arm 3 of the double arm lever 1, the pivot point, and the feelers 4, 5. and generates a signal to move the welding heads 11, 12 in the horizontal direction.

The automatic welding heads 11, 12 can be moved vertically or horizontally together with the device according to the invention by opening the contact devices 9, 10 and 14, 15 again.
1 and 12 until the transmission of commands for moving them in the respective directions is completed. The use of the device according to the invention for tracking the workpiece surface allows the welding head of automatic welding equipment to weld and overlay curved surfaces of fixed workpieces, resulting in the formation of a high-quality metal surface layer with a constant arc length. Ru.

〔Effect of the invention〕

Since the present invention has the above-described configuration, the welding head can be reliably guided without providing a guide groove as in the conventional case.

Therefore, it is possible to perform welding and overlay welding on various curved surface parts, and there is an effect that even if there is a local defect, no discontinuity or blank area will occur.

[Brief explanation of the drawing]

FIG. 1 is an overall longitudinal cross-sectional view of the device according to the invention for guiding the welding head of an automatic welding device along the processing surface in welding circular joints and surface treatment of cylindrical walls and spherical surfaces; FIG. FIG. 3 is a longitudinal cross-sectional view of the same apparatus according to the present invention for welding a pipe to a fixed cylindrical wall and surface-treating a cylindrical pipe as a fixed processed product. FIG. 3 is a front view showing a conventional example. 1... Double arm lever, 2... Pivot point (pivot pin), 4, 5... Feeler, 9, 10...
...Contact device, 11, 12...Welding head, 14,
15... Contact device, 16, 17... Casing,
21... Counterweight.

Claims (1)

[Scope of Claims] 1. A double arm lever 1 with feelers 4, 5 mounted on one arm and a pivot point 2 for following a processing surface 6, 7, a welding head 11,
contact devices 9, 10 and 14, 15 of groups 8, 13 providing commands for vertically and horizontally displacing 12 and elastically biasing said feelers 4, 5 against the working surfaces 6, 7; In the welding head guide device for guiding the welding head of an automatic welding device along the processing surface during welding and overlay welding, the pivot point 2 has one end attached to the casing of the welding head 11, 12. 16, 17, and the other end supports the double arm lever 1, and the double arm lever 1 has one arm 3 supporting the feelers 4, 5 and the feelers 4, 5. The one arm 3 is composed of two parts 18 and 19, one part 18 of which is movable relative to the other part 19, and the welding head 11, 12, said other arm 20 comprises a group 8 of contact devices 9, 10 for providing commands to move the welding heads 11, 12 in the vertical direction; and a group 13 of feelers 4, 4 for the working surfaces 6, 7
The mechanism for elastically biasing the arm 5 includes a counterweight 21 attached to the other arm 20 of the double arm lever 1 and two parts 1 of the one arm 3.
A welding head guide device characterized in that it consists of a spring 23 cooperating with a counterweight 21 via the pivot point 2 interposed between 8 and 19. 2. One part 18 of one arm 3 of the double-armed lever 1 is configured to be movable relative to the other part 19 by virtue of the parts being telescopically connected together. A welding head guide device according to claim 1, characterized in that: 3. A part of the contact device 9 of group 8, which provides the command for vertical movement of the welding heads 11, 12, is mounted on one part 18 of one arm 3 of the double-arm lever 1, and a part of the contact device 9 of the same group 8 Welding head guide device according to claim 1, characterized in that the further contact device (10) is mounted on the other part (19) of one arm (3) of the double-arm lever (1). 4 Contact device 1 of group 13 giving a command to move the welding heads 11, 12 in the horizontal direction
4 is mounted on the other arm 20 of the double-arm lever 1, which arm 20 does not have feelers 4, 5, and the other contact device 15 of the same group 13 is mounted on the other arm 20 of the double-arm lever 1, and the other contact device 15 of the same group 13 is The welding head guide device according to claim 1, characterized in that it is mounted on the casings (16, 17). 5 Contact devices 9, 10, 14, 1 giving commands to move the welding heads 11, 12 in both directions
5. The welding head guide device according to claim 3, wherein 5 is an electromechanical limit switch.