MXPA00010477A - Device for welding cylindrical workpieces - Google Patents

Abstract

A device for welding cylindrical parts or rotating bodies. An axially displaceable electrode shaft (1) is provided in a rotationally mounted tubular axle. The tubular axle (8) can be rotated in relation to the electrode shaft (1) and a connector head (4) is provided on one end of said axle (8). The connector head is fitted with gripping elements (5) for a replaceable protection chamber (3). Gripping and positioning elements for a replaceable fixing cartridge (31) intended for parts that are to be welded are arranged in the protection chamber (3). The electrode shaft (1) extends through the connector head (4) into the protection chamber (3).

Description

APPARATUS FOR THE WELDING OF WORK PARTS OF A CYLINDRICAL SHAPE FIELD AND BACKGROUND OF THE INVENTION When welding work pieces of cylindrical shape, the joining surfaces generally have two kinds of shapes. In workpieces of cylindrical shape transversely spaced along the longitudinal axis, the ends meet in a straight line and the impact surfaces form a circle. In this type of joint by welding it is a union by rotation welding, which is easy to be machined. If the cylinders are located at a certain angle to each other, a geometrical shape is formed on the shock surface, the shape of which depends on the diameters of the cylinders and the angle at which they meet with one another on the centerline of the cylinders. cylinders If there are more cylinders of those branched, tubular branches, to a base cylinder, which also remain close to each other, the welding to the present from the outside is complicated. Such constructions can be, for example, the multi-way valve housing, filter body, tubular branches and corresponding construction sites. In the welding of tubular branches and especially in branches in T represent, the scarce heights of the exit neck in the base cylinder and the large of the welding torches, a real problem. The problem or problems can be eliminated when the welding position of the cylinder is solved from inside. Then small heights of the exit neck are formed or a second branch in the vicinity, which is on the outside does not represent any impediment. The welding torch is at the height of the seam, while the workpiece or the torch rotates around the axis itself. A second problem zone is long work pieces, whose rotation can not be easily carried out. A typical example for that is, when the distribution chambers of a tube must be made, - where several branches are welded to the tube. The coaxial direction of the cylinders against each other has enormous significance. To guarantee the quality of the welding seam, the work pieces must protect the oxygen in the air, when the work pieces are enclosed in a chamber filled with a protective gas. To keep the amount of protection gas and the filling time to a minimum, the camera should be as small as possible. The small size of the camera, again causes problems when placing the work pieces in the retention that is in the camera. Due to the low size of the camera you can not simultaneously work with your hands on the camera and look in the camera.

SUMMARY OF THE INVENTION The invention proposes the task of creating an installation, with which these problems can be put aside and especially the expense of protective gas can be reduced, the size of the pieces to be welded is also varied . This task is solved on the basis of the characteristics indicated in claim 1. Advantageous embodiments are presented in the sub-claims.

BRIEF DESCRIPTION OF THE FIGURES Below one embodiment of the invention is considered in more detail with reference to the accompanying drawings. They show: Figure 1 an installation according to the invention seen from the side, where the portion above the central line is represented in a longitudinal section; Figure 2 a more detailed example of a protection chamber, as provided in an installation according to Figure 1, and for which protection cassettes provided for the parts to be welded have been placed in the protection chamber; and Figure 3 schematically shows the combination of protection chamber and fixing cassette from the front side, thus in the axial direction of the installation.

DESCRIPTION OF THE INVENTION A tubular shaft 8, which is rotatably mounted with bearings 10 with respect to the pedestal 12, belongs to the installation shown in FIG.

The carrier rod 1 of the welding electrode 2 is a long shaft, which is concentrically engaged with the tubular shaft 8 by the tubular shaft 8. Between the electrode rod 1 and the tubular shaft 8 there is a tube of insulating material 9, which serves as a support between those parts. The electrode rod l and the tubular shaft 8 are thus rotatable with respect to each other, and in addition the electrode rod l can move in the axial direction. The tubular shaft 8 is surrounded by a separate sleeve 6 which rotates together with it, wherein protection channels 7 are formed and where a widening ends, forming a connection head 4. The sleeve 6 extends only in a fraction of the length of the tubular shaft 8. Next to the connection head 4 is the sleeve 6 surrounded by a rotatable equipment sleeve 11, which is fixed to the pedestal 12, to prevent its rotation. This equipment sleeve or pedestal 11 has the necessary connections for the protective gas, the cooling gas and for the pressurized air necessary for the closing cylinder of the protective chamber 3. Between the sleeves 6 and 11 there are rotatable connections for the formation of the necessary gas connections in the channels 7 provided in the sleeve 6, which end in the connection head 4. In Figure 1 only one channel 7 is shown, but of those channels there are naturally several, conveniently distributed in the periphery of the sleeve 11 and of the connection head 4. A threaded bushing 5 with internal thread 5 is provided in the connection head 4, into which the protection chamber 3 can be connected by means of a screw connection. Also the position and fixing means 31 for the parts A, 9 to be welded are fixed in the threaded bushing 5 of the connection head 4. This is only shown schematically in Figure l.In figure 2 it is shown more exactly an example of embodiment, wherein the floor part 32 of the protection chamber 3 is provided with a forward projecting neck 38, which is surrounded by a threaded sleeve 37, by means of which the chamber 32 can be fixed to the threaded bushing 5. The upper part 33 of the chamber 3 is allowed to close with the bar 35 of the piston of a cylinder 34. The upper part 33 is guided in the vertical guides 48, the upper ends of which are fixed in the cylinder 34. With the sealings 36 ensures that, the chamber 3 is hermetic. The shed 31 provided for the workpieces to be welded, is conducted by the guides provided on the floor of the chamber, is pushed into the chamber 3. The guides 39 run parallel to the axial direction of the rod of the electrode 1, where The case is slid in the axial direction of the electrode rod to the position proposed for it. At the edges of the floor of the fixing house 31, slots 40 are provided for the guides 39. The workpieces to be welded are correctly positioned with respect to the welding electrode 2. For the installation that can be made in the axial direction, at the end of the guides 39 a stop 41, which can be fixed or axially adjustable. A spring-loaded pressure element 50 is arranged in the lid of the chamber, which, if the upper part of the chamber has been lowered, finds the rear corner of the case 31, stopping the stand on its upper and rear side. 32 fixed in its place and position. In the case represented, the arms 42, which are allowed to swing around a pivot point 43, have arms at the ends that have a retaining part loaded by spring 45, which it grabs in the house behind the upper edge of its front side 46. From the retaining portion 45 emerge the sleeves 44, sleeves containing springs, which are pressed between the floor of the sleeves 44 and the ends of the arms 42. If the retaining part 45 in figure 2 towards the right pulls against the force of the springs, the arms 42 swing upwards around the axis 43. The pieces to be welded are placed in the caste 31, if it is outside the chamber 3 .

Typically there are in the booths 31 two per chamber 3, so that if one booth 31 is in the chamber 3, the other booth 31 can be filled with the parts to be welded.A set screw 47 determines the position of the booth 31. the parts, and downwardly tilting arms 42 hold the parts to be welded in their position and place. Since both the protective chamber 3 and the fixing stand 31 can be replaced, they can be dimensioned to the minimum size for each work piece size, which reduces the cost of the protective gas to a minimum. The impeller 19 drives the drive wheel 15, which with the connecting spindles 14 and 17 is detachable, which selectively rotates either on the tubular shaft 8 gripping the driving wheel 13 or on a driving wheel 16 mountable in a rotatable tubular shaft 8. rough 16 gripping by means of a flange of insulating material 19 in the electrode rod l, If one of the drive rods 13 and 16 is activated, the other remains in the pedestal 12 'stopped without turning, in the case shown, connects the spindle of the rotating impeller in the tubular shaft 8. and stops the electrode rod l without turning.

In this case, the connecting head 4 and the camera fixed thereto 3 together with the fixing stand 31 rotate together with the tubular shaft 8. The parts to be welded A, B rotate with respect to the welding electrode 2. Since the connection gas have been brought to the rotary connection head 4, can by means of hoses 43 be connected to the chambers 3, as shown in Figure 2. If a geometric shape formed by two cylinders is to be welded, the welding electrode should 2 follow the arched shape of the joint position. This is achieved by means of a threaded shaft 30 driven by a motor 29, which pushes a horizontal guide 28, which in turn is pushed by a complete unit composed of a cylinder 25 and an arm 26. Arm 26 takes the rod electrode 1, whose long spring movement can be materialized with the cylinder 25, which the arm 26 and a horizontal guide 27 moves them with respect to the horizontal guide 28. The objective of the spring movement is to bring the electrode 2 to the work position and then remove it from it, while with the motor 29 1 precision movement made during welding, materializes the arched shape of the joint position. The precision thrust motor 29 is programmatically controlled, its movement of displacement depends on the rotational movement of the tubular shaft 8. The welding current is brought to the welding position from a current source 22, which is connected by means of a power cable to a slip ring 21 fixed in the rod l. The ground cable is connected to a sliding ring 24, which is located on a flange 23. There is an electrical connection 49 of the flange 23 to the protective chamber 3 and again to the fixed fixing house 31. The support sleeve insulator 9 and the insulating flange 18 securely establish that the tension applied to the rod 1 does not pass to other parts of the installation. the invention is not limited to the example that has been represented. In particular, the construction and the shape of the protection chamber 3 can vary, and with this the positioning and fixing means 31 can be associated in many ways. The essential thing is that with the same gripping elements 5 they are fixed in the connection head 4, where they can be exchanged together against the fixing and positioning means and the chambers, which each time adjust to the tubular parts that have to be fixed. weld in its shape and dimensions.

Claims (9)

1. NOVELTY OF THE INVENTION Having described the invention as above, the content of the following is claimed as property: CLAIMS l. - Installation for the welding of cylindrical parts and rotating bodies, to whose installation they belong: an electrode rod which is an axis that carries the welding current to the welding electrode; -fixing and fixing means for the parts to be welded; and a tubular shaft that surrounds the electrode rod, which is mounted with respect to the equipment as well as the rod of the electrode in a rotatable manner, an installation characterized in that a connection head, which is provided with gripping elements, is fixed in the tubular body. for a changeable protection chamber, the changeable positioning and fixing means in connection with the protection chamber are arranged in such a way that they are fixed in the connection head with the same gripping elements as the protection chamber, and to the installation in addition belongs: means for rotating the tubular shaft together with the connection head and the protection chamber to the connected head and the means of positioning and fixing; - means for retaining the electrode rod, so that during the rotation of the tabular axis it remains without rotating; - means for the movement of the rod of the electrode axially in relation to the tubular axis.
2. 2. - Installation according to claim 1, characterized in that the positioning and fixing means are in the protection chamber.
3. 3. - Installation according to claim 2, characterized in that a changeable fixing house belongs to the positioning and fixing means and in the protection chamber, grip and position elements for the exchangeable fixing house have been provided.
4. 4. Installation according to claim 3, characterized in that there are guides to the gripping and positioning elements in which the fixing house can be pushed into the protection chamber in the axial direction of the electrode rod to the position for that. planned.
5. 5. - Installation according to claim 1, characterized in that means belong to the installation, with which the rod of the electrode is rotated, while other means are connected to the tubular shaft without rotating.
6. 6. - Installation according to claim 1, characterized in that a thread bushing is provided in the connection head, in which a threaded sleeve protruding from the protection chamber can be connected by means of a threaded connection, and the thread bushing is connected to a sleeve part that surrounds the tubular shaft and is rotatable, in which channels for the shielding gas are provided, which are connected to the protection chamber by hoses arranged between the head connection and protection camera.
7. 7. - Installation according to claim 1, characterized in that a motor equipped with a threaded shaft belongs to the means for the axial movement of the electrode rod.
8. 8. - Installation according to claim 7, characterized in that the axial movement of the rod of the electrode is controlled in such a way that it is simultaneously carried out with the rotation movement of the rod of the electrode and the tubular shaft and depending on that movement .
9. 9. Installation according to claim 1, characterized in that, the rod of the electrode is mounted on the tubular shaft by means of a tube of insulating material provided intermediate.