SU610643A1 - Unit for welding internal and external annular joints of shells - Google Patents

Description

(54) INSTALLATION FOR WELDING OF INTERNAL LONG AND NON-ROUND SEAMS

1 SHUTTERS

image stability, which leads to the need to increase operator optic voltage. The presence of elements with depreciation properties such as a power cable for feeding the welding arc, flux-connecting hose increases the possibility of welding head oscillations and their mechanical resonance. The accuracy of the latter factor is especially increased in the case of welding of longitudinal joints, when an unbalanced cantilever rod with a head at one end is fed into the product, and at the other end a flux apparatus and a drive of a flux-transport mechanism operate.

The purpose of the invention is to facilitate the changeover of the installation from the welding of longitudinal welds to the welding of circumferential welds and the improvement of the quality of welding.

For this, the proposed installation is equipped with a bracket hinged on the console, the axis of rotation of which coincides with the axis of the welding nozzle, while the transmitting camera and flux suction device are fixed diametrically opposite to the welding nozzle.

FIG. 1 shows the proposed installation, a general view; ya fig. 2 — node I in FIG. one; in fig. 3 is a view along arrow A in FIG. 2

The installation consists of a component mounted on a trolley 2 with a drive 3, which provides the possibility of adjustable movement with working and cruising speed. The carriage 5 carrying the cantilever 6 vertically moves along the column with the help of the actuator 4. The cantilever 6 is fastened to the carriage 5 by means of a parallelogram suspension by means of the pu r 7 equal to the length. The console 6 is provided with two pairs of self-aligning support rollers 8 (of the type of rollers), the npifMeM bracket 9 carrying them pivotally connected to the vertical movement mechanism 10, is mounted; ; on the free end of the console 6.

A cassette 11 and a horizontal guide 12 for the welding wire 13, a flux apparatus 14 for collecting the melted flux and an actuator 15 of the flux trap 16 located inside the console are mounted on the console. At the head of the latter, a hopper 17 with a corrugated tube 18 is mounted. To receive flux from the conveyor 16 and transfer it to the funnel 19 of the welding head 20, which is connected to the console 6 by means of a longitudinal movement mechanism 21 provided with a drive 22.

The welding head 20, consisting of a feeding mechanism 23 and a mouthpiece 24 connected to each other by means of a bottom bracket 25, is equipped with a transverse displacement mechanism 26 and an angular reversal mechanism 27. In addition, a top bracket 28 is fixed on the feeding mechanism, which serves as a support for the swivel bracket 29 carrying the transfer chamber 30 and having the possibility of rotation around the hollow hinge cylindrical pin 31, which is simultaneously a vertical guide for the welding wire 13, and around the mouthpiece

24, the axis of which coincides with the longitudinal axis of the finger 31. Thus, the camera 30 is rotated at a 90 ° angle around the electrode from the longitudinal position to the transverse or vice versa with the possibility of fixation in these polos. For this purpose, the bracket 29 is provided, for example, with a spring-loaded swinging latch 32, cooperating with the bracket 28 and providing a rigid connection of the bracket with the latter in the indicated positions

Simultaneously with the camera 30, the turn receives a fluo-sump 33, hinged on the lower part of the brace 29, diametrically opposite the chamber 30. The flexible hose 34 connects the fluo-sump 33 to the fluo-apparatus 14. The installation works as follows. When welding longitudinal knocks, the trolley 2, moving with the marching speed, brings the welding head 20 to the place of the start of welding. In this case, the chamber 30 and the fluo-suction unit 33 are fixed in a position in which their longitudinal axes lie in a plane parallel to the plane of the welded joint. By vertical movement of the carriage 5, the console b is lowered with the head 20 until the rollers 8 are supported on the surface of the product to be welded. By further briefly moving the Bbiaie carriage 5, the console’s navigation

in the vertical direction, which allows copying the surface of the product being welded and keeping the distance from the latter to the mouthpiece 24 during the welding process constant.

The exact head output to the source) for starting the welding position (fine tuning) is performed using mechanisms 21 and 26, respectively, the longitudinal and transverse movements, and the mechanism 10 of vertical movement provides the ability to adjust

the required distance from the surface to be welded to the mouthpiece 24.

After the start of the welding process, the carriage 2, moving at a working speed, makes movement of the head 20 along the welded joint, and the trajectory of this movement is controlled according to the image on the screen of the video monitoring device. If necessary, the position of the electrode relative to the joint is corrected by means of the transverse displacement mechanism 26. When welding the annular joints, the camera 30 and the flux emitter 33 are rotated at a 90 ° angle, occupying a position in a plane parallel to the joint plane, and fixed in this position with the retainer 32. planes, i.e., the head is supplied to the place of the beginning of welding, is produced by moving the carriage 2 at the main speed, and fine tuning is done by the mechanism 2 of the longitudinal movement. Pre,

if necessary, an offset from the zenith of the welding electrode and its inclination to the surface of the product being welded is provided; these tuning operations are performed by mechanisms 26 and 27, respectively, of lateral movement and angular rotation.

Lowering the carriage 5 in order to obtain