RU2404037C1 - Method and device for welding flat panel necks to manifold pipes - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to method and device for welding flat panels necks to manifold pipes. First, halves of all circular seams and lengthwise seam of flat panel necks collars on the tubes on both sides of manifold unit. Then manifold unit is turned through 180° for second halves of circular seams and tube lengthwise seam to be welded. Circular seams are made with seam ends overlapped, while lengthwise seams are welded with the torch crosswise oscillation. Device frame 6 accommodates two manipulators 4 and 5 fitted on driven carriages 7 and 8 to move along said frame, said manipulators being fitted with welding torches 11 with their drives 12. Receiving table 13 has crosswise travel drive, screw clamps and guides. Manipulator 4 houses rotation drive, while manipulator 5 houses spring clamping mechanism 18. Both manipulators incorporate two-prism-like grips. Welding torches 11 are arranged on guides representing toothed segments 20 jointed with rotation drives 21 and secured on carriages 22 with lengthwise travel drives 23 and thrusts 24 to limit carriage travel in feeding their welding torches to manifold pipe.

EFFECT: higher quality of welded seams, simplified operation and higher efficiency.

2 cl, 2 dwg

Description

The invention relates to welding production, and more specifically to devices for welding flat panels with a collector pipe, and can be used in power engineering in the manufacture of welded collector blocks used in cooling systems of power transformer cases.

It is known, for example, a device for welding flat panels in sections of two or three panels by circumferential contact welding to obtain a continuous tight seam (see article IP Kostenko, VG Matskevich. "Equipment for continuous combined molding of steel panel products ”in the journal“ Forging and stamping production ”, No. 7, 1986, p.25-27). However, this method is difficult to perform, and if the number of flat panels included in the block is more than three, it is impossible.

The most common device for welding panels with a collector pipe is also known, in which two welding units are moved to the panels assembled with a gap on both sides, which collector pipes are pressed in the area of the panel mouths and holding the collector pipes, they automatically weld the necks along the contour to the pipe (see ., for example, the technical and commercial proposal of the company "Heinrich Georg GMBH" E-37116, 1988, drawing No. 0-01017 / 3 "Entwurf fuer Radiatoren, -Herstellungsanlage).

However, the use of automatic welding with welds with different orientations of the welding torch involves the use of rather sophisticated tracking devices when the torch is directed along the weld and precise adjustment of the welding current during the welding process depending on the spatial position of the welding torch. Failure in the welding mode or the tracking mode often leads to the rejection of welds and necessitates the correction of defective welds by manual welding, which reduces the overall production productivity of collector blocks and cases of power transformers as a whole. Welding devices of this type are metal consuming and difficult to operate.

Increasing the production of transformers in sealed cases with flat mounted coolers in the form of panels connected by two collector pipes requires simplification of the design of welding devices and systems for monitoring the direction of the seam.

The technical result in the present invention is to simplify welding techniques and design of welding devices with an increase in the quality of welds and increase productivity in the production of manifold blocks.

This result can be obtained if panels with neck necks are used in the form of collars, the inner diameter of the semicircle of which would correspond to the outer diameter of the collector pipe, and the edges of the collars were parallel to the lateral planes of the panels. The height of the collar should not exceed half the gap between the flanged neck of the panels when assembling them on the manifold pipe. The collar-shaped neck also facilitates the assembly of panels into welding manifolds for welding.

The technical result with the achievement of the above effect is ensured by the fact that when welding the necks of flat panels to the collector pipe, which includes pressing the collars of the necks of the collector pipes and holding them during welding, positioning the welding torch relative to the seams and welding, first half of all ring seams and the longitudinal seam are welded pipes on both sides of the manifold block, and then the manifold block is turned 180 ° and the second halves of the circumferential seams and the longitudinal seam on the pipes are welded, the circumferential seams are made They overlap the ends of the seams, and the longitudinal seams are welded with transverse oscillation of the torches, while the device for welding the collars of flat panels to the collector pipe contains two manipulators mounted on a common frame with the ability to move along the frame on the carriages from the drives and movement limiters equipped with welding torches with movement mechanisms, as well as a receiving table with screw clamps, guides and a lateral movement drive, a rotation drive is installed inside one of the manipulators, and inside the other is equipped with a spring preload mechanism, while both manipulators are equipped with grips in the form of double prisms placed above the axis of the collector pipes mounted on the receiving table, and welding torches are located on guides made in the form of gear segments connected to rotation drives, and the guides are fixed on carriages with drives of longitudinal movement, having stops to limit the stroke of the welding torches when feeding them to the manifold pipe.

The inventive method of welding flat panels with a collector pipe and a device for its implementation are illustrated by drawings.

Figure 1 schematically shows a device for welding the necks of flat panels to the collector pipes with removed grippers on the left manipulator.

Figure 2 schematically shows a top view of a device for welding the necks of flat panels to the manifold pipes in the position of the beginning of welding of the first neck collar.

The inventive method is as follows.

Flat panels 1 are assembled with two collector pipes 2 on a special stand in the collector blocks 3, laying piece by piece with a gap between the edges of the collars of adjacent panels. The collector blocks 3 can have from 4 to 24 flat panels 1. The collector pipes 2 are pressed against the collars of the panels from two sides and the collector block 3 fixed in the set position is then transferred to welding.

To perform the seams, welding is used in a shielding gas medium with a consumable electrode in the form of a wire or with a non-consumable electrode with filler wire feeding into the arc zone. When making fillet welds, the welding torch is guided in the middle of the gap between adjacent panels, leaning on the collector pipe, and the collector pipe serves as a support when welding longitudinal welds.

The optimum gap between the edges of adjacent collars is a distance of 3 mm, with a decrease in the gap to 1 mm, incomplete penetration sections may appear, and with an increase in the gap above 3 mm to 5 mm, transverse oscillation of the welding torch will be required to simultaneously fuse the two collars with the collector pipe. Since all welds are lapped and are performed on a pipe with a wall with a thickness of more than 5 mm, forced modes with increased welding currents at higher speeds can be used to speed up the welding process.

The inventive method is as follows. First, half of all the circular seams and the longitudinal seam of the neck collars of the flat panels 1 are welded on the pipes 2 on both sides of the collector block 3, and then the collector block is turned 180 ° and the second halves of the circular seams and the longitudinal seam are welded on the pipes 2, while the ring seams for the reliability of the penetration is performed with overlapping the ends of the seams, and longitudinal seams, since the edges of the collars during stamping do not have strict geometric dimensions, are welded with transverse oscillation of the burners.

The device for welding the necks of the panels 1 to the collector pipes 2 contains two manipulators 4 and 5 mounted on a common frame 6 with the ability to move along the frame on the carriages 7 and 8 from the drives 9 and 10, equipped with welding torches 11 with movement mechanisms 12, as well as a receiving a table 13 with screw clamps 14, guides 15 and a lateral movement drive 16, a rotation drive 17 is installed inside the manipulator 4, and a spring clamping mechanism 18 is mounted inside the manipulator 5, while both manipulators are equipped with double grippers ЗМ 19, located above the axis of the pipes 2 of the collector blocks 3, mounted on the receiving table 13, the welding torches 11 are located on the guides made in the form of gear segments 20 connected by movement mechanisms 12 to the rotation drives 21. The guides 20 are mounted on carriages 22 with longitudinal drives displacements 23 having stops 24 to limit the stroke of the carriages 22 of the welding torches 11 when they are fed to the collector pipes 2. The receiving table 13 has two holes 25 located in the center and used to center the collector blocks 4 when giving them to the assembly through the same opening 25 manifold blocks 3 is secured to the receiving table 13 with two screw clamps 14.

A device for welding the necks of panels to the collector pipes works as follows.

The assembled collector block 3 is mounted on the receiving table 13 and fixed with screw clamps 14, then the table 13 with the collector block 3 is moved at an increased speed so that the welding position of the extreme panel 1 approximately coincides with the axis of the welding torches 11. The manipulators 4 and 5 are moved to the collector block 3 so that the prismatic jaws 19 are approximately 50 mm from the collector pipes 2. Using corrections, the welding torches 11 are set exactly where necessary for welding, if necessary, the drives 23 of the carriages 22 are moved forward units until the stops 24 contact with the collector pipes 2 and include welding current, welding wire feed, rotation drives 21 and weld the halves of the first annular seams on both sides of the collector block 3. After the welding torches 11 return to the initial position and the carriages 22 to the intermediate position the table 13 is automatically shifted by a distance equal to the gap between the first and second panels 1 (45 mm), then turn on the drives 23 of the carriages 22 forward to contact of the stops 24 with the collector pipes 2 and turn on the welding current, the supply of welding wire locks, rotation drives 21 and weld half of the second annular seams. Thus, all halves of the neck of the flat panels 1 included in the manifold block are sequentially welded. After welding the last ring joint and the welding torches 11 return to their original position, the device is ready to make a longitudinal weld for welding the edges of the neck collars of the panels 1 to the collector pipes 2 Include the welding current, the supply of the welding wire with transverse vibrations of the welding torches 11, the drive 16 of the receiving table 13 and weld the longitudinal seams on both sides of the collector block 3.

To weld the collars of the necks of the flat panels 1 to the collector pipes 2, on the other hand, the collector block 3 must be rotated 180 °. In this case, the following operations are performed sequentially:

- carriages 22 of the welding torches 11 by the actuators 23 are diverted from the manifold pipes 2 to the extreme positions;

- the receiving table 13 is moved by the drive 16 to the middle position so that the middle of the collector block 3 is located on the axis of the manipulators 4 and 5;

- release the screw clamps 14 of the receiving table 13, freeing the manifold block 3 from fixing;

- the manipulators 4 and 5 at a slow speed are moved by the drives 9 and 10 of the carriages 7 and 8 until they come into contact with the collector pipes 2 and then until the pipes 2 are completely in contact with the prismatic grippers 19, while the collector block 3 is raised above the receiving table 13 due to the installation of prismatic grippers 19 above the axes of the collecting pipes 2, forming the necessary gap for moving the table 13;

- the receiving table 13 is moved by the drive 16 to the extreme position, thereby ensuring unobstructed rotation of the collector block 3;

- turn on the rotation drive 17 of the manipulator 5 and rotate the collector block 3 through 180 °, all the distortions arising during rotation dampen the spring mechanism of the preload 18 of the manipulator 6;

- move the receiving table 13 with the drive 16 to the position required for welding the half of the first annular seam, manipulators 4 and 5 are moved apart by the drives 9 and 10 of the carriages 7 and 8, while the collector block 3 is lowered onto the receiving table 13;

- fix the collector block 3 on the receiving table 13 with screw clamps 14.

After that, the device is ready for welding the collars of the necks of the flat panels 1 to the collector pipes 2 on the other side of the collector block 3 with the execution of operations in the sequence similar to operations for welding the collars on the first side.

After welding, the collector block 3 is removed from the receiving table 13 and transported to perform inspection and inspection of welds.

Thus, the application of the proposed method and device for welding the necks of flat panels to the collector pipe allows you to:

- increase welding performance in the manufacture of manifold blocks through the use of forced modes of welding at high welding currents;

- while receiving reliable welds without burn-throughs, eliminating the need to fix defects by manual welding;

- to simplify the tracking system for the movement of the welding torch, as the basis for the direction of the torch are the lateral planes of adjacent panels and forming the manifold pipe;

- facilitate visual control of the welding process and inspection control of the appearance of the welds.

Claims (2)

1. A method of welding collector pipes to the necks of flat panels, including assembling flat panels with collector pipes into collector blocks, pressing the collector pipes to the collars of the necks of flat panels, fixing in a predetermined position and welding, characterized in that at first half of all the circular welds and longitudinal are welded the seam of the collars of the necks of the flat panels on the pipes on both sides of the manifold block, and then the manifold block is turned 180 ° and the second halves of the circumferential seams and the longitudinal seam on the pipes are welded, at ohm circumferential welds performed with overlapping ends of the seams and the longitudinal seams are welded to the transverse oscillation of burners. 2. A device for welding manifold pipes to the necks of flat panels, containing a frame mounted on it with the possibility of moving along it two manipulators on drive carriages, equipped with welding torches with movement mechanisms, a receiving table with a lateral movement drive, with screw clamps and guides, with In this case, a rotation drive is installed inside one of the manipulators, and a spring pressing mechanism is mounted inside the other, both manipulators are equipped with grips in the form of double prisms, welding torches p found on the rear on the guides made in the form of toothed segments connected to the rotational displacement mechanisms and actuators mounted on the carriages with the longitudinal displacement drives and stops for limiting the stroke of the carriages when filing the welding torches to the collecting pipe.

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