SU402441A1 - CONTACT JOINT WELDING MACHINE - Google Patents

Description

This invention relates to resistance butt welding equipment.

A large number of double-flange cast-iron pipes is required for the chemical industry and many other industries. Until the present, his time, such pipes were cast into earth forms. In this case, the pipes were of poor quality, since with this method the difference in thickness, the inclusions of non-metallic impurities, etc. are inevitable. Centrifugal casting is more progressive, but relatively simple equipment can be used only when casting pipes with a single flange.

For the casting of a pipe with two flanges, the equipment for centrifugal casting is very complicated, since it is necessary to make a split chill mold.

Known butt welding machines are known. However, on these machines it is impossible to weld cast-iron-thin-walled pipes, since such pipes cannot be clamped with the required force, and also to create sufficient pressure to reliably supply current without destroying the pipe wall.

In order to improve the quality and increase productivity, when welding thin-walled cast-iron pipes in the proposed machine, the closed caliber of each contact-clamping mechanism is made with the STEM.IM from the upper half-cylinder, which interacts with the guide rods, and the lower part, which is divided along the axis of the welded pipes to be two rotary the nipple flaps, hinged on the upper half-cylinder and connected to the housing of the hydraulic cylinder by means of cables, the stem of which is fixed on the upper half-cylinder, gauge but. Each part of the caliber of contact-clamping mechanisms is equipped with established but circumferences with the possibility of adjusting in the radial direction by self-adjusting spring-loaded prnzh-immy.

In order to combine fasteners in the flanges of the pipes being welded in the manufacture of two-flange pipes from single-flange, OTaHBaeNibix by centrifugal method, the machine is equipped with centralizers-and made in the form of rings installed rotatably under the action of the actuator against the stop and fitted with spring fingers interacting with holes pipe flanges.

To eliminate heavy manual work on the installation of billets and the removal of pipes, the welding machine is equipped with a feeder. The feeder provides the following operations: receiving and stopping blanks, rolling down from the roller table, feeding blanks into

the machine to the level of welding and. the output of the finished pipe initially from the contact-clamping devices, and then from the machine.

FIG. I shows the proposed machine; in fig. 2 is a section along A-A in FIG. one; in fig. 3 is a section along BB in FIG. 2; in fig. 4 is a b-b cut-off in FIG. 2; in fig. 5 is an enlarged drawing of the longitudinal section of the clamping mechanism; in fig. 6 - section centralizer; pas figs. 7 is the same, the section along GGD in FIG. 6

The machine consists of the following main components and parts: the bed 1, on which the stationary contact-clamping mechanism 2, the movable contact-clamping mechanism 3, the cylinder 4 of reflow and draft, the centralizers 5 and the pipe feed mechanism 6 are placed.

The bed 1 is a welded metal structure, on which the rear and anterior pillars 7 are rigidly connected by two horizontal guide rods 8. A fixed contact-clamping mechanism 2 and, with the possibility of longitudinal movement, a movable contact-clamping mechanism 3 are rigidly fixed to the rods. Dvilsenie on a movable clamp is transmitted through a transverse beam 9 (Fig. 4) from the cylinder 4 drive flashing and sludge, the rod of which is fixed on the rear pillar 7. At the same time, the sludge force is transmitted to the butt weld through the insert 10 or without it (the insert is used only when welding shortened pipes) and support P.

The design of the movable and stationary contact-clamping mechanism is similar, therefore only the immobile mechanism 2 is described.

The contact-clamping mechanism consists of the upper half-cylinder 12 (Fig. 2) mounted on the guide rods 8. The lower part of the mechanism is formed by two movable half-ring 13 and 14 flaps that can rotate around the axes 15. The flaps have lugs 16 which are 17 gages a cylinder 18, the rod 19 of which is fixed on the upper half of the mechanism 12.

The inner surface of the clamping mechanisms is provided with clamps 20 located radially and along the axis of the mechanism, having the ability to move to the center and from the center of the mechanism. The clamps in the lower part contain the springs 21, and the five clamp 22 can be self-aligning on the ball joint 23.

In the front part of the contact-clamping mechanism, contact jaws 24 are located, independently spring-loaded relative to the body and having the possibility of adjusting their position relative to the pipe body. A current is applied to each sponge and a help of a flexible sheath from the welding transformer 25. The pipe feeder mechanism is a knife carrying plugs 26 on which the pipe rests. The knife is hingedly connected to the bed and provided with a drive for lowering and raising. Welded single-flange pipes are located on an inclined table 27 having guide wiring 28 for flanges 5 (depending on the length of the blanks). Position 29 marked weldable pipes.

The pipe feed mechanism has three fixed positions: the average when one of the projections of the fork protrudes from the inclined table.

10 27 (Fig. 2) - rolling of the blanks stops; top - blanks are fed into contact-clamping mechanisms; at the bottom — the forks are fully recessed in the table — the welded pipe is drained from the inclined table.

The centralizer 5 is a ring 30, which can rotate around the inserts 10 or the supports And under the action of the actuator cylinder, the housing 31 of which is hinged (rotated) with the aid of the tool holder 32 on the insert 10 or the support M, and the stem 33 is hinged on ring 30. There is a slot 34 for mounting bracket 32 in ring 30.

The ring of the centralizer 5 has two positions, which are fixed by the stop of the piston in the cylinder head 18: gripping the pipe and setting it to the welding position. In the centralizer ring

0, there is a spring-loaded pin 35, which fits into the fastening hole of the pipe flange. The work of the welding machine is as follows.

5 From the rack, blanks are fed to the inclined table 27. The blanks, rolling down, are roughly oriented with flanges using the wiring 28 and are stopped by the projection of the fork 26 (the fork is in the middle position).

During the operation of the cylinder 18, the shutters 13, 14 of the contact-clamping mechanisms are opened, then, through the cylinder, the knife of the feeder is lifted together with two tube blanks lying on the forks of the latter.

5 Thus, the blanks are fed to the welding line.

The drives of the centralizer mechanisms are turned on, and the workpieces are located coaxially with their holes in the flanges. Oil is delivered to

0, I enter the cavity of the cylinder 18 and the flaps 13, 14 close, centering against each other the ends of the pipes. With the aid of a hydrolysis unit, oil is fed into the reflowing and sludge cylinder, the welding transformer is turned on, and the pipe is welded. After welding, the flaps are re-opened, and the knife of the feeder is lowered with the pipe to the extreme position with the same calculation so that the protrusions of the fork are fully located below the surface of the table. The finished tube, under its own weight, rolls out of the mashina onto a roller table. After that, the knife of the feeder is placed in the middle position, the forks are cut off by two successive blanks, and

The machine is ready for the next welding cycle.

Subject invention

Claims (3)

1. Machine for resistance butt welding, containing guide rods with movable And fixed contact-clamping mechanisms, made in the form of closed gauges associated with a clamping hydraulic cylinder, characterized in that, in order to improve quality and increase productivity, mainly when welding thin-walled cast-iron pipes, a closed caliber of each contact-clamping mechanism is made up of the upper half-cylinder, which interacts with the guide rods, and the lower part, which is divided along the axis of welding s on two rotary pipes semiring flaps scharnirno ustanovlennte on the upper half-cylinder and associated Jun & s thrust with a clamping cylinder housing, the stock of which is fixed on the upper caliber semi-cylinder. 2. The machine according to claim 1, characterized in that each part of the caliber of the contact-clamping mechanisms equipped with circumferentially adjustable p radial direction with self-adjusting spring-loaded push-on clamps. 3. The machine according to claim 1, characterized in that, in order to align the mounting holes in The flanges of the pipes being welded for the manufacture of double-flange pipes from single-flange pipes, cast by the centrifugal method, are equipped with centralizers made in the form of rings installed rotatably under the action of the actuator against the stop and provided with spring-loaded fingers that interact with the holes in the flanges of the pipes. pzTtai / 21 25 Phage 2 35 70 11 9 FIG. 4 7 w 2b 13 I.i four Th