SU1337216A1 - Machine for resistance butt welding - Google Patents

Description

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The invention relates to equipment for contact butt welding of annular pipe joints in the conditions of construction of main pipelines.

A known machine for contact butt welding of pipes l, the difference of which is that a flange slider is placed with the possibility of longitudinal movement, interacting by means of projections with rotary levers, carrying support rollers, and by means of a flange with clamping rods -Mounted on the machine body. The gland rods are always under the influence of springs. The force of the springs is chosen depending on the weight of the structure. In the event that one of the rollers received a larger radial movement relative to the others, for example, if the inner surface of the pipe is present, this is transmitted through the roller snarl to the slider, which transfers this pressure to the other rollers, self-centering takes place and the machine is constantly held along the pipe axis.

However, since the rollers were initially opened to a size that exceeded the possible upper limit of the diameter of the pipe, it is difficult to insert the machine into the pipeline and also to attach the subsequent pipe to be welded to the machine. To do this, it is necessary to overcome the force of the springs that unclench the rollers to the outermost position. ,

The closest butt welding machine of pipes 2, consisting of a central rod, is closest to the proposed one. On KOTopofi there are stationary and movable clamping mechanisms that interact with conductive shoes connected by flexible terminals with the secondary winding of a transformer using hydraulic actuators.

The mechanism of melting and sludge is made in the form of a supporting disk rigidly fastened to a rod that carries hydraulic cylinders of the smelting and sludge, the rods of which are connected to the casing of the mobile mechanism h; 1c. The machine also contains centering expansion rollers, which are individually driven in parallel;

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in relation to the axis of the machine. The expansion rollers are located on one end of the double-arm levers, and the other end is in contact with. a common disk, which, moving along the rod with the help of special hydraulic cylinders, rotates the rollers relative to the axis of attachment of the lever, which impedes the possibility of wiggling, and thereby approximates or removes the rollers relative to the inner surface of the pipe.

Thus, using this design of the machine centering mechanism with respect to the pipe axis, the process of positioning the machine in a pipe or nozzle. It does not pose a problem for the next welded pipe. However, the presence of a special centering mechanism and an individual drive to move the centering rollers complicates the design of the machine, increases its weight, and also complicates the management and automation of the welding process, since additional operations appear in the process of pipe assembly and welding,

To improve the manufacturability of the machine by simplifying the design and reducing its mass in a known machine for butt-welding of pipes, comprising a housing, a central rod, a movable and stationary clamping mechanism, a reflow mechanism and a draft, whose housings are mounted on the -central rod that can be moved along it with the help of individual hydraulic actuators, as well as centering mechanisms, made in the form of hinged mechanisms in the housings of the mechanisms clamp two shoulders, at one end of which the lips The centering rollers, the body of the mask and the body of the reflowing mechanism and the sediments are equipped with rigid stops, and the case of the clamping mechanisms - with spring-loaded stops, with each double-arm lever installed so that one side of its free end can interact with a hard stop and the opposite side with spring stop.

The drawing shows a machine for resistance butt welding of pipes, a general view.

A butt welding machine contains a machine body, which is a central rod 1 and a support fixed on it.

Other discs 2 and 3. The support disc 2 is articulated with the fixed mechanism A and clamped by the lever system. The rods of 5 cylinders of the fixed mechanism 4 are rigidly fixed on it. The housings of these cylinders are in turn secured in the casing 6 of a fixed clamping mechanism.

At the other end of the rod 1 on the supporting disk 3, the cylinder bodies of the reflow and draft mechanism are firmly fixed. I JTOKH 7 of these cylinders are fixed in the housing 8 of the reflow and draft mechanism. A movable mechanism 9 is clamped to the housing 8;

In the housing 10, the cylinder bodies of the movable mechanism are rigidly clamped, and the rods 11 are respectively fixed in the housing 8 of the melting and sludge mechanism.

In the slots of the bodies 6 and 10, the fixed and movable mechanisms of clamping are installed with the possibility of rocking the two shoulders, the levers 12 and 13, respectively. Centering rollers 14 and 15 are mounted at one end of each two-armed lever, which interact with the inner surface of the welded pipes 16 and 17. The other end of the two-armed lever can be in contact with a rigid stop 18 or 19 fixed to the supporting disk 2 and the mechanism 8 melting and precipitation.

The opposite side of the same end of the two-arm lever interacts with stops 20 and 21, springs 22 and 23, spring-loaded, respectively, mounted in the housings 6 and 10 of the fixed and movable clamping mechanisms.

The welding transformer 24 is located along the central axis of the machine, the outputs of the secondary winding of which are connected by means of flexible jumpers to the current-carrying shoes 25 and 26.

The machine also has a pump station 27, a drive 28 for moving the machine with the drive rollers 29 and a device for removing the grat.

The machine works as follows.

The pipes are fed in a known manner.

The clamping of the ends of the pipes to be welded is performed separately, the operation of both clamping mechanisms is similar.

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When the working fluid is supplied to the cavity A of the cylinder of the stationary mechanism 4, the piston with the rod 5 remains in place, and the housing 6 of the stationary: the clamping mechanism in which the cylinder body is fixed, moving along the central rod 1 using a lever system, clamps the pipe 16 with current-carrying shoes 25.

The fixed anvil 20, resting against one end of a two-armed lever 12 pivotally mounted on the housing 6, removes the other end of the lever with the centering roller 14 from the inner surface of the pipe. Thus, the machine is clamped by current-carrying shoes and centered about the axis of the pipeline.

The welding process is as follows.

In the process of reflowing and deposition, the stems of the reflowing cylinders 7 and the precipitates move the body 8 of the reflow mechanism and the precipitates with the movable clamping mechanism 9 clamped and the tube 17 clamped by it.

After welding, the working fluid is supplied to the opposite working cavities of the cylinders and mechanisms of the machine.

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In this case, the bodies 6 and 10 of the fixed and movable mechanisms 4 and 9 are clamped, moving along the central rod 1 in the direction of the supporting disk 2 and the fixed case 8 of the reflow mechanism and the draft, free the welded pipes from clamping them with current-carrying shoes and at the same time move the single arm levers 12 and 13 until they are in contact with the rigid stops 18 and 19. Continuing to move along the rod, hulls 6 and 10 press down the surface of the two shoulders levers and the levers 12 and 13 rotate around their axes, lower and press The other end of the two-armed lever with the centering rollers 14 and 15 to the inner surface of pipes 16 and 17. Thus, the current-carrying shoes 25 and 26 using cylinders of fixed and movable clamping mechanisms release the pipes already welded from being clamped, the machine at the same time however, the cylinders remain centered with two shoulders with respect to the axis of the pipeline.

When inserting a new subsequent pipe to be welded, it is sufficient to apply a small pressure into the cavity A of the cylinder and the centering rollers 15 are removed to the center relative to the internal diameter of the pipe being injected. She slips easily onto the car. Then again the centering rollers 15 are lowered to the inner surface of the pipe and continue to support this end of the welding machine in the centered position,

The use of double-shouldered levers with centering rollers mounted on the housings of the clamping mechanisms allows all the time to maintain the axis of the in-pipe welding machine along the axis of the pipeline without additional drives and centering mechanisms while using the reverse idle stroke of the cylinders as they move to their original position.

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In the case of a change in the pipe diameter or a change in the wall thickness of the pipe, by adjusting the force of the springs 22 and 23, the machine also remains in the center of the welded pipe.

 Thus, in comparison with the known design, the application of the proposed design of the mechanisms of clamping with centering rollers significantly increases the technological capabilities of the machine, this simplifies the design, reduces the number of nodes, and consequently, reduces the mass of the machine and its energy costs.

The features of the proposed machine improve the centering conditions and the quality of welding of pipes with a large tolerance both in diameter and taper, thereby expanding the technological capabilities of in-line welding machines used in welding main pipelines.

Claims (1)

Raspberry for contact welding of pipes, comprising a housing, a central rod, movable and fixed clamping mechanisms, a flashing and upsetting mechanism, the housings of which are mounted on the central rod with the possibility of moving along it using individual hydraulic drives, as well as centering mechanisms made in the form of articulated in the cases of two-arm clamping mechanisms, on one end of which centering rollers are installed, characterized in that, in order to increase the manufacturability of the machine by simplifying To reduce the weight of the structure, the machine body and the case of the reflow and precipitation mechanism are equipped with rigid stops, and the bodies of the clamping mechanisms are equipped with spring-loaded stops, and each two-arm lever is installed with the possibility of interaction of one side of its free end with a hard stop, and the opposite side with spring-loaded emphasis. SU. „. 13372 1 13