SU1555084A1 - Machine for butt resistance welding of tubes - Google Patents

Abstract

The invention relates to equipment for contact butt welding of annular pipe joints in the conditions of construction of trunk pipelines of the oil and gas industry. The purpose of the invention is to expand the technological capabilities of the machine. The machine contains a central rod 1 with two supporting discs 2 and 3, movable and fixed clamps of welded pipes with spacer disks 6 and 26, centering elements (CE) and clamping current-carrying shoes. A reflow disk 20 is mounted on the movable clamp concentric with the central rod. CEs 5 and 4 of the movable and fixed clips are fixed with one ends hinged relative to the reflow disc 20 and the support disc 2, respectively. The movable clamp has two shoulders levers 27. At one end of the latter, the centering rollers 31 are fixed, and the other ends are adapted to interact with rigid stops. The movable clamping disc 6 is connected to the supporting disc by means of hydraulic cylinders with housings 24 and 25 mounted on the support 3 and the spacer 26. The hydraulic cylinder rods are mounted coaxially and rigidly connected to the reflow disk 20. CE 4 and 5 are equipped with hollow pads 10 with current-carrying 12 and clamping 11 shoes arranged separately and placed on them. The pads 10 are articulated by the other ends of the cylinders 5 and 4. The beams 16 are articulated on axles 15 in the cavity of the pads with a gap. The earrings 17 of the beams are parallel to each other and connect the beam with the spacer disk 6. The supporting disk 3 of the movable clip is made with a rigid stop 33 in the form of an annular protrusion from the side of the spacer disk 26. The mobile disk of the reflow 20 is installed with a gap relative to the stop 33 of the support disk 3. Each of the CEs is made in the form of two parallel plates. A lever 27 is rotatably mounted between the plates on the axis 29. A stop is placed on the lever arm on the centering roller side so that it can be in contact with the spacer disk. 3 il.

Description

The invention relates to equipment for contact butt welding of annular pipe joints in the conditions of construction of trunk pipelines of the oil and gas industry.

The purpose of the invention is to increase the technological capabilities of the welding machine.

FIG. 1 shows a car, a general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one.

A butt welding machine for pipes comprises a central rod 1, the longitudinal axis of which coincides with the axis of the pipes being welded. At the opposite ends of the rod 1, there are fixed supporting discs 2 and 3. A fixed centering mechanism 3 is clamped near the supporting disc 2, and a movable centering mechanism 5 is clamped near the supporting disc 3. The fixed centering mechanism 4 is clamped in the form of a spacer disk 6 mounted on the central rod 1 with the possibility of movement by means of a hydraulic actuator 7 of movement made in the form of power cylinders symmetrically arranged around the central rod 1, and the body of each of them is fixed rigidly on the spacer disk 6, and the rod 8 is rigidly fixed on the supporting disk 2 on which the centering elements are hinged - clamping levers 9, located evenly and symmetrically relative to the longitudinal

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boom axes 1. The other ends of the clamping levers 9 are hingedly connected each to the hollow block IX), on which the clamping shoe 11 and the current supplying shoe 12 connected by flexible current leads 13 to one of the poles of the transformer 14 are mounted.

On each hollow block 10 with the help of a hinge 14, a beam 16 is installed with the possibility of rocking. On the beam 16, two parallel earrings 17 are hinged, which with their other ends are hingedly connected to the spacer disk 6 of the fixed centering mechanism 4 and clamped.

Another movable mechanism 5 for clamping the pipes to be welded has a similar structure and is characterized in that its centering elements, clamping levers 18, are connected by their ends by means of hinges 19 to the movable reflow disk 20. In this case, the spacer disk of the movable centering mechanism 5 is clamped on the rod 1 with the possibility of longitudinal movement by means of cylinder blocks arranged evenly and symmetrically relative to the longitudinal axis of the central rod 1. Each cylinder block is made in the form of a rod 21 with two pistons 22 located at different ends of the rod and 23, each of which is movably mounted in housings 24 and 25, respectively. The housings 24 of each cylinder block are rigidly fixed in the supporting disk 3, and the housings 25 in the spacer disk 26 of the moving mechanism 5

squeeze. At the same time, the rods of the 21 cylinder blocks are rigidly fixed on the movable reflow disk 20, which is located relative to the supporting disk 3 coaxially with the gap.

The second centering device 2 of the machine is made in the form of a series of double-arm levers, the number of which corresponds to the number of centering elements - clamping levers 18. Each clamping lever 18 is made in the form of two parallel plates 28 (Fig. 2), between which on the axis 29 is fixed with possibility of pumping two shoulders lever 30. At one end of the two shoulders lever 30 of the centering device 27 are fixed so that the centering roller 31 and the stop 32 with the possibility of its contact with the spacer disk 26 of the moving mechanism 5 are clamped . The other end of each double lever of the lever 30 has the ability to interact with a rigid stop 33, which is made on the supporting disc 3 from the side of the moving mechanism 5, and clamp the pipes to be welded.

In a butt welding machine, a pumping station 34 and a machine reworking mechanism 35 are installed along the internal surface of the pipeline with driven rollers 36. The pipeline is indicated by 37, and the pipe is welded by 38.

The operation of the flash butt welding machine is carried out as follows.

The machine for resistance butt welding moves after welding the next joint along the welded pipe - pipeline 37 using the mechanism 35 for moving it. At the same time, the working fluid under pressure is in the cavities D and T of each cylinder block of the hydraulic drive of the movable centering mechanism 5, since the housings 24 and 25 of these cylinders are fixed rigidly on the support 3 and spacer 26 disks. The movable flashing disk 20 with fixed cylinder-type piston rods 21 together with the spacer disk 26 moves towards the supporting disk 3. In this case, the other end of each double-arm lever 30 contacts the anvil 33 of the supporting disk 3. The double-arm lever 3 of the centering mechanism 27 of the turn and 10

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On axis 29, the centering roller 31 contacts the inner surface of the pipeline 37. The machine is centered on the centering rollers 30 and the drive rollers 36 of the transfer mechanism and moves to the next joint, resting on them.

The machine is installed so that the front part of the machine leaves the pipeline 37, and the end of the pipeline is located in the middle between the mechanisms 4 and 5 clamp the welded pipes at the place of the future welded joint.

The power supply cables are disconnected from the machine and the pipe 38 to be welded is put on its front part until it stops at the end of the pipeline 37. After that, the power and control cables are again connected to the machine. Then, in the cavity E of the cylinder blocks of the hydraulic actuator of the movable centering mechanism 5 to clamp the pipes to be welded, the working fluid is supplied under pressure. Since the rods 21 of each cylinder block are rigidly fixed in the movable disc 20

30 housings 24 and 25 are rigidly fixed on the disk 3 and the spacer disk 26, and the piston 22 of the rods 21 is in the extreme position, since in the cavity G the liquid is under pressure, then the spacer disk 26 moves towards the joint and the pipe 37 is clamped movable mechanism 5 is clamped.

Next, the working fluid is supplied to the cavity B under pressure, and the cavity D is connected to the drain. And due to the fact that the centering mechanism 5 is clamped in place and clamps the conduit 37, then the fixed j 3 is moved away from the joint. The ends of the two levers 30 of the centering mechanism ta 27 come out of contact with the platform 33 made on the disk 3, while the centering rollers 31 move away from the inner surface of the pipeline 37 to the central axis up to the stop of the protrusion 32 into the expansion disk 26 of the movable clamping mechanism.

There is no pressure in Cavity B and D; the next spool (not shown) is in neutral. Next, the hydraulic drive 7 of the fixed mechanism 4 is clamped into the cavity.

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working fluid. And since their rods 8 are rigidly fixed on the disk 2, and the housings on the spacer disk 6, the spacer disk 6 moves towards the joint, and the welded pipe 38 is clamped and centered relative to the moving mechanism 5 is clamped. Thus, the machine is clamped and centered from

pipe 37, and the welded pipe 38 is clamped and centered relative to the welding machine.

The clamping of the pipeline 37 and the pipe 38 is performed by means of the clamping shoes 11, and the distribution of the necessary ratio between the clamping and current leads is made by testing the machine by moving the position of the hinge 15 of the beam 16 in the hollow block 10.

When the working fluid is fed into the cavities. C melting and sediment occur in the cylinder blocks. Since the movable clamping mechanism 5 and the fixed clamping mechanism 4 clamp the machine to the pipeline 37 and the welded pipe 38 with the help of clamping shoes 11, the reflow and draft force from the cylinder blocks is transmitted through the machine bar 1 and the fixed mechanism 4 to the welded pipe 38, end in the process of melting and sludge, the pipes 38 are moved towards the end of the pipeline 37 together with the central rod 1 of the machine and the fixed mechanism 4. press.

Welding-fusion occurring and

sludge according to process

procession Pipes welded.

From the cavities E, B, G of all cylinders, the working fluid is discharged and supplied to opposite cavities, all mechanisms returning to the initial position, and the welded pipes are released from being clamped by clamping current-carrying shoes 10.

At the same time, the working fluid under pressure is in the cavities D and G of each cylinder block of the hydraulic drive; the spacer disk 26 together with the movable fusion disk 20 moves towards the support disk 3. The end of each double-arm lever 30

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comes into contact with the protrusion 33 of the supporting disc 3, the two shoulders of the levers 30 of the centering device, turning on the axles, come into contact with

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the inside surface of the conduit 37. The machine is centered on the drive rollers 36 and the centering rollers 31. The welding process is repeated.

With minor irregularities or errors in the pipe that do not affect the quality of welding, due to the presence in the construction of clamping 11 and current-carrying shoes 12 mounted on the hollow block 10 of the movable and stationary mechanisms 5 and 4 clamped, swivel 15 with the beam 16 ensures that the clamping and current-carrying shoes are fully fitted to the inner surface of the pipeline and that energy costs are reduced.

With significant deviations of the welded pipe parameters affecting the quality of welding, choose a relatively small gap And (Fig. 1) between the beam 16 and the body of the swinging hollow block 10, the clamping and current supplying shoes together with the beam 16 and the parallel lugs 17 turn into a hard caliber that rules unacceptable pipe errors and allows welding quality pipe from pipes that, when using other designs of welding machines, have to be rejected.

Due to the presence of the centering mechanism 27, which keeps the welding machine all the time in the centered state, when clamping, no effort is expended to lift the machine to the center, and the machine does not rest on the inner surface of the pipeline along the route.

In addition, the implementation in the movable mechanism 5 of clamping the cylinder blocks whose rods are fixed on a movable disk located with a gap relative to the machine body reduces the length of the machine, since in this case the distance between the piston blocks can be considered as the base of the centering mechanism. cylinders and easier to pass the rounding of the pipeline.

The design features of the proposed machine for resistance butt welding of pipes improve the conditions for centering and, consequently, the quality of welding of pipes with a large tolerance, which expands the technological capabilities of machines for resistance butt welding of pipes located

Claims (1)

Claims $ Butt A contact tube machine comprising a central one with two supporting disks, and moving stationary clamps of welded pipes with spacer disks, welding a movable rod mounted on a rod between the support disks with the possibility of movement, centering elements and clamping current-carrying shoes, between the spacer disk of the movable clamp and the closest to it a support disk concentric to the rod with the ability to move relative to it a fusion disk is installed, the centering elements of the movable and fixed clamps are fixed one ends pivotally relatively respectively. the fusion disk and the supporting disk, in addition, is movable, the clamp is equipped with two shoulders, centering rollers are fixed at one end, and the other are made with the possibility of interaction with hard stops, the spacer disk of the movable clamp is connected to the supporting disk by means of power cylinders, ι A- A whose cases are coaxially and rigidly mounted on the support and spacer discs, and the rods are rigidly connected to the reflow disc, characterized in that, in order to expand the technological capabilities of the machine, the clamps are equipped with hollow blocks, each of which is pivotally connected to the free end of the centering element , beams, each of which is pivotally mounted on an axis in the cavity of the block with a gap, earrings, each two of which are installed parallel to one another and pivotally connected to the beam and the spacer disc, while clamping and current-carrying the feeding shoes are made separately and mounted on the blocks, the hard stop of the movable clamp is made in the form of an annular protrusion on the support disc from the side of the spacer disc, the movable fusion disc is installed with a gap relative to the support of the support disc, each centering element is made in the form of two parallel plates, and between them a two-arm lever is located on the axis with the possibility of rocking, in addition, an emphasis is made on the shoulder of the two-shouldered lever on the roller side to contact the spacer disc. Bv Figure 3