RU2344011C2 - Mill for assembly and welding of longitudinal welded tubes - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention refers to tube welding, particularly to welding tubes of bigger diameter out of tube stocks of finite length. The mill incorporates incoming roller beds assembled in the process sequence, an assembling device, a chain pusher with a movable stop, a welding facility and an outgoing roller bed. A transport roller bed is arranged parallel to the axis of the mill; also the transport roller bed is connected with incoming and outgoing roller beds by means of transfer cars designed to travel perpendicular to the axis of the mill. The mill is equipped with a transfer facility of gantry type with a device for gripping, lifting and transfer of a tube stock; the said device connects the transport roller bed with the chain pusher. A lowerable support with a rotating knife is installed behind the chain pusher. The movable stop of the chain pusher is designed both for pair assembly and for pushing tube stocks of double-seam and single seam welded tubes.

EFFECT: upgraded quality of assembly and welding both double-seam and single seam tubes of bigger diameter from tube stocks.

2 cl, 10 dwg

Description

The invention relates to pipe welding production, and more specifically to the production of large diameter electric welded pipes from billets of finite length.

A known mill for the assembly and welding of longitudinal pipes (see AS USSR No. 254452, M. cl. B21C 37/08, decl. 10.07.67, publ. 07.09.81), containing installed in the technological sequence input roller table, assembly device, chain pusher with an emphasis, pulling stand, welding device and output roller table.

A disadvantage of the known mill is the narrow technological capabilities. On its equipment there is no possibility of welding the second longitudinal seam of two-seam pipes, as well as assembling and welding the joint of single-seam pipes.

Other disadvantages of the mill are the low quality of assembly and welding of billet pipe billets due to the overlap of the edges of the assembled pipe billets and the mutual displacement of their longitudinal edges in the cross section during their axial movement, due to the absence of an internal roller mandrel.

Of the known mills for assembly and welding of longitudinal pipes, the closest in technical essence is the mill described in the book "Improving the production of welded pipes" V.A. Rymov et al., M .: Metallurgy, 1983, pp. 270-271.

This mill for assembly and welding of longitudinal pipes contains the input roller tables installed in the technological sequence, an assembly device, a chain pusher with an emphasis, a device for welding and an output roller table. The device for welding includes pulling and welding stands, mandrel and welding heads. The mandrel is located inside the pipe along the entire mill and is equipped with roller clips on the sections of the welding stands and horizontal rolls in the plane of the pulling stands.

A disadvantage of the known design of the mill for the assembly and welding of longitudinal pipes is the narrow technological capabilities due to the inability to assemble and weld a second longitudinal seam on it, as well as the assembly and welding of single-seam pipes.

The presence in the mill of three welding stands and six simultaneously working welding heads increases its material and energy consumption. Six simultaneously working heads do not provide the required level of reliability, as well as the quality of welded joints in the overlap zone.

For the assembly and welding of the second joint of two-seam pipes and the joint of single-seam welded pipes, an additional production area is required to accommodate a similar mill, excluding from its equipment only the assembly device of paired billets.

The objective of the present invention is to provide a mill for the assembly and welding of longitudinal pipes with wide technological capabilities and allowing high-quality assembly and welding of both two-seam and single-seam welded pipes of large diameter from workpieces of finite length.

The next objective of the invention is to reduce the cost of manufacture and operation of the equipment of the mill, which, in the first place, is associated with its material and energy consumption and occupied production area.

The task is achieved in that the mill for assembly and welding of longitudinal pipes containing the input roller tables installed in the technological sequence, an assembly device, a chain pusher with a movable stop, a welding device and an output roller table, according to the invention, is equipped with a transport roller table parallel to the axis of the mill, installed with the ability to move perpendicular to the axis of the mill with transfer trolleys connecting the transport roller table with the input and output roller tables, and transmitted a portal-type device with means for gripping, lifting and transferring the tube stock, connecting the conveyor roller chain with a chain pusher, and also a lowering stop with a rotating knife placed behind the chain pusher, and the movable stop of the chain pusher is made with the possibility of both pair assembly and pushing of the tube billet and single-seam welded pipe blanks. In addition, the movable stop of the chain pusher is pivotally mounted and made in the form of a housing carrying side and end elements for holding the longitudinal and end edges of the pipe billet during pair assembly and pushing and having a freely suspended stop in front and a hole for placement motionless in the lower part mounted on the pusher cantilever pin with a roller.

Such a constructive implementation of the mill for the assembly and welding of longitudinal pipes will allow high-quality assembly and welding of both double-seam and single-seam large-diameter pipes from workpieces of finite length and, thereby, expand its technological capabilities. In addition, the proposed mill has smaller dimensions and material and energy consumption.

This is achieved by supplying the mill with a transport roller table parallel to the axis of the mill, transfer trolleys and a portal type transmission device for gripping, lifting and transferring the tube stock perpendicular to the axis of the mill, which allow the tube blank of a two-seam pipe for assembly and welding to be fed back to the mill axis the second seam, as well as the forward stroke of the billet of a single-seam pipe.

Due to the constructive implementation of the emphasis of the chain pusher with side and end elements, high-quality assembly of two halves of the pipe billet is ensured and the assembled pipe billets of the two-seam pipe are pushed during assembly and welding of the first seam into the pulling stands.

The implementation of the movable stop in the form of a housing carrying a freely suspended emphasis in front and the presence in the lower part of the housing of an opening for mounting a cantilever pin with a roller fixed on the pusher makes it possible to assemble and weld both the second joint of two-seam pipes and assemble and weld the joint single-seam pipes.

Due to the placement of a lowering stop with a rotating knife behind the chain pusher when pushing the assembled pipe billets of two-seam pipes (when welding the first seam) into the pulling stands, the burrs of their mechanically machined longitudinal edges are completely eliminated.

To explain the invention, a specific embodiment of the invention is provided below with reference to the accompanying drawings, in which:

figure 1 shows a mill for the assembly and welding of longitudinal pipes, a plan view;

figure 2 is the same, side view of the lowering stop with a rotating knife and a chain pusher;

figure 3 - gantry type transmission device with a means of gripping, lifting and transmitting the tube stock;

figure 4 is a view along arrow a in figure 2;

figure 3 is a view along arrow B in figure 2;

figure 6 - movable emphasis pusher with a freely suspended emphasis and a cantilever pin with a roller;

Fig.7 is a view In Fig.6;

on Fig - section GG in Fig.6;

figure 9 is a section DD in figure 1;

figure 10 is an assembly device, front view.

The mill for assembly and welding of longitudinal pipes contains the input roller table 1 installed in the technological sequence with stationary stops 2, an assembly device 3, a chain pusher 4 with a movable stop and supporting rollers 5, a welding device and an output roller table 6. A transport roller table 7 is located parallel to the axis of the mill , which is connected with input 1 and output 6 live rolls by transfer trolleys 8, 9, mounted with the ability to move perpendicular to the axis of the mill and equipped with transport rollers 10.

The mill is equipped with a portal-type transmission device 11 with means 12 for gripping, lifting and transmitting a pipe billet connecting the conveyor roller 7 with a chain pusher 4. A chain stop 13 is installed behind the chain pusher with a rotating knife 14. A cantilever pin 15 is fixedly mounted on the chain pusher 4 with 15 sec roller 16.

The movable stop of the chain pusher 4 is pivotally mounted and is made in the form of a housing 17 carrying side 18 and end 19 elements for holding the longitudinal and end edges of the pipe billet during pair assembly and pushing. In addition, the said housing has a freely suspended stop in front 20. An opening 21 is made in the lower part of the housing 17 to accommodate the cantilever pin 15 with the roller 16.

The assembly device 3 is installed between the input roller tables 1 and is made in the form of two transmissions 22, 23 with rotation drives 24, for example pneumatic or hydraulic cylinders, and levers 25, equipped with installation 26 and dividing 27 rollers.

The welding device comprises an input 29 mounted on a common frame 28, pulling 30 and assembly and welding 31 stands. A cantilever inner roller mandrel 32 is fixed on the input stand 29, which passes through all the roll gauges of the input 29 and the assembly-welding stand 31, providing a predetermined position of the edges of the tube billet. Inside stand 29, at least one pair of radially adjustable horizontal 33 and at least one pair of radially adjustable vertical 34 non-driven rolls are mounted.

In the assembly and welding stand 31, at least six cages 35 with rollers 36 are mounted with the possibility of vertical movement. Supporting rollers 37 are installed in the lower part of the cage, and a welding machine 38 is mounted in its upper part, in the recess.

Behind the assembly and welding stand 31 are hoisting and turning rollers 39.

The mill works as follows.

Two semi-cylindrical blanks 40 are simultaneously transported by the input roller tables 1 to the stationary stops 2 and stop.

The actuators 24 of the assembly device 3 are turned on, the levers 25 are turned, and the semi-cylindrical workpieces 40 are turned by levers to the end of their ends in the upper part in the dividing rollers 27 of the levers.

The drive of the chain pusher 4 is turned on and the workpieces are guided into the input stand 29 by the stop of the pusher 4, while the lowering stop 13 with the rotary knife 14 are raised, which ensures high-quality assembly of semi-cylindrical workpieces and helps to maintain a gap between the lower edges of the half-cylinders without damaging the edges.

Further, the workpieces enter the inlet 29 and the pulling stand 30, the rollers 33, 34 of which, together with the rollers 36 placed on the inner mandrel 32, ensure the correct orientation and gradual convergence of the longitudinal edges of the tube blanks. The rollers of the pulling stands located in the same plane together with the rollers of the inner mandrel provide the necessary pulling force to the workpieces, after the stop 13 of the pusher makes a predetermined stroke of the workpieces.

As the cage of the assembly and welding stand 31 is further advanced, the horizontal edges of the paired tube blanks are finally brought together.

The welding machine 38 welds the first technological longitudinal seam (upper ends of the workpieces).

After the rear end of the assembled workpieces approaches the plane passing through the ends of the stationary stops 2, the levers 25 of the assembly device 3 return to their original position. After welding the first longitudinal seam, the stop 13 with the rotary knife 14 is lowered, for example, by a hydraulic cylinder below the pipe billet, and the movable stop of the chain pusher 4, when returning, is additionally moved 200 mm relative to the starting position, with the roller 16 located on the cantilever pin 15, raises the stop 20.

After welding the first longitudinal seam, the pipe billet moves along the output roller table 6 to the area of the lifting and turning rollers 39, with the help of which it is rotated 180 ° and fed to the transverse transfer carriage 9, then it is transferred to the transport roller table 7, which transports it to the area of the transfer device 11 The stop of the front end of the tube stock with an accuracy of ± 25 mm is provided by a photosensor and a slowing down of the roller table speed 7.

The transmission device 11 with the tool 12 captures, raises and moves the tube stock on the axis of the mill and puts it on the support rollers 5 of the pusher 4. In this case, the rotating knife 14 and the stop 13 are omitted. The pusher 4, when moving with its freely suspended and raised emphasis 20, feeds the tube stock to the inlet 29, pulling 30 and assembly-welding 31 stands. Welding of the second longitudinal seam. After that, the pipe is transported using the output roller table 6 and the transfer carriage 9 to the following technological operations.

When assembling and welding single-seam pipes, the workpiece is transferred by means of a cart 8 to the transport roller table 7, which moves it to the area of the transfer device 11. Then, using the transfer device 11, the workpiece of the single-seam pipe, like the pipe workpiece with the first seam of the two-seam pipe welded, is transferred on a chain pusher, with the help of which it is set in the input 29, pulling 30 and assembly-welding 31 stands, where the weld is assembled and welded. The output roller conveyor 6 transports it from the mill line.

The proposed mill for assembly and welding of longitudinal pipes in comparison with the known ones will allow high-quality assembly and welding of both double-seam and single-seam large-diameter pipes from billets of finite length and, thereby, expand its technological capabilities, as well as reduce the footprint and reduce manufacturing cost and operation.

Claims (2)

1. A mill for assembly and welding of longitudinal pipes, comprising input roller tables installed in the technological sequence, an assembly device, a chain pusher with a movable stop, a welding device and an output roller table, characterized in that it has a transport roller table parallel to the axis of the mill, transfer trolleys, installed with the ability to move perpendicular to the axis of the mill and connecting the transport roller table with the input and output roller tables, and the portal type transmission device with ohm for gripping, lifting and transferring the tube billet connecting the transport roller table with a chain pusher, as well as a lowering stop with a rotating knife placed behind the chain pusher, while the movable stop of the chain pusher is made with the possibility of pushing the tube billets of two-seam or single-seam welded pipes. 2. The mill according to claim 1, characterized in that the movable stop of the chain pusher is mounted pivotally and is made in the form of a housing carrying side and end elements for holding the longitudinal and end edges of the pipe billet during pair assembly and pushing and having a freely suspended stop in front, and in the lower part there is an opening for placement of a cantilever pin with a roller motionlessly fixed on the pusher.

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