RU129853U1 - LARGE LENGTH DIAMETER TUBE ASSEMBLY AND WELDING MACHINE - Google Patents

Abstract

1. A mill for assembling and welding longitudinal-seam pipes of large diameter of finite length, containing installed in one line means for feeding the tube stock, stand for fixing the mandrel, guide knives, inlet stand, welding stand, welding machine and inner mandrel, characterized in that it is equipped a welding machine moving mechanism comprising a carriage mounted to be movable from the drive on vertical cylindrical guides mounted on the frame and a movable plate mounted on the carriage, on which the welding machine is fixed, while the movable plate has a horizontal movement drive mounted on the carriage. 2. The mill according to claim 1, characterized in that the carriage movement drive and the horizontal movement drive of the movable plate are made in the form of drive kinematic screw-nut pairs.

Description

The utility model relates to pipe welding production, and more specifically to the production of electric-welded straight-seam pipes of large diameter of finite length.

Known universal feedthrough mill for welding pipes and.with. USSR No. 197485, cl. BC21 37/08 claimed 01/27/1966, publ. 06/09/1967, containing means for supplying a tube billet, a welding stand with clamping movable rods, a guide knife. Paired rollers spring-loaded in the cage are placed along the length of the rods, and two stationary rods with rollers are placed in front of the welding stand in the live roll line. To weld pipes to the required size, the welding stand with movable rods is set to the required level using hydraulic cylinders. The pipe billet is set in the welding stand by a Schlepper-pusher with a welding speed. Pipes are welded with a fixed welding head.

The disadvantages of this design are: firstly, a decrease in the quality of the welded seam of the pipe billet due to the lack of lateral adjustment of the electrodes relative to the welded joint. The pipe billet is forcedly fed into the welding stand, the guide knife interacts with the edges of the pipe billet in only one plane. Its twisting occurs during movement and, consequently, the displacement of the seam, which negatively affects the quality of the welded pipe billet. Local lack of weld is formed, which reduces the quality of the weld and requires additional time for welding the weld at the pipe repair site. Secondly, the low maintainability of the mill, it takes a lot of time to dismantle the welding machine. Thirdly, when the mechanisms installed in the welding stand are broken, it is necessary to remove the welding stand from the mill line, this requires complete dismantling of the welding machine, which is installed stationary in the line of the welding stand. This installation operation takes a lot of time, which reduces the performance and maintainability of the equipment.

Known mill for the production of welded straight-line pipes, see.with. USSR No. 1459749, class BC21 37/08 claimed 04/21/87, publ. 02/23/89, containing in one line the means of feeding the tube billet, a crimping roller-roller stand, a vertical guide knife and an arc welding machine with several welding heads in series with transverse correction of the electrodes relative to the joint. The welding machine is fixed motionless on a crimping roller-roll stand.

The disadvantage of this mill design is the reduction in the quality of the weld when welding large diameter pipes with thin walls, this is due to the fact that when assembling the pipe billet in the welding stand, excess edges are formed due to the fact that the pipe billet has a small curved generatrix along the entire length and slight curvature of a different sign at the edges, that is, waviness along the entire length. Exceeding the edges during assembly and welding leads to burn-through and leakage of metal.

The next disadvantage of this design of the mill is the low maintainability of the mill, it takes a lot of time to dismantle the welding machine. The welding machine is fixedly mounted on a crimping roller-roll stand. In case of breakage of the rolls or rollers in the roller-roller stand or transshipment of the roller-roller stand, a complete dismantling of the welding machine will be required. The operation of dismantling, and then mounting the welding machine on a roller-roll stand takes a lot of time and increases the downtime of the mill, which leads to a decrease in its productivity.

Of the known mills for assembling and welding longitudinal seam pipes of large diameter of finite length, the closest in technical essence is the mill described in US Pat. RF №2287389, cl. BC21 37/08 claimed March 14, 2005, publ. November 20, 2006

This mill contains in one line the means of feeding the tube billet, a stand for fixing the mandrel, guide knives, an input stand, a welding stand, a welding machine and an inner mandrel. The welding machine is fixed motionless. In the welding stand with a welding machine, side roller cartridges, a central roller cartridge and upper roller cartridges are installed on the body. The welding stand is mounted on racks. On racks mounted lifting mechanisms that serve to attach the stand.

A disadvantage of the known mill design is the reduction in the quality of the welded seam of the tube billet due to the lack of lateral adjustment of the electrodes relative to the welded joint.

Another disadvantage of the known design is the low maintainability and the considerable time spent on transhipment of welding stands when switching to another pipe size. This is due to the fact that the welding machine is installed stationary along the axis of the mill. When transferring the stands to another standard size or replacing rolls or roller cassettes as a result of breaking them in the welding stand, it is necessary to dismantle the welding machine. Then, using a crane, remove the welding cage, having previously rolled out the inner mandrel. A lot of time is spent on dismantling the welding machine, installing the welding stand in the line of the mill, which must again be mounted after repair or transshipment, which increases the downtime of the mill, reduces its productivity and maintainability.

The objective of this utility model is to create a mill for assembling and welding longitudinal seam pipes of large diameter of finite length, which allows to improve the quality of the welded seam of the pipe billet, maintainability of the mill and reduce the time required for transshipment of the welding stand when switching to another pipe size, in addition, significantly reduce the time necessary to replace the mechanisms or rolls of the welding stand when they break and increase the productivity of the mill.

This object is achieved in that the mill for assembling and welding longitudinal seam pipes of large diameter of finite length, containing installed in one line means for feeding the tube stock, stand for fixing the mandrel, guide knives, input stand, welding stand, welding machine and inner mandrel, according to the useful models equipped with a mechanism for moving the welding machine, including a carriage moving from the drive along vertical cylindrical guides mounted on a frame, a movable plate mounted on the carriage y fixed thereto with the welding apparatus, with a movable actuator plate is provided with horizontal movement fixed to the carriage, in addition, movement of the carriage drive and the drive of the horizontal displacement of the movable plate are formed as actuating kinematic pairs of screw-nut.

Such a constructive implementation of the mill for assembling and welding longitudinal seam pipes of large diameter of finite length will improve the quality of the welded seam of the pipe billet, maintainability of the mill and reduce the time required for transshipment of the welding stand when switching to another pipe size. In addition, significantly reduce the time required to replace the mechanisms or rolls of the welding stand when they break, and increase the productivity of the mill.

Improving the quality of the weld is achieved by ensuring the accuracy of the guidance of the electrodes of the welding head on the welded joint within the permissible limits. By moving relative to the seam of the movable plate in the carriage, lateral adjustment of the position of the welding machine during welding can be made.

Thanks to the movement mechanism of the welding machine, which makes it easy to roll out the welding machine from the working area as necessary, for example, when transferring the welding stand, the maintainability of the mill increases and the time spent on transferring the welding stand is reduced, the time for replacing the mechanisms or rolls of the welding stand when they break, is reduced, and, therefore, increases the productivity of the mill.

To explain the utility model, a specific example of the implementation of the utility model is given below with reference to the accompanying drawings, in which:

figure 1 - shows a mill for assembly and welding of longitudinal pipes of large diameter of finite length;

figure 2 is the same, a section aa in figure 1;

figure 3 is the same, view B in figure 1;

figure 4 is a view In figure 2;

figure 5 - place G in figure 2;

in Fig.6 - place D in Fig.3;

in Fig.7 - place W in Fig.2;

on Fig - section ZZ in Fig.6.

A mill for assembling and welding longitudinal seam pipes of large diameter of a finite length contains a means for supplying a tube stock 1, a stand 2 for fixing the mandrel, guide knives 3,4, an input stand 5, a welding stand 6, a welding machine 7, an inner mandrel 8 and the mechanism 9 for moving the welding machine.

The strip feeding means 1 is provided with a chain pusher 10, hoisting-and-turning rollers 11 and roller table rollers 12.

The input stand 5 consists of a housing 13 with mounted roller cassettes 14 and is mounted on racks 15.

In the welding stand 6 on the casing 16, lateral roller cassettes 17, a central roller cassette 18 and upper roller cassettes 19 are installed. The welding stand 6 is mounted on the uprights 20. On the uprights 20 are mounted lifting mechanisms 21 for adjustment.

The inner mandrel 8 is equipped with spring-loaded lower support rolls 22, upper 23 and lower 24 support rollers. The mandrel 8 is pivotally mounted on the knife 4, which is mounted on the stand 2 for fixing the mandrel. Knife 3 serves to orient the pipe billet with its connector along the axis of the mill.

The welding machine moving mechanism 9 comprises a carriage 25 moving from the actuator 26 along vertical cylindrical guides 27 mounted on the frame 28. The actuator 26 is located on the frame 28. A movable plate 29 is mounted on the carriage 25, on which the welding machine is mounted 7. The movable plate 29 is provided drive 30 horizontal movement, mounted on the carriage 25.

The drive 26 for moving the carriage 25 and the drive 30 for horizontal movement of the movable plate 29 are made in the form of kinematic drive pairs screw 31 - nut 32.

The mill for the assembly and welding of longitudinal seam pipes of large diameter of finite length works as follows.

Before feeding the tube billet 33, the gauges of the inlet stand 5 and the welding stand 6 are adjusted in the mill to the corresponding tube sizes. The guide knife 3 and the inner mandrel 8 are also adjusted to a given caliber. The pipe billet 33 is fed through the rollers of the rolling table 12 to stand 2 and stops. Then the pipe billet 33 rises on the lifting and turning rollers 11 and starts to rotate them until its connector is on the axis of the mill, then the rotation of the pipe billet 33 is stopped and it is lowered by the lifting and turning rollers 11 on the rollers of the roller table 12. Lifting and turning the rollers 11 are removed for forming the rolls of the rollers of the roller table 12. A guide knife 3 is lowered into the socket of the tube billet 33 and the tube billet 33 is fed by a chain pusher 10 into the input stand 5 and then into the welding stand 6, where the chrome converges approx workpiece to a given welding gauge. Moreover, the assembly and retention of the edges is carried out due to the upper rollers of the central roller cassette 18, the upper roller cassettes 19 and the side roller cassettes 17 and the support rollers 22 and 23 of the mandrel. After that, the welding machine 7 is turned on and the workpiece 33 with the welding speed is moved by a chain pusher 10 to the exit.

When switching to the manufacture of pipes of a similar size using the mechanism 9, in which a welding machine 7 is mounted on the movable plate 29, the carriage 25 is lifted up by the drive 26 along vertical cylindrical guides 27 mounted on the frame 28, and the welding head of the welding machine is brought out 7 for the vertical dimension of the welding stand 6. Then, raise the input 5 and welding 6 stands or lower these stands using the lifting mechanism 21, pre-set the required number of measured pads, and the set mandrel to the desired caliber is rolled into the mill and mounted on the knife 4. After that, the welding machine 7 is returned using the mechanism 9 to the axis of the mill and set it at the desired height.

When changing to a different pipe size, which this welding 6 and input 5 stands cannot provide, transhipment is carried out by the stands, while the welding machine 7, using the mechanism 9, is removed beyond the dimensions of the welding stand 6. The stands for this size are removed by a crane and other stands are installed, which provide the necessary standard size of pipes.

The proposed mill for assembly and welding of longitudinal seam pipes of large diameter of finite length compared to the known ones allows to improve the quality of the welded seam of the pipe billet, maintainability of the mill and reduce the time required for transshipment of the welding stand when switching to another pipe size, in addition, significantly reduce the time required for replacement mechanisms or rolls of the welding stand when they break and increase the productivity of the mill.

Claims (2)

1. A mill for assembling and welding longitudinal-seam pipes of large diameter of finite length, containing installed in one line means for feeding the tube stock, stand for fixing the mandrel, guide knives, inlet stand, welding stand, welding machine and inner mandrel, characterized in that it is equipped a welding machine moving mechanism comprising a carriage mounted to be movable from the drive on vertical cylindrical guides mounted on the frame and a movable plate mounted on the carriage, on which the welding machine is fixed, while the movable plate has a horizontal displacement drive mounted on the carriage. 2. The mill according to claim 1, characterized in that the carriage movement drive and the horizontal movement drive of the movable plate are made in the form of drive kinematic screw-nut pairs.

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