RU2620223C2 - Inlet section of continuous stan-tandem traveling line of cold roller or travel line connected with cold rolling stan-tandem installation - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: apparatus includes an input section including upper and lower unwinders (1a, 1b) for unwinding and feeding the strips to be processed, respectively, at the upper and lower levels, upper and lower cutting devices (2a, 2b), upper and lower transfer tables (3a, 3b) for each strip and a connecting device (4). The transfer tables (3a, 3b) are configured to deliver the noted strips to the connecting device (4) adapted to connect the rear coiled strip and the front coiled strip, and a welding machine (6) made with the possibility of butt welding of the noted rear coiled strip and a front coiled strip. Each of the transfer tables (3a, 3b) is made in the form of a loop table (5) adapted to form the strip loops for its centering directly on the noted transfer tables (3a, 3b) and to feed the strips connected on the connecting device (4) in the form of the common draw roller, directly to the welding machine (6) without additional looping. The upper table (3a) is provided with means for its retraction and subsequent lifting.

EFFECT: reduced strip processing cycle.

9 cl, 3 dwg

Description

FIELD OF THE INVENTION

[0001] The present invention relates to the field of continuous processes in the steel industry and provides an improvement in terms of productivity, production and cost savings. Such continuous processes are, for example, processes performed on pickling lines, optionally connected to cold rolling mills, or performed on continuous rolling mills.

BACKGROUND

[0002] A well-known technical problem of the above lines is that the input section in which two consecutive strips are welded together is one of the main bottlenecks of the line. For this reason, the temporal parameters of the functioning of the input part of the line are very important for the annual output. This is even more true when coils transmit short stretches of strip.

[0003] For the welding process, a loop is required before the welding installation. Existing solutions, such as a pre-loading table on a continuous annealing line (UFO) or on a continuous galvanizing line (NLC), are not applicable for processing hot rolled strips. Due to the high thickness and large mass of the loop for these hot rolled strips, a different inlet design is needed to ensure safe loop creation and alignment.

[0004] A typical diagram of such an input section is shown in FIG. one.

[0005] The entry cycle is the time during which the rear end of the roll and the front end of the next roll operate at a lower speed than the speed of the etching or rolling process.

[0006] In the entry loop, in general, the following steps are provided:

- reduce the speed from processing speed to input speed;

- transmit the rear end of the first roll from the first unwinding coil 1A to the first cutting scissors 2a,

- cut on the first scissors 2a,

- transmit the rear end of the first roll to the common broaching roller 4 by means of the first transmission table For,

- transmit the rear end of the first roll from a common broaching roller 4 to the welding machine 6.

[0007] In parallel with these first steps, the following steps are performed so that the rear end of the first roll and the front end of the second roll can be butt welded without loss of time:

- transmit the front end of the second roll (next roll) from the second unwinding reel 1b in to the second cutting shears 2b,

- cut on the second scissors 2b,

- transmit the front end of the roll to a common broaching roller 4 by means of a second transfer table 3b,

- transmit the front end of the second roll from a common broaching roller 4 to the welding machine 6 and create a loop on the loop table 5, necessary for centering the roll on the welding machine,

- weld the two ends of the rolls with each other,

- Re-accelerate to maximum entry speed.

[0008] During these operations, the intermediate pickling or rolling treatment section still operates at rated speed due to the storage capacity of the loop device.

[0009] Thus, if the entry cycle is reduced, this will make it possible to accelerate the work in the etching section with the same capacity of the loop device.

OBJECTS OF THE INVENTION

[0010] The present invention is directed to reducing the entry cycle time in continuous lines used in the steel industry, thereby reducing production time on the above lines.

[0011] Another objective of the invention is to simplify the input section of the pickling line / tandem of cold rolling.

[0012] Another other objective is to reduce to zero or reduce the transmission time from a common broaching roller to the welding machine.

[0013] The invention is also directed to improving the creation of a loop and improving the alignment of strips of large caliber.

SUMMARY OF THE INVENTION

[0014] The first object of the invention is a continuous industrial equipment having an input section containing two unwinding devices for unwinding and dispensing strip materials to be processed, a cutting device and a transfer table for each strip, as well as a connecting device, the transfer tables being arranged to deliver said strips to the connecting device, providing the connection of the rear roll strip and the front roll strip, at least a loop table for centering olos and a welding machine, which provides butt welding of said rear roll strip and front roll strip, characterized in that each of the transfer tables is also a loop table, so that directly on said transfer tables, it is possible to make loops for centering the strip, feed the connected strips on the connecting device directly to the welding machine, without additional looping (p. 1 claims).

[0015] In accordance with exemplary embodiments of the present invention, possibly preferred embodiments, continuous industrial equipment having an inlet section is further characterized by one of the following features or a suitable combination of these features (claims 2-10):

- transfer tables contain an upper table defining an upper input level and superimposed on a lower table defining a lower input level; the equipment is equipped with means designed to first divert and then raise the upper table;

- each unwinding device comprises an unwinding reel;

- each cutting device contains scissors;

- the connecting device contains a common lingering roller;

- these means, designed to first divert and then lift the upper table, contain at least one hydraulic or pneumatic cylinder for the removal of the upper table and at least one hydraulic or pneumatic cylinder for lifting the upper table, the last cylinders being located near the connecting device,

- said hydraulic or pneumatic cylinders have been partially or completely replaced by screws driven by electric or hydraulic motors;

- the equipment contains non-contact sensor means for controlling the height of the loop on the lower table and to prevent collision of the specified loop with the upper table;

- non-contact sensor means are a light barrier;

- the equipment contains a rotary wheel for centering the strip, made with the possibility of moving to the strip by means of a hydraulic or pneumatic cylinder.

[0016] The second object of the invention is a method of joining, aligning and butt welding of two strips in the input section of a continuous industrial equipment, characterized by the characteristics of paragraphs. 1-7 of the formula, characterized in at least the following steps (paragraph 11 of the claims):

- the moving roll N is processed during the lower input level;

- the next roll N + 1 is introduced, prepared and cut at the upper input level, with its front end being placed in front of the common broaching roller in the standby position;

- provide the output of the rear end of the roll N sequentially from the mandrel of the unwinding reel, the lower input level and the common broaching roller, create a loop on the output side of the welding machine to center the rear end;

- immediately after the common broaching roller is released, the front end of the N + 1 roll at the upper input level is carried out by means of a common broaching roller to the input side of the welding machine;

- in accordance with the speed difference between the upper input level and the common lingering roller create a loop on the upper transfer table;

- after creating this loop, the upper roller of the common broaching roller is retracted to allow the strip to move during alignment;

- the rear end of the roll N and the front end of the roll N + 1 are butt welded in the welding unit;

- then submit a new roll N + 1 to the line through the upper input level;

- the next roll N + 2 is introduced, prepared and cut at the lower input level, with its front end being placed in front of the common broaching roller in the standby position;

- provide the output of the rear end of the roll N + 1 from the mandrel of the unwinding reel, the upper input level and the common broaching roller, create a loop on the output side of the welding machine to center the rear end;

- immediately after the common broaching roller is released, the front end of the N + 2 roll at the lower level is carried out by means of a common broaching roller to the input side of the welding machine;

- to provide the possibility of creating a high loop to perform the function of safe alignment, the upper transfer table is retracted and lifted up by means of hydraulic or pneumatic cylinders and / or powered screws;

- in accordance with the difference in speeds between the input level and the common broaching roller create a loop on the lower transfer table;

- after creating this loop, the upper roller of the common broaching roller is retracted to allow the strip to move during the alignment process;

- the rear end of the roll N + 1 and the front end of the roll N + 2 are butt welded in the welding unit;

- then a new roll N + 2 is fed to the line through the lower input level.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 illustrates a typical configuration of an inlet section made in accordance with the state of the art in the field of hot rolling.

[0018] FIG. 2 is a detailed view of the configuration of FIG. one.

[0019] FIG. 3 shows a preferred embodiment of an inlet section in accordance with the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0020] In accordance with the invention, in order to shorten the entry cycle, as described above, a new hinge table concept has been developed. A design with two transfer tables 3a, 3b (one for each passage line), a common broaching roller 4 and a loop table 5 (as in FIG. 2) is replaced by a design with only two transfer tables 3a, 3b, providing a looping function 5 and a common drawing roller 4. Accordingly, the loops for centering the strip are made directly on said transfer tables. A new solution is shown schematically in FIG. 3. The invention relates to an apparatus comprising any suitable welding machine 6. It should be noted that the welding machine shown in FIG. 3 is an example of a commercially available welding machine.

[0021] In accordance with a preferred embodiment of the present invention, and in order to ensure that there is sufficient space to create a loop on the lower passage line, the upper loop table can be retracted and raised. When it is necessary to create a loop on the lower passage line, it is preferable to first lower the upper table using a hydraulic or pneumatic cylinder, and then lift it using two hydraulic or pneumatic cylinders located near a common lingering roller.

[0022] Thus, when the upper table is raised, a lower hinge can be created.

[0023] In more detail, the method of joining, aligning and butt welding of two strips is performed as follows.

[0024] A moving roll Ν (N is an integer> 0) is processed over the lower or lower input level containing the lower table. The next roll N + 1 is introduced, prepared and cut with scissors at the top or upper entrance level containing the upper table. The new front end of the N + 1 roll is placed in front of the common pull roller in the standby position. When the rear end of the roll N exits sequentially from the mandrel of the unwinding reel, the lower input level and the common broaching roller, a loop is created on the output side of the welding machine using two loop rollers (not shown) to center the rear end.

[0025] A new feature of the invention, an upper gas station, combines three functions. The first function is to position the front end of the next N + 1 coil, which is already close to the common draw roller of the welding machine. The second function is to create a loop on this table. The third function is to enable the N + 2 strip to be fed into a common broaching roller during loop creation and N + 1 strip welding in the shadow stage of the welding process.

[0026] Immediately after the common broaching roller is released, a new front end of the N + 1 roll at the upper input level is carried out by means of a common broaching roller to the input side of the welding machine. In accordance with the speed difference between the upper input level and the common broaching roller, a loop is created on the upper transfer table. After creating this loop, the upper roller of the common broaching roller is retracted by means of long stroke cylinders (not shown) to enable the strip to be moved during alignment.

[0027] In order to further improve the alignment process and prevent blocking of the strip (in particular of thick and hard materials) on the upper common broaching roller, a special centering swivel wheel 7 is brought to the strip by means of a hydraulic or pneumatic cylinder. This allows you to improve the movement of the loop during alignment with the integrated centering device of the welding machine. Thanks to this equipment, the alignment accuracy of the weld can be improved to reduce other problems during strip tracking, side edge trimming and cold rolling. After alignment, the alignment swivel wheel 7 is retracted so as to allow the strip to be transported during subsequent welding and step accelerations.

[0028] Then, the rear end of the roll N and the front end of the roll N + 1 are butt welded in the welding machine.

[0029] Then, a new roll N + 1 is fed to the line through the upper input level. The next roll N + 2 is introduced, prepared and cut with scissors at the lower input level. The new front end of the N + 2 roll is placed in front of the common pull roller in the standby position. The rear end of the N + 1 roll exits sequentially from the mandrel of the unwinding reel, the upper input level and the common broaching roller, and create a loop on the output side of the welding machine using two loop rollers (not shown) to center the rear end. Immediately after the common broaching roller is released, a new front end of the N + 2 roll at the lower level is carried out, by means of a common broaching roller, to the input side of the welding machine. In this case, it is necessary to ensure the possibility of creating a high loop to perform the function of safe alignment. For this, the upper transfer table is retracted and lifted upwards by means of hydraulic or pneumatic cylinders. In order to prevent the hinge from colliding with the upper filling station, it is preferable to control the hinge height using a light barrier. In accordance with the speed difference between the input level and the common broaching roller, a loop is created on the lower transfer table. After creating this loop, the upper roller of the common broaching roller is retracted by means of long stroke cylinders to enable the strip to be moved during alignment. The considerations given in paragraph [0027] also apply in this case.

[0030] Then, the rear end of the N + 1 roll and the front end of the N + 2 roll are butt welded in the welding machine. Next, a new roll of N + 2 is fed to the line through the lower input level.

[0031] Subsequent new rolls are processed alternately in the lower and upper input sections, with subsequent loops being created alternately on the upper and lower input tables.

[0032] Unlike other strip processing lines, such as UFOs and NLCs, the proposed line also allows processing of thick hot rolled strips.

[0033] The principles of the invention make it possible to dispense with the loop table used in prior art solutions, and thus also save time on transferring the strip from a common broaching roller to the welding machine. Depending on the thickness of the strip, the time gain is usually from 5 to 7 seconds for each entry cycle. For example, the new entry design under consideration allows reducing production time (i.e., increasing productivity) by about 2% for pickling line or / tandem cold rolling with a capacity of 2 million tons, depending, however, on incoming rolls and line configuration.

[0034] In addition, the present invention improves looping. Due to the fact that a retractable upper table and a centering wheel are additionally provided, the possibility of improved centering of a large caliber is provided.

LIST OF REFERENCE NUMBERS

1a - unwinding reel;

1b - unwinding reel;

2a - scissors;

2b - scissors;

3a - transfer table;

3d - transfer table;

4 - general lingering roller;

5 - loop table / tables;

6 - welding machine;

7 - swivel wheel alignment.

Claims (24)

1. Installation for butt welding of strips in a continuous cold rolling line, comprising an inlet section including upper and lower unwinding devices (1a, 1b) for unwinding and feeding the strips to be processed at the upper and lower levels, respectively, upper and lower cutting devices ( 2a, 2b), the upper and lower transfer tables (3a, 3b) for each strip and the connecting device (4), and the transfer tables (3a, 3b) are configured to deliver these bands to the connecting device (4), made with the possibility ü connection of the rear roll strip and the front roll strip, and a welding machine (6), configured to butt weld the specified rear roll strip and the front roll strip, characterized in that each of the transfer tables (3a, 3b) is made in the form of a loop table ( 5), made with the possibility of forming loops of the strip for centering it directly on the indicated transfer tables (3a, 3b) and feeding the strips connected on the connecting device (4) in the form of a common broaching roller directly to the welding machine (6) without additional loop formation, while the upper table (3a) is equipped with means for its abduction and subsequent lifting. 2. Installation according to claim 1, characterized in that each unwinding device (1a, 1b) is made in the form of an unwinding coil. 3. Installation according to claim 1, characterized in that each cutting device (2a, 2b) is made in the form of scissors. 4. Installation according to claim 1, characterized in that said means for withdrawing and raising the upper table comprise at least one hydraulic or pneumatic cylinder for retracting the upper table (3a) and at least one hydraulic or pneumatic cylinder for raising the lower table (3b ), with the location of the last cylinder or cylinders near the connecting device (4). 5. Installation according to p. 1, characterized in that the means of removal and subsequent lifting of the upper table are at least partially made in the form of screws driven by electric or hydraulic motors. 6. Installation according to claim 1, characterized in that it contains proximity sensors for monitoring the height of the hinge on the lower table (3b) and preventing collision of the specified hinge with the upper table (3a). 7. Installation according to claim 6, characterized in that the proximity sensors are made in the form of a light barrier. 8. Installation according to claim 1, characterized in that it comprises a rotary wheel (7) for centering the strip, made with the possibility of moving to the strip by means of a hydraulic or pneumatic cylinder. 9. The method of butt welding of strips in the installation for butt welding according to any one of paragraphs. 1-5, including the supply of strips to the input section, while at least the following steps are carried out: - the moving roll N is processed throughout the lower level of the inlet section, - the next roll N + 1 is introduced, prepared and cut at the upper level of the inlet section, with its front end being placed in front of the common broaching roller in the standby position, - provide the output of the rear end of the roll N sequentially from the mandrel of the unwinder, the lower level of the input section and the common broaching roller, create a loop on the output side of the welding machine to center the rear end, - immediately after the common broaching roller is released, the front end of the N + 1 roll at the upper level of the inlet section is carried out by means of a common broaching roller to the input side of the welding machine, - in accordance with the speed difference between the upper level of the inlet section and the common lingering roller create a loop on the upper transfer table, - after creating this loop, the upper roller of the common broaching roller is retracted to allow the strip to move during alignment, - the rear end of the roll N and the front end of the roll N + 1 are butt welded in a welding machine, - then submit to the line a new roll N + 1 through the upper level of the input section, - enter, prepare and cut the next roll N + 2 at the lower level of the input section, and its front end is placed in front of a common lingering roller in the standby position, - provide the output of the rear end of the roll N + 1 from the mandrel of the unwinder, the upper level of the input section and the common broaching roller, create a loop on the output side of the welding machine to center the rear end, - immediately after the common broaching roller is released, the front end of the N + 2 roll at the lower level is carried out by means of a common broaching roller to the input side of the welding machine, - to form a high loop and thereby ensure safe alignment, the upper transfer table is retracted and lifted up by means of hydraulic or pneumatic cylinders and / or powered screws, - in accordance with the difference in speeds between the level of the inlet section and the common broaching roller create a loop on the lower transfer table, - after creating this loop, the upper roller of the common broaching roller is retracted to allow the strip to move during alignment, - the rear end of the roll N + 1 and the front end of the roll N + 2 are butt welded in a welding machine and then a new roll N + 2 is fed to the line through the lower level of the inlet section.

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