KR101560838B1 - Vertical sort diagnostic device for rolling machine and diagnostics - Google Patents

Abstract

The present invention relates to a vertical alignment diagnosis apparatus and a diagnosis method of a hot rolling mill capable of diagnosing a state in which an upper backup roll and an upper work roll, a lower work roll and a lower backup roll are vertically aligned, The upper and lower work rolls, the upper and lower work rolls, the housing gutter for connecting the upper and lower work rolls and the upper and lower backup rolls to the housing, By checking the vertical angle of the housing liner, a diagnostic device for diagnosing vertical alignment can be constructed to reduce the unnecessary measurement work of the abnormal points, and the repair can be performed immediately when the abnormality occurs. Therefore, Thereby contributing to productivity and quality improvement.

Hot Rolling Mill, Work Roll, Beck Up Roller, Communication Card, Zero Adjustment, Housing Gutter, Load Cell, Work Station, Piel, Housing Liner, Right Angle

Description

TECHNICAL FIELD [0001] The present invention relates to a vertical alignment diagnostic device for a rolling mill,

The present invention relates to a vertical alignment diagnosing apparatus and a diagnosing method of a hot rolling mill, and more particularly, to a vertical aligning diagnostic apparatus and method for diagnosing vertical alignment of a hot rolling mill, Diagnostic apparatus and diagnostic method.

1, the upper and lower work rolls 1 and 3 and the upper and lower backup rolls 2 and 4 are rotatably supported by the housing gutter 5 and the housing liner 6 And rolling the steel sheet passing through the roll gap G between the upper and lower work rolls 1 and 3 to a thickness desired by the customer.

The perpendicularity of the housing gutter 5 and the housing liner 6 of this hot rolling mill 8 is one of the important items of mill equipment management for preventing skew caused by the displacement of the center of the rolling mill in the rolling direction during rolling .

In order to ensure the rolling ductability of the hot rolling mill, it is necessary to manually measure the condition of the hot rolling mill at regular intervals. When the temperature exceeds the reference allowable range, the operator is requested to perform the replacement and repair work.

However, since a tandem mill type multistage mill such as a finishing rolling process has a large number of positions to be measured, there is a time limitation to measure the whole at one time. Therefore, it is necessary to carry out measurement several times over a plurality of times, There is no choice but to measure.

Therefore, in the conventional diagnosis apparatus and diagnosis method, there is no way to recognize the problem until the measurement period becomes a measurement cycle even if equipment alignment abnormality occurs.

This makes it possible to check and manage the angularity of the housing gutter and the housing liner uniformly and periodically, and a diagnostic apparatus and a diagnosis method that enable the manager to easily read the analysis results are in desperate need.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method and apparatus for automatically adjusting a roll gap after zero- The present invention provides a vertical aligning diagnostic apparatus and method for a hot rolling mill in which a vertical angle is checked to check an abnormal position and then an abnormal point is intensively measured at a next repair date so that repair can be performed immediately.

Another object of the present invention is to make it possible to accurately and precisely measure a load using a load cell during a rolling process of a steel sheet.

In addition, another object of the present invention is to allow the PI of a load analysis unit and a workstation to transmit a long distance by using a communication card.

Another object of the present invention is to output the analysis result as a graph so that the administrator can easily read the analysis result.

In order to achieve the above object, the present invention provides a vertical alignment diagnosis apparatus for diagnosing vertical alignment of upper and lower work rolls and upper and lower backup rolls housed in a housing of a hot rolling mill, A load cell installed at the bottom of the housing in which the work roll and the lower backup roll are located and measuring a differential load which is a difference between a drive side load and a work side load of a rolling mill during a rolling operation; A load analyzer for receiving an electrical signal of the load cell to convert the electrical signal into load data and analyzing the load data; And a personal computer for receiving the load data from the load analysis unit and outputting an analysis result.

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Also, in the present invention, the load analyzing unit analyzes the micro load data of the area where the load data is received by receiving the load data of the Piel seed, which receives the electric signal of the load cell and converts it into the load data, And a workstation that is programmed to collect.

In addition, in the present invention, the PIEC and the workstation further include a communication card for transmitting and receiving data.

The vertical alignment diagnosis method of a hot rolling mill according to the present invention includes: a zero point adjustment step of adjusting a zero point of a roll gap after replacing upper and lower work rolls of a hot rolling mill; A load check step of generating an electrical signal by checking the difference between the drive side load and the work side load of the rolling mill during the rolling operation after the zero point adjustment step; A data conversion step of converting the electrical signal into load data after the load check step; A load data collecting step of analyzing and collecting micro load data of an area where a load among the converted load data appears after the data conversion step; Outputting an analysis result of the collected micro load data after the load data collection step; After the result output step, the vertical alignment of the upper and lower work rolls and the upper and lower backup rolls of the hot rolling mill is checked by checking the perpendicularity of the housing gutter and the housing liner of the hot rolling mill according to the analysis result And a diagnostic step.

As described above, according to the present invention, after the work roll changing operation, which occurs about four times a day, at the time of zero point adjustment of the roll gap, the right angle of the housing gutter and the housing liner is automatically checked, It is possible to repair irregularities on the repair day intensively and to repair them immediately, thereby improving the speed of repair.

As described above, the cost can be reduced by reducing the unnecessary measurement work of the points where there is no abnormality, and the repair can be performed as soon as the abnormality occurs. Therefore, it is possible to secure the rolling rolling property and contribute to the improvement of productivity and quality.

Further, there is an effect that the load can be accurately and precisely measured using the load cell during the steel sheet rolling operation.

In addition, PI and workstations in the load analysis department have the effect of enabling remote transmission using a communication card.

In addition, there is an effect that the analysis result is outputted as a graph so that the administrator can easily read the analysis result.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

2 to 4, the apparatus for vertical alignment diagnosis of a hot rolling mill according to the present invention comprises upper and lower work rolls 1 and 3 and upper and lower backup rolls 2 and 4 of a hot rolling mill 8, In order to diagnose the vertically aligned state.

At this time, the hot rolling mill 8 is accommodated in a state where the upper and lower work rolls 1 and 3 and the upper and lower backup rolls 2 and 4 are rotatably connected to the housing gutter 5 and the housing liner 6 And a housing (7).

In order to diagnose the vertically aligned state of the hot rolling mill 8, the zero point of the roll gap G is adjusted after the replacement of the upper and lower work rolls 1 and 3. Then, during the rolling process, And the perpendicularity between the upper and lower work rolls 1 and 3 and the housing gutter 5 connecting the upper and lower backup rolls 2 and 4 to the housing 7 and the housing liner 6 P) to check the vertical alignment is constituted.
Here, the car load is defined as the difference between the drive side load and the work side load of the rolling mill.

The vertical alignment diagnosis apparatus 10 comprises a load cell 20, a load analysis section 30, and a personal computer 40.

The load cell 20 is a device installed on the bottom of the housing 7 where the lower work roll 3 and the lower backup roll 4 are located and measures a car load generated during a steel plate rolling operation.

The load analysis unit 30 is an apparatus configured to receive an electrical signal of the load cell 20, convert the received electrical signal into load data, and analyze the load data.

The load analysis unit 30 may be subdivided into a PIEC 31 and a workstation 32.
PLC (programmable logic controller) is a device that receives an electrical signal of the load cell 20 and converts it into load data.

In addition, the workstation 32 is a device programmed to analyze and collect only the micro load data of the area where the load is received by receiving the load data of the Piel seed 31.

In addition, the PI 31 and the work station 32 may further include communication cards 31a and 32a for transmitting and receiving data.

The personal computer 40 is configured to receive the load data collected by the load analysis unit 30 and to output the analysis result on a monitor in a graphical manner.

The diagnostic method using the vertical alignment diagnosis apparatus of the hot rolling mill according to the present invention will be described as follows.

5, the vertical alignment diagnosis method of the present invention includes a zero point adjustment step S1, a load check step S2, a data conversion step S3, a load data collection step S4, a result output step S5 ) And a diagnosis step S6.

The zero point adjustment step S1 is a step of adjusting the zero point of the roll gap G after replacing the upper and lower work rolls 1 and 3. That is, the zero point adjustment step S1 is a step of adjusting the roll gap G within the tolerance.

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The load check step S2 is a step of controlling the load load by the load cell 20 during the rolling process of the steel sheet by the hot rolling mill 8 after the zero point adjustment step S1 and generating an electrical signal.

The data conversion step S3 is a step in which an electrical signal of the load cell 20 is transmitted to the PIEC 31 and converted into load data after a load check step S2.

In the load data collection step S4, after the data conversion step S3, the load data converted by the PI 31 is transferred to the workstation 32 to analyze and collect only the micro load data of the area where the load appears .

The data conversion step S3 and the load data collection step S4 can quickly and accurately transmit data from a remote location using the communication cards 31a and 32a.

After the load data collection step S4, the result output step S5 receives the micro load data collected by the work station 32 and transmits the analysis result to the personal computer 40 in a graphical manner .

The diagnostic step S6 is a step of diagnosing the vertical alignment by checking the perpendicularity P between the housing gutter 5 and the housing liner 6 while viewing the graph after the result output step S5.

That is, by checking the perpendicularity P between the housing gutter 5 and the housing liner 6, the vertical alignment state of the upper and lower work rolls 1, 3 and the upper and lower backup rolls 2, You can see it while watching the graph.

The graph shown in FIG. 6 shows the relationship between the load and the amount of elastic deformation. Since the elastic deformation of the hot rolling mill 8 is defined as a linear increase in the load and the amount of elastic deformation linearly passing through the minimum load region The differential load of the rolling mill indicates that the overall load should be essentially constant without increasing or decreasing.

The graph shown in Fig. 7 shows a case where the perpendicularity P is normal. The upper and lower work rolls 1 and 3 and the upper and lower backup rolls 2 and 4, depending on the characteristics of the hot rolling mill 8, A graph of the sub-load having a constant slope due to the difference in the amount of elastic deformation of the normal load is shown.

The graph shown in FIG. 8 shows a case where the perpendicular angle P is in a bad state. When there is a problem in the vertical alignment, the curve shows an irregular curve or a fluctuation width instead of a constant load.

Thus, the perpendicular alignment diagnosis apparatus 10 can periodically check the perpendicularity P between the housing gutter 5 and the housing liner 6, so that the upper and lower work rolls 1 and 3, The vertical alignment state of the backup rolls 2 and 4 can be constantly diagnosed.
Thereby, there is an advantage that unnecessary management elements for performing diagnostic work do not occur even in a place where there is no abnormality.

In addition, there is an advantage that diagnostic cost can be reduced since unnecessary management elements are not generated.

In addition, since the repair is performed as soon as an abnormality occurs due to continuous diagnosis, it is advantageous to secure productivity of continuous rolling and to contribute to improvement of quality.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Various changes and modifications may be made by those skilled in the art.

1 is a schematic view schematically showing a conventional hot rolling mill,

2 is a schematic view briefly showing a hot rolling mill to which a load cell is applied,

3 is a device diagram showing a device for vertical alignment diagnosis of a hot rolling mill according to the present invention.

4 is a block diagram showing a vertical alignment diagnosis apparatus for a hot rolling mill according to the present invention,

5 is a flowchart showing a vertical alignment diagnosis method of a hot rolling mill according to the present invention,

6 is a graph showing the relationship between the load and the amount of elastic deformation,

7 is a graph showing the relationship between the car load and the amount of elastic deformation when the squareness is normal,

8 is a graph showing the relationship between the car load and the amount of elastic deformation when the squareness is defective.

Description of the Related Art

1: upper work roll 2: upper backup roll

3: Lower work roll 4: Lower backup roll

5: housing gutter 6: housing liner

7: Housing 8: Hot rolling mill

10: Vertical alignment diagnostic device 20: Load cell

30: load analysis section 31: Mr. Piel

31a, 32a: communication card 32: workstation

40: Personal computer S1: Zero point adjustment step

S2: load check step S3: data conversion step

S4: Load data collection step S5: Result output step

S6: Diagnosis phase

Claims (5)

A vertical alignment diagnosis apparatus for diagnosing vertical alignment of upper and lower work rolls (1, 3) and upper and lower backup rolls (2, 4) received in a housing (7) of a hot rolling mill (8) The vertical alignment diagnosis apparatus (10) Is provided at the bottom of the housing (7) in which the lower work roll (3) and the lower backup roll (4) are located, so that during the rolling operation, the drive side load of the rolling mill and the work side load A load cell 20 for measuring a differential load; A load analyzer 30 for receiving and analyzing an electrical signal of the load cell 20 into load data; And A personal computer 40 that receives the load data from the load analyzer 30 and outputs an analysis result, And the vertical alignment diagnosis apparatus of the hot rolling mill. delete The method according to claim 1, The load analysis unit (30) An electric signal of the load cell 20 is received and converted into the load data, A work station 32 programmed to analyze and collect microload data of a region where the load is received by receiving the load data of the Piel seed 31, And the vertical alignment diagnosis device of the hot rolling mill. The method of claim 3, Further comprising communication cards (31a, 32a) for transmitting and receiving data to and from the PIEC (31) and the workstation (32). A zero point adjusting step (S1) of adjusting the zero point of the roll gap (G) after replacing the upper and lower work rolls (1, 3) of the hot rolling mill; A load check step (S2) for checking the difference between the drive side load and the work side load of the rolling mill during the rolling operation after the zero point adjustment step (S1) to generate an electrical signal; A data conversion step (S3) of converting the electrical signal into load data after the load check step (S2); A load data collecting step (S4) of analyzing and collecting micro load data of an area where a load among the converted load data appears after the data converting step (S3); A result output step (S5) of outputting an analysis result of the collected micro load data after the load data collection step (S4); After the result output step S5 is performed, the perpendicularity P of the housing gutter 5 and the housing liner 6 of the hot rolling mill is checked according to the analysis result, and the upper and lower work rolls (S6) for diagnosing the vertically aligned state of the upper and lower backup rolls (2, 4) And a vertical alignment diagnosis method for the hot rolling mill.

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