A method and device for calibrating a side guide plate of a hot continuous rolling finishing mill train

Abstract

The application discloses a kind of hot continuous rolling finishing mill set side guide plate's calibration method and device, it is related to hot rolling technical field, the method includes: closing side guide plate A to fixed limit block A, record the distance of side guide plate A inside to rolling mill frame center line as transmission side edge distance;Side guide plate B is closed to fixed limit block B, record the distance of side guide plate B inside to rolling mill frame center line as operating side edge distance;The sum of the transmission side edge distance and the operating side edge distance is calculated as side guide plate opening degree.The application adds fixed limit block to side guide plate, closes side guide plate to limit block, and determines transmission side edge distance and operating side edge distance according to frame center line position, and records this value, calibration only needs to close side guide plate to fixed limit block, and calibration can be carried out with previous measurement value, and side guide plate calibration precision and efficiency are greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot rolling, in particular to a method and device for calibrating a side guide plate of a finishing mill in a hot continuous rolling. BACKGROUND

[0002] The finishing mill side guide plate is one of the important equipment in hot continuous rolling production, which is installed at the entrance of each finishing mill, has a horn shape, plays a guiding role in the strip steel threading process, and plays a clamping role in the rolling process. Through the guiding and clamping action of the side guide plate, the center line of the strip steel can be effectively overlapped with the rolling center line, which plays a great role in stabilizing the rolling state.

[0003] In the long-term production process, the opening degree and centering degree of the finishing mill side guide plate have differences between the set value and the actual value due to mechanical wear and strip steel impact, and there are also differences between the racks, which superimpose to cause the strip steel to not be on the same center line when rolling on each rack, seriously affecting the rolling stability. Therefore, the opening degree and centering degree of the side guide plate need to be calibrated. The current method for calibrating the side guide plate is to measure the distance from the midpoint of the intermediate beam to the edge of the side guide plate, and calibrate according to the distance. However, this calibration method is not accurate due to the inconsistent wear on both sides of the side guide plate, the offset of the intermediate beam, and the large measurement error. At the same time, one person is needed for operation on and under the operation table during the calibration process, which is low in efficiency and cannot meet the requirements of high-efficiency operation.

[0004] CN107413859A discloses a method and device for improving the control precision of the opening degree of the finishing mill side guide plate, which obtains a first set value of the side guide plate, determines the side guide plate to be closed to a first opening degree according to the first set value, and performs calibration. When the strip steel reaches the entrance of the finishing mill, a second set value of the side guide plate is obtained. The side guide plate is opened to a third opening degree, and then closed to a second opening degree. When the strip steel enters the roll, a third set value of the side guide plate is obtained. The side guide plate is determined to be closed to a fourth opening degree. When the tail of the strip steel reaches the front of the side guide plate, a fourth set value of the side guide plate is obtained. The side guide plate is determined to be opened to a fifth opening degree.

[0005] CN107537869A discloses a method for calibrating the side guide plate at the entrance of the finishing mill in hot continuous rolling, which includes automatically controlling the position of the entrance side guide plate to a first width, measuring the opening degree of the side guide plate, the first distance from the inside of the operating side balance block to the inside edge of the operating side guide plate, and the second distance from the inside of the driving side balance block to the inside edge of the driving side guide plate. If the opening degree of the side guide plate is greater than or equal to the first width, less than or equal to the sum of the first width and a preset first error, and the absolute value of the difference between the first distance and the second distance is less than or equal to a preset second error, no calibration is performed. Otherwise, the operating side opening degree of the automatic position control and the driving side opening degree of the automatic position control are calibrated.

[0006] CN108421832A discloses a method and device for calibrating the entrance side guide plate of a finishing mill, controlling the first side guide plate to move to a first preset position according to a first preset method, and controlling the second side guide plate to move to a second preset position according to a second preset method; detecting the opening value between the first side guide plate and the second side guide plate, and detecting the first distance between the first side guide plate and the first archway, and the second distance between the second side guide plate and the second archway; calibrating the opening values ​​of the first side guide plate and the second side guide plate based on the opening value, the first distance, and the second distance.

[0007] CN105057369A discloses a method and device for calibrating the centering accuracy of the side guide plates of a finishing mill, which measures the distance A between the inner side of the first guide plate and the inner side of the first arch; measures the distance B between the inner side of the second guide plate and the inner side of the second arch; calculates the value of AB and calibrates the opening values ​​of the first guide plate and the second guide plate.

[0008] CN111715704A discloses a method for calibrating the side guides of a finishing mill, wherein side guides A and B are mounted on a slideway with a crossbeam in between. Before calibration, the slideways of side guides A and B should be checked for foreign matter. Both sides of side guides A and B are simultaneously opened to a certain degree, and the side guides A and B are manually closed and opened to test whether their movements are flexible. The slideway is then checked for mechanical obstruction.

[0009] The above measures still result in large manual measurement errors during calibration and require the cooperation of more than two people, resulting in low efficiency. This does not meet the efficient development trend in the steel industry. Therefore, measures need to be taken to optimize the side guide plate calibration method to improve calibration accuracy and efficiency. Summary of the Invention

[0010] The present invention aims to provide a method and device for calibrating the side guides of a hot rolling mill, which can effectively improve the calibration accuracy and efficiency of the side guides. To achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0011] The present invention discloses a calibration method for a side guide plate of a hot rolling finishing mill group, the calibration method comprising:

[0012] Close the side guide A to the fixed limit block A, and record the distance from the inner side of the side guide A to the center line of the rolling mill arch as the transmission side distance;

[0013] Close the side guide B to the fixed limit block B, and record the distance from the inner side of the side guide B to the center line of the rolling mill arch as the operating side distance;

[0014] The sum of the distance between the transmission side edge portion and the distance between the operation side edge portion is calculated as the side guide plate opening degree.

[0015] Preferably, the calibration method further includes:

[0016] The center line position of the mill arch is determined according to the distance between the inner side of the mill arch A and the inner side of the mill arch B.

[0017] Preferably, the transmission side edge distance is an average value of multiple measurements by multiple people.

[0018] Preferably, the operating side distance is an average value of multiple measurements by multiple people.

[0019] Preferably, when the side guide plate A is closed to the fixed limit block A, the magnetic scale count of the side guide plate A will continue to decrease. When the magnetic scale count of the side guide plate A does not change for 3 consecutive seconds, the centering of the transmission side guide position is calibrated with the measured transmission side edge distance.

[0020] Preferably, when the side guide plate B is closed to the fixed limit block B, the magnetic scale count of the side guide plate B will continue to decrease. When the magnetic scale count of the side guide plate B does not change for 3 consecutive seconds, the centering of the operating side guide position is calibrated based on the measured operating side edge distance.

[0021] The present invention also discloses a calibration device for the side guide plates of a hot rolling finishing mill group, wherein:

[0022] A transmission side distance measuring structure and an operation side distance measuring structure are respectively provided on both sides of the middle beam of the side guide plate.

[0023] Preferably, the transmission side distance measurement structure includes:

[0024] Side guide rails, fixed limit blocks A, side guides A and mill archways A;

[0025] A fixed limit block A and a rolling mill arch A are added to one side of the side guide plate middle beam, one end of the side guide plate track is connected to the rolling mill arch A, the fixed limit block A is connected to the side guide plate middle beam, and the side guide plate A moves on the side guide plate track.

[0026] Preferably, the operating side distance measurement structure includes:

[0027] Side guide rails, fixed limit blocks B, side guides B and mill archways B;

[0028] A fixed limit block B and a rolling mill arch B are added to one side of the side guide plate middle beam, the other end of the side guide plate track is connected to the rolling mill arch B, the fixed limit block B is connected to the side guide plate middle beam, and the side guide plate B moves on the side guide plate track.

[0029] Technical effects and advantages of the present invention:

[0030] The present invention adds a fixed limit block to the side guide plate, closes the side guide plate to the limit block, determines the transmission side edge distance and the operating side edge distance according to the center line position of the archway, and records these values. During calibration, it is only necessary to close the side guide plate to the fixed limit block and calibrate with the previously measured value, thereby greatly improving the calibration accuracy and efficiency of the side guide plate.

[0031] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of a calibration device for side guide plates of a hot rolling finishing mill according to the present invention;

[0033] Figure 2 This is a schematic flow chart of a method for calibrating side guide plates of a hot rolling finishing mill according to the present invention;

[0034] Figure 3 This is a schematic diagram comparing the calibration time and aperture accuracy before and after implementation of a calibration method for side guide plates of a hot rolling finishing mill of the present invention. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] In order to solve the deficiencies of the prior art, the present invention discloses a calibration device for the side guide plate of a hot rolling finishing mill, such as Figure 1 The present invention is a schematic diagram of a calibration device for side guide plates of a hot rolling finishing mill, wherein the calibration device includes:

[0037] A transmission side distance measuring structure and an operation side distance measuring structure are respectively provided on both sides of the middle beam of the side guide plate.

[0038] Furthermore, the transmission side distance measurement structure includes: a side guide rail, a fixed limit block A, a side guide A and a rolling mill archway A;

[0039] A fixed limit block A and a rolling mill arch A are added to one side of the side guide plate middle beam, one end of the side guide plate track is connected to the rolling mill arch A, the fixed limit block A is connected to the side guide plate middle beam, and the side guide plate A moves on the side guide plate track.

[0040] Furthermore, the operating side distance measurement structure includes: a side guide rail, a fixed limit block B, a side guide B and a rolling mill archway B;

[0041] A fixed limit block B and a rolling mill arch B are added to one side of the side guide plate middle beam, the other end of the side guide plate track is connected to the rolling mill arch B, the fixed limit block B is connected to the side guide plate middle beam, and the side guide plate B moves on the side guide plate track.

[0042] Based on the above calibration device, the present invention also discloses a calibration method for the side guide plate of the hot rolling finishing mill, such as Figure 2 The present invention is a flow chart of a method for calibrating the side guides of a hot rolling finishing mill, which includes the following steps:

[0043] Determine the centerline position of the mill arch based on the distance between the inner side of mill arch A and the inner side of mill arch B;

[0044] Close the side guide A to the fixed limit block A, and record the distance from the inner side of the side guide A to the center line of the rolling mill arch as the transmission side distance;

[0045] Close the side guide B to the fixed limit block B, and record the distance from the inner side of the side guide B to the center line of the rolling mill arch as the operating side distance;

[0046] The sum of the distance between the transmission side edge portion and the distance between the operation side edge portion is calculated as the side guide plate opening degree.

[0047] Specifically, a calibration process of the side guide of a hot rolling finishing mill is as follows:

[0048] The centerline position of the mill arch is determined based on the distance between the inside of mill arch A and the inside of mill arch B, and this is recorded in the system. Side guide A moves on the side guide track and is closed to fixed stopper A. At this point, the distance from the arch centerline position to the transmission side edge is recorded as the transmission side edge distance, with the midpoint being the midpoint. To ensure measurement accuracy, multiple measurements by multiple people are required to obtain the average value.

[0049] Furthermore, when the side guide plate A is closed to the fixed limit block A, the magnetic scale count of the side guide plate A will continue to decrease. When the side guide plate A contacts the fixed limit block A, it is affected by the resistance of the fixed limit block A. When the magnetic scale count of the side guide plate A does not change for 3 consecutive seconds, it is considered that the side guide plate A is close to the fixed limit block A. At this time, the centering of the position of the side guide plate A on the transmission side is calibrated based on the measured distance from the transmission side edge.

[0050] The side guide plate B moves on the side guide plate track and is closed to the fixed limit block B. At this time, the distance from the center line of the archway to the operating side edge is recorded as the operating side edge distance. To ensure measurement accuracy, multiple people are required to measure multiple times to take the average value.

[0051] Further, when the side guide B is closed to the fixed limiting block B, the side guide B magnetic scale count will continue to decrease, when the side guide B contacts the fixed limiting block B, under the resistance of the fixed limiting block B, the magnetic scale count will no longer change after the side guide B contacts the fixed limiting block B, when the magnetic scale count does not change for 3 seconds in a row, it is considered that the side guide B is in close contact with the fixed limiting block B, at this time, the operation side edge distance is measured to calibrate the centering degree of the operation side side guide position.

[0052] Further, the side guide opening degree is calculated based on the sum of the operation side edge distance and the transmission side edge distance.

[0053] In October 2020, the automatic calibration of the side guide at the entrance of the finishing mill of the hot rolling line in Xichang Steel Vanadium was completed, after the transformation, the side guide calibration was carried out once a day, the side guide calibration value was retested once a month, and the system was maintained according to the retest results to ensure the accuracy of the calibration system. Compared with the previous manual measurement, automatic calibration can effectively improve the calibration accuracy of the side guide, reduce the work burden of the operator, and through nearly one and a half years of tracking, such as Figure 3 The calibration time and opening degree accuracy comparison diagram before and after the implementation of the calibration method of the side guide of the hot continuous rolling finishing mill train.

[0054] Figure 3 It is shown that the side guide calibration time is reduced from 14 min / once before implementation to 2 min / once after implementation, the production time is increased by about 12 minutes per day, and nearly 60 hours of production time can be increased per year, which provides support for the improvement of production line efficiency, at the same time, the side guide centering degree accuracy deviation is improved from 7 mm to 3 mm, the equipment operation precision is improved, and the stability and smoothness of production are ensured.

[0055] Finally, it should be noted that: the above only describes the preferred embodiments of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for calibrating the side guides of a hot rolling finishing mill, characterized in that: The calibration method comprises: Determine the centerline position of the mill arch based on the distance between the inner side of mill arch A and the inner side of mill arch B; Close the side guide A to the fixed limit block A. The magnetic scale count of the side guide A will continue to decrease. When the magnetic scale count of the side guide A does not change for 3 consecutive seconds, calibrate the centering of the transmission side side guide position based on the measured transmission side edge distance. Record the distance from the inner side of the side guide A to the center line of the rolling mill arch as the transmission side edge distance. Close the side guide B to the fixed limit block B. The magnetic scale count of the side guide B will continue to decrease. When the magnetic scale count of the side guide B does not change for 3 consecutive seconds, the centering of the operating side side guide position is calibrated based on the measured operating side edge distance. The distance from the inner side of the side guide B to the center line of the rolling mill arch is recorded as the operating side edge distance. Calculating the sum of the distance between the transmission side edge and the distance between the operating side edge as the side guide opening degree; The calibration method is implemented using the following calibration device: In the calibration device: a transmission side distance measuring structure and an operating side distance measuring structure are respectively provided on both sides of the middle beam of the side guide plate; The transmission side distance measurement structure includes: a side guide track, a fixed limit block A, a side guide A and a rolling mill archway A; a fixed limit block A and a rolling mill archway A are added to one side of the side guide middle beam, one end of the side guide track is connected to the rolling mill archway A, the fixed limit block A is connected to the side guide middle beam, and the side guide A moves on the side guide track; The operating side distance measurement structure includes: a side guide track, a fixed limit block B, a side guide plate B and a rolling mill arch B; a fixed limit block B and a rolling mill arch B are added on one side of the side guide plate middle beam, the other end of the side guide track is connected to the rolling mill arch B, the fixed limit block B is connected to the side guide plate middle beam, and the side guide plate B moves on the side guide track.

2. The method for calibrating the side guides of a hot rolling finishing mill according to claim 1, characterized in that: The transmission side distance is the average value of multiple measurements taken by multiple people.

3. The method for calibrating the side guides of a hot rolling finishing mill according to claim 1, characterized in that: The operating side distance is the average value of multiple measurements taken by multiple people.

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