An automatic calibration device and calibration method for the front guide of a hot rolling coiler

Abstract

The present invention discloses an automatic calibration device for the front guide of a hot rolling coiler. The inlet and outlet of the front guide are both provided with automatic calibration devices. The center line of the automatic calibration device coincides with the rolling center line. The automatic calibration device includes a calibration plate, a cylinder and a base base. The base base is installed on the equipment base, the fixed end of the cylinder is installed on the base base, the calibration plate is connected to the piston rod end of the cylinder by a fastener, and the calibration plate rises and falls following the extension and contraction of the cylinder. When the guide needs to be calibrated, the cylinders of the two sets of calibration devices simultaneously push the two calibration plates from the gap between the rollers to the high position, and then the guides on both sides close from the maximum opening and stop after contacting the calibration plate. At this time, the PLC writes the opening degree of the guides on both sides as half the width of the calibration plate, that is, 500mm, and the calibration is completed. The present invention also provides an automatic calibration method for the front guide of a hot rolling coiler.

Description

Technical Field

[0001] The invention belongs to the technical field of guide calibration, and in particular relates to an automatic calibration device and a calibration method for a front guide of a hot rolling coiler. Background Art

[0002] The front guide of a hot rolling coiler is used to help the strip align with the centerline before entering the coiler. It also works with the pinch rolls to clamp the strip to reduce the coil's towering shape. Currently, the front guide of the coiler is still manually calibrated.

[0003] Guide calibration refers to determining the distance between the inner wear plate surface of the guide beam and the rolling centerline. Guides are generally replaced weekly. Due to factors such as the machining precision of the guide beam and the risk of wear and deformation, a guide calibration is performed after each replacement to ensure that the actual guide opening matches the measured value.

[0004] The process of manual guide calibration is as follows: the operator opens the guide to the maximum position and uses a steel tape measure to find the center point of the roller; closes the guide to a smaller position, measures the horizontal distance from the inner side of the guide beam to the center point of the roller, and manually writes the number into the HMI screen system.

[0005] Manual calibration has many disadvantages. First, human participation is required throughout the process, with one person at the operating table and at least two people on-site to coordinate measurements. Second, on-site measurement personnel need to stand on the roller conveyor, which poses a safety hazard. Third, the accuracy of manual measurement cannot be guaranteed. Fourth, the entire calibration process is inefficient and time-consuming. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a device for automatically calibrating the front guide of a hot rolling coiler that is simple in structure and easy to use. The present invention also provides a method for automatically calibrating the front guide of a hot rolling coiler. The present invention can safely, efficiently and accurately complete the automatic calibration of the opening degree of the front guide of the coiler with one click, without the need for manual intervention during the process.

[0007] To achieve the above-mentioned purpose, the technical solution of the present invention is: an automatic calibration device for the front guide of a hot rolling coiler, wherein the entrance and exit of the front guide are both provided with automatic calibration devices, the center line of the automatic calibration device coincides with the rolling center line, the automatic calibration device includes a calibration plate, a cylinder and a base base, the base base is installed on the equipment foundation, the fixed end of the cylinder is installed on the base base, the calibration plate is connected to the end of the piston rod of the cylinder by a fastener, and the calibration plate rises and falls with the extension and contraction of the cylinder.

[0008] Furthermore, the automatic calibration device also includes a guide groove plate assembly I and a guide groove plate assembly II. The guide groove plate assembly I and the guide groove plate assembly II are installed on the basic base to form a guide groove for guiding the calibration plate. The calibration plate is located in the guide groove, and the calibration plate rises and falls in the guide groove following the extension and contraction of the cylinder.

[0009] Furthermore, wear-resistant plates are provided inside both ends of the guide groove. The wear-resistant plates are installed on both sides of the width direction of the inner hole of the guide groove to accurately control the position of the calibration plate. The two ends of the calibration plate are in contact with the wear-resistant plates respectively.

[0010] Furthermore, the guide groove plate assembly I and the guide groove plate assembly II have the same structure and both include an L-shaped guide plate and a flat plate. The guide groove plate assembly I and the guide groove plate assembly II are arranged opposite to each other. The L-shaped guide plate and the flat plate of the guide groove plate assembly I are fastened together to form a guide groove I. The L-shaped guide plate and the flat plate of the guide groove plate assembly II are fastened together to form a guide groove II. The guide groove I and the guide groove II are opposite to each other and are connected to form a guide groove.

[0011] Furthermore, the automatic calibration device also includes a pneumatic valve station, which is connected to the cylinder through two air pipes. An electromagnetic pneumatic valve is provided on the pneumatic valve station to control the lifting and lowering of the cylinder. A pressure switch I and a pressure switch II are also provided on the pneumatic valve station. The pressure switch I is connected to the rod cavity of the cylinder for measuring the rod cavity circuit pressure of the cylinder, and the pressure switch II is connected to the rodless cavity of the cylinder for measuring the rodless cavity circuit pressure of the cylinder.

[0012] Furthermore, there are 11 rollers below the front guide, and the gap between each two rollers is 80 mm. Automatic calibration devices are installed under the 1st and 2nd, and the 10th and 11th rollers respectively, and the center line of the calibration plate coincides with the rolling center line; the calibration plate is 1000 mm long, 60 mm thick, and 800 mm high.

[0013] Furthermore, the front guide includes a guide, a hydraulic cylinder and a servo system. The guide is divided into an operating side guide and a transmission side guide, which is installed above the roller in front of the pinch roller. Hydraulic cylinders are configured at the inlet and outlet of the guide on each side. The two hydraulic cylinders on each side are synchronized by a mechanical connecting rod, and two pressure sensors are provided on each side for measuring the pressure of the rod cavity and the pressure of the rodless cavity.

[0014] Based on the above-mentioned automatic calibration device for the front guide of a hot rolling coiler, the present invention also relates to an automatic calibration method for the front guide of a hot rolling coiler, wherein the automatic calibration method is:

[0015] S1. Open the two side guides of the front guide to the maximum position;

[0016] S2. After the roller gaps on both sides of the guide reach their maximum position, pre-calibrate the roller gaps on both sides to L0. The value of L0 is generally slightly larger than half the roller length.

[0017] S3. After pre-calibrating the opening of both sides of the guide to L0, the pneumatic valve a in the solenoid pneumatic valve is energized, and the movable rod of the cylinder extends to lift the calibration plate to its highest position.

[0018] S4. After the calibration plate has been raised to its highest position, the servo valves on both sides of the control guide are simultaneously closed at a speed of 30 mm / s. The guides on both sides of the front guide are closed inward, with the target opening position being 530 mm.

[0019] S5. After the guides on both sides reach an opening of 530 mm, they are slowly closed at a speed of 2 mm / s. The guides on both sides continue to move toward the rolling centerline.

[0020] S6. After entering the slow closing process, when the guide closing speed has just stabilized at 2 mm / s, the guides on both sides begin measuring the no-load resistance of the guides during the slow closing process.

[0021] S7. The guides on both sides travel slightly different distances, and one guide will touch the calibration plate first. When the actual pressure on one guide exceeds 4 kN, the servo valve on that side immediately stops outputting, meaning the guide stops moving. The other guide continues to approach the calibration plate. When the other guide also detects a pressure of 4 kN, the servo valves on both guides switch to pressure control mode, setting the target pressure on both sides to 10 kN.

[0022] S8. The guides on both sides continue to move closer to the calibration plate. After the guide pressure on both sides reaches the target value within the range of 9 kN-11 kN and remains within this range for 2 seconds, the current position of both guides is calibrated to 500 mm.

[0023] S9. After the guide roller gap calibration is written, open the guide rollers on both sides to their maximum position. When both guide rollers reach their maximum position, the pneumatic valve B in the electromagnetic pneumatic valve is energized, causing the active rod of the cylinder to retract, lowering the calibration plate.

[0024] S10. When it is detected that the voltage drops to the lowest level, the calibration cycle ends.

[0025] Furthermore, the calculation method of the no-load resistance in S6 is:

[0026] The formula for testing the guide pressure F on each side is: F = S P ×P P -S R ×P R ,

[0027] Where: S P is the cross-sectional area of ​​the rodless cavity, S Ris the cross-sectional area of ​​the rod cavity, P P is the rodless chamber pressure, P R is the rodless cavity pressure;

[0028] Set the operating side guide pressure detection value to F os , the transmission side guide pressure detection value is F ds , F os and F ds These are all instantaneous detection values. In order to accurately determine the actual pressure when the subsequent guide is pressed against the calibration plate, it is necessary to measure the average resistance in the moving state.

[0029] Average resistance of the guide on the operating side:

[0030] Where: t0 is 1 second after the start of slow movement; t1 is 0.5 seconds after t0; F aos is the average resistance of the operating side guide; then the actual pressure applied by the operating side guide to the calibration plate is: F cos =F os -F aos ;

[0031] Average resistance of transmission side guide:

[0032] Among them, t0 is 1s after the start of slow movement; t1 is 0.5s after t0; F dos is the average resistance of the transmission side guide; then the actual pressure applied by the transmission side guide to the calibration plate is F cds =F ds -F ads .

[0033] Furthermore, whether the calibration plate is lifted to the highest position in S3 is confirmed by the following method:

[0034] a. Set the detection threshold of pressure switch I to 4 bar;

[0035] b. Under normal circumstances, it takes 3 seconds for the calibration plate to be raised from the lowest position to the highest position. In the control program, the timer starts when the pneumatic valve a in the electromagnetic pneumatic valve is energized. If a pressure signal is detected within 2.5 seconds, it is determined that the calibration plate is blocked by foreign matter and the calibration is terminated. If a pressure signal is detected after 2.5 seconds, it is determined that the calibration plate has been raised to the highest position.

[0036] Whether the calibration plate has dropped to the lowest position in S10 is confirmed by the following method:

[0037] a. Set the detection threshold of the descending position pressure switch II to 4 bar;

[0038] b. Under normal circumstances, it takes 3 seconds for the calibration plate to drop from the highest position to the lowest position. In the control program, the timing starts after the pneumatic valve b in the electromagnetic pneumatic valve is energized. If a pressure signal is detected within 2.5 seconds, it is determined that the calibration plate is blocked by foreign matter and the calibration is terminated. If a pressure signal is detected after 2.5 seconds, it is determined that the calibration plate has dropped to the lowest position.

[0039] The advantages of adopting the technical solution of the present invention are:

[0040] 1. The present invention provides a device and method for automatically calibrating the leading guide of a hot rolling coiler. This device safely, efficiently, and accurately calibrates the leading guide opening of the coiler with a single click, eliminating the need for manual intervention and thus avoiding potential safety hazards and improving safety. The entire calibration process is highly efficient, time-efficient, and accurate.

[0041] 2. The calibration device of the present invention is equipped with a calibration plate that can be lifted and lowered, and the calibration plate is driven by a cylinder to lift and lower. When the guide guards need to be calibrated, the cylinders of the two calibration devices simultaneously push the two calibration plates from the gap between the rollers to a high position, and then the guide guards on both sides are closed from the maximum opening, and stop after contacting the calibration plate. At this time, the PLC writes the opening of the guide guards on both sides as half the width of the calibration plate, that is, 500mm, and the calibration is completed; the operation is simple and convenient, and the safety is high. After the guide guards are opened to a safe position, the calibration plate drops below the center line of the roller and can be put into normal production without affecting the passage of the strip on the roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0043] Figure 1 It is a structural diagram of the leading guard;

[0044] Figure 2 This is a schematic diagram of the lifting state of the calibration plate in the automatic calibration device of the present invention;

[0045] Figure 3 Schematic diagram of the falling state of the calibration plate in the automatic calibration device of the present invention;

[0046] Figure 4 This is a schematic diagram of the main view of the automatic calibration device of the present invention;

[0047] Figure 5 This is a top view schematic diagram of the automatic calibration device of the present invention;

[0048] Figure 6 It is a side view schematic diagram of the automatic calibration device of the present invention;

[0049] Figure 7 This is a schematic diagram of the automatic calibration device of the present invention being installed in a state where the leading guard calibration plate falls;

[0050] Figure 8 This is a schematic diagram of the automatic calibration device of the present invention installed in the state where the leading guard calibration plate is lifted;

[0051] Figure 9 This is a pneumatic principle diagram of the automatic calibration device of the present invention;

[0052] Figure 10 This is a schematic diagram of the main view of the pneumatic valve station;

[0053] Figure 11 It is a side view of the pneumatic valve station.

[0054] The marks in the above figure are: 1. Calibration plate; 2. Cylinder; 3. Basic base; 4. Guide groove plate assembly I; 5. Guide groove plate assembly II; 6. Guide groove; 7. Wear-resistant plate; 8. L-shaped guide plate; 9. Flat plate; 12. Solenoid pneumatic valve; 121. Pneumatic valve a; 122. Pneumatic valve b; 13. Pressure switch I; 14. Pressure switch II. DETAILED DESCRIPTION

[0055] In the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "planar direction", "circumferential", etc., which indicate orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation; be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0056] The basic structure and configuration of the front guide of the coiler of the present invention are the same as those of the existing coiler. Figure 1As shown: the front guide includes a guide, a hydraulic cylinder and a servo system. The guide is divided into an operating side guide 01 and a transmission side guide 02, which are installed above the roller table in front of the pinch roller. Hydraulic cylinders are configured at the inlet and outlet of the guide on each side. The two hydraulic cylinders on each side are synchronized by a mechanical connecting rod. Two pressure sensors are installed on each side to measure the pressure in the rod cavity and the rodless cavity. Specifically, the hydraulic cylinder includes a transmission side inlet hydraulic cylinder 06, a transmission side outlet hydraulic cylinder 07, an operating side inlet hydraulic cylinder 08, and an operating side outlet hydraulic cylinder 09. A synchronous connecting rod 010 is provided between the movable rods of the transmission side inlet hydraulic cylinder 06 and the transmission side outlet hydraulic cylinder 07, and a synchronous connecting rod 010 is also provided between the movable rods of the operating side inlet hydraulic cylinder 08 and the operating side outlet hydraulic cylinder 09; the pressure sensor includes a transmission side rodless cavity pressure sensor 011, a transmission side rod cavity pressure sensor 012, an operating side rodless cavity pressure sensor 013, and an operating side rod cavity pressure sensor 014; the servo system includes a transmission side servo system 04 and an operating side servo system 05; a transmission side outlet hydraulic cylinder 07 is provided with a transmission side displacement sensor 015, and an operating side outlet hydraulic cylinder 09 is provided with an operating side displacement sensor 016.

[0057] The guide consists of a guide beam and a wear-resistant plate installed on the inner side of the guide beam. It is installed above the roller table in front of the pinch roller and is divided into an operating side guide and a transmission side guide. Each side of the guide is equipped with two hydraulic cylinders at the inlet and outlet. One displacement sensor and two pressure sensors are installed in the outlet hydraulic cylinder on each side. The hydraulic cylinders on each side are synchronized by a mechanical connecting rod.

[0058] The function of the displacement sensor is to display the current moving position of the hydraulic cylinder. Generally, after it is installed in the hydraulic cylinder, a hydraulic cylinder stroke calibration is performed. Generally, when the hydraulic cylinder is fully retracted, the displacement sensor is calibrated to S1=0mm. After it is put into normal operation, no further calibration is required.

[0059] In order to realize the automatic calibration of the leading guard, the present invention provides an automatic calibration device for the leading guard of a hot rolling coiler. The inlet and outlet of the leading guard are both provided with automatic calibration devices. The center line of the automatic calibration device coincides with the rolling center line. The automatic calibration device includes a calibration plate 1, a cylinder 2 and a base base 3. The base base 3 is installed on the equipment foundation. The fixed end of the cylinder 2 is installed on the base base 3. The calibration plate 1 is connected to the piston rod end of the cylinder 2 by fasteners. The calibration plate 1 rises and falls with the extension and contraction of the cylinder 2. The cylinder 2 is located below the base base 3, and the calibration plate 1 is located above the base base 3. The base base 3 is provided with a through hole for the piston rod of the cylinder 2 to pass through. The piston rod of the cylinder 2 passes through the base base 3 and is connected to the bottom of the calibration plate 1. The equipment foundation refers to the installation foundation of the hot rolling coiler, such as the I-beam supporting the leading guard.

[0060] There are 11 rollers 017 below the leading guard, with a gap of 80 mm between each two rollers. Automatic calibration devices are installed under the 1st and 2nd, and the 10th and 11th rollers respectively. The center line of the calibration plate 1 coincides with the rolling center line; the calibration plate 1 is 1000 mm long, 60 mm thick and 800 mm high.

[0061] The calibration device features a 1000mm-long calibration plate that can be raised and lowered, driven by a pneumatic cylinder. When the guides need to be calibrated, the cylinders of the two calibration devices simultaneously push the two calibration plates up from the gap between the rollers to the highest position. The guides on both sides then close from their maximum opening, stopping when they contact the calibration plates. The PLC then writes the opening of both guides to half the width of the calibration plates, or 500mm, completing the calibration. After the guides are opened to a safe position, the calibration plates descend below the centerline of the rollers, allowing normal production to resume without affecting the passage of the strip on the rollers.

[0062] The automatic calibration device also includes a guide groove plate assembly I4 and a guide groove plate assembly II5. The guide groove plate assembly I4 and the guide groove plate assembly II5 are installed on the basic base 3 to form a guide groove 6 for guiding the calibration plate 1. The calibration plate 1 is located in the guide groove 6. The calibration plate 1 moves up and down in the guide groove 6 following the extension and contraction of the cylinder 2.

[0063] Wear-resistant plates 7 are provided inside both ends of the guide groove 6. The wear-resistant plates 7 are installed on both sides of the width direction of the inner hole of the guide groove to accurately control the position of the calibration plate 1. The two ends of the calibration plate 1 are in contact with the wear-resistant plates 7 respectively.

[0064] Guide trough assembly I4 and guide trough assembly II5 have the same structure and both include an L-shaped guide plate 8 and a flat plate 9. Guide trough assembly I4 and guide trough assembly II5 are arranged opposite each other. The L-shaped guide plate 8 and flat plate 9 of guide trough assembly I4 are fastened together by fasteners to form guide trough I. The L-shaped guide plate 8 and flat plate 9 of guide trough assembly II5 are fastened together by fasteners to form guide trough II. Guide trough I and guide trough II are opposite and connected to each other to form guide trough 6. A wear-resistant plate 7 is provided inside the ends of guide troughs I and II that are away from each other. Wear-resistant plate 7 is mounted on L-shaped guide plate 8 and is a self-lubricating copper plate. A flange 10 is provided on the side where the L-shaped guide plate 8 and flat plate 9 are connected to the base 3. The flange 10 is provided with a mounting hole. The L-shaped guide plate 8 and flat plate 9 are fixedly connected to the base 3 by bolts that cooperate with the mounting holes.

[0065] Specifically, the basic base is installed on the foundation of the equipment, and plays a role in fixing and positioning the calibration device. The guide groove plates are bolted together to form a guide groove with a rectangular square hole in the middle, which is fixed to the basic base by bolts. The two wear-resistant plates are self-lubricating copper plates, which are installed on both sides of the width direction of the inner hole of the guide groove to accurately control the position of the guide plate. The calibration plate is fixed to the end of the cylinder piston rod by a pin and installed in the guide groove. Its position in the front, back, left and right directions is fixed. Under the constraint of the guide groove, it can only rise and fall with the extension and contraction of the cylinder. The cylinder is installed on the base plate, and the head of the cylinder piston rod is connected to the calibration plate. It is controlled by the pneumatic valve station to push the calibration plate up and down.

[0066] The automatic calibration device also includes a pneumatic valve station, which is connected to cylinder 2 via two air pipes. A solenoid pneumatic valve 12 is installed on the pneumatic valve station to control the raising and lowering of cylinder 2, thereby pushing the calibration plate up and down. The pneumatic valve station is also equipped with pressure switch I 13 and pressure switch II 14. Pressure switch I 13 is connected to the rod chamber of cylinder 2 to measure the pressure in the rod chamber circuit of cylinder 2. Pressure switch II 14 is connected to the rodless chamber of cylinder 2 to measure the pressure in the rodless chamber circuit of cylinder 2. Solenoid pneumatic valve 12, pressure switch I 13, and pressure switch II 14 are all connected to the corresponding input signal templates of the PLC system.

[0067] Based on the above-mentioned automatic calibration device for the front guide of a hot rolling coiler, the present invention also provides an automatic calibration method for the front guide of a hot rolling coiler. The automatic calibration method is as follows: first, an automatic calibration button is set on the main console HMI, and the PLC program is edited to implement the button function; after the operator presses the button, the automatic calibration control process is activated. The specific operation is as follows:

[0068] S1. Open the two side guides of the front guide to the maximum position; the method for determining whether it is opened to the maximum position is that the stroke S1 of the hydraulic cylinders on both sides is ≤ 5mm, measured by the displacement sensor, that is, it is close to being fully retracted.

[0069] S2. After the roller gaps on both sides of the guide are adjusted to their maximum positions, pre-calibrate the roller gaps on both sides to L0. The value of L0 is generally slightly larger than half the roller length. Pre-calibration is not a precise calibration and is intended to facilitate automatic position control during the calibration process.

[0070] S3. After the opening degree on both sides of the guide is pre-calibrated to L0, the pneumatic valve a121 in the solenoid pneumatic valve 12 is triggered and the active rod of the cylinder 2 is extended to lift the calibration plate 1 to the highest position;

[0071] Whether the calibration plate has been lifted to the highest position can be confirmed by the following methods:

[0072] a. Set the detection threshold of pressure switch Ⅰ13 to 4 bar;

[0073] b. Under normal circumstances, it takes 3 seconds for the calibration plate to rise from the lowest position to the highest position. In the control program, the timing starts after the pneumatic valve a121 in the electromagnetic pneumatic valve 12 is energized. If a pressure signal is detected within 2.5 seconds, it is determined that the calibration plate is blocked by foreign matter and the calibration is terminated. If a pressure signal is detected after 2.5 seconds, it is determined that the calibration plate has been raised to the highest position.

[0074] S4. After the calibration plate 1 has been lifted to the highest position, the servo valves on both sides of the control guide are quickly closed at a speed of 30 mm / s at the same time, and the guides on both sides of the front guide are closed inward, with the target value being the opening position of 530 mm.

[0075] S5. After the guides on both sides reach an opening of 530mm, they are closed slowly at a speed of 2mm / s, and the guides on both sides continue to move toward the rolling center line.

[0076] S6. After entering the slow closing process, when the closing speed of the guide guards is basically stable at 2mm / s, the guide guards on both sides begin to measure the no-load resistance of the guide guards during the slow closing process. The calculation method of the no-load resistance is:

[0077] The formula for testing the guide pressure F on each side is: F = S P ×P P -S R ×P R ,

[0078] Where: S P is the cross-sectional area of ​​the rodless cavity, S R is the cross-sectional area of ​​the rod cavity, P P is the rodless chamber pressure, P R is the rodless cavity pressure;

[0079] Set the operating side guide pressure detection value to F os , the transmission side guide pressure detection value is F ds , F os and F ds These are all instantaneous detection values. In order to accurately determine the actual pressure when the subsequent guide is pressed against the calibration plate, it is necessary to measure the average resistance in the moving state.

[0080] Average resistance of the guide on the operating side:

[0081] Where: t0 is 1 second after the start of slow movement; t1 is 0.5 seconds after t0; F aos is the average resistance of the operating side guide; then the actual pressure applied by the operating side guide to the calibration plate is: F cos =F os -F aos ;

[0082] Average guide resistance on the transmission side:

[0083] Among them, t0 is 1s after the start of slow movement; t1 is 0.5s after t0; F dos is the average resistance of the transmission side guide; then the actual pressure applied by the transmission side guide to the calibration plate is F cds =F ds -F ads .

[0084] S7. The running distance of the guide guards on both sides is slightly different. The guide guard on one side will touch the calibration plate 1 first. When the actual pressure of the guide guard on one side (F cds or F cos ) exceeds 4kN, the servo valve on that side immediately stops output, and the guide on that side stops moving. This operation is intended to prevent excessive pressure on one side from damaging the calibration plate. The guide on the other side continues to approach the calibration plate. When the guide on the other side also detects a pressure of 4kN, the servo valve control of both guides switches to pressure control mode, and the target pressure value on both sides is set to 10kN.

[0085] S8. The guides on both sides continue to approach the calibration plate. When the pressure of the guides on both sides reaches the target value of about 10KN (with a deviation of 1KN), that is, the pressure of the guides on both sides reaches the target value within the range of 9KN-11KN and lasts for 2s, the current position of the guides on both sides is calibrated to 500mm.

[0086] S9. After the guide roller gap calibration is written, open the guides on both sides to the maximum position (greater than L0); after the guides on both sides reach the maximum position, the pneumatic valve b122 in the electromagnetic pneumatic valve 12 is triggered to be energized, and the movable rod of the cylinder 2 contracts, causing the calibration plate to descend.

[0087] S10. When the detection drops to the lowest level, the calibration cycle ends;

[0088] Whether the calibration plate has dropped to the lowest position can be confirmed by the following methods:

[0089] a. Set the detection threshold of the descending position pressure switch Ⅱ14 to 4 bar;

[0090] b. Under normal circumstances, it takes 3 seconds for the calibration plate to drop from the highest position to the lowest position. In the control program, the timing starts after the pneumatic valve b122 in the electromagnetic pneumatic valve 12 is energized. If a pressure signal is detected within 2.5 seconds, it is determined that the calibration plate is blocked by foreign matter and the calibration is terminated. If a pressure signal is detected after 2.5 seconds, it is determined that the calibration plate has dropped to the lowest position.

[0091] The present invention provides a device and method for automatically calibrating the leading guide of a hot rolling coiler. These devices safely, efficiently, and accurately calibrate the leading guide opening of the coiler with a single click, eliminating the need for manual intervention and thus avoiding potential safety hazards and improving safety. The entire calibration process is highly efficient, time-efficient, and accurate.

[0092] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A method for automatic calibration of a hot rolling coiler front guide, characterized by: The invention comprises an automatic calibration device, wherein the inlet and outlet of the front guide are both provided with the automatic calibration device, the center line of the automatic calibration device coincides with the rolling center line, the automatic calibration device comprises a calibration plate (1), a cylinder (2) and a base base (3), the base base (3) is installed on the equipment base, the fixed end of the cylinder (2) is installed on the base base (3), the calibration plate (1) is connected to the piston rod end of the cylinder (2) through a fastener, and the calibration plate (1) rises and falls following the extension and contraction of the cylinder (2); The automatic calibration device also includes a pneumatic valve station, which is connected to the cylinder (2) through two air pipes. The pneumatic valve station is provided with an electromagnetic pneumatic valve (12) to control the lifting and lowering of the cylinder (2). The pneumatic valve station is also provided with a pressure switch I (13) and a pressure switch II (14). The pressure switch I (13) is connected to the rod cavity of the cylinder (2) for measuring the pressure of the rod cavity circuit of the cylinder (2). The pressure switch II (14) is connected to the rodless cavity of the cylinder (2) for measuring the pressure of the rodless cavity circuit of the cylinder (2). The automatic calibration method is: S1. Open the two side guides of the front guide to the maximum position; S2. After the roller gaps on both sides of the guide reach their maximum position, pre-calibrate the roller gaps on both sides to L0. The value of L0 is generally slightly larger than half the roller length. S3. After the opening degree of the guide on both sides is pre-calibrated to L0, the pneumatic valve a (121) in the electromagnetic pneumatic valve (12) is energized, and the active rod of the cylinder (2) extends to lift the calibration plate (1) to the highest position; S4. After the calibration plate (1) has been raised to the highest position, the servo valves on both sides of the control guide are quickly closed at a speed of 30 mm / s, and the guides on both sides of the front guide are closed inward, with the target opening position being 530 mm. S5. After the guides on both sides reach an opening of 530 mm, they are slowly closed at a speed of 2 mm / s. The guides on both sides continue to move toward the rolling centerline. S6. After entering the slow closing process, when the guide closing speed has just stabilized at 2 mm / s, the guides on both sides begin measuring the no-load resistance of the guides during the slow closing process. S7. The running distances of the two guides are slightly different. One guide will touch the calibration plate (1) first. When the actual pressure of the guide on one side exceeds 4 kN, the servo valve on that side immediately stops outputting, i.e. the guide on that side stops moving. The guide on the other side continues to approach the calibration plate. When the guide on the other side also detects a pressure of 4 kN, the servo valves on both guides switch to pressure control mode. At this time, the target pressure values ​​on both sides are set to 10 kN. S8. The guides on both sides continue to move closer to the calibration plate. After the guide pressure on both sides reaches the target value within the range of 9 kN-11 kN and remains within this range for 2 seconds, the current position of both guides is calibrated to 500 mm. S9. After the guide roller gap calibration is written, open the guides on both sides to the maximum position; after the guides on both sides reach the maximum position, the pneumatic valve b (122) in the electromagnetic pneumatic valve (12) is energized, and the active rod of the cylinder (2) is retracted, causing the calibration plate to drop; S10. When it is detected that the calibration plate has dropped to the lowest position, the calibration cycle ends.

2. The method for automatic calibration of a front guide of a hot rolling coiler according to claim 1, characterized in that: The automatic calibration device further comprises a guide groove plate assembly I (4) and a guide groove plate assembly II (5). The guide groove plate assembly I (4) and the guide groove plate assembly II (5) are mounted on a base base (3) to form a guide groove (6) for guiding the calibration plate (1). The calibration plate (1) is located in the guide groove (6). The calibration plate (1) moves up and down in the guide groove (6) following the extension and contraction of the cylinder (2).

3. The method for automatic calibration of a front guide of a hot rolling coiler according to claim 2, characterized in that: Wear-resistant plates (7) are provided inside both ends of the guide groove (6). The wear-resistant plates (7) are installed on both sides of the width direction of the inner hole of the guide groove and are used to accurately control the position of the calibration plate (1). The two ends of the calibration plate (1) are respectively in contact with the wear-resistant plates (7).

4. A method for automatically calibrating a front guide of a hot rolling coiler according to claim 2 or 3, characterized in that: The guide groove plate assembly I (4) and the guide groove plate assembly II (5) have the same structure and both include an L-shaped guide plate (8) and a flat plate (9). The guide groove plate assembly I (4) and the guide groove plate assembly II (5) are arranged relative to each other. The L-shaped guide plate (8) and the flat plate (9) of the guide groove plate assembly I (4) are fastened together to form a guide groove I. The L-shaped guide plate (8) and the flat plate (9) of the guide groove plate assembly II (5) are fastened together to form a guide groove II. The guide groove I and the guide groove II are opposite to each other and are connected to each other to form a guide groove (6).

5. The method for automatic calibration of a front guide of a hot rolling coiler according to claim 4, characterized in that: There are 11 rollers below the front guide, and the gap between each two rollers is 80mm. Automatic calibration devices are installed below the first and second rollers, and the tenth and eleventh rollers respectively, and the center line of the calibration plate (1) coincides with the rolling center line; the calibration plate (1) is 1000mm long, 60mm thick, and 800mm high.

6. The method for automatic calibration of a front guide of a hot rolling coiler according to claim 5, characterized in that: The front guide includes a guide, a hydraulic cylinder and a servo system. The guide is divided into an operating side guide and a transmission side guide, and is installed above the roller in front of the pinch roller. Hydraulic cylinders are configured at the inlet and outlet of the guide on each side. The two hydraulic cylinders on each side are synchronized by a mechanical connecting rod. Two pressure sensors are provided on each side for measuring the pressure of the rod cavity and the pressure of the rodless cavity.

7. The method for automatic calibration of a front guide of a hot rolling coiler according to claim 1, characterized in that: The calculation method of the no-load resistance in S6 is: The formula for testing the guide pressure F on each side is: F = S P ×P P -S R ×P R , Where: S P is the cross-sectional area of ​​the rodless cavity, S R is the cross-sectional area of ​​the rod cavity, P P is the rodless chamber pressure, P R is the rodless cavity pressure; Set the operating side guide pressure detection value to F os , the transmission side guide pressure detection value is F ds , F os and F ds These are all instantaneous detection values. In order to accurately determine the actual pressure when the subsequent guide is pressed against the calibration plate, it is necessary to measure the average resistance in the moving state. Average resistance of the operating side guide: Where: t0 is 1 second after the start of slow movement; t1 is 0.5 seconds after t0; F aos is the average resistance of the operating side guide; then the actual pressure applied by the operating side guide to the calibration plate is: F cos =F os -F aos ; Average resistance of transmission side guide: Among them, t0 is 1s after the start of slow movement; t1 is 0.5s after t0; F dos is the average resistance of the transmission side guide; then the actual pressure applied by the transmission side guide to the calibration plate is F cds =F ds -F ads .

8. The method for automatic calibration of a front guide of a hot rolling coiler according to claim 1, characterized in that: Whether the calibration plate in S3 has been lifted to the highest position is confirmed by the following method: a. Set the detection threshold of pressure switch Ⅰ (13) to 4 bar; b. Under normal circumstances, it takes 3 seconds for the calibration plate to be raised from the lowest position to the highest position. In the control program, the timer starts after the pneumatic valve a (121) in the electromagnetic pneumatic valve (12) is energized. If a pressure signal is detected within 2.5 seconds, it is determined that the calibration plate is blocked by foreign matter and the calibration is terminated. After 2.5 seconds, the pressure signal is detected, and it is determined that the calibration plate has been lifted to the highest position; In S10, whether the calibration plate has dropped to the lowest position is confirmed by the following method: a. Set the detection threshold of the descending position pressure switch Ⅱ (14) to 4 bar; b. Under normal circumstances, it takes 3 seconds for the calibration plate to descend from the highest position to the lowest position. In the control program, the timer starts after the pneumatic valve b (122) in the electromagnetic pneumatic valve (12) is energized. If a pressure signal is detected within 2.5 seconds, it is determined that the calibration plate is blocked by foreign matter and the calibration is terminated. After 2.5 seconds, the pressure signal is detected, and it is determined that the calibration plate has dropped to the lowest position.

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