A control method for the short steel plate clamping tail of a horizontal rolling mill and a rolling line

Abstract

This invention discloses a control method for the tail clamping of short steel plates in a horizontal rolling mill. A first hot metal detector is installed at the inlet of the descaling box; a second hot metal detector is installed at the outlet of the reversible roughing mill; the tail clamping area of ​​the horizontal vertical rolling mill is divided for steel plate position tracking; based on the head position information of the clamped steel plate obtained by the vertical rolling mill PLC, the main PLC sets the vertical rolling mill operating mode and performs rolling on the steel plate using the vertical rolling mill operating mode. This invention also discloses a rolling line for the tail clamping of short steel plates in a horizontal rolling mill. This invention improves the effectiveness of the tail clamping action of the horizontal vertical rolling mill, thereby improving the planar shape of the short steel plate to cut medium-thick steel plates with the maximum yield, reducing cutting losses, and effectively improving the steel plate yield.

Description

Technical Field

[0001] This invention relates to automated control technology for cooling of thick plates, and more specifically, to a control method and rolling line for short steel plate clamping tails in horizontal rolling mills. Background Technology

[0002] The production process site of the 5m thick plate vertical rolling mill in the steel enterprise is located in the area between descaling box 1 and reversible roughing mill 2, such as... Figure 1 As shown, the horizontal vertical roll mill 3 is located at the entrance of the reversible roughing mill 2. The horizontal vertical roll mill 3 is driven by a vertically placed AC motor through a helical spur gear and a vertical universal joint, and has roll bearing housings with the rolls installed, an upper gearbox, a pressing system, and a roll balancing system.

[0003] The horizontal vertical roll mill (3) is a crucial piece of equipment in the production of medium and heavy steel plates. It primarily addresses the planar shape issues encountered during the widening and finishing stages of the roughing mill, improving the plate's planar shape to maximize the yield of medium and heavy steel plates, reducing cutting losses, and effectively increasing the overall steel plate yield. The automatic control of the vertical roll mill includes preset modes, tail-clamping, and operating modes. The tail-clamping mechanism of the horizontal vertical roll mill works by calculating the roll gap position based on the steel plate information and setting the rolling parameters during the penultimate pass of the roughing mill.

[0004] To improve rolling efficiency, the rolling rhythms of the horizontal vertical roll mill 3 and the reversible roughing mill 2 need to be highly coordinated. However, in actual production, when using the tail-clamping mode of the horizontal vertical roll mill 3 for some short steel plates, there is a mismatch between the vertical roll start-up setting sequence and the steel ejection speed. As a result, when the vertical roll start-up setting is in place, the short steel plate has already left the working area of ​​the horizontal vertical roll mill 3, failing to achieve the effective tail-clamping function for short steel plates. In particular, the effect on eliminating the head and tail bulge of the steel plate is not obvious. Figure 2 As shown.

[0005] Further analysis of the problems mentioned above reveals that, in the tail-clamping mode, the starting sequence and reverse pass steel throwing speed of the horizontal vertical roll mill 3 are set too fast and are unreasonable. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a control method and rolling line for the clamping tail of short steel plates in horizontal rolling mills, thereby improving the effectiveness of the clamping tail action in horizontal vertical rolling mills, improving the planar shape of short steel plates, cutting out medium-thick steel plates with the maximum yield, reducing cutting losses, and effectively improving the steel plate yield.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The first aspect of this invention provides a control method for the tail of short steel plates in a horizontal rolling mill:

[0009] A first hot metal detector is installed at the inlet of the descaling box;

[0010] A second hot metal detector is installed at the exit position of the reversible roughing mill;

[0011] The clamping area of ​​the horizontal vertical roll mill is divided for steel plate position tracking.

[0012] Based on the head position information of the steel plate obtained by the vertical roll PLC of the horizontal vertical roll mill, the main PLC sets the vertical roll working mode and performs vertical roll rolling on the steel plate.

[0013] Preferably, the control method specifically includes the following steps:

[0014] S1. The vertical roller PLC calculates the final set roller gap of the vertical roller based on the steel plate information;

[0015] S2. Determine whether the distance to the exit position of the reversible roughing mill is greater than L3; if yes, proceed to step S3; otherwise, wait.

[0016] S3. Determine whether the head position of the clamping steel plate is less than L2. If yes, proceed to step S4; otherwise, wait.

[0017] S4. The main PLC sends a command to the vertical roll PLC to use the vertical roll mill tail clamping action; and determines whether the head position of the clamped steel plate is greater than L1. If not, wait; if so, enter the rough rolling reverse pass and reduce the steel throwing reverse speed by half.

[0018] S5. The horizontal vertical roll mill begins operation.

[0019] S6. Determine whether the horizontal vertical roll mill has moved to the target position. If yes, proceed to step S7; otherwise, return to step S5.

[0020] S7. Wait for the vertical roll to be fed into the steel clamp for rolling;

[0021] S8. When all other conditions for roughing reverse pass steel throwing are met, the vertical rolls feed steel and begin tail-end rolling.

[0022] S9. The reverse steel throwing process ends, and the steel plate clamping action is completed.

[0023] S10, other steel feeding conditions are met, and the vertical roll begins working mode rolling;

[0024] S11, the steel throwing process in the main rolling cycle ends, and the vertical roll working mode rolling is completed;

[0025] S12. Wait for the next steel plate to be rolled by vertical rollers.

[0026] Preferably, in step S2, L3 is the distance between the second hot metal detector and the exit side guide plate of the reversible roughing mill.

[0027] Preferably, in step S3, L2 is the distance between the first hot metal detector and the second hot metal detector.

[0028] Preferably, in step S4, L1 is the distance between the first hot metal detector and the center line of the archway of the horizontal vertical roll mill.

[0029] A second aspect of the present invention provides a rolling line for short steel plate clamping tails in a horizontal rolling mill, comprising a descaling box, a horizontal vertical roll mill, and a reversible roughing mill arranged sequentially along the running direction of the steel plate;

[0030] A first hot metal detector is installed at the inlet of the descaling box;

[0031] A second hot metal detector is installed at the exit position of the reversible roughing mill;

[0032] The rolling line implements the control method for short steel plate clamping tail of a horizontal rolling mill provided by the first aspect of the present invention.

[0033] This invention provides a control method and rolling line for the clamping tail of short steel plates in a horizontal rolling mill. It avoids the defects of existing technologies, improves the effectiveness of the clamping tail action in horizontal vertical rolling mills, and improves the planar shape of the steel plate to cut medium-thick steel plates with the maximum yield, reducing cutting losses and effectively increasing the steel plate yield. It also enhances the linkage between the roughing mill and the horizontal vertical rolling mill, further improving the rolling rhythm efficiency. It can be applied to the clamping tail control of similar wide and thick plate horizontal vertical rolling mills and has broad application value. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the existing horizontal vertical roll mill layout.

[0035] Figure 2 This is a schematic diagram illustrating a situation where a steel plate fails to be clamped due to a delay in setting the position of an existing horizontal vertical roll mill.

[0036] Figure 3 This is a flowchart illustrating the control method of the present invention;

[0037] Figure 4 This is a schematic diagram of the arrangement of the hot metal detector in the control method of the present invention;

[0038] Figure 5 This is a schematic diagram illustrating the division of the steel plate position tracking in the tail region of the control method of the present invention. Detailed Implementation

[0039] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] Combination Figures 3 to 5 As shown, the present invention provides a control method for the tail clamping of short steel plates in a horizontal rolling mill:

[0041] A first hot metal detector 5 is installed at the inlet of the descaling box 4 (the physical position of the steel plate tracking starting point is set to 0m).

[0042] A second hot metal detector 7 is installed at the exit position of the reversible roughing mill 6 (installed at a physical location 53m away from the tracking start point).

[0043] The clamping area of ​​the horizontal vertical roll mill 8 is divided for steel plate position tracking, and the area is defined as follows:

[0044] L1 is the distance (46.22m) between the first hot metal detector 5 and the center line of the archway of the horizontal vertical rolling mill 8.

[0045] L2 is the distance (53m) between the first hot metal detector 5 and the second hot metal detector 7.

[0046] L3 is the distance (7m) between the second hot metal detector 7 and the exit side guide plate 9 of the reversible roughing mill 6.

[0047] Based on the position information of the head of the steel plate obtained by the vertical roll PLC of the horizontal vertical roll mill, the main PLC sets the vertical roll working mode and performs vertical roll rolling on the steel plate.

[0048] The control method of the present invention specifically includes the following steps:

[0049] S1. The vertical roller PLC calculates the final set roller gap based on the steel plate information.

[0050] S2. Determine whether the distance to the exit position of the reversible roughing mill 6 is greater than L3; if yes, proceed to step S3; otherwise, wait.

[0051] S3. Determine if the position of the head of the clamping steel plate is less than L2. If yes, proceed to step S4; otherwise, wait.

[0052] S4. The main PLC sends a command to the vertical roll PLC to use the vertical roll mill to clamp the tail. It then determines whether the head position of the clamped steel plate is greater than L1. If not, it waits. If so, it enters the roughing rolling reverse pass and the steel throwing reverse speed setting is halved.

[0053] S5, Horizontal vertical roll mill 8 starts operating;

[0054] S6. Determine whether the horizontal vertical roll mill 6 has moved to the target position. If yes, proceed to step S7; otherwise, return to step S5.

[0055] S7. Wait for the vertical roll to be fed into the steel clamp for rolling;

[0056] S8. When all other conditions for roughing reverse pass steel throwing are met, the vertical rolls feed steel and begin tail-end rolling.

[0057] S9. The reverse steel throwing process ends, and the steel plate clamping action is completed.

[0058] S10, other steel feeding conditions are met, and the vertical roll begins working mode rolling;

[0059] S11, the steel throwing process in the main rolling cycle ends, and the vertical roll working mode rolling is completed;

[0060] S12. Wait for the next steel plate to be rolled by vertical rollers.

[0061] The present invention also provides a rolling line for short steel plate clamping tail of a horizontal rolling mill, comprising a descaling box 4, a horizontal vertical roll mill 8 and a reversible roughing mill 6 arranged sequentially along the running direction of the steel plate.

[0062] A first hot metal detector 5 is installed at the inlet of the descaling box 4.

[0063] A second hot metal detector 7 is installed at the exit position of the reversible roughing mill 6.

[0064] The roller conveyor of the rolling mill of this invention is driven by a variable frequency motor, and the position tracking of the steel plate is achieved by speed integral calculation of the frequency converter.

[0065] Steel plate position tracking and correction are achieved through HMDs (hot metal detectors) deployed on-site. The process of correcting the head and tail positions of the steel plate, calculated theoretically by the PLC, to the positions of the on-site detection equipment is called automatic synchronization.

[0066] The present invention implements the control method for short steel plate clamping tail of horizontal rolling mill through the rolling line of the present invention.

[0067] Example

[0068] refer to Figure 5 As shown in this embodiment, a control method for the short steel plate clamping tail of a horizontal rolling mill is described:

[0069] A first hot metal detector 5 is installed at the inlet of the descaling box 4 (the physical position of the starting point for steel plate tracking is set to 0m).

[0070] A second hot metal detector 7 is installed at the exit position of the reversible roughing mill 6 (generally installed at a physical distance of 53m from the tracking start point).

[0071] The clamping area of ​​the horizontal vertical roll mill 8 is divided for steel plate position tracking, and the area is defined as follows:

[0072] L1 is the distance between the first hot metal detector 5 and the center line of the archway of the horizontal vertical rolling mill 8, L1 = 46.22m.

[0073] L2 is the distance between the first hot metal detector 5 and the second hot metal detector 7, L2 = 53m.

[0074] L3 is the distance between the second hot metal detector 7 and the exit side guide plate 9 of the reversible roughing mill 6, L3 = 7m.

[0075] Based on the head position information of the steel plate at the tail end obtained by the vertical roll PLC of the horizontal vertical roll mill, the main PLC sets the vertical roll working mode and performs vertical roll rolling on the steel plate. Specifically, this includes the following steps:

[0076] S1. The vertical roller PLC calculates the final set roller gap based on the steel plate information.

[0077] S2. Determine that the distance to the exit position of the reversible roughing mill 6 is greater than L3 (7m);

[0078] S3. Determine that the head position of the tail steel plate is less than L2 (53m);

[0079] S4. The main PLC sends a command to the vertical roll PLC to use the vertical roll mill tail clamping action; and determines that the head position of the clamped steel plate is greater than L1 (46.22m), and the reverse speed setting of the roughing mill reverse pass is halved.

[0080] S5, Horizontal vertical roll mill 8 starts operating;

[0081] S6. Determine if the horizontal vertical roll mill 6 has moved to the target position;

[0082] S7. Wait for the vertical roll to be fed into the steel clamp for rolling;

[0083] S8. When all other conditions for roughing reverse pass steel throwing are met, the vertical rolls feed steel and begin tail-end rolling.

[0084] S9. The reverse steel throwing process ends, and the steel plate clamping action is completed.

[0085] S10, other steel feeding conditions are met, and the vertical roll begins working mode rolling;

[0086] S11, the steel throwing process in the main rolling cycle ends, and the vertical roll working mode rolling is completed;

[0087] S12. Wait for the next steel plate to be rolled by vertical rollers.

[0088] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A control method for the tail clamping of short steel plates in a horizontal rolling mill, characterized in that: A first hot metal detector is installed at the inlet of the descaling box; A second hot metal detector is installed at the exit position of the reversible roughing mill; The clamping area of ​​the horizontal vertical roll mill is divided for steel plate position tracking. Based on the head position information of the steel plate with the tail end obtained by the vertical roll PLC of the horizontal vertical roll mill, the main PLC sets the vertical roll working mode and performs vertical roll working mode rolling on the steel plate. The control method specifically includes the following steps: S1. The vertical roller PLC calculates the final set roller gap of the vertical roller based on the steel plate information; S2. Determine whether the distance to the exit position of the reversible roughing mill is greater than L3; if yes, proceed to step S3; otherwise, wait. S3. Determine whether the head position of the clamping steel plate is less than L2. If yes, proceed to step S4; otherwise, wait. S4. The main PLC sends a command to the vertical roll PLC to use the vertical roll mill tail clamping action; and determines whether the head position of the clamped steel plate is greater than L1. If not, wait; if so, enter the rough rolling reverse pass and reduce the steel throwing reverse speed by half. S5. The horizontal vertical roll mill begins operation. S6. Determine whether the horizontal vertical roll mill has moved to the target position. If yes, proceed to step S7; otherwise, return to step S5. S7. Wait for the vertical roll to be fed into the steel clamp for rolling; S8. When all other conditions for roughing reverse pass steel throwing are met, the vertical rolls feed steel and begin tail-end rolling. S9. The reverse steel throwing process ends, and the steel plate clamping action is completed. S10, other steel feeding conditions are met, and the vertical roll begins working mode rolling; S11, the steel throwing process in the main rolling cycle ends, and the vertical roll working mode rolling is completed; S12. Wait for the next steel plate to be rolled by the vertical rolls; In step S2, L3 is the distance between the second hot metal detector and the exit side guide plate of the reversible roughing mill; In step S3, L2 is the distance between the first hot metal detector and the second hot metal detector; In step S4, L1 is the distance between the first hot metal detector and the center line of the archway of the horizontal vertical roll mill.

2. A rolling line for clamping short steel plates in a horizontal rolling mill, comprising a descaling box, a horizontal vertical rolling mill, and a reversible roughing mill arranged sequentially along the running direction of the steel plate, characterized in that: A first hot metal detector is installed at the inlet of the descaling box; A second hot metal detector is installed at the exit position of the reversible roughing mill; The rolling line implements the control method for short steel plate clamping tail of a horizontal rolling mill as described in claim 1.

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