A method for preventing a mill centering device from colliding and a wide and thick plate rolling line
By controlling the opening and movement of the pre-mill centering device, the problem of steel plates impacting the pre-mill centering device in heavy plate rolling mills has been solved, thus achieving mill safety and production stability, and reducing equipment failure and maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BAOSHAN IRON & STEEL CO LTD
- Filing Date
- 2024-12-10
- Publication Date
- 2026-06-12
AI Technical Summary
In the production of heavy plate rolling mills, when the width of the current steel plate is smaller than the width of the next steel plate to be rolled, the steel plate is prone to hitting the centering device in front of the machine, which can cause equipment damage, resulting in long-term downtime and increased maintenance costs.
By controlling the opening of the centering device at the front of the mill to the maximum width of the steel plate, and controlling the movements of the centering devices at the front and rear of the mill according to the rolling action of the mill, the steel plate is ensured to enter the mill smoothly and avoids impact.
This approach achieves the goal of improving rolling speed while protecting the safety of the mill alignment device, ensuring the stability of the rolling line production, avoiding equipment damage and prolonged downtime, and reducing maintenance costs.
Smart Images
Figure CN122184076A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of automated control technology for heavy plate rolling mills, and more specifically, to a method and line for controlling heavy plate rolling to prevent collisions with the mill centering device. Background Technology
[0002] The main equipment of the heavy plate rolling mill consists of the pre-mill centering device, the mill body, and the post-mill centering device. A schematic diagram of its on-site layout is shown below. Figure 1 As shown.
[0003] In steel companies, 5m wide and thick plate production lines have centering devices (such as...) arranged at relative positions before and after the rolling mill. Figure 2 (As shown). The working principle involves controlling the centering device to ensure the steel plate is aligned to the center during rolling. It is primarily used for guiding and centering the slab. It is an indispensable piece of equipment in the medium and heavy plate rolling mill production process. The opening degree is adjusted according to the PLC settings. The centering device is driven by a hydraulic cylinder. The actual opening position is measured by a displacement sensor installed inside the hydraulic cylinder, and the reading is displayed on the control panel for operator reference. Simultaneously, a pressure sensor is installed in the hydraulic system of the centering device. When the centering device clamps the steel plate and the hydraulic system pressure reaches the set value, the pressure sensor sends a signal, and the centering device opens, preventing the steel plate from being clamped into an arch shape. Once the steel plate is in place, the opening degree of the centering device is adjusted to be slightly larger than the width of the steel plate, and the rolling mill begins to bite and roll the steel.
[0004] However, in the pursuit of maximum production efficiency, after the steel plate leaves the mill's centering device after rolling, the mill's front guide plate receives information for the next steel plate. To improve the rolling rhythm, the next steel plate to be rolled enters the front centering device area. If the width of the current steel plate is smaller than that of the next steel plate to be rolled, an accident may occur where the steel plate collides with the front centering device, causing equipment damage. This will result in prolonged equipment downtime and significantly increase equipment maintenance costs. Summary of the Invention
[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a method and rolling line for controlling the rolling of wide and thick plates by preventing collisions with the mill centering device. This avoids accidents that occur when the width of the current steel plate is smaller than the width of the next steel plate to be rolled, which could lead to equipment damage, prolonged equipment downtime, and significantly increased equipment maintenance costs.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] The first aspect of the present invention provides a method for controlling the rolling of wide and thick plates to prevent impact from the centering device of the rolling mill;
[0008] Based on the current rolling action of the rolling mill, control the corresponding actions of the front and rear centering devices of the mill.
[0009] After the rolling mill completes the current rolling process of the steel plate, the opening of the mill centering device is set to the maximum specification steel plate width.
[0010] Then receive information about the next piece of steel plate to be rolled.
[0011] Preferably, the method for controlling the rolling of thick plates specifically includes the following steps:
[0012] S1, the rolling mill host computer model sends steel plate information;
[0013] S2, determine whether the main PLC of the rolling mill has received the steel plate information. If yes, proceed to step S3; otherwise, wait for the rolling mill host computer model to send the information.
[0014] S3, determine whether the rolling mill stand PLC has received the steel plate information. If yes, proceed to step S4; otherwise, wait for the rolling mill main PLC to send the information.
[0015] S4, the mill's front centering device is activated;
[0016] S5, determine whether the front alignment device has been activated. If yes, proceed to step S6; otherwise, wait for the front alignment device to activate.
[0017] S6, the rolling mill stand PLC sends a steel feeding completion signal to the rolling mill main PLC;
[0018] S7, the main PLC of the rolling mill checks whether the conditions for the next steel plate feed are met. If they are met, proceed to step S8; if they are not met, wait for the conditions for the next steel plate feed to be met.
[0019] S8, the rolling mill begins rolling steel plates;
[0020] S9, determine whether the steel biting rolling force of the rolling mill is greater than the set value, and whether the tail position of the steel plate at the steel ejection window is greater than the set value of the center position of the rolling mill. If yes, proceed to step S10; otherwise, wait for the rolling mill to roll the steel plate.
[0021] S10, the rolling mill begins to discard steel;
[0022] S11, the rolling pass of the rolling mill is automatically reversed once;
[0023] S12, the rear centering device of the rolling mill is positioned at the position of the front centering device;
[0024] S13, the main PLC of the rolling mill checks whether the conditions for the reverse pass of the steel plate are met. If they are met, proceed to step S14; if they are not met, wait for the conditions for the reverse pass of the steel plate to be met.
[0025] S14, the L1 system of the rolling mill executes the pass and roll gap control cycle set by the upper computer model of the rolling mill;
[0026] S15, the main PLC of the rolling line determines whether it is the last pass. If yes, proceed to step S16; otherwise, wait for the L1 system of the rolling mill to execute the pass and roll gap control rolling cycle set by the upper computer model of the rolling mill.
[0027] S16, the rolling mill begins to discard steel;
[0028] S17, determine whether the tail position of the rolled steel plate has left the center line of the rolling mill. If yes, proceed to step S18; otherwise, wait for the tail position of the rolled steel plate to leave the center line of the rolling mill.
[0029] S18, the opening degree of the front centering device is set to the position of the maximum specification steel plate width;
[0030] S19, the main PLC of the rolling line receives information about the next rolled steel plate.
[0031] A second aspect of the present invention provides a rolling mill line, including a rolling mill host computer model, a rolling mill line main PLC, and a rolling mill stand PLC;
[0032] The rolling mill host computer model sends steel plate information to the main PLC of the rolling line;
[0033] The rolling mill stand PLC receives the steel plate information transmitted by the rolling line main PLC;
[0034] The rolling line implements the wide and thick plate rolling control method provided by the first aspect of the present invention to prevent impact of the mill centering device.
[0035] Preferably, the rolling mill host computer model sends steel plate information to the main PLC of the rolling line through a network communication switch.
[0036] This invention provides a method and line for controlling the rolling of thick plates to prevent impacts with the mill's centering device. It achieves improved rolling rhythm while protecting the safety of the mill's centering device, ensuring stable and smooth production of the rolling line. It avoids the defects of existing technologies, preventing accidents caused by steel plates colliding with the mill's centering device when the width of the current plate is smaller than the width of the next plate to be rolled. This prevents prolonged equipment downtime and significantly increases maintenance costs. This invention can be applied to the control of similar thick plate straightening machines and has broad application value. Attached Figure Description
[0037] Figure 1 This is a schematic diagram of the on-site layout of the front / rear alignment device;
[0038] Figure 2 This is a schematic diagram of the centering device in front of the collision machine when switching between wide and narrow specifications of steel plates during rolling.
[0039] Figure 3 This is a schematic flowchart of the wide and thick plate rolling control method of the present invention;
[0040] Figure 4 This is a schematic diagram of the structural architecture of the rolling mill of the present invention. Detailed Implementation
[0041] 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.
[0042] Combination Figure 3 As shown, this invention provides a method for controlling the rolling of wide and thick plates to prevent collisions with the mill's centering device. Based on the mill's action in rolling the current steel plate, the corresponding actions of the pre-mill and post-mill centering devices are controlled. After the mill completes the rolling process of the current steel plate, the opening of the pre-mill centering device is set to the maximum width of the steel plate. Then, information on the next steel plate to be rolled is received. Specifically, the method includes the following steps:
[0043] S1, the rolling mill host computer model sends steel plate information;
[0044] S2, determine whether the main PLC of the rolling mill has received the steel plate information. If yes, proceed to step S3; otherwise, wait for the rolling mill host computer model to send the information.
[0045] S3, determine whether the rolling mill stand PLC has received the steel plate information. If yes, proceed to step S4; otherwise, wait for the rolling mill main PLC to send the information.
[0046] S4, the mill's front centering device is activated;
[0047] S5, determine whether the front alignment device has been activated. If yes, proceed to step S6; otherwise, wait for the front alignment device to activate.
[0048] S6, the rolling mill stand PLC sends a steel feeding completion signal to the rolling mill main PLC;
[0049] S7, the main PLC of the rolling mill checks whether the conditions for the next steel plate feed are met. If they are met, proceed to step S8; if not, wait for the conditions for the next steel plate feed to be met.
[0050] S8, the rolling mill begins rolling steel plates;
[0051] S9. Determine whether the steel-biting rolling force of the rolling mill is greater than 750 tons, and whether the tail position of the steel plate is greater than 153.83m from the center position of the rolling mill. If yes, proceed to step S10; otherwise, wait for the rolling mill to roll the steel plate.
[0052] S10, the rolling mill begins to discard steel;
[0053] S11, the rolling pass of the rolling mill is automatically reversed once;
[0054] S12, the mill rear centering device is positioned to the position of the mill front centering device;
[0055] S13, the main PLC of the rolling mill checks whether the conditions for the reverse pass of the steel plate are met. If they are met, proceed to step S14; if not, wait for the conditions for the reverse pass of the steel plate to be met.
[0056] S14, the L1 system of the rolling mill executes the pass and roll gap control cycle set by the upper computer model of the rolling mill;
[0057] S15, the main PLC of the rolling line determines whether it is the last pass. If yes, proceed to step S16; otherwise, wait for the L1 system of the rolling mill to execute the pass and roll gap control rolling cycle set by the upper computer model of the rolling mill.
[0058] S16, the rolling mill begins to discard steel;
[0059] S17, determine whether the tail position of the rolled steel plate has left the center line of the rolling mill. If yes, proceed to step S18; otherwise, wait for the tail position of the rolled steel plate to leave the center line of the rolling mill by 153.83m.
[0060] S18, the opening of the machine front centering device is set to 5m at the position of the maximum specification steel plate width;
[0061] S19, the main PLC of the rolling line receives information about the next rolled steel plate.
[0062] Combination Figure 4 As shown, the present invention also provides a rolling mill line, including a rolling mill host computer model 10, a rolling mill line main PLC 20, and a rolling mill stand PLC 30.
[0063] The rolling mill host computer model 10 sends steel plate information to the main PLC 20 of the rolling line through the network communication switch 40.
[0064] The rolling mill stand PLC20 receives steel plate information transmitted by the rolling line main PLC10.
[0065] The present invention provides a rolling mill control method for preventing impact on the centering device of the rolling mill in the rolling of wide and thick plates.
[0066] 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 method for controlling the rolling of wide and thick plates to prevent impact from the centering device of a rolling mill, characterized in that: Based on the current rolling action of the rolling mill, control the corresponding actions of the front and rear centering devices of the mill. After the rolling mill completes the current rolling process of the steel plate, the opening of the mill centering device is set to the maximum specification steel plate width. Then receive information about the next piece of steel plate to be rolled.
2. The method for controlling the rolling of wide and thick plates to prevent impact from the mill centering device according to claim 1, characterized in that, The method for controlling the rolling of wide and thick plates specifically includes the following steps: S1, the rolling mill host computer model sends steel plate information; S2, determine whether the main PLC of the rolling mill has received the steel plate information. If yes, proceed to step S3; otherwise, wait for the rolling mill host computer model to send the information. S3, determine whether the rolling mill stand PLC has received the steel plate information. If yes, proceed to step S4; otherwise, wait for the rolling mill main PLC to send the information. S4, the mill's front centering device is activated; S5, determine whether the front alignment device has been activated. If yes, proceed to step S6; otherwise, wait for the front alignment device to activate. S6, the rolling mill stand PLC sends a steel feeding completion signal to the rolling mill main PLC; S7, the main PLC of the rolling mill checks whether the conditions for the next steel plate feed are met. If they are met, proceed to step S8; if they are not met, wait for the conditions for the next steel plate feed to be met. S8, the rolling mill begins rolling steel plates; S9, determine whether the steel biting rolling force of the rolling mill is greater than the set value, and whether the tail position of the steel plate at the steel ejection window is greater than the set value of the center position of the rolling mill. If yes, proceed to step S10; otherwise, wait for the rolling mill to roll the steel plate. S10, the rolling mill begins to discard steel; S11, the rolling pass of the rolling mill is automatically reversed once; S12, the rear centering device of the rolling mill is positioned at the position of the front centering device; S13, the main PLC of the rolling mill checks whether the conditions for the reverse pass of the steel plate are met. If they are met, proceed to step S14; if they are not met, wait for the conditions for the reverse pass of the steel plate to be met. S14, the L1 system of the rolling mill executes the pass and roll gap control cycle set by the upper computer model of the rolling mill; S15, the main PLC of the rolling line determines whether it is the last pass. If yes, proceed to step S16; otherwise, wait for the L1 system of the rolling mill to execute the pass and roll gap control rolling cycle set by the upper computer model of the rolling mill. S16, the rolling mill begins to discard steel; S17, determine whether the tail position of the rolled steel plate has left the center line of the rolling mill. If yes, proceed to step S18; otherwise, wait for the tail position of the rolled steel plate to leave the center line of the rolling mill. S18, the opening degree of the front centering device is set to the position of the maximum specification steel plate width; S19, the main PLC of the rolling line receives information about the next rolled steel plate.
3. A rolling mill, characterized in that: This includes the rolling mill host computer model, the rolling line main PLC, and the rolling mill stand PLC; The rolling mill host computer model sends steel plate information to the main PLC of the rolling line; The rolling mill stand PLC receives the steel plate information transmitted by the rolling line main PLC; The rolling line implements the method for controlling the rolling of thick plates as described in any one of claims 1-2, which prevents the mill centering device from colliding.
4. The rolling mill according to claim 2, characterized in that: The rolling mill host computer model sends steel plate information to the main PLC of the rolling line through a network communication switch.