A method and system for controlling the replacement of work rolls in a 1580 hot strip finishing mill
By simultaneously performing the actions of internal and external equipment in the 1580 hot strip finishing mill and optimizing the roll loading and unloading process, the problem of long work roll replacement time was solved, and the roll changing efficiency and hot rolling production efficiency were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 武汉钢铁有限公司
- Filing Date
- 2023-06-25
- Publication Date
- 2026-06-02
Smart Images
Figure CN116833233B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of finishing mill roll changing control technology, specifically relating to a method and system for changing work rolls in a 1580 hot continuous rolling mill finishing mill. Background Technology
[0002] The 1580 hot strip mill finishing mill requires frequent work roll replacements due to wear during the rolling process; normally, the work rolls need to be replaced every 2-3 hours. Currently, the finishing mill's work roll replacement uses a sequential control method. After the finishing mill has rolled the last piece of steel, the control panel activates the "roll change preparation" function. The equipment inside the finishing mill begins to move and position itself. Once the relevant detection equipment meets the detection conditions, the roll change process automatically starts. The mechanical equipment operates step by step according to the pre-defined roll change plan. Only after the previous piece of equipment has moved and the corresponding sensor has detected the movement does the next piece of equipment begin to move. The entire roll change process is time-consuming, severely impacting the effective operating rate of the hot rolling production line.
[0003] In summary, the high frequency of daily roll changes and the long time required for each roll change at the 1580 hot strip mill have severely impacted the production line's calendar operation rate and output. Therefore, it is urgent to improve and upgrade the existing roll replacement method for the finishing mill. Summary of the Invention
[0004] The purpose of this invention is to provide a method and system for controlling the replacement of work rolls in a 1580 hot strip mill finishing mill, thereby solving the problem of long work roll replacement time in existing 1580 hot strip mill finishing mills.
[0005] The technical solution adopted in this invention is as follows:
[0006] A method for controlling the replacement of work rolls in a 1580 hot strip finishing mill includes:
[0007] When the roll change preparation begins, the following three processes are performed simultaneously: 1. The roll change trolley begins to move from the initial position E3 to the target position E9; 2. The equipment inside the mill sequentially performs roll return to zero, main shaft positioning, and pressure unloading; 3. The equipment outside the mill sequentially lifts the looper and deploys the inlet and outlet guides.
[0008] When the roller is pulled out, the upper support balance cylinder and the working roller track beam lifting cylinder lift at the same time. When the working roller track beam is lifted to the position and the upper support balance cylinder is lifted, the working roller balance cylinder is activated. When the roller is loaded, the upper support balance cylinder, the working roller balance cylinder and the working roller track beam lifting cylinder lower and retract at the same time.
[0009] The roll change end mark is adjusted from the roll change trolley returning to the initial position E3 to the roll change trolley exiting a certain area of the mill.
[0010] Furthermore, the roll changing trolley exiting a certain area of the rolling mill specifically means: the roll changing trolley retracts to position E6.
[0011] Furthermore, once the unloading and inlet / outlet guides are deployed, the roll change preparation is complete, and the roll change begins. The roll change includes roll removal and roll loading. When removing the roll, the roll change trolley reaches the target position E9, removes the work roll, and returns to the initial position E3. When loading the roll, the roll change trolley pushes the new work roll from the initial position E3 into the finishing mill at position E9, and then returns to the initial position E3.
[0012] A work roll changing control system for a 1580 hot strip finishing mill, comprising:
[0013] The roll change preparation module is used to simultaneously perform the following three processes when roll change preparation begins: 1. The roll change trolley begins to move from the initial E3 position to the target position E9 position; 2. The equipment inside the mill sequentially performs roll return to zero, main shaft positioning, and pressure unloading; 3. The equipment outside the mill sequentially lifts the looper and deploys the inlet and outlet guides.
[0014] The roller pulling and loading module is used to simultaneously lift the upper support balance cylinder and the working roller track beam lifting cylinder during roller pulling. The working roller track beam is lifted into position and the working roller balance cylinder is lifted during the lifting process of the upper support balance cylinder. During roller loading, the upper support balance cylinder, the working roller balance cylinder and the working roller track beam lifting cylinder are lowered and retracted simultaneously.
[0015] The roll change end module is used to adjust the roll change end flag from the roll change trolley to the initial position E3 when the roll change trolley has completely returned to a certain area of the rolling mill.
[0016] Furthermore, the roll changing trolley exiting a certain area of the mill in the roll changing end module specifically means: the roll changing trolley retracts to position E6.
[0017] Furthermore, once the unloading and inlet / outlet guides are deployed, the roll change preparation is complete, and the roll change begins. The roll change includes roll removal and roll loading. When removing the roll, the roll change trolley reaches the target position E9, removes the work roll, and returns to the initial position E3. When loading the roll, the roll change trolley pushes the new work roll from the initial position E3 into the finishing mill at position E9, and then returns to the initial position E3.
[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:
[0019] This invention, without altering the existing roll changing machinery and electrical equipment, effectively improves the speed of roll changing machinery operation by redesigning and optimizing some control methods and sequential steps in the existing roll changing process. This increases the efficiency of changing work rolls on the 1580 finishing mill, significantly shortens roll changing time, and effectively improves the operating rate of the hot rolling line. Attached Figure Description
[0020] Figure 1 This is a flowchart of the original finishing mill work roll changing control method;
[0021] Figure 2 This is a flowchart of the finishing mill work roll changing control method of the present invention;
[0022] Figure 3 This is a timing diagram of the roller changing operation of the present invention;
[0023] Figure 4 Flowchart for the original rollers;
[0024] Figure 5 This is a flowchart of the roller loading process of the present invention;
[0025] Figure 6 This is a timing diagram of the roller loading operation of the present invention;
[0026] Figure 7 This is a timing diagram showing the simultaneous operation of the device according to the present invention. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.
[0028] The purpose of this invention is to provide an improved control method for automatic roll changing in finishing mills during hot continuous rolling production. Without changing the existing roll changing machinery and electrical equipment, the invention effectively improves the speed of action connection of the roll changing machinery and significantly improves the efficiency of automatic roll changing in finishing mills by redesigning and optimizing some control methods and sequential steps in the existing roll changing process.
[0029] The automatic roll changing control method for a finishing mill involved in this invention consists of three control systems: one for roll changing preparation, one for automatic roll removal, and one for automatic roll loading. The roll changing preparation stage includes: returning the roll to zero, positioning and stopping the main shaft, pressing down and unloading, lifting the looper, and automatically deploying the inlet and outlet guides. Automatic roll removal includes: the roll changing trolley moving to position E9 in front of the mill, the upper and lower roll systems moving to prepare for roll removal, and the roll changing trolley removing the work roll to position E3 on the traverse platform. Automatic roll loading includes: the roll changing trolley pushing the new roll from position E3 into the mill (position E9), the upper and lower roll systems moving to load the rolls, the upper and lower roll systems moving to the working position after the work roll is loaded, the roll changing trolley retracting to outside the traverse platform (position E3), and the mill automatically switching modes. The entire roll changing process is controlled by clicking the roll changing preparation and confirmation buttons.
[0030] The entire roll changing process involves the mechanical equipment performing actions step by step in sequence. In particular, the roll changing trolley moves slowly (it takes 60 seconds to move from position E3 to position E9), resulting in a long roll changing time and affecting overall production efficiency.
[0031] To shorten the roll changing time, this invention divides the roll changing equipment of the finishing mill into internal and external equipment. During the entire roll changing process, the internal and external equipment operate synchronously while satisfying the interlocking relationship of the mechanical equipment. By adjusting the original serial steps to parallel steps, the roll changing efficiency is effectively improved.
[0032] The main equipment inside the rolling mill includes: roll shifting device, roll reduction device, upper support roll balancing device, upper step pad device, work roll balancing device, upper and lower work roll clamping plates, upper and lower work roll main shafts, work roll track beam device, lower support roll lifting device, lower step pad device, etc.
[0033] The external equipment of the rolling mill includes the finishing mill roll changing trolley, looper, inlet and outlet guides, etc.
[0034] In the original roll changing control method, the equipment outside the mill only started moving to the target position after the equipment inside the finishing mill was in place; after the automatic roll pulling was started, the roll changing trolley started moving from the initial position E3 to the front E9 position of the mill. When the roll loading was completed, the roll changing trolley returned to the initial roll changing position E3 without load, and the finishing mill mode was automatically switched after the roll loading was completed.
[0035] Redesigned and improved control method:
[0036] 1) Move the roll changing trolley from the initial E3 position to the target position E9 position instead of from "after roll changing preparation is completed" to "when roll changing preparation begins". When the operator presses the button on the screen to start "roll changing preparation", the roll changing trolley will start moving from the initial E3 position to the target position E9 position. This will enable the rolling mill equipment to move in sync with the roll changing trolley, reducing the time spent waiting for the roll changing trolley to reach the target position E9 after the rolling mill equipment has reached its position.
[0037] 2) During roll change preparation, the sequential control of the internal and external equipment is changed from serial control to parallel control, shortening the overall operation time: during the internal equipment's roll return to zero, main shaft positioning, and unloading, the external equipment's looper and inlet / outlet guides operate synchronously, effectively reducing roll change preparation time. Figure 1 , Figure 2 and Figure 3 As shown.
[0038] 3) During the automatic roller feeding and loading process, while ensuring the interlocking of mechanical equipment, some equipment is adjusted from sequential steps to synchronous actions, such as... Figure 7 As shown.
[0039] Before adjustment: When pulling the roll, the work roll track beam is raised to its position first, then the upper support balance cylinder is raised, and after the upper support balance cylinder is raised to its position, the work roll extends out in balance. When loading the roll, the work roll track beam descends first, then the upper support balance cylinder descends, and finally the work roll balance cylinder retracts. During the pulling of the roll, the track beam and the work roll balance are affected by mechanical interaction, while the track beam and the upper support balance cylinder can be raised simultaneously. However, during the loading of the roll, all three can descend and retract simultaneously without mutual interference.
[0040] After adjustment: When pulling the roll, the upper support balance cylinder and the working roll track beam lifting cylinder lift simultaneously. The working roll balance cylinder operates when the working roll track beam is lifted into position and during the lifting process of the upper support balance cylinder. When loading the roll, the upper support balance cylinder, the working roll balance cylinder, and the working roll track beam lifting cylinder lower and retract simultaneously.
[0041] 4) The roll change completion indicator has been adjusted from being determined by the roll change trolley fully returning to its initial position (E3) to being determined by the roll change trolley exiting a certain area of the mill (E6). This allows for earlier reloading of equipment within the mill. Figure 4 , Figure 5 and Figure 6 As shown.
[0042] The implementation and application of this technology has improved the efficiency of changing work rolls on the 1580 finishing mill, significantly shortened the roll changing time, and increased the operating rate of the hot rolling line.
[0043] The present invention also provides a work roll replacement control system for a 1580 hot strip mill finishing mill, comprising:
[0044] The roll change preparation module is used to simultaneously perform the following three processes when roll change preparation begins: 1. The roll change trolley begins to move from the initial E3 position to the target position E9 position; 2. The equipment inside the mill sequentially performs roll return to zero, main shaft positioning, and pressure unloading; 3. The equipment outside the mill sequentially lifts the looper and deploys the inlet and outlet guides.
[0045] The roller pulling and loading module is used to simultaneously lift the upper support balance cylinder and the working roller track beam lifting cylinder during roller pulling. The working roller track beam is lifted into position and the working roller balance cylinder is lifted during the lifting process of the upper support balance cylinder. During roller loading, the upper support balance cylinder, the working roller balance cylinder and the working roller track beam lifting cylinder are lowered and retracted simultaneously.
[0046] The roll change end module is used to adjust the roll change end flag from the roll change trolley to the initial position E3 when the roll change trolley has completely returned to a certain area of the rolling mill.
[0047] Furthermore, the roll changing trolley exiting a certain area of the mill in the roll changing end module specifically means: the roll changing trolley retracts to position E6.
[0048] Furthermore, once the unloading and inlet / outlet guides are deployed, the roll change preparation is complete, and the roll change begins. The roll change includes roll removal and roll loading. When removing the roll, the roll change trolley reaches the target position E9, removes the work roll, and returns to the initial position E3. When loading the roll, the roll change trolley pushes the new work roll from the initial position E3 into the finishing mill at position E9, and then returns to the initial position E3.
[0049] like Figure 1 , Figure 2 and Figure 3 As shown, during roll change preparation, the internal and external equipment of the mill are divided into three parallel states: the looper and guide plate, the roll shifting spindle and pressing, and the roll change trolley move simultaneously. After starting "roll change preparation", the roll change trolley begins to move from the initial position E3 to the target position E9.
[0050] like Figure 4 , Figure 5 and Figure 6 As shown, the indicator for the end of the finishing mill roll change has been adjusted from the roll change trolley retracting from position E3 to position E6, indicating the roll change is complete (the trolley continues to retract to position E3). The roll change trolley stops after retracting to position E3.
[0051] like Figure 7 As shown in the iba diagram, the equipment inside the rolling mill moves in advance while ensuring the equipment is interlocked: the upper support balance cylinder and the lower work roll track beam rise simultaneously, the upper support balance cylinder and the work roll balance cylinder rise simultaneously, etc.
[0052] This invention can effectively improve the roll changing efficiency of finishing mills, reduce roll changing time, and help improve production line operating rate.
[0053] It should be noted that, depending on the implementation needs, the various steps / components described in this application can be broken down into more steps / components, or two or more steps / components or parts of the operation of steps / components can be combined into new steps / components to achieve the purpose of this invention.
[0054] Those skilled in the art will readily understand that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A method for controlling the replacement of work rolls in a 1580 hot strip mill finishing mill, characterized in that, include: When the roll change preparation begins, the following three processes are performed simultaneously: First, the roll change trolley begins to move from the initial position E3 to the target position E9; 2. The equipment inside the mill sequentially moves the rolls back to zero, positions the main shaft, and presses down to unload; 3. The equipment outside the mill sequentially lifts the looper and deploys the inlet and outlet guides; once the pressing down to unload and the deployment of the inlet and outlet guides are completed, the roll change preparation is complete, and then the roll change begins, which includes roll pulling and roll loading. During roll removal, the upper support balance cylinder and the work roll track beam lifting cylinder lift simultaneously. The work roll balance cylinder operates during the lifting of the work roll track beam and the lifting process of the upper support balance cylinder. During roll loading, the upper support balance cylinder, the work roll balance cylinder, and the work roll track beam lifting cylinder lower and retract simultaneously. Specifically, during roll removal, the roll changing trolley reaches the target position E9, removes the work roll, and returns to the initial position E3. During roll loading, the roll changing trolley pushes the new work roll from the initial position E3 into the finishing mill at position E9, and then returns to the initial position E3. The roll change end mark is adjusted from the roll change trolley returning to the initial position E3 to the roll change trolley exiting a certain area of the mill, i.e., retreating to position E6.
2. A work roll changing control system for a 1580 hot strip mill finishing mill, characterized in that, include: The roll change preparation module is used to simultaneously perform the following three processes when roll change preparation begins:
1. The roll change trolley begins to move from the initial position E3 to the target position E9; 2. The equipment inside the mill sequentially performs roll return to zero, main shaft positioning, and pressure unloading; 3. The equipment outside the mill sequentially lifts the looper and deploys the inlet and outlet guides; Once pressure unloading and deployment of the inlet and outlet guides are completed, roll change preparation is complete, and roll change begins, which includes roll pulling and roll loading. The roll pulling and loading module is used to simultaneously lift the upper support balance cylinder and the work roll track beam lifting cylinder during roll pulling. The work roll balance cylinder is activated when the work roll track beam is lifted into position and during the lifting process of the upper support balance cylinder. During roll loading, the upper support balance cylinder, the work roll balance cylinder, and the work roll track beam lifting cylinder are simultaneously lowered and retracted. Specifically, during roll pulling, the roll changing trolley reaches the target position E9, pulls out the work roll, and returns to the initial position E3. During roll loading, the roll changing trolley pushes the new work roll from the initial position E3 into the finishing mill at position E9, and then returns to the initial position E3. The roll change end module is used to adjust the roll change end flag from the initial position E3 when the roll change trolley has completely returned to the initial position to the position E6 when the roll change trolley exits a certain area of the rolling mill.