A control method for a logic area in front of a plate finishing mill

Abstract

The application discloses a control method of a middle-thickness plate extended logical area in front of a finishing mill, and comprises the following steps: selecting a double-stand rolling line with a rough rolling mill and a finishing mill, dividing the logical area of the rough rolling mill and the finishing mill, and extracting a rough rolling mill post-rolling area, a rough rolling mill outlet area, a finishing mill inlet area and a finishing mill pre-rolling area; the rough rolling mill post-rolling area, the rough rolling mill outlet area, the finishing mill inlet area and the finishing mill pre-rolling area are divided into twelve roller way group areas; a reserved roller way area is set; one roller way group area is divided into the finishing mill inlet area, the logic and the condition of the related area state switching are changed; a separation point of the finishing mill inlet area is set, and a program control system is configured to automatically select a tracking mode of the separation point according to the length of a steel plate. The method increases the length of the waiting space in front of the finishing mill, simultaneously automatically judges and dynamically changes the position of the group blank separation point, expands the adaptation to different product specifications, and improves the production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgical industry equipment, and particularly relates to a control method of a logic area in front of a finishing mill for a medium plate. BACKGROUND

[0002] There are many domestic and foreign thick plate production lines, and most of the rolling mills are composed of rough rolling mills and finishing mills. There are three main production modes for medium plate production: automatic production, semi-automatic production and manual production. Among them, the automatic production refers to that the program automatically controls the regulation setting and rolling line rhythm control; the semi-automatic production usually refers to that the vertical direction (rolling mill roll gap, rolling force setting, etc.) is automatically controlled, and the horizontal direction (such as the action of the roller and the push bed) is manually operated; the manual production refers to that the vertical direction and the horizontal direction are manually operated. The line coordinator (LCO: Line COordinator) is an indispensable core function in the automatic medium plate production line control system, and undertakes the responsibility of "on-site general commander". The line coordinator issues instructions to the roller and other equipment according to the real-time distribution of the steel plate provided by the material tracking system (MTR: Material TRacking), to ensure that the production is safe, orderly and efficient. The line coordinator module (rolling coordination) triggers the continuous advancement of the production process based on the real-time tracking results, combined with process requirements, equipment state, rolling line setting, manual intervention and other information, to realize the automatic production of the rolling line. Compared with the traditional manual control production rhythm mode, the line coordinator has many advantages. On the one hand, a well-designed line coordinator can greatly improve the safety of production and reduce manual errors; on the other hand, the line coordinator improves the temperature accuracy of each process node through standardized scheduling, which is of great significance to ensure product quality. However, the line coordinator also has some disadvantages. In the automatic mode, due to the imperfect function of the line coordinator, it is inevitable to limit the production rhythm, which has a certain impact on the production potential. In the control system of the line coordinator, the logic control area is divided into eight areas according to the production logistics direction, which are: rough rolling inlet area, rough rolling area, rough rolling outlet area, finishing rolling inlet area, finishing rolling area, finishing rolling outlet area, MULPIC cooling area and hot straightening area. According to the physical space and combined with the process requirements, the logical area and the physical range are defined in the program. During production, the steel plate will pass through the rough rolling mill according to the logic control, and the rolled steel plate will be transported to the finishing mill front waiting area, then the waiting plate will be transported to the finishing mill inlet area, and then to the finishing rolling area for rolling. After the finishing rolling is completed, the plate is transported to the straightening machine area, and finally to the cooling bed for slow cooling.

[0003] Please refer to Figure 1 , Figure 1The figure indicates the rolling state control diagram of the existing rolling line coordinator for the front area of the finishing mill. Figure 1 As shown in the figure, the steel plates to be warmed in the entry waiting area of the finishing mill are the to-be-warmed plate B and the to-be-warmed plate C. When the finishing mill is rolling the steel plate A in the last pass, the steel plate A moves in the material flow direction. When the position of the tail of the steel plate A is greater than the separation point 2, the to-be-warmed plate B and the to-be-warmed plate C start to be transported to the finishing mill. Until the tail of the to-be-warmed plate B is greater than the separation point 1, the to-be-warmed plate C starts to be transported back to the entry waiting area of the finishing mill in the reverse direction, and the to-be-warmed plate B continues to be transported in the material flow direction. The original batch grouping function allows multiple rough rolling intermediate blanks to be uniformly arranged in the intermediate waiting area, which can reduce the waiting time for the start of rolling of the finishing mill and improve the production efficiency. However, in actual production, it is found that due to the limitation of the rough rolling steel entry permission condition, the number of intermediate blanks included in the batch grouping cannot be further increased, and when rolling some thick specifications, the waiting time for the start of rolling of the finishing mill is relatively long. The original rolling line coordination function cannot meet the production requirements of some newly expanded special specifications, and also limits the further improvement of the efficiency, so it is necessary to expand and improve the function.

[0004] According to the above-mentioned production problems, combined with Figure 1 L1 is the space length of the rolling area after the rough rolling mill, L2 is the space length of the rough rolling outlet area, L3 is the space length of the entry area of the finishing mill, and L4 is the space length of the rolling area in front of the finishing mill. The final rolling length of the rolling steel plate A is limited by the length of the entry area of the finishing mill, and if the rolling steel plate A is relatively long, it will also affect the number of to-be-warmed plates in front of the finishing mill, and even no steel plate can be warmed. At the same time, with the improvement of the thick plate production capacity and the expansion of the product specifications, the length of the steel plate rolled by the rough rolling mill becomes longer. When the length is greater than the distance from the separation point 2 to the center line of the finishing mill, the steel plate separated at the original separation point has the risk of colliding with the rolling mill. SUMMARY

[0005] The purpose of the present application is to provide a control method for expanding the logic area in front of the finishing mill of a medium plate, to increase the waiting space length in front of the finishing mill, and to automatically judge and dynamically change the position of the batch grouping separation point to expand the adaptation to different product specifications and improve the production efficiency.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0007] A control method for expanding the logic area in front of the finishing mill of a medium plate, comprising the following steps:

[0008] Step one: select a double rack rolling line with rough rolling mill and finishing rolling mill, divide the logical area of the rough rolling mill and the finishing rolling mill, extract the rough rolling mill post rolling area, rough rolling mill outlet area, finishing rolling mill inlet area and finishing rolling mill pre rolling area, the space length of the rough rolling mill post rolling area is set as L1, the space length of the rough rolling mill outlet area is set as L2, the space length of the finishing rolling mill inlet area is set as L3, and the space length of the finishing rolling mill pre rolling area is set as L4;

[0009] Step two: the rough rolling mill post rolling area, the rough rolling mill outlet area, the finishing rolling mill inlet area and the finishing rolling mill pre rolling area are divided into twelve roller way group areas, which are RX1, RX2, RX3, RX4, RX5, FE7, FE6, FE5, FE4, FE3, FE2 and FE1, the rough rolling mill post rolling area corresponds to the RX1 roller way group area, the rough rolling mill outlet area corresponds to the RX2 roller way group area, the RX3 roller way group area, the RX4 roller way group area and the RX5 roller way group area, the finishing rolling mill inlet area corresponds to the FE7 roller way group area, the FE6 roller way group area, the FE5 roller way group area, the FE4 roller way group area and the FE3 roller way group area, and the finishing rolling mill pre rolling area corresponds to the FE1 roller way group area, wherein the junction of the finishing rolling mill inlet area and the finishing rolling mill pre rolling area is located in the range of the FE2 roller way group area;

[0010] Step three: the maximum value of the steel plate final rolling length of the rough rolling mill is set as Lmax, the steel plate throwing distance is set as L0, the starting point of the RX1 roller way group area is taken as the initial position, and a roller way area extending Y meters backward is reserved, wherein Y=Lmax+L0;

[0011] Step four: the RX5 roller way group area is divided into the finishing rolling mill inlet area, the related area state switching logic and condition are changed, and the area state switching logic and condition are as follows:

[0012] The logic condition of the program control system for confirming the logical area switching of the rough rolling mill and the finishing rolling mill is changed to: the critical position of the RX4 roller way group area and the RX5 roller way group area minus four meters;

[0013] The state switching logic setting of the RX2 roller way group area is changed to: determining that the tail of the steel plate is in the range of the RX2 roller way group area, and executing the mutual jump of the forward steel plate swinging and the reverse steel plate swinging;

[0014] The state switching logic setting of the RX4 roller way group area is changed to: determining that the tail of the steel plate is ready to leave the range of the RX4 roller way group area, and executing the mutual jump of the rough rolling mill outlet forward steel plate swinging and the rough rolling mill outlet reverse steel plate swinging;

[0015] The state switching logic setting change of the RX5 roller set group area is: determining that the tail of the steel plate is ready to leave the range of the RX5 roller set group area, the rough rolling outlet positive swing steel jumps to the entering rough finishing rolling bay group batch, the conveying speed of the RX5 roller set group area is changed from 0 to the conveying speed of the RX4 roller set group area;

[0016] Step five: the junction of the FE4 roller set group area and the FE3 roller set group area is set as the separation point of the rough rolling entrance area, the program control system is configured to automatically select the tracking mode of the separation point according to the length of the steel plate, when Lmax is greater than the distance between the separation point and the center line of the rough rolling mill, the separation point is forced to be corrected to the junction of the FE6 roller set group area and the FE5 roller set group area, and when Lmax is less than the distance between the separation point and the center line of the rough rolling mill, the separation point remains unchanged.

[0017] Preferably, in the step four, the tail position of the steel plate is determined by the hot metal detector HMD arranged in each roller set group area.

[0018] Preferably, in the step five, the tracking mode is that when the program control system receives the change of the hot detection signal in the FE6 roller set group area, it indicates that the steel plate has reached the junction of the FE6 roller set group area and the FE5 roller set group area, the image of the steel plate can be captured, so as to automatically select the separation point according to the length of the steel plate.

[0019] The beneficial effects of the present application: after the implementation of the method, on the one hand, under the premise of meeting the effective space of the rough rolling outlet area, the logical length of the rough rolling entrance area is expanded, the length of the waiting area is effectively increased, the number of waiting steel plates can be increased, and the foundation for improving the rolling rhythm and production efficiency is laid; on the other hand, the problem that the rough rolling final rolling length becomes long after the product variety is expanded, resulting in that the group blank cannot be safely separated after the group blank is formed. Since the logical space of the whole rolling area is reasonably optimized, the conditions for product expansion are created, and the rolling efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the logical area distribution of the rough rolling mill and the rough rolling mill.

[0021] Figure 2 is a schematic diagram of the roller grouping arrangement of the rough rolling mill and the rough rolling mill.

[0022] Figure 3 is a schematic diagram of the hot metal detector HMD arrangement of the rough rolling mill and the rough rolling mill.

[0023] Figure 4 is a function description table of the rolling line coordinator related rolling step. EMBODIMENT

[0024] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0025] A control method of a logic area in front of a finishing mill of a medium plate, comprising the following steps:

[0026] Step one: selecting a double-stand rolling line with a roughing mill and a finishing mill, dividing the logic area of the roughing mill and the finishing mill, extracting a roughing mill post-rolling area, a roughing mill outlet area, a finishing mill inlet area, and a finishing mill pre-rolling area, the space length of the roughing mill post-rolling area is set as L1, the space length of the roughing mill outlet area is set as L2, the space length of the finishing mill inlet area is set as L3, and the space length of the finishing mill pre-rolling area is set as L4;

[0027] Step two: the roughing mill post-rolling area, the roughing mill outlet area, the finishing mill inlet area, and the finishing mill pre-rolling area are divided into twelve roller group areas, which are RX1, RX2, RX3, RX4, RX5, FE7, FE6, FE5, FE4, FE3, FE2, and FE1, the roughing mill post-rolling area corresponds to the RX1 roller group area, the roughing mill outlet area corresponds to the RX2 roller group area, the RX3 roller group area, the RX4 roller group area, and the RX5 roller group area, the finishing mill inlet area corresponds to the FE7 roller group area, the FE6 roller group area, the FE5 roller group area, the FE4 roller group area, and the FE3 roller group area, and the finishing mill pre-rolling area corresponds to the FE1 roller group area, wherein the junction of the finishing mill inlet area and the finishing mill pre-rolling area is located in the range of the FE2 roller group area;

[0028] Step three: the maximum value of the steel plate final rolling length of the roughing mill is set as Lmax, and the steel plate throwing distance is set as L0, both in meters, taking the starting point of the RX1 roller group area as the initial position, and reserving a roller area extending Y meters backward, wherein Y=Lmax+L0;

[0029] Step four: dividing the RX5 roller group area to the finishing mill inlet area, changing the logic and conditions of the related area state switching, and the logic and conditions of the area state switching are as follows:

[0030] The logic condition of the program control system for the logic area switching of the roughing mill and the finishing mill is changed to: the critical position of the RX4 roller group area and the RX5 roller group area minus four meters;

[0031] The state switching logic setting of the RX2 roller group area is changed to: determining that the tail of the steel plate is in the range of the RX2 roller group area, and executing the mutual jump of the forward swinging and the reverse swinging;

[0032] The state switching logic setting of the RX4 roller set area is changed: the tail of the steel plate is determined to be ready to leave the range of the RX4 roller set area, and the rough rolling exit forward and reverse swing steel is executed to jump each other;

[0033] The state switching logic setting of the RX5 roller set area is changed: the tail of the steel plate is determined to be ready to leave the range of the RX5 roller set area, the rough rolling exit forward swing steel jumps into the rough and finish rolling inter-group batch, and the conveying speed of the RX5 roller set area is changed to 0 synchronization to the conveying speed of the RX4 roller set area;

[0034] Step five: the junction of the FE4 roller set area and the FE3 roller set area is set as the separation point of the finish rolling entry area, and the program control system is configured to automatically select the tracking mode of the separation point according to the length of the steel plate; when Lmax is greater than the distance between the separation point and the center line of the finish rolling mill, the separation point is forced to be corrected to the junction of the FE6 roller set area and the FE5 roller set area; and when Lmax is less than the distance between the separation point and the center line of the finish rolling mill, the separation point remains unchanged.

[0035] Preferably, in the step four, the tail position of the steel plate is determined by the hot metal detector HMD arranged in each roller set area.

[0036] Preferably, in the step five, the tracking mode is that when the program control system receives the change of the hot detection signal in the FE6 roller set area, it indicates that the steel plate has reached the junction of the FE6 roller set area and the FE5 roller set area, and the image of the steel plate can be captured, so as to automatically select the separation point according to the length of the steel plate.

[0037] As shown in Figure 1 , L1 is the space length of the rough rolling mill post-rolling area, L2 is the space length of the rough rolling exit area, L3 is the space length of the finish rolling entry area, and L4 is the space length of the rough rolling mill pre-rolling area, wherein the lengths of L1 and L4 are limited by the rolling area and cannot be changed, so only the lengths of L2 and L3 can be optimized and redistributed, and under the premise that the total physical space is unchanged, the relative lengths of L2 and L3 are changed according to the process requirements and actual production needs; when the long slab separates, the slab separation point moves a certain distance in the direction of the rough rolling area, and the modification and adjustment are made on the wire binding coordination control and slab tracking, so as to ensure that there is enough space in front of the finish rolling mill when the long slab separates.

[0038] In this embodiment, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4In actual production, considering that the maximum value of the final rolling length of the steel plate of the rough rolling mill is Lmax, plus the throwing distance L0, only Y meters of the roller way after the rough rolling mill needs to be reserved, and the head position of the steel plate after the rolling of the steel plate is completed is still within the range of Lrx, the production demand is met, Figure 1 L2 (the spatial length of the rough rolling exit area) in the formula is equal to Figure 2 Lrx+Ln, wherein Lrx is the total length of the RX2 roller group area, the RX3 roller group area, and the RX4 roller group area, and Ln is the spatial length of the RX5 roller group area. From the process and actual production, the length of Ln can be divided into the space of the finishing rolling entrance area. In order to divide the RX5 roller group area into the finishing rolling entrance area, it is necessary to change the related area state switching logic and conditions synchronously, to move the group blank steel plate setting area of the rolling step 4400 and the rolling step 4450 forward, and to expand the original group blank steel plate setting area by one roller group area in the direction of the rough rolling exit area. The mutual jump of the rolling step 4400 and the rolling step 4450 is changed from the original jump when the hot metal detector HMD of the steel plate tail position is greater than or less than the RX5 roller group area to the jump when the hot metal detector HMD is greater than or less than the RX4 roller group area. The rolling step 4400 jumps to the rolling step 4920, that is, the condition of the finishing rolling entrance area receiving the plate blank of the rough rolling exit area. The conveying speed of the RX5 roller group area is changed to 0 synchronously, and the conveying speed of the RX4 roller group area is changed to 0. The logic condition of the logic area switching confirmation of the program control system for the rough rolling mill and the finishing rolling mill is changed from the original condition that the head position of the plate blank of the rough rolling exit area is greater than the critical position of the rough rolling exit area and the finishing rolling entrance area minus four meters to the condition that the critical position of the RX4 roller group area and the RX5 roller group area minus four meters. The mutual jump condition of the rolling step 8150 and the rolling step 8200 of the rough rolling exit area is changed from the original condition that the tail of the steel plate is detected by the hot metal detector of the RX3 roller group area as the judgment standard to the condition that the tail of the steel plate is detected by the hot metal detector of the RX2 roller group area as the judgment standard, so as to ensure that the plate blank has enough space for setting the steel plate. Based on the above-mentioned changes in the area state switching logic and conditions, when the plate blank reaches the corresponding area, the corresponding control needs to be accepted to set the steel plate.

[0039] The maximum value of the plate finishing length of the rough rolling mill is Lmax, when the distance between the separation point (the junction of the FE4 roller set area and the FE3 roller set area) and the center line of the finishing mill is greater than Lmax, the separation point is forced to be corrected to the junction of the FE6 roller set area and the FE3 roller set area, when the distance between the separation point (the junction of the FE4 roller set area and the FE3 roller set area) and the center line of the finishing mill is less than Lmax, the separation point (the junction of the FE4 roller set area and the FE3 roller set area) remains unchanged, the control mode of automatically selecting the separation point not only can effectively avoid the risk of the slab colliding with the roller when the separation is completed at the junction of the FE4 roller set area and the FE3 roller set area, but also can expand the adaptation to different product specifications and improve the rolling efficiency, based on the control mode of automatically selecting the separation point, the FE6 roller set area is changed from the original slab conveying roller to the separation slab using roller, and the forced correction mode is added in the tracking mode of the FE6 roller set area, in this mode, when the heat detection signal received by the program control system in the FE6 roller set area changes, it indicates that the plate has reached the junction of the FE6 roller set area and the FE5 roller set area, the image of the plate can be captured, so as to automatically select the separation point according to the length of the plate, and fully meet the tracking accuracy requirement.

[0040] After improving the logical area control of the rough rolling mill and the finishing mill by the method, the length of the rough rolling outlet area changes from L1 to Lrx, the length of the finishing rolling inlet area changes from L3 to L3+Ln, the slab separation point not only has the junction of the FE4 roller set area and the FE3 roller set area, but also has a new junction of the FE6 roller set area and the FE5 roller set area, and can automatically judge and select the separation point. On the one hand, under the premise of meeting the effective space of the rough rolling outlet area, the logical length of the finishing rolling inlet area is expanded, the length of the waiting area is effectively increased, the number of waiting slabs can be increased, which lays a foundation for improving the rolling rhythm and production efficiency; on the other hand, the problem that the slab cannot be safely separated after grouping due to the increase of the rough rolling finishing length after the expansion of the raw product is solved. Since the logical space of the whole rolling area is reasonably optimized, conditions are created for product expansion and rolling efficiency is improved.

Claims

1. A control method for the front logic area of ​​a plate expansion finishing mill, characterized by: The following steps are involved: Step 1: Select a double-stand rolling line with a roughing mill and a finishing mill, divide the logical areas of the roughing mill and the finishing mill, extract the rolling area after the roughing mill, the roughing mill outlet area, the finishing mill entrance area, and the finishing mill front rolling area, the spatial length of the roughing mill rear rolling area is set to L1, the spatial length of the roughing mill outlet area is set to L2, the spatial length of the finishing mill entrance area is set to L3, and the spatial length of the finishing mill front rolling area is set to L4; Step 2: The roughing mill rear rolling area, roughing mill outlet area, finishing mill entrance area, and finishing mill front rolling area are divided into twelve roller group areas, namely RX1, RX2, RX3, RX4, RX5, FE7, FE6, FE5, FE4, FE3, FE2, and FE1 twelve roller group areas. The roughing mill rear rolling area corresponds to the RX1 roller group area, the roughing mill outlet area corresponds to the RX2 roller group area, RX3 roller group area, RX4 roller group area, and RX5 roller group area, the finishing mill entrance area corresponds to the FE7 roller group area, FE6 roller group area, FE5 roller group area, FE4 roller group area, and FE3 roller group area, and the finishing mill front rolling area corresponds to the FE1 roller group area, wherein the junction of the finishing mill entrance area and the finishing mill front rolling area is located within the range of the FE2 roller group area; Step 3: The maximum final rolling length of the roughing mill is set to Lmax, the steel throwing distance is set to L0, and the starting point of the RX1 roller group area is used as the initial position. A roller area extending back to Y meters is reserved, where Y = Lmax + L0; Step 4: Divide the RX5 roller group area into the finishing rolling entrance area, and change the logic and conditions of the relevant area state switching. The logic and conditions of the area state switching are as follows: The logical condition for confirming the switching of the logical areas of the roughing mill and the finishing mill by the program control system is changed to: the critical position of the RX4 roller group area and the RX5 roller group area minus four meters; The state switching logic setting of the RX2 roller group zone is changed to: determine whether the tail of the steel plate is within the range of the RX2 roller group zone, and then execute the mutual jump between the forward swing steel and the reverse swing steel; The state switching logic setting of the RX4 roller group zone is changed to: determine that the tail of the steel plate is ready to leave the range of the RX4 roller group zone, and execute the mutual jump between the forward swing steel at the roughing rolling exit and the reverse swing steel at the roughing rolling exit; The state switching logic setting of the RX5 roller group zone is changed to: when the tail of the steel plate is ready to leave the range of the RX5 roller group zone, the steel will swing forward at the roughing exit to enter the roughing and finishing mill batching. The conveying speed of the RX5 roller group zone is changed from 0 to the conveying speed of the RX4 roller group zone at the same time. Step 5: The boundary between the FE4 roller group area and the FE3 roller group area is set as the separation point of the finishing rolling entrance area. The program control system is configured to automatically select the tracking mode of the separation point according to the length of the steel plate. When Lmax is greater than the distance between the separation point and the center line of the finishing mill, the separation point is forcibly corrected to the boundary between the FE6 roller group area and the FE5 roller group area. When Lmax is less than the distance between the separation point and the center line of the finishing mill, the separation point remains unchanged.

2. The control method for the front logic area of ​​the expanded finishing mill for medium and heavy plate according to claim 1, characterized in that: In the step 4, the tail position of the steel plate is determined by a hot metal detector HMD arranged in each roller group area.

3. The control method for the front logic area of ​​the plate expansion finishing mill according to claim 2 is characterized in that: In step five, the tracking mode is that when the thermal detection signal received by the program control system in the FE6 roller group area changes, it indicates that the steel plate has reached the junction of the FE6 roller group area and the FE5 roller group area, and the image of the steel plate can be captured, thereby automatically selecting the separation point according to the length of the steel plate.

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