A method and system for controlling the slab on the furnace back roller table

Abstract

The application provides a slab control method and system for a furnace rear roller table of a heating furnace. The method comprises the following steps: after a current slab is discharged, if a next slab tapping instruction is received before the current slab reaches a preset point of the furnace rear roller table within a preset warning time, the tapping action of the next slab is paused, so that the next slab is not pulled out onto the furnace rear roller table; after the arrival signal of the current slab is detected at the preset point, the tapping action of the next slab is performed again, so that the discharge data of the next slab is sent to a subsequent process when the tapping machine is in a lower position. The application can effectively solve the problem that the discharge data of the furnace rear roller table of the heating furnace is covered, avoid the repeated occurrence of slab tracking error stacking accidents in the subsequent process, and ensure stable production.

Description

Technical Field

[0001] This invention relates to the field of steel production applications, and in particular to a method and system for controlling slabs on the roller conveyor after a heating furnace. Background Technology

[0002] The hot-rolled coil production line in the steel rolling mill is equipped with three walking beam regenerative furnaces to heat slabs to the target exit temperature before they are rolled by subsequent mills. During daily production, due to the fast rolling pace, it often happens that two slabs and their exit data are simultaneously present on the rear roller conveyor. This causes the exit data of the first slab to be overwritten by the exit data of the second slab, resulting in data tracking errors when the two slabs enter the rolling line area for rolling, and a lack of secondary preset data for steel accumulation. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention proposes a method and system for controlling slabs on the roller conveyor after the heating furnace, which mainly solves the problem that existing control methods have the hidden danger of steel piling, which often leads to the data of the slab exiting the furnace on the roller conveyor being overwritten, affecting the rolling stability of subsequent processes and the safety of equipment.

[0004] To achieve the above and other objectives, the technical solution adopted by the present invention is as follows.

[0005] This application provides a method for controlling the slab on the roller conveyor after the furnace of a heating furnace, including:

[0006] If a slab does not reach the preset point on the furnace rear roller conveyor within the corresponding preset warning time after it exits the furnace, and a steel tapping command for the next slab is received, the steel tapping action of the next slab will be paused so that the next slab will not be pulled out onto the furnace rear roller conveyor.

[0007] After the arrival signal of the current slab is detected at the preset point, the tapping action of the next slab is executed so that the tapping data of the next slab is sent to the subsequent process when the tapping machine is in the lower position.

[0008] In one embodiment of this application, there are multiple heating furnaces in an existing hot-rolled coil production line. The average time from the exit of the historical slab from each heating furnace to its transfer to the preset point is used as the preset warning time for the corresponding heating furnace.

[0009] In one embodiment of this application, after determining the preset warning time corresponding to each heating furnace, the method further includes: periodically acquiring the time it takes for the slab of each heating furnace to be conveyed to a preset point, so as to update the preset warning time corresponding to each heating furnace.

[0010] In one embodiment of this application, when the current slab exits the furnace and fails to reach the preset point of the furnace roller conveyor within the corresponding preset warning time, an alarm message is generated.

[0011] In one embodiment of this application, when the arrival signal of the current slab is detected at the preset point, the alarm information is cleared.

[0012] In one embodiment of this application, after sending the furnace exit data of the next slab to the subsequent process when the tapping machine is in the lower position, the method further includes:

[0013] The countdown timer for the tapping of the next slab is started, so that the corresponding slab can be controlled to perform the tapping action after the tapping countdown is completed.

[0014] This application also provides a slab control system for the rear roller conveyor of a heating furnace, comprising: a slab tracking module, used to pause the tapping action of the next slab if the current slab does not reach the preset point of the rear roller conveyor within a corresponding preset warning time after exiting the furnace, so that the next slab will not be pulled onto the rear roller conveyor; and a tapping control module, used to execute the tapping action of the next slab after detecting the arrival signal of the current slab at the preset point, so as to send the exit data of the next slab to the subsequent process when the tapping machine is in the lower position.

[0015] As described above, the present invention proposes a method and system for controlling slabs on the roller conveyor after the furnace of a heating furnace, which has the following beneficial effects.

[0016] This application tracks the position of the slab after it exits the furnace. If the slab fails to reach the preset point on the rear roller conveyor after the system's preset warning time, the next slab's steel output action is automatically stopped. This prevents the next slab from overwriting the exit data of the previous slab that has not yet reached the preset point. The steel output action of the next slab and the sending of exit data are only started after the previous slab has passed the preset point. This effectively avoids the situation where the exit data of two slabs on the rear roller conveyor are overwritten, leading to errors in the data tracking of the slabs entering the subsequent processes and the lack of secondary setting for steel stacking, which affects the production line's production stability and the rolling yield. Attached Figure Description

[0017] Figure 1 This is a schematic flowchart of a method for controlling the slab on the roller conveyor after the heating furnace in one embodiment of this application.

[0018] Figure 2 This is a block diagram of the slab control system of the roller conveyor after the heating furnace in one embodiment of this application. Detailed Implementation

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] The inventors discovered that due to a design flaw in the heating furnace process control system, the existing heating furnace's rear roller conveyor can only hold one slab and its exit data. During daily production, due to the fast rolling pace, two slabs and their exit data often appear on the rear roller conveyor, causing the exit data of the previous slab to be overwritten by the exit data of the next slab. This leads to data tracking errors between the two slabs during rolling on the rolling line, and a lack of secondary setting for steel stacking. For example, due to equipment failure or other reasons, if the previous slab remains on the rear roller conveyor after exiting the furnace and is not sent to the roughing mill descaling box, and the next slab exits before the previous slab is transferred to HMD201 (the hot metal detector in front of the roughing mill descaling box in the rolling line direction), the exit data of the next slab will overwrite the exit data of the previous slab, resulting in data tracking errors between the two slabs and a lack of secondary setting for steel stacking. If the operator fails to detect the previous slab that is stuck in time and does not intervene in time, two slabs on the furnace back roller table will be sent to the roughing descaling box and the roughing mill for rolling at the same time, which will seriously affect the rolling stability and the safety of the equipment on site.

[0022] Based on the problems existing in the prior art, this application optimizes the control method of the slab on the roller conveyor after the heating furnace to ensure that two slabs and furnace exit data do not appear on the roller conveyor simultaneously, thereby ensuring the accuracy of furnace exit data tracking. The technical solution of this application will be described in detail below with reference to specific embodiments.

[0023] Please see Figure 1 , Figure 1 This is a flowchart illustrating a method for controlling slabs on the roller conveyor after the furnace in an embodiment of this application. The method for controlling slabs on the roller conveyor after the furnace in this embodiment includes the following steps:

[0024] Step S100: After the current slab exits the furnace, if it does not reach the preset point of the furnace rear roller conveyor within the corresponding preset warning time, and if a steel tapping command for the next slab is received, the steel tapping action of the next slab is paused, so that the next slab will not be pulled out onto the furnace rear roller conveyor.

[0025] In one embodiment, there are multiple heating furnaces on the production line, and the average time from the historical exit of the slab from each heating furnace to its transfer to the preset point is used as the preset warning time for the corresponding heating furnace.

[0026] Specifically, after exiting the furnace, slabs from different heating furnaces are first conveyed to the roughing descaling box via a rear roller conveyor. Slabs inside the furnace can be dragged onto the rear roller conveyor by the tapping machine. When the tapping machine is in the lower position, the exit data of the corresponding slab is sent to the subsequent processes, allowing them to pre-calculate rolling parameters based on this data. A sensor can be installed between the heating furnace and the roughing descaling box to detect the position of the exiting slab; this sensor's detection position is the preset point. The time it takes for each heating furnace slab to travel from the exiting furnace to the preset point can be pre-collected over a certain period. The average time it takes for each heating furnace slab to reach the preset point during this collection period can then be calculated as the preset warning time for the corresponding heating furnace. Taking three heating furnaces as an example, the three heating furnaces are labeled No. 1, No. 2 and No. 3 respectively. The No. 1, No. 2 and No. 3 heating furnaces are arranged from left to right. Taking the heat detection HMD201 as an example, the sensor continuously measures the time from the completion of the exit of 20 slabs from heating furnaces No. 1, No. 2 and No. 3 to the transfer to HMD201. The average value is taken as the preset warning time of the slab exiting the furnace from each heating furnace to HMD201. The average value of the measurements shows that the preset warning time of heating furnace No. 1 is 58s, the preset warning time of heating furnace No. 2 is 40s and the preset warning time of heating furnace No. 3 is 25s.

[0027] In one embodiment, after determining the preset warning time corresponding to each heating furnace, the method further includes: periodically acquiring the time it takes for the slab of each heating furnace to be conveyed to a preset point, so as to update the preset warning time corresponding to each heating furnace.

[0028] In one embodiment, if the current slab does not reach the preset point of the rear roller conveyor within the corresponding preset warning time after exiting the furnace, an alarm message is generated.

[0029] Specifically, after the slabs from heating furnaces No. 1, 2, and 3 are discharged, if they do not reach HMD201 within the preset warning time, the discharge control room will automatically issue an audible and visual alarm. For example, if the slab from furnace No. 1 does not reach HMD201 within 58 seconds after discharge (no rising edge signal of HMD201 arrives after 58 seconds), the discharge control room will automatically issue an audible and visual alarm. Of course, other alarm information can also be used, such as outputting prompt text or voice broadcasting. The specific settings can be configured according to actual application requirements, and there are no restrictions here.

[0030] In one embodiment, the time difference between the current time and the slab tapping time can be used to determine whether the slabs of heating furnaces No. 1, No. 2, and No. 3 have reached the preset point HMD201 within the corresponding preset warning time, so as to determine whether the next slab should execute the automatic tapping command. If the current slab has not reached HMD201 after being tapped, and the next slab tapping command is received, the tapping action of the next slab is paused. That is, the tapping machine of the next heating furnace to be tapped will not execute the tapping action (when the tapping machine reaches the lower position, the primary control system will send the tapping completion signal to the secondary system, and the secondary system will automatically extract the tapping data from the heating furnace and send the corresponding slab tapping message to the secondary system of the rolling line). If the next slab does not execute the tapping action, the next slab and its data will not be automatically extracted from the heating furnace, so as to ensure that the tapping data of the previous slab that has been tapped but has not yet reached HMD201 will not be overwritten by the tapping data of the next slab.

[0031] Step S110: After the arrival signal of the current slab is detected at the preset point, the tapping action of the next slab is executed so as to send the tapping data of the next slab to the subsequent process when the tapping machine is in the lower position.

[0032] In one embodiment, when the arrival signal of the current slab is detected at the preset point, the alarm information is cleared.

[0033] Specifically, after the operator manually transfers the slab currently resting on the rear roller conveyor to the HMD201 hot inspection box in front of the rough descaling box, the audible and visual alarm in the furnace exit control room is automatically cleared, the next slab is tapped, and the countdown calculation for subsequent slab tapping is started.

[0034] In one embodiment, after sending the tapping data of the next slab to the subsequent process when the tapping machine is in the lower position, the process further includes: initiating a countdown calculation for the tapping of the next slab, so as to control the corresponding slab to perform the tapping action after the tapping countdown is completed. Specifically, initiating an automatic tapping countdown calculation for the next slab ensures the accuracy of tracking subsequent slab physical samples and data, and ensures the continuity and stability of subsequent production.

[0035] Based on the technical solutions of the above embodiments of this application, the design defects of the existing control technology heating furnace rear roller table data tracking system can be effectively solved; at the same time, the problem of two or more furnace exit data being covered under abnormal conditions is solved, avoiding the problem of incorrect scrap steel stacking after the slab with covered data enters the subsequent process, effectively improving the rolling stability of the production line and the safety of the roughing mill equipment.

[0036] Please see Figure 2 This embodiment provides a slab control system for the roller conveyor after the heating furnace, used to execute the slab control method for the roller conveyor after the heating furnace described in the aforementioned method embodiment. Since the technical principles of the system embodiment are similar to those of the aforementioned method embodiment, the same technical details will not be repeated.

[0037] In one embodiment, a slab control system for the rear roller conveyor of a heating furnace includes: a slab tracking module 20, used to pause the tapping action of the next slab if it does not reach the preset point of the rear roller conveyor within a corresponding preset warning time after the current slab exits the furnace, and if a tapping instruction for the next slab is received, so that the next slab will not be pulled onto the rear roller conveyor; and a tapping control module 21, used to execute the tapping action of the next slab after detecting the arrival signal of the current slab at the preset point, so as to send the furnace exit data of the next slab to the subsequent process when the tapping machine is in the lower position.

[0038] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for controlling slabs on the roller conveyor after a heating furnace, characterized in that, include: If a slab does not reach the preset point on the furnace rear roller conveyor within the corresponding preset warning time after it exits the furnace, and if a steel tapping command for the next slab is received, the steel tapping action of the next slab will be paused, so that the next slab will not be pulled out onto the furnace rear roller conveyor. There are multiple heating furnaces, and the average time from the historical slab exiting the furnace to being conveyed to the preset point for each heating furnace is used as the preset warning time for the corresponding heating furnace; After determining the preset warning time for each heating furnace, the method also includes: periodically obtaining the time it takes for the slab to be conveyed to the preset point for each heating furnace, so as to update the preset warning time for each heating furnace. After the arrival signal of the current slab is detected at the preset point, the tapping action of the next slab is executed, so that the tapping data of the next slab is sent to the subsequent process when the tapping machine is in the lower position; after sending the tapping data of the next slab to the subsequent process when the tapping machine is in the lower position, the process further includes: starting the slab tapping countdown calculation after the next slab, so as to control the corresponding slab to perform the tapping action after the tapping countdown is completed.

2. The method for controlling the slab on the roller conveyor after the heating furnace according to claim 1, characterized in that, An alarm is generated if the slab fails to reach the preset point on the rear roller conveyor within the corresponding preset warning time after exiting the furnace.

3. The method for controlling the slab on the roller conveyor after the heating furnace according to claim 2, characterized in that, When the arrival signal of the current slab is detected at the preset point, the alarm information is cleared.

4. A slab control system for the roller conveyor after a heating furnace, characterized in that, include: The slab tracking module is used to pause the tapping of the next slab if it does not reach the preset point of the furnace rear roller conveyor within the corresponding preset warning time after the current slab is tapped out of the furnace, so that the next slab will not be pulled out onto the furnace rear roller conveyor. There are multiple heating furnaces, and the average time from the historical slab exiting the furnace to being conveyed to the preset point for each heating furnace is used as the preset warning time for the corresponding heating furnace; After determining the preset warning time for each heating furnace, the method also includes: periodically obtaining the time it takes for the slab to be conveyed to the preset point for each heating furnace, so as to update the preset warning time for each heating furnace. The steel tapping control module is used to execute the steel tapping action of the next slab after detecting the arrival signal of the current slab at the preset point, so as to send the tapping data of the next slab to the subsequent process when the tapping machine is in the lower position; after sending the tapping data of the next slab to the subsequent process when the tapping machine is in the lower position, it also includes: starting the slab tapping countdown calculation after the next slab, so as to control the corresponding slab to perform the steel tapping action after the steel tapping countdown is completed.

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