Coiled double-steel online tracking control method and system

Abstract

The invention provides an online tracking control method and system for double steel coiling. The method comprises the steps that a steel biting signal and a steel throwing signal of current strip steel on a finish rolling tail rack are obtained; calculating the tracking distance of the current strip steel according to the steel biting signal and the steel throwing signal; and when the tracking distance reaches a preset thermal detection window area at the outlet end of a finish rolling tail rack, head and tail tracking position correction is conducted on the current strip steel according to a strip steel entering signal or leaving signal of the thermal detection window area, and corrected strip steel head and tail position information is obtained. The problem that double-steel tracking and control cannot be achieved in the coiling area is solved, and the accuracy of double-steel tracking in the coiling area is improved.

Description

Technical Field

[0001] The invention relates to the application field of steel production, and in particular to an online tracking control method and system for coiling double steel.

[0002] Background technology The existing coiling unit of the hot coil production line of the steel rolling mill cannot realize online tracking and control of double steel, that is, when the tail of the previous strip has not entered the coiler and the next coiler to be used is not ready, the next intermediate billet is not allowed to enter the finishing rolling F1 frame for steel biting rolling, and stays on the front roller of the F1 frame to wander back and forth. It can only be rolled on the F1 frame after the next coiler is ready, resulting in a large temperature drop of the wandering intermediate billet, affecting the head threading and rolling stability. When the rolling rhythm is too fast and the previous strip has not been unloaded, the preset parameters of the next strip coiling will cover the set parameters of the previous strip after being issued, resulting in the previous strip tracking error, unable to unload normally, affecting production stability. Summary of the invention

[0003] In view of the above problems existing in the prior art, the present invention proposes a coiling double steel online tracking control method and system, which mainly solves the problem that the existing hot coil production line cannot achieve double steel online tracking in the coiling area.

[0004] In order to achieve the above purpose and other purposes, the technical solution adopted by the present invention is as follows.

[0005] The present application provides a method for online tracking and control of coiling double steel, comprising: obtaining a steel biting signal and a steel throwing signal of a current steel strip at a final stand of a finishing mill; calculating a tracking distance of the current steel strip according to the steel biting signal and the steel throwing signal; when the tracking distance reaches a preset heat detection window area at an exit end of the final stand of the finishing mill, performing a head and tail tracking position correction on the current steel strip according to a strip entry signal or a strip exit signal in the heat detection window area, so as to obtain corrected strip head and tail position information.

[0006] In one embodiment of the present application, before obtaining the steel biting signal and steel throwing signal of the current strip at the last stand of finishing rolling, it also includes: when the first stand of finishing rolling bites steel, obtaining the signal of the coiler body, if the signal of the coiler body indicates that the coiler is not ready, then outputting the alarm information corresponding to the coiling not being ready; if the signal of the coiler body indicates that the coiler is ready, then the first stand of finishing rolling bites steel normally; if after normally biting steel, the strip enters the preset detection point of finishing rolling, obtaining the coiling valve signal; when the coiling valve signal indicates that the coiling valve is not ready, forcibly switching to the next coiler for coiling, and outputting the alarm information corresponding to the switching coiler.

[0007] In one embodiment of the present application, when the coiler body signal indicates that the coiler is ready, it also includes: obtaining coiling preset data and storing it in a first buffer area; after the target finishing stand bites steel, determining whether the second buffer area is occupied, and if occupied, detecting the second buffer area at a preset time interval frequency until the last finishing stand bites steel or the second buffer area is not occupied, then writing the coiling preset data into the second buffer area.

[0008] In one embodiment of the present application, after obtaining the preset coiling data and storing it in the first buffer area, it also includes: setting the identification bit of the first buffer area to the first identification value corresponding to the steel, and resetting the identification bit of the first buffer area after the preset coiling data in the second buffer area is successfully written.

[0009] In one embodiment of the present application, after writing the preset coiling data into the second buffer area, it also includes: setting the identification bit of the second buffer area to a second identification value corresponding to steel, and resetting the second buffer area after delaying a preset time after receiving a coiler biting steel signal.

[0010] In one embodiment of the present application, after obtaining the corrected strip head and tail position information, it also includes: transmitting the target width setting value and target thickness setting value of the current rolling of the finishing mill to the corresponding coiler controller, so that the coiler controller compares the coiling preset data with the target width setting value and the target thickness setting value to determine the deviation value; if the deviation value exceeds the preset deviation threshold, the target width setting value and the target thickness setting value are used as the coiling preset values.

[0011] The present application also provides a coiling double-steel online tracking control system, including: a signal acquisition module, used to obtain the steel biting signal and steel throwing signal of the current strip in the final finishing stand; a distance calculation module, used to calculate the tracking distance of the current strip according to the steel biting signal and the steel throwing signal; a tracking correction module, used to correct the head and tail tracking position of the current strip according to the strip entering signal or leaving signal of the heat inspection window area when the tracking distance reaches the preset heat inspection window area at the exit end of the final finishing stand, so as to obtain the corrected strip head and tail position information.

[0012] As described above, the present invention provides a method and system for online tracking control of coiling double steel, which has the following beneficial effects.

[0013] The present application tracks the position of the head and tail of the strip through the steel biting signal and steel throwing information of the final stand of the finishing rolling mill, and corrects the tracking position of the head and tail of the strip when the strip reaches the heat inspection window area. Before correction, it determines whether the strip has reached the heat inspection window area based on the tracking distance. The head and tail tracking position correction is performed only when the tracking position matches the heat inspection signal. Even if the heat inspection window does not detect the strip or the strip arrives ahead of time, it does not affect the accuracy of the tracking of the head and tail positions of the strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a flow chart of a method for online tracking and controlling a double-steel coiling machine in one embodiment of the present application.

[0015] Figure 2 This is a module diagram of a coiling double steel online tracking control system in one embodiment of the present application. DETAILED DESCRIPTION

[0016] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0017] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0018] The inventors have found that:

[0019] The existing coiling unit of the hot coil production line of the steel rolling mill cannot achieve online tracking and control of double steels, that is, when the tail of the previous strip has not entered the coiler and the next coiler to be used is not ready, the next intermediate billet is not allowed to enter the finishing rolling F1 stand (the first finishing rolling stand) for biting steel rolling. It stays on the front roller of the F1 stand and wanders back and forth. It can only be rolled on the F1 stand after the next coiler is ready, resulting in a large temperature drop in the intermediate billet wandering back and forth. In the actual production process, due to the fast rolling rhythm of the production line, it often happens that when the tail of the previous strip has not yet entered the coiler after throwing the steel in the finishing rolling F7 frame (finishing rolling end frame), the next intermediate billet has entered the F1 frame to bite the steel, resulting in the failure to store the secondary coiling pre-set parameters (F1 frame steel biting setting parameters) after the next intermediate billet F1 frame bites the steel (the previous strip coiling pre-set parameters are still stored in the buffer area), resulting in the coiler slowing down and piling steel in advance before the tail of the previous strip is set; at the same time, when the next strip enters the F7 frame to bite the steel, since there is still no ready coiler available, the head position tracking error of the next strip will be caused, and steel will be piled in front of the guide plate on the entrance side of the 1# coiler, which seriously affects the stable and smooth production of the production line and the improvement of the rolling rhythm. The main problems of the existing control technology are as follows:

[0020] 1. The existing control technology coiler cannot meet the requirements of double steel online tracking and control. When the rolling rhythm is too fast, the tail of the previous strip will slow down and pile up in advance, and the head of the next strip will track incorrectly and pile up at the entrance of the 1# coiler;

[0021] 2. The existing control technology does not allow the next intermediate billet to enter the F1 stand for rolling before the previous strip has been tailed, which affects the rolling rhythm of the production line and the improvement of production capacity;

[0022] 3. There is only one buffer for the existing coiling pre-set parameters. When the rolling rhythm is too fast and the previous strip has not been unloaded, the next strip coiling pre-set parameters will overwrite the previous strip coil setting parameters after they are issued, resulting in tracking errors for the previous strip.

[0023] 4. The existing control technology does not provide any alarm when the F1 frame bites the steel when the next coiler is not ready, resulting in no coiler available after the strip head leaves the F7 frame, and finally steel piles up at the guide plate on the entrance side of the 1# coiler.

[0024] Based on the above problems existing in the prior art, the present application proposes a method and system for online tracking control of double steel coiling. The technical solution of the present application is elaborated in detail below in conjunction with specific embodiments.

[0025] See also Figure 1 , Figure 1 This is a flow chart of a method for online tracking and controlling a coiling double steel in an embodiment of the present application. The method provided in the embodiment of the present application includes:

[0026] Step S100, obtaining the steel biting signal and steel throwing signal of the current strip steel in the final stand of the finishing rolling mill.

[0027] In one embodiment, the position tracking of the head and tail of the strip takes the steel biting and steel throwing signals of the last finishing stand (F7 stand) as the tracking starting point, and the types of steel biting and steel throwing of the current strip in the finishing F7 stand can be collected by sensors. When the steel biting signal is detected, it means that the head of the strip has reached the finishing F7 stand, and when the steel throwing signal is detected, it means that the tail of the strip is about to leave the finishing F7 stand.

[0028] Step S110, calculating the tracking distance of the current steel strip according to the steel biting signal and the steel throwing signal.

[0029] In one embodiment, after obtaining the steel biting signal and the steel throwing signal, the position distance of the head of the strip in the time period from steel biting to the specified time can be calculated according to the transmission speed and rolling speed of the strip in the finishing mill, as the head tracking distance. Similarly, the tail tracking distance can also be determined according to the steel throwing signal. The specific calculation process can be set and adjusted according to the differences in set parameters of different production lines, and there is no limitation here.

[0030] Step S120, when the tracking distance reaches the preset heat detection window area at the exit end of the finishing mill, the head and tail tracking position of the current strip is corrected according to the strip entry signal or exit signal of the heat detection window area to obtain the corrected strip head and tail position information.

[0031] In one embodiment, a tracking correction window can be set. When the strip head and tail position tracking reaches a window of the physical position of a heat inspection (i.e., the heat inspection window area), the heat inspection detects the strip entering or leaving the signal and automatically performs the head and tail tracking position correction. If the tracking distance is not within the window when the heat inspection detects the strip entering or leaving the signal, the head and tail tracking position correction is not performed; thereby ensuring that the accuracy of the strip head and tail position tracking will not be affected when the heat inspection does not come or comes early. Heat inspection can use sensors such as hot metal detectors, and of course other devices can be used to realize the heat inspection function according to needs.

[0032] In one embodiment, before obtaining the steel biting signal and steel throwing signal of the current strip at the last stand of finishing rolling, it also includes: when the first stand of finishing rolling bites steel, obtaining the coiler body signal, if the coiler body signal indicates that the coiler is not ready, then outputting the alarm information corresponding to the coiling not being ready; if the coiler body signal indicates that the coiler is ready, then the first stand of finishing rolling bites steel normally; if after normally biting steel, the strip enters the preset detection point of finishing rolling, obtaining the coiling valve signal; when the coiling valve signal indicates that the coiling valve is not ready, forcibly switching to the next coiler for coiling, and outputting the alarm information corresponding to the switching coiler.

[0033] Specifically, the ready signal of the coiler body (including the reel, the roll gap of the auxiliary coiling roller, the coil unloading trolley, etc.) and the ready signal of the coiler valve are separated. If the F1 frame bites the steel when the coiler body is not ready, the alarm message "coiling is not ready" will be automatically popped up on the finishing rolling main monitoring HMI screen; if the coiler body is ready, the F1 frame can bite the steel normally. When the strip head enters the heat inspection area, if the valve signal of the coiler whose current body is ready is not ready, the next coiler will be automatically forced to switch, and the alarm message "automatically switch the coiler" will be automatically popped up.

[0034] In one embodiment, when the coiler body signal indicates that the coiler is ready, it also includes: obtaining coiling preset data and storing it in a first buffer area; after the target finishing stand bites steel, determining whether the second buffer area is occupied, and if occupied, detecting the second buffer area at a preset time interval frequency until the last finishing stand bites steel or the second buffer area is not occupied, then writing the coiling preset data into the second buffer area.

[0035] In one embodiment, after obtaining the preset coiling data and storing it in the first buffer area, it also includes: setting the identification bit of the first buffer area to the first identification value corresponding to the steel, and resetting the identification bit of the first buffer area after the preset coiling data in the second buffer area is successfully written.

[0036] Specifically, the B0 pre-set buffer area for coiling double steel rolling is divided into two buffer areas, B01 (i.e., the first buffer area) and B02 (i.e., the second buffer area) according to the fast-paced requirements of fine rolling of double steel. When the F1 frame bites steel, the second level selects to send the coiling pre-set data according to the coiler ready signal, and the data automatically enters the B01 buffer area. At the same time, a steel flag is established in the B01 buffer area (such as setting the first flag value to 1, and the initial value is 0). After the F4 frame bites steel, it checks whether the B02 buffer area is occupied (whether there is steel in the buffer area). If the buffer area B02 is occupied, wait and judge whether the B02 buffer area is still occupied every 1s until the F7 frame bites steel; if the B02 buffer area is not occupied, set the data to be written into the B02 buffer area.

[0037] Establish the cache area B02 occupation flag (second identification value), automatically reset the B01 steel presence flag after B02 is written successfully (the first identification value is reset to the initial value), and automatically reset the B02 occupation flag after any coiler bites steel for 1 second. Cache area B02 can receive new setting data.

[0038] In one embodiment, after obtaining the corrected strip head and tail position information, it also includes: transmitting the target width setting value and target thickness setting value of the current rolling of the finishing mill to the corresponding coiler controller, so that the coiler controller compares the coiling preset data with the target width setting value and the target thickness setting value to determine the deviation value; if the deviation value exceeds the preset deviation threshold, the target width setting value and the target thickness setting value are used as the coiling preset values.

[0039] Specifically, a "finishing rolling double steel" sign and screen alarm information are added and transmitted to the layer cooling PLC controller. The layer cooling PLC starts the double steel tracking and control logic according to the finishing rolling double steel sign. At the same time, two signals are added to the newly added channel: the target width and target thickness setting values ​​used by the finishing mill. After these two signals are transmitted to the coiling controller, they are compared with the secondary preset data received by the coiling. If the deviation is large (the thickness deviation exceeds ±0.05mm, and the width deviation exceeds ±5mm), the finishing transmission data is used as the coiling preset value to avoid scrap steel accidents caused by setting errors when the secondary rolling does not send the settings to the coiling when changing specifications.

[0040] Based on the technical solutions of the above embodiments of the present application, the problem that the coiling unit of the existing control technology cannot realize online tracking and control of double steel, and the head and tail position tracking of the strip is wrong and piled up when the rolling rhythm is fast is effectively solved; the problem that the existing coiling unit cannot realize online tracking and control of double steel, which restricts the rolling rhythm and capacity improvement of the production line is solved; the problem that the pre-set parameters of coiling are overwritten when the rolling rhythm is fast is solved; the problem that there is no coiler ready for use when the F1 frame bites steel, the existing system has no alarm prompt, and steel is still fed to the coiler, resulting in the problem of strip steel piling up on the guide plate on the entrance side of the 1# coiler is solved.

[0041] See also Figure 2 , Figure 2 This is a module diagram of the coiling double steel online tracking control system in one embodiment of the present application. The system includes: a signal acquisition module 20, which is used to obtain the steel biting signal and steel throwing signal of the current strip in the final stand of the finishing mill; a distance calculation module 21, which is used to calculate the tracking distance of the current strip according to the steel biting signal and the steel throwing signal; a tracking correction module 22, which is used to correct the head and tail tracking position of the current strip according to the strip steel entry signal or exit signal in the thermal inspection window area when the tracking distance reaches the preset thermal inspection window area at the exit end of the final stand of the finishing mill, so as to obtain the corrected strip steel head and tail position information.

[0042] The specific execution process of the system has been described in detail in the aforementioned method embodiment, and will not be repeated here.

[0043] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may 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 a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for online tracking and controlling a coiling double steel, characterized in that: include: Obtain the current steel strip biting signal and steel throwing signal in the final stand of finishing rolling; Calculating the tracking distance of the current strip according to the steel biting signal and the steel throwing signal; When the tracking distance reaches the preset heat inspection window area at the exit end of the finishing mill, the head and tail tracking position of the current strip is corrected according to the strip entry signal or exit signal of the heat inspection window area to obtain the corrected strip head and tail position information.

2. The method for online tracking and controlling the coiling double steel according to claim 1 is characterized in that: Before obtaining the current strip steel biting signal and steel throwing signal in the finishing rolling end stand, it also includes: When the first stand of the finishing rolling mill bites the steel, a coiler body signal is obtained. If the coiler body signal indicates that the coiler is not ready, an alarm message corresponding to the coiler not being ready is output; If the coiler body signal indicates that the coiler is ready, the first stand of the finishing rolling mill bites the steel normally; If the strip enters the preset detection point of finishing rolling after normal biting, the coiling valve signal is obtained; When the coiling valve signal indicates that the coiling valve is not ready, the coiling machine is forced to switch to the next coiler for coiling, and an alarm message corresponding to the switching coiler is output.

3. The method for online tracking and controlling the coiling double steel according to claim 2 is characterized in that: When the coiler body signal indicates that the coiler is ready, the method further comprises: Acquire preset coiling data and store it in a first buffer area; After the target finishing mill bites steel, determine whether the second buffer area is occupied. If occupied, check the second buffer area at a preset time interval until the last finishing mill bites steel or the second buffer area is not occupied, then write the preset coiling data into the second buffer area.

4. The method for online tracking and controlling the coiling double steel according to claim 3 is characterized in that: After obtaining the preset coiling data and storing it in the first cache area, it also includes: setting the identification bit of the first cache area to the first identification value corresponding to the steel, and resetting the identification bit of the first cache area after the preset coiling data in the second cache area is successfully written.

5. The method for online tracking and controlling the coiling double steel according to claim 4 is characterized in that: After writing the preset coiling data into the second buffer area, it also includes: setting the identification bit of the second buffer area to a second identification value corresponding to steel, and resetting the second buffer area after delaying a preset time after receiving a coiler biting steel signal.

6. The method for online tracking and controlling the coiling double steel according to claim 4 is characterized in that: After obtaining the corrected strip head and tail position information, it also includes: The target width setting value and the target thickness setting value of the finishing mill are transmitted to the corresponding coiler controller, so that the coiler controller compares the coiling preset data with the target width setting value and the target thickness setting value to determine the deviation value; If the deviation value exceeds the preset deviation threshold, the target width setting value and the target thickness setting value are used as the winding preset values.

7. A coiling double steel online tracking control system, characterized in that: include: The signal acquisition module is used to obtain the steel biting signal and steel throwing signal of the current strip in the finishing rolling end stand; A distance calculation module, used for calculating the tracking distance of the current strip according to the steel biting signal and the steel throwing signal; The tracking correction module is used to correct the head and tail tracking position of the current strip according to the strip entry signal or exit signal of the heat inspection window area when the tracking distance reaches the preset heat inspection window area at the exit end of the finishing rolling end stand, so as to obtain the corrected strip head and tail position information.

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