A layer cold strip tracking control method and system

Abstract

The present application provides a laminar cooling strip tracking control method and system, the method comprising: sampling the rolling speed of the finishing stand when the finishing stand bites steel, obtaining the first actual rolling speed of the finishing stand in different sampling cycles; determining the first tracking position of the strip head in the laminar cooling area based on the first actual rolling speed; when a steel signal is detected at a preset signal point in the laminar cooling area, correcting the first tracking position based on the deviation between the preset signal point and the first tracking position, obtaining the first actual position of the strip head. The present application can effectively improve the accuracy of tracking the head and tail positions of the strip in the laminar cooling area, avoid scrap steel pile accidents caused by abnormal tracking of the head and tail positions of the strip, and effectively ensure product quality control accuracy and rolling stability.

Description

Technical Field

[0001] The present invention relates to the application field of steel production and manufacturing, and in particular to a layer cold strip steel tracking control method and system. Background Art

[0002] The existing laminar cooling process control technology has inaccurate tracking of the head and tail of the strip in the laminar cooling area. Due to the delay in the transmission of the steel biting signal of the finishing rolling F7 stand and the inaccurate calculation of the head tracking position, the control of the non-cooling or slightly cooling section of the strip head is abnormal, and the deviation between the control distance of the non-cooling or slightly cooling head and the planned control distance is large, affecting the control accuracy of the strip head coiling temperature and product performance; due to the delay in the transmission of the steel throwing signal of the finishing rolling F7 stand and the inaccurate calculation of the tail tracking position, the deviation between the calculated position of the strip tail in the laminar cooling area and the actual strip tail position is large, and the calculated tracking position of the strip tail often occurs in advance, and the actual strip tail position does not reach the coiler, resulting in the control system completing the tail positioning in advance and the reel slowing down and piling steel in advance, affecting stable and smooth production. Summary of the Invention

[0003] In view of the above problems existing in the existing control technology, the present invention proposes a layer-cooled strip tracking control method and system, which mainly solves the problem that the existing layer-cooled area strip head and tail position tracking is inaccurate, resulting in low strip product quality control accuracy and affecting stable production.

[0004] In order to achieve the above-mentioned and other purposes, the technical solutions adopted by the present invention are as follows.

[0005] The present application provides a layer cold strip tracking control method, comprising:

[0006] Sampling the rolling speed of the final finishing stand when the final finishing stand bites steel, to obtain the first actual rolling speed of the final finishing stand in different sampling periods;

[0007] determining a first tracking position of a strip head in a laminar cooling region according to the first actual rolling speed;

[0008] When a steel signal is detected at a preset signal point in the laminar cooling area, the first tracking position is corrected according to a deviation value between the preset signal point and the first tracking position to obtain a first actual position of the strip head.

[0009] In one embodiment of the present application, after determining the first tracking position of the strip head in the laminar cooling zone according to the first actual rolling speed, the method further includes:

[0010] Performing real-time detection on the finishing rolling last stand steel throwing signal to obtain the last stand steel throwing signal;

[0011] Conduct real-time detection of coiler reel bite signal to obtain reel bite signal;

[0012] The tracking calculation method of the strip tail is determined according to the last stand steel throwing signal and the reel steel biting signal, so as to determine the second tracking position of the strip tail according to the tracking calculation method and correct the second tracking position.

[0013] In one embodiment of the present application, a tracking calculation method for determining the strip tail according to the last stand steel throwing signal and the reel steel biting signal includes:

[0014] According to the last stand steel throwing signal and the reel steel biting signal, it is determined that the reel has bitten the steel when the last stand of finishing rolling throws the steel, and the reel speed is sampled to obtain the actual reel speed of the reel in different sampling periods;

[0015] determining a second tracking position of the tail of the strip in the laminar cooling region according to the actual reel speed;

[0016] When a steel-free signal is detected at a preset signal point in the laminar cooling area, the second tracking position is corrected according to a deviation value between the preset signal point and the second tracking position to obtain a second actual position of the tail of the strip.

[0017] In one embodiment of the present application, a tracking calculation method for determining the strip tail according to the last stand steel throwing signal and the reel steel biting signal includes:

[0018] According to the steel throwing signal of the final stand and the steel biting signal of the reel, it is determined that the reel does not bite the steel when the final stand of the finishing rolling mill throws the steel, and the rolling speed of the final stand of the finishing rolling mill is sampled to obtain the second actual rolling speed of the final stand of the finishing rolling mill in different sampling periods. After the reel bites the steel, the reel speed is switched to be sampled;

[0019] determining a second tracking position of the tail of the strip in the laminar cooling region according to the second actual rolling speed;

[0020] When a steel-free signal is detected at a preset signal point in the laminar cooling area, the second tracking position is corrected according to a deviation value between the preset signal point and the second tracking position to obtain a second actual position of the tail of the strip.

[0021] In one embodiment of the present application, determining a first tracking position of a strip head in a laminar cooling region according to the first actual rolling speed includes:

[0022] Calculate the proportion of each sampling period in the total sampling time;

[0023] Calculating a tracking position increment of the strip head according to the proportion and a first actual rolling speed corresponding to a sampling period;

[0024] The position of the strip head is accumulated according to the tracking position increment to obtain the first tracking position corresponding to the current sampling period.

[0025] In one embodiment of the present application, before correcting the first tracking position according to the deviation between the preset signal point and the first tracking position, the method further includes:

[0026] A temperature detection unit is configured at a plurality of signal points in the laminar cooling area, so as to output a steel presence signal and a steel absence signal through the temperature detection unit;

[0027] The signal point position configured with a temperature detection unit is used as the preset signal point position, and each of the preset signal point positions is configured with at least two temperature detection units, one of which is used as a redundant detection unit, so that when the currently working temperature detection unit is abnormal, the redundant detection unit is started to continue to complete temperature detection and signal output.

[0028] In one embodiment of the present application, correcting the first tracking position according to the deviation between the preset signal point and the first tracking position includes:

[0029] If the position of the preset signal point is greater than the first tracking position, the strip head is moved forward to the position of the preset signal point;

[0030] If the position of the preset signal point is smaller than the first tracking position, the strip head is moved back to the position of the preset signal point.

[0031] The present application also provides a layer cold strip tracking control system, comprising:

[0032] A speed sampling module is used to sample the rolling speed of the final finishing stand when the final finishing stand bites steel, and obtain the first actual rolling speed of the final finishing stand in different sampling periods;

[0033] a position tracking module, configured to determine a first tracking position of a head of the strip in a laminar cooling region according to the first actual rolling speed;

[0034] The position correction module is used to correct the first tracking position according to the deviation value between the preset signal point and the first tracking position when a steel signal is detected at the preset signal point in the laminar cooling area, so as to obtain the first actual position of the strip head.

[0035] As described above, the present invention provides a layer cold strip tracking control method and system, which have the following beneficial effects.

[0036] This application samples the rolling speed of the finishing rolling mill stand in real time, and based on the sampling period and the first actual rolling speed within the sampling period, the tracking position change of the strip head in the corresponding sampling period can be determined, and then the strip head position is tracked based on the tracking position change to determine the first tracking position of the strip head, and when a preset signal point is set in the layer cooling area and a steel signal is detected, the first tracking position is corrected according to the position of the preset signal point. This application can effectively improve the strip head position tracking accuracy, and can effectively improve the rolling stability and the strip head quality control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a flow chart of a method for tracking and controlling a middle layer of cold strip steel in one embodiment of the present application.

[0038] Figure 2 This is a module diagram of the middle layer cold strip steel tracking control system in one embodiment of the present application. DETAILED DESCRIPTION

[0039] The following describes the embodiments of the present invention through specific examples. 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. The 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 the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0040] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not 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 complex.

[0041] The inventors have discovered that:

[0042] The laminar cooling system of the hot coil production line of the steel rolling mill consists of a quick cooling section, a coarse adjustment section, a quick cooling section two, and a fine adjustment section, with a total of 100 sets of cooling valves. Among them, the quick cooling section one has 3 tilting frames with a total of 12 sets of valves, the coarse adjustment section has 12 tilting frames with a total of 48 sets of valves, the quick cooling section two has 2 tilting frames with a total of 16 sets of valves, and the fine adjustment section has 3 tilting frames with a total of 24 sets of valves. The existing control technology is inaccurate in tracking the head and tail of the cold strip. Due to the delay in the transmission of the finishing rolling F7 steel biting signal and the inaccurate calculation of the head tracking position, the tracking of the head of the cold strip is delayed by 2-3s, resulting in a large deviation between the control distance of the special cooling of the strip head (no cooling or slight cooling of the head) and the planned control distance, affecting the control accuracy of the strip head coiling temperature control and product performance; due to the delay in the transmission of the finishing rolling F7 steel throwing signal and the inaccurate calculation of the tail tracking position, the calculated position of the tail of the cold strip deviates greatly from the actual strip tail position. It is often the case that the control system calculates the tail tracking position in advance, and the actual strip tail position has not reached the coiler, resulting in the control system completing the tail positioning in advance and the reel slowing down and piling steel in advance, affecting stable and smooth production.

[0043] Based on the problems existing in the above-mentioned existing technical solutions, the present application proposes a layer cold strip tracking control method and system. The technical solution of the present application is described in detail below with reference to specific embodiments.

[0044] See also Figure 1 The present invention provides a layer cold strip tracking control method, the method comprising the following steps:

[0045] Step S100: sampling the rolling speed of the final finishing stand when the final finishing stand bites steel, and obtaining the first actual rolling speed of the final finishing stand in different sampling periods.

[0046] In one embodiment, taking the finishing rolling F1-F7 stands as an example, the finishing rolling end stand corresponds to the finishing rolling F7 stand. The tracking position of the strip head is calculated based on the integration of the F7 rolling speed. Before calculating the tracking position, the rolling speed of the finishing rolling end stand needs to be sampled in real time. Specifically, a sensor unit can be set at the entrance of the finishing rolling end stand to detect whether the finishing rolling end stand bites the steel, wherein the sensor unit can be a pressure sensor or the like. The collected steel biting signal of the finishing rolling end stand is used as the sampling starting time point of the rolling speed. Based on the sampling starting time point, multiple cycles of speed sampling are performed to obtain the rolling speed of the finishing rolling end stand corresponding to each sampling cycle, which is recorded as the first actual rolling speed. Subsequently, the head tracking position integral calculation can be performed based on the first actual rolling speed to complete the strip head position tracking.

[0047] Step S110: determining a first tracking position of the strip head in the laminar cooling zone according to the first actual rolling speed.

[0048] In one embodiment, the first tracking position of the strip head in the laminar cooling area is determined according to the first actual rolling speed, including: calculating the proportion of each sampling period in the total sampling time; calculating the tracking position increment of the strip head according to the proportion and the first actual rolling speed of the corresponding sampling period; accumulating the tracking position of the strip head according to the tracking position increment to obtain the first tracking position corresponding to the current sampling period.

[0049] Specifically, speed sampling can be performed through the basic automation controller. The controller's scanning cycle and total sampling time can be pre-set. After the finishing strip head is threaded, the actual rolling speed of F7 is used to calculate the strip head position. The specific calculation method is as follows:

[0050]

[0051] Where: n is the sampling period, Hn is the calculated value of the strip head position in the nth sampling period, H n-1 is the calculated value of the strip head position in the n-1th sampling period, X n is the F7 rolling speed value of the nth cycle, Ta is the scanning cycle of the controller, and Ti is the total sampling time, which can be configured as 1000ms. For example, if the F7 rolling speed of the strip in the nth cycle is 10m / s and the scanning cycle of the controller is 10ms, then the accumulated value of the strip head tracking position in the nth cycle is: 10ms / 1000ms×10m / s=0.1mm.

[0052] Step S120: When a steel signal is detected at a preset signal point in the laminar cooling area, the first tracking position is corrected according to a deviation value between the preset signal point and the first tracking position to obtain a first actual position of the strip head.

[0053] In one embodiment, before correcting the first tracking position according to the deviation value between the preset signal point and the first tracking position, it also includes: configuring temperature detection units at multiple signal points in the laminar cooling area to output steel-presence signals and no-steel signals through the temperature detection units; the signal points configured with temperature detection units are used as the preset signal points, and each of the preset signal points is configured with at least two temperature detection units, one of which is used as a redundant detection unit, so that when the currently working temperature detection unit is abnormal, the redundant detection unit is started to continue to complete temperature detection and signal output.

[0054] Specifically, the temperature detection unit can use a pyrometer, and two pyrometers are added after coarse adjustment stage 2, coarse adjustment stage 7, and rapid cooling stage 2 (one pyrometer is put into use online, and the other pyrometer is used as a redundant detection unit in standby. This pyrometer has strong resistance to water accumulation and water vapor and mist interference). The position of the strip head is tracked and corrected based on the steel signals from the pyrometers at the outlet of coarse adjustment stage 2, coarse adjustment stage 7, coarse adjustment stage 12, rapid cooling stage 2, and the layer cooling area. The specific location of the temperature detection unit can be selected and adjusted according to actual application requirements and is not limited here.

[0055] In one embodiment, the first tracking position is corrected according to the deviation value between the preset signal point and the first tracking position, including: if the position of the preset signal point is greater than the first tracking position, the head of the strip is moved forward to the position of the preset signal point; if the position of the preset signal point is smaller than the first tracking position, the head of the strip is moved backward to the position of the preset signal point.

[0056] Specifically, according to the existing length of the layer cooling area and the design position of the cooling water valve, two pyrometers with strong anti-interference ability (which can penetrate water and water vapor and mist on the surface of the strip) are added after the coarse adjustment stage 2, coarse adjustment stage 7, and rapid cooling stage 2. The original pyrometers are used at the coarse adjustment stage 12 and the outlet of the layer cooling area. The strip head tracking position is corrected according to the steel detection signal of the pyrometers at the outlet of the coarse adjustment stage 2, coarse adjustment stage 7, coarse adjustment stage 12, rapid cooling stage 2, and the layer cooling area. The signal point where the pyrometer is set can be used as the preset signal point. The specific calculation method of the position correction can be expressed as follows:

[0057] H 实际 =H 计算 +W

[0058] Among them: H 实际 is the corrected strip head tracking position, H 计算 The control system calculates the strip head tracking position, and W is the correction value after the pyrometer detects the steel signal. For example, the control system calculates the strip head tracking position as 42m (42m forward from the layer cooling area tracking starting point). After coarse adjustment 7, the pyrometer detects the steel signal (45m forward from the layer cooling area tracking starting point). Then the actual strip head tracking position is automatically corrected 3m forward, H 实际 =42m+3m=45m, the backward correction method of the strip head tracking position is similar to the correction method of the heads of other pyrometer signal points, and the strip head tracking position layer cold area is corrected 5 times in total.

[0059] In one embodiment, the finishing rolling last stand steel throwing signal is detected in real time to obtain the last stand steel throwing signal; the coiler reel steel biting signal is detected in real time to obtain the reel steel biting signal; the tracking calculation method of the strip tail is determined based on the last stand steel throwing signal and the reel steel biting signal, so as to determine the second tracking position of the strip tail according to the tracking calculation method, and the second tracking position is corrected.

[0060] Due to signal transmission delays during the finishing mill F7 steel casting and inaccurate tail tracking position calculation, the calculated position of the cold strip tail deviates significantly from the actual strip tail position. This often results in the calculated tail tracking position being ahead of the actual strip tail position before it reaches the coiler. This causes the control system to complete tail positioning prematurely, leading to premature coil speed reduction and steel accumulation, impacting stable and smooth production. Therefore, it is necessary to track and correct the strip tail position to improve strip tail tracking accuracy and avoid steel accumulation accidents caused by premature tail positioning. There are two scenarios when performing strip tail tracking correction: one is when the coil bites the steel during the finishing mill F7 steel casting, and the other is when the coil does not bite the steel during the finishing mill F7 steel casting. Different tracking position calculation methods can be used to perform tail tracking correction for these two scenarios.

[0061] In one embodiment, a tracking calculation method for the tail of the strip is determined based on the last stand steel-throwing signal and the reel steel-biting signal, including: determining that the reel has bitten steel when the last stand of finishing rolling throws steel based on the last stand steel-throwing signal and the reel steel-biting signal, then sampling the reel speed to obtain the actual reel speed of the reel in different sampling periods; determining the second tracking position of the tail of the strip in the laminar cooling area based on the actual reel speed; when a no-steel signal is detected at a preset signal point in the laminar cooling area, correcting the second tracking position based on the deviation value between the preset signal point and the second tracking position to obtain the second actual position of the tail of the strip.

[0062] Specifically, in the case where the reel has bitten the steel when the finishing stand is throwing steel, the strip tail tracking position is calculated using the actual reel speed, that is, the reel speed is sampled. The specific calculation method can be expressed as follows:

[0063]

[0064] Where: n is the sampling period, T n is the calculated value of the strip tail position in the nth sampling period, T n-1 is the calculated value of the strip tail position in the n-1th sampling period, X nis the roll speed value (i.e., target roll speed) for the nth cycle, Ta is the controller scan period, and Ti can be configured as 1000ms. For example, if the strip roll speed for the nth cycle is 9m / s and the controller scan period is 10ms, then the accumulated value of the strip tail tracking position for the nth cycle is: 10ms / 1000ms × 9m / s = 0.09mm. Integrating this accumulated value yields the second tracking position of the strip tail.

[0065] In one embodiment, a tracking calculation method for the tail of the strip is determined based on the last stand steel-throwing signal and the reel steel-biting signal, including: determining that the reel does not bite the steel when the finishing last stand throws the steel based on the last stand steel-throwing signal and the reel steel-biting signal, sampling the rolling speed of the finishing last stand to obtain the second actual rolling speed of the finishing last stand in different sampling cycles, and then switching to sampling the reel speed after the reel bites the steel; determining the second tracking position of the tail of the strip in the laminar cooling area based on the second actual rolling speed; when a no-steel signal is detected at a preset signal point in the laminar cooling area, correcting the second tracking position based on the deviation value between the preset signal point and the second tracking position to obtain the second actual position of the tail of the strip.

[0066] In the case where the coil does not bite the steel when the finishing stand is throwing steel, the strip tail tracking position is calculated using the rolling speed of the finishing stand. That is, the rolling speed of the finishing stand is sampled, and the coil speed is then sampled after the coil bites the steel. The specific calculation method can be expressed as follows:

[0067] Before the reel bites the steel, the actual rolling speed of the last cycle before finishing rolling and throwing is used to calculate the strip tail tracking position. After the reel bites the steel, the reel speed is switched to calculate the strip tail tracking position. The specific calculation method is as follows:

[0068]

[0069] Where: n is the sampling period, T n is the calculated value of the strip tail position in the nth sampling period, T n-1 is the calculated value of the strip tail position in the n-1th sampling period, X n :If the F7 casting reel has not yet bitten the steel, then X n It is the rolling speed of the last cycle before finishing rolling. If the F7 rolling reel has bitten the steel, then X nis the reel speed value of the nth cycle, Ta is the scanning cycle of the controller, and Ti is 1000ms; for example, when the F7 stand throws steel in the nth cycle, the reel has not yet bitten the steel, the rolling speed of the last cycle before finishing rolling is 10m / s, and the scanning cycle of the controller is 10ms, then the accumulated value of the strip tail tracking position in the nth cycle is: 10ms / 1000ms×9m / s=0.1mm; the calculation method of the strip tail tracking position after the reel bites the steel is similar.

[0070] In one embodiment, the strip tail tracking position can be corrected based on the steel absence detection signal (steel presence signal disappears, the strip tail leaves the pyrometer signal point) of the pyrometers (which can penetrate water, vapor, and mist on the strip surface) at the outlet of the coarse adjustment stage 2, coarse adjustment stage 7, coarse adjustment stage 12, rapid cooling stage 2, and layer cooling area. The specific calculation method is as follows:

[0071] T 实际 =T 计算 +W

[0072] Where: T 实际 is the corrected strip tail tracking position, T 计算 The control system calculates the strip tail tracking position, and W is the correction value after the pyrometer detects the steel-free signal. For example, the control system calculates the strip tail tracking position as 48m (48m forward of the layer cooling area tracking starting point). After coarse adjustment 7, the pyrometer detects the steel-free signal (45m forward of the layer cooling area tracking starting point). Then the actual strip tail tracking position is automatically corrected 3m backward, T 实际 =48m-3m=45m, the forward correction method for the strip tail tracking position is similar to the tail correction method for the other pyrometer signal points, and the layer cold area at the strip tail position is corrected 5 times in total.

[0073] Based on the above technical solution of this application, the problem of inaccurate tracking of the head and tail positions of the strip in the layer cooling area of the existing control technology, which affects the control accuracy of the coiling temperature of the head and tail strips and product performance, can be effectively solved; it can effectively avoid the problem of inaccurate tracking of the strip head in the layer cooling area, resulting in abnormal control of the strip head's uncooling function, low coiling temperature at the head, loss of tension on the coil, and premature termination of strip tail tracking, resulting in premature deceleration of the coil and stacking of steel, affecting stable and smooth production.

[0074] See also Figure 2 This embodiment provides a layered cold strip tracking control system for executing the layered cold strip tracking control method described in the aforementioned method embodiment. Because the technical principles of the system embodiment are similar to those of the aforementioned method embodiment, the same technical details will not be reiterated.

[0075] In one embodiment, a laminar cooling strip tracking control system includes: a speed sampling module 10, which is used to sample the rolling speed of the finishing rolling stand when the finishing rolling stand bites steel, and obtain the first actual rolling speed of the finishing rolling stand in different sampling cycles; a position tracking module 11, which is used to determine the first tracking position of the strip head in the laminar cooling area according to the first actual rolling speed; and a position correction module 12, which is used to correct the first tracking position according to the deviation value between the preset signal point and the first tracking position when a steel signal is detected at a preset signal point in the laminar cooling area, and obtain the first actual position of the strip head.

[0076] 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 skilled in 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 one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A layer cold strip tracking control method, characterized in that: include: Sampling the rolling speed of the final finishing stand when the final finishing stand bites steel, to obtain the first actual rolling speed of the final finishing stand in different sampling periods; determining a first tracking position of a strip head in a laminar cooling region according to the first actual rolling speed; After determining the first tracking position of the strip head in the laminar cooling area according to the first actual rolling speed, the method further includes: performing real-time detection on the finishing rolling end stand steel throwing signal to obtain the end stand steel throwing signal; performing real-time detection on the coiler reel steel biting signal to obtain the reel steel biting signal; determining the tracking calculation method of the strip tail according to the end stand steel throwing signal and the reel steel biting signal, determining the second tracking position of the strip tail according to the tracking calculation method, and correcting the second tracking position; determining the end stand steel throwing signal and the reel steel biting signal according to the end stand steel throwing signal and the reel steel biting signal The tracking calculation method of the tail of the strip includes: determining that the reel has bitten steel when the finishing rolling last stand throws steel based on the last stand steel throwing signal and the reel biting steel signal, sampling the reel speed to obtain the actual reel speed of the reel in different sampling periods; determining a second tracking position of the tail of the strip in the laminar cooling area based on the actual reel speed; when a steel-free signal is detected at a preset signal point in the laminar cooling area, correcting the second tracking position based on a deviation value between the preset signal point and the second tracking position to obtain a second actual position of the tail of the strip; When a steel signal is detected at a preset signal point in the laminar cooling area, the first tracking position is corrected according to a deviation value between the preset signal point and the first tracking position to obtain a first actual position of the strip head.

2. The layer cold strip tracking control method according to claim 1, characterized in that: The tracking calculation method of the strip tail is determined according to the last stand steel throwing signal and the reel steel biting signal, including: According to the steel throwing signal of the final stand and the steel biting signal of the reel, it is determined that the reel does not bite the steel when the final stand of the finishing rolling mill throws the steel, and the rolling speed of the final stand of the finishing rolling mill is sampled to obtain the second actual rolling speed of the final stand of the finishing rolling mill in different sampling periods. After the reel bites the steel, the reel speed is switched to be sampled; determining a second tracking position of the tail of the strip in the laminar cooling region according to the second actual rolling speed; When a steel-free signal is detected at a preset signal point in the laminar cooling area, the second tracking position is corrected according to a deviation value between the preset signal point and the second tracking position to obtain a second actual position of the tail of the strip.

3. The layer cold strip tracking control method according to claim 1, characterized in that: Determining a first tracking position of a strip head in a laminar cooling zone according to the first actual rolling speed includes: Calculate the proportion of each sampling period in the total sampling time; Calculating a tracking position increment of the strip head according to the proportion and a first actual rolling speed corresponding to a sampling period; The position of the strip head is accumulated according to the tracking position increment to obtain the first tracking position corresponding to the current sampling period.

4. The layer cold strip tracking control method according to claim 1, characterized in that: Before correcting the first tracking position according to the deviation between the preset signal point and the first tracking position, the method further includes: A temperature detection unit is configured at a plurality of signal points in the laminar cooling area, so as to output a steel presence signal and a steel absence signal through the temperature detection unit; The signal point position configured with a temperature detection unit is used as the preset signal point position, and each of the preset signal point positions is configured with at least two temperature detection units, one of which is used as a redundant detection unit, so that when the currently working temperature detection unit is abnormal, the redundant detection unit is started to continue to complete temperature detection and signal output.

5. The layer cold strip tracking control method according to claim 4, characterized in that: Correcting the first tracking position according to a deviation between the preset signal point and the first tracking position includes: If the position of the preset signal point is greater than the first tracking position, the strip head is moved forward to the position of the preset signal point; If the position of the preset signal point is smaller than the first tracking position, the strip head is moved back to the position of the preset signal point.

6. A system for executing the layer cold strip tracking control method according to any one of claims 1 to 5, characterized in that: include: A speed sampling module is used to sample the rolling speed of the final finishing stand when the final finishing stand bites steel, and obtain the first actual rolling speed of the final finishing stand in different sampling periods; a position tracking module, configured to determine a first tracking position of a head of the strip in a laminar cooling region according to the first actual rolling speed; The position correction module is used to correct the first tracking position according to the deviation value between the preset signal point and the first tracking position when a steel signal is detected at the preset signal point in the laminar cooling area, so as to obtain the first actual position of the strip head.

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