Slab head detection method and system

Abstract

The invention discloses a slab head detection method and system, and the method comprises the steps: comparing the actual detection rolling force of the current period with the maximum detection rolling force and the minimum detection rolling force determined in the detected period according to the period in a set detection time period if the load of an F1 rack exceeds first set time; the maximum actual rolling force and the minimum actual rolling force in the set detection time period are obtained; wherein the initial value of the maximum detection rolling force is the lower limit value of a rolling force setting interval, and the initial value of the minimum detection rolling force is the upper limit value of the rolling force setting interval; according to the rolling force difference value of the maximum actual rolling force and the minimum actual rolling force, the bringing-in result of the slab head of the previous strip steel is determined; and corresponding operation is triggered according to the bringing-in result of the slab head.

Description

Technical Field

[0001] This application relates to the technical field of hot rolling, and particularly to a method and system for detecting a slab head. Background Art

[0002] In the steel rolling process, the slab first undergoes preliminary rolling through processes such as rough rolling, and then enters the flying shear section, where operations such as cutting the head, cutting the tail, and accident breaking are performed on the rolled piece after rough rolling. For example, in the production of hot-rolled strip steel, the flying shear will cut off the irregular parts such as the circular arc and swallowtail shape that may appear at the head and tail of the strip steel, allowing the intermediate billet to enter the finishing mill in a neat shape to ensure the smooth progress of the finishing process.

[0003] If the tail of the intermediate billet cannot be cut off at the flying shear, it will fall into the slag ditch at the flying shear, fine descaling or the entrance of the finishing mill, and there will also be occasional cases where the slab head is carried through the fine descaling and the transition plate area at the entrance of the finishing mill. When the next strip steel is threading, the slab head will be brought into the finishing mill to form stacked rolled scrap. Seriously, it will form an intermediate wave bulge at the entrance of F1, resulting in damage to the work roll and backup roll.

[0004] However, the existing technology can only judge whether the slab head is brought in manually. The lag in processing leads to serious steel piling up and cannot ensure the smooth progress of hot rolling. Summary of the Invention

[0005] To solve or partially solve the technical problem that the lag in handling the accident of the slab head being brought in by manual processing leads to the inability to normally execute the hot rolling process, in the first aspect of the present invention, a method for detecting a slab head is disclosed. The method includes:

[0006] If it is detected that the F1 stand is loaded for more than a first set time, within a set detection period, the actual detected rolling force in the current cycle is compared with the maximum detected rolling force and the minimum detected rolling force determined in the detected cycles respectively according to a period until the maximum actual rolling force and the minimum actual rolling force within the set detection period are obtained; wherein, the initial value of the maximum detected rolling force is the lower limit value of the rolling force setting range, and the initial value of the minimum detected rolling force is the upper limit value of the rolling force setting range;

[0007] Determine the bringing-in result of the slab head of the previous strip steel according to the rolling force difference between the maximum actual rolling force and the minimum actual rolling force;

[0008] Trigger corresponding operations according to the bringing-in result of the slab head.

[0009] Optionally, if it is detected that the F1 stand is loaded for more than a first set time, the method further includes:

[0010] Taking the moment exceeding the first set time as the starting moment, determine the set detection period.

[0011] Optionally, the actual detected rolling force in the current cycle is compared with the maximum detected rolling force and the minimum detected rolling force determined in the detected cycles respectively in a cycle until the maximum actual rolling force and the minimum actual rolling force within the set detection period are obtained. Specifically, it includes:

[0012] Compare the actual detected rolling force with the maximum detected rolling force determined in the detected cycles in a cycle; if it is greater, then take the actual detected rolling force as the maximum actual rolling force; if it is less, then take the maximum detected rolling force determined in the detected cycles as the maximum actual rolling force;

[0013] Compare the actual detected rolling force with the minimum detected rolling force determined in the detected cycles; if it is less, then take the actual detected rolling force as the minimum actual rolling force; if it is greater, then take the minimum detected rolling force determined in the detected cycles as the minimum actual rolling force.

[0014] Optionally, determining the carrying-in result of the slab head according to the rolling force difference between the maximum actual rolling force and the minimum actual rolling force specifically includes:

[0015] Compare the rolling force difference with the set rolling force difference threshold;

[0016] If the rolling force difference is greater than or equal to the set rolling force difference threshold, determine that the slab head is carried into the F1 stand.

[0017] Optionally, if it is detected that the F1 stand is loaded beyond the first set time, within the set detection period, the method further includes:

[0018] Compare the actual detected current in the current cycle with the maximum detected current and the minimum detected current determined in the detected cycles respectively in a cycle until the maximum actual current and the minimum actual current within the set detection period are obtained; wherein, the initial value of the maximum detected current is the lower limit value of the current setting range, and the initial value of the minimum detected current is the upper limit value of the current setting range;

[0019] Determine the carrying-in result of the slab head of the previous strip according to the current difference between the maximum actual current and the minimum actual current.

[0020] Optionally, comparing the actual detected current in the current cycle with the maximum detected current and the minimum detected current determined in the detected cycles respectively in a cycle until the maximum actual current and the minimum actual current within the set detection period are obtained, specifically includes:

[0021] Compare the actual detected current with the maximum detected current determined in the detected period at regular intervals; if it is greater, use the actual detected current as the maximum actual current; if it is less, use the maximum detected current determined in the detected period as the maximum actual current;

[0022] Compare the actual detected current with the minimum detected current determined in the detected period; if it is less, use the actual detected current as the minimum actual current; if it is greater, use the minimum detected current determined in the detected period as the minimum actual current.

[0023] Optionally, determining the bringing-in result of the slab head of the previous strip according to the current difference between the maximum actual current and the minimum actual current specifically includes:

[0024] Compare the current difference with a set current difference threshold;

[0025] If the current difference is greater than or equal to the set current difference threshold, determine that the slab head is brought into the F1 stand.

[0026] Optionally, if it is detected that the F1 stand is loaded for more than a first set time, within a set detection period, the method further includes:

[0027] Use a vision detection device to detect the actual strip width between the F1 stand and the F2 stand;

[0028] If the actual strip width is less than or equal to the set width threshold, determine that the slab head is brought into the F1 stand.

[0029] Optionally, triggering corresponding operations according to the bringing-in result of the slab head specifically includes:

[0030] If the rolling force difference is greater than or equal to the set rolling force difference threshold, or the current difference is greater than or equal to the set current difference threshold, or the actual strip width is less than or equal to the set width threshold, perform an alarm operation;

[0031] If the rolling force difference is greater than or equal to the set rolling force difference threshold, the current difference is greater than or equal to the set current difference threshold, and the actual strip width is less than or equal to the set width threshold, perform an alarm operation and prohibit the triggering of the quick stop operation;

[0032] If the rolling force difference is greater than or equal to the set rolling force difference threshold, the current difference is greater than or equal to the set current difference threshold, and the actual strip width is greater than the set width threshold, perform an alarm operation and simultaneously perform a quick stop operation.

[0033] In a second aspect of the present invention, a slab head detection system is disclosed. The system includes:

[0034] A detection unit, configured to, if it is detected that the F1 stand is loaded for more than a first set time, within a set detection period, compare the actual detected rolling force of the current cycle with the maximum detected rolling force and the minimum detected rolling force determined in the detected cycles respectively at a cycle until the maximum actual rolling force and the minimum actual rolling force within the set detection period are obtained; wherein, the initial value of the maximum detected rolling force is the lower limit value of the rolling force setting range, and the initial value of the minimum detected rolling force is the upper limit value of the rolling force setting range;

[0035] A determination unit, configured to determine the carrying-in result of the slab head of the previous strip according to the rolling force difference between the maximum actual rolling force and the minimum actual rolling force;

[0036] A trigger unit, configured to trigger corresponding operations according to the carrying-in result of the slab head.

[0037] Through one or more technical solutions of the present invention, the present invention has the following beneficial effects or advantages:

[0038] The present invention provides a slab head detection method and system. If it is detected that the F1 stand is loaded for more than a first set time, within a set detection period, compare the actual detected rolling force of the current cycle with the maximum detected rolling force and the minimum detected rolling force determined in the detected cycles respectively at a cycle until the maximum actual rolling force and the minimum actual rolling force within the set detection period are obtained. Determine the carrying-in result of the slab head of the previous strip according to the rolling force difference between the maximum actual rolling force and the minimum actual rolling force; trigger corresponding operations according to the carrying-in result of the slab head, such as alarm, quick stop and other operations, timely handle the accident of slab head carrying-in, avoid the expansion of the accident, and thus ensure the smooth progress of hot rolling.

[0039] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following specifically illustrates the specific embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0041] Figure 1The flowchart of a slab head detection method according to an embodiment of the present invention is shown;

[0042] Figure 2 The schematic diagram of a slab head detection system according to an embodiment of the present invention is shown. Detailed implementation manners

[0043] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.

[0044] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.

[0045] In a first aspect, as Figure 1 shown, a slab head detection method provided by an embodiment of the present invention at least includes the following steps:

[0046] S101, if it is detected that the F1 stand is loaded for more than a first set time, within a set detection period, the actual detection rolling force of the current cycle is compared with the maximum detection rolling force and the minimum detection rolling force determined in the detected cycles respectively at a cycle until the maximum actual rolling force and the minimum actual rolling force within the set detection period are obtained.

[0047] Wherein, the F1 stand being loaded means that the F1 stand undertakes the rolling load of the steel during the rolling process, that is, the rolls of the F1 stand apply forces such as pressure and friction to the passing billet or steel strip, causing the steel to undergo plastic deformation to meet the specified shape, size and performance requirements. When the F1 stand is loaded for more than the first set time, for example, 0.3 s, taking the moment exceeding the first set time as the starting moment, a set detection period is determined, for example, 5 s. The strip area corresponding to the set detection period of 5 s determined after the F1 stand is loaded for 0.3 s is used as the slab head to be brought into the detection area.

[0048] In the initial stage of detection, the initial values of the maximum detected rolling force and the minimum detected rolling force are determined based on the rolling force setting range. Among them, the rolling force setting range is [0 KN, 40000 KN]. Among them, the initial value of the maximum rolling force is the lower limit value of the rolling force setting range, which is: 0 KN, and the initial value of the minimum detected rolling force is the upper limit value of the rolling force setting range, which is: 40000 KN. The purpose of such a design is to facilitate accurately determining the maximum actual rolling force and the minimum actual rolling force within the set detection period. Specifically, before sampling, the initial value of the maximum detected rolling force is set as the lower limit value of the rolling force setting range, so that any detected rolling force obtained in the later detection is greater than the maximum detected rolling force, and thus the maximum actual rolling force can be accurately determined. Similarly, by setting the initial value of the minimum detected rolling force as the upper limit value of the rolling force setting range, any detected rolling force obtained in the later detection is smaller than the minimum detected rolling force, and thus the minimum actual rolling force can be accurately determined.

[0049] In this embodiment, every 30 ms is used as a detection cycle, which of course does not form a limitation. Within the set detection period, there are multiple detection cycles.

[0050] During the periodic detection process, for each detection cycle, the actual detected rolling force of the current cycle is compared with the maximum detected rolling force and the minimum detected rolling force determined in the detected cycles respectively. Specifically, the actual detected rolling force is compared with the maximum detected rolling force determined in the detected cycles on a periodic basis; if it is greater, the actual detected rolling force is taken as the maximum actual rolling force; if it is smaller, the maximum detected rolling force determined in the detected cycles is taken as the maximum actual rolling force. For example, in the first detection cycle, the actual detected rolling force (such as 10000 KN) is compared with the initial value of the maximum detected rolling force, 0 KN, and 10000 KN > 0 KN, so 10000 KN is taken as the maximum actual rolling force. In the second detection cycle, the actual detected rolling force (such as 15000 KN) is compared with the maximum actual rolling force (such as 10000 KN) in the detected cycles, and 15000 KN > 10000 KN, so 15000 KN is taken as the maximum actual rolling force. And so on, the maximum rolling force within the set detection period is obtained.

[0051] Further, compare the actually detected rolling force with the minimum detected rolling force determined in the detected period; if it is less, use the actually detected rolling force as the minimum actual rolling force; if it is greater, use the minimum detected rolling force determined in the detected period as the minimum actual rolling force. For example, in the first detected period, compare the actually detected rolling force (e.g., 10000 KN) with the initial value of the minimum detected rolling force, 40000 KN. Since 10000 KN < 40000 KN, use 10000 KN as the minimum actual rolling force. In the second detected period, compare the actually detected rolling force (e.g., 15000 KN) with the minimum actual rolling force in the detected period (e.g., 10000 KN). Since 15000 KN > 10000 KN, still use 10000 KN as the minimum actual rolling force. And so on, to obtain the minimum rolling force within the set detection period.

[0052] S102. Determine the bringing-in result of the slab head of the previous strip steel according to the rolling force difference between the maximum actual rolling force and the minimum actual rolling force.

[0053] In the specific implementation process, subtract the minimum actual rolling force from the maximum actual rolling force to obtain the rolling force difference. Compare the rolling force difference with the set rolling force difference threshold, e.g., 10000 KN; if the rolling force difference is greater than or equal to the set rolling force difference threshold, determine that the slab head of the previous strip steel is brought into the F1 stand. For example, within the set detection period, the minimum actual rolling force of 3203 KN and the maximum actual rolling force of 23384 KN are collected, and the deviation between the two exceeds 10000 KN, then it is determined that the rolling force detection is abnormal, indicating that the slab head of the previous strip steel is brought into the F1 stand.

[0054] The above is an embodiment of judging whether the slab head is brought into the F1 stand according to the rolling force. In an alternative implementation, considering that the load of the F1 stand becomes larger after the slab head is brought into the tandem rolling, the mill current will increase accordingly. If it is pushed in horizontally, due to the smaller slab head, the load of the F1 stand will be smaller than that in the normal section, and the mill current will decrease accordingly. Then use the magnitude of the mill current as the judgment mechanism for whether the slab head is brought into the F1 stand.

[0055] In the specific implementation process, if it is detected that the F1 stand is loaded for more than the first set time, within the set detection period, compare the actual detected current in the current period with the maximum detected current and the minimum detected current determined in the detected period respectively according to the cycle until the maximum actual current and the minimum actual current within the set detection period are obtained.

[0056] Among them, the current setting range is [0, 200%], the initial value of the maximum detected current is the lower limit value 0 of the current setting range, and the initial value of the minimum detected current is the upper limit value 200% of the current setting range.

[0057] During the periodic detection process, for each detection cycle within the set detection period, the actual detected current is compared with the maximum detected current determined in the detected cycles on a periodic basis; if it is greater, the actual detected current is taken as the maximum actual current; if it is less, the maximum detected current determined in the detected cycles is taken as the maximum actual current. Similarly, the actual detected current is compared with the minimum detected current determined in the detected cycles; if it is less, the actual detected current is taken as the minimum actual current; if it is greater, the minimum detected current determined in the detected cycles is taken as the minimum actual current.

[0058] Furthermore, the entry result of the slab head of the previous strip is determined according to the current difference between the maximum actual current and the minimum actual current. Specifically, the maximum actual current and the minimum actual current are subtracted to obtain the current difference. The current difference is compared with the set current difference threshold; if the current difference is greater than or equal to the set current difference threshold, it is determined that the slab head enters the F1 stand. For example, when the difference between the maximum actual current and the minimum actual current reaches 50%, it is considered that the slab head of the previous strip is brought in.

[0059] In an alternative embodiment, a visual detection device can also be used to detect the slab. Specifically, if it is detected that the F1 stand is loaded for more than the first set time, within the set detection period, the actual strip width between the F1 stand and the F2 stand is detected by the visual detection device; if the actual strip width is less than or equal to the set width threshold, it is determined that the slab head enters the F1 stand. For example, when the actual width is less than 50% of the set strip width, it is considered that the slab head is brought in, and it can be determined that the slab head is horizontally pushed into by the strip rather than entering in a double-layer manner by falling onto the strip.

[0060] The above are several detection methods for the entry of the slab head. The above several detection methods can be used alone or in combination.

[0061] S103, trigger the corresponding operation according to the entry result of the slab head.

[0062] During the process of triggering the corresponding operation, if the rolling force difference is greater than or equal to the set rolling force difference threshold, or the current difference is greater than or equal to the set current difference threshold, or the actual strip width is less than or equal to the set width threshold, the entry result that the slab head enters the F1 stand can be obtained, then the alarm operation is triggered.

[0063] If the rolling force difference is greater than or equal to the set rolling force difference threshold, the current difference is greater than or equal to the set current difference threshold, and the actual strip width is less than or equal to the set width threshold, indicating that the slab head enters the F1 stand and is in a horizontally pushed-in situation, then the alarm operation is executed and the triggering of the quick stop operation is prohibited;

[0064] If the rolling force difference is greater than or equal to the set rolling force difference threshold, the current difference is greater than or equal to the set current difference threshold, and the actual strip width is greater than the set width threshold, indicating that the slab head enters the F1 stand and is the result of double-layer entry, then an alarm operation is performed and a quick stop operation is simultaneously performed.

[0065] In this technical solution, by adding a diagnostic mechanism for the slab head being brought into the rolling mill, if it is detected that the F1 stand is loaded for more than the first set time, within the set detection period, the actual detected rolling force in the current cycle is compared with the maximum detected rolling force and the minimum detected rolling force determined in the detected cycles respectively at a cycle until the maximum actual rolling force and the minimum actual rolling force within the set detection period are obtained. According to the rolling force difference between the maximum actual rolling force and the minimum actual rolling force, the entry result of the slab head of the previous strip is determined. After diagnosing that the slab head enters the rolling mill, corresponding operations are performed, such as alarm, quick stop and other operations, to timely handle the accident of the slab head entering and avoid the expansion of the accident, thus ensuring the smooth progress of hot rolling.

[0066] Furthermore, after diagnosing that the slab head enters the rolling mill, quickly judge the cause of the fault and perform different countermeasures according to the situation of the slab head entering, so as to specifically handle the accident of the slab head entering.

[0067] In a second aspect, based on the same inventive concept as the slab head detection method provided in the foregoing first aspect embodiment, the embodiment of the present invention also provides a slab head detection system. See Figure 2 , the system includes:

[0068] A detection unit 201, configured to, if it is detected that the F1 stand is loaded for more than the first set time, within the set detection period, compare the actual detected rolling force in the current cycle with the maximum detected rolling force and the minimum detected rolling force determined in the detected cycles respectively at a cycle until the maximum actual rolling force and the minimum actual rolling force within the set detection period are obtained; wherein, the initial value of the maximum detected rolling force is the lower limit value of the rolling force setting range, and the initial value of the minimum detected rolling force is the upper limit value of the rolling force setting range;

[0069] A determination unit 202, configured to determine the entry result of the slab head of the previous strip according to the rolling force difference between the maximum actual rolling force and the minimum actual rolling force;

[0070] A trigger unit 203, configured to trigger corresponding operations according to the entry result of the slab head.

[0071] It should be noted that for the slab head detection system provided in the embodiments of the present invention, the specific manners in which each module performs operations have been described in detail in the method embodiments provided in the above first aspect. The specific implementation process may refer to the method embodiments provided in the above first aspect, and will not be elaborated herein.

[0072] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages:

[0073] The present invention provides a slab head detection method and system. If it is detected that the load of the F1 stand exceeds the first set time, within the set detection period, the actual detection rolling force of the current cycle is compared with the maximum detection rolling force and the minimum detection rolling force determined in the detected cycles respectively in a cycle until the maximum actual rolling force and the minimum actual rolling force within the set detection period are obtained. The bringing-in result of the slab head of the previous strip is determined according to the rolling force difference between the maximum actual rolling force and the minimum actual rolling force; corresponding operations are triggered according to the bringing-in result of the slab head, such as alarm, quick stop and other operations, to timely handle the accident of the slab head being brought in, avoid the expansion of the accident, and thus ensure the smooth progress of hot rolling.

[0074] Although the preferred embodiments of the present application have been described, those of ordinary skill in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0075] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

1. A slab head detection method, characterized in that, The method includes: If it is detected that the F1 stand is loaded for more than the first set time, within the set detection period, the actual detected rolling force of the current period is compared with the maximum detected rolling force and the minimum detected rolling force determined in the detected periods in a cycle until the maximum actual rolling force and the minimum actual rolling force within the set detection period are obtained; wherein, the initial value of the maximum detected rolling force is the lower limit value of the rolling force setting range, and the initial value of the minimum detected rolling force is the upper limit value of the rolling force setting range; Determine the bringing-in result of the slab head of the previous strip according to the rolling force difference between the maximum actual rolling force and the minimum actual rolling force; Trigger corresponding operations according to the bringing-in result of the slab head.

2. The method according to claim 1, wherein If it is detected that the F1 stand is loaded for more than the first set time, the method further includes: Taking the moment when the first set time is exceeded as the starting moment, determine the set detection period.

3. The method according to claim 1, characterized in that, The step of comparing the actual detected rolling force of the current period with the maximum detected rolling force and the minimum detected rolling force determined in the detected periods in a cycle until the maximum actual rolling force and the minimum actual rolling force within the set detection period are obtained specifically includes: Compare the actual detected rolling force with the maximum detected rolling force determined in the detected periods in a cycle; if it is greater than, then take the actual detected rolling force as the maximum actual rolling force; if it is less than, then take the maximum detected rolling force determined in the detected periods as the maximum actual rolling force; Compare the actual detected rolling force with the minimum detected rolling force determined in the detected periods; if it is less than, then take the actual detected rolling force as the minimum actual rolling force; if it is greater than, then take the minimum detected rolling force determined in the detected periods as the minimum actual rolling force.

4. The method according to claim 1, wherein The step of determining the bringing-in result of the slab head according to the rolling force difference between the maximum actual rolling force and the minimum actual rolling force specifically includes: Compare the rolling force difference with the set rolling force difference threshold; If the rolling force difference is greater than or equal to the set rolling force difference threshold, it is determined that the slab head is brought into the F1 stand.

5. The method according to claim 4, characterized in that, If it is detected that the F1 stand is loaded for more than the first set time, within the set detection period, the method further includes: Compare the actual detected current of the current period with the maximum detected current and the minimum detected current determined in the detected periods in a cycle until the maximum actual current and the minimum actual current within the set detection period are obtained; wherein, the initial value of the maximum detected current is the lower limit value of the current setting range, and the initial value of the minimum detected current is the upper limit value of the current setting range; Determine the bringing-in result of the slab head of the previous strip according to the current difference between the maximum actual current and the minimum actual current.

6. The method according to claim 5, characterized in that, The step of comparing the actual detected current of the current period with the maximum detected current and the minimum detected current determined in the detected periods in a cycle until the maximum actual current and the minimum actual current within the set detection period are obtained specifically includes: Compare the actual detected current with the maximum detected current determined in the detected period at regular intervals; if it is greater, then use the actual detected current as the maximum actual current; if it is less, then use the maximum detected current determined in the detected period as the maximum actual current; Compare the actual detected current with the minimum detected current determined in the detected period; if it is less, then use the actual detected current as the minimum actual current; if it is greater, then use the minimum detected current determined in the detected period as the minimum actual current.

7. The method according to claim 5, characterized in that, Determine the bringing-in result of the slab head of the previous strip according to the current difference between the maximum actual current and the minimum actual current, specifically including: Compare the current difference with a set current difference threshold; If the current difference is greater than or equal to the set current difference threshold, determine that the slab head is brought into the F1 stand.

8. The method according to claim 7, wherein If it is detected that the F1 stand is loaded for more than the first set time, within the set detection period, the method further includes: Use a vision detection device to detect the actual strip width between the F1 stand and the F2 stand; If the actual strip width is less than or equal to the set width threshold, determine that the slab head is brought into the F1 stand.

9. The method according to claim 8, characterized in that, Trigger corresponding operations according to the bringing-in result of the slab head, specifically including: If the rolling force difference is greater than or equal to the set rolling force difference threshold, or the current difference is greater than or equal to the set current difference threshold, or the actual strip width is less than or equal to the set width threshold, perform an alarm operation; If the rolling force difference is greater than or equal to the set rolling force difference threshold, the current difference is greater than or equal to the set current difference threshold, and the actual strip width is less than or equal to the set width threshold, perform an alarm operation and prohibit the triggering of the quick stop operation; If the rolling force difference is greater than or equal to the set rolling force difference threshold, the current difference is greater than or equal to the set current difference threshold, and the actual strip width is greater than the set width threshold, perform an alarm operation and at the same time perform a quick stop operation.

10. A slab head detection system, characterized in that, The system includes: A detection unit, which is used to, if it is detected that the F1 stand is loaded for more than the first set time, within the set detection period, compare the actual detected rolling force of the current period with the maximum detected rolling force and the minimum detected rolling force determined in the detected period at regular intervals until the maximum actual rolling force and the minimum actual rolling force within the set detection period are obtained; wherein, the initial value of the maximum detected rolling force is the lower limit value of the rolling force setting range, and the initial value of the minimum detected rolling force is the upper limit value of the rolling force setting range; A determination unit, which is used to determine the bringing-in result of the slab head of the previous strip according to the rolling force difference between the maximum actual rolling force and the minimum actual rolling force; A trigger unit, which is used to trigger corresponding operations according to the bringing-in result of the slab head.

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