Slitting method, device and strip cold rolling system

Abstract

The application provides a strip steel slitting method and device and a strip steel cold rolling system, and relates to the technical field of strip steel production. After the strip steel is rolled by the roll gap of any one stand of a rolling mill, the thickness of the strip steel becomes thinner, and the length of the strip steel becomes longer. The more times a segment of the strip steel passes through the roll gap of the stand during movement, the greater the elongation length of the segment of the strip steel. According to the initial thickness of the strip steel before being rolled by the first stand, the target thickness of the strip steel after being rolled by the last stand in the moving direction, the pre-recorded distance between two adjacent stands, the number of stands, the relative reduction of each stand, the distance between the last stand in the moving direction and the slitting device, and the set correction factor, the to-be-slitted length of the strip steel after being rolled by the multiple stands between the first stand in the moving direction and the slitting device is determined, and the accuracy of the to-be-slitted length is high. In this way, the strip steel with an unqualified thickness can be accurately slit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of strip steel production, and particularly relates to a slitting method and device of strip steel and a strip steel cold rolling system. BACKGROUND

[0002] The strip steel cold rolling is a steel processing technology, which is to roll the hot-rolled strip steel at room temperature by cold extrusion to obtain the strip steel with a required thickness. The main process flow of the strip steel cold rolling technology includes the steps of pickling, rolling, annealing, flattening, coating and shearing.

[0003] Generally, the rolling mill includes a plurality of machine frames arranged at intervals, the roll gap of each machine frame is used for rolling the strip steel, and the coiler is used for coiling the strip steel so that the strip steel moves between the roll gaps of the plurality of machine frames. In the rolling step, the strip steel cold rolling system needs to be stopped due to factors such as tool switching, equipment shutdown and quality confirmation. In the case of shutdown, there is continuous stamping on the strip steel between the roll gaps of the machine frames of the rolling mill, which causes deformation of the surface of the strip steel and makes the thickness unqualified. Therefore, the unqualified strip steel section needs to be cut off. At present, the unqualified thickness strip steel section is mainly observed by manual observation, which is not accurate in determining the unqualified thickness strip steel section, and the cutting of the unqualified strip steel section is also not accurate. SUMMARY

[0004] The present application provides a slitting method and device of strip steel and a strip steel cold rolling system to solve the problems in the prior art.

[0005] In a first aspect, the present application provides a slitting method of strip steel, which is applied to a strip steel cold rolling system, the strip steel cold rolling system includes a rolling mill, a coiler, a slitting device and a main controller, the rolling mill includes a plurality of machine frames arranged at intervals, the roll gap of each machine frame is used for rolling the strip steel, and the coiler is used for coiling the strip steel so that the strip steel moves between the roll gaps of the plurality of machine frames, and the method provided by the present application includes:

[0006] The main controller acquires the initial thickness of the strip steel before being rolled by the first machine frame in the moving direction and the target thickness of the strip steel after being rolled by the last machine frame in the moving direction in the case of determining that the rolling mill is stopped;

[0007] The main controller determines the to-be-slitted length of the strip steel rolled by the plurality of machine frames between the first machine frame in the moving direction and the slitting device according to the initial thickness, the target thickness, the pre-recorded distance between the adjacent two machine frames, the number of machine frames, the relative reduction rate of each machine frame, the distance between the last machine frame in the moving direction and the slitting device and the set correction factor;

[0008] The main controller acquires the length of the strip steel coiled by the coiler in the case of determining that the rolling mill is restarted;

[0009] The main controller controls the slitting device to slit the strip steel when the length of the strip steel wound by the coiler reaches the to-be-slitted length.

[0010] In some embodiments, the main controller determines the to-be-slitted length of the strip steel rolled by the plurality of stands between the first stand in the moving direction and the slitting device according to the initial thickness, the target thickness, a pre-recorded distance between two adjacent stands, a number of the stands, a relative reduction ratio of each stand, a distance between the last stand in the moving direction and the slitting device, and a set correction factor, including:

[0011] According to the formula The to-be-slitted length of the strip steel rolled by the plurality of stands between the first stand in the moving direction and the slitting device, wherein S is the to-be-slitted length, ε1 is the relative reduction ratio of the first stand in the moving direction, ε2 is the relative reduction ratio of the second stand in the moving direction, ε3 is the relative reduction ratio of the third stand in the moving direction, εn is the relative reduction ratio of the nth stand in the moving direction, a is the distance between two adjacent stands; H is the initial thickness, h is the target thickness, b is the distance between the last stand in the moving direction and the slitting device, and k is the set correction factor. n

[0012] In some embodiments, the set correction factor k satisfies -0.3(n-1)×a≤k≤0.3(n-1)×a.

[0013] In some embodiments, the main controller controls the slitting device to slit the strip steel when the length of the strip steel wound by the coiler reaches the to-be-slitted length, including:

[0014] The main controller sends a slitting preparation instruction to the slitting device to control the slitting device to perform a slitting preparation operation when the length of the strip steel wound by the coiler reaches the set instruction issuance length.

[0015] The main controller controls the slitting device that has completed the slitting preparation to slit the strip steel when the length of the strip steel wound by the coiler reaches the to-be-slitted length.

[0016] In some embodiments, the instruction issuance length satisfies Wherein L is the instruction issuance length, and S is the to-be-slitted length.

[0017] In some embodiments, the initial thickness and the target thickness are preconfigured or received from a terminal device.

[0018] ​In a second aspect, the present application also provides a slitting device of a strip steel, configured to a main controller of a strip steel cold rolling system, the strip steel cold rolling system further comprising a rolling mill, a coiler and a slitting device, the rolling mill comprising a plurality of racks arranged at intervals, a roll gap of each rack being configured to roll the strip steel, and the coiler being configured to coil the strip steel so that the strip steel moves between the roll gaps of the plurality of racks. The device provided by the present application comprises:

[0019] a data acquisition unit configured to acquire an initial thickness of the strip steel before being rolled by a first rack in a moving direction and a target thickness of the strip steel after being rolled by a last rack in the moving direction, in a case where the rolling mill is determined to be stopped;

[0020] a to-be-slitted length determination unit configured to determine a to-be-slitted length of the strip steel after being rolled by the plurality of racks between the first rack and the slitting device in the moving direction, according to the initial thickness, the target thickness, a pre-recorded distance between two adjacent racks, a number of the racks, a relative reduction rate of each rack, a distance between the last rack in the moving direction and the slitting device, and a set correction factor;

[0021] a coiled length acquisition unit configured to acquire a length of the strip steel coiled by the coiler, in a case where the rolling mill is determined to be restarted;

[0022] a strip steel slitting unit configured to control the slitting device to slit the strip steel, in a case where the length of the strip steel coiled by the coiler reaches the to-be-slitted length.

[0023] In a third aspect, the present application also provides a strip steel cold rolling system, comprising a rolling mill, a coiler, a slitting device and a main controller, the rolling mill comprising a plurality of racks arranged at intervals, a roll gap of each rack being configured to roll the strip steel, the coiler being configured to coil the strip steel so that the strip steel moves between the roll gaps of the plurality of racks, and the main controller being configured to execute the method provided by the first aspect of the present application.

[0024] In a fourth aspect, the present application also provides a storage medium, the storage medium storing a computer program, the computer program being configured to cause the strip steel cold rolling system to execute the method executed by the main controller provided by the first aspect of the present application.

[0025] In a fifth aspect, the present application also provides a computer program product, the computer program product comprising a computer program, the computer program being configured to cause the strip steel cold rolling system to execute the method executed by the main controller provided by the first aspect of the present application, when the computer program is executed.

[0026] This application provides a strip slitting method, apparatus, and cold rolling system. Understandably, after being rolled at the roll gap of any stand in a rolling mill, the strip thickness decreases while its length increases. The more times a segment of strip passes through the roll gap during its movement, the greater its elongation. Therefore, the main controller can determine the slitting length of the strip after being rolled by multiple stands between the first stand and the slitting equipment in the moving direction, based on the initial thickness of the strip before being rolled by the first stand, the target thickness of the strip after being rolled by the last stand in the moving direction, the pre-recorded distance between two adjacent stands, the number of stands, the relative reduction rate of each stand, the distance between the last stand and the slitting equipment in the moving direction, and a set correction factor. This results in high accuracy in determining the slitting length. Once the rolling mill is restarted, the length of the strip coiled by the coiler is obtained. If the length of the strip coiled by the coiler reaches the required slitting length, the slitting equipment is controlled to slit the strip. In this way, strips with unacceptable thickness can be accurately slit. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the strip cutting system provided in the embodiments of this application;

[0029] Figure 2 A flowchart illustrating the strip cutting method provided in this application embodiment;

[0030] Figure 3 This is a functional block diagram of the strip cutting device provided in the embodiments of this application. Detailed Implementation

[0031] Embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0032] The accompanying drawings illustrate various structural schematics according to embodiments of the present disclosure. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0033] In the context of this disclosure, when a layer / element is referred to as being "above" another layer / element, the layer / element may be directly above the other layer / element, or there may be an intermediate layer / element between them. Additionally, if a layer / element is "above" another layer / element in one orientation, then when the orientation is reversed, the layer / element may be "below" the other layer / element.

[0034] The technical solutions of this application and how they solve the aforementioned technical problems will be described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0035] This application provides a method for slitting steel strip, applied to a cold rolling system for steel strip. For example... Figure 1 As shown, the strip cold rolling system includes a rolling mill, a coiler 104, a slitting device 103, and a main controller (not shown in the figures). The rolling mill includes multiple spaced stands 102, each stand 102 having a roll gap for rolling strip 101. The coiler 104 is used to coil the strip 101, allowing the strip 101 to move between the roll gaps of the multiple stands 102. Figure 2 As shown, the method provided in this application embodiment includes:

[0036] S201: When the main controller determines that the rolling mill is stopped, it obtains the initial thickness of the strip 101 in the moving direction before it is rolled by the first stand 102 and the target thickness of the strip 101 in the moving direction after it is rolled by the last stand 102.

[0037] For example, the initial thickness and target thickness are pre-configured or received from the terminal device.

[0038] S202: The main controller determines the length of the strip 101 to be slit after being rolled by multiple stands 102, based on the initial thickness, target thickness, pre-recorded distance between two adjacent stands 102, number of stands 102, relative reduction rate of each stand 102, distance between the last stand 102 of the strip 101 in the moving direction and the slitting device 103, and the set correction factor.

[0039] Specifically, it can be based on the formula.

[0040] The length of the strip 101 to be slit after being rolled by multiple stands 102 is determined between the first stand 102 and the slitting device 103 in the moving direction. Where S is the length to be slit, ε1 is the relative reduction rate of the strip 101 in the first stand 102 in the moving direction, ε2 is the relative reduction rate of the strip 101 in the second stand 102 in the moving direction, ε3 is the relative reduction rate of the strip 101 in the third stand 102 in the moving direction, and ε... n Let be the relative reduction rate of the strip 101 on the nth stand 102 in the moving direction, 'a' be the distance between two adjacent stands 102, 'H' be the initial thickness, 'h' be the target thickness, 'b' be the distance between the last stand 102 of the strip 101 in the moving direction and the slitting equipment 103, and 'k' be a set correction factor. Understandably, the relative reduction rate of the stands 102, the distance between two adjacent stands 102, and the elongation length of the strip 101 are all related.

[0041] It should be noted that, as before Figure 1 As shown, the strip cold rolling system includes n stands 102. The n stands 102 are sequentially named stand 1, stand 2, stand 3, stand 4, ..., and stand n in the direction of strip 101 movement. It can be understood that the strip 101 segment between stand 1 and stand 2 is rolled n-1 times, the strip 101 segment between stand 2 and stand 3 is rolled n-2 times, ..., and the strip 101 segment between stand n-1 and stand n is rolled n times. Therefore, the thickness h1 of the strip 101 segment between stand 1 and stand 2 (i.e., the strip 101 after being rolled by stand 1) is h1 = H × (1 - ε1). It can be understood that since the change in thickness and width of strip 101 before and after rolling is small and can be ignored, based on the principle that the volume of strip 101 remains unchanged before and after rolling, we can obtain h1 × a = h × L. 1-2 , can be obtained Among them, L 1-2 This refers to the length of the strip 101 between frame 1 and frame 2 after it has been rolled by frame 1; similarly, we can obtain... Among them, L 2-3h1 is the length of the strip 101 section between frame 2 and frame 3 after being rolled by frame 2, and h2 is the thickness of the strip 101 after being rolled by frame 2. Among them, L 3-4 h3 is the length of the strip 101 section between stands 3 and 4 after being rolled by stand 3, and h3 is the thickness of the strip 101 after being rolled by stand 3. Among them, L (n-1)-n h is the length of the strip 101 section between stand n-1 and stand n after it has been rolled by stand n-1. n-1 Let S be the thickness of the strip 101 after being rolled by stand n-1. Since S = L 1-2 +L 2-3 +L 3-4 +…+L (n-1)-n +b+k, therefore we can obtain the formula

[0042] Optionally, in some implementations, the set correction factor k satisfies -0.3(n-1)×a≤k≤0.3(n-1)×a, which can make the reliability of the final obtained length to be cut higher.

[0043] S203: When the main controller determines that the rolling mill has been restarted, it obtains the length of the strip 101 coiled by the coiler 104.

[0044] S204: When the main controller determines that the length of the strip 101 wound by the coiler 104 has reached the length to be cut, it controls the slitting device 103 to cut the strip 101.

[0045] Specifically, S204 can be implemented as follows: when the main controller determines that the length of the strip 101 wound by the coiler 104 has reached the set instruction issuance length, it sends a preparation slitting instruction to the slitting device 103 to control the slitting device 103 to perform the slitting preparation operation; when the main controller determines that the length of the strip 101 wound by the coiler 104 has reached the length to be slitted, it controls the slitting device 103, which is ready for slitting, to slit the strip 101. In some embodiments, the instruction issuance length meets the... Where L is the command issuance length and S is the length to be cut. In this way, the cutting equipment 103 can complete the cutting preparation work in advance (such as initialization and power-on), so as to ensure that the strip steel 101 can be accurately cut according to the length to be cut.

[0046] Through the inventor's experiments, the thickness H of the strip 101 before entering the first rack 102 was 2.87 mm, and the thickness h of the strip 101 outputting to the last rack 102 was 0.595 mm; the number of racks 102 was n = 5, the distance between two adjacent racks 102 was a = 6 m, and the distance b from the last rack 102 to the slitting equipment 103 was 3 m; the relative reduction rates of the five racks 102 were ε1 = 0.35541, ε2 = 0.37622, ​​ε3 = 0.3344, ε4 = 0.22984, and ε5 = 0.05, respectively. Therefore, according to the formula...

[0047]

[0048] We can obtain S = 57.215m, where -0.3×4×6m ≤ k ≤ 0.3×4×6m, that is, -7.2m ≤ k ≤ 7.2m. In this embodiment, we select k = 1. When the instruction length L satisfies 0m ≤ L ≤ 19.072m, we select L = 10m to prepare the slitting instruction. When S = 57.215m, we control the slitting equipment 103, which is ready for slitting, to slitting the strip steel 101. The accuracy of slitting the strip steel 101 is high.

[0049] In summary, this application provides a strip steel slitting method. Since the strip steel 101 becomes thinner and longer after being rolled by the roll gap of any stand 102 of the rolling mill, the more times a segment of strip steel 101 is rolled by the roll gap of the stand 102 during its movement, the greater the extension length of that segment. Therefore, the main controller can determine the slitting length of the strip steel 101 after being rolled by multiple stands 102 in the moving direction, based on the initial thickness of the strip steel 101 before being rolled by the first stand 102, the target thickness of the strip steel 101 after being rolled by the last stand 102 in the moving direction, the pre-recorded distance between two adjacent stands 102, the number of stands 102, the relative reduction rate of each stand 102, the distance between the last stand 102 and the slitting device 103 in the moving direction, and a set correction factor. In this way, the accuracy of the determined slitting length is high. After confirming the mill has restarted, the length of the strip 101 coiled by the coiler 104 is obtained; once the length of the strip 101 coiled by the coiler 104 is determined to be the slitting length, the slitting equipment 103 is controlled to slit the strip 101. In this way, strips 101 with unacceptable thickness can be accurately slit.

[0050] Additionally, this application embodiment also provides a strip slitting device, configured in the main controller of the strip cold rolling system (not shown in the accompanying drawings). Still as Figure 1As shown, the strip cold rolling system also includes a rolling mill, a coiler 104, and a slitting device 103. The rolling mill includes multiple spaced stands 102, each stand 102 having a roll gap for rolling the strip 101. The coiler 104 is used to coil the strip 101, allowing the strip 101 to move between the roll gaps of the multiple stands 102. It should be noted that the strip slitting device provided in this embodiment has the same basic principle and technical effects as the above embodiments. For the sake of brevity, any parts not mentioned in this embodiment can be referred to the corresponding content in the above embodiments. Figure 3 As shown, the apparatus provided in this application embodiment includes a data acquisition unit, a length to be cut determination unit, a winding length acquisition unit, and a strip cutting unit. Among them,

[0051] The data acquisition unit is used to acquire the initial thickness of the strip 101 in the moving direction before it is rolled by the first stand 102 and the target thickness of the strip 101 in the moving direction after it is rolled by the last stand 102, when it is determined that the rolling mill is stopped.

[0052] The unit for determining the length to be slit is used to determine the length to be slit after the strip 101 between the first frame 102 and the slit device 103 in the moving direction has been rolled by multiple frames 102, based on the initial thickness, target thickness, pre-recorded distance between two adjacent frames 102, number of frames 102, relative reduction rate of each frame 102, distance between the last frame 102 of the strip 101 in the moving direction and the slit device 103, and a set correction factor.

[0053] The coiling length acquisition unit is used to acquire the length of the strip 101 coiled by the coiler 104 when it is determined that the rolling mill has been restarted.

[0054] The strip slitting unit is used to control the slitting equipment 103 to slit the strip 101 when the length of the strip 101 wound by the coiler 104 is determined to be the length to be slitted.

[0055] In some implementations, the unit for determining the length to be cut is specifically used to determine the length according to a formula. The strip 101 between the first stand 102 and the slitting device 103 in the moving direction is the length to be slit after being rolled by multiple stands 102, where S is the length to be slit, ε1 is the relative reduction rate of the strip 101 in the first stand 102 in the moving direction, ε2 is the relative reduction rate of the strip 101 in the second stand 102 in the moving direction, ε3 is the relative reduction rate of the strip 101 in the third stand 102 in the moving direction, and ε nLet be the relative reduction rate of the strip 101 on the nth stand 102 in the moving direction, 'a' be the distance between two adjacent stands 102, 'H' be the initial thickness, 'h' be the target thickness, 'b' be the distance between the last stand 102 of the strip 101 in the moving direction and the slitting device 103, and 'k' be a set correction factor. Optionally, the set correction factor k satisfies -0.3(n-1)×a≤k≤0.3(n-1)×a.

[0056] In some embodiments, the strip slitting unit is specifically used to send a slitting preparation command to the slitting device 103 when it is determined that the length of the strip 101 wound by the coiler 104 has reached the set command issuance length, so as to control the slitting device 103 to perform the slitting preparation operation; when it is determined that the length of the strip 101 wound by the coiler 104 has reached the length to be slitting, it controls the slitting device 103, which has been prepared for slitting, to slitting the strip 101.

[0057] In some implementations, the instruction issuance length meets the following requirements. Where L is the instruction length and S is the length to be cut.

[0058] In addition, this application also provides a strip cold rolling system, including a rolling mill, a coiler, a slitting device and a main controller. The rolling mill includes multiple spaced stands, and the roll gap of each stand is used to roll strip steel. The coiler is used to coil the strip steel so that the strip steel moves between the roll gaps of the multiple stands. The main controller is used to execute the method provided in the above embodiments of this application.

[0059] In addition, this application embodiment also provides a storage medium storing a computer program, which, when executed, causes the strip cold rolling system to perform the method executed by the main controller provided in the above embodiments of this application.

[0060] In addition, this application also provides a computer program product, including a computer program that, when run, causes the strip cold rolling system to perform the method executed by the main controller provided in the above embodiments of this application.

[0061] The above description does not provide detailed technical specifications regarding the structure of each layer. However, those skilled in the art should understand that layers and regions of desired shapes can be formed using various technical means. Furthermore, to form the same structure, those skilled in the art can also design methods that are not entirely identical to those described above. Additionally, although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be advantageously combined.

[0062] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0063] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for slitting steel strips, characterized in that, An application is made in a strip cold rolling system, the strip cold rolling system including a rolling mill, a coiler, a slitting device, and a main controller. The rolling mill includes multiple spaced stands, each stand having a roll gap for rolling strip steel. The coiler is used to coil the strip steel so that the strip steel moves between the roll gaps of the multiple stands. The method includes: When the main controller determines that the rolling mill has stopped, it acquires the initial thickness of the strip in the moving direction before it is rolled by the first stand and the target thickness of the strip in the moving direction after it is rolled by the last stand. The main controller determines the strip length to be slit after being rolled by multiple stands, based on the initial thickness, the target thickness, the pre-recorded distance between two adjacent stands, the number of stands, the relative reduction rate of each stand, the distance between the last stand of the strip in the moving direction and the slitting device, and a set correction factor. When the main controller determines that the rolling mill has been restarted, it obtains the length of the strip coiled by the coiler. When the main controller determines that the length of the strip wound by the coiler has reached the length to be cut, it controls the slitting device to cut the strip.

2. The method according to claim 1, characterized in that, The main controller determines the strip length to be slit after being rolled by multiple stands between the first stand and the slitting device in the moving direction, based on the initial thickness, the target thickness, the pre-recorded distance between two adjacent stands, the number of stands, the relative reduction rate of each stand, the distance between the last stand of the strip in the moving direction and the slitting device, and a set correction factor. This includes: According to the formula The length to be slit after the strip has been rolled by multiple stands in the moving direction is determined, where S is the length to be slit. The relative reduction rate of the strip in the first frame in the moving direction, The relative reduction rate of the strip in the second frame in the direction of movement. The relative reduction rate of the strip in the third frame in the direction of movement. The relative reduction rate of the strip on the nth stand in the moving direction is given by , where a is the distance between two adjacent stands; H is the initial thickness, h is the target thickness, b is the distance between the last stand of the strip in the moving direction and the slitting equipment, and k is the set correction factor.

3. The method according to claim 2, characterized in that, The set correction factor k satisfies .

4. The method according to claim 1, characterized in that, When the main controller determines that the length of the strip wound by the coiler has reached the required slitting length, it controls the slitting device to slit the strip, including: When the main controller determines that the length of the strip wound by the coiler has reached the set instruction issuance length, it sends a preparation slitting instruction to the slitting equipment to control the slitting equipment to perform the slitting preparation operation. When the main controller determines that the length of the strip wound by the coiler has reached the required length for slitting, it controls the slitting equipment, which is ready for slitting, to slit the strip.

5. The method according to claim 4, characterized in that, The instruction issuance length meets the requirements. Where L is the length of the instruction issued, and S is the length to be cut.

6. The method according to claim 1, characterized in that, The initial thickness and the target thickness are either pre-configured or received from the terminal device.

7. A strip steel slitting device, characterized in that, A main controller is configured in a strip cold rolling system, which also includes a rolling mill, a coiler, and a slitting device. The rolling mill includes multiple spaced stands, each stand's roll gap for rolling strip steel. The coiler is used to coil the strip steel so that it moves between the roll gaps of the multiple stands. The device includes: The data acquisition unit is used to acquire, in the case that the mill is stopped, the initial thickness of the strip in the moving direction before being rolled by the first stand and the target thickness of the strip in the moving direction after being rolled by the last stand. The unit for determining the length to be slit is used to determine the length to be slit after the strip between the first stand and the slit device in the moving direction has been rolled by multiple stands, based on the initial thickness, the target thickness, the pre-recorded distance between two adjacent stands, the number of stands, the relative reduction rate of each stand, the distance between the last stand of the strip in the moving direction and the slit device, and a set correction factor. The coiling length acquisition unit is used to acquire the length of the strip coiled by the coiler when it is determined that the rolling mill has been restarted. The strip slitting unit is used to control the slitting equipment to slit the strip when the length of the strip wound by the coiler is determined to be the length to be slitted.

8. A cold rolling system for strip steel, characterized in that, The device includes a rolling mill, a coiler, a slitting device, and a main controller. The rolling mill includes multiple spaced stands, each stand having a roll gap for rolling strip steel. The coiler is used to coil the strip steel so that the strip steel moves between the roll gaps of the multiple stands. The main controller is used to execute the method described in any one of claims 1-6.

9. A storage medium storing a computer program, characterized in that, When the computer program is executed, it causes the strip cold rolling system to perform the method as described in any one of claims 1 to 6.

10. A computer program product comprising a computer program that, when run, causes a strip cold rolling system to perform the method as described in any one of claims 1 to 6.

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