Strip steel slitting method and device and strip steel cold rolling system

Abstract

The invention 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 rack of the rolling mill, the thickness of the strip steel is thinned, and the length of the strip steel is extended and lengthened, so that the extension length of any section of strip steel is increased along with the increase of the times of the strip steel being rolled by the roll gap of the rack in the moving process; according to the initial thickness of the strip steel before the strip steel is rolled by the first rack, the target thickness of the strip steel after the strip steel is rolled by the last rack in the moving direction, the pre-recorded distance between the two adjacent racks, the number of the racks and the relative reduction rate of each rack, the thickness of the strip steel is calculated; according to the distance between the last rack of the strip steel in the moving direction and the slitting equipment and the set correction factor, the to-be-slit length of the strip steel between the first rack in the moving direction and the slitting equipment after the strip steel is rolled by the multiple racks is determined, and the accuracy of the determined to-be-slit length is high. Therefore, strip steel with unqualified thickness can be accurately slit.

Description

Technical Field

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

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

[0003] Generally, a rolling mill includes a plurality of racks arranged at intervals, the roll gap of each rack is used to roll the strip, and the coiler is used to coil the strip so that the strip moves between the roll gaps of the plurality of racks. In the rolling step, the cold rolling system of the strip needs to be shut down due to factors such as tooling switching, equipment shutdown, and quality confirmation. In the case of shutdown, the strip is continuously stamped between the roll gaps of the racks of the rolling mill, causing deformation of the surface of the strip and making the thickness unqualified. Therefore, it is necessary to remove the unqualified strip segments. At present, the unqualified thickness of the strip segments is mainly determined by manual observation, which is inaccurate in determining the unqualified thickness of the strip segments, resulting in inaccurate removal of the unqualified strip segments. Summary of the invention

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

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

[0006] The main controller obtains the initial thickness of the strip before being rolled by the first stand in the moving direction and the target thickness of the strip after being rolled by the last stand in the moving direction when determining that the rolling mill is stopped;

[0007] The main controller determines the length of the strip to be cut between the first stand in the moving direction and the cutting device after being rolled by multiple stands according to 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 in the moving direction of the strip and the cutting device, and the set correction factor;

[0008] When the main controller determines that the rolling mill is restarted, the main controller obtains the length of the strip coiled by the coiler;

[0009] The main controller controls the slitting equipment to slit the strip when determining that the length of the strip coiled by the coiler reaches the length to be slit.

[0010] In some embodiments, the main controller determines the length of the strip to be cut after being rolled by multiple racks between the first rack in the moving direction and the slitting device according to the initial thickness, the target thickness, the pre-recorded distance between two adjacent racks, the number of racks, the relative reduction rate of each rack, the distance between the last rack in the moving direction of the strip and the slitting device, and the set correction factor, including:

[0011] According to the formula The length of the strip to be cut after being rolled by multiple stands between the first stand and the cutting equipment in the moving direction, where S is the length to be cut, ε 1 is the relative reduction rate of the first stand in the moving direction of the strip, ε 2 is the relative reduction rate of the second stand in the moving direction of the strip, ε 3 is the relative reduction rate of the third stand in the moving direction of the strip, ε n is the relative reduction rate of the nth rack in the moving direction of the strip, a is the distance between two adjacent racks; H is the initial thickness, h is the target thickness, b is the distance between the last rack and the slitting equipment in the moving direction of the strip, and k is the set correction factor.

[0012] In some implementations, the correction factor k is set to satisfy -0.3(n-1)×a≤k≤0.3(n-1)×a.

[0013] In some embodiments, when the main controller determines that the length of the steel strip coiled by the coiler reaches the length to be cut, the main controller controls the cutting device to cut the steel strip, including:

[0014] When the main controller determines that the length of the strip coiled by the coiler reaches the set length, it sends a slitting preparation instruction to the slitting device to control the slitting device to perform the slitting preparation operation;

[0015] When the main controller determines that the length of the strip steel coiled by the coiler reaches the length to be cut, it controls the cutting equipment that is ready for cutting to cut the strip steel.

[0016] In some implementations, the length of the instruction sent meets Among them, L is the length of the command issued, and S is the length to be cut.

[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 strip slitting device, which is configured in a main controller of a strip cold rolling system, wherein the strip cold rolling system further comprises a rolling mill, a coiler, and a slitting device, wherein the rolling mill comprises a plurality of racks arranged at intervals, wherein the roll gap of each rack is used for rolling the strip, and the coiler is used for coiling the strip, so that the strip moves between the roll gaps of the plurality of racks. The device provided by the present application comprises:

[0019] A data acquisition unit, for acquiring, when it is determined that the rolling mill is stopped, an initial thickness of the strip before being rolled by a first stand in a moving direction and a target thickness of the strip after being rolled by a last stand in the moving direction;

[0020] The unit for determining the length to be cut is used to determine the length to be cut of the strip between the first stand in the moving direction and the cutting device after being rolled by multiple stands according to 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 in the moving direction of the strip and the cutting device, and the set correction factor;

[0021] A coiling length acquisition unit, used to acquire the length of the strip coiled by the coiler when the rolling mill is restarted;

[0022] The strip slitting unit is used to control the slitting equipment to slit the strip when the length of the strip coiled by the coiler reaches the length to be slit.

[0023] In the third aspect, the present 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 a plurality of frames arranged at intervals, the roll gap of each frame is used for rolling the strip, the coiler is used for coiling the strip so that the strip moves between the roll gaps of the plurality of frames, and the main controller is used to execute the method provided in the first aspect of the present application.

[0024] In a fourth aspect, the present application further provides a storage medium storing a computer program. When the computer program is executed, the strip cold rolling system executes the method executed by the main controller provided in the first aspect of the present application.

[0025] In a fifth aspect, the present application also provides a computer program product, including a computer program, which, when executed, enables the strip cold rolling system to execute the method executed by the main controller in the first aspect of the present application.

[0026] The present application provides a strip slitting method, device and strip cold rolling system. It can be understood that after the strip is rolled by the roll gap of any frame of the rolling mill, the thickness of the strip will become thinner and the length will be extended and lengthened. The more times any section of the strip is rolled by the roll gap of the frame during the movement, the longer the extension length of the section of the strip will be. Therefore, the main controller can determine the length of the strip to be slit after being rolled by multiple frames between the first frame and the slitting device in the moving direction according to the initial thickness of the strip before being rolled by the first frame and the target thickness of the strip after being rolled by the last frame in the moving direction, the pre-recorded distance between two adjacent frames, the number of frames, the relative reduction rate of each frame, the distance between the last frame and the slitting device in the moving direction of the strip, and the set correction factor. In this way, the accuracy of the determined length to be slit is high. When the rolling mill is restarted, the length of the strip coiled by the coiler is obtained; when the length of the strip coiled by the coiler reaches the length to be cut, the cutting device is controlled to cut the strip. In this way, the strip with unqualified thickness can be accurately cut out. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] Figure 1 A schematic diagram of the structure of a strip steel slitting system provided in an embodiment of the present application;

[0029] Figure 2 A flow chart of a strip steel slitting method provided in an embodiment of the present application;

[0030] Figure 3 A functional module block diagram of the strip steel slitting device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] Hereinafter, embodiments of the present disclosure will 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 present disclosure. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0032] Various structural schematic diagrams according to embodiments of the present disclosure are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may further design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0033] In the context of the present disclosure, when a layer / element is referred to as being "on" another layer / element, the layer / element may be directly on the other layer / element or an intervening layer / element may exist therebetween. In addition, if a layer / element is "on" another layer / element in one orientation, the layer / element may be "below" the other layer / element when the orientation is reversed.

[0034] The following is a detailed description of the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems with specific embodiments. The following 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 the present application will be described below in conjunction with the accompanying drawings.

[0035] The present application embodiment provides a strip steel slitting method, which is applied to a strip steel cold rolling system. Figure 1 As shown in the figure, the strip cold rolling system includes a rolling mill, a coiler 104, a slitting device 103 and a main controller (not shown in the figure). The rolling mill includes a plurality of racks 102 arranged at intervals, the roll gap of each rack 102 is used to roll the strip 101, and the coiler 104 is used to coil the strip 101 so that the strip 101 moves between the roll gaps of the plurality of racks 102. Figure 2 As shown, the method provided in the embodiment of the present application includes:

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

[0037] Exemplarily, the initial thickness and the target thickness are preconfigured or received from the terminal device.

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

[0039] Specifically, according to the formula

[0040] Determine the length of the strip steel 101 to be cut after being rolled by multiple stands 102 between the first stand 102 and the cutting device 103 in the moving direction. Where S is the length to be cut, ε 1 is the relative reduction rate of the first stand 102 of the strip 101 in the moving direction, ε 2 is the relative reduction rate of the second stand 102 in the moving direction of the strip 101, ε 3 is the relative reduction rate of the third stand 102 of the strip 101 in the moving direction, ε n is the relative reduction rate of the nth rack 102 in the moving direction of the strip 101, a is the distance between two adjacent racks 102, H is the initial thickness, h is the target thickness, b is the distance between the last rack 102 in the moving direction of the strip 101 and the slitting device 103, and k is the set correction factor. It can be understood that the relative reduction rate of the rack 102 and the distance between two adjacent racks 102 are all related to the extended length of the strip 101.

[0041] It should be noted that Figure 1 As shown, the strip cold rolling system includes n racks 102, and the n racks 102 are respectively rack 1, rack 2, rack 3, rack 4, ..., and rack n in the moving direction of the strip 101. It can be understood that the strip 101 section between rack 1 and rack 2 is rolled n-1 times, the strip 101 section between rack 2 and rack 3 is rolled n-2 times, ..., and the strip 101 section between rack n-1 and rack n is rolled n times. Then, the thickness h of the strip 101 section between rack 1 and rack 2 (i.e., the strip 101 after being rolled by rack 1) can be obtained. 1 h 1 =H×(1-ε 1 ). It can be understood that since the thickness and width of the steel strip 101 before and after rolling change slightly and can be ignored, according to the principle that the volume of the steel strip 101 before and after rolling remains unchanged, h 1 ×a=h×L 1-2 , can be obtained Among them, L 1-2is the length of the strip steel 101 section between rack 1 and rack 2 after being rolled by rack 1; similarly, Among them, L 2-3 h is the length of the strip 101 between stands 2 and 3 after being rolled by stand 2, 2 is the thickness of the steel strip 101 after being rolled by the stand 2; Among them, L 3-4 h is the length of the strip 101 between stands 3 and 4 after being rolled by stand 3, 3 is the thickness of the steel strip 101 after being rolled by the stand 3, Among them, L (n-1)-n h is the length of the strip 101 between stands n-1 and n after being rolled by stand n-1, n-1 is the thickness of the steel strip 101 after being rolled by stand n-1. 1-2 +L 2-3 +L 3-4 +…+L (n-1)-n +b+k, so we can get the formula

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

[0043] S203: When determining that the rolling mill is restarted, the main controller obtains the length of the strip steel 101 coiled by the coiler 104.

[0044] S204: When the main controller determines that the length of the steel strip 101 wound by the coiler 104 reaches the length to be cut, the main controller controls the cutting device 103 to cut the steel strip 101.

[0045] Specifically, S204 can be specifically implemented as follows: when the main controller determines that the length of the steel strip 101 wound by the coiler 104 reaches the set length for sending instructions, the main controller sends a slitting preparation 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 steel strip 101 wound by the coiler 104 reaches the length to be slitting, the main controller controls the slitting device 103 that has been prepared for slitting to slitting the steel strip 101. In some embodiments, the length of the instruction sent satisfies Wherein, L is the length of the instruction issued, and S is the length to be cut. In this way, the cutting device 103 can prepare for cutting in advance (such as initialization and power-on, etc.) to ensure that the strip steel 101 can be accurately cut according to the length to be cut later.

[0046] According to the inventor's test, the thickness of the strip 101 before entering the first rack 102 is H=2.87mm, and the thickness of the strip 101 output from the last rack 102 is h=0.595mm; the number of racks 102 n=5, the distance between two adjacent racks 102 a=6m, and the distance from the last rack 102 to the slitting device 103 b=3m; the relative reduction rates of the five racks 102 are ε 1 =0.35541,ε 2 =0.37622,ε 3 =0.3344,ε 4 =0.22984,ε 5 =0.05. Then we can use the formula

[0047]

[0048] It can be obtained that S=57.215m, wherein, -0.3×4×6m≤k≤0.3×4×6m, i.e., -7.2m≤k≤7.2m, and k=1 is selected in the embodiment of the present application; when the instruction-issuing length L satisfies 0m≤L≤19.072m, L=10m is selected to prepare the slitting instruction, and when S=57.215m, the slitting equipment 103 that is prepared for slitting is controlled to slitting the strip 101, and the slitting of the strip 101 has high precision.

[0049] In summary, the embodiment of the present application provides a strip slitting method. Since the strip 101 becomes thinner and longer in length after being rolled by the roll gap of any frame 102 of the rolling mill, the more times any section of the strip 101 is rolled by the roll gap of the frame 102 during the movement, the longer the extension length of the section of the strip 101 is. Therefore, the main controller can determine the length of the strip 101 to be slit after being rolled by multiple frames 102 between the first frame 102 and the slitting device 103 in the moving direction according to the initial thickness of the strip 101 before being rolled by the first frame 102 and the target thickness of the strip 101 after being rolled by the last frame 102 in the moving direction, the pre-recorded distance between two adjacent frames 102, the number of frames 102, the relative reduction rate of each frame 102, the distance between the last frame 102 and the slitting device 103 in the moving direction of the strip 101, and the set correction factor. In this way, the accuracy of the determined length to be cut is high. When it is determined that the rolling mill is restarted, the length of the strip steel 101 coiled by the coiler 104 is obtained; when it is determined that the length of the strip steel 101 coiled by the coiler 104 reaches the length to be cut, the slitting device 103 is controlled to cut the strip steel 101. In this way, the strip steel 101 with unqualified thickness can be accurately cut out.

[0050] In addition, the embodiment of the present application also provides a strip steel slitting device, which is configured in the main controller of the strip steel cold rolling system (not shown in the drawings). Figure 1 As shown, the strip cold rolling system also includes a rolling mill, a coiler 104, and a slitting device 103. The rolling mill includes a plurality of racks 102 arranged at intervals. The roll gap of each rack 102 is used to roll the strip 101. The coiler 104 is used to coil the strip 101 so that the strip 101 moves between the roll gaps of the plurality of racks 102. It should be noted that the strip slitting device provided in the embodiment of the present application has the same basic principle and technical effects as those in the above embodiment. For the sake of brief description, for matters not mentioned in the embodiment of the present application, reference may be made to the corresponding contents in the above embodiment. Figure 3 As shown, the device provided in the embodiment of the present application includes a data acquisition unit, a unit for determining the length to be cut, a unit for acquiring the coiling length, and a strip cutting unit.

[0051] A data acquisition unit, for acquiring, when it is determined that the rolling mill is stopped, an initial thickness of the steel strip 101 in the moving direction before being rolled by the first stand 102 and a target thickness of the steel strip 101 in the moving direction after being rolled by the last stand 102;

[0052] The unit for determining the length to be cut is used to determine the length to be cut of the strip 101 between the first rack 102 in the moving direction and the slitting device 103 after being rolled by multiple racks 102 according to the initial thickness, the target thickness, the pre-recorded distance between two adjacent racks 102, the number of racks 102, the relative reduction rate of each rack 102, the distance between the last rack 102 in the moving direction of the strip 101 and the slitting device 103, and the set correction factor;

[0053] A coiling length acquisition unit, used for acquiring the length of the strip steel 101 coiled by the coiler 104 when it is determined that the rolling mill is restarted;

[0054] The strip slitting unit is used to control the slitting device 103 to slit the strip 101 when it is determined that the length of the strip 101 coiled by the coiler 104 reaches the length to be slitting.

[0055] In some embodiments, the unit for determining the length to be cut is specifically configured to determine the length of the cut according to the formula The length of the strip steel 101 to be cut after being rolled by multiple stands 102 between the first stand 102 and the cutting device 103 in the moving direction, where S is the length to be cut, ε 1 is the relative reduction rate of the first stand 102 of the strip 101 in the moving direction, ε 2 is the relative reduction rate of the second stand 102 in the moving direction of the strip 101, ε 3is the relative reduction rate of the third stand 102 of the strip 101 in the moving direction, ε n is the relative reduction rate of the nth rack 102 of the strip 101 in the moving direction, a is the distance between two adjacent racks 102; H is the initial thickness, h is the target thickness, b is the distance between the last rack 102 of the strip 101 in the moving direction and the slitting device 103, and k is the 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 instruction to the slitting device 103 when it is determined that the length of the strip 101 coiled by the coiler 104 has reached the set instruction-issued length, so as to control the slitting device 103 to perform a slitting preparation operation; when it is determined that the length of the strip 101 coiled by the coiler 104 has reached the length to be cut, control the slitting device 103 that is ready for slitting to cut the strip 101.

[0057] In some implementations, the length of the instruction sent meets Among them, L is the length of the command issued, and S is the length to be cut.

[0058] In addition, an embodiment of the present 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 a plurality of frames arranged at intervals, the roll gap of each frame is used to roll the strip, the coiler is used to coil the strip so that the strip moves between the roll gaps of multiple frames, and the main controller is used to execute the method provided in the above embodiment of the present application.

[0059] In addition, an embodiment of the present application further provides a storage medium, which stores a computer program. When the computer program is executed, the strip cold rolling system executes the method executed by the main controller provided in the above embodiment of the present application.

[0060] In addition, an embodiment of the present application also provides a computer program product, including a computer program. When the computer program is executed, the strip cold rolling system executes the method executed by the main controller provided in the above embodiment of the present application.

[0061] In the above description, the technical details such as the patterning of each layer are not described in detail. However, those skilled in the art should understand that various technical means can be used to form layers, regions, etc. of desired shapes. In addition, in order to form the same structure, those skilled in the art can also design methods that are not completely the same as the methods described above. In addition, although the various embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage.

[0062] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0063] 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 equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for slitting a strip steel, characterized in that: Applied to a strip steel cold rolling system, the strip steel cold rolling system comprises a rolling mill, a coiler, a slitting device and a main controller, the rolling mill comprises a plurality of racks arranged at intervals, the roll gap of each rack is used for rolling the strip steel, the coiler is used for coiling the strip steel, so that the strip steel moves between the roll gaps of the plurality of racks, the method comprises: The main controller, when determining that the rolling mill is stopped, obtains the initial thickness of the steel strip before being rolled by the first stand in the moving direction and the target thickness of the steel strip after being rolled by the last stand in the moving direction; The main controller determines the length of the strip to be cut between the first rack in the moving direction and the cutting device after being rolled by the multiple racks according to the initial thickness, the target thickness, the pre-recorded distance between two adjacent racks, the number of racks, the relative reduction rate of each rack, the distance between the last rack in the moving direction of the strip and the cutting device, and the set correction factor; The main controller obtains the length of the strip coiled by the coiler when determining that the rolling mill is restarted; When determining that the length of the steel strip coiled by the coiler reaches the length to be cut, the main controller controls the cutting device to cut the steel strip.

2. The method according to claim 1, characterized in that The main controller determines the length of the strip to be cut between the first rack in the moving direction and the cutting device after being rolled by the multiple racks according to the initial thickness, the target thickness, the pre-recorded distance between two adjacent racks, the number of racks, the relative reduction rate of each rack, the distance between the last rack of the strip in the moving direction and the cutting device, and the set correction factor, including: According to the formula Determine the length of the strip to be cut after being rolled by multiple stands between the first stand and the slitting device in the moving direction, where S is the length to be cut, ε1 is the relative reduction rate of the strip in the first stand in the moving direction, ε2 is the relative reduction rate of the strip in the second stand in the moving direction, ε3 is the relative reduction rate of the strip in the third stand in the moving direction, ε n is the relative reduction rate of the nth rack of the strip in the moving direction, a is the distance between two adjacent racks; H is the initial thickness, h is the target thickness, b is the distance between the last rack 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 -0.3(n-1)×a≤k≤0.3(n-1)×a.

4. The method according to claim 1, characterized in that: The main controller controls the slitting device to slit the steel strip when determining that the length of the steel strip coiled by the coiler reaches the length to be slit, including: When the main controller determines that the length of the strip coiled by the coiler reaches the set length for which the instruction is issued, the main controller sends a slitting preparation instruction to the slitting device to control the slitting device to perform a slitting preparation operation; When determining that the length of the steel strip coiled by the coiler reaches the length to be cut, the main controller controls the slitting equipment that is ready for slitting to slit the steel strip.

5. The method according to claim 4, characterized in that The length of the instruction sent meets Wherein, 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 preconfigured or received from a terminal device.

7. A strip steel slitting device, characterized in that: A main controller configured in 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, the roll gap of each rack being used for rolling the strip steel, the coiler being used for coiling the strip steel so that the strip steel moves between the roll gaps of the plurality of racks, the device comprising: a data acquisition unit, for acquiring, when it is determined that the rolling mill is stopped, an initial thickness of the steel strip before being rolled by the first stand in the moving direction and a target thickness of the steel strip after being rolled by the last stand in the moving direction; a unit for determining the length to be cut, for determining the length to be cut of the strip between the first rack in the moving direction and the slitting device after being rolled by a plurality of the racks according to the initial thickness, the target thickness, the pre-recorded distance between two adjacent racks, the number of the racks, the relative reduction rate of each rack, the distance between the last rack in the moving direction of the strip and the slitting device, and a set correction factor; A coiling length acquisition unit, used for acquiring the length of the strip coiled by the coiler when it is determined that the rolling mill is restarted; The strip slitting unit is used to control the slitting device to slit the strip when it is determined that the length of the strip coiled by the coiler reaches the length to be slit.

8. A strip cold rolling system, characterized in that: It comprises a rolling mill, a coiler, a slitting device and a main controller, wherein the rolling mill comprises a plurality of racks arranged at intervals, the roll gap of each rack being used for rolling strip steel, the coiler being used for coiling the strip steel so that the strip steel moves between the roll gaps of the plurality of racks, and the main controller being used for executing any of the methods described in claims 1-6.

9. A storage medium storing a computer program, characterized in that: When the computer program is executed, the strip cold rolling system executes the method executed by the main controller in any one of claims 1 to 6.

10. A computer program product, comprising a computer program, which, when executed, enables a steel strip cold rolling system to execute the method executed by a main controller as claimed in any one of claims 1 to 6.

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