Method, device and apparatus for reducing cross-marking of a steel strip inner ring

Abstract

The application discloses a control method, device and equipment for reducing the transverse fold mark of the inner ring of a strip steel, and the strip steel head is accurately positioned on the winding drum soft area of a coiler; the length of the strip steel wound by a belt winder, the winding tension of the belt winder and the dynamic tension of the unit are determined; the strip steel whose head has been accurately positioned on the winding drum soft area of the coiler is wound by the belt winder according to the length of the strip steel wound by the belt winder and the winding tension of the belt winder; the strip steel which has been wound is continuously wound by the unit according to the dynamic tension of the unit until the winding work is completed. Through the above mode, the existing operation conditions of the factory are fully utilized, the existing equipment does not need to be greatly technically transformed, the transverse fold mark defect of the inner ring of the strip steel during the strip steel winding is obviously reduced without high technical transformation investment, the unit yield is improved, the effect of reducing cost and increasing benefit is remarkable, and therefore the competitiveness of the strip steel production is obviously improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of plate strip control technology of recoiling unit, in particular to a control method, device and equipment for reducing the inner circle transverse fold mark of strip steel. BACKGROUND

[0002] When the recoiling unit produces products with a thickness of greater than or equal to 1.2 mm, transverse fold mark defects will occur on the coil. The transverse fold mark defects generally occur in the width direction and can run through the entire width or only in the edge portion, and the shape presents a transverse stripe perpendicular to the running direction of the unit. The root cause of the defect is that the head of the strip steel protrudes after entering the coiler. According to the coiling process, when the strip steel passes through the coiler, the first layer of strip steel is wound on the coil under the action of the belt coiler. Due to the existence of the thickness of the strip steel, the head of the strip steel will form a protrusion. Thereafter, the protrusion is replicated layer by layer, and the transverse fold mark is formed on the outer side of the protrusion under the radial pressure of the inner layer of strip steel, which seriously affects the surface quality of the strip steel. Currently, the average length of the inner circle transverse fold mark of the strip steel can reach 100 m per coil, resulting in a low yield of the strip steel, a large number of feedback from users, and a significant increase in production cost. The main reasons are as follows:

[0003] 1. The structure of the flexible sleeve itself. Since the soft zone interval of the existing coiler coil is relatively narrow, generally only 20 mm wide, the relative movement between the strip steel and the coil causes the strip steel to deviate from the soft drive positioning range of the coiler, and the head of the strip steel cannot be accurately positioned in the middle of the soft drive interval of the flexible sleeve, resulting in the inner circle transverse fold mark;

[0004] 2. Insufficient detection sensitivity of the linear laser sensor. When the strip steel enters the detection area of the coiler, the strip steel often triggers the coiler to act prematurely or lag, and the head of the strip steel cannot be accurately positioned in the soft zone of the coil, resulting in the inner circle transverse fold mark;

[0005] 3. Unreasonable tension of the unit. Unreasonable tension of the unit will cause the inner circle transverse fold mark in the inner circle of the coil, and the defect will be added layer by layer during operation;

[0006] 4. Excessive tension of the belt coiler belt. Excessive tension of the belt coiler belt during coiling will cause the inner circle to be tightly wound, resulting in the inner circle transverse fold mark.

[0007] In the face of this situation, it is urgent to provide a control technology that can effectively reduce the inner circle transverse fold mark of the strip steel after recoiling to solve the above problems. SUMMARY

[0008] The present application aims to provide a method that can effectively reduce the inner circle transverse fold mark of the strip steel during recoiling by skillfully utilizing the existing operating conditions of the factory, without the need for major technical transformation of the existing equipment. The method avoids large technical transformation investment, improves the yield of the recoiling unit, and significantly reduces costs and increases efficiency, thereby significantly improving the competitiveness of strip steel production.

[0009] To achieve the above object, the present application provides the following technical solutions.

[0010] A control method for reducing the transverse fold mark of the inner circle of a strip steel, the method comprising:

[0011] accurately positioning the head of the strip steel in the soft zone of the winding drum of the coiler;

[0012] determining the length of the strip steel to be wound by the belt winder, the winding tension of the belt winder, and the dynamic tension of the unit;

[0013] winding the strip steel, whose head has been accurately positioned in the soft zone of the winding drum of the coiler, by the belt winder according to the length of the strip steel to be wound by the belt winder and the winding tension of the belt winder;

[0014] continuing to wind the strip steel, which has been wound by the belt winder, by the unit according to the dynamic tension of the unit until the winding work is completed, so as to reduce the transverse fold mark of the inner circle of the strip steel.

[0015] As a further improvement of the present application, the determination of the length of the strip steel to be wound by the belt winder, the winding tension of the belt winder, and the dynamic tension of the unit comprises the steps of:

[0016] selecting the length of the strip steel to be wound by the belt winder, the winding tension of the belt winder, and the dynamic tension of the unit according to the type and thickness of the strip steel, so as to establish the data relationship between the tension and the number of the inner layer press mark of the coil when the strip steel is wound by the coiler;

[0017] determining the length of the strip steel to be wound by the belt winder, the winding tension of the belt winder, and the dynamic tension of the unit according to the data relationship between the tension and the number of the inner layer press mark of the coil when the strip steel is wound by the coiler.

[0018] As a further improvement of the present application, the accurate positioning of the head of the strip steel in the soft zone of the winding drum of the coiler comprises:

[0019] monitoring the relative position between the head of the strip steel and the coiler by using a point laser sensor;

[0020] when the head of the strip steel reaches the specified position, driving the winding drum to start rotating, and simultaneously performing the speed control of the soft zone positioning of the winding drum according to the timing sequence, so as to accurately position the head of the strip steel in the soft zone of the winding drum of the coiler.

[0021] As a further improvement of the present application, the speed control of the soft zone positioning of the winding drum according to the timing sequence comprises:

[0022] setting multiple soft zone positioning modes of the winding drum for different sizes of the winding drum and different winding modes;

[0023] From the plurality of soft zone positioning modes of the winding drum, a suitable positioning mode is selected according to the thickness of the strip steel, the type of the steel, the type of the winding drum used and the suitable winding mode to time-sequentially optimize the positioning of the soft zone on the winding drum.

[0024] As a further improvement of the present application, the accurate positioning of the head of the strip steel in the soft zone of the winding drum of the coiler comprises:

[0025] The soft zone interval of the winding drum of the coiler is widened to improve the accuracy of the positioning of the head of the strip steel in the soft zone of the winding drum of the coiler.

[0026] The present application also provides a control device for reducing the transverse print of the inner circle of the strip steel, which comprises:

[0027] A positioning unit is configured to accurately position the head of the strip steel in the soft zone of the winding drum of the coiler.

[0028] A determination unit is configured to determine the length of the strip steel to be coiled by the belt coiler, the coiling tension of the belt coiler and the dynamic tension of the unit.

[0029] A belt coiler is configured to coil the strip steel whose head has been accurately positioned in the soft zone of the winding drum of the coiler according to the length of the strip steel to be coiled by the belt coiler and the coiling tension of the belt coiler.

[0030] A coiler unit is configured to continue to coil the strip steel whose coiling has been completed according to the dynamic tension of the unit until the coiling work is completed.

[0031] As a further improvement of the present application, the determination unit comprises:

[0032] A first selection module is configured to select the length of the strip steel to be coiled by the belt coiler according to the type of the strip steel and the thickness of the strip steel.

[0033] A second selection module is configured to select the coiling tension of the belt coiler according to the type of the strip steel and the thickness of the strip steel.

[0034] A third selection module is configured to select the dynamic tension of the unit according to the type of the strip steel and the thickness of the strip steel.

[0035] A building module is configured to build a data relationship between the tension and the number of print circles of the inner layer of the coil when the strip steel is coiled by the coiler.

[0036] A determination module is configured to determine the length of the strip steel to be coiled by the belt coiler, the coiling tension of the belt coiler and the dynamic tension of the unit according to the data relationship between the tension and the number of print circles of the inner layer of the coil when the strip steel is coiled by the coiler.

[0037] As a further improvement of the present application, the positioning unit comprises:

[0038] A point laser sensor is used to monitor the relative position between the strip head and the coiler.

[0039] A driving module is used to drive the reel to start rotating when the strip head reaches the specified position, and to control the soft zone positioning speed of the reel in the synchronous transmission timing, so as to accurately position the strip head in the soft zone of the reel.

[0040] As a further improvement of the application, the driving module comprises:

[0041] A setting sub-module is used to set multiple reel soft zone positioning modes for different reel sizes and different coiling modes.

[0042] A selection sub-module is used to select a suitable positioning mode from the multiple reel soft zone positioning modes according to the thickness of the strip, the type of steel, the reel model used and the appropriate coiling mode, and to perform timing optimization positioning on the soft zone on the reel.

[0043] As a further improvement of the application, the device comprises:

[0044] A coiler reel with a soft zone interval width of 20mm≤soft zone interval width≤30mm.

[0045] The application also provides a control device for reducing the transverse fold mark of the inner circle of a strip, which comprises a processor and a memory; wherein,

[0046] The memory is used to store machine executable instructions.

[0047] The processor is used to read and execute the machine executable instructions stored in the memory, so as to realize the control method for reducing the transverse fold mark of the inner circle of a strip.

[0048] The technical effects and advantages of the application are as follows:

[0049] The control method, device and equipment for reducing the transverse fold mark of the inner circle of a strip of the application accurately position the strip head in the soft zone of the reel of the coiler, determine the coiling strip length, the coiling tension of the belt coiler and the dynamic tension of the unit when the strip is being threaded, perform coiling of the strip whose head has been accurately positioned in the soft zone of the reel of the coiler by the belt coiler according to the coiling strip length and the coiling tension of the belt coiler, and continue to perform coiling of the strip whose coiling has been completed by the unit according to the dynamic tension of the unit until the coiling work is completed. In this way, the application makes full use of the existing operating conditions of the plant, does not need to make large technical transformation to the existing equipment, significantly reduces the transverse fold mark defect of the inner circle of the strip when the strip is being threaded without high technical transformation investment, improves the unit yield, and has remarkable effects of reducing cost and increasing benefit, thereby significantly improving the competitiveness of the strip production.

[0050] Additional features and advantages of the present application will be set forth in the description that follows, and in part will be apparent from the description, or can be learned by practice of the application. The objectives and other advantages of the present application will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 A flow chart of the control method for reducing the transverse fold mark of the inner circle of the strip steel according to the present application. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0053] To solve the problems in the prior art, the present application discloses a control method for reducing the transverse fold mark of the inner circle of the strip steel, as shown in Figure 1 The method comprises the following key steps: accurately positioning the head of the strip steel in the soft area of the winding drum of the coiler; determining the length of the strip steel wound by the belt winder, the winding tension of the belt winder and the dynamic tension of the unit; according to the determined length of the strip steel wound by the belt winder and the winding tension of the belt winder, the strip steel whose head has been accurately positioned in the soft area of the winding drum of the coiler is preliminarily wound by the belt winder; according to the determined dynamic tension of the unit, the strip steel which has been wound is continuously wound by the unit until the winding work is completed. Through the above method, the transverse fold mark defect generated in the inner circle of the strip steel when the strip steel is rewound by the rewinder unit is effectively reduced.

[0054] Specifically, the present application realizes accurate positioning of the strip head on the soft zone of the winding drum of the coiler by the following technical improvements. Firstly, the linear laser sensor used in the past to detect the relative position of the strip head to the coiler is changed to a less-interfering point laser sensor, so that when the strip head is delivered to the designated position near the coiler, the point laser sensor can accurately detect the relative position of the strip head to the coiler in time and feed back the detection signal to the coiler in time, effectively avoiding the occurrence of false triggering. Then the coiler drives the winding drum to start rotating and controls the positioning speed of the soft zone of the winding drum at a set synchronous transmission timing (i.e., controls the winding drum to rotate at a certain speed and positions the soft zone at the right position at the right time), with the purpose of ensuring that the strip head can be accurately positioned on the soft zone of the winding drum, so as to effectively avoid a large number of cross-fold defects in the inner circle caused by the protrusion of the strip head in the subsequent winding process. Secondly, the present application sets multiple winding drum soft zone positioning modes for different winding drum sizes and different winding modes when controlling the positioning speed of the soft zone of the winding drum at a set synchronous transmission timing; for example, for the two existing winding drum models (Φ508mm and Φ610mm) corresponding to two winding modes respectively, four winding drum soft zone positioning modes are set, and when the positioning speed of the soft zone of the winding drum is controlled, the appropriate positioning mode can be selected from the four winding drum soft zone positioning modes according to the thickness of the strip, the type of the strip, the type of the winding drum used and the appropriate winding mode, to further improve the accuracy of the positioning of the soft zone of the winding drum and ensure that the strip head is successfully positioned on the soft zone of the winding drum. Thirdly, the present application further improves the accuracy of the positioning of the soft zone of the winding drum by widening the soft zone interval of the winding drum of the coiler to 30mm.

[0055] Further, when optimizing the strip threading of the coiler set, the present application first selects different strip length, winding tension and dynamic tension of the set according to the type and thickness of the strip, and uses them to test the rewinding of the strip, and at the same time, combines with the method of mathematical statistical analysis to establish the data relationship between the tension and the number of inner layer press marks of the coil when the strip is threaded into the coiler; according to the established data relationship between the tension and the number of inner layer press marks of the coil, the strip length, winding tension and dynamic tension of the set during threading are further determined, so that the strip with the head accurately positioned on the soft zone of the coiler is wound by the belt winder according to the determined strip length and winding tension; and after winding is completed, the strip with completed winding is further coiled by the set according to the determined dynamic tension of the set, until the coiling work is completed. Through the above method, the present application successfully explores a new coiling method that can effectively reduce cross-fold marks.

[0056] The present application also provides a control device for reducing cross-fold marks of a strip, which comprises:

[0057] The positioning unit is used to accurately position the strip head in the soft zone of the coiler drum;

[0058] The determining unit is used to determine the length of the belt winding aid steel, the winding tension, and the dynamic tension of the unit during belt threading.

[0059] A belt winding aid is used to wind up strip steel whose head is accurately located in the soft zone of the winding machine drum, according to the determined winding length and winding tension of the belt winding aid.

[0060] A coiling unit is used to continue coiling the strip that has already been assisted in coiling, based on the determined dynamic tension of the unit, until the coiling work is completed.

[0061] Furthermore, the device may also include a roll with a wider soft zone. Specifically, the existing roll with a soft zone width of only 20mm can be configured into a winding machine roll with a soft zone width of 20mm < ≤ 30mm, so as to further improve the positioning accuracy of the strip head in the soft zone of the roll.

[0062] Specifically, the determining unit also includes three modules: a selection module, a creation module, and a determining module; among them,

[0063] The first selection module is used to select the length of the strip steel assisted by the belt winding aid based on the type and thickness of the strip steel. The second selection module is used to select the winding tension of the belt winding aid based on the type and thickness of the strip steel. The third selection module is used to select the dynamic tension of the unit based on the type and thickness of the strip steel. The establishment module is used to establish the data relationship between the tension magnitude during strip steel threading and winding and the number of inner layer imprints on the steel coil. The determination module is used to determine the length of the strip steel assisted by the belt winding aid, the winding tension, and the dynamic tension of the unit during strip threading based on the data relationship between the tension magnitude during strip steel threading and winding and the number of inner layer imprints on the steel coil.

[0064] Specifically, the positioning unit includes a point laser sensor and a driving module; among which,

[0065] A dot-matrix laser sensor is used to monitor the relative position of the strip head to the coiler; a drive module is used to drive the drum to start rotating when the strip head reaches the designated position, and to control the drum soft zone positioning speed with synchronous transmission timing, so as to accurately position the strip head in the soft zone of the coiler.

[0066] Specifically, the driver module includes a setting submodule and a selection submodule; among which,

[0067] The setting submodule is used to set multiple soft area positioning modes for different drum sizes and different winding methods; the selection submodule is used to select a suitable positioning mode from the multiple soft area positioning modes based on the strip thickness, steel type, drum model used and appropriate winding method to perform time-series optimized positioning of the soft areas on the drum.

[0068] The present invention also provides a control device for reducing transverse creases on the inner ring of strip steel. The device includes a processor and a memory; wherein the memory is used to store machine-executable instructions; and the processor is used to read and execute the machine-executable instructions stored in the memory to implement the aforementioned control method for reducing transverse creases on the inner ring of strip steel.

[0069] The following detailed description, using specific embodiments, illustrates the effectiveness of the method for reducing transverse creases on the inner ring of steel strip provided by the present invention:

[0070] (1) In June 2019, the feasibility of the scheme was tested theoretically and practically, and the equipment and spare parts that needed to be upgraded and improved were declared; A. The linear laser sensor used in the detection head was changed to a point laser sensor, which effectively reduced interference, avoided false triggering, and improved the accuracy of soft area positioning; B. The original flexible sleeve with a soft area interval of 20mm was changed to a flexible sleeve with a soft area interval of 30mm.

[0071] (2) In January 2020, the improved spare parts were installed, and the timing design of the four soft area positioning modes (Φ508mm upper winding positioning mode logic, Φ508mm lower winding positioning mode, Φ610mm upper winding positioning mode and Φ610mm lower winding positioning mode) was redesigned and optimized.

[0072] (3) In February 2020, the requirements for incoming materials to the unit were increased based on the type of strip steel (including high-strength coils and continuous annealing coils) and the thickness of the strip steel:

[0073] A. Selection mode for the length of the belt winding aid strip;

[0074] B. Selection mode for belt winding tension (static tension);

[0075] C. Dynamic tension selection mode for the winding machine during threading.

[0076] (4) From February to May 2020, the set control program was tested, debugged and gradually stabilized until the target value was achieved.

[0077] Specifically, due to limitations in incoming material specifications, this embodiment tested two types of strip steel (continuous unwinding and high-strength coils) with thicknesses h≤1.2mm and h≤2.0mm. Based on the strip steel thickness, steel type, the user-required inner drum model, and the required winding method, a reasonable positioning mode was selected. For example, this embodiment added control logic for the Φ508mm drum winding positioning mode. The soft zone on the drum was positioned, thereby enabling the strip steel head to be smoothly conveyed to the soft zone position on the drum. Furthermore, this embodiment rationally controls the length of the assisted strip, the assisted winding tension, and the dynamic tension of the unit during the threading process, ultimately determining the optimal threading method as follows: For the first three turns of the strip entering the coiler (8 meters (thickness h≤1.2mm) to 10 meters (thickness h>1.2mm) for continuous unwinding, and 10 meters (thickness h≤1.2mm) to 14 meters (thickness h>1.2mm) for high-strength coils), a micro-tension (static tension) of (1.05-1.3)*300N is used for winding. After the length reaches the set value, the belt assisted winding device is removed. Then, based on the test results, the dynamic range of the unit's dynamic tension is set until the winding work is completed. Final observation shows that this method effectively reduces the transverse crease defects on the inner ring of the strip. Specifically, as shown in Table 1 below: After taking the above measures, the transverse crease of the inner ring of the strip in the rewinding inspection unit has decreased from approximately 100 meters / roll to the current 26.2 meters / roll. Furthermore, the aforementioned invention method also has the advantage of cleverly utilizing existing operating conditions, eliminating the need for major technical modifications to existing equipment, avoiding increased investment in technical upgrades, improving the material yield of the assembly, significantly reducing costs and increasing efficiency, and enhancing the company's market competitiveness.

[0078]

[0079] Table 1: Average length of transverse fold marks on the inner ring of the improved strip

[0080] In summary, the method, apparatus, and equipment for reducing transverse creases on the inner ring of strip steel according to the present invention involve: accurately positioning the strip head in the soft zone of the coiler drum; determining the strip length, coiling tension, and dynamic tension of the unit during strip threading using the belt winding aid; winding the strip with its head accurately positioned in the soft zone of the coiler drum using the belt winding aid based on the strip length and coiling tension; and continuing to wind the strip with the completed winding using the unit based on the dynamic tension of the unit until the winding process is complete. Through this method, the present invention fully utilizes existing plant operating conditions, requires no major technical modifications to existing equipment, significantly reduces transverse crease defects on the inner ring of strip steel during threading while avoiding excessive technical upgrades, improves the unit's yield, and achieves significant cost reduction and efficiency improvement, thereby significantly enhancing the competitiveness of strip steel production.

[0081] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method for reducing the cross-fold mark of the inner circle of a strip, characterized in that, the control method is implemented based on a control device for reducing the cross-fold mark of the inner circle of a strip, the control device comprising a positioning unit, a determining unit, a belt lap coiler and a coiler set, the method comprising: accurately positioning the head of the strip in the soft zone of the winding drum of the coiler; determining the lap length of the strip, the lap tension of the belt lap coiler and the dynamic tension of the set when threading; coiling the strip whose head has been accurately positioned in the soft zone of the winding drum of the coiler by the belt lap coiler according to the lap length of the strip, the lap tension of the belt lap coiler; continuing to coil the strip that has been lapped by the set according to the dynamic tension of the set until the coiling work is completed, thereby reducing the cross-fold mark of the inner circle of the strip; the accurate positioning of the head of the strip in the soft zone of the winding drum of the coiler comprising: 20mm < interval width of the soft zone of the winding drum ≤ 30mm; the accurate positioning of the head of the strip in the soft zone of the winding drum of the coiler further comprising: monitoring the relative position of the head of the strip to the coiler by using a point laser sensor; when the head of the strip reaches the specified position, driving the winding drum to start rotating, and synchronously driving the timing sequence for the soft zone positioning speed control, thereby accurately positioning the head of the strip in the soft zone of the winding drum of the coiler; the synchronous driving of the timing sequence for the soft zone positioning speed control comprising: setting multiple soft zone positioning modes for different winding drum sizes and different coiling modes; selecting a suitable positioning mode from the multiple soft zone positioning modes according to the thickness of the strip, the type of the steel, the type of the winding drum used and the appropriate coiling mode to perform timing optimization positioning on the soft zone of the winding drum; the type of the steel comprising high-strength coil and continuous annealing coil, and the positioning mode comprising up-coiling positioning mode and down-coiling positioning mode; the determination of the lap length of the strip, the lap tension of the belt lap coiler and the dynamic tension of the set when threading comprising the steps of: selecting the lap length of the strip, the lap tension of the belt lap coiler and the dynamic tension of the set according to the type of the strip and the thickness of the strip, thereby establishing the data relationship between the tension size and the number of inner layer press mark of the coil when the strip is threaded into the coiler; determining the lap length of the strip, the lap tension of the belt lap coiler and the dynamic tension of the set according to the data relationship between the tension size and the number of inner layer press mark of the coil when the strip is threaded into the coiler; the lap length of the strip, the lap tension of the belt lap coiler and the dynamic tension of the set when threading comprising: using a micro-tension of (1.05-1.3) × 300N for the first 8 meters of coiling when the continuous annealing coil with a thickness h ≤ 1.2mm enters the coiler; using a micro-tension of (1.05-1.3) × 300N for the first 10 meters of coiling when the continuous annealing coil with a thickness h > 1.2mm enters the coiler; using a micro-tension of (1.05-1.3) × 300N for the first 10 meters of coiling when the high-strength coil with a thickness h ≤ 1.2mm enters the coiler; using a micro-tension of (1.05-1.3) × 300N for the first 14 meters of coiling when the high-strength coil with a thickness h > 1.2mm enters the coiler.

2. The control method of reducing the transverse fold mark of the inner ring of the strip steel according to claim 1, characterized in that, the device comprising: a positioning unit for accurately positioning the head of the strip in the soft zone of the winding drum of the coiler; The determination unit is configured to determine the strip assisting coiling length, the strip assisting tension of the strip assisting coiler and the dynamic tension of the unit during the strip threading; The strip assisting coiler is configured to coil the strip whose head has been accurately positioned in the soft zone of the coiler drum according to the determined strip assisting coiling length and strip assisting tension of the strip assisting coiler; The coiler unit is configured to continue the unit coiling of the strip which has been assisted coiled according to the determined dynamic tension of the unit until the coiling work is completed.

3. The control method of reducing the cross mark of the inner ring of the strip steel according to claim 2, wherein, The determination unit comprises: The first selection module is configured to select the strip assisting coiling length of the strip assisting coiler according to the strip type and the strip thickness; The second selection module is configured to select the strip assisting tension of the strip assisting coiler according to the strip type and the strip thickness; The third selection module is configured to select the dynamic tension of the unit according to the strip type and the strip thickness; The establishment module is configured to establish the data relationship between the tension size and the inner layer impression circle number of the coil during the strip threading of the coiler; The determination module is configured to determine the strip assisting coiling length, the strip assisting tension of the strip assisting coiler and the dynamic tension of the unit during the strip threading according to the data relationship between the tension size and the inner layer impression circle number of the coil during the strip threading of the coiler.

4. The control method of reducing the cross mark of the inner loop of a strip steel according to claim 2 or 3, wherein, The positioning unit comprises: The point laser sensor is configured to monitor the relative position between the head of the strip and the coiler; The driving module is configured to drive the coiler drum to start rotating and to control the positioning speed of the soft zone of the coiler drum in the synchronous driving timing sequence when the head of the strip reaches the specified position, so as to accurately position the head of the strip in the soft zone of the coiler drum.

5. The control method of reducing the cross mark of the inner ring of the strip steel according to claim 4, wherein, The driving module comprises: The setting sub-module is configured to set multiple coiler drum soft zone positioning modes for different coiler drum sizes and different coiling modes; The selection sub-module is configured to select the appropriate positioning mode from the multiple coiler drum soft zone positioning modes according to the thickness of the strip, the type of the strip, the type of the coiler drum used and the appropriate coiling mode to optimize the timing positioning of the soft zone on the coiler drum.

6. The control method of reducing cross mark of a strip steel inner ring according to claim 2, wherein, The device comprises: The coiler drum of the coiler has a soft zone interval width of 20mm to 30mm.

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