Rolling apparatus, coiled system after strip rolling and coiled method after strip rolling

Abstract

The application discloses a rolling device, a strip steel post-rolling coiling system and a strip steel post-rolling coiling method. The strip steel post-rolling coiling system sequentially comprises, from front to back, a cooling device, a supporting roller, a coiler, a pinch roll, a first position sensor and a controller in sequence from back to front of a rolling mill, the pinch roll is arranged between the cooling device and the supporting roller, the first position sensor is arranged at the supporting roller and is used for detecting whether a strip steel head passes through a preset position on the supporting roller, and the controller is connected with the pinch roll and the position sensor and is used for controlling the pinch roll to pinch the strip steel when a signal that the first position sensor detects that the strip steel head passes through the preset position is acquired and controlling the pinch roll to release after the coiler establishes a stable threading tension. The application can reduce or even prevent the strip steel from being provided with a narrow size defect when the strip steel is threaded on the coiler, improves product quality and a yield rate, and has a simple structure and can be automatically controlled.

Description

Technical Field

[0001] This invention belongs to the field of strip steel production technology, and relates to a rolling equipment, as well as a strip steel post-rolling coiling system and a strip steel post-rolling coiling method. Background Technology

[0002] Cold-rolled strip steel is widely used in industries such as home appliances, automobile manufacturing, construction, machinery, precision instruments, office supplies, pressure vessels, power systems, and food packaging due to its high surface quality, thin dimensions, and good formability. Cold-rolled strip steel requires edge trimming during pickling and annealing processes. However, when the head of hot-rolled strip steel is threaded through the coiler, the coiler speed suddenly increases to provide coiling tension, resulting in a sudden increase in tension on the strip. At this time, the hot-rolled strip steel is at a high temperature and has low strength. This sudden increase in tension causes localized narrowing of the strip at this point, i.e., the problem of a narrow head. The thinner the strip, the greater the risk of this narrow head issue.

[0003] A narrow head not only reduces the width of the strip, but also causes wire breakage during pickling and slitting, especially for thin strips of low-carbon steel, where wire breakage is more pronounced. Furthermore, a narrow head can lead to reduced production speed or even shutdown, and may even cause production accidents such as strip breakage in subsequent processes. On the other hand, a narrow head can result in the removal of tens of meters of the head strip in subsequent processes, leading to a decrease in yield and an increase in production costs. Summary of the Invention

[0004] The purpose of this invention is to provide a rolling equipment, a strip coiling system after rolling, and a strip coiling method after rolling to solve the problem of narrow strip head.

[0005] To achieve one of the above objectives, one embodiment of the present invention provides a strip coiling system, which, from front to back, includes a cooling device, idler rollers, and a coiler located behind the rolling mill. The coiling system further includes...

[0006] A pinch roller is disposed between the cooling device and the idler roller;

[0007] A first position sensor is located at the idler roller and is used to detect whether the strip head has passed a preset position on the idler roller;

[0008] The controller is connected to the pinch roller and the position sensor respectively, and is used for:

[0009] When the signal detected by the first position sensor that the strip head has passed the preset position is obtained, the pinch roller is controlled to clamp the strip.

[0010] After the winding machine establishes a stable threading tension, it controls the pinch rollers to loosen.

[0011] As a further improvement of one embodiment of the present invention, the controller is also used for:

[0012] Timing begins when the strip head passes the preset position. After time t1, the pinch roller is released. Here, t1 = (L1 + L2) / v, L1 is the distance the strip travels from the preset position to the coiler inlet, L2 is the preset winding length, and v is the strip threading speed.

[0013] As a further improvement of one embodiment of the present invention, the strip steel post-rolling coiling system further includes a second position sensor and a coiling roller group disposed around the coiler. The coiling roller group includes a first coiling roller located at the inlet of the coiler. The second position sensor is used to detect whether the strip head passes through the first coiling roller.

[0014] The controller is connected to the second position sensor and is used for:

[0015] The signal detected by the second position sensor that the strip head passes through the first winding roller is acquired, and timing is started.

[0016] After time t2, the pinch roller is released, where t2 = L2 / v, L2 is the preset winding length, and v is the strip threading speed.

[0017] As a further improvement of one embodiment of the present invention, the second position sensor is a laser detector disposed inside the winding machine.

[0018] As a further improvement of one embodiment of the present invention, the pinch roller includes a pair of driven rollers arranged opposite each other, and the maximum temperature that the pinch roller can withstand is 700°C.

[0019] To achieve the above-mentioned objectives, one embodiment of the present invention also provides a rolling equipment, including the strip coiling system as described above, and a rolling mill located in front of the coiling system.

[0020] To achieve the above-mentioned objective, one embodiment of the present invention also provides a method for coiling strip steel after rolling, comprising the following steps:

[0021] After the rolled strip is cooled, it passes through the pinch rolls. When the head of the strip passes through the preset position on the idler roller behind the pinch rolls, the pinch rolls are controlled to clamp the strip.

[0022] The strip head is fed into the coiler for threading;

[0023] After the winding machine establishes a stable threading tension, the pinch rollers are controlled to loosen.

[0024] Roll up.

[0025] As a further improvement to one embodiment of the present invention, the step of controlling the release of the pinch roller after the winding machine establishes a stable threading tension specifically includes:

[0026] Timing begins when the strip head passes the preset position. After time t1, the pinch roller is released. Here, t1 = (L1 + L2) / v, L1 is the distance the strip travels from the preset position to the coiler inlet, L2 is the preset winding length, and v is the strip threading speed.

[0027] As a further improvement to one embodiment of the present invention, the step of controlling the release of the pinch roller after the winding machine establishes a stable threading tension specifically includes:

[0028] The timing starts when the strip head passes through the coiler inlet. After time t2, the pinch roller is released. Here, t2 = L2 / v, where L2 is the preset coiling length and v is the strip threading speed.

[0029] As a further improvement of one embodiment of the present invention, the chemical composition of the strip steel, by mass percentage, includes: C≤0.10%, Si≤0.04%, Mn≤0.3%, P≤0.025%, S≤0.015%, with the remainder being Fe and unavoidable impurities;

[0030] The thickness of the strip is ≤2.5mm and the width is ≤1100mm.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: In the rolling equipment, strip coiling system, and strip coiling method of the present invention, since the pinch roll is located after the cooling device and the idler roll is located after the pinch roll, when the first position sensor located at the idler roll detects that the strip head has passed the preset position, it indicates that the strip head has passed the pinch roll. At this time, controlling the pinch roll to clamp the strip allows the strip to have the same conveying speed as when exiting the rolling mill under the action of the pinch roll. Furthermore, after establishing a stable threading tension, the pinch roll is released. Thus, when the coiler threads the strip, even if the coiler speed increases and the tension on the strip suddenly increases, it will not cause the strip between the rolling mill and the pinch roll to be narrowed and deformed due to tension. The strip that has passed through the pinch roll has been cooled and its temperature has decreased, so it will not cause large deformation under the action of coiling tension. Therefore, the present invention can reduce or even prevent narrow-length defects in the strip during coiling, which is beneficial for subsequent cross-cutting, longitudinal cutting, and forming processes of the strip, improving product quality and yield. Moreover, the structure is simple and can be automatically controlled. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the rolling equipment according to an embodiment of the present invention. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0034] In the various illustrations of this invention, for ease of illustration, certain dimensions of structures or parts may be enlarged relative to other structures or parts; therefore, only the basic structure of the subject matter of this invention is used to illustrate the invention.

[0035] It should be understood that although the terms first, second, third, fourth, etc., may be used in this document to describe various elements or structures, the objects being described should not be limited by these terms. These terms are only used to distinguish these objects from one another.

[0036] See Figure 1 One embodiment of the present invention provides a rolling equipment 100, including a rolling mill 1 and a strip steel post-rolling coiling system located behind the rolling mill 1. The rolling mill 1 is used to roll strip steel 200, and the post-rolling coiling system is used to coil the strip steel 200 into a steel coil.

[0037] It is understood that in this invention, "before" and "after" are defined by the order of production steps. For example, if a slab is first rolled into strip 200 by a rolling mill 1 and then sent to a post-rolling coiling system for coiling, then the rolling mill 1 is located in front of the post-rolling coiling system, and the post-rolling coiling system is located behind the rolling mill 1.

[0038] Among them, rolling mill 1 includes a roughing mill and a finishing mill, and the finishing mill adopts a seven-stand finishing mill.

[0039] The strip rolling coiling system includes, from front to back, a cooling device 2, a pinch roll 3, an idler roll 4, and a coiler 5 located behind the rolling mill 1. That is, the pinch roll 3 is located between the cooling device 2 and the idler roll 4.

[0040] The post-rolling winding system also includes a first position sensor 6 and a controller.

[0041] The first position sensor 6 is located at the idler roller 4 and is used to detect whether the head of the strip 200 has passed the preset position on the idler roller 4.

[0042] The controller is connected to the pinch roller 3 and the first position sensor 6 respectively, and is used for:

[0043] When the first position sensor 6 detects that the head of the strip 200 has passed the preset position, the pinch roller 3 is controlled to clamp the strip 200.

[0044] After the winding machine 5 establishes a stable threading tension, it controls the pinch roller 3 to loosen.

[0045] Thus, since the pinch roll 3 is located after the cooling device 2 and the idler roll 4 is located after the pinch roll 3, when the first position sensor 6 located at the idler roll 4 detects that the head of the strip 200 has passed the preset position, it indicates that the head of the strip 200 has passed the pinch roll 3. At this time, controlling the pinch roll 3 to clamp the strip 200 can make the strip 200 have the same conveying speed as when exiting the rolling mill 1 under the action of the pinch roll 3. Furthermore, after establishing a stable threading tension, the pinch roll 3 is controlled to loosen. In this way, when the coiler 5 is threading the strip, even if the speed of the coiler 5 increases, The sudden increase in tension on the steel strip will not cause the strip 200 between the mill 1 and the pinch roll 3 to be stretched and deformed due to tension. Since the strip 200 has been cooled after passing through the pinch roll 3, its temperature has decreased, so it will not be subjected to large deformation under the action of coiling tension. Thus, the present invention can reduce or even prevent the narrow-length defect of the strip 200 when it is threaded through the coiler 5, which is beneficial for subsequent cross-cutting, longitudinal cutting and forming of the strip 200, improving product quality and yield. Moreover, the structure is simple and can be automatically controlled.

[0046] The rolling mill 100 is suitable for low-carbon steel with a thickness ≤2.5mm and a width ≤1100mm. When preparing low-carbon steel of this specification, it can reduce or even avoid the problem of narrow strip head. The chemical composition of the low-carbon steel, by mass percentage, includes: C≤0.10%, Si≤0.04%, Mn≤0.3%, P≤0.025%, S≤0.015%, with the remainder being Fe and unavoidable impurities.

[0047] Understandably, the pinch roll 3 is in an open state before the strip 200 enters it, so that the strip 200 can pass through.

[0048] The cooling device 2 is preferably a laminar flow cooling device, which can improve the uniformity of cooling of the strip 200 and achieve rapid and efficient cooling.

[0049] The post-rolling coiling system also includes a guide roller 7 located between the idler roller 4 and the coiler 5 to facilitate guiding the strip 200 to turn towards the coiler 5.

[0050] In a preferred embodiment, the controller is further configured to:

[0051] Timing begins when the head of strip 200 passes the preset position. After time t1, the pinch roller 3 is released. Here, t1 = (L1 + L2) / v, L1 is the distance traveled by strip 200 from the preset position to the inlet of coiler 5 in meters, L2 is the preset winding length in meters, and v is the threading speed of strip 200 in meters per second.

[0052] In other words, after the head of the strip 200 enters the coiler 5 and is wound up to the preset winding length L2, the pinch roller 3 is controlled to release the strip 200. At this time, the coiler 5 has established and stabilized the threading tension, and the strip 200 can be wound up stably. At this time, controlling the pinch roller 3 to release the strip 200 can ensure that the strip 200 will not be stretched or deformed.

[0053] In this way, different times t1 can be set according to the distance between the inlet of the winding machine 5 and the idler roller 4 in the actual application, so that the control is more precise and can be applied to different application scenarios.

[0054] Since the strip 200 passes through the pinch roll 3 and the idler roll 4 after exiting the rolling mill 1, and then enters the coiler 5 for threading and coiling, and since both the pinch roll 3 and the idler roll 4 are driven rolls, the speed of the strip 200 after exiting the rolling mill 1 and entering the coiler 5 for threading remains approximately constant. Therefore, the threading linear speed of the strip 200 is basically the same as the speed of the strip 200 when exiting the rolling mill 1.

[0055] In another preferred embodiment, the post-rolling coiling system further includes a second position sensor and a set of auxiliary coiling rollers disposed around the coiler 5. The set of auxiliary coiling rollers includes a first auxiliary coiling roller 81 located at the entrance of the coiler 5. The second position sensor is used to detect whether the head of the strip 200 passes through the first auxiliary coiling roller 81.

[0056] The controller is connected to the second position sensor and is used for:

[0057] The signal detected by the second position sensor that the head of the strip 200 passes through the first auxiliary winding roller 81 is acquired, and timing is started.

[0058] After time t2, the pinch roller 3 is released, where t2 = L2 / v, L2 is the preset winding length, and v is the threading speed of the strip 200.

[0059] In this way, after the head of the strip 200 passes through the first auxiliary coiling roller 81 located at the entrance of the coiler 5, that is, after entering the coiler 5, the strip 200 is wound up to a preset auxiliary coiling length L2, and then the pinch roller 3 is controlled to release the strip 200. At this time, the coiler 5 has established and stabilized the threading tension, and the strip 200 can be wound up stably. At this time, controlling the pinch roller 3 to release the strip 200 can ensure that the strip 200 will not be stretched or deformed. This control method can determine whether the strip 200 has entered the coiler 5 through the second position sensor, regardless of which coiler 5 is used or the distance between the coiler 5 and the rolling mill 1, and use it as the timing start point. This avoids misjudgment when the strip 200 has not entered the coiler 5 and improves the control accuracy.

[0060] Preferably, a second position sensor is provided on each coiler 5 after the rolling mill 1 to improve the control accuracy of each coiler 5, so that the problem of narrow head of strip 200 can be prevented during coiling of each coiler 5.

[0061] Preferably, the second position sensor is a laser detector installed in the coiler 5. The laser detector can not only detect whether the head of the strip 200 has passed the first auxiliary winding roller 81, but also track the position of the head of the strip 200 after it enters the coiler 5, thereby detecting the auxiliary winding length of the strip 200. In this way, after the strip 200 has been wound to a preset auxiliary winding length L2, the laser detector can send a signal to the controller so that the controller can control the pinch roller 3 to release the strip 200.

[0062] Specifically, each coiler 5 also includes a second auxiliary coiling roller 82 and a third auxiliary coiling roller 83. The first auxiliary coiling roller 81, the second auxiliary coiling roller 82, and the third auxiliary coiling roller 83 are evenly distributed along the circumferential interval of the coiler 5. The position of the strip 200 head is tracked by a laser detector and a signal is transmitted to the controller. When the strip 200 head reaches the entrance of the coiler 5, the controller controls the first auxiliary coiling roller 81 to lift. After the strip 200 head passes the first auxiliary coiling roller 81, the controller controls the first auxiliary coiling roller 81 to drop and press the strip 200. 0; When the head of the strip 200 reaches the second auxiliary coiling roller 82, the controller controls the second auxiliary coiling roller 82 to lift up. After the head of the strip 200 passes the second auxiliary coiling roller 82, the controller controls the second auxiliary coiling roller 82 to fall down and press the strip 200. When the head of the strip 200 reaches the third auxiliary coiling roller 83, the controller controls the third auxiliary coiling roller 83 to lift up. After the head of the strip 200 passes the third auxiliary coiling roller 83, the controller controls the third auxiliary coiling roller 83 to fall down and press the strip 200. In this way, the head of the strip 200 is assisted in coiling to avoid loosening.

[0063] Preferably, the pinch roll 3 includes a pair of driven rolls arranged opposite each other, and the strip 200 passes through the pair of driven rolls. The pinch roll 3 can withstand a maximum temperature of 700°C, which can prevent the strip 200 from damaging the pinch roll 3 when it passes through it.

[0064] Preferably, the pinch roller 3 is made of alloy steel, and more preferably of 42CrMo4 alloy steel; the diameter of the pinch roller 3 is 500-800mm, so as to provide sufficient clamping force.

[0065] Furthermore, the post-rolling coiling system also includes side guide plates 9 on both sides of the idler roller 4. The side guide plates 9 can guide the conveying direction of the strip 200 and prevent the strip 200 from deviating or even deviating from the idler roller 4.

[0066] Preferably, the first position sensor 6 is located in the middle of the idler roller 4, so that the strip 200 can pass through the pinch roller 3 for a certain distance and then the pinch roller 3 clamps the strip 200, so as not to affect the clamping of the strip 200 by the pinch roller 3.

[0067] More preferably, the first position sensor 6 is disposed on the side guide plate 9 so as not to affect the operation of the strip 200 on the idler roller 4, or to prevent the first position sensor 6 from being damaged when the strip 200 is running on the idler roller 4.

[0068] Furthermore, the present invention also provides a method for coiling strip after rolling, which is performed based on the aforementioned rolling equipment 100. The method for coiling strip after rolling includes the following steps:

[0069] After the rolled strip 200 is cooled, it passes through the pinch roll 3. When the head of the strip 200 passes through the preset position on the support roller 4 located behind the pinch roll 3, the pinch roll 3 is controlled to clamp the strip 200.

[0070] The head of the strip 200 is fed into the coiler 5 for threading;

[0071] After the winding machine 5 establishes a stable threading tension, the pinch roller 3 is controlled to loosen.

[0072] Roll up.

[0073] In this way, after the strip 200 cools, it passes through the pinch roller 3. When the head of the strip 200 passes the preset position on the idler roller 4, the head of the strip 200 has already passed the pinch roller 3. At this time, controlling the pinch roller 3 to clamp the strip 200 can make the strip 200 have the same conveying speed as at the end of rolling under the action of the pinch roller 3. Furthermore, after establishing a stable threading tension, the pinch roller 3 is controlled to be released. In this way, when the coiler 5 threads the strip, even if the speed of the coiler 5 increases and the tension on the strip 200 suddenly increases, it will not cause the strip that has not passed through the pinch roller 3 to be stretched and deformed by tension. The strip 200 that has passed through the pinch roller 3 has been cooled and the temperature has decreased, so it will not cause large deformation under the action of coiling tension. Thus, the present invention can reduce or even prevent the narrow-length defect of the strip 200 when the coiler 5 threads the strip, which is beneficial to the subsequent cross-cutting, longitudinal cutting and forming processing of the strip 200, improving product quality and yield. Moreover, the structure is simple and can be automatically controlled.

[0074] Preferably, the chemical composition of the strip steel 200, by mass percentage, includes: C≤0.10%, Si≤0.04%, Mn≤0.3%, P≤0.025%, S≤0.015%, with the remainder being Fe and unavoidable impurities;

[0075] The thickness of the 200 strip is ≤2.5mm and the width is ≤1100mm.

[0076] In other words, this strip rolling and coiling method is suitable for low-carbon steel with a thickness of ≤2.5mm and a width of ≤1100mm. When preparing low-carbon steel of this specification, it can reduce or even avoid the problem of narrow strip head.

[0077] Understandably, the pinch roll 3 is in an open state before the strip 200 enters it, so that the strip 200 can pass through.

[0078] In a preferred embodiment, the step "after the winding machine 5 establishes a stable threading tension, control the pinch roller 3 to loosen" specifically includes:

[0079] Timing begins when the head of strip 200 passes the preset position. After time t1, the pinch roller 3 is released. Here, t1 = (L1 + L2) / v, L1 is the distance traveled by strip 200 from the preset position to the inlet of coiler 5, L2 is the preset winding length, and v is the threading speed of strip 200.

[0080] In other words, after the head of the strip 200 enters the coiler 5 and is wound up to the preset winding length L2, the pinch roller 3 is controlled to release the strip 200. At this time, the coiler 5 has established and stabilized the threading tension, and the strip 200 can be wound up stably. At this time, controlling the pinch roller 3 to release the strip 200 can ensure that the strip 200 will not be stretched or deformed.

[0081] In this way, different times t1 can be set according to the distance between the inlet of the winding machine 5 and the idler roller 4 in the actual application, so that the control is more precise and can be applied to different application scenarios.

[0082] In another preferred embodiment, the step "after the winding machine 5 establishes a stable threading tension, control the pinch roller 3 to loosen" specifically includes:

[0083] Timing begins when the head of strip 200 passes through the inlet of coiler 5. After time t2, the pinch roller 3 is released. Here, t2 = L2 / v, where L2 is the preset winding length and v is the threading speed of strip 200.

[0084] In this way, after the head of the strip 200 passes through the inlet of the coiler 5, and after the strip 200 is wound to a preset auxiliary winding length L2, the pinch roller 3 is controlled to release the strip 200. At this time, the coiler 5 has established and stabilized the threading tension, and the strip 200 can be wound stably. At this time, controlling the pinch roller 3 to release the strip 200 can ensure that the strip 200 will not be stretched or deformed. This control method can determine whether the strip 200 has entered the coiler 5, regardless of which coiler 5 is used or the distance between the coiler 5 and the rolling mill 1, and use this as the starting point for timing. This avoids misjudgment when the strip 200 has not entered the coiler 5, and improves the control accuracy.

[0085] The following description will elaborate on specific embodiments 1 to 3.

[0086] The chemical composition of the strip steel 200 of Examples 1 to 3 is shown in Table 1 by mass percentage. Apart from the elements shown in Table 1, the balance is Fe and unavoidable impurities. The thickness and width of the strip steel 200 are also shown in Table 1.

[0087] Table 1

[0088]

[0089] The temperatures of the strip 200 at the exit of the mill 1 (i.e., the final rolling temperature), at the pinch roll 3, and at the inlet of the coiler 5 (i.e., the coiling temperature) of the strip 200 in Examples 1 to 3 are shown in Table 2. The strip threading speed v (i.e., the speed at which the strip 200 exits the mill 1), the distance L1 that the strip 200 travels from the preset position to the inlet of the coiler 5, and the preset coiling length L2 are shown in Table 2.

[0090] Table 2

[0091]

[0092] After the strip 200 in Examples 1 to 3 was wound up, the head of the strip 200 was in good size and there was no narrow strip.

[0093] Compared with the prior art, the beneficial effects of the present invention are as follows: In the rolling equipment 100, strip coiling system, and strip coiling method of the present invention, since the pinch roll 3 is located after the cooling device 2 and the idler roll 4 is located after the pinch roll 3, when the first position sensor 6 located at the idler roll 4 detects that the head of the strip 200 has passed the preset position, it indicates that the head of the strip 200 has passed the pinch roll 3. At this time, controlling the pinch roll 3 to clamp the strip 200 allows the strip 200 to have the same conveying speed as when exiting the rolling mill 1 under the action of the pinch roll 3. Furthermore, after establishing a stable threading tension, the pinch roll 3 is controlled to loosen. In this way, when the coiler 5 is threading the strip, even if the speed of the coiler 5 increases and the tension on the strip suddenly increases, it will not cause the strip 200 between the mill 1 and the pinch roll 3 to be stretched and deformed due to tension. Since the strip 200 has been cooled after passing through the pinch roll 3, its temperature has decreased, so it will not cause large deformation under the action of coiling tension. Thus, the present invention can reduce or even prevent the narrow-length defect of the strip 200 when the coiler 5 is threading the strip, which is beneficial to the subsequent cross-cutting, longitudinal cutting and forming processing of the strip 200, improving product quality and yield. Moreover, the structure is simple and can be automatically controlled.

[0094] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A strip steel coiling system, comprising, from front to back, a cooling device, idler rollers, and a coiler located behind the rolling mill, characterized in that, The post-rolling winding system also includes, A pinch roller is disposed between the cooling device and the idler roller; A first position sensor is located at the idler roller and is used to detect whether the strip head has passed a preset position on the idler roller; The controller is connected to the pinch roller and the position sensor respectively, and is used for: When the signal detected by the first position sensor that the strip head has passed the preset position is obtained, timing is started and the pinch roller is controlled to clamp the strip. After time t1, the coiler establishes a stable threading tension and controls the pinch rollers to loosen. Here, t1 = (L1 + L2) / v, L1 is the distance the strip travels from the preset position to the coiler inlet, L2 is the preset winding length, and v is the threading linear speed of the strip.

2. The strip coiling system according to claim 1, characterized in that, The pinch rollers include a pair of driven rollers arranged opposite each other, and the maximum temperature that the pinch rollers can withstand is 700°C.

3. A rolling mill, characterized in that, The system includes the strip coiling system as described in claim 1 or 2, and also includes a rolling mill located in front of the coiling system.

4. A method for coiling strip steel after rolling, characterized in that, Including the following steps: After the rolled strip is cooled, it passes through the pinch rolls. When the head of the strip passes through the preset position on the idler roller behind the pinch rolls, the pinch rolls are controlled to clamp the strip. The strip head is fed into the coiler for threading; Timing begins when the strip head passes the preset position. After time t1, the coiler establishes a stable threading tension and controls the pinch roller to loosen. Here, t1 = (L1 + L2) / v, L1 is the distance the strip travels from the preset position to the coiler inlet, L2 is the preset winding length, and v is the threading linear speed of the strip. Roll up.

5. The strip coiling method according to claim 4, characterized in that, The chemical composition of the strip steel, by mass percentage, includes: C≤0.10%, Si≤0.04%, Mn≤0.3%, P≤0.025%, S≤0.015%, with the remainder being Fe and unavoidable impurities; The thickness of the strip is ≤2.5mm and the width is ≤1100mm.

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