Strip steel conveying device, method and strip steel rolling line

Abstract

The application discloses a strip conveying device, a strip conveying method and a strip rolling production line, which can be applied to conveying the strip output from an uncoiler to an inlet loop of a strip processing device, such as an acid pickling machine or a normalizing furnace. In the running process, when the strip is broken, the control mechanism controls the uncoiler and the first motor to stop at the same time, and the telescopic mechanism controls the clamping roller set to clamp the strip, so as to prevent the broken strip from being stacked in the inlet loop and to avoid the safety hidden danger caused by the broken strip being thrown out.

Description

Technical Field

[0001] This invention relates to strip steel processing The field of technology relates, in particular to a strip conveying device, method, and strip rolling production line. Background Technology

[0002] In the continuous strip rolling process, if a strip breaks and the machine cannot be stopped in time, the ends of the broken strip will be thrown out under force, posing a significant safety risk. It will also cause a large amount of strip steel to pile up in the production line, resulting in long-term shutdowns and affecting the unit's output. Summary of the Invention

[0003] In view of the above problems, this application is made in order to provide a strip conveying device, method, and strip rolling production line that overcomes or at least partially solves the above problems.

[0004] In a first aspect, a strip steel conveying device is provided. 1. A strip steel conveying device, characterized in that it includes an uncoiler, a conveying roller group, a clamping roller group, and a control mechanism, wherein the strip steel on the uncoiler is conveyed to the inlet looper of the strip steel rolling production line via the conveying roller group and the clamping roller group.

[0005] The conveyor roller assembly includes multiple spaced-apart drive rollers and a first motor. The output shaft of the first motor is connected to the drive rollers to drive the strip on the drive rollers.

[0006] The clamping roller assembly includes a tension roller, a pressure roller, and a telescopic mechanism; there is a gap between the pressure roller and the tension roller, and the telescopic mechanism is fixedly connected to the pressure roller to control the pressure roller to move closer to the tension roller during elongation, so as to clamp the strip steel passing through the gap;

[0007] The control mechanism is electrically connected to the uncoiler, the first motor, and the telescopic mechanism. It is used to obtain the actual tension output by the uncoiler. When the actual tension changes over time to the set fault condition, it controls the uncoiler and the first motor to stop running and controls the telescopic mechanism to extend.

[0008] Optional, also includes:

[0009] A strip deviation detection mechanism is used to detect the amount of deviation of the strip.

[0010] The deviation correction mechanism is used to correct the deviation of the strip during operation;

[0011] The control mechanism is electrically connected to the deviation detection mechanism and the deviation correction mechanism. It is used to receive the deviation amount of the strip steel sent by the deviation detection mechanism, determine the correction amount based on the deviation amount of the strip steel, and control the operation of the deviation correction mechanism based on the correction amount; and control the uncoiler and the first motor to stop running when the deviation amount of the strip steel exceeds the set threshold.

[0012] Optionally, the uncoiler includes a sleeve, a second motor, and a frequency converter. The output end of the second motor is connected to the sleeve drive to drive the sleeve to rotate.

[0013] The frequency converter is electrically connected to the second motor and the control mechanism. It is used to receive the target tension sent by the control mechanism; determine the target torque based on the target tension; control the operation of the second motor based on the target torque; and collect the actual torque output by the second motor.

[0014] Obtaining the actual tension output by the uncoiler specifically includes: the control mechanism receiving the actual torque output by the second motor sent by the frequency converter, and determining the actual tension output by the second motor based on the actual torque output by the second motor, which is then used as the actual tension output by the uncoiler.

[0015] Optionally, the control mechanism includes a first controller, which is electrically connected to the frequency converter, for receiving the actual torque output of the second motor sent by the frequency converter, determining the actual tension output by the uncoiler based on the actual torque output of the second motor, and determining the difference between the actual tension and the target tension;

[0016] The frequency converter is also used to receive the difference between the actual tension and the target tension sent by the first controller, and to control the operation of the second motor based on the difference between the actual tension and the target tension.

[0017] Optionally, the control mechanism also includes a second controller, which is electrically connected to the first controller, the telescopic mechanism, and the first motor respectively. The second controller is used to receive the actual tension output by the second motor sent by the first controller, and to send a stop signal to the first controller when the set fault condition is reached according to the change of the actual tension, and to control the first motor to stop running and control the telescopic mechanism to extend. The first controller controls the second motor to stop running according to the stop signal.

[0018] Optionally, the fault condition is set as follows: the actual tension output by the second motor drops to less than the set tension threshold, and the rate at which the actual tension output by the second motor drops is greater than or equal to the set rate threshold.

[0019] Optionally, the tension threshold can be set to be less than 5% of the target tension.

[0020] Optionally, the number of uncoilers is N, where N is a positive integer greater than or equal to 2. The strip conveying device also includes a welding machine, which is located on the side of the N uncoilers near the entrance looper.

[0021] In a second aspect, a strip conveying method is provided, applied to the strip conveying device of the first aspect, the method comprising:

[0022] When the strip steel on the uncoiler is sent to the inlet looper of the strip steel rolling production line through the conveyor roller group and the clamping roller group, the actual tension output by the uncoiler is obtained.

[0023] When the actual tension changes over time to reach the set fault condition, the unwinding machine and the first motor are stopped, and the telescopic mechanism is extended.

[0024] Thirdly, a strip rolling production line is provided, including a pickling machine, an inlet looper, and a strip conveying device as described in the first aspect, wherein the pickling machine is located on the side of the inlet looper away from the strip conveying device.

[0025] The technical solution provided in this application has at least the following technical effects or advantages:

[0026] The strip steel conveying device, method, and strip steel rolling production line provided in this application can be applied to convey strip steel output from an uncoiler to a strip steel processing device, such as the inlet looper of a pickling machine or normalizing furnace. During operation, when the strip steel breaks, the control mechanism promptly controls the uncoiler and the first motor to stop, while the telescopic mechanism controls the clamping roller group to clamp the strip steel to prevent the broken strip steel from piling up in the inlet looper and to avoid the broken strip steel from being thrown out and causing safety hazards.

[0027] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0029] Figure 1 The wire frame of the strip conveying device in the embodiments of this application Figure 1 ;

[0030] Figure 2 The wireframe of the strip processing device in the embodiments of this application Figure 2 ;

[0031] Figure 3 This is a schematic diagram of the deviation detection mechanism in the embodiments of this application;

[0032] Figure 4 This is a schematic diagram of the three-roller correction mechanism in an embodiment of this application;

[0033] Figure 5The wireframe of the strip processing device in the embodiments of this application Figure 3

[0034] Figure 6 This is a flowchart of the strip steel processing method in the embodiments of this application;

[0035] Figure 7 This is a wireframe diagram of the strip rolling production line in the embodiments of this application. Detailed Implementation

[0036] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings.

[0037] The accompanying drawings illustrate various structural schematics according to embodiments of this application. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0038] To better understand the above technical solutions, the following will describe the above technical solutions in detail with reference to specific implementation methods. It should be understood that the embodiments of this disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0039] If a strip breaks during continuous strip production and the machine cannot be stopped in time, the broken strip will be thrown out under force, posing a significant safety risk. It will also cause a large amount of strip to pile up in the production line, resulting in long-term shutdowns and affecting the unit's output.

[0040] Taking the normalizing and pickling unit for processing strip steel as an example, the normalizing and pickling unit is used for the normalizing and pickling of hot-rolled coils. The finished product is sent to the rolling mill for rolling, and at the same time, it completes the secondary normalizing of some steel grades. The normalizing and pickling unit is a continuous production mode. There are two uncoilers arranged in the inlet section. The strip steel on the two uncoilers goes through a series of operations such as alternating uncoiling, straightening, thickness measurement, centering, head and tail cutting, welding, and deviation correction before entering the normalizing and pickling unit through the inlet looper.

[0041] In continuous production, there are many quality defects at the head and tail of the strip, such as single-sided waves, middle waves, compound waves, visible edge cracks, and invisible edge cracks. The impact of these defects includes: the strip head and tail running off-center, the strip edge scraping against the equipment frame and causing strip breakage; the edge cracks at the head and tail of the strip are also prone to tearing or breaking when passing through the correction device.

[0042] After the strip breaks, the strip tail is thrown out under the tension of the inlet looper and enters the inlet looper, causing a large amount of strip steel to pile up. There are significant safety risks in the handling process, and it also causes long-term shutdowns that affect the unit's output.

[0043] In view of this, this application provides a strip conveying device that controls the drive mechanism to stop operating when the actual tension output by the drive mechanism changes over time beyond a set condition, thereby achieving timely shutdown in case of strip breakage. Simultaneously, it controls the telescopic mechanism to extend and clamp the strip, preventing it from being thrown out and causing a safety accident.

[0044] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be implemented independently or in combination with each other. The same or similar concepts or processes may not be described again in some embodiments.

[0045] Please refer to Figure 1 , Figure 1 This is a wireframe diagram of the strip conveying device in an embodiment of this application.

[0046] The strip steel conveying device 100 includes: an uncoiler 101, a conveying roller group 102, a clamping roller group 103, and a control mechanism 104. The strip steel on the uncoiler 101 is sent to the inlet looper 702 of the strip steel rolling production line via the conveying roller group 102 and the clamping roller group 103.

[0047] The conveyor roller group 102 includes a plurality of spaced-apart drive rollers 1021 and a first motor 1022. The output shaft of the first motor 1022 is connected to the drive rollers 1021 and is used to drive the strip on the drive rollers 1021 to run.

[0048] The clamping roller assembly 103 includes a tension roller 1031, a pressure roller 1032, and a telescopic mechanism 1033; there is a gap between the pressure roller 1032 and the tension roller 1031, and the telescopic mechanism 1033 is fixedly connected to the pressure roller 1032 for controlling the pressure roller 1032 to move closer to the tension roller 1031 when it is extended, so as to clamp the strip steel passing through the gap;

[0049] The control mechanism 104 is electrically connected to the uncoiler 101, the first motor 1022, and the telescopic mechanism 1033, respectively. It is used to obtain the actual tension output by the uncoiler 101. When the actual tension changes with time to reach the set fault condition, it controls the uncoiler 101 and the first motor 1022 to stop running and controls the telescopic mechanism 1033 to extend.

[0050] The strip conveying device 100 provided in this application embodiment can be used to convey strip steel. For example, it can be applied to convey the strip steel from the uncoiler 101 to the inlet looper 702 of the normalizing and pickling machine 701 group. The strip steel is stored in the inlet looper 702. When the strip steel breaks, the uncoiler 101 and the first motor 1022 stop, and the telescopic mechanism 1033 controls the clamping roller group 103 to clamp the strip steel to prevent the broken strip steel from piling up in the inlet looper 702 and to avoid the broken strip steel from being thrown out and causing safety hazards.

[0051] Below, in conjunction with Figures 2-5 The strip conveying device 100 provided in the embodiments of this application will be described in detail. This example does not constitute a limitation on the embodiments of this application. The following embodiments can be combined with each other, and the same or similar concepts or processes will not be described again.

[0052] In some alternative implementations, such as Figure 2 As shown, the strip conveying device 100 provided in this application embodiment further includes: a deviation detection mechanism 201, used to detect the deviation of the strip;

[0053] The correction mechanism 202 is used to correct the deviation of the strip during operation;

[0054] The control mechanism 104 is electrically connected to the deviation detection mechanism 201 and the deviation correction mechanism 202. It is used to receive the deviation amount of the strip sent by the deviation detection mechanism 201, determine the deviation correction amount based on the deviation amount of the strip, and control the operation of the deviation correction mechanism 202 based on the deviation correction amount; and control the uncoiler 101 and the first motor 1022 to stop running when the deviation amount of the strip exceeds the set threshold.

[0055] During operation, the strip steel may deviate from its designated path. The correction mechanism 202 can correct the deviation of the strip steel within a certain range. However, if the strip steel continues to deviate due to factors such as plate shape, and the degree of deviation exceeds the capability of the correction mechanism 202, the strip steel will quickly deviate until it scrapes and breaks. Therefore, by controlling the mechanism 104, when the deviation of the strip steel exceeds the set threshold, the drive mechanism is controlled to stop operating. By quickly stopping the strip steel after it deviates severely and the correction mechanism 202 loses its correction capability, the strip steel breakage is avoided.

[0056] The misalignment detection mechanism 201 and the misalignment correction mechanism 202 can adopt a CPC misalignment system, such as Figure 3 As shown, in order to detect the center position of the metal strip, the deviation detection mechanism 201 includes two pairs of sensors 301. The two pairs of sensors 301 are respectively installed on the working side and the transmission side of the strip 203, and are used to detect the deviation of the strip 203 on the working side and the transmission side, respectively. The two pairs of sensors 301 are installed in positions symmetrical to the center of the same unit.

[0057] Each pair of sensors 301 includes a transmitter, a receiver, and a coil. There are magnetic field lines between the transmitter and the receiver, and each pair of coils is itself a directional air-core transformer. As the strip passes through the gap between the transmitter and the receiver, it cuts the magnetic field lines. When the strip deviates, a difference in magnetic flux is generated between the connected coils. This difference is processed by the control mechanism 104 and output as a measurement result as the deviation amount.

[0058] The correction mechanism 202 can be a three-roller correction device, such as... Figure 4 As shown, the machine includes a frame 401, two support rollers 402, and an upper pressure roller 403. The two support rollers 402 are mounted parallel to each other on the frame 401, and the upper pressure roller 403 is located above the two support rollers 402. The two ends of the upper pressure roller 403 are connected to the frame 401 through hydraulic cylinders. The running strip passes through the gap between the two support rollers 402 and the upper pressure roller 403. The control mechanism 104 is electrically connected to the hydraulic system of the hydraulic cylinder. By controlling the hydraulic cylinder, the upper pressure roller 403 is driven to descend so that a certain angle is formed between the strip and the roller surface so that the strip moves laterally to achieve strip correction.

[0059] The control mechanism 104 receives the strip misalignment signal fed back from the detection device, and outputs the result through an internal control algorithm to control the proportional valve output, thereby controlling the action of the hydraulic cylinder. The actual position of the hydraulic cylinder is detected by the linear displacement sensor 301 and fed back to the controller to form a closed-loop control.

[0060] The correction mechanism 202 can correct the strip within the stroke range of the hydraulic cylinder. If the strip continues to deviate due to factors such as the strip shape, the hydraulic cylinder will be unable to provide correction capability after reaching its full stroke. At this time, the strip will quickly deviate until it breaks at the edge. The control mechanism 104 determines that the strip deviation exceeds the set threshold based on the signal sent by the deviation detection mechanism 201. This indicates that the strip deviation exceeds the correction capability of the correction mechanism 202, and the drive mechanism is promptly controlled to stop operation to stop the strip from running and prevent the strip from breaking after continuous deviation.

[0061] In one possible implementation, such as Figure 5 As shown, the uncoiler includes a sleeve 501, a second motor 502, and a frequency converter 503. The output end of the second motor 502 is connected to the sleeve 501 for driving the sleeve 501 to rotate.

[0062] The frequency converter 503 is electrically connected to the second motor 502 and the control mechanism 104. It is used to receive the target tension sent by the control mechanism 104; determine the target torque based on the target tension; control the operation of the second motor 502 based on the target torque; and collect the actual torque output by the second motor 502.

[0063] Obtaining the actual tension output by the uncoiler 101 specifically includes: the control mechanism 104 receiving the actual torque output by the second motor 502 sent by the frequency converter 503, and determining the actual tension output by the second motor 502 based on the actual torque output by the second motor 502, which is then used as the actual tension output by the uncoiler 101.

[0064] In one possible implementation, it remains as follows Figure 5 As shown, the control mechanism 104 includes a first controller 504, which is electrically connected to a frequency converter 503. The first controller 504 receives the actual torque output of the second motor 502 from the frequency converter 503, determines the actual tension output by the uncoiler 101 based on the actual torque output of the second motor 502, and determines the difference between the actual tension and the target tension. The frequency converter 503 also receives the difference between the actual tension and the target tension from the first controller 504, and controls the operation of the second motor 502 based on this difference. The first controller 504 controls the operation of the second motor 502 through the frequency converter 503.

[0065] The control mechanism 104 also includes a second controller 505, which is electrically connected to the first controller 504, the telescopic mechanism 1033, and the first motor 1022. The second controller 505 is used to receive the actual tension output by the second motor 502 sent by the first controller 504, and to send a stop signal to the first controller 504 when the set fault condition is reached according to the change of actual tension, and to control the first motor 1022 to stop running and control the telescopic mechanism 1033 to extend. The first controller 504 controls the second motor 502 to stop running according to the stop signal.

[0066] The first controller 504 is a drive controller, and the second controller 505 is a PLC controller within the PLC control system. The drive controller receives the tension setpoint (i.e., target tension) from the PLC control system via a communication link and sends the tension setpoint to the frequency converter 503. The frequency converter 503 detects changes in the torque of the second motor 502 and converts it into actual tension using an internal algorithm. The drive controller compares the deviation between the tension setpoint and the actual tension and adjusts the output of the frequency converter 503 to control the torque change of the second motor 502, ensuring that the actual tension follows the target tension.

[0067] Still Figure 5As shown, the second controller 505 is also electrically connected to the deviation detection mechanism 201 and the correction mechanism 202. It is used to receive the deviation amount of the strip sent by the deviation detection mechanism 201, determine the correction amount based on the deviation amount of the strip, and control the operation of the correction mechanism 202 based on the correction amount. When the deviation amount of the strip exceeds the set threshold, it controls the first motor 1022 and the second motor 502 to stop running, so as to control the conveyor roller group 102 and the uncoiler 101 to stop running, thereby stopping the strip conveying device 100.

[0068] In some optional implementations, the fault condition is set as follows: the actual tension output by the second motor 502 decreases to less than a set tension threshold, and the rate of decrease of the actual tension output by the second motor 502 is greater than or equal to a set rate threshold. For example, the set tension threshold is less than 5% of the target tension.

[0069] Under normal circumstances, the actual tension changes very little and not too fast. However, when the belt breaks, the actual tension output by the second motor 502 drops sharply. The PLC automation system receives the actual tension processed by the transmission control system, combines it with the operating status of the inlet section, and judges the belt breakage situation by comparing the rate of change of the deviation between the set tension and the actual tension of the uncoiler 101 within a certain time interval through internal logic. At the moment the belt breakage is determined, the inlet belt breakage signal, i.e., the stop signal, is triggered.

[0070] In some alternative implementations, the number of uncoilers 101 is N, where N is a positive integer greater than or equal to 2, and the strip conveying device 100 also includes a welding machine, which is located on the side of the N uncoilers 101 near the inlet looper 702.

[0071] Two uncoilers 101 are set at intervals and uncoil alternately. The tail of the previous strip and the head of the next strip are welded by a welding machine to ensure that the strip is continuously fed to the inlet looper 702 of the strip rolling production line and to ensure continuous production.

[0072] Based on the same inventive concept, this application also provides a strip conveying method, please refer to... Figure 6 , Figure 6 This is a flowchart of a strip conveying method in an embodiment of this application. The strip conveying method includes:

[0073] S601. When the strip on the uncoiler is sent to the inlet looper 702 of the strip rolling production line via the conveyor roller group and the clamping roller group, the actual tension output by the uncoiler is obtained.

[0074] S602. When the actual tension changes over time to reach the set fault condition, control the uncoiler and the first motor to stop running and control the telescopic mechanism to extend.

[0075] The strip conveying method provided in this application embodiment can be applied to convey the strip from the uncoiler 101 to the inlet looper 702 of the normalizing and pickling machine 701 group. The strip is stored in the inlet looper 702. When the strip breaks, the uncoiler 101 and the first motor 1022 stop, and the telescopic mechanism 1033 controls the clamping roller group 103 to clamp the strip to prevent the broken strip from piling up in the inlet looper 702 and to avoid the broken strip from being thrown out and causing safety hazards.

[0076] Based on the same inventive concept, this application also provides a strip steel rolling production line, please refer to... Figure 7 , Figure 7 The following is a line diagram of a strip rolling production line in this application embodiment. The strip rolling production line 700 includes: a pickling machine 701, an inlet looper 702, and a strip conveying device 100 provided in the above embodiment. The pickling machine 701 is located on the side of the inlet looper 702 away from the strip conveying device 100. The strip on the uncoiler 101 is sent to the inlet looper 702 of the strip rolling production line via the conveying roller group 102 and the clamping roller group 103. The strip sent out by the inlet looper 702 enters the pickling machine 701 for pickling.

[0077] The strip rolling production line 700 can be a pickling and normalizing production line. A normalizing machine is also set on the side of the pickling machine 701 away from the inlet looper 702. The strip steel output from the pickling machine 701 enters the normalizing machine for normalizing. During the pickling and normalizing of the strip steel, the control mechanism 104 obtains the actual tension output by the uncoiler 101. When the change of the actual tension over time reaches the set fault condition, the control mechanism 104 stops the operation of the uncoiler 101 and the first motor 1022 and controls the extension mechanism 1033 to extend.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0079] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

Claims

1. A strip steel conveying device, characterized in that, It includes an uncoiler, a conveyor roller group, a clamping roller group, and a control mechanism. The strip steel on the uncoiler is fed to the inlet looper of the strip steel rolling production line through the conveyor roller group and the clamping roller group. The conveyor roller group includes multiple spaced-apart drive rollers and a first motor. The output shaft of the first motor is connected to the drive rollers and is used to drive the strip on the drive rollers to run. The clamping roller assembly includes a tension roller, a pressure roller, and a telescopic mechanism; there is a gap between the pressure roller and the tension roller, and the telescopic mechanism is fixedly connected to the pressure roller, used to control the pressure roller to move closer to the tension roller when it is extended, so as to clamp the strip steel passing through the gap; The control mechanism is electrically connected to the uncoiler, the first motor, and the telescopic mechanism, respectively, and is used to obtain the actual tension output by the uncoiler. When the actual tension changes over time to reach a set fault condition, the control mechanism controls the uncoiler and the first motor to stop running and controls the telescopic mechanism to extend.

2. The strip conveying device as described in claim 1, characterized in that, Also includes: A deviation detection mechanism is used to detect the deviation of the strip steel. A deviation correction mechanism is used to correct the deviation of the strip during operation; The control mechanism is electrically connected to the deviation detection mechanism and the deviation correction mechanism, and is used to receive the deviation amount of the strip steel sent by the deviation detection mechanism, determine the deviation correction amount based on the deviation amount of the strip steel, and control the operation of the deviation correction mechanism based on the deviation correction amount; and control the uncoiler and the first motor to stop operating when the deviation amount of the strip steel exceeds a set threshold.

3. The strip conveying device as described in claim 1, characterized in that, The uncoiler includes a sleeve, a second motor, and a frequency converter. The output end of the second motor is connected to the sleeve for driving the sleeve to rotate. The frequency converter is electrically connected to the second motor and the control mechanism, and is used to receive the target tension sent by the control mechanism; determine the target torque based on the target tension; control the operation of the second motor based on the target torque; and collect the actual torque output by the second motor. The process of obtaining the actual tension output by the uncoiler specifically includes: the control mechanism receiving the actual torque output by the second motor sent by the frequency converter, and determining the actual tension output by the second motor based on the actual torque output by the second motor, which is then used as the actual tension output by the uncoiler.

4. The strip conveying device as described in claim 3, characterized in that, The control mechanism includes a first controller, which is electrically connected to the frequency converter. The first controller is used to receive the actual torque output by the second motor sent by the frequency converter, determine the actual tension output by the uncoiler based on the actual torque output by the second motor, and determine the difference between the actual tension and the target tension. The frequency converter is also used to receive the difference between the actual tension and the target tension sent by the first controller, and to control the second motor to run based on the difference between the actual tension and the target tension.

5. The strip conveying device as described in claim 4, characterized in that, The control mechanism further includes a second controller, which is electrically connected to the first controller, the telescopic mechanism, and the first motor, respectively. The second controller is used to receive the actual tension output by the second motor from the first controller, and to send a stop signal to the first controller when a set fault condition is reached based on the change in the actual tension, and to control the first motor to stop running and control the telescopic mechanism to extend. The first controller controls the second motor to stop running based on the stop signal.

6. The strip conveying device as described in claim 5, characterized in that, The set fault condition is: the actual tension output by the second motor drops to less than the set tension threshold, and the rate at which the actual tension output by the second motor drops is greater than or equal to the set rate threshold.

7. The strip conveying device as described in claim 6, characterized in that, The set tension threshold is less than 5% of the target tension.

8. The strip conveying device as described in claim 1, characterized in that, The number of uncoilers is N, where N is a positive integer greater than or equal to 2. The strip conveying device also includes a welding machine, which is located on the side of the N uncoilers near the inlet looper.

9. A method for conveying strip steel, characterized in that, Applied to the strip conveying device according to any one of claims 1 to 8, the method comprises: When the strip steel on the uncoiler is sent to the inlet looper of the strip steel rolling production line through the conveying roller group and the clamping roller group, the actual tension output by the uncoiler is obtained. When the actual tension changes over time to reach the set fault condition, the unwinding machine and the first motor are controlled to stop running, and the telescopic mechanism is controlled to extend.

10. A strip steel rolling production line, characterized in that, It includes a pickling machine, an inlet looper, and a strip conveying device as described in any one of claims 1 to 8, wherein the pickling machine is located on the side of the inlet looper away from the strip conveying device.

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