Hot continuous rolling steel coil finish rolling outlet constant tension transmission device and control method

Abstract

The invention relates to the technical field of hot rolling coil production and manufacturing, in particular to a hot continuous rolling steel coil finish rolling outlet constant tension transmission device and a control method. The two sets of circulating constant tension mechanisms are symmetrically arranged on the two sides of the strip steel conveying roller between the outlet of the finishing mill unit and the coiling unit, and the multiple sets of electric clamping jaws installed on the circulating conveying belt at equal intervals are combined to provide stable tension for strip steel in turn, so that the conditions of wave shapes, thickness fluctuation, steel strip stacking and the like of steel coils can be effectively avoided; the product quality of hot continuous rolling of the steel strip can be greatly improved, and the production safety risk is reduced; through reasonable clamping control logic of a plurality of groups of electric clamping jaws, the running stability of the device can be further improved, so that a hot-rolled coil always keeps a certain constant tension from a finish rolling outlet to a coiling process; the whole structure is compact, installation and arrangement are convenient, the electric clamping jaw can be adjusted in a telescopic mode, the device can be suitable for production of strip steel of various different widths, practicability is high, and popularization is easy.

Description

Technical Field

[0001] The present invention relates to the technical field of hot-rolled coil production and manufacturing, and particularly relates to a constant-tension transmission device and control method for the finishing mill outlet of a hot continuous rolling steel coil. Background Art

[0002] During the process from the outlet of the finishing mill to coiling of a traditional hot continuous rolling steel coil (about 150 meters), both the leading end and the trailing end of the steel coil are in a tension-free state. After leaving the outlet of the finishing mill, it is transmitted in a wavy shape. At the moment when the coiler clamps the leading end, due to the sudden application of tension to the steel coil, its thickness will fluctuate; after the trailing end leaves the outlet of the finishing mill, due to the loss of tension of the steel coil, it will cause the steel coil to be transmitted in a flying strip manner, easily resulting in stacking of steel coils, and the thickness of the steel coil will also suddenly fluctuate at the moment of tension loss. The leading end and the trailing end together affect about 300 meters (accounting for about 37% of the entire steel coil). This phenomenon not only affects the coiling effect, causing the whole coil to have a tower shape, uneven coiling, etc., but also when the stacking of steel coils is relatively serious, it even requires stopping the machine to manually remove the coil, wasting production efficiency and posing certain risks to production personnel and equipment.

[0003] Currently, in the prior art, devices such as pinch rolls are usually used in the hot rolling stage to improve the coiling shape, but they can only restrain the waviness generated by the hot-rolled coil within a certain range, and cannot provide a stable and constant tension to the hot-rolled coil during the production process, making it difficult to ensure the smooth and stable operation of the hot-rolled coil during production. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide a constant-tension transmission device and control method for the finishing mill outlet of a hot continuous rolling steel coil, which can enable the hot-rolled coil to always maintain a certain constant tension during the process from the finishing mill outlet to coiling, thereby effectively avoiding situations such as waviness, thickness fluctuation, and steel strip stacking of the steel coil, significantly improving the product quality of hot strip continuous rolling, and reducing production safety risks.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is:

[0006] I. A constant-tension transmission device for the finishing mill outlet of a hot continuous rolling steel coil

[0007] The present invention provides a constant-tension transmission device for the finishing mill outlet of a hot continuous rolling steel coil, mainly including: two sets of circulating constant-tension mechanisms 1 respectively symmetrically installed on both sides of the conveyor roller 4 between the outlet end of the finishing mill unit 2 and the inlet end of the coiling unit 3 of the hot continuous rolling steel coil production line;

[0008] The circulating constant-tension mechanism 1 includes a circulating conveyor belt 6 arranged in parallel on the side of the strip steel 5. Both ends of the circulating conveyor belt 6 are respectively wound around a driving shaft 8 and a driven shaft 9, and the driving shaft 8 is connected with a circulating driving motor 7;

[0009] At a height on the outer surface of the circulating conveyor belt 6 that is flush with the strip steel 5, a plurality of groups of telescopically adjustable electric grippers 10 are evenly installed at preset intervals. The electric grippers 10 are used to grip the traction strip steel 5 and provide a stable constant tension for it.

[0010] Preferably, the electric gripper 10 includes two jaws 11 installed at one end of an electric drive gripping actuator 12, and the other end of the electric drive gripping actuator 12 is connected to a mounting seat 14 through a telescopic adjustment mechanism 13. The electric gripper 10 is fixedly installed on the outer surface of the circulating conveyor belt 6 through the mounting seat 14.

[0011] Preferably, by adjusting the telescopic adjustment mechanism 13, the distance between the electric grippers 10 of the circulating constant tension mechanism 1 on both sides of the conveyor roller 4 is adapted to the width of the strip steel 5.

[0012] Preferably, a protective sleeve 15 for preventing damage to the strip steel is sleeved on the gripping end of the jaw 11, and a photoelectric sensor 16 is installed on the bottom surface of the electric drive gripping actuator 12.

[0013] Preferably, the electric drive gripping actuator 12 includes sliders fixedly connected to the two jaws 11 respectively. The two sliders are both slidably installed on the slide rail and are driven by a gripping motor to move along the slide rail to achieve the gripping and releasing actions.

[0014] Preferably, the contactor terminal for switching the rotation direction of the motor in the gripping motor is electrically connected to the signal output end of the photoelectric sensor 16.

[0015] Preferably, the drive shaft 8 is arranged at one end of the circulating constant tension mechanism 1 close to the finishing mill unit 2, the driven shaft 9 is arranged at one end of the circulating constant tension mechanism 1 close to the coiling unit 3, and the rotational speed of the circulating drive motor 7 is matched with the rotational speed of the conveyor roller 4;

[0016] When the circulating drive motor 7 is started, the drive shaft 8 will actively rotate to drive the circulating conveyor belt 6 to rotate cyclically along the strip steel conveying direction, so that the electric grippers 10 grip the strip steel 5 and provide forward tension for it;

[0017] When the circulating drive motor 7 stops, the circulating conveyor belt 6 will be driven by the electric grippers 10 gripping the strip steel 5 to continue rotating along the strip steel conveying direction. At the same time, the drive shaft 8 will be driven to rotate passively by the circulating conveyor belt 6, and the drive shaft 8 is provided with passive rotation damping so that the strip steel 5 is subjected to backward tension.

[0018] Preferably, a finishing mill end reflector 17 adapted to the photoelectric sensor 16 is installed on the upper surface of the conveyor roller shaft corresponding to the drive shaft 8 at the outlet end of the finishing mill unit 2;

[0019] On the upper surface of the conveying roller shaft corresponding to the position at the inlet end of the coiling unit 3 and opposite to the driven shaft 9, a coiling machine end reflector 18 adapted to the photoelectric sensor 16 is installed.

[0020] II. A control method for a constant-tension transmission device at the finish rolling outlet of a hot continuous rolling steel coil

[0021] Based on the same inventive concept, the present invention also provides a control method for the constant-tension transmission device at the finish rolling outlet of the hot continuous rolling steel coil as described above, which mainly includes the following steps:

[0022] Step S1, adjustment of the telescopic length of the electric gripper: Adjust the length of the electric grippers 10 on both sides of the circulating constant-tension mechanism 1 through the telescopic adjustment mechanism 13 so that the distance between the electric grippers 10 on both sides is adapted to the width of the strip steel 5;

[0023] Step S2, start of the circulating constant-tension mechanism: Start the circulating drive motor 7 of the circulating constant-tension mechanisms 1 on both sides, so that the circulating conveyor belt 6 drives the multiple groups of electric grippers 10 thereon to rotate in a cycle along the strip steel conveying direction, and control the rotation speed of the circulating drive motor 7 to match the rotation speed of the conveying roller 4;

[0024] Step S3, automatic clamping control of the electric gripper: When the nth group of electric grippers 10 on both sides runs directly above the finish rolling mill end reflector 17, it will trigger the photoelectric sensor 16, causing the clamping motor to rotate forward to drive the chuck 11 to perform a clamping action to clamp the strip steel 5 and provide tension for it;

[0025] Step S4, automatic release control of the electric gripper: When the nth group of electric grippers 10 on both sides runs directly above the coiling machine end reflector 18, it will trigger the photoelectric sensor 16 again, causing the clamping motor to rotate in reverse to drive the chuck 11 to perform a release action to release the strip steel 5;

[0026] Among them, n = 1, 2, 3, 4,...;

[0027] Step S5, automatic shutdown control of the circulating constant-tension mechanism: When the sensing device in the coiling unit 3 detects that the head of the strip steel 5 has entered the coiling unit 3, control the circulating drive motor 7 to automatically shut down, so that the circulating conveyor belt 6 continues to rotate along the strip steel conveying direction under the drive of the electric grippers 10 clamping the strip steel 5. At the same time, the drive shaft 8 will be driven to rotate passively under the drive of the circulating conveyor belt 6, and through the passive rotation damping of the drive shaft 8, the strip steel 5 is subjected to a reverse tensile force;

[0028] Step S6, repeatedly execute steps S3 to S4 until all the hot-rolled coils on the current production line are completely coiled.

[0029] Among them, the rotational speed W of the cyclic drive motor 7 is calculated and determined according to the arrangement pitch D of the multiple groups of electric grippers 10 and the strip transmission distance L between the outlet end of the finishing mill unit 2 and the inlet end of the coiling unit 3, specifically as follows:

[0030] W = C × W0 × L / D

[0031] In the formula, W0 is the default operating rotational speed of the cyclic drive motor 7, which is determined through production experience; C is the mechanical error correction coefficient.

[0032] The present invention has the following main advantages compared with the prior art:

[0033] 1. A constant-tension transmission device for the finishing mill outlet of hot-rolled steel coils provided by the present invention symmetrically arranges two sets of cyclic constant-tension mechanisms on both sides of the strip conveyor rollers between the outlet of the finishing mill unit and the inlet of the coiling unit. By combining multiple groups of electric grippers installed at equal intervals on the cyclic conveyor belt to alternately provide stable tension for the strip, it can effectively avoid situations such as the steel coil having waviness, thickness fluctuations, and strip stacking, significantly improve the product quality of strip hot rolling, and reduce the production safety risk;

[0034] 2. The control method of the constant-tension transmission device provided by the present invention can further improve the operation stability of the device through the reasonable gripping control logic of multiple groups of electric grippers, enabling the hot-rolled coil to always maintain a certain constant tension during the process from the finishing mill outlet to coiling, ensuring the stable transmission of the hot-rolled coil during production, and significantly improving the production efficiency;

[0035] 3. The overall structure of the present invention is compact, easy to install and arrange, and the electric grippers can be telescopically adjusted, capable of being applicable to the production of strip steel with various different widths, with strong practicability and easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a plan view of the constant-tension transmission device for the finishing mill outlet of hot-rolled steel coils in an embodiment of the present invention;

[0037] Figure 2 is a side view of the constant-tension transmission device for the finishing mill outlet of hot-rolled steel coils in an embodiment of the present invention;

[0038] Figure 3 is a schematic view of a single electric gripper in an embodiment of the present invention;

[0039] Figure 4 is a flowchart of the control method in an embodiment of the present invention.

[0040] In the figure: 1 - Circulating constant tension mechanism; 2 - Finish rolling mill unit; 3 - Coiling unit; 4 - Conveyor roller; 5 - Strip steel; 6 - Circulating conveyor belt; 7 - Circulating drive motor; 8 - Drive shaft; 9 - Driven shaft; 10 - Electric gripper; 11 - Chuck; 12 - Electric drive gripping actuator; 13 - Telescopic adjustment mechanism; 14 - Mounting seat; 15 - Anti - pinching protection sleeve; 16 - Photoelectric sensor; 17 - Reflector plate at the finish rolling mill end; 18 - Reflector plate at the coiling mill end. Detailed implementation mode

[0041] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] It should be noted that according to the needs of implementation, each step / component described in this application can be split into more steps / components, or two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the objectives of the present invention.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0044] Embodiment 1. This embodiment provides a constant - tension transmission device for the finish rolling exit of hot - continuous - rolled steel coils, which is mainly applied to the transmission stage at the finish rolling exit of the continuous casting billet hot - continuous - rolling in a steel plant. As Figures 1 - 2 shown, it mainly includes: two sets of circulating constant - tension mechanisms 1 symmetrically installed on both sides of the conveyor roller 4 between the exit end of the finish rolling mill unit 2 and the entrance end of the coiling unit 3 of the hot - continuous - rolled steel coil production line;

[0045] Among them, the circulating constant - tension mechanism 1 includes a circulating conveyor belt 6 arranged in parallel on the side of the strip steel 5. Both ends of the circulating conveyor belt 6 are respectively wound around the drive shaft 8 and the driven shaft 9, and the drive shaft 8 is connected with a circulating drive motor 7;

[0046] On the outer surface of the circulating conveyor belt 6 at a height flush with the strip steel 5, multiple groups of telescopically adjustable electric grippers 10 are evenly installed at preset intervals. The electric grippers 10 are used to grip and pull the strip steel 5 and provide a stable constant tension for it.

[0047] In this embodiment, the total length of the circulating conveyor belt 6 is about 300 m, and the unilateral length of the circulating constant-tension mechanism 1 is about 150 m, which is adapted to the strip transmission distance between the outlet end of the finishing mill unit 2 and the inlet end of the coiling unit 3.

[0048] In this embodiment, there are four groups of electric grippers 10 in total, and each group of electric grippers is fixedly installed on the plane flush with the strip 5 on the outer ring of the circulating conveyor belt 6 at an interval of about 75 m.

[0049] As Figure 3 shown, the electric gripper 10 includes two jaws 11 installed at one end of the electric drive gripping actuator 12, and the other end of the electric drive gripping actuator 12 is connected to the mounting seat 14 through the telescopic adjustment mechanism 13, and the electric gripper 10 is fixedly installed on the outer surface of the circulating conveyor belt 6 through the mounting seat 14.

[0050] Furthermore, by adjusting the telescopic adjustment mechanism 13, the distance between the electric grippers 10 of the circulating constant-tension mechanism 1 on both sides of the conveyor roller 4 is adapted to the width of the strip 5.

[0051] Furthermore, a protective sleeve 15 for preventing the strip from being scratched is sleeved on the gripping end of the jaw 11, and a photoelectric sensor 16 is installed on the bottom surface of the electric drive gripping actuator 12.

[0052] Furthermore, the electric drive gripping actuator 12 includes sliders fixedly connected to the two jaws 11 respectively. The two sliders are both slidably installed on the slide rail and are driven by the gripping motor to move along the slide rail to realize the gripping and releasing actions.

[0053] Furthermore, the contactor terminal for switching the rotation direction of the motor in the gripping motor is electrically connected to the signal output end of the photoelectric sensor 16. When the gripping motor receives the induction signal of the photoelectric sensor 16, the rotation direction of the motor is switched to switch the clamping and releasing actions of the electric gripper.

[0054] Furthermore, the drive shaft 8 is arranged at one end of the circulating constant-tension mechanism 1 close to the finishing mill unit 2, the driven shaft 9 is arranged at one end of the circulating constant-tension mechanism 1 close to the coiling unit 3, and the rotation speed of the circulating drive motor 7 matches the rotation speed of the conveyor roller 4;

[0055] When the circulating drive motor 7 is started, the drive shaft 8 will actively rotate to drive the circulating conveyor belt 6 to rotate in a cycle along the strip conveying direction, so that the electric gripper 10 clamps the strip 5 and provides forward tension for it;

[0056] When the circulating drive motor 7 stops, the circulating conveyor belt 6 will be driven by the electric grippers 10 clamping the strip steel 5 to continue rotating along the strip steel conveying direction. At the same time, the drive shaft 8 will be driven to rotate passively by the circulating conveyor belt 6, and the drive shaft 8 is provided with passive rotation damping so that the strip steel 5 is subjected to a backward tension.

[0057] In this embodiment, the circulating drive motor 7 specifically adopts a variable-frequency drive motor to ensure precise control of the rotation speed.

[0058] Furthermore, on the upper surface of the conveyor roller shaft corresponding to the drive shaft 8 at the outlet end of the finishing mill unit 2, a finishing mill end reflector 17 adapted to the photoelectric sensor 16 is installed;

[0059] On the upper surface of the conveyor roller shaft corresponding to the driven shaft 9 at the inlet end of the coiling unit 3, a coiling machine end reflector 18 adapted to the photoelectric sensor 16 is installed.

[0060] Embodiment 2, based on the same inventive concept, this embodiment also provides a control method for a hot continuous rolling steel coil finishing mill outlet constant tension transmission device as described above, which can further improve the stability of the device operation, so that the hot rolled coil always maintains a certain constant tension during the process from the finishing mill outlet to coiling, and ensures the smooth operation of the hot rolled coil during production;

[0061] As Figure 4 shown, it mainly includes the following steps:

[0062] Step S1, adjustment of the telescopic length of the electric grippers: Adjust the length of the electric grippers 10 on both sides of the circulating constant tension mechanism 1 through the telescopic adjustment mechanism 13 so that the distance between the electric grippers 10 on both sides is adapted to the width of the strip steel 5;

[0063] Step S2, starting of the circulating constant tension mechanism: Start the circulating drive motors 7 of the circulating constant tension mechanisms 1 on both sides, so that the circulating conveyor belt 6 drives multiple groups of electric grippers 10 thereon to rotate in a cycle along the strip steel conveying direction, and control the rotation speed of the circulating drive motor 7 to match the rotation speed of the conveyor roller 4;

[0064] Step S3, automatic clamping control of the electric grippers: When the nth group of electric grippers 10 on both sides runs directly above the finishing mill end reflector 17, it will trigger the photoelectric sensor 16, causing the clamping motor to rotate forward to drive the chuck 11 to perform a clamping action to clamp the strip steel 5 and provide tension for it;

[0065] Step S4, automatic release control of the electric grippers: When the nth group of electric grippers 10 on both sides runs directly above the coiling machine end reflector 18, it will trigger the photoelectric sensor 16 again, causing the clamping motor to rotate in reverse to drive the chuck 11 to perform a release action to release the strip steel 5;

[0066] where n = 1, 2, 3, 4, ……;

[0067] Step S5, automatic shutdown control of the cyclic constant tension mechanism: When the sensing device in the coiling unit 3 detects that the head of the strip 5 has entered the coiling unit 3, control the cyclic drive motor 7 to automatically shut down, so that the cyclic conveyor belt 6 continues to rotate along the strip conveying direction driven by the electric gripper 10 clamping the strip 5. At the same time, the drive shaft 8 will be driven to rotate passively by the cyclic conveyor belt 6, and through the passive rotation damping of the drive shaft 8, the strip 5 is subjected to a reverse tensile force;

[0068] Step S6, repeatedly execute steps S3 - S4 until all the hot-rolled coils on the current production line are completely coiled.

[0069] Specifically, when the first group of electric grippers 10 runs directly above the finishing mill end reflector 17, it triggers the photoelectric sensor 16, causing the clamping motor to rotate forward to drive the chuck 11 to perform the clamping action to clamp the strip 5 and provide tension for it; when the second group of electric grippers 10 runs directly above the finishing mill end reflector 17... when the first group of electric grippers 10 runs directly above the coiler end reflector 18, it triggers the photoelectric sensor 16 again, causing the clamping motor to rotate in reverse to drive the chuck 11 to perform the loosening action...; In this way, the steel strip always maintains a certain constant tension during the forward movement process to ensure the flat and stable transmission of the hot-rolled coil during production.

[0070] Furthermore, the rotational speed W of the cyclic drive motor 7 is calculated and determined according to the layout spacing D of the multiple groups of electric grippers 10 and the strip transmission distance L between the outlet end of the finishing mill unit 2 and the inlet end of the coiling unit 3, specifically as follows:

[0071] W = C × W0 × L / D

[0072] In the formula, W0 is the default operating rotational speed of the cyclic drive motor 7, which is determined through production experience; C is the mechanical error correction coefficient.

[0073] Furthermore, the parts not detailed in this application are the same as the prior art or are implemented using the prior art.

[0074] In summary:

[0075] 1. A constant tension transmission device for the exit of the finishing mill of a hot continuous rolling steel coil provided by the present invention, by symmetrically arranging two sets of cyclic constant tension mechanisms on both sides of the strip conveyor rollers between the exit of the finishing mill unit and the coiling unit, and combining multiple groups of electric grippers equally spaced on the cyclic conveyor belt to alternately provide stable tension for the strip, can effectively avoid situations such as the steel coil having waves, thickness fluctuations, and strip stacking, can greatly improve the product quality of the strip hot continuous rolling, and reduce the production safety risk;

[0076] 2. The control method of the constant-tension transmission device provided by the present invention can further improve the stability of the device operation through the reasonable clamping control logic of multiple groups of electric grippers, enabling the hot-rolled coil to maintain a certain constant tension from the finish rolling exit to the coiling process, ensuring the smooth transmission of the hot-rolled coil during production, and significantly improving production efficiency.

[0077] 3. The overall structure of the present invention is compact, easy to install and arrange, and the electric grippers can be telescopically adjusted, which can be applied to the production of strip steels with various different widths, with strong practicability and easy to promote.

[0078] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0079] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0080] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A constant-tension transmission device for the finishing mill outlet of hot-rolled steel coils, characterized in that: It includes two sets of circulating constant tension mechanisms (1) symmetrically installed on both sides of a conveying roller (4) respectively between the outlet end of a finishing mill unit (2) and the inlet end of a coiling unit (3) in a hot continuous rolling steel coil production line; The circulating constant tension mechanism (1) includes a circulating conveyor belt (6) arranged in parallel on the side of a strip steel (5). Both ends of the circulating conveyor belt (6) are respectively wound around a driving shaft (8) and a driven shaft (9), and the driving shaft (8) is connected with a circulating driving motor (7); At a height where the outer surface of the circulating conveyor belt (6) is flush with the strip steel (5), a plurality of groups of telescopically adjustable electric grippers (10) are evenly installed at a preset interval.

2. The constant tension transmission device at the finishing mill outlet of a hot continuous rolling steel coil according to claim 1, wherein: The electric gripper (10) includes two jaws (11) installed at one end of an electric drive gripping actuator (12), and the other end of the electric drive gripping actuator (12) is connected with a mounting seat (14) through a telescopic adjustment mechanism (13). The electric gripper (10) is fixedly installed on the outer surface of the circulating conveyor belt (6) through the mounting seat (14).

3. A constant tension transmission device for the finish rolling exit of a hot continuous rolling steel coil according to claim 2, characterized in that: The distance between the electric grippers (10) of the circulating constant tension mechanisms (1) on both sides of the conveying roller (4) is adapted to the width of the strip steel (5).

4. A hot continuous rolling steel coil finishing mill exit constant tension transmission device according to claim 2, characterized in that: A protective sleeve (15) for preventing the strip steel from being scratched is sleeved on the gripping end of the jaw (11), and a photoelectric sensor (16) is installed on the bottom surface of the electric drive gripping actuator (12).

5. The constant-tension transmission device at the finishing mill outlet of a hot continuous rolling steel coil according to claim 4, characterized in that: The electric drive gripping actuator (12) includes sliders fixedly connected with the two jaws (11) respectively. Both sliders are slidably installed on a slide rail and are driven by a gripping motor to move along the slide rail to realize gripping and releasing actions.

6. The constant-tension transmission device at the finishing mill outlet of a hot continuous rolling steel coil according to claim 5, wherein: The contactor terminal for switching the rotation direction of the motor in the gripping motor is electrically connected with the signal output end of the photoelectric sensor (16).

7. A hot continuous rolling steel coil finishing mill exit constant tension transmission device according to claim 4, characterized in that: The driving shaft (8) is arranged at one end of the circulating constant tension mechanism (1) close to the finishing mill unit (2), the driven shaft (9) is arranged at one end of the circulating constant tension mechanism (1) close to the coiling unit (3), and the rotation speed of the circulating driving motor (7) is matched with the rotation speed of the conveying roller (4); When the circulating driving motor (7) is started, the driving shaft (8) will actively rotate to drive the circulating conveyor belt (6) to circulate and rotate along the strip steel conveying direction, so that the electric gripper (10) clamps the strip steel (5) and provides forward tension for it; When the circulating driving motor (7) stops, the circulating conveyor belt (6) will be driven by the electric gripper (10) clamping the strip steel (5) to continue rotating along the strip steel conveying direction. At the same time, the driving shaft (8) will be driven to rotate passively by the circulating conveyor belt (6), and the driving shaft (8) is provided with passive rotation damping so that the strip steel (5) is subjected to backward tension.

8. A constant tension transmission device for the finish rolling exit of a hot continuous rolling steel coil according to claim 7, characterized in that: A finishing mill end reflector (17) adapted to the photoelectric sensor (16) is installed on the upper surface of the conveying roller shaft corresponding to the position of the driving shaft (8) at the outlet end of the finishing mill unit (2); On the upper surface of the conveying roller shaft at the position corresponding to the driven shaft (9) at the inlet end of the coiling unit (3), a coiling machine end reflector (18) adapted to the photoelectric sensor (16) is installed.

9. A control method for a constant-tension transmission device at the finishing mill outlet of hot-rolled steel coils, which adopts the device described in any one of claims 1 to 8, characterized in that, It includes the following steps: Step S1, adjustment of the telescopic length of the electric gripper: Adjust the length of the electric grippers (10) of the two-sided circulating constant tension mechanism (1) through the telescopic adjustment mechanism (13) so that the distance between the two-sided electric grippers (10) is adapted to the width of the strip steel (5). Step S2, start of the circulating constant tension mechanism: Start the circulating drive motor (7) of the two-sided circulating constant tension mechanism (1) so that the circulating conveyor belt (6) drives multiple groups of electric grippers (10) thereon to rotate in a cycle along the strip steel conveying direction, and control the rotation speed of the circulating drive motor (7) to match the rotation speed of the conveying roller (4). Step S3, automatic clamping control of the electric gripper: When the nth group of electric grippers (10) on both sides runs directly above the finishing mill end reflector (17), it will trigger the photoelectric sensor (16), causing the clamping motor to rotate forward to drive the chuck (11) to perform a clamping action to clamp the strip steel (5) and provide tension for it. Step S4, automatic release control of the electric gripper: When the nth group of electric grippers (10) on both sides runs directly above the coiling machine end reflector (18), it will trigger the photoelectric sensor (16) again, causing the clamping motor to rotate in reverse to drive the chuck (11) to perform a release action to release the strip steel (5). Wherein, n = 1, 2, 3, 4, ……; Step S5, automatic shutdown control of the circulating constant tension mechanism: When the induction device in the coiling unit (3) detects that the head of the strip steel (5) has entered the coiling unit (3), control the circulating drive motor (7) to automatically shut down, so that the circulating conveyor belt (6) continues to rotate along the strip steel conveying direction under the drive of the electric grippers (10) clamping the strip steel (5). At the same time, the drive shaft (8) will be driven to rotate passively under the drive of the circulating conveyor belt (6), and through the passive rotation damping of the drive shaft (8), the strip steel (5) is subjected to a reverse tensile force. Step S6, repeatedly execute steps S3 - S4 until all the hot-rolled coils on the current production line are coiled.

10. The control method according to claim 9, wherein The rotation speed W of the circulating drive motor (7) is calculated and determined according to the layout spacing D of the multiple groups of electric grippers (10) and the strip steel transmission distance L between the outlet end of the finishing mill unit (2) and the inlet end of the coiling unit (3), specifically as follows: W = C × W0 × L / D In the formula, W0 is the default working rotation speed of the circulating drive motor (7), which is determined through production experience; C is the mechanical error correction coefficient.

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