An improved method of operating a coiling device for flat coils of steel

Abstract

This invention discloses an operating method for a steel coiling device that improves the flatness of steel coils, belonging to the field of steel coil production technology. The steel coiling device includes a coiler, coiling aid components, and a coiling mandrel; the coiling mandrel is located at the center of the coiler frame, and three coiling aid components are provided. The operating method of this steel coiling device changes the original constant tension coiling mode to segmented control. During the expansion of the coiling mandrel, the tension at the front is corrected to 50-58 N / mm², and the tension in the middle and rear sections is corrected to 20-25 N / mm². Direct uncoiling after coiling is replaced with manual uncoiling after an 80-second delay. During uncoiling, the strip is manually adjusted to a 90° tail angle, allowing the strip to self-correct into a circular shape under gravity. This avoids the problem of loosening that occurs when the system can no longer provide constant tension after the mandrel torque reaches its peak as the coil diameter increases, as in traditional constant tension coiling.

Description

Technical Field

[0001] This invention relates to the field of steel coil production technology, and in particular to an operating method for a steel coiling device that can improve the flatness of steel coils. Background Technology

[0002] Steel coils, also known as rolled steel, are steel products formed into coils through hot or cold pressing. Formed coils are mainly hot-rolled coils and cold-rolled coils. Hot-rolled coils are processed products before the recrystallization of steel billets. Cold-rolled coils are a subsequent processing step of hot-rolled coils. Steel coils typically weigh around 15-30 tons. my country's hot-rolling production capacity is continuously expanding, with dozens of hot-rolling production lines already in operation, and several more projects about to be built or put into production. To facilitate storage and transportation, and for various processing (such as processing into steel plates, steel strips, etc.), flat steel coils are typically used, and after production, they also require coiling machines for winding.

[0003] During coiling, such as when rolling high-strength thin strip steels like HP345 and Q355, constant tension coiling is typically used. However, as the coil diameter increases, the mandrel torque reaches its peak and the system can no longer provide constant tension, resulting in loose coiling. This leads to flat coil failure and inner ring collapse, making it impossible to flatten and finish the coil. This requires additional manual processing, increasing labor intensity and production costs, and affecting production efficiency and product yield. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides an operating method for a steel coiling device that can improve the flatness of steel coils, thereby preventing the strip from loosening and also preventing the inner ring from collapsing and failing to achieve a smooth finish.

[0005] To solve the above-mentioned technical problems and achieve the above-mentioned technical effects, the present invention is implemented through the following technical solution:

[0006] The technical solution of the present invention is: an operation method of a steel coiling device that can improve the flatness of steel coils, including a coiler, a coiling aid assembly and a coiling mandrel;

[0007] The winding mandrel is positioned at the center of the winding machine frame, and a drive motor for rotating the winding mandrel is mounted on the winding machine frame. Three winding aid assemblies are arranged at intervals around the winding mandrel on the winding machine frame. Each winding aid assembly includes a winding aid roller and a winding aid roller mounting plate. The tail end of each winding aid roller mounting plate is rotatably connected to the frame via a corresponding rotating shaft. A pre-drilled groove is provided on the inner wall of the head end of each winding aid roller mounting plate, allowing each winding aid roller to be rotatably mounted within its corresponding pre-drilled groove around its own axis. Each winding aid roller is parallel to the winding mandrel and is driven by a corresponding variable-speed motor.

[0008] Each of the coiling aid components is driven by a corresponding hydraulic cylinder to open and close relative to the coiling mandrel. The three coiling aid components and the coiling mandrel form a movable cavity for accommodating the coiled strip. The hydraulic cylinder includes a rodless cavity and a rod cavity. The end of the hydraulic rod in the rod cavity is hinged to the outer wall of the first end of the corresponding coiling roller mounting plate. Pressure sensors for detecting the hydraulic cylinder oil pressure are respectively provided on the rodless cavity and the rod cavity, realizing pressure detection and feedback of the coiling aid components. The pressure of the coiling aid components is then controlled by a pressure controller. A position sensor for detecting the displacement of the coiling aid components is provided on the rodless cavity, realizing displacement detection and feedback of the coiling aid components. The position of the coiling aid components is then controlled by a displacement controller.

[0009] The coiler also includes an upper clamping roller capable of feeding material, and both the upper clamping roller and the single coiling roller mounting plate are equipped with accelerometers capable of tracking the strip. Each coiling roller mounting plate is also equipped with a limit switch capable of detecting the opening limit position of the coiling assembly.

[0010] S0. Initialization: Before coiling the steel, record the diameter of the mandrel of the coiling mandrel and preset it as the actual diameter value of the mandrel. Based on the thickness of the strip itself plus the space allowance, determine the roll gap value between the coiling aid assembly and the coiling mandrel, thereby determining the space range of the active cavity. Then, start the hydraulic cylinder to open the coiling aid assembly. When the coiling aid assembly is opened to the range specified by the limit switch, the limit switch closes the hydraulic cylinder, so that the position sensor obtains and records the maximum range value of the coiling aid assembly opening, and combined with the roll gap value, determines the minimum range value of the coiling aid assembly in the closed state.

[0011] S1. Data preset: Based on the maximum and minimum range values, preset the initial winding and the middle and later winding of the winding thickness.

[0012] S2. Steel coil fixing: After hot rolling, the strip steel is fed into the movable cavity through the upper feeding clamping roller, and the head of the strip steel is fixed on the surface of the coiling mandrel.

[0013] S3. Coil cooling: When the strip head is fixed on the mandrel, manually turn on the mandrel cooling water. By reducing the temperature of the connection between the strip and the mandrel, the internal structure undergoes a phase change, thus ensuring that the coil has sufficient rigidity and is not easy to loosen.

[0014] S4. After the steel coil is wound and cooled, the drive motor on the coiler frame drives the coiling mandrel to rotate. The rotating mandrel then winds the strip steel. During the winding process, hydraulic cylinders are activated, and each hydraulic cylinder drives its corresponding winding aid component to close, pressing and adhering the steel coil to maintain tension and prevent loosening. To ensure system stability, a pressure threshold value is preset in the system. The system will only proceed to the next step when the actual pressure reaches or exceeds this value. A delay time is also set to ensure that the system will not malfunction due to short-term pressure changes or pressure fluctuations caused by operational variations. Once both the pressure threshold value and the delay time condition are met, i.e. When the actual pressure reaches or exceeds the threshold value and a preset delay time has elapsed, the system will activate the constant pressure control setting value, which is 100kN. The calculation method is: constant pressure control setting value = thickness × width × reserve value × unit tension, where the reserve value is 7.85 and the unit tension is the tension applied by the coiling assembly in the preset value. The system tracks the position of the strip steel through variables. When this condition is met, it will trigger the RS trigger to set the command, which can ensure that the constant pressure control setting value is not affected by the fluctuation of the actual pressure value. If the system detects that the actual pressure drops below the preset threshold value during the activation of the constant pressure control setting value, the system will cancel the constant pressure control setting value.

[0015] S401, Initial winding: When the mandrel begins to wind the strip, the thickness of the steel coil is at the initial winding stage. The system controls the oil pressure of the hydraulic cylinder through the controller, so that the winding aid assembly applies initial pressure to the steel coil. The tension of the initial pressure is 50~58 N / mm².

[0016] S402, Coiling Stage Two: During the coiling process, the hydraulic cylinder gradually drives the coiling aid assembly to open as the strip thickness increases. While maintaining the specified roll gap value, the system can detect the movement distance data of the coiling aid assembly through the position sensor. The movement distance of the coiling aid assembly is increased based on the minimum range value to obtain the coil thickness. When the coil thickness reaches the preset middle section coiling, the system adjusts and corrects the pressure of the hydraulic cylinder through the controller. The coiling aid assembly then applies pressure to the coil in the middle and rear sections. The tension of the middle and rear section pressure is 20~25 N / mm².

[0017] S5. Winding complete. After winding is completed, let the material stand still in the winding machine for a period of time, and then unload it by adjusting the angle.

[0018] Furthermore, in step S0, when the hydraulic cylinder drives the coiling assembly to open continuously, after the coiling roller mounting plate reaches the designated position of the limit switch, the limit switch triggers the hydraulic cylinder to close. At this time, the coiling assembly is opened to the maximum range value, while the minimum range value is composed of the roll gap value plus the actual diameter value of the mandrel. The space reserve value can ensure that the strip can be smoothly coiled without affecting the tension applied to the strip by the coiling assembly.

[0019] Furthermore, in step S1, the system combines the maximum and minimum range values. When the coiling aid assembly moves with the minimum range value as the base point, the distance of the coiling aid assembly's displacement is the thickness of the coiled steel.

[0020] Furthermore, in step S4, the pressure sensor and position sensor perform real-time detection so that the system can observe in real time. The position sensor calculates the actual roll gap value of the winding aid assembly based on the actual diameter gauge of the mandrel of the winding mandrel and the displacement data of the winding aid assembly, while the pressure sensor calculates the actual pressure value of the winding aid assembly by detecting the pressure in the rod cavity and the rodless cavity.

[0021] Furthermore, in step S5, after winding is completed, the method of directly unwinding the coil after winding is changed to manually unwinding after an extension of 80 seconds. During unwinding, the strip is manually adjusted to a fixed tail angle of 90° so that the strip can automatically repair itself into a circle under the action of gravity.

[0022] The beneficial technical effects of this invention are as follows: By changing the original constant tension winding mode of the system to segmented control, the tension at the front of the winding mandrel expansion is corrected to 50~58 N / mm², and the tension in the middle and rear sections is corrected to 20~25 N / mm². This prevents the steel coil from becoming loose during the forming process because the system can no longer provide constant tension after the mandrel torque reaches its peak as the coil diameter increases, thus avoiding the problem of flattening and failure. At the same time, the direct unwinding after winding is changed to manual unwinding after an extension of 80 seconds. During unwinding, the strip is manually adjusted to a 90° fixed tail, allowing the strip to self-correct into a round shape under gravity. This avoids the problem of excessive stress on the steel coil caused by removing it immediately after winding, resulting in inner ring collapse that cannot be flattened and finished, and the need for additional manual processing, which increases labor intensity and production costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a steel coiling device that can improve the flatness of steel coils according to the present invention;

[0024] Figure 2 This is a schematic diagram of the double-ring control of the coiling roller assembly of a coiling device that can improve the flatness of steel coils in this invention;

[0025] Figure 3 This is a schematic diagram of the operation method of a steel coiling device that can improve the flatness of steel coils in this invention;

[0026] Figure 4 This is a schematic diagram of a typical constant pressure control curve for a steel coiling device that can improve the flatness of steel coils in this invention.

[0027] The numbers and letters in the diagram represent the names of the corresponding components:

[0028] 1. Winding aid assembly; 11. Winding aid roller; 12. Winding aid roller mounting plate; 13. Rotary shaft; 2. Hydraulic cylinder; 21. Rodless chamber; 22. Rod chamber; 3. Pressure sensor; 4. Position sensor; 5. Winding mandrel. Detailed Implementation

[0029] In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] See appendix Figure 1 As shown, a steel coiling device for improving the flatness of steel coils includes a coiler, a coiling aid assembly 1, and a coiling mandrel 5. The coiler also includes an upper clamping roller capable of feeding material, and both the upper clamping roller and each of the individual coiling aid roller mounting plates 12 are equipped with accelerometers capable of tracking the strip steel. Each coiling aid roller mounting plate 12 is also equipped with a limit switch capable of detecting the opening limit position of the coiling aid assembly 1. The coiling mandrel 5 is located at the center of the coiler frame, and a drive motor for driving the coiling mandrel 5 to rotate is installed on the coiler frame. The coiling aid assembly 1 is equipped with... Three winding aid assemblies 1 are arranged at intervals around the winding mandrel 5 on the frame of the winding machine. Each winding aid assembly 1 includes a winding aid roller 11 and a winding aid roller mounting plate 12. The tail end of each winding aid roller mounting plate 12 is rotatably connected to the frame through a corresponding rotating shaft 13. The inner wall of the head end of each winding aid roller mounting plate 12 is provided with a reserved groove. Each winding aid roller 11 can be rotatably installed in its corresponding reserved groove around its own axis. Each winding aid roller 11 is parallel to the winding mandrel 5 and each winding aid roller 11 is driven by a corresponding variable speed motor.

[0031] Before winding, the three winding aid components 1 are in the open state. Then the strip head is fixed on the surface of the winding mandrel 5. After fixing, the three winding aid components 1 are closed, and the drive motor drives the winding mandrel 5 to rotate, so that the winding mandrel 5 drives the strip to wind up. During the winding process, the winding aid components 1 are attached to the surface of the wound strip to apply tension.

[0032] Each of the coiling aid components 1 is driven by a corresponding hydraulic cylinder 2 to open and close relative to the coiling mandrel 5. The three coiling aid components 1 and the coiling mandrel 5 form a movable cavity for accommodating the coiled strip. The hydraulic cylinder 2 includes a rodless cavity 21 and a rod cavity 22, with the end of the hydraulic rod in the rod cavity 22 hinged to the outer wall of the first end of the corresponding coiling roller mounting plate 12. Pressure sensors 3 for detecting the oil pressure of the hydraulic cylinder 2 are respectively installed on the rodless cavity 21 and the rod cavity 22, enabling control of the coiling aid components. The pressure detection and feedback of the coiling assembly 1 are realized, and the pressure control of the coiling assembly 1 is realized through the pressure controller. The rodless cavity 21 is equipped with a position sensor 4 for detecting the displacement of the coiling assembly 1, realizing the displacement detection and feedback of the coiling assembly 1, and then realizing the position control of the coiling assembly 1 through the displacement controller. Among them, the two pressure sensors 3 can detect the oil pressure of the hydraulic cylinder 2 in real time to detect the tension generated when the strip is coiled. When the hydraulic cylinder 2 drives the coiling assembly 1 to move, the position sensor 4 can detect the position of the coiling assembly 1 in real time.

[0033] See Figure 2 As shown, the analysis program reveals that the control structure of the roll-up assembly is a dual-loop control system, with the outer loop being the position control loop and the inner loop being the pressure control loop. The output of the position controller is the set input of the pressure controller.

[0034] See appendix Figure 3 As shown, an operating method for a steel coiling device that can improve the flatness of steel coils includes the following steps:

[0035] S0. Initialization: Before coiling the steel, the diameter of the mandrel 5 is recorded and preset to the actual diameter value of the mandrel 5. The roll gap value between the coiling aid assembly 1 and the coiling mandrel 5 is determined based on the thickness of the strip and the space allowance value, thereby determining the space range of the active cavity. Then, the hydraulic cylinder 2 is activated to open the coiling aid assembly 1. When the coiling aid assembly 1 is opened to the range specified by the limit switch, the limit switch closes the hydraulic cylinder 2, so that the position sensor 4 obtains and records the maximum range value of the opening of the coiling aid assembly 1. Combined with the roll gap value, the minimum range value of the closed state of the coiling aid assembly 1 is determined. When the hydraulic cylinder 2 drives the coiling aid assembly 1 to continue to open, after the coiling aid roller mounting plate 12 reaches the specified position of the limit switch, the limit switch triggers the hydraulic cylinder 2 to close. At this time, the coiling aid assembly 1 is opened to the maximum range value, and the minimum range value is composed of the roll gap value plus the actual diameter value of the mandrel. The space allowance value can ensure that the strip can be coiled smoothly without affecting the tension applied to the strip by the coiling aid assembly 1.

[0036] S1. Data preset: Based on the maximum and minimum range values, the winding thickness is preset for the initial winding and the middle and later winding. The system combines the maximum and minimum range values. When the auxiliary winding component 1 moves with the minimum range value as the base point, the distance of the displacement of the auxiliary winding component 1 is the thickness of the coil.

[0037] S2. Steel coil fixing: After hot rolling, the strip steel is fed into the movable cavity through the upper feeding clamping roller, and the head of the strip steel is fixed on the surface of the coiling mandrel 5. The system combines the maximum range value and the minimum range value. When the coiling aid component 1 moves with the minimum range value as the reference point, the distance of the displacement of the coiling aid component 1 is the thickness of the coil steel.

[0038] S3. Coil cooling: When the strip head is fixed on the coiling mandrel 5, manually turn on the cooling water of the coiling mandrel 5. By reducing the temperature of the connection between the strip and the coiling mandrel 5, the internal structure undergoes a phase change, so that the coil has sufficient rigidity and is not easy to loosen.

[0039] S4. After the steel coil is wound up and cooled, the drive motor on the coiler frame drives the coiling mandrel 5 to rotate. The coiling mandrel 5 then rotates to wind up the strip steel. During the winding process, the hydraulic cylinder 2 is activated. Each hydraulic cylinder 2 drives the corresponding winding aid component 1 to close, pressing and fitting the steel coil to maintain tension and prevent loosening. The pressure sensor 3 and the position sensor 4 perform real-time detection so that the system can observe in real time. The position sensor 4 calculates the actual roll gap value of the winding aid component 1 based on the actual diameter gauge of the mandrel of the coiling mandrel 5 and the displacement data of the winding aid component 1. The pressure sensor 3 calculates the actual pressure value of the winding aid component 1 through the pressure detection of the rod chamber 22 and the rodless chamber 21.

[0040] S401, Initial winding: When the coiling mandrel 5 first starts winding the strip, the thickness of the steel coil is the initial winding thickness. The system controls the oil pressure of the hydraulic cylinder 2 through the controller, so that the coiling aid assembly 1 applies initial pressure to the steel coil. The tension of the initial pressure is 50~58 N / mm².

[0041] S402, Coiling Stage Two: During the coiling process, the hydraulic cylinder 2 gradually drives the coiling aid component 1 to open as the strip thickness increases. While maintaining the specified roll gap value, the system can detect the movement distance data of the coiling aid component 1 through the position sensor 4. The movement distance of the coiling aid component 1 is increased based on the minimum range value to obtain the coil thickness. When the coil thickness reaches the preset middle section coiling, the system adjusts and corrects the pressure of the hydraulic cylinder 2 through the controller. The coiling aid component 1 then applies pressure to the coil in the middle and rear sections. The tension of the middle and rear section pressure is 20~25 N / mm².

[0042] S5. After winding is completed, the strip is left to stand in the winding machine for a period of time after winding is completed, and then unloaded by adjusting the angle. In this case, the direct unloading after winding is changed to manual unloading after extending the time by 80 seconds. During unloading, the tail of the strip is manually adjusted to 90° so that the strip can self-repair into a circle under the action of gravity.

[0043] Furthermore, in step S4, to ensure system stability, a pressure threshold value is preset in the system. The system will only proceed to the next step when the actual pressure reaches or exceeds this value. A delay time is also set to prevent malfunctions due to brief pressure changes or pressure fluctuations caused by operational volatility. Once both the pressure threshold and delay time conditions are met—that is, the actual pressure reaches or exceeds the threshold value and the preset delay time has elapsed—the system will activate the constant pressure control setting value. This constant pressure control setting value is 100kN, calculated as: Constant pressure control setting value = Thickness × Width × Reserve value × Unit tension, where the reserve value is 7.85, and the unit tension is the tension applied by the coiling assembly 1 in the preset value. The system tracks the strip position using variables. Meeting this condition will trigger an RS trigger set command, ensuring that the constant pressure control setting value is not affected by fluctuations in the actual pressure value. If, during the activation of the constant pressure control setting value, the system detects that the actual pressure has dropped below the preset threshold value, the system will cancel the constant pressure control setting value. Based on the above optimization, the process can be divided into five steps:

[0044] Step 1: Zero-position calibration and magnetic scale status check of the winding aid component 1. Perform zero-position calibration and check whether the magnetic scale is damaged or has inaccurate readings. Replace or calibrate the magnetic scale if necessary to ensure the initial position of the winding aid component 1 is accurate. As a measuring element, the condition of the magnetic scale directly affects the accuracy of position control.

[0045] Step 2: Check the status of pressure sensor 3. Check whether pressure sensor 3 is working properly and verify whether its reading is accurate. If necessary, calibrate or replace it.

[0046] Step 3: Adjust the constant pressure control activation conditions of the coiling aid component 1. Analyze and modify the constant pressure control activation conditions in the existing program, such as lowering the pressure threshold value and adjusting the delay time to adapt to instantaneous pressure fluctuations. Ensure that the constant pressure control setting can be stably activated when the strip position tracking conditions are met. This optimizes the activation conditions of constant pressure control and avoids excessive pressure on the strip head.

[0047] Step 4: Set the constant pressure setting value. Set the constant pressure setting value of the winding aid component 1 to 100kN to ensure that the pressure remains constant throughout the entire operation.

[0048] Step 5: Adjust the roll gap value of the position setting of the coiling aid component 1. By making the actual roll gap between the coiling aid component 1 and the winding mandrel 5 consist of the thickness of the strip itself plus the space allowance (generally 8mm), it is ensured that even the thinnest strip can be effectively wound without overpressure. This ensures that the coiling aid component 1 can work normally under constant pressure control, while avoiding excessive pressure on the strip.

[0049] See Figure 4 As shown, this is a typical constant pressure control curve of the roll gap and pressure of the coiling aid component 1 of the coiler. The constant pressure control of the coiling aid component 1 is activated when pressing the head of the strip steel and enters the constant pressure control mode. This control method can reduce the pressure impact generated when the position of the coiling aid component 1 is controlled. Because of the control of the pressure limit, the actual pressure of the coiling aid component 1 fluctuates around the constant pressure set value, which protects the safety of the equipment to a certain extent.

[0050] This method changes the original constant tension winding mode of the system to segmented control. When the winding mandrel 5 expands, the tension in the front section is corrected to 50~58 N / mm², and the tension in the middle and rear sections is corrected to 20~25 N / mm². This prevents the steel coil from loosening during the forming process because the system can no longer provide constant tension after the mandrel torque reaches its peak as the coil diameter increases. This avoids the problem of flattening and failure. At the same time, in step S5, the direct unwinding method after winding is changed to manual unwinding after an extension of 80 seconds. This avoids the problem of removing the coil immediately after winding, which would cause the steel coil to be subjected to greater stress, resulting in inner ring collapse and failure to be flattened and finished. This would also require additional manual processing, increasing labor intensity and production costs.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An operating method for a steel coiling device that can improve the flatness of steel coils, characterized in that: include: Winding machine, winding aid assembly (1) and winding mandrel (5); The winding mandrel (5) is located at the center of the winding machine frame, and a drive motor for driving the winding mandrel (5) to rotate is provided on the winding machine frame. There are three winding aid components (1), which are arranged around the winding mandrel (5) at intervals on the winding machine frame. Each winding aid component (1) includes a winding aid roller (11) and a winding aid roller mounting plate (12). The tail end of each winding aid roller mounting plate (12) is rotatably connected to the frame through a corresponding rotating shaft (13). A reserved groove is opened on the inner wall of the head end of each winding aid roller mounting plate (12). Each winding aid roller (11) can be rotatably installed in its corresponding reserved groove around its own axis. Each winding aid roller (11) is parallel to the winding mandrel (5), and each winding aid roller (11) has a corresponding variable speed motor drive. Each of the coiling aid components (1) is driven by a corresponding hydraulic cylinder (2) to open and close relative to the coiling mandrel (5). The three coiling aid components (1) and the coiling mandrel (5) form an active cavity for accommodating coiled strip steel. The hydraulic cylinder (2) includes a rodless cavity (21) and a rod cavity (22). The end of the hydraulic rod in the rod cavity (22) is hinged to the outer wall of the first end of the corresponding coiling roller mounting plate (12). Pressure sensors (3) for detecting the oil pressure of the hydraulic cylinder (2) are respectively provided on the rodless cavity (21) and the rod cavity (22), realizing the pressure detection and feedback of the coiling aid components (1), and then realizing the pressure control of the coiling aid components (1) through the pressure controller. The rodless cavity (21) is provided with a position sensor (4) for detecting the displacement of the coiling aid components (1), realizing the displacement detection and feedback of the coiling aid components (1), and then realizing the position control of the coiling aid components (1) through the displacement controller. The coiler also includes an upper clamping roller capable of feeding material, and both the upper clamping roller and the individual coiling roller mounting plate (12) are equipped with accelerometers capable of tracking the strip steel. Each coiling roller mounting plate (12) is also equipped with a limit switch capable of detecting the opening limit position of the coiling assembly (1). S0. Initialization: Before coiling the steel, record the diameter of the mandrel of the coiling mandrel (5) and preset it as the actual diameter value of the mandrel of the coiling mandrel (5). According to the thickness value of the strip steel itself plus the space reserve value, specify the roll gap value between the coiling aid assembly (1) and the coiling mandrel (5) to determine the space range of the active cavity. Then start the hydraulic cylinder (2) to open the coiling aid assembly (1). When the coiling aid assembly (1) is opened to the range specified by the limit switch, the limit switch closes the hydraulic cylinder (2) so that the position sensor (4) can obtain and record the maximum range value of the opening of the coiling aid assembly (1) and, combined with the roll gap value, specify the minimum range value of the closed state of the coiling aid assembly (1). S1. Data preset: Based on the maximum and minimum range values, preset the initial winding and the middle and later winding of the winding thickness. S2. The steel coil is fixed. After hot rolling, the strip is fed into the movable cavity through the upper feeding clamping roller and the head of the strip is fixed on the surface of the coiling mandrel (5). S3. Cooling the steel coil: When the head of the strip is fixed on the coiling mandrel (5), manually turn on the cooling water of the coiling mandrel (5). By reducing the temperature of the connection between the strip and the coiling mandrel (5), the internal structure undergoes a phase change, so that the steel coil can maintain sufficient rigidity and is not easy to loosen. S4. After the steel coil is wound up and cooled, the drive motor on the coiler frame drives the coiling mandrel (5) to rotate. The coiling mandrel (5) then rotates to wind up the strip steel. During the winding process, the hydraulic cylinder (2) is activated. Each hydraulic cylinder (2) drives the corresponding winding aid component (1) to close, pressing and fitting the steel coil to maintain tension and prevent loosening. To ensure system stability, a pressure threshold value is preset in the system. The system will only proceed to the next step when the actual pressure reaches or exceeds this value. At the same time, a delay time is set to ensure that the system will not malfunction due to short-term pressure changes or pressure changes caused by operational fluctuations. Once the pressure threshold value and the delay time are both set, the system will proceed to the next step. Simultaneously, if the actual pressure reaches or exceeds the threshold value and a preset delay time has elapsed, the system will activate the constant pressure control setting value. The constant pressure control setting value is 100kN, and the calculation method is: constant pressure control setting value = thickness × width × reserve value × unit tension, where the reserve value is 7.85, and the unit tension is the tension applied by the coiling component (1) in the preset value. The system tracks the position of the strip steel through variables. The satisfaction of this condition will cause the RS trigger to set the command, which can ensure that the constant pressure control setting value will not be affected by the fluctuation of the actual pressure value. If the system detects that the actual pressure drops below the preset threshold value during the activation of the constant pressure control setting value, the system will cancel the constant pressure control setting value. S401, Initial winding: When the coiling mandrel (5) begins to wind the strip, the thickness of the steel coil is the initial winding thickness. The system controls the oil pressure of the hydraulic cylinder (2) through the controller, so that the winding aid assembly (1) applies initial pressure to the steel coil. The tension of the initial pressure is 50~58 N / mm². S402, Coiling Stage Two: During the coiling process, the hydraulic cylinder (2) will gradually drive the coiling aid (1) to open as the thickness of the strip is coiled. While maintaining the specified roll gap value, the system can detect the moving distance data of the coiling aid (1) through the position sensor (4), and increase the moving distance of the coiling aid (1) based on the minimum range value to obtain the thickness of the coil. When the thickness of the coil reaches the preset middle section coiling, the system adjusts and corrects the pressure of the hydraulic cylinder (2) through the controller, and the coiling aid (1) applies pressure to the middle and rear sections of the steel coil. The tension of the middle and rear section pressure is 20~25 N / mm². S5. Winding complete. After winding is completed, let the material stand still in the winding machine for a period of time, and then unload it by adjusting the angle.

2. The operating method of the steel coiling device for improving the flatness of steel coils according to claim 1, characterized in that: In step S0, when the hydraulic cylinder (2) drives the coiling assembly (1) to open continuously, the coiling roller mounting plate (12) reaches the specified position of the limit switch, and the limit switch triggers the hydraulic cylinder (2) to close. At this time, the coiling assembly (1) is opened to the maximum range value, while the minimum range value is composed of the roller gap value plus the actual diameter value of the mandrel. The space reserve value can ensure that the strip can be smoothly coiled without affecting the tension applied to the strip by the coiling assembly (1).

3. The operating method of the steel coiling device for improving the flatness of steel coils according to claim 1, characterized in that: In step S1, the system combines the maximum range value and the minimum range value. When the coiling aid (1) is displaced with the minimum range value as the base point, the distance of the displacement of the coiling aid (1) is the thickness of the coiled steel.

4. The operating method of the steel coiling device for improving the flatness of steel coils according to claim 1, characterized in that: In step S4, pressure sensor (3) and position sensor (4) perform real-time detection so that the system can observe in real time. Position sensor (4) calculates the actual roll gap value of winding assembly (1) based on the actual diameter gauge of the mandrel of winding mandrel (5) and the displacement data of winding assembly (1), while pressure sensor (3) calculates the actual pressure value of winding assembly (1) through pressure detection in rod cavity (22) and rodless cavity (21).

5. The operating method of the steel coiling device for improving the flatness of steel coils according to claim 1, characterized in that: In step S5, after winding is completed, the method of direct unwinding after winding is changed to manual unwinding after an extension of 80 seconds. During unwinding, the strip tail is manually adjusted to 90° so that the strip can automatically repair itself into a circle under the action of gravity.

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