Steel coiling device capable of improving flat coil of steel grade and control method of steel coiling device

Abstract

The invention discloses a steel coiling device capable of improving a flat coil of a steel grade and a control method of the steel coiling device, and belongs to the technical field of steel coil production. The steel coiling device capable of improving the flat coil of the steel grade comprises a coiling machine, a coiling assisting assembly and a coiling core rod, the coiling core rod is arranged in the center of the coiling machine rack, and the number of the coiling assisting assemblies is three. According to the steel coiling device capable of improving the flat coil of the steel grade and the control method of the steel coiling device, an original constant tension coiling mode of a system is changed into segmented control, the front tension is corrected to be 50-58 N / square millimeters when a coiling core rod is expanded, the middle-rear section tension is corrected to be 20-25 N / square millimeters, direct coil unloading after coiling is completed in cooperation with coiling is changed into manual coil unloading after 80 seconds of extension, and the production efficiency is greatly improved. And the tail of the strip steel is manually adjusted to be 90 degrees during coil unloading, so that the strip steel is automatically repaired to be round under the action of gravity, and the problem that when constant tension is adopted for coiling traditionally, after the torque of a core rod is increased along with the coiling diameter and reaches a peak value, a system cannot provide constant tension, and the coil loosening phenomenon occurs is solved.

Description

Technical Field

[0001] The invention relates to the technical field of steel coil production, and in particular to a steel coiling device capable of improving the flatness of steel coils and a control method thereof. Background Art

[0002] Steel coil, also known as coil steel, is formed into coils by hot pressing and cold pressing. The 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 the subsequent processing of hot-rolled coils. The weight of steel coils is generally about 15-30 tons. my country's hot rolling production capacity is constantly expanding. There are already dozens of hot rolling production lines, and some projects are about to be built or put into production. In order to facilitate storage and transportation, and facilitate various processing (such as processing into steel plates, steel strips, etc.), flat steel coils are usually used. After production and forming, a coiler is needed to reel them up.

[0003] When coiling, for example, when rolling high-strength thin-gauge strip steel such as HP345 and Q355, constant tension coiling is usually used. As the coil diameter increases, the mandrel torque reaches its peak value and the system can no longer provide constant tension, resulting in loose coiling. This leads to flat coil failure. At the same time, the inner ring collapses and cannot be flattened and finished, requiring additional manual processing, which increases labor intensity and production costs, affecting production efficiency and product quality. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the present invention provides a steel rolling device and a control method thereof that can improve the flat coiling of steel grades, which can prevent the strip from loosening and also prevent the inner ring from collapsing and being unable to be flattened and finished.

[0005] In order to solve the above technical problems and achieve the above technical effects, the present invention is implemented through the following technical solutions: The technical solution of the present invention is: a steel rolling device capable of improving the flat coiling of steel grades, comprising: a coiler, a coiling auxiliary assembly and a coiling mandrel; the coiling mandrel is arranged at the center of the coiler frame, and a driving motor for driving the coiling mandrel to rotate is arranged on the coiler frame, and the coiling auxiliary assembly is provided with three, and the three coiling auxiliary assemblies are arranged on the coiler frame with the coiling mandrel as the center and at intervals; each of the coiling auxiliary assemblies comprises a coiling auxiliary roller and a coiling auxiliary roller mounting plate, the tail end of each coiling auxiliary roller mounting plate is rotatably connected to the frame through a corresponding rotating shaft, and a reserved groove is opened on the inner wall of the head end of each coiling auxiliary roller mounting plate, and each coiling auxiliary roller can be rotatably mounted in the corresponding reserved groove about its own axis; each coiling auxiliary roller is parallel to the coiling mandrel, and each coiling auxiliary roller has a corresponding Driven by a variable speed motor; each of the auxiliary winding components is driven by a corresponding hydraulic cylinder to open and close relative to the winding mandrel, and a movable chamber for accommodating the rolled strip is formed between the three auxiliary winding components and the winding mandrel; the hydraulic cylinder includes a rodless chamber and a rod chamber, and the end of the hydraulic rod in the rod chamber is hinged to the outer wall of the head end of the corresponding auxiliary winding roller mounting plate, and the rodless chamber and the rod chamber are respectively provided with pressure sensors for detecting the oil pressure of the hydraulic cylinder, thereby realizing pressure detection and feedback of the auxiliary winding component, and then realizing pressure control of the auxiliary winding component through a pressure controller, and the rodless chamber is provided with a position sensor for detecting the displacement of the auxiliary winding component, thereby realizing displacement detection and feedback of the auxiliary winding component, and then realizing position control of the auxiliary winding component through a displacement controller.

[0006] Furthermore, the coiler also includes an upper pinch roller capable of feeding material, and the upper pinch roller and a single auxiliary winding roller mounting plate are provided with accelerometers capable of tracking the strip, and each auxiliary winding roller mounting plate is also provided with a limit switch capable of detecting the extreme opening position of the auxiliary winding assembly.

[0007] A steel rolling device and an operation method thereof capable of improving flat steel rolling, comprising the following steps: S0, initialization, before coiling the steel, the core shaft diameter of the coiling mandrel is recorded and preset as the actual core shaft diameter value of the coiling mandrel, and the roll gap value between the coiling auxiliary assembly and the coiling mandrel is specified according to the thickness value of the strip steel itself plus the space reserved value, so as to determine the space range of the active cavity, and then the hydraulic cylinder is started to open the coiling auxiliary assembly. When the coiling auxiliary 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 opening of the coiling auxiliary assembly, and combines the roll gap value to specify the minimum range value of the closed state of the coiling auxiliary assembly; S1, data preset, according to the maximum range value and the minimum range value, preset the initial winding and the middle and rear winding for the winding thickness; S2, the steel coil is fixed, the hot-rolled strip is sent into the active cavity through the upper feeding clamp roller, and the head of the strip is fixed on the surface of the coiling mandrel; S3, steel coil cooling, when the strip head is fixed on the coiling mandrel, manually open the cooling water of the coiling mandrel, by reducing the temperature of the connection between the strip and the coiling mandrel, so that the internal structure undergoes a phase change, so that the steel coil is not easy to loosen while ensuring sufficient rigidity; S4, coiling of the steel coil. After cooling, the driving motor on the coiler frame drives the coiling mandrel to rotate, and then the coiling mandrel rotates to coil the strip. During the coiling process, the hydraulic cylinder is started, and each hydraulic cylinder drives the corresponding coiling auxiliary component to close, pressing and fitting the steel coil to keep the coil tension and avoid loose coiling; S401, initial coiling. When the coiling mandrel just starts to coil the strip, the thickness of the steel coil is at the initial coiling stage. The system controls the oil pressure of the hydraulic cylinder through the controller, so that the coiling auxiliary assembly applies initial pressure to the steel coil. S402, winding stage 2, because during the winding process, the hydraulic cylinder will gradually drive the auxiliary winding component to open along with the thickness of the steel strip winding, so that the system can detect the moving distance data of the auxiliary winding component through the position sensor while maintaining the specified roll gap value, and increase the moving distance of the auxiliary winding component on the basis of the minimum range value, so as to obtain the thickness of the steel coil. When the thickness of the steel coil reaches the preset middle section winding, the system adjusts and corrects the pressure of the hydraulic cylinder through the controller, and the auxiliary winding component applies pressure to the steel coil in the middle and rear sections; S5. Winding is completed. After winding is completed, the material is left to stand in the winder for a period of time and then unloaded by adjusting the angle.

[0008] Furthermore, in step S0, when the hydraulic cylinder drives the auxiliary winding component to open continuously, after the auxiliary winding roller mounting plate reaches the specified position of the limit switch, the limit switch triggers the closing of the hydraulic cylinder. At this time, the auxiliary winding component is opened to the maximum range value, and the minimum range value is composed of the roller gap value plus the actual diameter value of the core shaft. The space reserved value can ensure that the strip can be smoothly wound without affecting the tension applied by the auxiliary winding component to the strip.

[0009] Furthermore, in step S1, the system combines the maximum range value and the minimum range value. When the coiling component is displaced with the minimum range value as a base point, the displacement distance of the coiling component is the thickness of the coiled steel.

[0010] Furthermore, in step S4, the pressure sensor and the position sensor perform real-time detection so that the system can observe in real time, wherein the position sensor calculates the actual roller gap value of the auxiliary winding assembly based on the actual diameter gauge of the core shaft of the winding mandrel and the displacement data of the auxiliary winding assembly, and the pressure sensor is used to calculate the actual pressure value of the auxiliary winding roller through pressure detection of the rod cavity and the rodless cavity.

[0011] Further, in step 401, the tension of the initial pressure application is 50-58 N / mm2; Furthermore, in step 402, the tension of the pressure applied in the middle and rear sections is 20-25 N / mm2.

[0012] Furthermore, in step S4, in order to ensure system stability, a pressure threshold value can be preset in the system. Only when the actual pressure reaches or exceeds this value will the system enter the next step. At the same time, a delay time is set to ensure that the system will not perform misoperation due to short-term pressure changes and pressure changes caused by operation fluctuations. Once the pressure threshold value and the delay time are both met, that is, the actual pressure reaches or exceeds the threshold value, and the preset delay time has passed, the system will start the constant pressure control set value. The constant pressure control set value is 100kN, and the calculation method is: constant pressure control set value = thickness × width × reserved value × unit tension, where the reserved value is 7.85, and the unit tension is the tension applied by the auxiliary winding component in the preset value. The system tracks the position of the strip through variables. The satisfaction of this condition will result in the RS trigger setting instruction, which can ensure that the constant pressure control set value will not be affected by fluctuations in 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 set value, the system will cancel the constant pressure control set value.

[0013] Furthermore, in step S5, after the coiling is completed, the direct unloading method after coiling is changed to manual unloading after an extension of 80 seconds, and the strip tail is manually adjusted 90° during unloading, so that the strip can self-repair into a circle under the action of gravity.

[0014] The beneficial technical effect of the present invention is: by changing the original constant tension winding mode of the system to segmented control, the front tension is corrected to 50~58N / square millimeter when the winding mandrel expands, and the tension in the middle and rear sections is corrected to 20~25N / square millimeter, so that during the forming process of the steel coil, the system can no longer provide constant tension after the mandrel torque reaches a peak value as the coil diameter increases, and the coil loosens, resulting in the problem of failure due to flat coils. At the same time, the direct unloading after the coiling is completed is changed to manual unloading after an extension of 80 seconds, and the strip tail is manually adjusted by 90° during unloading, so that the strip can repair itself into a circle under the action of gravity, avoiding the problem that the strip is removed just after it is coiled, resulting in a large force on the steel coil, resulting in the collapse of the inner ring and the inability to flatten and finish, and requiring additional manual processing to increase labor intensity and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a steel coiling device capable of improving the flat coiling of steel grades in the present invention; Figure 2It is a schematic diagram of double-loop control of a coiling aid roller assembly of a steel coiling device capable of improving flat coiling of steel grades in the present invention; Figure 3 It is a schematic flow chart of an operation method of a steel coiling device capable of improving the flat coiling of steel grades in the present invention; Figure 4 It is a typical curve diagram of constant pressure control of a steel coiling device that can improve the flat coiling of steel grades in the present invention.

[0016] The numbers and letters in the figure represent the corresponding component names: 1. Auxiliary winding assembly; 11. Auxiliary winding roller; 12. Auxiliary winding roller mounting plate; 13. Rotating shaft; 2. Hydraulic cylinder; 21. Rodless chamber; 22. Rod chamber; 3. Pressure sensor; 4. Position sensor; 5. Winding mandrel. DETAILED DESCRIPTION

[0017] In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0018] See attached Figure 1 As shown, a steel coiling device capable of improving the flat coiling of steel grades comprises a coiler, a coiling auxiliary assembly 1 and a coiling mandrel 5; the coiler further comprises an upper pinch roller capable of feeding materials, and the upper pinch roller and a single coiling auxiliary assembly plate 12 are both provided with an accelerometer capable of tracking the strip steel, and each coiling auxiliary assembly plate 12 is also provided with a limit switch capable of detecting the opening limit position of the coiling auxiliary assembly 1, the coiling mandrel 5 is arranged at the center of the coiler frame, and a driving motor for driving the coiling mandrel 5 to rotate is provided on the coiler frame, and the coiling auxiliary assembly 1 is provided with Three, three auxiliary winding components 1 are arranged on the frame of the winding machine with the winding mandrel 5 as the center and at intervals; each auxiliary winding component 1 includes a winding roller 11 and a winding roller mounting plate 12, the tail end of each winding roller mounting plate 12 is rotatably connected to the frame through a corresponding rotating shaft 13, and a reserved groove is opened on the inner wall of the head end of each winding roller mounting plate 12, and each winding roller 11 can be rotatably installed in its corresponding reserved groove around its own axis; each winding roller 11 is parallel to the winding mandrel 5, and each winding roller 11 is driven by a corresponding variable speed motor.

[0019] Before winding, the three winding auxiliary components 1 are in an open state, and then the strip head is fixed on the surface of the winding mandrel 5. After fixation, the three winding auxiliary components 1 are closed, and the driving motor drives the winding mandrel 5 to rotate, so that the winding mandrel 5 drives the strip to be wound. During the winding process, the winding auxiliary components 1 are attached to the surface of the wound strip to apply tension.

[0020] Each of the auxiliary winding components 1 is driven by a corresponding hydraulic cylinder 2 to open and close relative to the winding mandrel 5, and a movable chamber for accommodating the rolled strip is formed between the three auxiliary winding components 1 and the winding mandrel 5; the hydraulic cylinder 2 includes a rodless chamber 21 and a rod chamber 22, and the end of the hydraulic rod in the rod chamber 22 is hinged to the outer wall of the head end of the corresponding auxiliary winding roller mounting plate 12, and the rodless chamber 21 and the rod chamber 22 are respectively provided with a pressure sensor 3 for detecting the oil pressure of the hydraulic cylinder 2, so as to realize the control of the auxiliary winding components 1, and then the pressure control of the winding assembly 1 is realized through the pressure controller, and a position sensor 4 for detecting the displacement of the winding assembly 1 is arranged on the rodless chamber 21, so as to realize the displacement detection and feedback of the winding assembly 1, and then the position control of the winding assembly 1 is realized through the displacement controller, wherein the two pressure sensors 3 can detect the oil pressure of the hydraulic cylinder 2 in real time, so as to detect the tension generated when the strip is wound, and when the hydraulic cylinder 2 drives the winding assembly 1 to move, the position sensor 4 can detect the position of the winding assembly 1 in real time.

[0021] See also Figure 2 As shown, by analyzing the program, it can be known that the control structure of the winding auxiliary component is a double-loop control system, the outer loop is a position control loop, the inner loop is a pressure control loop, and the output of the position controller is the setting input of the pressure controller.

[0022] See attached Figure 3 As shown, a method for operating a steel coiling device capable of improving the flat coiling of steel grades comprises the following steps: S0, initialization, before coiling the steel, the core shaft diameter of the coiling mandrel 5 is recorded, and preset as the actual core shaft diameter value of the coiling mandrel 5, and the roll gap value between the coiling assembly 1 and the coiling mandrel 5 is specified according to the thickness value of the strip steel itself plus the space reserved value, so as to determine the spatial range of the active chamber, and then the hydraulic cylinder 2 is started to open the coiling assembly 1. When the coiling 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 assembly 1, and specifies the minimum range value of the closed state of the coiling assembly 1 in combination with the roll gap value. When the hydraulic cylinder 2 drives the coiling assembly 1 to continue to open, after the coiling roller mounting plate 12 reaches the specified position of the limit switch, the limit switch triggers the hydraulic cylinder 2 to close, and at this time the coiling assembly 1 is opened to the maximum range value, and the minimum range value is composed of the roll gap value plus the actual core shaft diameter value, wherein the space reserved value can ensure that the strip steel can be smoothly coiled without affecting the tension applied to the strip steel by the coiling assembly 1; S1, data preset, according to the maximum range value and the minimum range value, preset the initial winding and the middle and rear winding for the winding thickness, the system combines the maximum range value and the minimum range value, when the winding auxiliary component 1 moves with the minimum range value as the base point, the displacement distance of the winding auxiliary component 1 is the thickness of the coil; S2, the steel coil is fixed, the hot-rolled steel strip is sent into the active cavity through the upper feeding clamp roller, and the head of the steel strip 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 component 1 moves with the minimum range value as the base point, the displacement distance of the coiling component 1 is the thickness of the steel coil; S3, cooling of the steel coil. When the head of the steel strip is fixed on the coiling mandrel 5, the cooling water of the coiling mandrel 5 is manually turned on to reduce the temperature of the connection part between the steel strip and the coiling mandrel 5, thereby causing a phase change in the internal structure, so that the steel coil is not easy to loosen while ensuring sufficient rigidity; S4, coiling of the steel coil, after cooling, the driving motor on the coiling machine frame then drives the coiling mandrel 5 to rotate, and then the coiling mandrel 5 rotates to coil the strip. During the coiling process, the hydraulic cylinder 2 is started, and each hydraulic cylinder 2 drives the corresponding coiling assembly 1 to close, pressing and fitting the steel coil to keep the tension of the coiled steel and avoid loose coiling. The pressure sensor 3 and the position sensor 4 perform real-time detection so that the system can observe in real time, wherein the position sensor 4 calculates the actual roller gap value of the coiling assembly 1 according to the actual diameter gauge of the mandrel of the coiling mandrel 5 and the displacement data of the coiling assembly 1, and the pressure sensor 3 is used to calculate the actual pressure value of the coiling assembly 1 through the pressure detection of the rod cavity 22 and the rodless cavity 21; S401, initial coiling. When the coiling mandrel 5 starts to coil the steel strip, the thickness of the steel coil is at the initial coiling stage. The system controls the oil pressure of the hydraulic cylinder 2 through the controller, so that the coiling auxiliary component 1 applies initial pressure to the steel coil. The tension of the initial pressure is 50-58 N / mm2. S402, winding stage 2, because during the winding process, the hydraulic cylinder 2 will gradually drive the auxiliary winding component 1 to open along with the thickness of the steel strip winding, and while maintaining the specified roll gap value, the system can detect the moving distance data of the auxiliary winding component 1 through the position sensor 4, and increase the moving distance of the auxiliary winding component 1 on the basis of the minimum range value, so as to obtain the thickness of the steel coil. When the thickness of the steel coil reaches the preset middle section winding, the system adjusts and corrects the pressure of the hydraulic cylinder 2 through the controller, and the auxiliary winding component 1 applies pressure to the steel coil in the middle and rear sections, and the tension of the pressure in the middle and rear sections is 20~25N / square millimeter; S5. After coiling is completed, the strip is left to stand for a period of time in the coiler and then unloaded by adjusting the angle. The direct unloading after coiling is changed to manual unloading after 80 seconds, and the strip tail is manually adjusted 90° during unloading, so that the strip can self-repair into a circle under the action of gravity.

[0023] Furthermore, in step S4, in order to ensure the stability of the system, a pressure threshold value can be preset in the system. Only when the actual pressure reaches or exceeds this value, the system will enter the next step. At the same time, a delay time is set to ensure that the system will not be misoperated due to short-term pressure changes and pressure changes caused by operation fluctuations. Once the pressure threshold value and the delay time are both met, that is, the actual pressure reaches or exceeds the threshold value, and the preset delay time has passed, the system will start 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 × reserved value × unit tension, where the reserved value is 7.85, and the unit tension is the tension applied by the auxiliary winding component 1 in the preset value. The system tracks the position of the strip through variables. The satisfaction of this condition will result in the RS trigger setting instruction, 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. According to the above content optimization content, it can be divided into five steps: Step 1: Zero position calibration of the winding component 1 and check of the magnetic scale status. Perform zero position calibration and check whether the magnetic scale is damaged or the reading is inaccurate. If necessary, replace or calibrate the magnetic scale to ensure the initial position of the winding component 1 is accurate. The magnetic scale is a measuring element, and its status directly affects the accuracy of position control. Step 2: Check the status of pressure sensor 3 to see if it is working properly and verify if its reading is accurate. If necessary, calibrate or replace it. Step 3: Adjust the constant pressure control input conditions of the coiling component 1, analyze and modify the constant pressure control input conditions in the existing program, such as lowering the pressure threshold value and adjusting the delay time to adapt to the instantaneous fluctuation of the pressure, ensuring that the constant pressure control set value can be stably enabled when the strip position tracking conditions are met, which has the effect of optimizing the startup conditions of the constant pressure control and avoiding excessive pressure on the strip head; Step 4: Set the constant pressure setting value, set the constant pressure setting value of the coiling component 1 to 100kN, and ensure that the pressure remains constant during the entire operation; Step 5: Adjust the roll gap value of the position setting value of the coiling component 1. By making the actual roll gap between the coiling component 1 and the winding mandrel 5 consist of the strip thickness itself + the space reserved value (generally 8mm), it is ensured that even the thinnest strip can be effectively coiled without overpressure, so that it can ensure that the coiling component 1 can work normally under constant pressure control while avoiding excessive pressure on the strip.

[0024] See also Figure 4As shown in the figure, the roller gap and pressure curve of the typical constant pressure control of the coiling assembly 1 of the coiler. The constant pressure control of the coiling assembly 1 is enabled when the strip head is pressed, and the constant pressure control mode is entered. This control method can reduce the pressure shock generated during the position control of the coiling assembly 1. Because of the control of the pressure limit, the actual pressure of the coiling assembly 1 fluctuates around the constant pressure set value, which protects the safety of the equipment to a certain extent.

[0025] The method changes the original constant tension winding mode of the system into segmented control, and corrects the front tension to 50-58 N / mm2 when the winding mandrel 5 expands, and the tension in the middle and rear sections to 20-25 N / mm2, so that during the forming process of the steel coil, the system will not be unable to provide constant tension after the mandrel torque reaches a peak value as the coil diameter increases, resulting in loose coiling, which leads to the problem of failure due to flat coiling. At the same time, in step S5, the direct unloading method after coiling is changed to manual unloading after extending 80 seconds, which avoids the problem that the steel coil is removed just after the strip is coiled, resulting in greater force on the steel coil, resulting in the collapse of the inner ring and the inability to flatten and finish, and requiring additional manual processing to increase labor intensity and production cost.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A steel coiling device capable of improving the flatness of steel coils, characterized in that: include: A coiling machine, a coiling aid assembly (1) and a coiling mandrel (5); The winding mandrel (5) is arranged at the center of the winding machine frame, and a driving motor for driving the winding mandrel (5) to rotate is arranged on the winding machine frame. Three winding auxiliary components (1) are arranged, and the three winding auxiliary components (1) are arranged on the winding machine frame with the winding mandrel (5) as the center and spaced apart; each winding auxiliary component (1) comprises a winding auxiliary roller (11) and a winding auxiliary roller mounting plate (12); the tail end of each winding auxiliary roller mounting plate (12) is rotatably connected to the frame through a corresponding rotating shaft (13); a reserved groove is provided on the inner wall of the head end of each winding auxiliary roller mounting plate (12); each winding auxiliary roller (11) can be rotatably mounted in the corresponding reserved groove about its own axis; each winding auxiliary roller (11) is parallel to the winding mandrel (5), and each winding auxiliary roller (11) is driven by a corresponding variable speed motor; Each of the auxiliary winding components (1) is driven by a corresponding hydraulic cylinder (2) to open and close relative to the winding mandrel (5), and a movable chamber for accommodating the coiled strip is formed between the three auxiliary winding components (1) and the winding mandrel (5); the hydraulic cylinder (2) comprises a rodless chamber (21) and a rod chamber (22), and the end of the hydraulic rod in the rod chamber (22) is hinged to the outer wall of the head end of the corresponding auxiliary winding roller mounting plate (12); the rodless chamber (21) and the rod chamber (22) are respectively provided with a pressure sensor (3) for detecting the oil pressure of the hydraulic cylinder (2), so as to realize pressure detection and feedback of the auxiliary winding component (1), and then realize pressure control of the auxiliary winding component (1) through a pressure controller; and the rodless chamber (21) is provided with a position sensor (4) for detecting the displacement of the auxiliary winding component (1), so as to realize displacement detection and feedback of the auxiliary winding component (1), and then realize position control of the auxiliary winding component (1) through a displacement controller.

2. The steel coiling device capable of improving the flatness of steel coils according to claim 1, characterized in that: The coiler also includes an upper pinch roller capable of feeding material, and the upper pinch roller and a single auxiliary coiling roller mounting plate (12) are both provided with an accelerometer capable of tracking the strip steel, and each auxiliary coiling roller mounting plate (12) is also provided with a limit switch capable of detecting the opening extreme position of the auxiliary coiling assembly (1).

3. An operating method for a steel coiling device capable of improving the flat coiling of a steel grade according to any one of claims 1 to 2, characterized in that: The following steps are involved: S0, initialization, before coiling the steel, the core shaft diameter of the coiling mandrel (5) is recorded and preset as the actual core shaft diameter value of the coiling mandrel (5), and the roll gap value between the coiling auxiliary component (1) and the coiling mandrel (5) is specified based on the thickness value of the steel strip itself plus the space reserved value, thereby determining the spatial range of the active cavity, and then starting the hydraulic cylinder (2) to open the coiling auxiliary component (1). When the coiling auxiliary component (1) is opened to the range specified by the limit switch, the limit switch closes the hydraulic cylinder (2), thereby allowing the position sensor (4) to obtain and record the maximum range value of the opening of the coiling auxiliary component (1), and in combination with the roll gap value, the minimum range value of the closed state of the coiling auxiliary component (1) is specified; S1, data preset, according to the maximum range value and the minimum range value, preset the initial winding and the middle and rear winding for the winding thickness; S2, the steel coil is fixed, the hot-rolled steel strip is fed into the movable cavity through the upper feeding clamping roller, and the head of the steel strip is fixed on the surface of the coiling mandrel (5); S3, cooling the steel coil. When the head of the steel strip is fixed on the coiling mandrel (5), the cooling water of the coiling mandrel (5) is manually turned on to reduce the temperature of the connection between the steel strip and the coiling mandrel (5), thereby causing a phase change in the internal structure, thereby ensuring that the steel coil has sufficient rigidity and is not easy to loosen; S4, the steel coil is coiled and cooled, and then the driving motor on the coiler frame drives the coiling mandrel (5) to rotate, and then the coiling mandrel (5) rotates to coil the steel strip. During the coiling process, the hydraulic cylinder (2) is started, and each hydraulic cylinder (2) drives the corresponding coiling auxiliary component (1) to close, so as to press and fit the steel coil, so that the steel coil maintains tension and avoids loose coiling. In order to ensure the stability of the system, a pressure threshold value can be preset in the system. Only when the actual pressure reaches or exceeds this value, the system will enter the next step. At the same time, a delay time is set to ensure that the system will not be misoperated due to short-term pressure changes and pressure changes caused by operation fluctuations. Once the pressure threshold value and the delay time are exceeded, the system will enter the next step. When all the conditions are met at the same time, that is, the actual pressure reaches or exceeds the threshold value, and the preset delay time has passed, the system will start the constant pressure control set value, which is 100kN and is calculated as follows: constant pressure control set value = thickness × width × reserved value × unit tension, where the reserved 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 through variables. When this condition is met, the RS trigger will set the instruction, which can ensure that the constant pressure control set 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 set value, the system will cancel the constant pressure control set value. S401, initial coiling. When the coiling mandrel (5) starts to coil the steel strip, the thickness of the steel coil is at the initial coiling stage. The system controls the oil pressure of the hydraulic cylinder (2) through the controller, so that the coiling auxiliary component (1) applies initial pressure to the steel coil. The tension of the initial pressure is 50-58 N / mm2. S402, winding stage 2, because during the winding process, the hydraulic cylinder (2) will gradually drive the auxiliary winding component (1) to open according to the thickness of the steel strip winding, while maintaining the specified roller gap value, so that the system can detect the moving distance data of the auxiliary winding component (1) through the position sensor (4), and increase the moving distance of the auxiliary winding component (1) on the basis of the minimum range value, so as to obtain the thickness of the steel coil. When the thickness of the steel coil reaches the preset middle section of winding, the system adjusts and corrects the pressure of the hydraulic cylinder (2) through the controller, and the auxiliary winding component (1) applies pressure to the steel coil in the middle and rear sections, and the tension of the pressure in the middle and rear sections is 20-25N / mm2; S5. Winding is completed. After winding is completed, the material is left to stand in the winder for a period of time and then unloaded by adjusting the angle.

4. The method for operating a steel coiling device capable of improving flat steel coiling according to claim 3, characterized in that: In step S0, when the hydraulic cylinder (2) drives the auxiliary winding component (1) to continue to open, after the auxiliary winding 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 auxiliary winding component (1) is opened to the maximum range value, and the minimum range value is composed of the roller gap value plus the actual diameter value of the mandrel. The space reserved value can ensure that the strip can be smoothly wound without affecting the tension applied to the strip by the auxiliary winding component (1).

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

6. The method for operating a steel coiling device capable of improving flat steel coiling according to claim 3, characterized in that: In step S4, the pressure sensor (3) and the position sensor (4) perform real-time detection so that the system can observe in real time, wherein the position sensor (4) calculates the actual roller gap value of the auxiliary winding assembly (1) based on the data of the actual core shaft diameter gauge of the winding mandrel (5) and the displacement of the auxiliary winding assembly (1), and the pressure sensor (3) is used to calculate the actual pressure value of the auxiliary winding assembly (1) through the pressure detection of the rod cavity (22) and the rodless cavity (21).

7. The method for operating a steel coiling device capable of improving flat steel coiling according to claim 3, characterized in that: In step S5, after the coiling is completed, the direct unloading method after coiling is changed to manual unloading after an extension of 80 seconds, and the strip tail is manually adjusted 90° during unloading, so that the strip can self-restore into a circle under the action of gravity.

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