A kind of steel rolling tension control equipment

Abstract

The utility model relates to the field of variety steel rolling technology, especially a variety steel continuous rolling tension control device, including frame, both sides of frame all are installed with support frame, two guide rails are installed in the top of both sides of frame inner wall. The utility model has the advantages of setting up frame, four guide rails, four sliding blocks, first roller and second roller, two first hydraulic cylinders and two second hydraulic cylinders elongation action, promote the first roller and second roller of upper side to move to below, four laser range finders carry out the measurement to four sliding blocks's height position simultaneously, carry out the processing to the data correlation through control panel, are used for controlling two first hydraulic cylinders and two second hydraulic cylinders to elongate or shorten, promote adjacent two first rollers and adjacent two second rollers keep relative level, avoid appearing one side high one side low's phenomenon, realize the purpose of even rolling to variety steel, avoid appearing the phenomenon that variety steel is not even rolled.

Description

Technical Field

[0001] This utility model relates to the field of specialty steel rolling technology, and in particular to a tension control device for continuous rolling of specialty steel. Background Technology

[0002] Tension control in continuous rolling of specialty steel is a core technology in the continuous rolling process. During continuous rolling, it is necessary to ensure that the metal flow rate per second between adjacent stands is equal. Dynamic balance is achieved by adjusting the mill speed to match the elongation coefficient. Tension control can suppress the fluctuation of the head and tail dimensions of the rolled piece (the fluctuation of the roughing width is controlled within 2%). It can also compensate for uneven elongation of the rolled piece by adjusting the tension distribution, prevent steel piling and strip breakage accidents, and maintain the dynamic balance of continuous rolling under disturbances such as steel temperature fluctuations and material differences. It is particularly suitable for the complex working conditions of high-strength specialty steel.

[0003] In traditional continuous rolling processes for specialty steels, it is not convenient to balance and adjust the parallelism between rolls as needed, which leads to deviations in the rolling pressure control of specialty steels and results in uneven rolling. Based on this, a tension control device for continuous rolling of specialty steels is proposed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a tension control device for continuous rolling of specialty steel, which effectively solves the deficiencies of the prior art.

[0005] To achieve the above objectives, one embodiment of this utility model provides a tension control device for continuous rolling of specialty steel, including a frame. Support frames are installed on both sides of the frame. Two guide rails are installed at the top of both sides of the inner wall of the frame. Slider blocks are slidably installed inside each of the four guide rails. A first roll and a second roll are rotatably installed between the middle of the inner wall of the frame and the four sliders. Two first hydraulic cylinders and two second hydraulic cylinders are installed on both sides of the top wall of the frame, and their output ends are fixedly connected to the top of the sliders. Two drive motors are installed in the middle of one side of the frame, and their output ends are fixedly connected to the first roll and the second roll at the bottom. Two laser rangefinders are installed in the middle of both sides of the inner wall of the frame, all facing the bottom of the sliders. Multiple support rollers are rotatably installed at the top of the two support frames.

[0006] Preferably, in any of the above schemes, a control box is installed on one side of the top surface of the frame. The control box is equipped with a control panel and a PLC. The four laser ranging sensors are electrically connected to the control panel via wires. The control panel is installed at the closed door of the control box, and indicator lights are also installed on the closed door of the control box. The control panel is a touch screen control panel.

[0007] I. Control Principle of Touch Control Panel

[0008] Human-machine interface: The touch screen serves as the host computer operation interface, carrying out parameter setting, status monitoring and fault alarm functions. It sends instructions to the PLC or controller through the graphical interface (such as setting the target displacement of the hydraulic cylinder, tension threshold, etc.).

[0009] Data visualization processing

[0010] It displays real-time measured values ​​from laser sensors (such as strip position deviation and thickness change) and dynamic parameters of hydraulic cylinders (pressure and displacement curves), and supports historical data retrieval and analysis.

[0011] II. Detection Principle of Laser Distance Sensor

[0012] Non-contact measurement mechanism

[0013] Using laser triangulation or the time-of-flight (ToF) principle, a laser beam is emitted and the reflected signal is received to calculate the position or thickness change of a target object with an accuracy down to the micrometer level.

[0014] Dynamic feedback adjustment

[0015] The detection data is transmitted to the controller via analog or digital signals (such as 4-20mA, EtherCAT), forming the core input source of the closed-loop control system. Typical applications include:

[0016] Strip edge position detection (to prevent deviation)

[0017] Online monitoring of rolled piece thickness (in conjunction with an AGC system)

[0018] III. Hydraulic Cylinder Actuation Control Principle

[0019] Electro-hydraulic servo drive

[0020] The hydraulic cylinder is driven by a servo valve. The controller generates a PWM signal based on the deviation between the target value and the feedback from the sensor, and adjusts the valve core opening to control the hydraulic oil flow and pressure, thereby achieving precise displacement of the cylinder rod.

[0021] Multi-parameter coordinated response

[0022] Displacement control: The built-in LVDT displacement sensor monitors the piston position in real time, and the PID algorithm is used to eliminate steady-state errors (such as roll gap adjustment in strip mills).

[0023] Pressure control: The pressure difference across the piston is detected by a pressure transmitter and converted into a tension / pressure value to participate in the system closed loop (such as dynamic compensation of looper tension).

[0024] Preferably, in any of the above schemes, the outer diameter of the two first rolls is larger than that of the second roll, and both ends of the outer walls of the two first rolls and the second roll are provided with stepped protrusions. By using this scheme, it is easy to make the middle of the first roll and the second roll recessed inward and form a stepped structure at both ends, which facilitates the rolling and limiting of the grade steel. At the same time, the reduction rate of the first roll ≥% achieves austenite grain breakage, the final rolling temperature control of the second roll (≤850℃) triggers the phase transformation strengthening effect, and the dynamic roll shifting technology (such as segmented cooling and hydraulic bending roll) is used to correct the thermal crown of the roll and compensate for the deflection deformation caused by the rolling force.

[0025] Preferably, one of the above-mentioned solutions has a holding tank installed in the middle of the support frame, with one end placed at an angle downwards. This solution facilitates the handling of scale and rinsing water removed during rinsing. Due to the angled shape of the holding tank, it is easy to guide the water and scale, and easy to recycle and reuse the rinsing water.

[0026] Preferably, in any of the above embodiments, a water tank is provided on the side of the frame near the holding tank, a removable filter screen is installed at the top of the inner wall of the water tank, and a pump is installed at one corner of the side of the water tank. In this embodiment, the filter screen facilitates the filtration of oxide scale mixed in the water, and the water tank facilitates the temporary storage of recycled water, which can be easily extracted by the pump later for recycling.

[0027] Preferably, in any of the above solutions, two guide pipes are installed on the side of one of the support frames near the holding tank. Multiple water outlets are installed on the sides of both guide pipes, and the multiple water outlets face the gap between adjacent support rollers. By using this solution, the rinsing water can flow out from multiple water outlets, so that the rinsing water impacts the upper and lower surfaces of the steel. The water will boil at high temperature and generate a large number of bubbles, which will lift up the oxide scale. At the same time, the scale will flow into the interior of the holding tank with the water flow, reducing the iron oxide scale intrusion rate and reducing surface pitting.

[0028] Preferably, one of the above-mentioned solutions is that a liquid pump is installed on one side of one of the support frames. The output end of the liquid pump is connected to two guide pipes through a water pipe. This solution facilitates the provision of pumping pressure for the water outlet. The input end of the liquid pump is connected to an external water source through a water pipe, thereby facilitating the provision of a sufficient water source. When the liquid pump is powered on, the external water is pumped into the two guide pipes, thereby increasing the water pressure and giving the water flowing out of the outlet a higher pressure, so as to impact the oxide scale.

[0029] This utility model has the following advantages:

[0030] 1. This type of tension control equipment for continuous rolling of specialty steel comprises a frame, four guide rails, four sliders, a first roll, and a second roll. Two first hydraulic cylinders and two second hydraulic cylinders extend to push the upper first roll and the second roll downwards. Simultaneously, four laser rangefinders measure the height of the four sliders. The data is processed through a control panel to control the extension or retraction of the two first hydraulic cylinders and the two second hydraulic cylinders. This ensures that adjacent first rolls and adjacent second rolls remain relatively horizontal, preventing uneven rolling and achieving uniform rolling of the specialty steel.

[0031] 2. This type of tension control equipment for continuous rolling of specialty steel uses two support frames with multiple support rollers rotatably mounted on their tops. This facilitates uniform support of long-length specialty steel, allowing it to pass sequentially through the first and second rolls. A liquid pump is installed, with its output end connected to two guide pipes via water pipes. When the liquid pump is powered on, it pumps water to multiple outlets for spraying, thereby washing away the oxide scale on the top and bottom surfaces of the specialty steel and preventing interference with subsequent rolling processes. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0033] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0034] Figure 3 This is a schematic diagram of the assembly structure of the frame and support frame of this utility model;

[0035] Figure 4 This is a schematic diagram of the frame structure of this utility model;

[0036] Figure 5 This is a schematic diagram showing the positional structure of the first and second rolls of this utility model.

[0037] In the diagram: 1-Frame, 2-Pump, 3-Support frame, 4-Filter screen, 5-Water tank, 6-Liquid pump, 7-Outlet, 8-Tank, 9-Support roller, 10-Guide pipe, 11-Slider, 12-Guide rail, 13-First hydraulic cylinder, 14-Second hydraulic cylinder, 15-Control box, 16-First roll, 17-Second roll, 18-Drive motor, 19-Laser rangefinder sensor. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0039] like Figures 1 to 5 As shown, a tension control device for continuous rolling of various steel grades includes a frame 1. Support frames 3 are installed on both sides of the frame 1. Two guide rails 12 are installed at the top of each of the four inner walls of the frame 1. Sliding blocks 11 are slidably installed inside each of the four guide rails 12. First rolls 16 and second rolls 17 are rotatably installed between the middle of the inner wall of the frame 1 and the four sliding blocks 11. Two first hydraulic cylinders 13 and two second hydraulic cylinders 14 are installed on both sides of the top wall of the frame 1, and their output ends are fixedly connected to the top of the sliding blocks 11. Two drive motors 18 are installed in the middle of one side of the frame 1. The output ends are fixedly connected to the first roll 16 and the second roll 17 at the bottom, respectively. Two laser rangefinders 19 are installed in the middle of both sides of the inner wall of the frame 1, and all four face the bottom of the slider 11. Multiple support rollers 9 are rotatably installed on the top of the two support frames 3. The top side of the outer wall of the multiple support rollers 9 is at the same height as the top side of the outer wall of the first roll 16 and the second roll 17 at the bottom, which facilitates uniform support for the steel. At the same time, the first roll 16 and the second roll 17 cooperate to overcome the stress after rolling, which makes it easier to keep the rolled steel relatively horizontal and avoid large bending.

[0040] A control box 15 is installed on one side of the top surface of the frame 1. The control box 15 is equipped with a control panel and a PLC. Four laser rangefinders 19 are electrically connected to the control panel through wires. As an optional technical solution of this utility model, the control panel is installed at the closed door position of the control box 15. At the same time, indicator lights are also installed on the closed door of the control box 15. The control panel adopts a touch screen control panel.

[0041] I. Control Principle of Touch Control Panel

[0042] Human-machine interface: The touch screen serves as the host computer operation interface, carrying out parameter setting, status monitoring and fault alarm functions. It sends instructions to the PLC or controller through the graphical interface (such as setting the target displacement of the hydraulic cylinder, tension threshold, etc.).

[0043] Data visualization processing

[0044] It displays real-time measured values ​​from laser sensors (such as strip position deviation and thickness change) and dynamic parameters of hydraulic cylinders (pressure and displacement curves), and supports historical data retrieval and analysis.

[0045] II. Detection Principle of Laser Distance Sensor

[0046] Non-contact measurement mechanism

[0047] Using laser triangulation or the time-of-flight (ToF) principle, a laser beam is emitted and the reflected signal is received to calculate the position or thickness change of a target object with an accuracy down to the micrometer level.

[0048] Dynamic feedback adjustment

[0049] The detection data is transmitted to the controller via analog or digital signals (such as 4-20mA, EtherCAT), forming the core input source of the closed-loop control system. Typical applications include:

[0050] Strip edge position detection (to prevent deviation)

[0051] Online monitoring of rolled piece thickness (in conjunction with an AGC system)

[0052] III. Hydraulic Cylinder Actuation Control Principle

[0053] Electro-hydraulic servo drive

[0054] The hydraulic cylinder is driven by a servo valve. The controller generates a PWM signal based on the deviation between the target value and the feedback from the sensor, and adjusts the valve core opening to control the hydraulic oil flow and pressure, thereby achieving precise displacement of the cylinder rod.

[0055] Multi-parameter coordinated response

[0056] Displacement control: The built-in LVDT displacement sensor monitors the piston position in real time, and the PID algorithm is used to eliminate steady-state errors (such as roll gap adjustment in strip mills).

[0057] Pressure control: The pressure difference across the piston is detected by a pressure transmitter and converted into a tension / pressure value to participate in the system closed loop (such as dynamic compensation of looper tension).

[0058] The outer diameters of the two first rolls 16 are larger than the outer diameter of the second roll 17. Both ends of the outer walls of the two first rolls 16 and the second roll 17 are provided with stepped protrusions. As an optional technical solution of this utility model, this facilitates the inward indentation of the middle of the first rolls 16 and the second rolls 17 and the formation of a stepped structure at both ends, which facilitates the rolling and positioning of specialty steel. At the same time, the reduction rate of the first roll 16 is ≥50% to achieve austenite grain breakage, and the final rolling temperature control of the second roll 17 (≤850℃) triggers the phase transformation strengthening effect. Dynamic roll shifting technology (such as segmented cooling and hydraulic bending rolls) is used to correct the thermal crown of the rolls and compensate for the deflection deformation caused by the rolling force.

[0059] A holding tank 8 is installed in the middle of a support frame 3, with one end tilted downwards. As an optional technical solution of this utility model, this facilitates the handling of the oxide scale and rinsing water that have been washed off. Due to the tilted shape of the holding tank 8, it is easy to guide the water and oxide scale, and easy to recycle and reuse the rinsing water.

[0060] A water tank 5 is provided on the side of the frame 1 near the holding tank 8. A removable filter screen 4 is installed at the top of the inner wall of the water tank 5. A pump 2 is installed at one corner of the side of the water tank 5. As an optional technical solution of this utility model, the filter screen 4 is convenient for filtering out oxide scale mixed in the water. At the same time, the water tank is convenient for temporarily storing the recycled water, which is convenient for later extraction by the pump 2 for later recycling.

[0061] Two guide pipes 10 are installed on one side of a support frame 3 near the holding tank 8. Multiple water outlets 7 are installed on the sides of the two guide pipes 10. The multiple water outlets 7 face the gap between adjacent support rollers 9. As an optional technical solution of this utility model, this makes it easy for the rinsing water to flow out from the multiple water outlets 7, so that the rinsing water impacts the upper and lower surfaces of the steel. The water will boil at high temperature and generate a large number of bubbles, which will lift up the oxide scale. At the same time, it will flow into the interior of the holding tank 5 with the water flow, reducing the iron oxide scale intrusion rate and reducing surface pitting.

[0062] A liquid pump 6 is installed on one side of a support frame 3. The output end of the liquid pump 6 is connected to two guide pipes 10 through a water pipe. As an optional technical solution of this utility model, this facilitates the provision of pumping pressure for the water outlet 7. The input end of the liquid pump 6 is connected to an external water source through a water pipe, thereby facilitating the provision of a sufficient water source. When the liquid pump 6 is powered on, the external water is pumped into the two guide pipes 10, and the water pressure is increased at the same time, so that the water flowing out of the outlet 7 has a higher pressure, so as to impact the oxide scale.

[0063] The following steps are required when using this type of steel continuous rolling tension control equipment:

[0064] 1) The specialty steel enters from the direction close to the first roll 16. The liquid pump 6 is powered on and runs, spraying water through multiple outlets 7 to wash the oxide scale on the top and bottom surfaces of the specialty steel.

[0065] 2) Input data through the control panel to control the extension action of the two first hydraulic cylinders 13 and the two second hydraulic cylinders 14, while the laser distance sensor 19 measures the descent height of the four sliders 11.

[0066] 3) When the four sliders 11 reach the specified distance, the laser distance sensor 19 sends a signal to the control panel. The control panel processes the data and simultaneously controls the two first hydraulic cylinders 13 and the two second hydraulic cylinders 14 to stop running and maintain this distance through the PLC.

[0067] 4) The adjacent first roll 16 and the adjacent second roll 17 are kept relatively horizontal to ensure the uniformity of the rolling of the special steel and avoid the phenomenon of uneven thickness.

[0068] In summary, during operation, the user sets up a frame 1, four guide rails 12, four sliders 11, a first roll 16, and a second roll 17. The two first hydraulic cylinders 13 and two second hydraulic cylinders 14 extend, pushing the upper first roll 16 and second roll 17 downwards. Simultaneously, four laser rangefinders 19 measure the height of the four sliders 11. The control panel processes this data to control the extension or retraction of the two first hydraulic cylinders 13 and two second hydraulic cylinders 14, ensuring that adjacent first rolls 16 and adjacent second rolls 17 remain relatively horizontal, avoiding... To prevent uneven rolling of the specialty steel, two support frames 3 are installed, with multiple support rollers 9 rotatably mounted on their tops. This facilitates uniform support of the long specialty steel, allowing it to pass sequentially through the first roller 16 and the second roller 17. A liquid pump 6 is installed, with its output end connected to two guide pipes 10 via a water pipe. When the liquid pump 6 is powered on, water is pumped to multiple outlets 7 for spraying, thereby washing away the oxide scale on the top and bottom surfaces of the specialty steel and preventing interference with subsequent rolling processes.

[0069] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tension control device for continuous rolling of specialty steel, characterized in that: The machine includes a frame (1), on both sides of which a support frame (3) is installed. Two guide rails (12) are installed at the top of both sides of the inner wall of the frame (1). Slider blocks (11) are slidably installed inside the four guide rails (12). A first roll (16) and a second roll (17) are rotatably installed between the middle of the inner wall of the frame (1) and the four sliders (11). Two first hydraulic cylinders (13) and two second hydraulic cylinders (14) are installed on both sides of the top wall of the frame (1). The output ends of the four are fixedly connected to the top of the slider (11). Two drive motors (18) are installed in the middle of one side of the frame (1). The output ends of the two drive motors (18) are fixedly connected to the first roller (16) and the second roller (17) at the bottom. Two laser rangefinders (19) are installed in the middle of both sides of the inner wall of the frame (1), and the four are facing the bottom of the slider (11). Multiple support rollers (9) are rotatably installed on the top of the two support frames (3).

2. The tension control equipment for continuous rolling of specialty steel according to claim 1, characterized in that: A control box (15) is installed on one side of the top surface of the frame (1). The control box (15) is equipped with a control panel and a PLC. The four laser rangefinders (19) are electrically connected to the control panel through wires.

3. The tension control equipment for continuous rolling of specialty steel according to claim 2, characterized in that: The outer diameter of the two first rolls (16) is larger than the outer diameter of the second roll (17), and stepped protrusions are provided at both ends of the outer walls of the two first rolls (16) and the second roll (17).

4. The tension control equipment for continuous rolling of specialty steel according to claim 3, characterized in that: A container (8) is installed in the middle of one of the support frames (3), with one end of it tilted downwards.

5. The tension control equipment for continuous rolling of specialty steel according to claim 4, characterized in that: A water tank (5) is provided on the side of the frame (1) near the container (8). A removable filter screen (4) is installed on the top of the inner wall of the water tank (5). A pump (2) is installed at one corner of the side of the water tank (5).

6. The tension control equipment for continuous rolling of specialty steel according to claim 5, characterized in that: Two guide pipes (10) are installed on one side of the support frame (3) near the container (8). Multiple water outlets (7) are installed on the sides of both guide pipes (10), and the multiple water outlets (7) face the gap between adjacent support rollers (9).

7. The tension control equipment for continuous rolling of specialty steel according to claim 6, characterized in that: A liquid pump (6) is installed on one side of one of the support frames (3), and the output end of the liquid pump (6) is connected to two guide pipes (10) through a water pipe.

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