Linear adjustment method for cross-section position of tension leveler

Abstract

This invention discloses a method for linearly adjusting the position of the cross-section changing section of a straightening machine, comprising the following steps: S1, collecting position data of the upper roller of the straightening machine and establishing a position monitoring model for the straightening system; S2, adjusting the operating process of the oil supply valve of the hydraulic cylinder connected to the upper roller of the straightening machine to linearly control the position of the upper roller of the straightening machine; wherein, a position detection device is set to collect the position data of the upper roller of the straightening machine, and an oil pressure detection device is set to collect the working pressure of the hydraulic cylinder. The linear adjustment method for the position of the cross-section changing section of the straightening machine of this invention, by real-time detection of the operating position data of the upper roller of the straightening machine, constructs a position monitoring model for the straightening system, compiles an intelligent linear adjustment model for the position of the cross-section changing section, and coordinates with real-time position monitoring data to precisely adjust the operating speed of the hydraulic valve for the cross-section changing section, thereby achieving stable and uniform control of the upper roller position fluctuations caused by the cross-section changing section, ensuring the long-term safe and stable operation of the continuous casting straightening system, and achieving the goal of long service life of the continuous casting straightening system.

Description

Technical Field

[0001] This invention belongs to the field of tension leveling machine technology. Specifically, this invention relates to a method for linear adjustment of the cross-sectional position of a tension leveling machine. Background Technology

[0002] Large-section continuous casting machines are a core component of steel production and the most effective alternative to ingot casting. With the rapid development of my country's steel industry, high-end manufacturing demands increasingly larger cross-sections, leading to continuous increases in the pressing force and casting speed of equipment.

[0003] When the tension leveler changes its cross-section, the opening changes from 600mm to 1200mm, the pressing force is 200t, and the tensioning speed changes from 0.08 to 0.35m / min. The corresponding risk of positional deviation also increases sharply. The tension leveling system may experience serious accidents such as hydraulic cylinder displacement damage, frame top plate twisting and deformation, lifting slide cracking and falling off, reduction motor crushing and breaking, dummy bar jamming, and red billet stagnation. The stable operation of the tension leveler is directly related to low-carbon metallurgy.

[0004] With the continuous development of intelligent manufacturing, the application of precision control technology to collect real-time and accurate data on the position fluctuation of the straightening roller, analyze the correspondence between position fluctuation and oil supply valve action, develop the switching action curve of the section-changing valve, and realize intelligent linear control of the section-changing position, has become an urgent need for achieving high-quality and inherently safe continuous casting systems.

[0005] Patent document CN112008055A discloses a positioning detection system and method for a continuous casting dummy bar. The system includes a position monitoring unit, a laser projection unit, an image detection unit, and an image processing unit. The position monitoring unit calculates the incremental displacement of the conveyor roller rotation in each sampling cycle, accumulates the incremental displacement to continuously track and calibrate the coordinate position of the dummy bar. The laser projection unit projects an auxiliary positioning laser onto the dummy bar and reflects it to the image detection unit. The image detection unit detects the image formed by the laser, processes the image, and forms digital image information. The image processing unit receives the digital image information from the image detection unit, analyzes and processes the digital image information according to the coordinate position of the position monitoring unit, and sends a dummy bar head and tail positioning signal to the position monitoring unit. This application can automatically calibrate the positioning detection error of the dummy bar in a multi-strand continuous casting machine, and has the advantages of high accuracy, stability, reliability, maintenance-free operation, and low cost. However, the application did not solve the problem of position detection of the upper roller of the straightening machine, nor did it have a real-time position control model. It could not realize position monitoring of the straightening machine when it was in the inclined section of the derrick and start / stop control of the hydraulic valve. The straightening machine still had the risk of damage caused by the asynchronous hydraulic cylinders.

[0006] Patent document CN201653361U discloses a bobbin position detection device. This device includes a bobbin and photoelectric switches. Two in-situ detection through-holes are provided in the middle of the bobbin, and a bobbin detachment detection through-hole is provided on the bob body near the free end. Four photoelectric switches are used, arranged in pairs, positioned above and below the in-situ detection through-holes, with opposing photoelectric switches on the same vertical line. This invention has a simple structure and can improve the position detection accuracy to over 99%, significantly improving the accuracy of bobbin position detection while greatly reducing maintenance workload, making it almost maintenance-free, resulting in significant indirect benefits. The purpose of this application is to provide a bobbin position detection device that is not only simple in structure but also can quickly and accurately detect the position of the bobbin, preventing bobbin detachment, reducing the false alarm rate, and facilitating inspection and maintenance. However, the application did not detect the actual position of the upper roller of the tension leveler, which could not solve the problem of possible deviations in the actual position of the tension leveler and the guide bar, and could not effectively control the actual position of the upper roller of the tension leveler.

[0007] Patent document CN209491324U discloses a device for detecting the actual position of a continuous casting silver roller conveyor. It includes an upper drive roller conveyor and a lower drive roller conveyor arranged at vertical intervals. A partition wall is installed on one side of each roller conveyor, and a motor base is installed on the back of the partition wall. An upper drive motor and a lower drive motor are arranged at vertical intervals on the motor base. One end of the shafts of the upper and lower drive motors are connected to the upper and lower drive silver roller conveyors respectively via universal couplings. A proximity switch connected to the control unit of the drive motor is installed on the back of the partition wall above the drive motor shaft. This application can prevent equipment failures caused by premature or delayed pressing of the actual position of the drive roller conveyor, improve the service life of the continuous casting sector section, reduce the failure rate of the ingot feeding, and reduce the labor intensity of personnel. However, this application cannot perform position tracking for the leveling machine's cross-section change. Summary of the Invention

[0008] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides a method for linearly adjusting the cross-sectional position of a straightening machine, with the purpose of achieving stable and uniform control of the fluctuation in the derrick cross-section caused by the cross-sectional change, ensuring the long-term safe and stable operation of the straightening machine system, and achieving the goal of long service life for the continuous casting machine.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is: a method for linear adjustment of the cross-sectional position of a tension leveling machine, comprising the following steps:

[0010] S1. Collect the position data of the upper roller of the tension leveler and establish a position monitoring model of the tension leveling system;

[0011] S2. Adjust the operation of the oil supply valve of the hydraulic cylinder connected to the upper roller of the tension leveler to linearly control the position of the upper roller of the tension leveler;

[0012] Specifically, a position detection device is used to collect the position data of the upper roller of the tension leveler, and an oil pressure detection device is used to collect the working pressure of the hydraulic cylinder.

[0013] The position detection device includes a position sensor, which is electrically connected to the control system.

[0014] The position detection device further includes a measuring reference base, an upper sensor base, and a lower base. The position sensor is disposed on the lower base, the lower base is disposed on the measuring reference base, the upper sensor base is located above the lower base, and the measuring reference base is disposed on the upper roller.

[0015] The upper base of the sensor is mounted on the crossbeam of the frame by a first bolt, the position sensor is mounted on the lower base by a second bolt, and the lower base is mounted on the measuring reference base by a third bolt.

[0016] The lower base is provided with a second mounting hole through which the second bolt passes. The second mounting hole is a waist-shaped hole.

[0017] The lower base is provided with a third mounting hole for the third bolt to pass through, and the third mounting hole is a waist-shaped hole.

[0018] The position sensor is a laser rangefinder.

[0019] Two hydraulic cylinders and two position detection devices are provided. The two position detection devices are located at both ends of the upper roller, and the two hydraulic cylinders are located between the two position detection devices.

[0020] Step S2 includes:

[0021] S201. Set the data acquisition cycle for the upper roller position of the tension leveler to N seconds;

[0022] S202, Calculate the linear control position of the upper roller ΔS = (S 头 -S 直 ) / T, where T is the travel time of the upper roller in the inclined section of the derrick, and S 直 S represents the position of the upper roller when it is in the straight section of the derrick. 头 This refers to the position value of the spindle head;

[0023] S203, Calculate the target value S for linear control of the upper roller position. 线控 S 线控 =S 初 +N×△S, where S 初 The real-time position value of the upper roller is collected synchronously when the straight section of the derrick passes over the upper roller of the straightening machine;

[0024] S204, By comparing the real-time position value S of the upper roller 实时 S 线控 Based on the comparison results with the model baseline value, the corresponding control strategy is selected to control the hydraulic cylinder's actions.

[0025] The real-time position value S of the upper roller 实时 =S0+(K×V x ×t-L0), where S0 is the initial cross-sectional given value, K is the ingot rod slope, and V x The values ​​represent the casting speed for different cross-sections of the billet, t represents the casting time, and L0 represents the length of the straight section of the dummy bar.

[0026] The linear adjustment method for the cross-section position of the straightening machine of the present invention constructs a position monitoring model of the straightening system by real-time detection of the running position data of the upper roller of the straightening machine, compiles an intelligent linear adjustment model for the cross-section position, and coordinates with the real-time position monitoring data to accurately adjust the running speed of the hydraulic valve for the cross-section, thereby achieving stable and uniform control of the upper roller position fluctuation caused by the cross-section, ensuring the long-term safe and stable operation of the continuous casting straightening system, and achieving the goal of long service life of the continuous casting straightening system. Attached Figure Description

[0027] This manual includes the following figures, which illustrate the following:

[0028] Figure 1 This is a schematic diagram of the straightening system of a large-section continuous casting machine;

[0029] Figure 2 This is the control logic diagram of the straightening system for a continuous casting machine according to the present invention;

[0030] Figure 3 This is a schematic diagram of the installation of the position detection device;

[0031] Figure 4 This is the front view of the position detection device;

[0032] Figure 5 This is a side view of the position detection device;

[0033] Figure 6 This is a mathematical model diagram of the linear control of the cross-section position of the straightening system in a continuous casting machine.

[0034] Figure 7 This is a curve showing the characteristic of cross-sectional position variation in the straightening system of a continuous casting machine.

[0035] Figure 8 This is a curve showing the effect of linear control of cross-section position in the straightening system of a continuous casting machine.

[0036] Figure 9 This is a schematic diagram of the derrick's structure;

[0037] The following are marked in the diagram: 1. Connecting device; 2. Position detection device; 21. Sensor upper base; 22. First bolt; 23. Locking nut; 24. Position sensor; 25. Lower base; 26. Measuring reference base; 3. Upper roller; 4. Inlet rod; 41. Straight section; 42. Inclined section; 5. Hydraulic cylinder; 6. Frame upper crossbeam. Detailed Implementation

[0038] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0039] like Figure 1 As shown, the present invention provides a method for linear adjustment of the cross-sectional position of a tension leveling machine, comprising the following steps:

[0040] S1. Collect position data of the upper roller 3 of the tension leveler and establish a position monitoring model for the tension leveling system;

[0041] S2. Adjust the operation of the oil supply valve of the hydraulic cylinder 5 connected to the upper roller 3 of the tension leveler to linearly control the position of the upper roller 3 of the tension leveler;

[0042] Among them, the position data of the upper roller 3 of the tension leveler is collected by setting a position detection device, and the working pressure of the hydraulic cylinder 5 is collected by setting an oil pressure detection device.

[0043] Specifically, this invention addresses a series of problems encountered in the operation of modern large-section continuous casting straightening systems, such as hydraulic cylinder displacement damage, frame top plate twisting and deformation, lifting slide cracking and detachment, geared motor crushing and breakage, dummy bar jamming, and billet stagnation. It provides a linear adjustment method for the cross-section changing position of the straightening machine. This invention, by real-time detection and analysis of the hydraulic cylinder stroke position data, precisely adjusts the operating speed of the cross-section changing hydraulic valve, achieving stable and uniform speed control of the dummy bar cross-section fluctuations generated during cross-section changing. This ensures the long-term safe and stable operation of the straightening machine system and achieves the goal of long service life for the continuous casting machine.

[0044] like Figure 1 As shown, the straightening machine includes an upper roller 3 and a lower roller. The upper roller 3 is located above the lower roller and is movable, while the lower roller is fixed. The straightening machine clamps and pushes the ingot rod and is fixed to the integral arc-shaped base of the continuous casting machine by connecting bolts. Two hydraulic cylinders 5 and two position detection devices are also provided, located at opposite ends of the upper roller. A connecting device is installed on the upper roller of the straightening machine, and two parallel hydraulic cylinders 5 are mounted on the connecting device. An external position detection device is installed on the straightening frame.

[0045] like Figure 4 and Figure 5 As shown, the position detection device 2 includes a position sensor 24, a measuring reference base 26, an upper sensor base 21, and a lower base 25. The position sensor 24 is fixedly mounted on the lower base 25, which is fixedly mounted on the measuring reference base 26. The upper sensor base 21 is located above the lower base 25. The measuring reference base 26 is fixedly mounted on the upper roller 32. The position sensor 24 measures the position of the upper roller in real time. The position sensor 24 is electrically connected to the control system. The position sensor 24 transmits the detected upper roller position data to the control system. The control system calculates the current position of the upper roller 32 using a built-in PLC control model, and after intelligent analysis, controls the hydraulic cylinder 5 to perform corresponding actions.

[0046] Furthermore, each continuous casting machine is equipped with four dummy bars arranged in parallel. The dummy bar is typically operated in a simultaneous full-flow or partial-flow mode. Each dummy bar is operated by multiple straightening machines. Each straightening machine is equipped with two hydraulic cylinders 5 to press down or lift the upper roller 3. A position detection device is used on the outside of the mounting position of each hydraulic cylinder 5 to detect the position data of the upper roller 3 in real time.

[0047] Hydraulic cylinder 5 is connected to an oil supply line, which supplies hydraulic oil to the cylinder. The oil supply line includes a directional valve and a servo valve, both electrically connected to the control system. These valves are controlled by the control system and are arranged in series. Multiple servo valves are used, each connected to the rod-side and rodless-side chambers of hydraulic cylinder 5. The directional valves change the direction of hydraulic oil flow, while the servo valves control the flow rate and pressure. By controlling the opening degree and oil supply speed of the servo valves, as well as the operating state of the directional valves, the extension and retraction of hydraulic cylinder 5 is controlled.

[0048] Preferably, the position sensor 24 is a laser rangefinder. The laser rangefinder has a measuring range of 0.02mm-300m and an accuracy of ±1.5mm. Each upper base is equipped with the same type of position sensor 24. The laser position sensor 24 transmits detection signals to the control system. The two position sensors 24 on the left and right sides effectively monitor the position status of the upper roller 3 of the straightening machine. Each position sensor 24 is located on the straight section S of the guide bar. min and the head of the dummy bar S max All are consistent.

[0049] like Figure 4 and Figure 5As shown, the upper base 21 of the sensor is mounted on the upper crossbeam 6 of the frame by the first bolt 22. The upper crossbeam 6 of the frame is fixedly set on the straightening machine. The position sensor 24 is set outside the mounting position of the hydraulic cylinder 5. The position sensor 24 is mounted on the lower base 25 by the second bolt and the locking nut. The lower base 25 is mounted on the measuring reference base 26 by the third bolt. The upper base 21 and the lower base 25 of the sensor are welded structures.

[0050] Preferably, the lower base 25 has a second mounting hole through which the second bolt passes, and the position sensor 24 has an internal threaded hole for the second bolt to be inserted. The second mounting hole on the lower base 25 is vertically positioned and is oblong in shape. The length of the second mounting hole is greater than the diameter of the second bolt, which facilitates adjustment of the height of the position sensor 24. Furthermore, multiple second bolts are provided, and all second bolts are arranged alternately and evenly to ensure that the position sensor 24 is subjected to uniform force.

[0051] Preferably, the lower base 25 is provided with a third mounting hole through which the third bolt passes, and the measuring reference base 26 is provided with an internal threaded hole for the third bolt to be inserted. The third mounting hole is horizontally set on the lower base 25 and is an oblong hole. The length of the third mounting hole is greater than the diameter of the third bolt, which facilitates the adjustment of the horizontal position of the lower base 25 and the position sensor 24.

[0052] The upper roller 3 has bearing assemblies on both sides. The upper roller 3 is placed inside the frame of the tension leveler for pressing and lifting actions. The bearing assemblies on both sides axially position the upper roller 3 through two sliding grooves fixed on the frame. The upper roller 3 is connected to two upper hydraulic cylinders 5 through a connecting device 1, which is a joint-type bearing structure. The upper part of the connecting device 1 is rigidly connected to the hydraulic cylinders 5, and the lower part of the connecting device 1 is rigidly connected to the upper roller 3.

[0053] Preferably, the upper roller 3 with bearing assembly adopts a self-aligning bearing structure. The middle part of the upper roller 3 has a through-type water passage structure.

[0054] The tension leveling machine includes a transmission device, and the upper roller 3 is driven by the transmission device, which includes a geared motor, a heat insulation plate, and a protective cover.

[0055] A continuous casting machine is equipped with a multi-flow straightening system, which is arranged in parallel. Each flow straightening system is equipped with multiple straightening devices for position detection. Each straightening device is equipped with two hydraulic cylinders 5, and position detection devices are installed on the outer side of the mounting positions of all hydraulic cylinders 5. The frame is equipped with a through-type guide groove assembly, which has a wear-resistant structure. The frame body has a water-cooled protective structure.

[0056] Hydraulic cylinder 5 has a dual independent structure on the left and right sides, and the displacement is synchronized and rigidity is maintained through a balance beam. Preferably, the oil pressure detection device includes an oil pressure transmitter, which is a strain gauge pressure sensor connected through an opening in the oil inlet pipe of hydraulic cylinder 5. The oil pressure detection device is connected to the control system.

[0057] like Figure 9 As shown, the traction rod includes a straight section 41 and an inclined section 42 connected to each other. The straight section 41 is a straight cylindrical structure, and its outer diameter remains constant along its length. The inclined section 42 is a portion with an inclined outer surface, and the inclined outer surface of the inclined section 42 forms an obtuse angle with the length direction of the straight section 41. The straight section 41 is the traction section of the traction rod, and the inclined section 42 is the transition section of the traction rod.

[0058] In step S1 above, the position sensor collects the upper roller position data each time the tensioning machine changes the cross-section of the tensioning bar, and the real-time position value S of the upper roller is recorded. 实时 The data is transmitted to the control system, according to formula S. 实时 =S0+(K×V x (×t-L0), establish a position monitoring model for the tensioning and straightening system, where S0 is the initial cross-sectional given value, K is the inclination of the traction rod, and V x The values ​​represent the casting speeds for different cross-sections, t represents the casting time, and L0 represents the length of the straight section 41 of the dummy bar.

[0059] When changing the cross-section of the tension bar, the control system reads the position detection data of the upper roller of each tension leveler and sequentially controls the action process of the oil inlet servo valve of the tension leveler cylinder each time the cross-section is changed, so as to realize the linear position control of the 4-flow cross-section changing tension leveler.

[0060] Furthermore, in step S1 above, before performing linear position control of the straightening system, the position monitoring model of the straightening system needs to be calibrated. Based on the calculation that the maximum cross-section of the derrick is at the head of the derrick, the initial value S displayed by the position detection device is adjusted. max When the spindle is in the straight section, the position detection device displays S. min Simulation data of the actual position of the continuous casting stable billet pulling process S 标max =S max S 标min =S min When changing the cross-section, use S 标max and S 标min As the model baseline, recalibrate the readings of the displacement position sensor instrument. When changing sections, use S... 标max The maximum opening value of the calibrated tension leveler is expressed in S. 标min The straight section of the dummy bar is calibrated. The straight section of the dummy bar is the opening value of the tension leveler when the straight section of the dummy bar enters between the upper and lower rollers.

[0061] Step S2 above includes:

[0062] S201. Set the data acquisition cycle for the upper roller position of the tension leveler to N seconds, where N is a positive integer, N=1, 2, 3...;

[0063] S202, Calculate the linear control position of the upper roller ΔS = (S 头 -S 直 ) / T, where T is the travel time of the upper roller in the inclined section of the derrick, and S 直 S represents the position of the upper roller when it is in the straight section of the derrick. 头 The value of the position of the derrick head is the value of the derrick head. The inclined section of the derrick is located between the straight section of the derrick and the head of the derrick, that is, △S is the value of the change in position of the upper roller.

[0064] S203, Calculate the target value S for linear control of the upper roller position. 线控 S 线控 =S 初 +N×△S, where S 初 The real-time position value of the upper roller is collected synchronously when the straight section of the derrick passes over the upper roller of the straightening machine;

[0065] S204, By comparing the real-time position value S of the upper roller 实时 S 线控 Based on the comparison results with the model baseline value, the corresponding control strategy is selected to control the actions of the hydraulic cylinder 5.

[0066] Two hydraulic cylinders 5 connected to the upper roller 3 are arranged in a left-right configuration. The two hydraulic cylinders 5 are respectively connected to the left and right ends of the upper roller 3. The rodless chamber of the hydraulic cylinder 5 is connected to a servo valve. The servo valve connected to the rodless chamber of the hydraulic cylinder 5 is designated as the first servo valve, and the servo valve connected to the rod chamber of the hydraulic cylinder 5 is designated as the second servo valve.

[0067] In step S204 above, the control strategy is as follows:

[0068] When S max ≥S 实时 >S 线控 0.3P 工作 <P 实时 ≤0.5P 工作 When the first servo valve is set to 100% opening and continuously operates, the first servo valve is in its maximum opening state, hydraulic oil enters the rodless chamber of the hydraulic cylinder, the hydraulic cylinder extends, the hydraulic cylinder press-down action is enabled, pushing the upper roller to move downward; P 工作 P is the maximum working pressure of the hydraulic cylinder. 实时 This is the real-time pressure value when the hydraulic cylinder presses down;

[0069] When S max ≥S 实时 >S线控 0.5P 工作 <P 实时 ≤0.7P 工作 At this time, the opening of the first servo valve is reduced to 70%, hydraulic oil enters the rodless chamber of the hydraulic cylinder, the hydraulic cylinder extends, the hydraulic cylinder press-down action is enabled, and the upper roller moves downward.

[0070] When S max ≥S 实时 >S 线控 0.7P 工作 <P 实时 ≤0.9P 工作 When the opening of the first servo valve drops to 50%, hydraulic oil enters the rodless chamber of the hydraulic cylinder, the hydraulic cylinder extends, the hydraulic cylinder press-down action is enabled, and the upper roller moves downward.

[0071] When S max ≥S 实时 >S 线控 0.9P 工作 <P 实时 ≤1.0P 工作 When the opening of the first servo valve drops to 10%, hydraulic oil enters the rodless chamber of the hydraulic cylinder, the hydraulic cylinder extends, the hydraulic cylinder press-down action is enabled, and the upper roller moves downward.

[0072] When S min ≤S 实时 ≤S 线控 At this time, the opening degree of the second servo valve is set to 50%, hydraulic oil enters the rod chamber of the hydraulic cylinder, the hydraulic cylinder contracts, the hydraulic cylinder lifting action is enabled, and the upper roller is pulled upward.

[0073] The real-time position of the upper roller of the tension leveler reaches S 实时 =S max =S 头 Once the stable billet-drawing stage is reached, the process of drawing billets using the above control method will continue until the cross-section is changed.

[0074] In the above process, the opening of the servo valve is gradually reduced according to the position value of the upper roller and the pressure value of the hydraulic cylinder, and the step setting simplifies the control program.

[0075] The above-described continuous casting machine straightening system has the following advantages:

[0076] (1) The linear adjustment method for the cross-section position of the straightening machine of the present invention constructs a position monitoring model of the straightening system by real-time detection of the running position data of the upper roller of the straightening machine, compiles an intelligent linear adjustment model for the cross-section position, coordinates the real-time position monitoring data, and precisely adjusts the running speed of the hydraulic valve of the cross-section, so as to achieve stable and uniform control of the upper roller position fluctuation caused by the cross-section, ensure the long-term safe and stable operation of the continuous casting straightening system, and achieve the long service life target of the continuous casting straightening system;

[0077] (2) The present invention provides a linear adjustment method for the cross-sectional position of a tension leveler, wherein the position sensing device is set outside the hydraulic cylinder mounting position on the top of the tension leveler, the upper base is fixed to the cross beam of the tension leveler frame by bolts, and the sensor and the base are connected by connecting screws; the position of both sides of the upper roller of the tension leveler is detected by emitting laser, without any extra auxiliary equipment, and unlike the conventional method of indirectly feeding back the position of the upper roller of the tension leveler by detecting the stroke of the hydraulic cylinder inside the hydraulic cylinder, the method is low in cost, simple in structure, easy to maintain and repair, and the position detection is accurate and precise, directly feeding back the position of the upper roller of the hydraulic cylinder, and the data is reliable, effective and intuitive.

[0078] Example 1

[0079] Combination Figure 1 The straightening system for large-section continuous casting machines includes a four-strand parallel straightening system, with each strand having four pinch roll devices and nine straightening machines. To ensure furnace and machine production matching, four-strand full-strand casting or few-strand casting is usually adopted. Each straightening machine uses a dummy bar, which consists of a large end, an inclined section, and a straight section.

[0080] The leveling machine in continuous casting production maintains a 100% operating rate for each casting cycle, typically performing section-changing operations according to plan. The section-changing process is as follows: replace the crystallizer → replace the spray ring → replace the dummy bar → replace the electric stirrer or adjust its position → feed the dummy bar → plug the dummy bar → start casting → pull the dummy bar → cast billet → continuous casting (optional) → tapping. Each time the section is changed, the dummy bar is replaced with the corresponding specification. Due to the large cross-sectional span, the dummy bar changes from 12.1t for 600mm to 21.8t for 1200mm, resulting in significant variations in pressing force. The position of the upper roller on the leveling machine also changes by 600mm. Due to improper control, it is very easy for the dummy bar and the opening of the leveling machine to become mismatched, causing serious damage to the leveling machine.

[0081] Based on the structure of the straightening machine and the characteristics of the continuous casting process, this embodiment sets up a position monitoring model system between the upper beam of the frame and the upper roller of each straightening machine. The system uses position change curves to establish the correspondence between the actions of the directional valve and servo valve of the hydraulic cylinder, thus defining a linear control target for the cross-section position fluctuation. A mathematical linear control model program is developed; the hydraulic servo control system is precisely controlled to achieve linearization of the cross-section position control.

[0082] For the two position detection devices set at the left and right ends of the upper roller 3, the position sensor 24 used to detect the position of the left end of the upper roller 3 is set as the left position sensor, and the position sensor 24 used to detect the position of the right end of the upper roller 3 is set as the right position sensor. The two hydraulic cylinders are located between the left position sensor and the right position sensor.

[0083] Combination Figure 3 In this embodiment, two symmetrical upper and lower bases are designed and installed on the upper roller and the upper crossbeam of the frame of each tension leveling machine. A laser position detection device is installed on the upper base. Each position detection device collects position data every 1 second according to process requirements. The real-time position data of the upper roller of the tension leveling machine is S. 均 =(S 左 +S 右 ) / 2, S 左 S represents the value from the left position sensor. 右 The value is from the position sensor on the right. The position detection device of the four-flow tension leveler constitutes the detection model of the tension leveler system.

[0084] In this embodiment, a laser ranging position sensor is installed between the frame beam and the upper roller of the leveling machine, with a base and bolt assembly structure. This sensor monitors the positional changes between the upper roller and the beam in real time, and combines this with calculations to establish an equipment position monitoring model. This allows for accurate understanding of the corresponding equipment operating status, prediction of positional change trends based on the process characteristics of the equipment, precise adjustment of equipment operating parameters, effective control of positional changes, reduction of upper roller position deviation, ensuring safe and stable equipment operation, reducing equipment risks, extending equipment service life, and truly achieving inherent safety for high-quality development. This also provides real-time and accurate dynamic position data for intelligent control.

[0085] This embodiment designs a linear position control model for the straightening system, which operates during the feeding and pulling of the dummy bar. Specifically, the hydraulic cylinder directional valves and servo valves of at least the first-flow straightening system participate in the adjustment simultaneously. This control model reads the position detection data of the upper roller of the straightening machine as the dummy bar passes through and sequentially controls the opening and closing of each valve. During normal dummy bar feeding, the position adjustment of the straightening system is basically stable. The control model controls the fluctuation of the upper roller position of the straightening machine each time the cross-section is changed, thus effectively achieving linear position control of the four-flow straightening machine. The coordinated linear position control of the four-flow straightening machine at cross-section changes achieves linear position control of the straightening machine system.

[0086] This embodiment of a method for linear adjustment of the cross-sectional position in a continuous casting straightening system specifically includes the following steps:

[0087] First, the position detection model of the upper roller of the tension leveler is calibrated. Based on the calculation that the maximum cross-section of the derrick is at the head of the derrick, the initial display value S of the position detection device is adjusted. max When the spindle is in the straight section, the position detection device displays S.min Simulation data of the actual position of the continuous casting stable billet pulling process S 标max =S max S 标min =S min When changing the cross-section, use S 标max S 标min The model baseline values ​​were used to recalibrate the display values ​​of the displacement position sensor instrument.

[0088] Then, the position of the tension leveling machine system is linearly controlled, specifically including:

[0089] 1. After the position monitoring data is calibrated, the position of the upper roller of each tension leveler is collected;

[0090] 2. Record the position value S of the upper roller of the tension leveler when it is in the straight section of the guide bar. 直 Position S of the spindle head 头 ;

[0091] 3. Set the location acquisition cycle N to 1 second.

[0092] 4. Linear control position ΔS = (S 头 -S 直 ) / T, where T is the running time of the upper roller of the tension leveler in the inclined section;

[0093] 5. Set S 线控 =S 初 +N×△S,S 初 The real-time position value is read synchronously when the straight section of the derrick passes over the upper roller of the straightening machine;

[0094] 6. When S max ≥S 实时 >S 线控 0.3P 工作 <P 实时 ≤0.5P 工作 At that time, the upper chamber servo valve continuously operates at a given 100% opening degree; P 工作 Maximum working pressure of the hydraulic cylinder, P 实时 This is the real-time pressure value when the hydraulic cylinder presses down;

[0095] 7. When S max ≥S 实时 >S 线控 0.5P 工作 <P 实时 ≤0.7P 工作 At that time, the setpoint of the upper chamber servo valve drops to 70%;

[0096] 8. When S max ≥S 实时 >S 线控 0.7P 工作 <P 实时≤0.9P 工作 At that time, the setpoint of the upper chamber servo valve drops to 50%;

[0097] 9. When S max ≥S 实时 >S 线控 0.9P 工作 <P 实时 ≤1.0P 工作 At that time, the setpoint of the upper chamber servo valve drops to 10%;

[0098] 10. When S min ≤S 实时 ≤S 线控 The lower chamber servo valve is set to 50%;

[0099] 11. The hydraulic cylinder reversing valve and servo valve of the tension leveling machine are controlled in a cycle as described above to achieve linear position control.

[0100] 12. The real-time position of the upper roller of the tension leveler reaches S. 实时 =S max =S 头 Once the stable billet-drawing stage is reached, repeat the above control process until the next set of dummy bar billet-drawing begins, until the cross-section is changed (see details). Figure 2 The mathematical model for linear control of cross-sectional position in a continuous casting straightening system is as follows: Figure 6 As shown.

[0101] In practical applications, during billet pulling operations, the deviation of the hydraulic cylinders in the upper roller of the continuous casting straightening machine suddenly increased from 0-1mm to 201mm. This caused damage to the hydraulic cylinder displacement, distortion and deformation of the frame top plate, cracking and detachment of the lifting slide, and crushing of the reduction motor. The intelligent position lifting linear control scheme of the upper roller position in this embodiment reduces the deviation during the ingot pulling process, stabilizing the hydraulic cylinder deviation to 3-5mm. The hydraulic cylinder no longer skews, and the upper roller position matches the ingot rod position, significantly extending the service life of the straightening machine and ensuring stable operation of the production equipment. Further application of the above control model allows for intelligent control of the hydraulic servo system, achieving the goal of linear control of the straightening machine position during the section-changing process. The improved position control accuracy of the 600mm to 700mm section transition in the large round billet continuous casting straightening system, according to the model application requirements, achieves the goal of linear and uniform lifting of the upper roller position during the section-changing process.

[0102] In addition, this linear adjustment scheme is applied to the scenario of changing from 800mm to 900mm cross-section in a large round billet continuous casting machine: when the straight section of the dummy bar enters the straightening machine, S 右 >S 左 During intelligent control operation, the hydraulic cylinder controls the directional valve to achieve balanced adjustment. However, due to equipment jamming T... max >5s, T maxThe maximum execution time of the instruction is set as the protection action. After on-site confirmation and troubleshooting, the fault is eliminated to prevent overshoot from damaging the straightening machine.

[0103] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A method for linearly adjusting the cross-sectional position of a tension leveling machine, characterized in that, Including the following steps: S1. Collect the position data of the upper roller of the tension leveler and establish a position monitoring model of the tension leveling system; S2. Adjust the operation of the oil supply valve of the hydraulic cylinder connected to the upper roller of the tension leveler to linearly control the position of the upper roller of the tension leveler; Among them, the position data of the upper roller of the tension leveler is collected by setting a position detection device, and the working pressure of the hydraulic cylinder is collected by setting an oil pressure detection device; Before performing linear position control of the straightening system, the position monitoring model of the straightening system needs to be calibrated. Based on the calculation that the maximum cross-section of the derrick is at the head of the derrick, the initial value S displayed by the position detection device is adjusted. max When the spindle is in the straight section, the position detection device displays S. min Simulation data of the actual position of the continuous casting stable billet pulling process S 标max =S max S 标min =S min When changing the cross-section, use S 标max and S 标min As the model reference value, recalibrate the instrument display value of the position detection device, and use S when changing the cross section. 标max The maximum opening value of the calibrated tension leveler is expressed in S. 标min Calibrate the straight section pressing value of the dummy bar. The straight section pressing value of the dummy bar is the opening value of the tension leveler when the straight section of the dummy bar enters between the upper and lower rollers. Step S2 includes: S201. Set the data acquisition cycle for the upper roller position of the tension leveler to N seconds; S202, Calculate the linear control position of the upper roller ΔS = (S 头 -S 直 ) / T, where T is the travel time of the upper roller in the inclined section of the derrick, and S 直 S represents the position of the upper roller when it is in the straight section of the derrick. 头 This refers to the position value of the spindle head; S203, Calculate the target value S for linear control of the upper roller position. 线控 S 线控 =S 初 +N×△S, where S 初 The real-time position value of the upper roller is collected synchronously when the straight section of the derrick passes over the upper roller of the straightening machine; S204, By comparing the real-time position value S of the upper roller 实时 S 线控 Based on the model baseline value, the comparison results and the real-time pressure value when the hydraulic cylinder is pressed down are used to select the appropriate control strategy to control the hydraulic cylinder's actions. In step S204, the control strategy is as follows: When S max ≥S 实时 >S 线控 0.3P 工作 <P 实时 ≤0.5P 工作 When the first servo valve is set to 100% opening and continuously operates, the first servo valve is in its maximum opening state, hydraulic oil enters the rodless chamber of the hydraulic cylinder, the hydraulic cylinder extends, the hydraulic cylinder press-down action is enabled, pushing the upper roller to move downward; P 工作 P is the maximum working pressure of the hydraulic cylinder. 实时 This is the real-time pressure value when the hydraulic cylinder presses down; When S max ≥S 实时 >S 线控 0.5P 工作 <P 实时 ≤0.7P 工作 At this time, the opening of the first servo valve is reduced to 70%, hydraulic oil enters the rodless chamber of the hydraulic cylinder, the hydraulic cylinder extends, the hydraulic cylinder press-down action is enabled, and the upper roller moves downward. When S max ≥S 实时 >S 线控 0.7P 工作 <P 实时 ≤0.9P 工作 When the opening of the first servo valve drops to 50%, hydraulic oil enters the rodless chamber of the hydraulic cylinder, the hydraulic cylinder extends, the hydraulic cylinder press-down action is enabled, and the upper roller moves downward. When S max ≥S 实时 >S 线控 0.9P 工作 <P 实时 ≤1.0P 工作 When the opening of the first servo valve drops to 10%, hydraulic oil enters the rodless chamber of the hydraulic cylinder, the hydraulic cylinder extends, the hydraulic cylinder press-down action is enabled, and the upper roller moves downward. When S min ≤S 实时 ≤S 线控 At this time, the opening degree of the second servo valve is set to 50%, hydraulic oil enters the rod chamber of the hydraulic cylinder, the hydraulic cylinder contracts, the hydraulic cylinder lifting action is enabled, and the upper roller is pulled upward. The real-time position of the upper roller of the tension leveler reaches S 实时 =S max =S 头 Once the stable billet-drawing stage is reached, the process of drawing billets using the above control method will continue until the cross-section is changed.

2. The linear adjustment method for the cross-sectional position of the tension leveler according to claim 1, characterized in that, The position detection device includes a position sensor, which is electrically connected to the control system.

3. The linear adjustment method for the cross-sectional position of the tension leveler according to claim 2, characterized in that, The position detection device further includes a measuring reference base, an upper sensor base, and a lower base. The position sensor is disposed on the lower base, the lower base is disposed on the measuring reference base, the upper sensor base is located above the lower base, and the measuring reference base is disposed on the upper roller.

4. The linear adjustment method for the cross-sectional position of the tension leveler according to claim 3, characterized in that, The upper base of the sensor is mounted on the crossbeam of the frame by a first bolt, the position sensor is mounted on the lower base by a second bolt, and the lower base is mounted on the measuring reference base by a third bolt.

5. The linear adjustment method for the cross-sectional position of the tension leveler according to claim 4, characterized in that, The lower base is provided with a second mounting hole for the second bolt to pass through, and the second mounting hole is a waist-shaped hole.

6. The linear adjustment method for the cross-sectional position of the tension leveler according to claim 5, characterized in that, The lower base is provided with a third mounting hole for the third bolt to pass through, and the third mounting hole is a waist-shaped hole.

7. The linear adjustment method for the cross-sectional position of a tension leveling machine according to any one of claims 2 to 6, characterized in that, The position sensor is a laser rangefinder.

8. The linear adjustment method for the cross-sectional position of a tension leveling machine according to any one of claims 2 to 6, characterized in that, Two hydraulic cylinders and two position detection devices are provided. The two position detection devices are located at both ends of the upper roller, and the two hydraulic cylinders are located between the two position detection devices.

9. The linear adjustment method for the cross-sectional position of a tension leveler according to claim 1, characterized in that, The real-time position value S of the upper roller 实时 =S0+(K×V x ×t-L0), where S0 is the initial straight section position of the dummy bar, K is the slope of the dummy bar, and V x For different cross-section billet casting speeds, t is the casting time, and L0 is the length of the straight section of the dummy bar.

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