Device and method for on-line detection of billet shape and accurate cutting

Abstract

The application discloses a kind of online detection steel billet shape and accurate cutting device and method, belong to steel billet production process technical field.The present application includes steel billet cutting machine, computer control system, laser range finder and steel billet weighing equipment, laser range finder is equipped with two, respectively is set in the two sides of steel billet to be cut, and two laser range finders are all installed in cooling protection equipment, for the shape of real-time online detection steel billet to be cut;The steel billet weighing equipment is used to weigh after cutting steel billet;Steel billet cutting machine, laser range finder and steel billet weighing equipment are all connected with computer control system.The technical scheme of the present application can be online real-time to judge whether steel billet is deformed, then timely cut off the steel billet that appears problem, greatly improve the quality of steel billet, simultaneously can also be online continuously corrected the real density of steel billet, realize accurate cutting steel billet's function, greatly improve the economic efficiency of enterprise.

Description

Technical Field

[0001] This invention belongs to the field of steel billet production technology, and more specifically, relates to an apparatus and method for online detection of steel billet shape and precise cutting. Background Technology

[0002] In the production of various steel products in steel plants, there are two methods for solidifying molten steel into shape: the traditional ingot casting method and the continuous casting method. Continuous casting technology, which emerged in Europe and America in the 1950s, is an advanced technology that directly pours molten steel into shape. Compared with traditional methods, continuous casting technology has significant advantages such as greatly improving metal yield and billet quality, and saving energy. However, after continuous casting, the shape of the billet often changes. The main reason is that the billet cools unevenly in the crystallizer, resulting in an uneven shell thickness and uneven shrinkage. This series of unevennesses leads to changes in the billet's shape. If the secondary cooling zone remains uneven after exiting the crystallizer, and the shell support is insufficient, the billet deformation will intensify. Even if the secondary cooling zone cools evenly, the uneven shell thickness causes inconsistent temperatures, resulting in uneven shell shrinkage and continued billet deformation. Therefore, the use of substandard crystallizers is the main cause of billet deformation. However, the cooling effect of the secondary cooling zone should not be ignored. Thus, after continuous casting, steel companies typically use visual inspection to check for changes in the billet's shape. If the billet's shape changes, the substandard parts need to be cut to prevent crack propagation and potential steel leakage. Furthermore, severe billet deformation can cause difficulties in stacking steel in the heating furnace, making it difficult to bite into the rolling mill pass. During rolling, this can lead to tipping and folding defects, significantly impacting the billet's yield and the overall steel production rate.

[0003] Furthermore, steel billets are typically cut to a fixed weight before rolling. However, since the accurate weight of the billet cannot be directly measured before cutting, most steel companies currently use length-based cutting, converting the measurement of billet weight into the measurement of billet length. Due to the lack of unified technical standards in the research and modification of fixed-weight cutting, the forms, processes, and effects of modification vary among companies. The most important aspect of fixed-weight cutting is maintaining consistent quality. In continuous casting cutting, a PLC system transfers billets of multiples of the rebar length to the continuous casting process and sets them as the target unit weight. The continuous casting process calculates the length based on the billet weight and uses this calculated length as the set billet length for cutting. The weight of the cut billet is then weighed, and the difference is compared with the set weight to obtain the deviation. This allows for compensation of the set length for the next billet to be cut, avoiding the impact of uniformly cutting to length. While maintaining a stable rolling yield, this effectively reduces metal loss. However, in actual production processes… The shape of the internal cavity of a steel billet is constantly changing due to factors such as steel grade, temperature, casting speed, and wear of the crystallizer, resulting in a real-time change in the billet's cross-sectional area. Furthermore, the crystalline structure of the billet also affects its density; for example, the densities of fine equiaxed grain regions, coarse equiaxed grain regions, and columnar grain regions differ, causing the actual density of the billet to vary. Therefore, existing cutting methods have significant limitations.

[0004] A search revealed publicly available information regarding methods for inspecting and cutting the shape of steel billets, such as:

[0005] Chinese patent application publication number CN112288746A, publication date: January 29, 2021, patent title: A method and system for detecting desquamation based on machine vision. This patent involves installing a 3D vision device at the end of the furnace feed roller conveyor. The device captures images of the steel billet's end face on the conveyor, obtaining an image of the billet's end face. 3D point cloud data is then determined from the billet's end face image. Based on multiple edges selected from the 3D point cloud data, the billet's pose is determined. If the billet is in a normal pose, the included angle between two intersecting edges is determined based on the 3D point cloud data of the points in the point clouds of any two intersecting edges. If all included angles conform to a first preset angle range, the billet is determined to be a qualified billet.

[0006] The Chinese patent authorization announcement number is CN212779001U, the announcement date is March 23, 2021, and the patent title is: A special online measuring tool for square billet removal. This patent includes: a handle and a right-angle measuring tool. The right-angle measuring tool includes: a vertical section and a horizontal section; the vertical section includes: a measuring contact surface of the vertical section and at least one non-measuring contact surface of the vertical section; the horizontal section includes: a measuring contact surface of the horizontal section and at least one non-measuring contact surface of the horizontal section; the non-measuring contact surface of the at least one horizontal section includes a scale groove or scale line; the thickness of the vertical section and the horizontal section is greater than or equal to 15 mm; one end of the vertical section is connected to one end of the horizontal section, and the measuring contact surface of the vertical section is perpendicular to the measuring contact surface of the horizontal section; one end of the handle is connected to the right-angle measuring tool.

[0007] Chinese patent application publication number CN102101163A, published on June 22, 2011, is entitled: "Laser Vision Weighting Cutting Method and Device for Cross-Sectional Integral Continuous Casting Billets." This patent utilizes a laser, a camera, and a computer equipped with image processing and weighting software. Through synchronization technology between the vision imaging system and the cutting system, it realizes the integration of the cross-sectional contour area of ​​the continuous casting billet along the direction of the billet's conveying speed, thereby achieving weight calculation for continuous casting billet cutting.

[0008] Chinese patent application publication number CN103008775A, published on April 3, 2013, entitled "A Method for Controlling Fixed-Length Cutting of Multi-Flow Steel Billets." This patent enables fixed-length cutting of multi-flow steel billets by setting up an image information detection and control hardware system, system initialization, and an automatic process control program. The image information detection and control system includes an image sensor, a signal processor, a controller, and a shearing machine. System initialization consists of three steps: image calibration to design an image grid and establishing an image background database. The automatic process control program consists of six steps: setting the cutting length of the steel billet, setting the image acquisition interval, acquiring images and correcting image distortion, performing perspective transformation on the images, identifying and tracking the steel billet head, and the shearing machine cutting the steel billet. Once a steel billet head is identified at a certain position in the image "data area," it can be confirmed that all "data areas" to its right are background images. The overall calculation time can be reduced, and the cutting accuracy can be controlled within ±5mm.

[0009] Of the four disclosed patents, the first two can detect the shape of steel billets by using machine vision and manual measurement to roughly determine their shape, but they do not calculate the actual internal shape of the billet, thus failing to meet the requirement of subsequent weight-based cutting. Furthermore, the first patent cannot actually perform online detection of steel billets, especially those that have just completed continuous casting and are still at high temperatures. While the second patent uses a manual measurement method, which can measure the billet shape online, it is time-consuming, labor-intensive, and costly. Most importantly, its technical solution cannot accurately calculate the quantitative value of the steel billet.

[0010] The third and fourth patents focus on solving the problem of billet cutting. The third patent aims to achieve fixed-weight cutting of billets, but it only considers the change in cross-sectional area during continuous casting, neglecting the influence of the billet's crystal structure on density. The densities of fine equiaxed, coarse equiaxed, and columnar crystal regions differ, meaning the actual density of the billet changes in real time. The fourth patent focuses on improving cutting accuracy after billet is cut to length using a series of devices, but it ignores the changes in cross-sectional area and density, inevitably leading to discrepancies between the cutting result and the actual weight. Therefore, there is currently no satisfactory method for online detection of billet shape under high-temperature conditions and for calculating the cutting position of the billet while considering the simultaneous changes in cross-sectional area and density. Summary of the Invention

[0011] 1. The problem to be solved

[0012] The purpose of this invention is to solve the problem of how to detect the shape of steel billets online under high-temperature conditions and accurately calculate the cutting position of the steel billets when considering the simultaneous changes in the cross-sectional area and density. A device and method for online detection and precise cutting of steel billets are designed. The technical solution of this invention can not only calculate all information about the internal cavities of the steel billet, helping to determine in real-time whether the steel billet has deformed, but also promptly remove problematic steel billets, significantly improving the quality of the steel billets and avoiding various problems in subsequent steel billet rolling processes. Simultaneously, this invention can also continuously correct the actual density of the steel billet online, achieving precise cutting of the steel billet and greatly improving the economic efficiency of enterprises.

[0013] 2. Technical Solution

[0014] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0015] This invention provides an online device for detecting the shape of steel billets and for precise cutting, comprising a steel billet cutting machine and a computer control system, characterized in that: it further includes a laser rangefinder and a steel billet weighing device, wherein:

[0016] Two laser rangefinders are provided, located on both sides of the steel billet to be cut. The steel billet is placed on the billet conveying roller, and both laser rangefinders are installed in a cooling protection device for real-time online detection of the shape of the steel billet. By setting up the cooling protection device, not only can it play a role in heat insulation and dust prevention, but it will not affect the operation of the laser rangefinder, thus providing the possibility of online detection of the shape of the steel billet.

[0017] The billet weighing device is used to weigh the cut billets. It is connected to a computer control system and operates under the control of the computer control system. After the billet is cut, the weight of the cut billet is measured immediately, and the collected weight data of the cut billet is transmitted to the computer control system in real time for subsequent correction of the true density of the billet, so as to improve the accuracy of the next section of billet cutting.

[0018] Both the billet cutting machine and the laser rangefinder are connected to a computer control system. The computer control system first receives data from the two laser rangefinders, processes the received data, and calculates the cross-sectional shape data of the billet to help determine whether the billet has deformed, thus achieving the function of online detection of the billet's shape. Then, after the weight of the cut billet is measured, the computer control system receives data from the billet weighing equipment, automatically processes and calculates the received data, and can correct the actual density of the cut billet in real time online, thereby accurately calculating the real-time cutting position of the next section of the billet. Ultimately, it realizes the function of online detection of the billet's shape and precise cutting, as well as the degree of automation.

[0019] As a further improvement of the present invention, the cooling protection device includes a quartz protective cover, which is a box-like structure and is placed over the surface of the laser rangefinder to protect it. More optimally, the entire outer shell of the quartz protective cover is machined into a double layer, with circulating cooling water filling the double-layer shell. This effectively prevents the laser rangefinder from operating at high temperatures. Furthermore, heat-insulating glass is machined on the shell of the quartz protective cover at the laser emission point of the laser rangefinder. The heat-insulating glass is tightly connected to the quartz protective cover, providing heat insulation and dust protection without affecting the normal operation of the laser rangefinder.

[0020] As a further improvement of the present invention, the heat-insulating glass is designed with a double-layer structure and is made of AR glass. By optimizing the material selection of the heat-insulating glass, the requirements of heat resistance, high light transmittance, and anti-reflection are taken into account, thereby creating the most suitable environmental conditions for the normal operation of the laser rangefinder. This significantly improves the accuracy of data acquisition, reduces errors, and ultimately effectively improves the accuracy of online detection of billet shape and the accuracy of subsequent billet volume calculation.

[0021] As a further improvement of the present invention, it also includes a base and an arc-shaped guide rail. The quartz protective cover is fixedly connected to the base, and the base can be slidably installed on the arc-shaped guide rail. Through the setting of the base, the entire quartz protective cover together with the laser rangefinder can move back and forth on the arc-shaped guide rail.

[0022] As a further improvement of the present invention, the base is made of stainless steel, and the outer shell of the base is also processed into a double layer, communicating with the quartz protective cover shell. The base shell is filled with circulating cooling water. The flow of cooling water between the double-layered shell of the quartz protective cover and the base ensures that the ambient operating temperature of the laser rangefinder will not exceed 100℃, thus effectively preventing damage to the laser rangefinder caused by operation in high-temperature environments. At the same time, the stainless steel construction of the base effectively improves its service life.

[0023] As a further improvement of the present invention, the base is provided with a traction block, which is connected to a computer control system and is used to pull the base to slide on the arc-shaped guide rail to adjust the measuring angle of the laser rangefinder. The measuring angle adjustment range of each laser rangefinder is 0° to 90°. Figure 2 As shown, the current base is located at point G, which can... Figure 2 The laser rangefinder moves back and forth between points A and B. During this movement, the position of the laser rangefinder remains at point O, achieving positional invariance. At this time, the measurement range of the laser rangefinder is... Figure 2 The area traversed by the rotation from the OC segment to the OD segment (or from the OD segment to the OC segment), combined with the arc-shaped guide rail and laser rangefinder on the other side, can completely collect relevant information about the steel billet to be cut.

[0024] The present invention provides a method for online detection and precise cutting of steel billet shape, which uses the above-mentioned device to collect steel billet data, processes the collected data, and controls a steel billet cutting machine to perform automatic cutting through a computer control system.

[0025] As a further improvement to the present invention, the following method is included:

[0026] Step 1: The computer control system controls the two laser rangefinders to work and receives the data transmitted from the two laser rangefinders. It uses the billet shape detection model to calculate the cross-sectional shape of the billet based on the received data and detects whether the billet shape has been deformed.

[0027] Step 2: If deformation occurs and the degree of deformation exceeds the preset value, cut off and remove the deformed part until the billet is no longer deformed or the degree of deformation meets the standard before proceeding to the next step.

[0028] Step 3: Calculate the target volume of the billet to be cut based on the target weight of the billet and the density of the billet after the previous cut as the initial density. Combine the shape detection data to calculate the current volume of the billet in real time. When the volume reaches the target volume, the computer control system controls the billet cutting machine to cut.

[0029] Step 3: Weigh the cut steel billet to obtain its true weight, and transmit the weight data to the computer control system. Combined with the billet volume data, calculate the true density, record it in the system, realize density correction, and use the true density as the initial density for the next segment of steel billet cutting to guide the next steel billet cutting.

[0030] Step 4: Repeat steps 1 to 3 above until the entire billet is cut.

[0031] The cutting method described above can calculate the shape information of the internal cavity of the steel billet, determine whether the steel billet has deformed in real time online, and then promptly cut off the problematic steel billet, significantly improving the quality of the steel billet and avoiding various problems that may occur in the subsequent steel billet rolling process. Simultaneously, it can also continuously correct the actual density of the steel billet online, achieving precise cutting of the steel billet and greatly improving the economic efficiency of enterprises.

[0032] 3. Beneficial effects

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] (1) The present invention provides an online inspection and precise cutting device for steel billet shape. Through optimized design of the overall structure of the device, a quartz protective cover with a water-cooling circulation system and double-layer heat-insulating glass are used to provide all-round protection for two laser rangefinders, forming a sealed space inside. This effectively prevents dust in the working environment from entering the laser rangefinders and affecting their service life. At the same time, by selecting the best type of heat-insulating glass, the double-layer heat-insulating glass uses high-temperature resistant and anti-reflective AR glass material, which can achieve heat insulation and dust prevention without affecting the normal operation of the laser rangefinders.

[0035] (2) The present invention provides an online detection and precise cutting device for steel billet shape. The computer control system can calculate based on the data transmitted from two laser rangefinders to obtain all the information of the internal cavity of the steel billet. It can determine whether the steel billet is deformed in real time online and then cut off the problematic steel billet in time, which greatly improves the quality of the steel billet and avoids problems such as inability to roll and product defects in the subsequent steel billet rolling process.

[0036] (3) The present invention provides an online method for detecting the shape of steel billets and for precise cutting. The computer control system can calculate based on the shape information of the internal cavity of the steel billet and the data transmitted from the steel billet weighing equipment to accurately determine the real-time cutting position of the next section of the steel billet, thereby controlling the steel billet cutting machine to precisely cut the steel billet. At the same time, the density of the steel billet to be cut can be continuously corrected using the actual density of the already cut steel billet, truly realizing online continuous correction of the actual density of the steel billet, thereby achieving the purpose of precise cutting of the steel billet and greatly improving the economic efficiency of enterprises. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of a device for online detection of steel billet shape and precise cutting according to the present invention;

[0038] Figure 2 This is a schematic diagram showing the relative position of the laser rangefinder and the steel billet in this invention;

[0039] Figure 3 This is a calculation diagram of the online detection results of the billet shape in this invention;

[0040] Figure 4 This is a flowchart of the online inspection and cutting method for steel billets according to the present invention.

[0041] In the picture:

[0042] 1. Billet conveyor roller; 2. Billet to be cut; 3. Laser rangefinder; 4. Quartz protective cover; 5. Heat-insulating glass; 6. Base; 7. Curved guide rail; 8. Billet cutting machine; 9. Cut billet; 10. Billet weighing equipment; 11. Computer control system. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0044] like Figure 1-2 As shown, the present invention discloses an online device for detecting the shape of steel billets and for precise cutting, comprising a laser rangefinder 3, a steel billet weighing device 10, a steel billet cutting machine 8, and a computer control system 11. Two laser rangefinders 3 are respectively placed on both sides of the steel billet conveying roller 1, and can measure in real time relevant information of the steel billet 2 to be cut: the lengths of the six sides GB, GA, GD, FA, FD, and FC, and the degree measures of the six angles ∠BGA, ∠AGD, ∠BGD, ∠AFD, ∠DFC, and ∠AFC, such as... Figure 2 As shown, the laser rangefinder 3 can then communicate with the control computer and transmit the measured data to the computer control system 11 in real time.

[0045] To ensure that the laser rangefinder 3 can inspect the shape of the steel billet online, this invention also includes a cooling protection device. The two laser rangefinders 3 are installed within this device, providing heat insulation and dust protection. This not only does not affect the normal operation of the laser rangefinders but also extends their service life. More optimally, the cooling protection device in this invention includes a quartz protective cover 4, made of quartz sand. Quartz sand is a hard, wear-resistant, and chemically stable silicate mineral, insoluble in acid, with a melting point of 1750℃, and exhibits piezoelectricity, making it highly suitable for use in such high-temperature environments.

[0046] The quartz protective cover 4 is machined into a rectangular box structure, and the entire quartz protective cover 4 covers the surface of the laser rangefinder 3. Furthermore, the entire outer shell of the quartz protective cover 4 is machined into a double layer, and the double-layer shell is filled with circulating cooling water. By setting up the cooling circulating water, damage to the laser rangefinder 3 in high-temperature working environment can be effectively avoided, thereby realizing the function of online detection of the billet shape.

[0047] The quartz protective cover 4 has an opening on one side corresponding to the laser emission point of the laser rangefinder 3. The size of the opening can be designed according to the size of the laser rangefinder 3. The purpose is to allow the laser rangefinder 3 to measure the relevant information of the steel billet 2 to be cut without obstruction. A heat-insulating glass 5 is sealed and installed at the opening. The heat-insulating glass 5 is set perpendicular to the emission end of the laser rangefinder 3. By setting the heat-insulating glass 5 and the quartz protective cover 4, the relevant information of the steel billet 2 to be cut can be measured without obstruction. At the same time, it effectively prevents dust in the working environment from entering the interior of the laser rangefinder 3, so as not to affect the normal operation of the laser rangefinder 3 and its service life.

[0048] In another embodiment of the present invention, the heat-insulating glass 5 is configured with a double-layer structure, with a vacuum between the two layers. This effectively prevents heat from being transferred from this layer to the interior of the quartz protective cover 4. Furthermore, the heat-insulating glass 5 of the present invention is made of a high-temperature resistant, anti-reflective glass material, which can achieve heat insulation and dust prevention without affecting the normal operation of the laser rangefinder. It should be noted that regarding the choice of glass material, the applicant initially used colorless transparent acrylic organic glass, which has good light transmittance, allowing more than 92% of sunlight to pass through, and has certain heat resistance, cold resistance, and corrosion resistance. However, during actual laboratory testing, it was found that the acrylic organic glass began to undergo thermal deformation when the operating temperature exceeded 80℃, causing the entire laser rangefinder 3 to malfunction. Subsequently, ultra-clear glass was selected for experiments. This is a high-transmittance, low-iron glass with a light transmittance of over 91%, and it also has high-temperature and low-temperature resistance characteristics. The highest temperature can reach 1200℃, and the lowest is -60℃. After using ultra-clear glass, thermal deformation was eliminated in high-temperature environments. However, due to its inherent reflectivity, it still affected the operation of the laser rangefinder 3. Subsequently, the applicant selected AG glass with anti-reflective properties. AG glass, also known as anti-reflective glass, works by "roughening" the glass surface, transforming the reflective surface (a smooth mirror) into a non-reflective matte surface (an uneven, rough surface), resulting in a lower reflectivity compared to ordinary glass, reducing light reflectivity from 8% to below 1%. However, actual laboratory tests revealed that while AG glass reduced light reflectivity, it did not increase light transmittance, still affecting the laser rangefinder to some extent. Finally, after multiple trials, AR glass (purchased from Shenzhen Chenglong Glass Co., Ltd.) was selected. AR glass, also known as anti-reflective glass, is produced using the most advanced international magnetron sputtering coating technology to coat ordinary tempered glass with an anti-reflective film, effectively reducing the glass's own reflection and increasing its light transmittance, resulting in more realistic colors. AR glass boasts a visible light transmittance of up to 99% and a reflectivity of less than 0.5%. It can withstand temperatures exceeding 500 degrees Celsius, and its surface smoothness far surpasses that of other glasses. Furthermore, its coating layer remains undamaged even after being wiped with acidic and alkaline cleaning agents. Actual laboratory testing has demonstrated its ability to withstand demanding working environments, minimizing its impact on the laser rangefinder 3.

[0049] like Figure 1-2As shown, in another embodiment of the present invention, the device further includes a base 6 and an arc-shaped guide rail 7. The base 6 is fixedly connected to the quartz protective cover 4. The base 6 is made entirely of stainless steel, and its outer shell is also double-layered and connected to the shell of the quartz protective cover 4. The shell of the base 6 is filled with circulating cooling water. Through the circulation of water inside the quartz protective cover 4 and the base 6, the ambient operating temperature of the laser rangefinder 3 can be ensured not to exceed 100°C, effectively avoiding damage to the laser rangefinder 3 caused by working in a high-temperature environment, thereby further protecting the working environment of the laser rangefinder 3. At the same time, the base 6 can be slidably installed on the arc-shaped guide rail 7, and the base 6 can drive the entire device to move back and forth on the arc-shaped guide rail 7 to adjust the measuring angle of the laser rangefinder 3.

[0050] like Figure 2 As shown, the base 6 can drive the entire quartz protective cover 4 to reciprocate between points A and B on the arc-shaped guide rail 7. At this time, the base 6 is located at point G. During the movement, the position of the laser rangefinder 3 can remain at point O, achieving the invariance of the laser rangefinder 3's position. At this time, the measurement range of the laser rangefinder is the area traversed by rotating from segment OC to segment OD (or from segment OD to segment OC), and its measurement angle adjustment range is 0° to 90°. Combined with the arc-shaped guide rail 7 on the other side and the laser rangefinder 3, it can completely collect relevant information about the steel billet 2 to be cut. More optimized, the base 6 is equipped with a traction block, which is connected to the computer control system 11 and is used to pull the base 6 to slide back and forth on the arc-shaped guide rail 7 to realize the automatic adjustment of the measurement angle of the laser rangefinder 3.

[0051] In addition, such as Figure 1 As shown, the billet cutting machine 8, the laser rangefinder 3, and the billet weighing device 10 described in this invention are all connected to the computer control system 11. The computer control system 11 can control the operation of the laser rangefinder 3, the billet cutting machine 8, and the billet weighing device 10. The computer control system 11 first receives data from the two laser rangefinders 3, and uses the billet shape detection model in the computer to calculate the received data in order to achieve the function of detecting the shape of the billet.

[0052] After the billet is cut, the billet weighing device 10 will immediately and automatically measure the weight of the cut billet 9 under the control of the computer control system 11, and then transmit the data to the computer control system 11. The received data will be calculated using the billet precision cutting model, and the real density of each section of billet can be corrected online in real time. This will allow for accurate calculation of the real-time cutting position of the next section of billet, ultimately realizing the function of online detection of billet shape and precise cutting.

[0053] Specifically, in combination Figure 3The billet shape detection model described in this invention is established and its operation method is as follows:

[0054] First, under the control of the computer control system 11, two laser rangefinders 3 are started to measure the steel billet, and the cross-sectional shape of the steel billet is generated according to the measurement results. In this invention, the default value generated is a parallelogram ABCD.

[0055] Secondly, the computer automatically calculates the relevant data transmitted from the two laser rangefinders 3 using pre-written and pre-imported program code. Given the lengths of the six sides GB, GA, GD, FA, FD, and FC, and the degrees of the six angles ∠BGA, ∠AGD, ∠BGD, ∠AFD, ∠DFC, and ∠AFC, the lengths of the two sides AC and BD can be calculated using equations (1) and (2). Similarly, in △GAB, the length of AB can be calculated given the lengths of GB and GA and the angle of ∠BGA. In △GAD, the length of AD (same as BC) can be calculated given the lengths of GA and GD and the angle of ∠AGD. In △DFC, the length of CD can be calculated given the lengths of FD and FC and the angle of ∠DFC.

[0056] AC 2 =FA 2 +FC 2 -2FA·FC·cos∠AFC (1)

[0057] BD 2 =GB 2 +GD 2 -2GB·CD·cos∠BGD (2)

[0058] The angle of ∠BAD can be calculated by using equation (3). Similarly, the degrees of ∠ADC, ∠ABC and ∠BCD can also be calculated.

[0059]

[0060] Finally, the area of ​​parallelogram ABCD can be calculated according to equation (4-5).

[0061] AO≡AB·sin∠ABO (4)

[0062]

[0063] Based on the calculation results of formula (1-5), all information about the internal cavity of the billet can be obtained, and the billet can be judged online in real time whether it has been deformed. In this invention, the angle data of ∠BAD can be calculated. When the difference between ∠BAD and 90° does not meet the factory setting value (this value is specified according to the specific production situation), it can be considered that the billet is severely deformed. Then, the problematic part of the billet is cut off in time, which greatly improves the quality of the billet and avoids the problem of being unable to roll in the subsequent billet rolling process.

[0064] Furthermore, the computer control system 11 can accurately determine the real-time cutting position of the next segment of the billet based on the shape information of the internal cavity of the billet and the data transmitted from the billet weighing device 10 using a precise billet cutting model. Figure 3 As shown, the process and operation method for establishing the precision cutting model for steel billets are as follows:

[0065] 1) First, based on the billet shape inspection model, the area of ​​the parallelogram ABCD inside the cut billet cavity can be calculated in real time. Then, by integrating with the length L1 of the cut steel billet, a more accurate volume V1 of the steel billet can be obtained;

[0066] 2) Then, the weight information m1 of the cut steel billet is obtained from the billet weighing equipment. According to the formula (6), the actual density ρ1 of the cut steel billet can be calculated. Then, considering that the density of adjacent steel billets is almost unchanged, the density ρ2 of the next steel billet to be cut is assumed to be approximately equal to the actual density ρ1 of the cut steel billet, as shown in formula (7).

[0067]

[0068] ρ2≈ρ1 (7)

[0069] The volume V2 of the billet to be cut can be calculated based on the target weight M fixed by the steel plant and the density ρ2 of the billet to be cut, as shown in equation (8).

[0070] Finally, the area of ​​the parallelogram ABCD inside the steel billet cavity is calculated in real time using data transmitted from two laser rangefinders 3. The area and length are integrated in real time. Once the integrated volume reaches the target steel billet volume V2, the computer control system will immediately operate the steel billet cutting machine 8 to cut the steel billet. At the same time, the cut steel billet will continue to be weighed to determine the true density of the freshly cut steel billet. This allows for continuous online correction of the true density of the steel billet in the computer, which is then used as the density of the next segment of the steel billet. This achieves the function of precise steel billet cutting and greatly improves the economic efficiency of the enterprise.

[0071]

[0072] like Figure 4 As shown, the present invention provides a method for online detection of billet shape and precise cutting, comprising the following steps:

[0073] Step A: The computer control system 11 controls two laser rangefinders 3 to measure the data of the steel billet 2 to be cut, and uploads the measurement results to the computer control system 11 in real time.

[0074] Step B: The computer control system 11 uses the billet shape detection model to calculate the shape data of the internal cavity of the billet 2 to be cut in real time, thereby determining whether the billet has been deformed. If the deformation occurs and the degree of deformation exceeds the preset value, the deformed part is cut off and removed until the billet is no longer deformed or the degree of deformation meets the standard before continuing to the next step.

[0075] Step C: The computer control system 11 uses the billet precision cutting model to calculate the density of the billet cut in the previous cut, and combines it with the data returned by the laser rangefinder to determine the accurate cutting position of the next section of billet in real time.

[0076] Step D: When the computer control system 11 determines that the billet has reached the target volume (i.e., the target weight), the computer control system 11 will immediately operate the billet cutting machine 8 to cut the billet.

[0077] Step E: The cut steel billet 9 will be weighed to determine its true density, thereby continuously correcting the true density of the next steel billet online, thus achieving the function of precise steel billet cutting;

[0078] Step F: The computer control system 11 determines whether the steel billet has been completely cut. If the steel billet has not been completely cut, continue from step C to step F. If the steel billet has been completely cut, record the current steel billet density, which will be used as the initial density of the steel billet for the next cut.

[0079] Step G: End.

[0080] The present invention will be further described below with reference to specific embodiments.

[0081] Example 1

[0082] Combination Figure 3In this embodiment, the above technical solution is adopted, and the deformation angle of the billet is set to 15°. That is, if the difference between ∠BAD and 90° exceeds 15°, the billet is considered to be severely deformed and needs to be cut and removed. The relevant information of the billet is measured in real time using a laser rangefinder 3: GB=1937mm, GA=1788mm, GD=1967mm, FA=1946mm, FD=1802mm, FC=2001mm, ∠BGA=4.7°, ∠AGD=4.9°, ∠BGD=9.6°, ∠AFD=4.8°, ∠DFC=5.0°, ∠AFC=9.8°. The lengths of the two sides AC and BD can be calculated using formulas (1) and (2), where AC=341.6mm and BD=328.0mm.

[0083] Similarly, the lengths of AB, AD, CD and BC can be calculated, which are AB = CD = 213.3 mm and AD = BC = 240.3 mm respectively.

[0084] The angle of ∠BAD can be calculated by using equation (3), ∠BAD = 92.4°.

[0085] Finally, the area of ​​parallelogram ABCD can be calculated using equation (4-5). This allows for real-time access to all information about the internal cavity of the billet, facilitating online real-time assessment of whether the billet has deformed.

[0086] like Figure 1 and Figure 4 As shown, the computer control system 11 can accurately determine the real-time cutting position of the next section of the billet based on the shape information of the internal cavity of the billet and the data transmitted from the billet weighing equipment using a precise billet cutting model. Figure 3 As shown, the process and operation method for establishing the precision cutting model for steel billets are as follows:

[0087] 1) First, based on the billet shape inspection model, the area of ​​the parallelogram ABCD inside the cut billet cavity can be calculated in real time. Then, the length L of the cut steel billet 9 例1-1 Integral calculations are performed to obtain a more accurate volume V of the steel billet. 例1-1 ;

[0088] 2) Then, obtain the weight information m of the cut steel billet 9 from the billet weighing device 10. 例1-1 According to equation (6), the actual density ρ of the cut steel billet 9 can be calculated. 例1-1 Considering that the density of adjacent steel billets is almost constant, the density ρ of the next steel billet to be cut is assumed to be the same. 例1-2 The density ρ is approximately equal to the actual density of the cut steel billet 9. 例1-1 .

[0089] 3) Based on the target weight M fixed by the steel mill and the density ρ of the steel billet 2 to be cut. 例1-2 The required volume V of the steel billet to be cut can be calculated. 例1-2 As shown in equation (8). Finally, the area of ​​the parallelogram ABCD inside the steel billet cavity is calculated in real time using data transmitted from two laser rangefinders 3. The area and length are integrated in real time. Once the integrated volume reaches the target steel billet volume V, the calculation is performed. 例1-2 At the same time, the computer control system 11 will immediately operate the billet cutting machine 8 to cut the billet. Simultaneously, the cut billet 9 will continue to be weighed to determine the true density of the freshly cut billet. This allows for continuous online correction of the true density of the billet in the computer, which is then used as the density of the next billet segment to achieve precise billet cutting, greatly improving the company's economic efficiency.

[0090] Example 2

[0091] The billet cutting method in this embodiment is basically the same as that in Embodiment 1, except that:

[0092] Given the angles GB = 2003mm, GA = 1764mm, GD = 1993mm, FA = 1987mm, FD = 1809mm, FC = 2012mm, ∠BGA = 4.9°, ∠AGD = 4.8°, ∠BGD = 9.7°, ∠AFD = 4.7°, ∠DFC = 5.1°, and ∠AFC = 9.8°, we can calculate AC = 342.5mm and BD = 338.0mm using formulas (1) and (2). Similarly, we can calculate the lengths of AB, AD, CD, and BC, which are AB = CD = 288.0mm, AD = BC = 277.7mm, respectively.

[0093] The angle of ∠BAD can be calculated using formula (3), and ∠BAD = 73.36°. If the difference between the degree of ∠BAD and 90° exceeds 15°, the billet is in a state of severe deformation and should be cut immediately.

[0094] Laser rangefinder 3 continues scanning until the difference between ∠BAD and 90° is less than or equal to 15°. At this point, the cutting operation resumes, and the defective section of the billet is removed. The real-time cross-sectional data of the compliant billet obtained by laser rangefinder 3 is as follows:

[0095] Given the six angles GB = 1964mm, GA = 1786mm, GD = 1968mm, FA = 1950mm, FD = 1803mm, FC = 2002mm, ∠BGA = 4.7°, ∠AGD = 4.8°, ∠BGD = 9.5°, ∠AFD = 4.8°, ∠DFC = 4.9°, and ∠AFC = 9.6°, we can calculate AC = 334.7mm and BD = 325.6mm using formulas (1) and (2). Similarly, we can calculate the lengths of AB, AD, CD, and BC, which are AB = CD = 235.1mm, AD = BC = 240.4mm, respectively.

[0096] The angle of ∠BAD can be calculated using formula (3), ∠BAD=86.44°.

[0097] Finally, the area of ​​parallelogram ABCD can be calculated using formulas (4) to (5). This allows for real-time access to all information about the internal cavity of the billet, facilitating online real-time assessment of whether the billet has deformed.

[0098] like Figure 1 and Figure 4 As shown, the computer control system 11 can accurately determine the real-time cutting position of the next section of the billet based on the shape information of the internal cavity of the billet and the data transmitted from the billet weighing device 10 using the billet precision cutting model. Figure 3 As shown, the process and operation method for establishing the precision cutting model for steel billets are as follows:

[0099] 1) First, based on the billet shape inspection model, the area of ​​the parallelogram ABCD inside the cut billet cavity can be calculated in real time. Then, the length L of the cut steel billet 9 例2-1 Integral calculations are performed to obtain a more accurate volume V of the steel billet. 例2-1 ;

[0100] 2) Then, obtain the weight information m of the cut steel billet 9 from the billet weighing device 10. 例2-1 According to equation (6), the actual density ρ of the cut steel billet 9 can be calculated. 例2-1 Considering that the density of adjacent steel billets is almost constant, the density ρ of the next steel billet to be cut is assumed to be the same. 例2-2 The density ρ is approximately equal to the actual density of the cut steel billet 9. 例2-1 .

[0101] 3) Based on the target weight M fixed by the steel mill and the density ρ of the steel billet 2 to be cut. 例2-2 The required volume V of the steel billet to be cut can be calculated. 例2-2As shown in equation (8). Finally, the area of ​​the parallelogram ABCD inside the steel billet cavity is calculated in real time using data transmitted from two laser rangefinders 3. The area and length are integrated in real time. Once the integrated volume reaches the target steel billet volume V, the calculation is performed. 例2-2 At that time, the computer control system 11 will immediately operate the billet cutting machine 8 to cut the billet. At the same time, the cut billet will continue to be weighed to determine the true density of the billet that has just been cut off. This allows for continuous online correction of the true density of the billet in the computer, which will then be used as the density of the next billet segment, thus achieving the function of precise billet cutting.

[0102] The present invention has been described in detail above with reference to specific exemplary embodiments. However, it should be understood that various modifications and variations can be made without departing from the scope of the invention as defined by the appended claims. The detailed description and drawings should be considered illustrative only and not restrictive, and any such modifications and variations shall fall within the scope of the invention described herein. Furthermore, the background art is intended to illustrate the current state of development and significance of the technology and is not intended to limit the present invention or the scope of application of the present application.

[0103] More specifically, although exemplary embodiments of the invention have been described herein, the invention is not limited to these embodiments, but includes any and all embodiments modified, omitted, such as combinations between various embodiments, adaptive changes, and / or substitutions, as would be apparent to those skilled in the art from the foregoing detailed description. The limitations in the claims are to be interpreted broadly as used in the language of the claims and are not limited to the examples described in the foregoing detailed description or during the implementation of this application, which should be considered non-exclusive. Any step listed in any method or process claim may be performed in any order and is not limited to the order set forth in the claims. Therefore, the scope of the invention should be determined solely by the appended claims and their legal equivalents, and not by the description and examples given above.

Claims

1. An online device for detecting the shape of steel billets and for precise cutting, comprising a steel billet cutting machine (8) and a computer control system (11), characterized in that: It also includes a laser rangefinder (3) and a billet weighing device (10), wherein: Two laser rangefinders (3) are provided, located on both sides of the steel billet (2) to be cut, and both laser rangefinders (3) are installed in the cooling protection equipment for real-time online detection of the shape of the steel billet (2); the cross-sectional shape of the steel billet (2) is a parallelogram, and the area calculation process of the parallelogram ABCD is as follows: The computer automatically calculates the relevant data transmitted from the two laser rangefinders (3) using pre-written and pre-imported program code. Given the lengths of the six sides GB, GA, GD, FA, FD, and FC, and the degrees of the six angles ∠BGA, ∠AGD, ∠BGD, ∠AFD, ∠DFC, and ∠AFC, the lengths of the two sides AC and BD can be calculated using formulas (1) and (2). Similarly, in △GAB, the length of AB can be calculated given the lengths of GB and GA and the angle of ∠BGA. In △GAD, the length of AD can be calculated given the lengths of GA and GD and the angle of ∠AGD. In △DFC, the length of CD can be calculated given the lengths of FD and FC and the angle of ∠DFC. The angle of ∠BAD can be calculated by using equation (3), and the degrees of ∠ADC, ∠ABC and ∠BCD can also be calculated by the same method; Finally, the area of ​​parallelogram ABCD can be calculated according to equation (4-5): The billet weighing device (10) is used to weigh the cut billet (9); The billet cutting machine (8), laser rangefinder (3) and billet weighing device (10) are all connected to the computer control system (11); It also includes a base (6) and an arc-shaped guide rail (7). The quartz protective cover (4) is fixedly connected to the base (6), and the base (6) can be slidably installed on the arc-shaped guide rail (7). The base (6) is equipped with a traction block, which is connected to the computer control system and is used to pull the base (6) to slide on the arc-shaped guide rail (7) to adjust the measurement angle of the laser rangefinder (3).

2. The device for online detection of billet shape and precise cutting according to claim 1, characterized in that: The cooling protection device includes a quartz protective cover (4), which is a box structure and covers the surface of the laser rangefinder (3). The entire outer shell of the quartz protective cover (4) is processed into a double layer, and the double-layer shell is filled with circulating cooling water. Heat-insulating glass (5) is processed on the shell at the laser emission point of the laser rangefinder (3).

3. The device for online detection of billet shape and precise cutting according to claim 2, characterized in that: The heat-insulating glass (5) is made of AR glass and is designed as a double-layer structure.

4. The device for online detection of billet shape and precise cutting according to claim 1, characterized in that: The base (6) is made of stainless steel. The outer shell of the base (6) is also processed into a double layer and is connected to the quartz protective cover (4) shell. The base (6) shell is filled with circulating cooling water.

5. The device for online detection of billet shape and precise cutting according to claim 1, characterized in that: The measurement angle adjustment range of each laser rangefinder (3) is 0°~90°.

6. A method for online inspection and precise cutting of steel billet shape, characterized in that: The billet data is collected using the device described in any one of claims 1-5, the collected data is processed, and the billet cutting machine (8) is controlled by the computer control system (11) to perform automatic cutting.

7. The method for online inspection and precise cutting of steel billet shape according to claim 6, characterized in that: Including the following methods: Step 1: The computer control system (11) controls the two laser rangefinders (3) to work, receives the data transmitted from the two laser rangefinders (3), processes the received data, calculates the cross-sectional shape data of the steel billet, and detects whether the shape of the steel billet has been deformed. Step 2: If deformation occurs and the degree of deformation exceeds the preset value, cut off and remove the deformed part until the billet is no longer deformed or the degree of deformation meets the standard before proceeding to the next step. Step 3: Calculate the target volume of the billet to be cut based on the target weight of the billet and the density of the billet (9) after the previous section is cut as the initial density, and calculate the current volume of the billet in real time in combination with the shape detection data. When the volume reaches the target volume, the billet cutting machine (8) is controlled by the computer control system (11) to cut the billet. Step 4: Weigh the cut steel billet (9) to obtain its true weight, and transmit the weight data to the computer control system (11). Combine the steel billet volume data to calculate the true density, record it in the system, realize density correction, and use the true density as the initial density for the next steel billet cutting to guide the next steel billet cutting. Step 5: Repeat steps 1 to 4 above until the entire billet is cut.

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