Multifunctional measuring system and method for hot-rolled strip steel based on X rays

Abstract

The invention discloses an X-ray-based multifunctional measurement system and method for hot rolled strip steel, and relates to the technical field of industrial measurement. Comprising the steps that after strip steel enters a measuring station, a high-voltage X-ray tube emits X-rays, and the X-rays are received by a ray detection array after penetrating through the strip steel; the grating projection system projects a grating array to the surface of the strip steel, and the high-speed camera shoots the shape of a grating line in real time; measuring the X-ray intensity of each point according to the ray detection array to obtain the thickness distribution on the cross section of the strip steel; according to the grating line deformation data and shape, height distribution, inclination angle and width of the strip steel surface are obtained, and thickness measurement data are corrected; and dynamically displaying a thickness distribution curve, a central convexity curve, a straightness distribution curve, a width curve and a central deviation curve of the strip steel on an interface. According to the application, an operator can master the change conditions of key parameters such as convexity, straightness and width of the steel plate in real time, and the rolling mill parameters can be quickly adjusted according to the measurement result.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial measurement, and particularly relates to a multi-functional measurement system and method for hot-rolled strip steel based on X-rays. Background Art

[0002] During the production process of hot-rolled strip steel, the convexity, flatness, and width of the strip steel are key parameters that determine the product quality. These parameters directly affect the subsequent processing performance and service performance of the strip steel, such as applications in automobile manufacturing, household appliance production, and building structures. Traditional measurement methods usually rely on off-line detection or on-line measurement of a single parameter, and cannot achieve comprehensive real-time monitoring of multiple parameters. Off-line detection not only takes a long time but also cannot timely feedback problems in the production process, resulting in lagging process adjustment; while on-line measurement of a single parameter can provide real-time data, but cannot comprehensively reflect the overall quality status of the strip steel, and it is difficult to meet the requirements of modern high-efficiency and high-quality production.

[0003] In addition, there is a lack of a method in the prior art that can simultaneously measure the convexity, flatness, and width of the strip steel and display the measurement results on the interface in real time. This technical defect makes it difficult for operators to quickly obtain comprehensive quality information during the production process, unable to timely adjust the rolling mill parameters, thus affecting the stability and consistency of product quality. At the same time, due to the lack of support from comprehensive data, process optimization and quality traceability in the production process also face great difficulties, further restricting the improvement of production efficiency and product competitiveness.

[0004] Traditional measurement methods require roll removal operations, which not only increase the downtime of the production line but also reduce production efficiency. At the same time, due to the influence of high-temperature radiation and cooling water vapor in the hot-rolling environment, the measurement components are easily affected by heat interference, resulting in a decrease in measurement accuracy and even equipment failures. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-functional measurement system and method for hot-rolled strip steel based on X-rays, enabling operators to grasp the changes in key parameters such as the convexity, flatness, and width of the strip steel in real time.

[0006] To achieve the above purpose, the present application proposes a multi-functional measurement system for hot-rolled strip steel based on X-rays, including:

[0007] An X-ray thickness measurement module, including a high-voltage X-ray tube and a ray detection array, where the high-voltage X-ray tube is used to generate X-rays, and the ray detection array is used to receive the X-rays after penetrating the strip steel to be measured;

[0008] A grating projection module, including a grating projection system and a high-speed camera, where the grating projection system is used to form a grating array on the surface of the strip steel; the high-speed camera is used to capture the shape of the grating lines in real time;

[0009] A data processing module, which obtains the thickness distribution of the strip according to the parameters of the high-voltage X-ray tube and the ray detection array, and further obtains the center convexity, wedge and edge thinning parameters; realizes the flatness and width measurement of the strip according to the change and shape of the grating lines, and performs angle compensation and correction on the thickness measurement result;

[0010] An interface display module, which dynamically displays the thickness distribution curve, center convexity curve, flatness distribution curve, width curve and center deviation curve of the strip.

[0011] In one embodiment, it further includes: a data repository for storing the center convexity, wedge, edge thinning, flatness, width measurement and angle compensation parameters of the strip.

[0012] In one embodiment, the method for performing angle compensation and correction on the thickness measurement result is:

[0013] h = h′cos(α + β)

[0014] Wherein, h represents the actual thickness of the steel plate; h' represents the projected thickness along the X-ray path; α represents the inclination angle of the steel plate surface relative to the X-ray path; β represents the calibration angle of the grating projection direction.

[0015] In one embodiment, the X-ray thickness measurement module and the grating projection module are both located on the sliding frame body. The upper part of the sliding frame body is a box body, and the lower part is a C-shaped frame; wherein the high-voltage X-ray tube, the grating projection system and the Moiré camera are placed in the box body, and the ray detection array is located on the C-shaped frame.

[0016] In one embodiment, the wall of the box body and the wall of the C-shaped frame have a connected circulating water cooling channel, and the circulating water cooling channel has a cooling water inlet and a cooling water outlet. The cooling water inlet and the cooling water outlet are both connected to the water cooler to provide constant temperature circulating water for the sliding frame body.

[0017] In one embodiment, pulleys are connected to both sides of the C-shaped frame, and the pulleys move on the I-beam slide rails. The I-beam slide rails are symmetrically arranged on the on-site support. The on-site support includes a measurement station and a maintenance station, and the sliding frame body moves between the measurement station and the maintenance station.

[0018] In one embodiment, a driving motor is provided on the C-shaped frame, a gear is provided on the output shaft of the driving motor, and the gear is connected to the rack on the on-site support to realize the automatic movement of the sliding frame body between the measurement station and the maintenance station.

[0019] In one embodiment, the C-shaped frame includes a first support frame arranged horizontally; a connecting frame arranged vertically and a second support frame arranged horizontally. Pulleys are connected to both sides of the first support frame. The connecting frame passes through the gap of the on-site support maintenance station. The second support frame is located below the strip roller. The X-rays emitted by the high-voltage X-ray tube pass through the gap between the strip rollers and are received by the ray detection array.

[0020] This embodiment provides a multi-functional measurement method for hot-rolled strip based on X-rays, including:

[0021] After the strip enters the measurement station, the high-voltage X-ray tube emits X-rays that can cover the strip. The X-rays penetrate the strip and are received by the ray detection array;

[0022] The grating projection system projects a grating array onto the surface of the strip, and the high-speed camera captures the shape of the grating lines in real time;

[0023] The data processing module measures the X-ray intensity of each point according to the ray detection array, obtains the thickness distribution on the cross-section of the strip, and further obtains the center convexity, wedge and edge thinning parameters; according to the grating line deformation data and shape, obtains the height distribution, tilt angle and width of the strip surface, and corrects the thickness measurement data based on the height distribution and tilt angle;

[0024] The thickness distribution curve, center convexity curve, flatness distribution curve, width curve, and center deviation curve of the strip are dynamically displayed on the interface.

[0025] In one embodiment, when the center convexity, flatness, width, and center deviation exceed the set range, the interface displays an alarm prompt, and the operator adjusts the mill parameters according to the prompt.

[0026] The above technical solutions adopted by the present invention, compared with the prior art, have the following advantages:

[0027] This application enables the operator to grasp the changes of key parameters such as the convexity, flatness and width of the steel plate in real time, and quickly adjust the mill parameters according to the measurement results. In addition, the data repository is used to query historical data and trend analysis, providing data support for process optimization and quality traceability, thereby comprehensively improving the intelligent level and product quality of hot-rolled steel plate production.

[0028] By measuring the flatness and width of the strip in real time, problems in the production process can be discovered in time, the production of unqualified products can be avoided, the scrap rate can be reduced, and the production cost can be lowered. In addition, the flatness and width measurement can ensure the consistency of the strip products, meeting the high requirements of customers for product specifications and quality.

[0029] The main devices such as the high-voltage X-ray tube, the grating projection mechanism, and the Moiré camera are centrally arranged in the upper box body, while only the ray detection array is arranged in the lower part of the C-shaped frame. This design significantly reduces the volume of the lower part of the C-shaped frame, enabling an ultra-narrow measurement line. The measurement can be completed through the existing roll gap without removing the rolls, greatly improving the production efficiency. The upper box body can effectively isolate external heat and humidity, protecting the internal devices from the influence of high-temperature environments. When the C-shaped frame retreats to the maintenance station, only the side guard plate of the box body needs to be opened for comprehensive maintenance, which is simple to operate. In addition, the on-site support only needs to be fixed with anchor bolts without laying tracks, with simple construction, reducing the installation and maintenance costs. Description of the Drawings

[0030] Figure 1 It is the schematic diagram of the multi-functional measurement system for hot-rolled strip based on X-ray;

[0031] Figure 2 It is the schematic diagram for angle compensation of the thickness measurement result;

[0032] Figure 3 It is the schematic diagram for flatness and width measurement;

[0033] Figure 4 It is the schematic diagram of the sliding frame structure;

[0034] Figure 5 It is the schematic diagram of the camber measurement module;

[0035] Wherein: 1. C-shaped frame, 11. First support frame, 111. Pulley, 12. Connecting frame, 13. Second support frame, 2. Box body, 3. Moiré camera, 4. High-voltage X-ray tube, 5. Grating projection mechanism, 6. On-site support, 61. I-beam slide rail, 7. Ray detection array, 8. Strip steel, 9. Strip steel roller;

[0036] 101. Water chiller; 102. Lower computer; 103. Upper computer; 104. Display terminal. Detailed Implementation Modes

[0037] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more unless otherwise specifically defined. "Several" means one or more unless otherwise specifically defined.

[0040] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of this application.

[0041] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] Embodiment 1

[0043] As Figure 1 shown, this embodiment provides a multi-functional measurement system for hot-rolled strip steel based on X-rays, including:

[0044] An X-ray thickness measurement module, including a high-voltage X-ray tube and a ray detection array. The high-voltage X-ray tube is used to generate high-energy X-rays, and the intensity attenuates after penetrating the strip steel. The ray detection array: consists of high-density detection units and is used to receive the X-rays after penetrating the strip steel and measure the thickness distribution on the cross-section of the strip steel. Here, it should be noted that the thickness of the strip steel is obtained through the X-ray attenuation law, and then parameters such as center convexity, wedge, and edge thinning are obtained.

[0045] The grating projection module includes a grating projection system and a high-speed camera. The grating projection system projects a regular stripe grating onto the strip surface to form a grating array. The high-speed camera captures the grating pattern on the strip surface in real time to detect the deformation of the grating lines. It should be noted here that by analyzing the deformation and shape of the grating lines, the flatness and width of the strip are obtained, and the angle compensation correction is performed on the thickness measurement result. Preferably, the grating projection system may include a light source, a grating sheet, and a projection lens. The light source uses a high-brightness and high-stability LED or laser light source to ensure the clarity and stability of the grating lines. The grating sheet is the core optical element for generating the grating lines. The projection lens is used to project the grating lines on the grating sheet onto the strip surface to ensure the clarity and uniformity of the grating lines. The high-speed camera can be a Moiré camera.

[0046] The data processing module, namely the host computer, obtains the thickness distribution across the strip cross-section based on the data from the X-ray thickness measurement module, and generates the center crown, wedge, and edge drop parameters. Based on the data from the grating projection module, it analyzes the wave height and width deviation on the strip surface. Through the tilt angle measured by the grating projection system, geometric correction is performed on the thickness measurement result to eliminate the influence of strip surface deformation on the measurement accuracy.

[0047] The interface display module real-time displays the thickness distribution curve, center crown curve, flatness distribution curve, width curve, and center deviation curve of the strip through a display terminal. When the measurement parameters exceed the set range, the interface displays an alarm message to prompt the operator to adjust the mill parameters or process parameters.

[0048] The data repository stores the center crown, wedge, edge drop, flatness, width measurement data, and angle compensation parameters of the strip. It supports querying historical measurement data according to conditions such as time and coil number, generating trend analysis charts, and providing data support for production process optimization by analyzing historical data.

[0049] As Figure 2 shown, during the X-ray thickness measurement, due to possible tilt or wave deformation on the strip surface, there will be a deviation between the actual penetration thickness of the X-ray path and the true thickness of the steel plate. To eliminate this geometric error, an angle compensation correction technique based on grating projection is adopted, and the specific implementation method is as follows:

[0050] h = h′cos(α + β)

[0051] where h represents the actual thickness of the steel plate; h' represents the projected thickness along the X-ray path; α represents the tilt angle of the steel plate surface relative to the X-ray path; β represents the calibration angle of the grating projection direction. This technique not only improves the absolute accuracy of thickness measurement but also provides a reliable data basis for the real-time adjustment and quality traceability of the hot rolling process.

[0052] AsFigure 3 As shown in the figure, the sliding frame body includes an upper box body and a lower C-shaped frame. The high-voltage X-ray tube, the grating projection system, and the high-speed camera are placed inside the box body, and the ray detection array is located on the C-shaped frame. The wall of the box body and the wall of the C-shaped frame have a connected circulating water cooling channel for providing constant-temperature cooling water for the sliding frame body; the water chiller provides constant-temperature circulating water for the sliding frame body to ensure the stable operation of the equipment in a high-temperature environment, and the water chiller is controlled by a lower computer. The I-beam slide rails are symmetrically arranged on the on-site support, and pulleys are connected to both sides of the C-shaped frame, and the pulleys move on the I-beam slide rails. Preferably, a driving motor controlled by a lower computer is provided on the C-shaped frame, a gear is provided on the output shaft of the driving motor, and the gear is connected in cooperation with the rack on the on-site support to realize the automatic movement of the sliding frame body between the measurement station and the maintenance station. In this application, the on-site support is fixed by anchor bolts to ensure the stability of the equipment during operation.

[0053] As Figure 4 shown, as the preferred implementation provided in this embodiment, the C-shaped frame includes a horizontally arranged first support frame, a vertically arranged connecting frame, and a horizontally arranged second support frame. Pulleys are connected to both sides of the first support frame, and the connecting frame passes through the gap at the maintenance station of the on-site support. The second support frame is located below the strip roller, and the X-rays emitted by the high-voltage X-ray tube pass through the gap between the strip rollers and are received by the ray detection array. The widths of the connecting frame and the second support frame are smaller than the widths of the first support frame and the box body, further optimizing the space utilization rate and being suitable for installation on the existing production line. And there is no need to remove the rollers, which greatly improves the production efficiency.

[0054] This system is applicable to the hot-rolled strip production line, can real-time monitor the crown, flatness and width of the strip, provide data support for the adjustment of rolling mill parameters, and thus improve the product quality and production efficiency.

[0055] Embodiment 2

[0056] This embodiment provides a multifunctional measurement method for hot-rolled strips based on X-rays, including:

[0057] The strip enters the measurement station, the high-voltage X-ray tube emits high-energy X-rays, and the rays cover the entire width range of the strip; after the rays penetrate the strip, they are received by the ray detection array below; the detection array consists of high-density detection units and can simultaneously measure the X-ray intensities of multiple points on the cross-section of the strip; according to the X-ray attenuation law, the data processing module obtains the thickness distribution on the cross-section of the strip and generates parameters such as center crown, wedge, and edge thinning.

[0058] The grating projection system projects a regular striped grating onto the strip surface, and the high-speed camera captures the grating pattern on the strip surface in real time to detect the deformation of the grating lines. The data processing module analyzes the deformation of the grating lines to obtain the height distribution and tilt angle of the strip surface. The actual width and center deviation of the strip are obtained through the deformation of the grating pattern at the strip edge. According to the tilt angle measured by the grating projection system, geometric correction is performed on the thickness measurement results of the X-ray thickness measurement module to eliminate the influence of the strip surface deformation on the measurement accuracy.

[0059] The thickness distribution across the strip is displayed in real time, with the center thickness, edge thickness, and local high points marked; the changing trend of the center camber of the strip is displayed, with the camber value marked; the flatness distribution of the strip is displayed, with the wave height and position marked; the changing trend of the strip width is displayed, with the width value and center deviation marked; the deviation between the strip center line and the rolling center line is displayed.

[0060] When the center camber, flatness, width, or center deviation exceeds the set range, an alarm prompt is displayed on the interface; the operator adjusts the mill parameters (such as rolling force, roll gap setting, etc.) according to the alarm prompt to ensure product quality.

[0061] This method realizes the multi-functional measurement of the thickness, camber, flatness, and width of hot-rolled strips through the combination of X-ray thickness measurement and grating projection technology. Through the angle compensation and correction of the data processing module and the dynamic display of the interface display module, high-precision and real-time measurement data can be provided for the hot-rolling production line. When the measurement parameters exceed the set range, an alarm prompt will be issued, and the operator can adjust the mill parameters according to the prompt to ensure product quality and production efficiency. This method provides a comprehensive solution for the intelligent production of hot-rolled steel plates.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A multifunctional measurement system for hot-rolled strip steel based on X-ray, characterized in that: include: An X-ray thickness measurement module, comprising a high-voltage X-ray tube and a ray detection array, wherein the high-voltage X-ray tube is used to generate X-rays, and the ray detection array is used to receive the X-rays that penetrate the measured strip; The grating projection module includes a grating projection system and a high-speed camera. The grating projection system is used to form a grating array on the surface of the strip; the high-speed camera is used to capture the shape of the grating lines in real time; The data processing module obtains the thickness distribution of the strip according to the parameters of the high-voltage X-ray tube and the ray detection array, and then obtains the parameters of the center convexity, wedge shape and edge thinning; the straightness and width of the strip are measured according to the changes and shapes of the grating lines, and the angle compensation correction is performed on the thickness measurement results; The interface display module dynamically displays the thickness distribution curve, center convexity curve, flatness distribution curve, width curve, and center deviation curve of the strip.

2. According to claim 1, a multifunctional measurement system for hot-rolled strip based on X-rays is characterized in that: Also includes: Data repository for strip center crown, wedge and edge thinning, straightness, width measurement, angle compensation parameters.

3. According to claim 1, a multifunctional measurement system for hot-rolled strip based on X-rays is characterized in that: The angle compensation correction method for thickness measurement results is: h=h'cos(α+β) Wherein, h represents the actual thickness of the steel plate; h' represents the projected thickness along the X-ray path; α represents the inclination angle of the steel plate surface relative to the X-ray path; β represents the calibration angle of the grating projection direction.

4. The multifunctional measurement system for hot-rolled strip steel based on X-ray according to claim 1, characterized in that: The X-ray thickness measurement module and the grating projection module are both located on a sliding frame, the upper part of which is a box body and the lower part is a C-shaped frame; wherein the high-voltage X-ray tube, the grating projection system and the moiré camera are placed in the box body, and the ray detection array is located on the C-shaped frame.

5. The multifunctional measurement system for hot-rolled steel strip based on X-ray according to claim 4, characterized in that: The wall of the box body and the wall of the C-shaped frame have a connected circulating water cooling channel, and the circulating water cooling channel has a cooling water inlet and a cooling water outlet. The cooling water inlet and the cooling water outlet are both connected to a water cooler to provide constant temperature circulating water for the sliding frame.

6. The multifunctional measurement system for hot-rolled strip based on X-ray according to claim 4, characterized in that: Pulleys are connected to both sides of the C-shaped frame, and the pulleys move on I-beam slide rails. The I-beam slide rails are symmetrically arranged on the on-site bracket. The on-site bracket includes a measuring station and an overhaul station, and the sliding frame moves between the measuring station and the overhaul station.

7. The multifunctional measurement system for hot-rolled steel strip based on X-ray according to claim 6, characterized in that: The C-shaped frame is provided with a driving motor, and the output shaft of the driving motor is provided with a gear, which is matched and connected with the rack on the on-site bracket to realize the automatic movement of the sliding frame between the measuring station and the maintenance station.

8. The multifunctional measurement system for hot-rolled steel strip based on X-ray according to claim 1, characterized in that: The C-shaped frame includes a first support frame arranged horizontally; a connecting frame arranged vertically and a second support frame arranged horizontally, wherein pulleys are connected to both sides of the first support frame, the connecting frame passes through the gap of the on-site support maintenance station, wherein the second support frame is located below the strip steel rollers, and the X-rays emitted by the high-voltage X-ray tube pass through the gaps between the strip steel rollers and are received by the ray detection array.

9. A multifunctional measurement method for hot-rolled strip steel based on X-ray, characterized in that: include: After the steel strip enters the measuring station, the high-voltage X-ray tube emits X-rays that can cover the steel strip. The X-rays penetrate the steel strip and are received by the ray detection array. The grating projection system projects the grating array onto the strip surface, and the high-speed camera captures the shape of the grating lines in real time; The data processing module measures the X-ray intensity at each point based on the ray detection array, obtains the thickness distribution on the cross section of the strip, and then obtains the center convexity, wedge shape and edge thinning parameters; obtains the height distribution, inclination angle and width of the strip surface based on the grating line deformation data and shape, and corrects the thickness measurement data based on the height distribution and inclination angle; The strip thickness distribution curve, center convexity curve, straightness distribution curve, width curve and center deviation curve are dynamically displayed on the interface.

10. A multifunctional measurement method for hot-rolled strip based on X-ray according to claim 9, characterized in that: When the center convexity, straightness, width, and center deviation exceed the set range, the interface displays an alarm prompt and the operator adjusts the rolling mill parameters according to the prompt.

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