Intelligent sizing equipment for seamless steel pipe processing

Abstract

The present invention discloses an intelligent sizing device for seamless steel pipe processing, comprising a workbench, at least two sets of three-roller sizing mechanisms, a drive device, a visual monitoring box, and a control device. The at least two sets of three-roller sizing mechanisms are spaced apart on the workbench, and the drive device is connected to the three-roller sizing mechanisms. The visual monitoring box is located on the workbench and is used to capture images of the seamless steel pipe. The control device is connected to the three-roller sizing mechanisms and the visual monitoring box. The control device includes a diameter detection unit for analyzing the image to determine whether the outer diameter of the seamless steel pipe meets a predetermined value. When the outer diameter of the seamless steel pipe does not meet the predetermined value, a control instruction is output to the drive device, which controls the speed difference between the rollers of each set of three-roller sizing mechanisms through the drive device, thereby adjusting the axial tension applied to the seamless steel pipe. The present invention combines visual monitoring with an intelligent control system to significantly improve the accuracy and efficiency of seamless steel pipe sizing processing.

Description

Technical Field

[0001] The invention relates to seamless steel pipe processing equipment, in particular to an intelligent sizing equipment for seamless steel pipe processing. Background Art

[0002] Seamless steel pipe is a type of steel pipe without welds, manufactured primarily through processes such as hot rolling, cold rolling, or cold drawing. It is widely used in the oil and gas, boiler, shipbuilding, machinery manufacturing, automotive, aerospace, and other fields, and is widely favored for its high strength, high pressure resistance, corrosion resistance, and excellent mechanical properties.

[0003] Sizing is a critical step in the manufacturing of seamless steel pipes. Its purpose is to ensure that the outer diameter of the steel pipe meets design requirements and satisfies the precision and strength requirements for use. The quality of the sizing process directly affects the dimensional accuracy and surface quality of the steel pipe. Therefore, efficient and accurate sizing is a key technical challenge in seamless steel pipe manufacturing.

[0004] In the related art, the three-roller sizing mechanism is a commonly used sizing device for seamless steel pipes. It consists of three evenly distributed rollers, and a sizing hole is defined between the wheel surfaces of the three rollers. In order to achieve precise control of the diameter of the seamless steel pipe during the sizing process, a laser measuring instrument is usually used to measure the diameter of the steel pipe, and then the spacing between the rollers is adjusted by controlling the hydraulic system to adjust the radial pressure of the steel pipe, thereby controlling the sizing size. However, although the laser measuring instrument has high measurement accuracy, on the one hand, it can only perform single-point measurement on the cross section. This single-point measurement method cannot reflect the diameter changes at different positions of the steel pipe. Therefore, it is difficult to achieve more comprehensive and accurate diameter monitoring. On the other hand, simply adjusting the radial pressure of the rollers is not ideal for the sizing effect, especially since the radial pressure changes the outer diameter and is also likely to affect its inner diameter, resulting in large errors in the inner diameter size. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the purpose of the present invention is to provide an intelligent sizing device for seamless steel pipe processing.

[0006] To achieve the above-mentioned purpose, an intelligent sizing device for seamless steel pipe processing according to an embodiment of the present invention includes:

[0007] Workbench;

[0008] At least two sets of three-roller sizing mechanisms, at least two sets of the three-roller sizing mechanisms are arranged on the workbench at intervals along the conveying direction, for sizing the seamless steel pipe;

[0009] a driving device connected to the three-roller sizing mechanism and configured to drive the rollers of the three-roller sizing mechanism to rotate;

[0010] A visual monitoring box, the visual monitoring box being arranged on the workbench and being located behind at least two groups of the three-roller sizing mechanisms in the conveying direction;

[0011] A material guide rack, arranged side by side with the workbench in the conveying direction, for guiding the seamless steel pipe in the conveying direction;

[0012] A control device connected to the three-roller sizing mechanism and the visual monitoring box;

[0013] The visual monitoring box includes a closed box, a light source and a visual camera. The two opposite walls of the closed box are provided with through holes for the seamless steel pipe to pass through. The light source is arranged in the closed box to provide a lighting environment. The visual camera is arranged in the closed box to collect images of the seamless steel pipe.

[0014] The control device includes a diameter detection unit, which is used to analyze the image to determine whether the outer diameter of the seamless steel pipe meets the predetermined value. When the outer diameter of the seamless steel pipe does not meet the predetermined value, a control instruction is output to the drive device to control and adjust the speed difference of the rolling rollers between each group of the three-roller sizing mechanism through the drive device, thereby adjusting the axial tension on the seamless steel pipe.

[0015] In addition, the intelligent sizing equipment for seamless steel pipe processing according to the above embodiment of the present invention may also have the following additional technical features:

[0016] According to one embodiment of the present invention, there are two visual cameras, one of which is located on the top wall of the closed box to capture a top view image of the seamless steel pipe, and the other of which is located on a side wall of the closed box to capture a side view image of the seamless steel pipe, and the axes of the two visual cameras are perpendicular to each other;

[0017] The control device also includes a roundness detection unit, a straightness detection unit and a defect detection unit. The roundness detection unit is further used to judge the roundness of the seamless steel pipe based on the top view image and the side view image; the straightness detection unit is used to judge the straightness of the seamless steel pipe based on the top view image and the side view image; and the defect detection unit is used to judge the appearance defects of the seamless steel pipe based on the top view image and the side view image.

[0018] According to one embodiment of the present invention, the diameter detection unit includes:

[0019] A first image preprocessing module, configured to preprocess the top view image and the side view image;

[0020] A first contour extraction module is used to extract the axial contour line of the seamless steel pipe from the top view image and the side view image, respectively, to obtain a top view contour image and a side view contour image;

[0021] a first diameter measuring module, configured to measure the top view diameter of the seamless steel pipe in the top view profile image and the side view diameter of the seamless steel pipe in the side view profile image at a plurality of different axial positions;

[0022] The diameter calculation module is used to calculate the average diameter of each axial position and the overall average diameter, where the average diameter of each axial position = (the top view diameter of the axial position + the side view diameter of the axial position) / 2, and the overall average diameter = the average diameter of all axial positions / the number of axial positions.

[0023] According to one embodiment of the present invention, the roundness detection unit includes:

[0024] A second image preprocessing module, configured to preprocess the top view image and the side view image;

[0025] A second contour extraction module is used to extract the axial contour line of the seamless steel pipe from the top view image and the side view image, respectively, to obtain a top view contour image and a side view contour image;

[0026] A second diameter measuring module is used to measure the top view diameter of the seamless steel pipe in the top view profile image and the side view diameter of the seamless steel pipe in the side view profile image at multiple different axial positions;

[0027] The roundness estimation module is used to compare the top view diameter and the side view diameter of the seamless steel pipe at the same axial position, obtain the diameter difference at each axial position, find the maximum diameter difference from each diameter difference, and calculate the roundness estimation value, wherein the roundness estimation value = the maximum diameter difference / 2.

[0028] According to one embodiment of the present invention, the straightness detection unit includes:

[0029] A third image preprocessing module, configured to preprocess the top view image and the side view image;

[0030] an axis extraction module, for extracting the central axis of the seamless steel pipe from the top view image and the side view image respectively;

[0031] A fitting module, configured to perform least squares fitting on the central axes of the top view image and the side view image, respectively, to obtain a top view fitting axis and a side view fitting axis;

[0032] a deviation calculation module, configured to calculate a top-view deviation value from each point on the central axis of the top view image to a corresponding point on the top view fitting axis, and to calculate a side-view deviation value from each point on the central axis of the side view image to a corresponding point on the side view fitting axis;

[0033] The straightness calculation module is used to find the maximum top view deviation value and the maximum side view deviation value, and calculate the straightness value, where the straightness value = max (maximum top view deviation value, maximum side view deviation value).

[0034] According to one embodiment of the present invention, the intelligent sizing device further comprises a sizing inner core, the sizing inner core being arranged on an end of the guide frame away from the workbench, and the sizing inner core extending in the opposite direction of the conveying direction and extending into the seamless steel pipe;

[0035] The sizing inner core extends into one end of the seamless steel pipe and is provided with a sizing column. The outer diameter of the sizing column is configured to be the inner diameter of the seamless steel pipe after forming, and the sizing column is located at the center of the three-roller sizing mechanism.

[0036] According to one embodiment of the present invention, one end of the sizing inner core has a ball head, and one end of the sizing column is universally rotatably matched with the ball head.

[0037] According to one embodiment of the present invention, there are two visual monitoring boxes, and the two visual monitoring boxes are respectively located in front of and behind the three-roller sizing mechanism in the conveying direction;

[0038] A limit switch is provided on the end of the guide rack away from the workbench. When the limit switch detects the seamless steel pipe, the control device controls the drive device to drive the roller to rotate in the opposite direction, so that the seamless steel pipe is transported in the opposite direction, and the secondary sizing of the seamless steel pipe is completed under the visual monitoring of the other one of the two visual monitoring boxes.

[0039] According to one embodiment of the present invention, an adjustable bracket is provided on the end of the material guide rack away from the workbench;

[0040] The adjustable bracket includes a base frame, a sliding seat and an adjustable bolt. The base frame is fixed on the material guide frame. The sliding seat can slide in the up and down directions on the base frame. The adjustable bolt is arranged on the base frame and is located below the sliding seat and is against the sliding seat to adjust the height of the sliding seat. One end of the sizing inner core is fixed on the sliding seat.

[0041] According to an embodiment of the present invention, there are four light sources, and the four light sources are respectively arranged at four corners of the closed box.

[0042] Compared with the prior art, the beneficial effects of the present invention are as follows: the intelligent sizing equipment for seamless steel pipe processing provided by the embodiment of the present invention, combined with visual monitoring and intelligent control systems, significantly improves the accuracy and efficiency of seamless steel pipe sizing processing. The visual monitoring box adopts a closed design, equipped with a light source and a visual camera, which can comprehensively and continuously capture steel pipe images under a stable lighting environment, overcoming the limitations of traditional laser measurement single-point detection. The diameter detection unit in the control device performs real-time analysis on the collected image to accurately determine whether the outer diameter of the steel pipe meets the predetermined value. When an outer diameter deviation is detected, the system automatically generates a control instruction to change the axial tension of the steel pipe by adjusting the speed difference between the rollers of multiple groups of three-roller sizing mechanisms, thereby achieving precise control of the steel pipe size. This dynamic adjustment mechanism based on visual feedback can not only monitor the dimensional changes of the steel pipe more comprehensively, but also minimize the impact on the inner diameter while ensuring the accuracy of the outer diameter, solving the problem of large inner diameter error caused by only adjusting the radial pressure in the traditional method.

[0043] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0045] Figure 1 Schematic diagram of the structure of an intelligent sizing device for seamless steel pipe processing according to an embodiment of the present invention;

[0046] Figure 2 This is a structural diagram from one perspective of a portion of the structure of an intelligent sizing device for seamless steel pipe processing according to an embodiment of the present invention;

[0047] Figure 3 This is a schematic structural diagram of a visual monitoring box in an intelligent sizing device for seamless steel pipe processing according to an embodiment of the present invention;

[0048] Figure 4 This is a schematic structural diagram of a portion of the structure of the intelligent sizing equipment for seamless steel pipe processing according to an embodiment of the present invention (with the cover of the three-roller sizing mechanism removed) from another perspective;

[0049] Figure 5 This is a structural schematic diagram from one perspective of a three-roller sizing mechanism in an intelligent sizing device for seamless steel pipe processing according to an embodiment of the present invention;

[0050] Figure 6 This is a structural schematic diagram from another perspective of the three-roller sizing mechanism in the intelligent sizing equipment for seamless steel pipe processing according to an embodiment of the present invention;

[0051] Figure 7 This is a schematic structural diagram of the cooperation between the sizing inner core and the three-roller sizing mechanism in the intelligent sizing equipment for seamless steel pipe processing according to an embodiment of the present invention;

[0052] Figure 8 This is an end-on schematic diagram of the coordination between the sizing inner core, the rollers, and the seamless steel pipe in the intelligent sizing equipment for seamless steel pipe processing according to an embodiment of the present invention;

[0053] Figure 9 This is a side view schematic diagram of the coordination between the sizing inner core, the rollers and the seamless steel pipe in the intelligent sizing equipment for seamless steel pipe processing according to an embodiment of the present invention;

[0054] Figure 10 The present invention is a schematic structural diagram of a sizing inner core in an intelligent sizing device for seamless steel pipe processing according to an embodiment of the present invention.

[0055] Reference numerals:

[0056] 10. Workbench;

[0057] 20. Three-roller sizing mechanism;

[0058] 201, roller;

[0059] 30. Visual monitoring box;

[0060] 301, closed box;

[0061] H301, through hole;

[0062] 302, light source;

[0063] 303, visual camera;

[0064] 40. Material guide rack;

[0065] 50. Sizing inner core;

[0066] 501. Sizing column;

[0067] 60. Adjustable bracket;

[0068] 601, base frame;

[0069] 602, sliding seat;

[0070] 603, adjustable bolt;

[0071] 70. Seamless steel pipe.

[0072] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0073] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0074] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0075] Furthermore, 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 number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0076] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0077] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0078] The following describes in detail an intelligent sizing device for processing seamless steel pipes 70 according to an embodiment of the present invention with reference to the accompanying drawings.

[0079] Reference Figures 1 to 6 As shown, the intelligent sizing equipment for processing seamless steel pipes 70 provided in an embodiment of the present invention includes a workbench 10, at least two sets of three-roller sizing mechanisms 20, a driving device, a visual monitoring box 30, a material guide rack 40 and a control device.

[0080] Specifically, at least two sets of three-roller sizing mechanisms 20 are spaced apart along the conveying direction on the workbench 10 to perform sizing on the seamless steel pipe 70. Each set of three-roller sizing mechanisms 20 comprises three evenly spaced rollers 201. These rollers 201 together form a sizing hole through which the seamless steel pipe 70 passes. The rollers 201 then apply radial pressure to the seamless steel pipe 70 to perform sizing on the seamless steel pipe 70.

[0081] A drive device is connected to the three-roller sizing mechanism 20 and is used to drive the rollers 201 of the three-roller sizing mechanism 20 to rotate. Specifically, the drive device drives the rollers 201 in the three-roller sizing mechanism 20 to rotate. There may be at least two drive devices, each corresponding to at least two three-roller sizing mechanisms 20, enabling independent drive of each three-roller sizing mechanism 20. This independent drive configuration facilitates achieving different speeds for each group of three-roller sizing mechanisms 20, thereby creating a speed differential. This speed differential applies axial tension to the seamless steel tube 70. The dual effects of axial tension and radial pressure achieve more efficient and accurate sizing.

[0082] The visual monitoring box 30 is arranged on the workbench 10 and is located behind at least two groups of the three-roller sizing mechanisms 20 in the conveying direction. In this way, it is ensured that the seamless steel pipe 70 passes through the visual monitoring box 30 along the conveying direction and then passes through the three-roller sizing mechanism 20. The visual monitoring box 30 can first sample the seamless steel pipe 70 and obtain an image of the seamless steel pipe 70. After sampling, it enters the three-roller sizing mechanism 20. The control device controls the three-roller sizing mechanism 20 according to the image analysis results, thereby realizing real-time sizing processing under visual monitoring.

[0083] The visual monitoring box 30 includes a closed box 301, a light source 302, and a visual camera 303. The closed box 301 has through-holes H301 on opposite sides thereof, through which the seamless steel pipe 70 passes. The light source 302 is disposed within the closed box 301 to provide a stable lighting environment, ensuring the quality and consistency of image acquisition. The visual camera 303 is disposed within the closed box 301 to capture images of the seamless steel pipe 70. The visual camera 303 can continuously and in real time capture images of the seamless steel pipe 70. The design of the closed box 301 effectively prevents interference from the external environment, significantly improving the accuracy and reliability of image acquisition.

[0084] The guide rack 40 is arranged side by side with the workbench 10 in the conveying direction to guide the seamless steel pipe 70 in the conveying direction, ensuring the stability of the seamless steel pipe 70 during the conveying process, and also helping the seamless steel pipe 70 to accurately pass through each three-roller sizing mechanism 20 and the visual monitoring box 30, ensuring the smooth progress of the entire sizing and monitoring process.

[0085] The control device is connected to the three-roller sizing mechanism 20 and the visual monitoring box 30. The control device includes a diameter detection unit for analyzing the image to determine whether the outer diameter of the seamless steel tube 70 meets a predetermined value. If the outer diameter of the seamless steel tube 70 does not meet the predetermined value, the control device outputs a control instruction to the drive device to control and adjust the speed difference of the rollers 201 between each group of the three-roller sizing mechanism 20, thereby adjusting the axial tension applied to the seamless steel tube 70.

[0086] Specifically, the control unit analyzes the image of the seamless steel tube 70, measures the outer diameter of the seamless steel tube 70, and determines whether the outer diameter meets a predetermined value, which can be a numerical range. If the control unit detects that the outer diameter of the seamless steel tube 70 exceeds this numerical range, it outputs a control instruction to the drive unit. Based on this control instruction, the drive unit adjusts the speed difference between the rollers 201 of each set of three-roller sizing mechanisms 20. This change in speed difference alters the axial tension acting on the steel tube, thereby correcting the outer diameter of the seamless steel tube 70.

[0087] The intelligent sizing equipment for seamless steel pipe 70 processing provided by an embodiment of the present invention, combined with visual monitoring and an intelligent control system, significantly improves the accuracy and efficiency of sizing processing for seamless steel pipe 70. The visual monitoring box 30 adopts a closed design and is equipped with a light source 302 and a visual camera 303. This allows for comprehensive and continuous capture of steel pipe images under stable lighting conditions, overcoming the limitations of single-point detection using traditional laser measurement. The diameter detection unit in the control device analyzes the captured images in real time to accurately determine whether the outer diameter of the steel pipe meets a predetermined value. When an outer diameter deviation is detected, the system automatically generates a control instruction to change the axial tension of the steel pipe by adjusting the speed difference between the rollers 201 of the multiple sets of three-roller sizing mechanisms 20, thereby achieving precise control of the steel pipe's dimensions. This dynamic adjustment mechanism based on visual feedback not only enables more comprehensive monitoring of steel pipe dimensional changes, but also minimizes the impact on the inner diameter while ensuring outer diameter accuracy, resolving the problem of large inner diameter errors caused by adjusting only radial pressure in traditional methods.

[0088] Reference Figure 3 As shown, in one embodiment of the present invention, two visual cameras 303 are provided. One of the two visual cameras 303 is located on the top wall of the closed box 301 to capture a top-view image of the seamless steel pipe 70, and the other of the two visual cameras 303 is located on a side wall of the closed box 301 to capture a side-view image of the seamless steel pipe 70. The axes of the two visual cameras 303 are perpendicular to each other. The two visual cameras 303 capture images of the seamless steel pipe 70 from both a top-down and a side-view perspective, respectively, ensuring that image information is obtained from different angles, providing more comprehensive image data for subsequent image analysis.

[0089] The control device also includes a roundness detection unit, a straightness detection unit, and a defect detection unit. The roundness detection unit is further configured to determine the roundness of the seamless steel tube 70 based on the top and side images, thereby detecting whether the seamless steel tube 70 has defects such as ovalization. The straightness detection unit is configured to determine the straightness of the seamless steel tube 70 based on the top and side images, thereby determining whether the seamless steel tube 70 has bending or twisting. The defect detection unit is configured to determine the appearance defects of the seamless steel tube 70 based on the top and side images, thereby accurately identifying and locating various defects on the steel tube surface, such as scratches, dents, and oxidation spots, providing an important basis for subsequent quality control.

[0090] In this embodiment, the aforementioned control device further improves the accuracy and reliability of visual monitoring. Multi-angle image acquisition ensures an accurate overview of the seamless steel tube 70. The coordinated operation of various inspection units enables comprehensive inspection of multiple dimensions, including size, roundness, straightness, and surface defects, fully meeting the stringent quality requirements of seamless steel tube 70 processing. This integrated visual inspection system, combined with a dynamically controlled sizing mechanism, creates a highly intelligent and automated seamless steel tube 70 production line, significantly improving production efficiency and product consistency.

[0091] Preferably, there are four light sources 302, which are respectively arranged at the four corners of the closed box 301. This distributed arrangement not only improves the coverage of the lighting, but also effectively reduces adverse effects such as shadows and reflections, providing a good foundation for subsequent image processing and analysis.

[0092] In one embodiment of the present invention, the diameter detection unit includes a first image preprocessing module, a first contour extraction module, a first diameter measurement module and a diameter calculation module. The first image preprocessing module is used to preprocess the top view image and the side view image, such as denoising, contrast enhancement, etc., to improve image quality.

[0093] The first contour extraction module is used to extract the axial contour lines of the seamless steel tube 70 from the top and side images, respectively, to generate top and side contour images. For example, image processing algorithms such as edge detection and segmentation can be used to accurately separate the seamless steel tube 70 contour from the background, ultimately generating top and side contour images. These two contour images record the edge contours of the steel tube from different perspectives, providing a key data source for subsequent diameter measurement.

[0094] The first diameter measurement module is used to measure the top-view diameter of the seamless steel tube 70 in the top-view profile image and the side-view diameter of the seamless steel tube 70 in the side-view profile image at multiple different axial positions. This multi-point measurement method effectively reflects the diameter variation of the seamless steel tube 70 at different axial positions, overcoming the limitations of traditional single-point measurement. During the measurement process, the diameter value at each axial position (i.e., measurement point) can be accurately obtained through methods such as geometric calculation or fitting.

[0095] The diameter calculation module calculates the average diameter at each axial position and the overall average diameter. The average diameter at each axial position is calculated as (the top-view diameter at that position + the side-view diameter at that position) / 2, and the overall average diameter is calculated as the average diameter of all axial positions / the number of axial positions. In other words, for each axial position, the diameter calculation module takes the average of the top-view and side-view diameters as the average diameter at that position. The overall average diameter is the arithmetic average of the average diameters at all axial positions, representing the average diameter of the entire pipe section. This average diameter serves as the basis for determining whether the specified value is met and for sizing control.

[0096] The diameter detection unit of this embodiment achieves efficient and accurate outer diameter measurement, comprehensively reflecting the overall and local diameter distribution of the seamless steel pipe 70, providing reliable data support for dimensional quality control. Furthermore, the dual-view measurement method based on top-view and side-view images further improves measurement accuracy and robustness.

[0097] In one embodiment of the present invention, the roundness detection unit includes a second image preprocessing module, a second contour extraction module, a second diameter measurement module and a roundness estimation module. The second image preprocessing module is used to preprocess the top view image and the side view image to improve image quality and contrast.

[0098] The second contour extraction module is used to extract the axial contour lines of the seamless steel tube 70 from the top view image and the side view image, respectively, to generate a top view contour image and a side view contour image. These two contour images record the edge information of the seamless steel tube 70 at different viewing angles, providing basic data for subsequent diameter measurement.

[0099] The second diameter measurement module is used to measure the top diameter of the seamless steel pipe 70 in the top profile image and the side diameter of the seamless steel pipe 70 in the side profile image at multiple different axial positions. In other words, a multi-point measurement method is used to fully reflect the diameter changes of the seamless steel pipe 70 at different positions.

[0100] The roundness estimation module is used to compare the top view diameter and side view diameter of the seamless steel tube 70 at the same axial position, obtain the diameter difference at each axial position, find the maximum diameter difference from each diameter difference, and calculate the roundness estimation value, which is the maximum diameter difference / 2.

[0101] Ideally, the top-view diameter and the side-view diameter should be exactly the same. Therefore, the presence of this diameter difference reflects the degree of roundness deviation of the seamless steel tube 70. The roundness estimation module finds the maximum diameter difference among all axial positions and uses half of this value as the estimated roundness value. This estimation method provides a relatively simple way to quantify the roundness level of the seamless steel tube 70.

[0102] The roundness detection unit described above enables efficient roundness testing and assessment of seamless steel pipes. Working in conjunction with the diameter detection unit, it not only captures the outer diameter of seamless steel pipes, but also comprehensively assesses their cross-sectional shape, providing critical data support for subsequent quality control.

[0103] In one embodiment of the present invention, the straightness detection unit includes a third image preprocessing module, an axis extraction module, a fitting module, a deviation calculation module and a straightness calculation module. The third image preprocessing module is used to preprocess the top view image and the side view image to improve image quality and contrast.

[0104] The axis extraction module is used to extract the central axis of the seamless steel pipe 70 from the top view image and the side view image respectively. An image processing algorithm can be used to analyze the edge information and symmetry of the seamless steel pipe 70 to accurately determine the position and direction of the central axis.

[0105] The fitting module is used to perform least squares fitting on the central axes of the top and side views, respectively, to obtain the top and side view fitted axes. These two fitted axes represent the ideal straight line orientation of the seamless steel tube 70 and serve as the baseline for straightness assessment. This fitting operation effectively eliminates noise and subtle fluctuations on the central axis, improving the accuracy of subsequent deviation calculations.

[0106] The deviation calculation module is used to calculate the top-view deviation (perpendicular distance) from each point on the central axis of the top view image to the corresponding point on the top view fitting axis, as well as the side-view deviation (perpendicular distance) from each point on the central axis of the side view image to the corresponding point on the side view fitting axis. These deviations reflect the degree of deviation of the seamless steel pipe 70 from the ideal straight line at different positions and viewing angles. The deviation calculation module performs point-by-point calculations to comprehensively assess the straightness of the seamless steel pipe 70 along its entire length.

[0107] The straightness calculation module is used to find the maximum top-view deviation and the maximum side-view deviation, and then calculate the straightness value: straightness value = max(top-view maximum deviation, side-view maximum deviation). In other words, the straightness calculation module finds the maximum of all top-view deviations (i.e., top-view maximum deviation) and the maximum of all side-view deviations (i.e., side-view maximum deviation), and takes the larger of these two maximum deviations as the calculated straightness value. This straightness value can more accurately reflect the maximum straightness of the seamless steel pipe 70.

[0108] Straightness is a key indicator of the processing quality of seamless steel pipes 70, reflecting the presence of defects such as bending or twisting. The straightness detection unit described above extracts the central axis of the steel pipe based on top and side views, analyzes its deviation from the ideal straight line, and quantifies the straightness deviation. This enables efficient detection and assessment of the straightness of seamless steel pipes 70. Working in conjunction with the diameter detection unit and the roundness detection unit, the present invention comprehensively controls the size, shape, and overall geometric accuracy of seamless steel pipes 70, ensuring improved quality control of seamless steel pipe 70 processing.

[0109] Reference Figure 1 and Figures 7 to 10 As shown, in some embodiments of the present invention, the intelligent sizing equipment also includes a sizing inner core 50, which is arranged on the end of the guide frame 40 away from the workbench 10, and the sizing inner core 50 extends in the opposite direction of the conveying direction and extends into the seamless steel pipe 70, and the sizing inner core 50 is used to provide radial support for the closing of the seamless steel pipe 70.

[0110] A sizing core 50 extends into one end of the seamless steel tube 70 and is provided with a sizing post 501. The outer diameter of the sizing post 501 is configured to be the inner diameter of the seamless steel tube 70 after forming, and the sizing post 501 is located at the center of the three-roller sizing mechanism 20. The sizing core 50 can reduce the effect of radial pressure on the inner diameter of the seamless steel tube 70 to a certain extent.

[0111] When the seamless steel pipe 70 passes through the three-roller sizing mechanism 20 during the conveying process, the sizing column 501 will be located at the inner center position of the seamless steel pipe 70, providing support for the inner wall of the seamless steel pipe 70. The support structure design of the sizing inner core 50 can reduce the influence of radial pressure on the inner diameter of the seamless steel pipe 70 to a certain extent. In the traditional sizing process, although the radial pressure applied by the three rollers 201 can effectively control the outer diameter of the steel pipe, it may also cause uneven deformation of the inner diameter of the steel pipe. With the cooperation of the sizing inner core 50, the internal sizing column 501 can play a role of limiting support, so that the inner diameter of the seamless steel pipe 70 can still maintain the designed size when subjected to radial compression, thus avoiding excessive deformation.

[0112] Thus, the introduction of the sizing core 50 not only improves the control accuracy of the inner diameter of the seamless steel tube 70, but also provides support and positioning for the inner wall of the seamless steel tube 70, making the seamless steel tube 70 more stable and orderly when passing through the three-roller sizing mechanism 20. In addition, this support helps maintain the overall roundness and straightness of the seamless steel tube 70 during the sizing process, thereby improving the overall processing quality of the seamless steel tube 70.

[0113] In one embodiment of the present invention, one end of the sizing inner core 50 has a ball head, and one end of the sizing column 501 is universally rotatably matched with the ball head. This rotational matching method can adapt to the assembly size error between the sizing inner core 50 and the seamless steel pipe 70.

[0114] During the actual processing, due to manufacturing tolerances and installation errors, a certain dimensional deviation is inevitable between the sizing inner core 50 and the inner wall of the seamless steel pipe 70. If a rigid connection is used, it may result in the inner core and the steel pipe not being accurately aligned, thereby affecting the sizing effect. The ball head structure design of the present invention gives the sizing column 501 a certain degree of rotational freedom, allowing it to automatically adjust its orientation and achieve precise alignment with the inner wall of the seamless steel pipe 70. In this way, it can not only effectively absorb assembly dimensional errors, but also adapt to the slight displacement and angular changes of the seamless steel pipe 70 during the transmission process. When the steel pipe is slightly offset or tilted during movement, the sizing column 501 can also flexibly perform angle compensation to ensure that it maintains a good concentric state with the inner wall of the seamless steel pipe 70. This adaptive ability greatly improves the working reliability and stability of the sizing inner core 50.

[0115] Reference Figures 1 to 2 and Figure 4 As shown, in some embodiments of the present invention, there are two visual monitoring boxes 30 , and the two visual monitoring boxes 30 are respectively located in front of and behind the three-roller sizing mechanism 20 in the conveying direction.

[0116] A limit switch is provided on the end of the guide rack 40 away from the workbench 10. When the limit switch detects the seamless steel pipe 70, the control device controls the drive device to drive the roller 201 to rotate in the opposite direction, so that the seamless steel pipe 70 is transported in the opposite direction, and the secondary sizing of the seamless steel pipe 70 is completed under the visual monitoring of the other one of the two visual monitoring boxes 30.

[0117] After the seamless steel pipe 70 passes the first sizing, it continues to be transported along the guide rack 40 and will eventually trigger the limit switch. Once the limit switch detects the arrival of the seamless steel pipe 70, it will send a signal to the control device, which will then control the drive device to drive the rollers 201 to rotate in the opposite direction, causing the steel pipe to be transported in the opposite direction. During the reverse transmission process, the seamless steel pipe 70 will pass through the three-roller sizing mechanism 20 again. At this time, another visual monitoring box 30 will perform image acquisition. Based on the image data obtained in the second acquisition, the control device will re-evaluate the deviation of the steel pipe and adjust the three-roller sizing mechanism 20 as needed to further optimize the outer diameter, roundness, and straightness of the seamless steel pipe 70. Through this dual-perspective, dual-sizing method, not only can the coverage and accuracy of size detection be greatly improved, but it can also effectively compensate for the deviation that may exist in the first sizing, further improving the accuracy and reliability of the entire sizing process.

[0118] Reference Figure 1 、 Figure 9 and Figure 10 As shown, in one embodiment of the present invention, an adjustable bracket 60 is provided on the end of the guide frame 40 away from the workbench 10. The adjustable bracket 60 includes a base frame 601, a sliding seat 602 and an adjustable bolt 603. The base frame 601 is fixed to the guide frame 40, and the sliding seat 602 can slide in the up and down directions on the base frame 601. The adjustable bolt 603 is provided on the base frame 601 and is located below the sliding seat 602 and abuts against the sliding seat 602 to adjust the height of the sliding seat 602. One end of the sizing inner core 50 is fixed to the sliding seat 602.

[0119] In order to improve the versatility and adaptability of the intelligent sizing device of the present invention, in this embodiment, an adjustable bracket 60 is provided on the end of the guide frame 40 away from the workbench 10. This design enables the intelligent sizing device to adapt to seamless steel pipes 70 of different diameters, thereby expanding its versatility in seamless steel pipes 70.

[0120] The sliding seat 602 slides in conjunction with the base frame 601, enabling vertical adjustment. This sliding design allows the height of the bracket to be varied within a certain range. Rotating the adjustable bolt 603 causes the sliding seat 602 to move up and down, thereby changing the height of the calibrated inner core 50. Because the adjustable bolt 603 rotates in precise increments, this adjustment method ensures smooth and accurate height changes.

[0121] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0122] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An intelligent sizing device for seamless steel pipe processing, characterized in that: include: Workbench; At least two sets of three-roller sizing mechanisms, at least two sets of the three-roller sizing mechanisms are arranged on the workbench at intervals along the conveying direction, for sizing the seamless steel pipe; a driving device connected to the three-roller sizing mechanism and configured to drive the rollers of the three-roller sizing mechanism to rotate; A visual monitoring box, the visual monitoring box being arranged on the workbench and being located behind at least two groups of the three-roller sizing mechanisms in the conveying direction; A material guide rack, arranged side by side with the workbench in the conveying direction, for guiding the seamless steel pipe in the conveying direction; A control device connected to the three-roller sizing mechanism and the visual monitoring box; The visual monitoring box includes a closed box, a light source and a visual camera. The two opposite walls of the closed box are provided with through holes for the seamless steel pipe to pass through. The light source is arranged in the closed box to provide a lighting environment. The visual camera is arranged in the closed box to collect images of the seamless steel pipe. The control device includes a diameter detection unit for analyzing the image to determine whether the outer diameter of the seamless steel pipe meets a predetermined value. When the outer diameter of the seamless steel pipe does not meet the predetermined value, the control device outputs a control instruction to the drive device to control the speed difference between the rollers of each group of the three-roller sizing mechanism through the drive device, thereby adjusting the axial tension on the seamless steel pipe. There are two visual cameras, one of which is located on the top wall of the closed box to capture a top view image of the seamless steel pipe, and the other of which is located on a side wall of the closed box to capture a side view image of the seamless steel pipe, and the axes of the two visual cameras are perpendicular to each other; The control device further includes a roundness detection unit, which is further used to determine the roundness of the seamless steel pipe based on the top view image and the side view image; The control device further includes a straightness detection unit and a defect detection unit, wherein the straightness detection unit is used to determine the straightness of the seamless steel pipe according to the top view image and the side view image; and the defect detection unit is used to determine the appearance defects of the seamless steel pipe according to the top view image and the side view image. There are two visual monitoring boxes, which are respectively located in front of and behind the three-roller sizing mechanism in the conveying direction; A limit switch is provided on the end of the guide rack away from the workbench. When the limit switch detects the seamless steel pipe, the control device controls the drive device to drive the roller to rotate in the opposite direction, so that the seamless steel pipe is transported in the opposite direction, and the secondary sizing of the seamless steel pipe is completed under the visual monitoring of the other one of the two visual monitoring boxes.

2. The intelligent sizing equipment for seamless steel pipe processing according to claim 1 is characterized in that: The diameter detection unit comprises: A first image preprocessing module, configured to preprocess the top view image and the side view image; A first contour extraction module is used to extract the axial contour line of the seamless steel pipe from the top view image and the side view image, respectively, to obtain a top view contour image and a side view contour image; a first diameter measuring module, configured to measure the top view diameter of the seamless steel pipe in the top view profile image and the side view diameter of the seamless steel pipe in the side view profile image at a plurality of different axial positions; The diameter calculation module is used to calculate the average diameter of each axial position and the overall average diameter, where the average diameter of each axial position = (the top view diameter of the axial position + the side view diameter of the axial position) / 2, and the overall average diameter = the average diameter of all axial positions / the number of axial positions.

3. The intelligent sizing equipment for seamless steel pipe processing according to claim 1, characterized in that: The roundness detection unit comprises: A second image preprocessing module, configured to preprocess the top view image and the side view image; A second contour extraction module is used to extract the axial contour line of the seamless steel pipe from the top view image and the side view image, respectively, to obtain a top view contour image and a side view contour image; A second diameter measuring module is used to measure the top view diameter of the seamless steel pipe in the top view profile image and the side view diameter of the seamless steel pipe in the side view profile image at multiple different axial positions; The roundness estimation module is used to compare the top view diameter and the side view diameter of the seamless steel pipe at the same axial position, obtain the diameter difference at each axial position, find the maximum diameter difference from each diameter difference, and calculate the roundness estimation value, wherein the roundness estimation value = the maximum diameter difference / 2.

4. The intelligent sizing equipment for seamless steel pipe processing according to claim 1, characterized in that: The straightness detection unit includes: A third image preprocessing module, configured to preprocess the top view image and the side view image; an axis extraction module, for extracting the central axis of the seamless steel pipe from the top view image and the side view image respectively; A fitting module, configured to perform least squares fitting on the central axes of the top view image and the side view image, respectively, to obtain a top view fitting axis and a side view fitting axis; a deviation calculation module, configured to calculate a top-view deviation value from each point on the central axis of the top view image to a corresponding point on the top view fitting axis, and to calculate a side-view deviation value from each point on the central axis of the side view image to a corresponding point on the side view fitting axis; The straightness calculation module is used to find the maximum top view deviation value and the maximum side view deviation value, and calculate the straightness value, where the straightness value = max (maximum top view deviation value, maximum side view deviation value).

5. The intelligent sizing equipment for seamless steel pipe processing according to claim 1, characterized in that: The intelligent sizing device further includes a sizing inner core, which is arranged on one end of the guide frame away from the workbench, and the sizing inner core extends in the opposite direction of the conveying direction and extends into the seamless steel pipe; The sizing inner core extends into one end of the seamless steel pipe and is provided with a sizing column. The outer diameter of the sizing column is configured to be the inner diameter of the seamless steel pipe after forming, and the sizing column is located at the center of the three-roller sizing mechanism.

6. The intelligent sizing equipment for seamless steel pipe processing according to claim 5, characterized in that: One end of the sizing inner core is provided with a ball head, and one end of the sizing column is universally rotatably matched with the ball head.

7. The intelligent sizing equipment for seamless steel pipe processing according to claim 5, characterized in that: An adjustable bracket is provided on one end of the material guide rack away from the workbench; The adjustable bracket includes a base frame, a sliding seat and an adjustable bolt. The base frame is fixed on the material guide frame. The sliding seat can slide in the up and down directions on the base frame. The adjustable bolt is arranged on the base frame and is located below the sliding seat and is against the sliding seat to adjust the height of the sliding seat. One end of the sizing inner core is fixed on the sliding seat.

8. The intelligent sizing equipment for seamless steel pipe processing according to claim 1, characterized in that: There are four light sources, and the four light sources are respectively arranged at the four corners of the closed box.

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