Intelligent sizing equipment for seamless steel pipe machining

Abstract

The intelligent sizing equipment comprises a workbench, at least two sets of three-roller sizing mechanisms, a driving device, a visual monitoring box and a control device, the at least two sets of three-roller sizing mechanisms are arranged on the workbench at intervals, and the driving device is connected with the three-roller sizing mechanisms; the visual monitoring box is arranged on the workbench and used for collecting images of the seamless steel pipes. The control device is connected with the three-roller sizing mechanism and the visual monitoring box, comprises a diameter detection unit and is used for analyzing the image to judge whether the outer diameter of the seamless steel pipe meets a preset value or not and outputting a control instruction to the driving device when the outer diameter of the seamless steel pipe does not meet the preset value; and the speed difference of the rollers among the groups of three-roller sizing mechanisms is controlled and adjusted through the driving device, so that the axial tension on the seamless steel pipe is adjusted. Visual monitoring and an intelligent control system are combined, and the precision and efficiency of seamless steel pipe sizing machining are remarkably improved.

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 steel pipe without welds, which is mainly manufactured by hot rolling, cold rolling or cold drawing. Seamless steel pipe is widely used in oil, natural gas, boilers, ships, machinery manufacturing, automobiles, aerospace and other fields, and is widely favored for its high strength, high pressure resistance, corrosion resistance and good mechanical properties.

[0003] In the manufacturing process of seamless steel pipes, sizing is a key link. The purpose of sizing is to ensure that the outer diameter of the steel pipe meets the design requirements and meets the accuracy and strength requirements in use. The quality of the sizing process directly affects the dimensional accuracy and surface quality of the steel pipe. Therefore, how to efficiently and accurately perform sizing is an important technical problem in the manufacturing of seamless steel pipes.

[0004] In the related art, the three-roller sizing mechanism is a commonly used sizing equipment for seamless steel pipes, which is composed of three evenly distributed rollers. The sizing holes are defined between the wheel surfaces of the three rollers. In order to achieve accurate 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 when the radial pressure changes the outer diameter, it is also easy to affect its inner diameter, resulting in a large error 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 object, an intelligent sizing device for seamless steel pipe processing according to an embodiment of the present invention includes: Workbench; At least two groups of three-roller sizing mechanisms, at least two groups 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, the driving device is connected to the three-roller sizing mechanism and is used to drive the rollers of the three-roller sizing mechanism to rotate; A visual monitoring box, which is disposed on the workbench and is located behind at least two groups of the three-roller sizing mechanisms in the conveying direction; A material guide rack, which is arranged side by side with the workbench in the conveying direction and is used to guide the seamless steel pipe in the conveying direction; A control device, the control device being 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 side 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, 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.

[0007] In addition, the intelligent sizing device for seamless steel pipe processing according to the above embodiment of the present invention may also have the following additional technical features: According to one embodiment of the present invention, there are two visual cameras, one of which is arranged on the top wall of the closed box to collect the top view image of the seamless steel pipe, and the other of which is arranged on a side wall of the closed box to collect the side view image of the seamless steel pipe, and the axes of the two visual cameras are perpendicular to each other; The control device also includes a roundness detection unit, a straightness detection unit and a defect detection unit. The roundness detection unit is also 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; 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.

[0008] According to one embodiment of the present invention, the diameter detection unit comprises: A first image preprocessing module, used for preprocessing 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 measurement 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 diameter calculation module is used to calculate the average diameter of each axial position and the overall average diameter, wherein 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.

[0009] According to one embodiment of the present invention, the roundness detection unit includes: A second image preprocessing module, used for preprocessing 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 measurement 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 = maximum diameter difference / 2.

[0010] According to one embodiment of the present invention, the straightness detection unit comprises: A third image preprocessing module, used for preprocessing the top view image and the side view image; An axis extraction module, used to extract the central axis of the seamless steel pipe from the top view image and the side view image respectively; A fitting module, used for performing 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, used to calculate the top view deviation value from each point on the central axis of the top view image to the corresponding point on the top view fitting axis, and to calculate the side view deviation value from each point on the central axis of the side view image to the 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, wherein the straightness value = max (maximum top view deviation value, maximum side view deviation value).

[0011] According to one embodiment of the present invention, the intelligent sizing device further comprises a sizing inner core, which is arranged on one end of the material 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 as 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.

[0012] 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.

[0013] 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; 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 transmitted 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.

[0014] According to one embodiment of the present invention, an adjustable bracket is provided on the end of the material guide frame 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 on the base frame in the up and down directions. 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.

[0015] 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.

[0016] 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 system, 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 collect steel pipe images under a stable lighting environment, overcoming the limitations of single-point detection of traditional laser measurement. 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 the 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 of the rollers between multiple groups of three-roller sizing mechanisms, thereby achieving precise control of the size of the steel pipe. This dynamic adjustment mechanism based on visual feedback can not only monitor the size 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.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0019] Figure 1 It is a structural schematic diagram of an intelligent sizing device for seamless steel pipe processing according to an embodiment of the present invention; Figure 2 It is a structural schematic diagram showing a partial structure from one perspective of an intelligent sizing device for seamless steel pipe processing according to an embodiment of the present invention; Figure 3 It is a structural schematic diagram of a visual monitoring box in an intelligent sizing device for seamless steel pipe processing according to an embodiment of the present invention; Figure 4 It is a structural schematic diagram of a part of the structure of the intelligent sizing device 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; Figure 5 It 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; Figure 6 It is a structural schematic diagram from another 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; Figure 7 It is a structural schematic 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; Figure 8 It is an end-to-end schematic diagram of the coordination between the sizing inner core, the roller and the seamless steel pipe in the intelligent sizing equipment for seamless steel pipe processing according to an embodiment of the present invention; Fig. 9 It is a lateral schematic diagram of the coordination between the sizing inner core, the roller and the seamless steel pipe in the intelligent sizing equipment for seamless steel pipe processing according to an embodiment of the present invention; Fig.10 It is a structural schematic diagram of a sizing inner core in an intelligent sizing device for seamless steel pipe processing according to an embodiment of the present invention.

[0020] Reference numerals: 10. Workbench; 20. Three-roller sizing mechanism; 201, roller; 30. Visual monitoring box; 301, closed box; H301, through hole; 302. Light source; 303, visual camera; 40. Material guide rack; 50. Sizing inner core; 501. Sizing column; 60. Adjustable bracket; 601, base frame; 602, sliding seat; 603, adjustable bolt; 70. Seamless steel pipe.

[0021] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments 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, but are not to be construed as limiting the present invention. All other embodiments obtained by ordinary technicians in the field without creative work based on the embodiments of the present invention are within the scope of protection of the present invention.

[0023] In the description of the present invention, it is to 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 orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0027] The following describes in detail an intelligent sizing device for processing a seamless steel pipe 70 according to an embodiment of the present invention with reference to the accompanying drawings.

[0028] Reference Figures 1 to 6 As shown, the intelligent sizing equipment for processing seamless steel pipe 70 provided according to 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 frame 40 and a control device.

[0029] Specifically, at least two groups of the three-roller sizing mechanisms 20 are arranged on the workbench 10 at intervals along the conveying direction to perform sizing on the seamless steel pipe 70. Each group of the three-roller sizing mechanisms 20 is composed of three evenly distributed rollers 201, which together form a sizing hole, through which the seamless steel pipe 70 passes, and the rollers 201 apply radial pressure to the seamless steel pipe 70 to perform sizing on the seamless steel pipe 70.

[0030] The driving device is connected to the three-roller sizing mechanism 20, and is used to drive the roller 201 of the three-roller sizing mechanism 20 to rotate. That is, the driving device drives the roller 201 in the three-roller sizing mechanism 20 to rotate. There can be at least two driving devices, and at least two driving devices correspond to at least two three-roller sizing mechanisms 20 one by one, so as to realize the independent driving of each three-roller sizing mechanism 20. This independent driving mode facilitates the realization of different speeds of each group of three-roller sizing mechanisms 20, thereby forming a speed difference. When the speed difference exists, axial tension can be applied to the seamless steel pipe 70, and the dual effects of axial tension and radial pressure can achieve a more efficient and more accurate sizing effect.

[0031] 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 to obtain an image of the seamless steel pipe 70, and then enter the three-roller sizing mechanism 20 after sampling. The control device controls the three-roller sizing mechanism 20 according to the image analysis result, thereby realizing real-time sizing processing under visual monitoring.

[0032] The visual monitoring box 30 includes a closed box 301, a light source 302 and a visual camera 303. The two opposite side walls of the closed box 301 are provided with through holes H301 for the seamless steel pipe 70 to pass through. The light source 302 is arranged in the closed box 301 to provide a stable lighting environment to ensure the quality and consistency of image acquisition. The visual camera 303 is arranged in the closed box 301 to collect images of the seamless steel pipe 70. The image of the seamless steel pipe 70 can be continuously collected in real time by the visual camera 303. The design of the closed box 301 effectively avoids interference from the external environment and greatly improves the accuracy and reliability of image acquisition.

[0033] The material 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, thereby 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, thereby ensuring the smooth progress of the entire sizing and monitoring process.

[0034] 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, which is used to analyze the image to determine whether the outer diameter of the seamless steel pipe 70 meets the predetermined value. When the outer diameter of the seamless steel pipe 70 does not meet the predetermined value, a control instruction is output 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 through the drive device, thereby adjusting the axial tension on the seamless steel pipe 70.

[0035] That is, the control unit analyzes the image of the seamless steel pipe 70, and then measures the outer diameter of the seamless steel pipe 70, and determines whether the outer diameter meets a predetermined value, which can be a numerical range. When the control device detects that the outer diameter of the seamless steel pipe 70 exceeds the numerical range, the control device outputs a control instruction to the drive device. The drive device adjusts the speed difference of the rollers 201 between each group of three-roller sizing mechanisms 20 according to the control instruction. The change of this speed difference will change the axial tension acting on the steel pipe, thereby correcting the outer diameter of the seamless steel pipe 70.

[0036] According to the intelligent sizing equipment for seamless steel pipe 70 processing provided by the embodiment of the present invention, combined with visual monitoring and intelligent control system, the accuracy and efficiency of sizing processing of seamless steel pipe 70 are significantly improved. The visual monitoring box 30 adopts a closed design, equipped with a light source 302 and a visual camera 303, which can comprehensively and continuously collect steel pipe images under a stable lighting environment, overcoming the limitations of single-point detection of traditional laser measurement. 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 the 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 of the rollers 201 between multiple groups of three-roller sizing mechanisms 20, thereby achieving precise control of the size of the steel pipe. This dynamic adjustment mechanism based on visual feedback can not only monitor the size change of the steel pipe more comprehensively, but also minimize the impact on the inner diameter while ensuring the outer diameter accuracy, solving the problem of large inner diameter error caused by only adjusting the radial pressure in the traditional method.

[0037] Reference Figure 3 As shown, in one embodiment of the present invention, there are two visual cameras 303, one of the two visual cameras 303 is arranged on the top wall of the closed box 301 to collect the top view image of the seamless steel pipe 70, and the other of the two visual cameras 303 is arranged on a side wall of the closed box 301 to collect the side view image of the seamless steel pipe 70, and the axes of the two visual cameras 303 are perpendicular to each other. The two visual cameras 303 collect the images of the seamless steel pipe 70 from the top view and the side view respectively, ensuring the image information obtained from different angles, and providing more comprehensive image data for subsequent image analysis.

[0038] The control device also includes a roundness detection unit, a straightness detection unit and a defect detection unit. The roundness detection unit is also used to determine the roundness of the seamless steel pipe 70 according to the top view image and the side view image, and then detect whether the seamless steel pipe 70 has defects such as ovalization. The straightness detection unit is used to determine the straightness of the seamless steel pipe 70 according to the top view image and the side view image, so as to determine whether the seamless steel pipe 70 has bending or twisting. The defect detection unit is used to determine the appearance defects of the seamless steel pipe 70 according to the top view image and the side view image, and then accurately identify and locate various defects on the surface of the steel pipe, such as scratches, dents, oxidation spots, etc., providing an important basis for subsequent quality control.

[0039] In this embodiment, the accuracy and reliability of visual monitoring are further improved through the above-mentioned control device. Multi-angle image acquisition ensures accurate grasp of the overall picture of the seamless steel pipe 70. The coordinated work of various detection units realizes multi-dimensional comprehensive detection of size, roundness, straightness and surface defects, and fully meets the strict requirements of seamless steel pipe 70 processing on product quality. This integrated visual inspection system, combined with a dynamically controlled sizing mechanism, can form a highly intelligent and automated seamless steel pipe 70 production line, which greatly improves production efficiency and product consistency.

[0040] Preferably, there are four light sources 302, which are respectively arranged at four corners of the closed box 301. This distributed arrangement not only improves the coverage of lighting, but also effectively reduces adverse effects such as shadows and reflections, providing a good basis for subsequent image processing and analysis.

[0041] 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.

[0042] The first contour extraction module is used to extract the axial contour line of the seamless steel pipe 70 from the top view image and the side view image, respectively, to obtain a top view contour map and a side view contour map, respectively. For example, the contour of the seamless steel pipe 70 and the background can be accurately separated by edge detection, segmentation and other image processing algorithms, and finally a top view contour map and a side view contour map are generated. These two contour maps record the edge contours of the steel pipe at different viewing angles, providing a key data source for subsequent diameter measurement.

[0043] The first diameter measurement module is used to measure the top view diameter of the seamless steel pipe 70 on the top view profile and the side view diameter of the seamless steel pipe 70 on the side view profile at multiple different axial positions. This multi-point measurement method can effectively reflect the diameter change of the seamless steel pipe 70 at different axial positions, overcoming the limitations of traditional single-point measurement. During the measurement process, the diameter value of each axial position (i.e., measurement point) can be accurately obtained through methods such as geometric calculation or fitting.

[0044] 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. That is, for each axial position, the diameter calculation module will take the average of the top view diameter and the side view diameter of the position as the average diameter of the position. The overall average diameter is the arithmetic average of the average diameters of all axial positions, and the value obtained represents the average diameter of the entire steel pipe section. The average diameter will be used as the basis for judging whether the predetermined value is met and for sizing control.

[0045] The diameter detection unit of the present embodiment can achieve efficient and accurate outer diameter measurement, which can fully reflect the overall and local diameter distribution of the seamless steel pipe 70, and provide reliable data support for dimensional quality control. At the same time, the dual-viewing angle measurement method based on the top view image and the side view image further improves the accuracy and robustness of the measurement.

[0046] 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.

[0047] The second contour extraction module is used to extract the axial contour line of the seamless steel pipe 70 from the top view image and the side view image, respectively, to obtain a top view contour map and a side view contour map, respectively. The two contour maps record the edge information of the seamless steel pipe 70 at different viewing angles, providing basic data for subsequent diameter measurement.

[0048] The second diameter measurement module is used to measure the top view diameter of the seamless steel pipe 70 in the top view profile and the side view diameter of the seamless steel pipe 70 in the side view profile at multiple different axial positions. That is, a multi-point measurement method is adopted to fully reflect the diameter changes of the seamless steel pipe 70 at different positions.

[0049] The roundness estimation module is used to compare the top view diameter and the side view diameter of the seamless steel pipe 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, wherein the roundness estimation value = maximum diameter difference / 2.

[0050] Since the top view diameter and the side view diameter should be completely equal in an ideal state, the existence of this diameter difference reflects the degree of roundness deviation of the seamless steel pipe 70. The roundness estimation module finds the maximum diameter difference value among all axial positions and uses half of this value as the roundness estimation value. This estimation method can quantify the roundness level of the seamless steel pipe 70 in a relatively simple manner.

[0051] The roundness detection unit can efficiently detect and evaluate the roundness of seamless steel pipe 70. Working in conjunction with the diameter detection unit, it can not only obtain the outer diameter data of seamless steel pipe 70, but also comprehensively evaluate its cross-sectional shape, providing key data support for subsequent quality control.

[0052] 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.

[0053] 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. The image processing algorithm can be used to accurately determine the position and direction of the central axis by analyzing the edge information and symmetry of the seamless steel pipe 70.

[0054] The fitting module is used to perform least squares fitting on the central axis of the top view image and the side view image, respectively, to obtain the top view fitting axis and the side view fitting axis. These two fitting axes represent the straight line direction that the seamless steel pipe 70 should present in an ideal state, and they will serve as the reference line for straightness evaluation. Through the fitting operation, the noise and slight fluctuations on the central axis can be effectively eliminated, and the accuracy of subsequent deviation calculation can be improved.

[0055] The deviation calculation module is used to calculate the top view deviation value (vertical distance) from each point on the central axis of the top view image to the corresponding point on the top view fitting axis, and to calculate the side view deviation value (vertical distance) from each point on the central axis of the side view image to the corresponding point on the side view fitting axis. These deviation values ​​reflect the degree of deviation between the seamless steel pipe 70 and the ideal straight line at different positions and different viewing angles. The deviation calculation module will calculate point by point to comprehensively evaluate the straightness of the seamless steel pipe 70 over the entire length.

[0056] 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, wherein the straightness value = max (top view maximum deviation value, side view maximum deviation value). In other words, the straightness calculation module will find the maximum value of all top view deviation values ​​(i.e., top view maximum deviation value) and the maximum value of all side view deviation values ​​(i.e., side view maximum deviation value), and take the larger of the two maximum deviation values ​​as the calculation result of the straightness value. The straightness value can more accurately reflect the maximum straightness of the seamless steel pipe 70.

[0057] Straightness is one of the important indicators for measuring the processing quality of seamless steel pipe 70, which reflects whether the steel pipe has defects such as bending or twisting. Through the above-mentioned straightness detection unit, based on the top view image and the side view image, the central axis of the steel pipe is extracted, and the deviation between it and the ideal straight line is analyzed, so as to quantify the straightness deviation value, thereby realizing efficient detection and evaluation of the straightness of seamless steel pipe 70. Working in coordination with the diameter detection unit and the roundness detection unit, the present invention can comprehensively control the size, shape and overall geometric accuracy of the seamless steel pipe 70, providing a guarantee for improving the processing quality control of seamless steel pipe 70.

[0058] 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.

[0059] The sizing inner core 50 extends into one end of the seamless steel pipe 70 and is provided with a sizing column 501, the outer diameter of which is configured to be the inner diameter of the seamless steel pipe 70 after forming, and the sizing column 501 is located at the center of the three-roller sizing mechanism 20. 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.

[0060] When the seamless steel pipe 70 passes through the three-roller sizing mechanism 20 during the transmission process, the sizing column 501 will be located at the inner center of the seamless steel pipe 70 to provide 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 size 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 when the seamless steel pipe 70 is subjected to radial extrusion, the inner diameter can still maintain the designed size, avoiding excessive deformation.

[0061] Thus, the introduction of the sizing inner core 50 not only improves the control accuracy of the inner diameter of the seamless steel pipe 70, but also provides support and positioning for the inner wall of the seamless steel pipe 70, so that the seamless steel pipe 70 is more stable and orderly when passing through the three-roller sizing mechanism 20. Moreover, this support helps to maintain the overall roundness and straightness of the seamless steel pipe 70 during the sizing process, thereby improving the comprehensive processing quality of the seamless steel pipe 70.

[0062] 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.

[0063] In the actual processing, due to the existence of manufacturing tolerance and installation error, it is inevitable that a certain size deviation will occur between the sizing inner core 50 and the inner wall of the seamless steel pipe 70. If a rigid connection is adopted, it may cause the inner core and the steel pipe to be unable to accurately align, 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, so that it can automatically adjust the orientation and achieve accurate alignment with the inner wall of the seamless steel pipe 70. In this way, it can not only effectively absorb the assembly size error, but also adapt to the small displacement and angle change 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.

[0064] Reference Figure 1 to Figure 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.

[0065] A limit switch is provided on the end of the guide frame 40 away from the workbench 10. When the limit switch detects the seamless steel pipe 70, the control device controls the driving device to drive the roller 201 to rotate in the opposite direction, so that the seamless steel pipe 70 is transmitted 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.

[0066] After the seamless steel pipe 70 passes through the first sizing, it continues to be transmitted along the guide rack 40, and eventually the limit switch will be triggered. Once the limit switch detects the arrival of the seamless steel pipe 70, it will send a signal to the control device, and the control device will then start to control the drive device to drive the roller 201 to rotate in the opposite direction, so that the steel pipe is transmitted in the opposite direction. During the reverse transmission process, the seamless steel pipe 70 will pass through the three-roller sizing mechanism 20 again. And at this time, another visual monitoring box 30 performs image acquisition. Based on the image data obtained by 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-viewing angle and dual-sizing method, not only can the coverage and accuracy of size detection be greatly improved, but also the deviation that may exist in the first sizing can be effectively compensated, further improving the accuracy and reliability of the entire sizing process.

[0067] Reference Figure 1 , Fig. 9 and Fig.10 As shown, in one embodiment of the present invention, an adjustable bracket 60 is provided on one 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 on the guide frame 40. The sliding seat 602 can slide on the base frame 601 in the up and down directions. 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 on the sliding seat 602.

[0068] 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.

[0069] The sliding seat 602 can be adjusted in the vertical direction by sliding with the base frame 601. This sliding design allows the height of the bracket to be changed within a certain range. By rotating the adjustable bolt 603, the sliding seat 602 will move up and down under the action of the adjustable bolt 603, thereby changing the height of the sizing inner core 50. Since the rotation step of the adjustable bolt 603 is accurate, this adjustment method can ensure the stability and accuracy of the height change.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0071] 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 changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied 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 groups of three-roller sizing mechanisms, at least two groups 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, the driving device is connected to the three-roller sizing mechanism and is used to drive the rollers of the three-roller sizing mechanism to rotate; A visual monitoring box, which is disposed on the workbench and is located behind at least two groups of the three-roller sizing mechanisms in the conveying direction; A material guide rack, which is arranged side by side with the workbench in the conveying direction and is used to guide the seamless steel pipe in the conveying direction; A control device, the control device being 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 side 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, 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.

2. The intelligent sizing equipment for seamless steel pipe processing according to claim 1 is characterized in that: There are two visual cameras, one of which is arranged on the top wall of the closed box to collect the top view image of the seamless steel pipe, and the other of which is arranged on a side wall of the closed box to collect the side view image of the seamless steel pipe, and the axes of the two visual cameras are perpendicular to each other; The control device also includes a roundness detection unit, a straightness detection unit and a defect detection unit. The roundness detection unit is also 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; 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.

3. The intelligent sizing equipment for seamless steel pipe processing according to claim 2 is characterized in that: The diameter detection unit comprises: A first image preprocessing module, used for preprocessing 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 measurement 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 diameter calculation module is used to calculate the average diameter of each axial position and the overall average diameter, wherein 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.

4. The intelligent sizing equipment for seamless steel pipe processing according to claim 2 is characterized in that: The roundness detection unit comprises: A second image preprocessing module, used for preprocessing 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 measurement 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 = maximum diameter difference / 2.

5. The intelligent sizing equipment for seamless steel pipe processing according to claim 2 is characterized in that: The straightness detection unit comprises: A third image preprocessing module, used for preprocessing the top view image and the side view image; An axis extraction module, used to extract the central axis of the seamless steel pipe from the top view image and the side view image respectively; A fitting module, used for performing 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, used to calculate the top view deviation value from each point on the central axis of the top view image to the corresponding point on the top view fitting axis, and to calculate the side view deviation value from each point on the central axis of the side view image to the 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, wherein the straightness value = max (maximum top view deviation value, maximum side view deviation value).

6. The intelligent sizing equipment for seamless steel pipe processing according to claim 1, characterized in that: The intelligent sizing device further comprises 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 as 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.

7. The intelligent sizing equipment for seamless steel pipe processing according to claim 6 is 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.

8. The intelligent sizing equipment for seamless steel pipe processing according to claim 1, characterized in that: 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; 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 transmitted 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.

9. The intelligent sizing equipment for seamless steel pipe processing according to claim 6, characterized in that: An adjustable bracket is provided on one end of the material guide frame 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 on the base frame in the up and down directions. 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.

10. 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 four corners of the closed box.

Images