Online measurement method and device for UOE welded pipe edge bending curve deviation

Abstract

The application discloses a kind of UOE welded pipe edge bending curve deviation online measurement method and device, including process signal interface unit, in-place signal detector, horizontal moving mechanism, up and down lifting mechanism, laser profile sensor, edge bending curve deviation model calculation unit.Process signal interface unit is used to accept the specification data of current to-be-measured steel plate and standard template data;In-place signal detector is used to detect the in-place signal of to-be-measured steel plate;Horizontal moving mechanism is installed in the both sides of steel plate after edge bending and can control horizontal movement;Up and down lifting mechanism is installed on horizontal moving mechanism and can control up and down lifting movement;Laser profile sensor is installed on up and down lifting mechanism and is used to measure the profile curve data of steel plate edge bending;Edge bending curve deviation model calculation unit is used to complete signal and data acquisition, processing, profile modeling, curve deviation calculation and the work such as horizontal movement and up and down lifting control.

Description

Technical Field

[0001] This invention relates to the field of measurement technology in steel pipe production process, and in particular to an online measurement method and device for the deviation of the bend curve of UOE welded pipe. Background Technology

[0002] Large-diameter straight seam submerged arc welded pipes, as important engineering materials, are widely used in natural gas, heating, and water supply, playing a vital role in national economic development. UOE (Underforming Oxide) is one of the main forming processes for producing large-diameter straight seam submerged arc welded pipes. Using steel plates as raw materials, the process involves flaw detection, edge milling, forming, welding, and diameter expansion. Pre-bending is a key process in the UOE straight seam submerged arc welded pipe production line, achieved through a bending machine. Its purpose is to bend and deform the steel plate on both sides, ensuring that the bending shape meets or closely approximates the curvature requirements of the produced steel pipe specifications, thereby guaranteeing the geometric shape and dimensional accuracy of the weld area. Theoretically, the bend profile of UOE welded pipe should perfectly match the standard template profile. However, due to the influence of processing equipment and processes, the actual profile of the steel plate after pre-bending by the bending machine will deviate from the standard profile. The bend curve deviation refers to the maximum distance deviation between the bend profile on the upper surface of the steel plate after bending and the standard template profile. It is a crucial quality control parameter in UOE production, with strict requirements. Excessive or insufficient curve deviation will result in the steel plate's bending shape not meeting requirements, affecting subsequent steel pipe forming and the final product quality. Therefore, the detection of bend curve deviation has become a vital part of the UOE welded pipe production process.

[0003] In the prior art, patent application number CN202110323670.7 discloses a method, system, and equipment for detecting the forming quality of straight seam submerged arc welded pipes after pre-bending. This aims to solve the problem that existing methods for detecting the forming quality of straight seam submerged arc welded pipes after pre-bending lack a comparison principle based on the straight edge length and steel plate thickness. The method for detecting the forming quality of straight seam submerged arc welded pipes after pre-bending involves uniformly dividing the edge curve of the steel plate into n parts and marking points to obtain the center coordinates of the actual formed circle of the steel plate. The straight edge length of the steel plate is then obtained based on these center coordinates. The straight edge length is compared with the steel plate thickness; if the straight edge length is greater than the steel plate thickness, the forming quality of the steel plate is deemed unqualified.

[0004] like Figure 5 As shown, currently, the measurement of bending curve deviation mainly relies on manual sampling, which requires stopping the production line and then using standard templates and feeler gauges for measurement. This method is greatly affected by factors such as the production environment, the accuracy of measuring instruments, and the experience of operators. It has low measurement accuracy, slow speed, low efficiency, and high labor intensity for workers, and can no longer meet the requirements of high-efficiency production.

[0005] Therefore, it is necessary to improve such a structure to overcome the above-mentioned defects. Summary of the Invention

[0006] The purpose of this invention is to provide an online measurement method and device for the deviation of the bend curve of UOE welded pipe, which is used to complete the online measurement of the deviation of the bend curve of welded pipe and solve the problem of low efficiency of existing detection methods.

[0007] The above-mentioned technical objective of this invention has been achieved by the following technical solutions:

[0008] An online measurement method for the deviation of the bend curve of UOE welded pipe includes the following steps:

[0009] A1: Detect the steel plate arrival signal. The control unit calculates the bending curve deviation and calls the arrival signal detector to measure the arrival signal of the steel plate at the detection station. Determine whether the steel plate to be tested has entered the detection station. If the steel plate to be tested is not detected, continue to wait; if the steel plate to be tested is detected, proceed to the next step.

[0010] A2: Read the steel plate specifications to obtain the standard template, and through the process signal interface unit, read the specifications and standard template data of the steel plate to be tested as comparison data, and transmit the acquired data to the bending curve deviation calculation and control unit;

[0011] A3: Control the horizontal moving mechanism to adjust the sensor position, input the acquired steel plate width data into the bending curve deviation calculation control unit, calculate the bending position of the steel plate, and at the same time control the horizontal moving mechanism to drive the up and down lifting mechanism and the laser profile sensor to move to the bending position on both sides of the steel plate to be measured, so that the bending on both sides of the steel plate is within the horizontal measurement range of the laser profile sensor.

[0012] A4: Control the up-and-down lifting mechanism to adjust the height of the sensor, input the acquired steel plate thickness data into the bending curve deviation calculation and control unit, control the up-and-down lifting mechanism to move the laser profile sensor to the vertical above the bending position, so that the steel plate bending profile and part of the steel plate straight edge profile are within the vertical measurement range of the laser profile sensor.

[0013] A5: Collect the contour data of the curved edges on both sides. Through the laser contour sensor, collect the contour curve data of the curved edges on both sides of the upper surface of the steel plate in real time, and transmit the acquired data to the curved edge deviation calculation and control unit.

[0014] A6: Calculate the bending curve deviation. The bending curve deviation calculation and control unit processes and analyzes the input bending profile curve data, and calculates the magnitude of the bending curve deviation on both sides of the steel plate at the current position according to the bending curve deviation calculation method.

[0015] A7: Collect steel plate bend profile data multiple times, input the acquired steel plate bend profile data into the bend curve deviation calculation control unit for calculation, and output the bend curve deviation value until the entire steel plate is inspected.

[0016] A8: Calculate the bending curve deviation. After obtaining all the bending curve deviation data in the length direction of the steel plate, the bending curve deviation calculation and control unit analyzes and compares all the data and calculates the maximum value, which is the bending curve deviation of the welded pipe.

[0017] A further provision of the present invention is that the steel plate bending edge profile data includes,

[0018] The upper surface contour curves ABC on both sides of the steel plate after bending are as follows: segment AB is the bending contour curve, segment BC is the straight edge contour line, and position B is the intersection of the bending edge and the straight edge contour.

[0019] The standard template profile curve data includes A'B', which is the curved edge profile curve, and B'C', which is the straight edge profile line. Point B' is the intersection of the curved edge and the horizontal straight edge profile.

[0020] A further provision of the present invention is that the calculation of the bending curve deviation in step A8 includes the following steps:

[0021] B1: Select multiple points on the profile curve AB of the steel plate to be tested. Calculate the distance between each point and curve A'B', which is the minimum distance between the point and curve A'B'. Find the maximum distance value from the calculation results, which is the maximum distance between the profile curve AB and the template profile curve A'B'.

[0022] An online measurement device for the deviation of the bend curve of UOE welded pipe includes,

[0023] The horizontal moving mechanism is connected to the signal output terminal of the bending curve deviation calculation and control unit. The horizontal moving mechanism is used to provide the moving trajectory. The bending curve deviation calculation and control unit sends control signals to the horizontal moving mechanism to realize repeated movement in the horizontal direction.

[0024] The vertical lifting mechanism is mounted on the horizontal moving mechanism and can move synchronously with the horizontal moving mechanism. The vertical lifting mechanism is connected to the signal output terminal of the bending curve deviation calculation and control unit. The bending curve deviation calculation and control unit sends control signals to the vertical lifting mechanism to drive it to move along the length direction of the horizontal moving mechanism.

[0025] A laser profile sensor is used to measure the dimensions of the steel plate profile. The laser profile sensor is mounted on an up-and-down lifting mechanism and can move synchronously with the up-and-down lifting mechanism. The position of the laser profile sensor is adjusted by the horizontal moving mechanism in conjunction with the up-and-down lifting mechanism, so as to facilitate scanning and measuring the steel plate after bending, thereby obtaining the bending profile curve data of the steel plate. The laser profile sensor is connected to the process signal interface of the bending curve deviation calculation and control unit to transmit the acquired data to the bending curve deviation calculation and control unit.

[0026] The positioning signal detector has its detection end facing the steel plate to be tested. The positioning signal detector is connected to the process signal interface of the bending curve deviation calculation and control unit. The positioning signal detector is used to detect the steel plate to be tested after bending and send the detection data to the bending curve deviation calculation and control unit.

[0027] The bending curve deviation calculation and control unit integrates a process signal interface, which is used to realize signal transmission and interaction between the bending curve deviation calculation and control unit and the laser contour sensor and the position signal detector.

[0028] A further configuration of the present invention is that the horizontal moving mechanism includes a first horizontal moving unit and a second horizontal moving unit, the first horizontal moving unit and the second horizontal moving unit being located on both sides of the conveyor roller support wheel, respectively.

[0029] A further configuration of the present invention is as follows: the lifting mechanism includes a first lifting unit and a second lifting unit, wherein a first end of the first lifting unit is disposed on a first horizontal moving unit, and a laser contour sensor is disposed on a second end of the first lifting unit. A control command is sent to the first lifting unit by a bending curve deviation calculation control unit, and the first lifting unit drives the laser contour sensor to move along the length direction of the first horizontal moving unit to perform contour scanning of the steel plate; a first end of the second lifting unit is disposed on a second horizontal moving unit, and a laser contour sensor is disposed on a second end of the second lifting unit. A control command is sent to the second lifting unit by a bending curve deviation calculation control unit, and the second lifting unit drives the laser contour sensor to move along the length direction of the second horizontal moving unit to perform contour scanning of the steel plate.

[0030] A further feature of the present invention is that a control module is integrated on the bending curve deviation calculation and control unit. The control module is connected to the horizontal moving mechanism and the vertical lifting mechanism. The control module is used to send control commands to the horizontal moving mechanism and the vertical lifting mechanism.

[0031] In summary, the present invention has the following beneficial effects:

[0032] This invention provides a non-contact online measurement method, which uses a laser profile sensor to measure and obtain the profile data points of the steel plate edge after bending, forming a profile curve of the bending edge, and then compares and analyzes it with the profile curve of a standard template to accurately measure the deviation of the bending edge curve of the UOE welded pipe. Attached Figure Description

[0033] Figure 1 This is a flowchart of the method of the present invention.

[0034] Figure 2 This is one of the structural schematic diagrams of the online measuring device of the present invention.

[0035] Figure 3 This is the second schematic diagram of the online measuring device of the present invention.

[0036] Figure 4 This is a schematic diagram of the bending curve deviation measurement of the present invention.

[0037] Figure 5 It is a measurement diagram of the existing curved edge deviation. Detailed Implementation

[0038] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to the figures and specific embodiments.

[0039] like Figure 1 As shown, the present invention proposes an online measurement method for the deviation of the bend curve of UOE welded pipe, which includes the following steps:

[0040] A1: Detect the steel plate arrival signal. The control unit calls the arrival signal detector through the bending curve deviation calculation to measure the arrival signal of the steel plate at the detection station and determine whether the steel plate to be tested has entered the detection station. If the steel plate to be tested is not detected, continue to wait; if the steel plate to be tested is detected, proceed to the next step. Step A1 is used to determine whether the steel plate to be tested has entered the detection station, which is a prerequisite for subsequent detection steps.

[0041] A2: Read the steel plate specifications to obtain the standard template, and through the process signal interface unit, read the specifications and standard template data of the steel plate to be tested, and transmit the acquired data to the bending curve deviation calculation and control unit;

[0042] The specifications of the steel plate include the width data and the thickness data of the steel plate. Step A2 provides data preparation for the subsequent calculation of the bending curve deviation, and is used to provide data support for the subsequent deviation calculation.

[0043] A3: Control the horizontal moving mechanism to adjust the sensor position, input the acquired steel plate width data into the bending curve deviation calculation control unit, calculate the bending position of the steel plate, and at the same time control the horizontal moving mechanism to drive the up and down lifting mechanism and the laser profile sensor to move to the bending position on both sides of the steel plate to be measured, so that the bending on both sides of the steel plate is within the horizontal measurement range of the laser profile sensor.

[0044] This step can adaptively adjust according to different steel plate widths and bend positions to ensure that the laser profile sensor can accurately align with the bend position of the steel plate to be measured, thereby achieving high-precision measurement.

[0045] A4: Control the up-and-down lifting mechanism to adjust the height of the sensor, input the acquired steel plate thickness data into the bending curve deviation calculation and control unit, control the up-and-down lifting mechanism to move the laser profile sensor to the vertical above the bending position, so that the steel plate bending profile and part of the steel plate straight edge profile are within the vertical measurement range of the laser profile sensor.

[0046] A5: Collects curved edge contour data on both sides. Through a laser contour sensor, it collects curved edge contour curve data on both sides of the upper surface of the steel plate in real time and transmits the acquired data to the curved edge curve deviation calculation and control unit. By collecting curved edge contour data on both sides of the upper surface of the steel plate in real time, it provides data support for subsequent processing and improvement.

[0047] A6: Calculate the bending curve deviation. The bending curve deviation calculation and control unit processes and analyzes the input bending profile curve data, and calculates the magnitude of the bending curve deviation on both sides of the steel plate at the current position according to the bending curve deviation calculation method. Based on the calculated bending curve deviation, production personnel can adjust the production process and parameters in a timely manner to improve the bending quality of welded pipes, increase product qualification rate and production efficiency.

[0048] A7: Collect steel plate bend profile data multiple times, input the acquired steel plate bend profile data into the bend curve deviation calculation control unit for calculation, and output the bend curve deviation value until the entire steel plate is inspected.

[0049] By collecting steel plate bend profile data multiple times and continuously inspecting the entire steel plate, a comprehensive assessment of the steel plate bend quality can be ensured, reducing errors caused by a single measurement and improving the reliability and accuracy of the measurement results.

[0050] A8: Calculate the bending curve deviation. After obtaining all the bending curve deviation data in the length direction of the steel plate, the bending curve deviation calculation and control unit analyzes and compares all the data and calculates the maximum value, which is the bending curve deviation of the UOE welded pipe.

[0051] like Figure 4As shown, the steel plate bending profile data in step A7 includes the profile curves ABC of the upper surfaces on both sides of the steel plate after bending, where segment AB is the bending profile curve, segment BC is the straight edge profile line, and position B is the intersection of the bending and straight edge profiles; the obtained steel plate bending profile data is compared with the profile curve of the standard template; where A'B' is the bending profile curve, B'C' is the straight edge profile line, and point B' is the intersection of the bending and horizontal straight edge profiles.

[0052] Align the standard template contour point B' with the upper surface contour point B of the steel plate to be tested, and then align the straight edge contour line B'C' with the straight edge contour line BC of the upper surface of the steel plate to be tested. At this point, calculate the maximum distance deviation between the curved edge contour curve AB of the upper surface of the steel plate and the curved edge contour curve A'B' of the standard template; this is the curved edge curve deviation.

[0053] Step A8 involves calculating the deviation of the bend curve, which includes the following steps:

[0054] B1: Select multiple measurement points a1, a2, a3, ..., an on the contour curve AB of the steel plate to be measured. Calculate the distance between each measurement point and the curve A'B, i.e., the minimum distance value between the point and the curve A'B. Find the maximum distance value from the calculation results, which is the maximum distance between the contour curve AB and the template contour curve A'B.

[0055] During the steel plate conveying process, multiple bending curve deviation data are measured at the position of the steel plate according to the above method; after obtaining all bending curve deviation data in the length direction of the steel plate, the largest data is calculated, which is the bending curve deviation value of the UOE welded pipe. Through the above steps, the deviation value can be measured online.

[0056] The bending curve deviation calculation and control unit can accurately analyze and compare all collected bending curve deviation data to ensure that the calculated maximum deviation value is accurate. This step covers all bending curve deviation data in the length direction of the steel plate, thereby enabling a comprehensive evaluation of the bending quality of the welded pipe.

[0057] The steel plate 1 to be inspected is horizontally transported into the measurement station by the support wheels 8 of the conveyor rollers. After the arrival signal detector 5 detects that the steel plate 1 has arrived at the inspection station, the system is started. The bending curve deviation calculation and control unit 7 collects data such as the size and standard template of the steel plate to be inspected at the current measurement station through the process signal interface 6.

[0058] The bending curve deviation calculation control unit 7, based on the width of the steel plate 1 to be measured, controls the first horizontal moving unit 2-1 and the second horizontal moving unit 2-2 to move the first lifting unit 3-1 and the first lifting unit 3-2, as well as the laser profile sensor 4-1 and the laser profile sensor 4-2, to the detection positions of the left and right bending edges of the steel plate 1 to be measured. Then, based on the thickness of the steel plate 1 to be measured, it controls the first lifting unit 3-1 and the second lifting unit 3-2 to adjust the height of the laser profile sensor 4-1 and the laser profile sensor 4-2, so that the bending edge profiles on both sides are within the sensor measurement range.

[0059] The laser profile sensor 4 is activated to measure the profile curve data of the upper surfaces of both sides of the steel plate, and then sends the data to the bending curve deviation calculation and control unit 7. The bending curve deviation calculation and control unit 7 performs calculations based on the profile curve data and the profile curve data of the standard template. Taking the bending curve deviation calculation of one side as an example, 30 measurement points a1, a2, a3, ..., a30 are evenly distributed on the profile curve of the upper surface of one side of the steel plate at a spacing of l = 10 mm. The distance between each measurement point and the profile curve of the standard template is calculated, resulting in 30 distance values. Among the 30 distance values, the deviation distance value of a4 is the largest, which is 0.9 mm. This largest distance value of 0.9 mm is selected as the bending curve deviation value of the steel plate at that position.

[0060] During the conveying process, the steel plate to be tested 1 repeats the above steps to measure the bending curve deviation at different positions along the length of the steel plate until the entire steel plate is measured. The bending curve deviation calculation and control unit 7 performs statistical analysis on all the measured bending curve deviation data and obtains a maximum value of 1.2mm, which is the bending curve deviation value of the UOE welded pipe.

[0061] like Figures 2 to 3 As shown, an online measurement device for the deviation of the bend curve of UOE welded pipe includes,

[0062] The horizontal moving mechanism 2 is connected to the signal output terminal of the bending curve deviation calculation and control unit 7. The horizontal moving mechanism 2 is used to provide the moving trajectory. The bending curve deviation calculation and control unit 7 sends a control signal to the horizontal moving mechanism 2, thereby realizing repeated movement in the horizontal direction.

[0063] In use, connect the control unit: connect the signal input terminal of the horizontal moving mechanism 2 to the signal output terminal of the bending curve deviation calculation control unit 7, initialize the horizontal moving mechanism 2, and the control unit can adjust the motion state of the horizontal moving mechanism 2 in real time by sending control signals. When the steel plate enters the measurement area, the bending curve deviation calculation control unit 7 will send a control signal to the horizontal moving mechanism 2 to make it move along the predetermined trajectory.

[0064] The vertical lifting mechanism 3 is mounted on the horizontal moving mechanism 2 and can move synchronously with the horizontal moving mechanism 2. The vertical lifting mechanism 3 is connected to the signal output terminal of the bending curve deviation calculation and control unit 7. The bending curve deviation calculation and control unit 7 sends a control signal to the vertical lifting mechanism 3 to drive it to move along the length direction of the horizontal moving mechanism 2.

[0065] In use, connect the signal input terminal of the lifting mechanism 3 to the signal output terminal of the bending curve deviation calculation control unit 7 to initialize the lifting mechanism 3. The control unit can then adjust the motion state of the lifting mechanism 3 in real time by sending control signals. Based on the thickness and shape of the steel plate, the control unit sends control signals to the lifting mechanism 3 to adjust the height of the laser contour sensor 4 to the optimal measurement position. When the steel plate enters the measurement area, the bending curve deviation calculation control unit 7 will simultaneously send control signals to the horizontal movement mechanism 2 and the lifting mechanism 3, so that they work together to perform continuous measurement along the predetermined trajectory.

[0066] Laser profile sensor 4 is used to measure the dimensions of the steel plate profile. Laser profile sensor 4 is mounted on the up-and-down lifting mechanism 3 and can move synchronously with the up-and-down lifting mechanism 3. The position of laser profile sensor 4 is adjusted by the horizontal moving mechanism 2 in conjunction with the up-and-down lifting mechanism 3, so as to facilitate scanning and measuring the steel plate to be measured after bending, thereby obtaining the bending profile curve data of the steel plate. Laser profile sensor 4 is connected to the process signal interface of bending curve deviation calculation and control unit 7, and is used to transmit the acquired data to bending curve deviation calculation and control unit 7.

[0067] In use, the process signal interface of the laser profile sensor 4 is connected to the signal input terminal of the bending curve deviation calculation control unit 7. The control unit can then adjust the sensor's measurement status and data transmission in real time by sending control signals. Based on the size and shape of the steel plate, the control unit sends control signals to the horizontal moving mechanism 2 and the vertical lifting mechanism 3 to adjust the sensor's position to the optimal measurement point. The laser profile sensor 4 is then activated to scan the steel plate surface and transmits the acquired bending curve profile data to the control unit for processing and analysis in real time.

[0068] The positioning signal detector 5 has its detection end facing the steel plate to be tested. The positioning signal detector 5 is connected to the process signal interface of the bending curve deviation calculation and control unit 7. The positioning signal detector 5 is used to detect the steel plate to be tested after bending and send the detection data to the bending curve deviation calculation and control unit 7.

[0069] When using it, ensure that it is correctly connected to the bending curve deviation calculation and control unit 7, and set the detection parameters of the position signal detector 5 according to the size, shape and material characteristics of the steel plate to be tested.

[0070] The bending curve deviation calculation and control unit 7 integrates a process signal interface 6, which is used to realize signal transmission and interaction between the bending curve deviation calculation and control unit 7 and the laser contour sensor 4 and the position signal detector 5.

[0071] The conveyor roller support wheel 8 is used to provide driving force and movement trajectory. In use, the bent steel plate to be tested is placed on the conveyor roller support wheel. The steel plate to be tested is driven by the conveyor roller support wheel 8 to pass through the laser profile sensor 4 and the position signal detector 5 to complete the detection process.

[0072] The horizontal movement mechanism includes a first horizontal movement unit and a second horizontal movement unit, which are located on both sides of the conveyor roller support wheel. In use, the control unit for calculating the deviation of the curved edge curve sends control commands to the first and second horizontal movement units.

[0073] The lifting mechanism includes a first lifting unit and a second lifting unit. The first end of the first lifting unit is mounted on a first horizontal moving unit, and a laser contour sensor is mounted on the second end of the first lifting unit. A control command is sent to the first lifting unit by a bending curve deviation calculation and control unit, causing the first lifting unit to move the laser contour sensor along the length of the first horizontal moving unit to scan the contour of the steel plate. The first end of the second lifting unit is mounted on a second horizontal moving unit, and a laser contour sensor is mounted on the second end of the second lifting unit. A control command is sent to the second lifting unit by a bending curve deviation calculation and control unit, causing the second lifting unit to move the laser contour sensor along the length of the second horizontal moving unit to scan the contour of the steel plate.

[0074] The advantages of this invention are as follows: The device integrates a laser profile sensor and a moving mechanism, enabling high-precision, real-time measurement of the bending curve of the steel plate under test, ensuring the accuracy and reliability of the measurement results. The device achieves automated control through a bending curve deviation calculation and control unit, automatically completing the measurement process, reducing manual intervention, and improving measurement efficiency and accuracy. The device is suitable for measuring steel plates of different sizes, shapes, and materials. By adjusting the positions of the horizontal moving mechanism and the vertical lifting mechanism, it can flexibly adapt to various measurement needs. The bending curve deviation calculation and control unit can receive and process data from the laser profile sensor, outputting intuitive measurement results and analysis reports, facilitating production personnel's understanding of the bending quality of the welded pipe. Optimizing the production process: By measuring and analyzing the bending curve deviation, production personnel can understand the bending performance of the welded pipe, thereby optimizing production process parameters and improving production efficiency and product quality.

[0075] The usage process of this invention is as follows: Before using the device, necessary preparations need to be made, including checking the integrity of the equipment, calibrating the sensors, and setting the measurement parameters. Ensure that the horizontal moving mechanism, vertical lifting mechanism, laser profile sensor, and position signal detector are correctly connected to the bending curve deviation calculation and control unit, and perform initialization settings. Place the bent steel plate to be measured on the conveyor roller support wheel, and drive the steel plate into the measurement area through the conveyor roller support wheel. When the steel plate enters the measurement area, the position signal detector will send a position signal. After receiving the signal, the bending curve deviation calculation and control unit will simultaneously send control signals to the horizontal moving mechanism and the vertical lifting mechanism, enabling them to work together and continuously measure along a predetermined trajectory. Simultaneously, the laser profile sensor begins scanning the steel plate surface and transmits the acquired bending profile data to the control unit in real time for processing and analysis. After the measurement is completed, the bending curve deviation calculation and control unit will display the measurement results in graphical or numerical form, and can output them to a designated location or device as needed. Production personnel can understand the bending quality of the welded pipe based on the measurement results and perform subsequent processing or adjust the production process as needed.

[0076] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connect" should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0077] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An online measurement method for the deviation of the bend curve of UOE welded pipe, characterized in that, Includes the following steps: A1: Detect the steel plate arrival signal. The control unit calculates the bending curve deviation and calls the arrival signal detector to measure the arrival signal of the steel plate at the detection station. Determine whether the steel plate to be tested has entered the detection station. If the steel plate to be tested is not detected, continue to wait; if the steel plate to be tested is detected, proceed to the next step. A2: Read the steel plate specifications to obtain the standard template, and through the process signal interface unit, read the specifications and standard template data of the steel plate to be tested as comparison data, and transmit the acquired data to the bending curve deviation calculation and control unit; A3: Control the horizontal moving mechanism to adjust the sensor position, input the acquired steel plate width data into the bending curve deviation calculation control unit, calculate the bending position of the steel plate, and at the same time control the horizontal moving mechanism to drive the up and down lifting mechanism and the laser profile sensor to move to the bending position on both sides of the steel plate to be measured, so that the bending on both sides of the steel plate is within the horizontal measurement range of the laser profile sensor. A4: Control the up-and-down lifting mechanism to adjust the height of the sensor, input the acquired steel plate thickness data into the bending curve deviation calculation and control unit, control the up-and-down lifting mechanism to move the laser profile sensor to the vertical above the bending position, so that the steel plate bending profile and part of the steel plate straight edge profile are within the vertical measurement range of the laser profile sensor. A5: Collect the contour data of the curved edges on both sides. Through the laser contour sensor, collect the contour curve data of the curved edges on both sides of the upper surface of the steel plate in real time, and transmit the acquired data to the curved edge deviation calculation and control unit. A6: Calculate the bending curve deviation. The bending curve deviation calculation and control unit processes and analyzes the input bending profile curve data, and calculates the magnitude of the bending curve deviation on both sides of the steel plate at the current position according to the bending curve deviation calculation method. A7: Collect steel plate bend profile data multiple times, input the acquired steel plate bend profile data into the bend curve deviation calculation control unit for calculation, and output the bend curve deviation value until the entire steel plate is inspected. A8: Calculate the bending curve deviation. After obtaining all the bending curve deviation data in the length direction of the steel plate, the bending curve deviation calculation and control unit analyzes and compares all the data and calculates the maximum value, which is the bending curve deviation of the welded pipe.

2. The online measurement method for the deviation of the bend curve of UOE welded pipe according to claim 1, characterized in that, Steel plate bend profile data includes, The upper surface contour curves ABC on both sides of the steel plate after bending are as follows: segment AB is the bending contour curve, segment BC is the straight edge contour line, and position B is the intersection of the bending edge and the straight edge contour. The standard template profile curve data includes A'B', which is the curved edge profile curve, and B'C', which is the straight edge profile line. Point B' is the intersection of the curved edge and the horizontal straight edge profile.

3. The online measurement method for the deviation of the bend curve of UOE welded pipe according to claim 2, characterized in that, Step A8: Calculating the deviation of the bend curve Includes the following steps: B1: Select multiple points on the profile curve AB of the steel plate to be tested. Calculate the distance between each point and curve A'B', which is the minimum distance between the point and curve A'B'. Find the maximum distance value from the calculation results, which is the maximum distance between the profile curve AB and the template profile curve A'B'.

4. An online measuring device for the deviation of the bend curve of UOE welded pipe, characterized in that, include, The horizontal moving mechanism is connected to the signal output terminal of the bending curve deviation calculation and control unit. The horizontal moving mechanism is used to provide the moving trajectory. The bending curve deviation calculation and control unit sends control signals to the horizontal moving mechanism to realize repeated movement in the horizontal direction. The vertical lifting mechanism is mounted on the horizontal moving mechanism and can move synchronously with the horizontal moving mechanism. The vertical lifting mechanism is connected to the signal output terminal of the bending curve deviation calculation and control unit. The bending curve deviation calculation and control unit sends control signals to the vertical lifting mechanism to drive it to move along the length direction of the horizontal moving mechanism. A laser profile sensor is used to measure the dimensions of the steel plate profile. The laser profile sensor is mounted on an up-and-down lifting mechanism and can move synchronously with the up-and-down lifting mechanism. The position of the laser profile sensor is adjusted by the horizontal moving mechanism in conjunction with the up-and-down lifting mechanism, so as to facilitate scanning and measuring the steel plate after bending, thereby obtaining the bending profile curve data of the steel plate. The laser profile sensor is connected to the process signal interface of the bending curve deviation calculation and control unit to transmit the acquired data to the bending curve deviation calculation and control unit. The positioning signal detector has its detection end facing the steel plate to be tested. The positioning signal detector is connected to the process signal interface of the bending curve deviation calculation and control unit. The positioning signal detector is used to detect the steel plate to be tested after bending and send the detection data to the bending curve deviation calculation and control unit. The bending curve deviation calculation and control unit integrates a process signal interface, which is used to realize signal transmission and interaction between the bending curve deviation calculation and control unit and the laser contour sensor and the position signal detector.

5. The online measuring device for the deviation of the bend curve of UOE welded pipe according to claim 4, characterized in that, The horizontal movement mechanism includes a first horizontal movement unit and a second horizontal movement unit, which are located on both sides of the conveyor roller support wheel, respectively.

6. The online measuring device for the deviation of the bend curve of UOE welded pipe according to claim 5, characterized in that, The lifting mechanism includes a first lifting unit and a second lifting unit. The first end of the first lifting unit is mounted on a first horizontal moving unit, and a laser contour sensor is mounted on the second end of the first lifting unit. A control command is sent to the first lifting unit by a bending curve deviation calculation and control unit, causing the first lifting unit to move the laser contour sensor along the length of the first horizontal moving unit to scan the contour of the steel plate. The first end of the second lifting unit is mounted on a second horizontal moving unit, and a laser contour sensor is mounted on the second end of the second lifting unit. A control command is sent to the second lifting unit by a bending curve deviation calculation and control unit, causing the second lifting unit to move the laser contour sensor along the length of the second horizontal moving unit to scan the contour of the steel plate.

7. The online measuring device for the deviation of the bend curve of UOE welded pipe according to claim 4, characterized in that, The control module is integrated on the bending curve deviation calculation and control unit. The control module is connected to the horizontal moving mechanism and the vertical lifting mechanism. The control module is used to send control commands to the horizontal moving mechanism and the vertical lifting mechanism.

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