A pipeline machining size precision measurement method, system and device

Abstract

The application relates to the technical field of pipeline size measurement, in particular to a pipeline processing size precision measurement method, system and equipment, which comprises the following steps: acquiring pipeline surface size data of each point on both sides of a pipeline outer surface; fitting the pipeline surface size data of each side of the pipeline outer surface at each time; acquiring a deviation standard coefficient of each side of the pipeline outer surface at each time according to a fitting degree and a distance fluctuation between each pipeline surface size data and a pipeline center; acquiring a pipeline size two-side difference coefficient at each time in combination with a correlation between the pipeline surface size data of both sides of the pipeline outer surface at each time; obtaining an abnormal influence index of pipeline size measurement according to the deviation standard coefficient; further calculating a pipeline outer diameter at each time; adjusting a filter window size during filtering of the pipeline outer diameter according to the abnormal influence index; and acquiring a pipeline outer diameter after filtering. The application can improve the accuracy of pipeline size precision measurement.

Description

Technical Field

[0001] This application relates to the field of pipe size measurement technology, specifically to a method, system and equipment for precision measurement of pipe processing dimensions. Background Technology

[0002] In water supply and drainage systems, PE pipes effectively prevent water pollution. Precision machining and measurement of PE pipe dimensions are crucial, ensuring connection accuracy and sealing performance during installation and use, guaranteeing normal operation and safety. However, during dimensional measurement, lathe vibrations can interfere with pipe stability, leading to fluctuations in measurement readings. Furthermore, due to limitations in the machining process, shallow linear axial weld lines or other depressions and protrusions may appear on the pipe surface, negatively impacting measurement accuracy. Current measurement methods fail to adequately consider the negative impacts of pipe vibration or surface unevenness caused by machining processes, thus resulting in inaccurate dimensional measurements.

[0003] Publication No. CN109827491B discloses a method and device for measuring the size of a large pipeline. By establishing a coordinate system and using a pipeline flange hole positioning mechanism and a light emitting device to determine the coordinate axis, the pipeline size can be measured. However, this method ignores the influence of vibration on the pipeline or measuring equipment on the measurement process, which will lead to instability and poor accuracy of the measurement results. Summary of the Invention

[0004] To address the aforementioned technical problems, the purpose of this application is to provide a method, system, and equipment for precise measurement of pipe processing dimensions. The specific technical solution adopted is as follows:

[0005] In a first aspect, embodiments of this application provide a method for precise measurement of pipe machining dimensions, comprising the following steps:

[0006] The distances from each point on both sides of the outer surface of the pipe to the laser measuring instruments on both sides are recorded as pipe surface dimension data;

[0007] Curve fitting was performed on the pipe surface dimension data of each side of the pipe at each time point. Based on the degree of fitting of the fitted curve and the fluctuation of the distance between each pipe surface dimension data and the pipe center, the deviation standard coefficient of each side of the pipe outer surface at each time point was obtained.

[0008] Analyze the degree of difference between the deviation coefficients on both sides, and combine the correlation between the pipe surface size data on both sides of the pipe outer surface at each time point to obtain the pipe size difference coefficient on both sides at each time point;

[0009] Based on the dispersion of the difference coefficients between the two sides of the pipe size at all times during the measurement process, and the average level of the deviation coefficients from the standard on each side of the pipe surface at all times, the abnormal influence index of pipe size measurement is obtained.

[0010] The pipe outer diameter at each moment is obtained by measuring the distance between the two side laser measuring instruments and the distance between the two side laser measuring instruments and the center point of one side of the outer surface of the pipe. During the filtering process of the pipe outer diameter data, the size of the filtering window is adjusted according to the abnormal influence index to obtain the filtered pipe outer diameter data.

[0011] Preferably, the method for obtaining the deviation coefficient of the standard on each side of the outer surface of the pipe at each time point is as follows:

[0012] The fitting degree of the fitting curve corresponding to the pipe surface dimension data on each side of the pipe at each time point is statistically analyzed, and the deviation standard coefficient of each side of the pipe surface dimension data on each side is obtained by combining the dispersion of the distance between the pipe surface dimension data on each side and the pipe center at each time point.

[0013] Preferably, the calculation of the deviation from the standard coefficient on each side of the outer surface of the pipe at each time point further includes:

[0014] The sum of absolute residuals of the fitted curves corresponding to the pipe surface dimensions on each side of the pipe at each time point is calculated, and the variance of the distance between each pipe surface dimension on each side and the center of the pipe is calculated. The product of the sum of absolute residuals and the variance is used as the deviation standard coefficient of each side of the pipe surface at each time point.

[0015] Preferably, the method for calculating the difference coefficient of the pipe dimensions on both sides at each time point is as follows:

[0016] In the formula, Let be the coefficient of difference in pipe dimensions on both sides at time i. To avoid constants with a denominator of zero, Let Spearman's correlation coefficient be the distance between the pipe surface dimensions on both sides of the pipe's outer surface at time i. are the deviation standard coefficients on both sides of the outer surface of the pipe at the i-th time.

[0017] Preferably, the method for obtaining the anomaly impact index of the pipe size measurement is as follows:

[0018] Calculate the standard deviation of the difference coefficients on both sides of the pipe at all times during the measurement process, and calculate the mean of the deviation standard coefficients on both sides of the outer surface of the pipe at each time during the measurement process to obtain the average result of the mean at all times; the product of the standard deviation and the average result is used as the abnormal influence index of pipe size measurement.

[0019] Preferably, the method for calculating the pipe outer diameter at each time point is as follows: In the formula, The outer diameter of the pipe at the current moment. This represents the distance between the two line laser measuring instruments at the current moment. , These represent the distances between the two laser measuring instruments on either side and the center point on one side of the outer surface of the pipe at the current moment.

[0020] Preferably, the method for adjusting the size of the filter window is as follows:

[0021] The minimum and maximum values ​​of the preset filter window size are used to normalize the abnormal influence index. The product of the normalization result and the maximum value of the preset filter window size is calculated, and the odd number closest to the product is used as the filter window size in the process of filtering the pipe outer diameter data.

[0022] Preferably, when the nearest odd number is less than the minimum value of the preset filter window size, the minimum value is used as the filter window size.

[0023] Secondly, embodiments of this application also provide a precision measurement system for pipe machining dimensions, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, it implements the steps of any of the above-described methods for precision measurement of pipe machining dimensions.

[0024] Thirdly, embodiments of this application also provide a precision measuring device for pipe processing dimensions, wherein the device stores a computer program, and when the computer program is executed by a processor, it implements any of the above-described methods for precision measuring pipe processing dimensions.

[0025] As can be seen from the above, the method, system, and equipment for precise measurement of pipe processing dimensions provided in this application have at least the following beneficial effects:

[0026] This application, through in-depth analysis of the unevenness and deformation characteristics of the pipeline surface, further considers the data differences on both sides caused by the unstable pipeline transport due to lathe vibration. Combining the degree of surface dimension deviation during the overall measurement process, as well as the deviation state and smoothness characteristics of the standard semicircle of the surface, an anomaly influence index is calculated. Its advantage lies in reducing the negative impact of pipeline vibration or surface unevenness caused by processing technology, thus helping to improve the accuracy of precision pipeline dimension measurement. Attached Figure Description

[0027] To more clearly illustrate the technical solutions and advantages in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A flowchart illustrating the steps of a method for precise measurement of pipe machining dimensions provided in this application;

[0029] Figure 2 This is a schematic diagram of the pipe surface dimension data acquisition provided in this application. Detailed Implementation

[0030] To further illustrate the technical means and effects adopted by this application to achieve the intended purpose of the invention, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of a pipe processing dimension precision measurement method, system, and device proposed in this application. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0031] Unless otherwise specified and limited, terms such as “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the article or device that includes said element. Furthermore, the term “and / or” as used herein includes any and all combinations of one or more of the associated listed items. All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0032] The following description, in conjunction with the accompanying drawings, details a specific scheme for a method, system, and equipment for precise measurement of pipe processing dimensions provided in this application.

[0033] Please see Figure 1 The diagram illustrates a flowchart of a method for precise measurement of pipe machining dimensions according to an embodiment of this application, including the following steps:

[0034] Step 1: Obtain the distances from each point on both sides of the outer surface of the pipe to the laser measuring instruments on both sides, and record them as the pipe surface dimension data.

[0035] In the processing of polyethylene pipes, polyethylene resin granules and additives are first added to an extruder. Under the rotation of the screw, the raw material is gradually propelled and heated, causing it to transform from a solid state to a viscous flow state. As the screw continues to rotate, the molten PE material is extruded through the die head and orifice to form a pipe of a specific shape. The extruded pipe is transported horizontally. To measure the pipe dimensions, this application uses a line laser measuring instrument to collect dimensional data of the pipe surface. The line laser measuring instrument projects a laser beam onto the surface of the object being measured, forming a laser line. The line laser measuring instrument can measure the distance between various points on the pipe surface and the line laser measuring instrument.

[0036] To facilitate subsequent analysis, in this embodiment, 20 points are sampled at equal intervals on each side of the pipe's outer surface during the acquisition of pipe surface dimension data. Specifically, a schematic diagram of the pipe dimension data acquisition process is shown below. Figure 2 As shown, Figure 2 Numbered 1 and 2 are line laser measuring instruments, and number 3 is for processing pipes. The two line laser measuring instruments are placed symmetrically on both sides of the pipe, so that the distance from each point on both sides of the outer surface of the pipe to the two line laser measuring instruments can be collected at the same time, which is used as the surface dimension data of the pipe.

[0037] The line laser measuring instrument is fixed in place and can continuously collect pipe surface dimension data at all positions at any time as the pipeline is transported. The time interval for the line laser measuring instrument to collect data is set to 1 second. Thus, the surface dimension data of the pipeline at multiple positions is obtained. Among them, the pipe surface dimension data collected by the two line laser measuring instruments are the dimension data of the outer surface of the pipeline. In this embodiment, it is the distance of each point on both sides of the outer surface of the pipeline from the two line laser measuring instruments.

[0038] Step 2: Fit the pipe surface dimension data of each side of the pipe at each time point. Based on the degree of fitting of , and the fluctuation of the distance between each pipe surface dimension data and the pipe center, obtain the deviation standard coefficient of each side of the pipe outer surface at each time point.

[0039] Polyethylene pipe processing requires heating raw materials to a viscous flow state, followed by extrusion molding. During extrusion, precise control of temperature, pressure, and screw speed is crucial to ensure pipe quality and performance. The process involves heating and cooling stages; improper temperature and parameter control can easily lead to pipe deformation or internal stress. Improper cleaning of the extruder, such as sand or gravel adhering to the sizing sleeve, support plate, or sealing ring, can cause surface bumps and depressions. Even under normal processing conditions, a noticeable linear axial weld line may appear on the pipe surface. Conventional dimensional measurement methods are susceptible to interference from these surface irregularities, resulting in significant measurement errors. Furthermore, vibrations are inevitable during pipe processing. Vibrations from the machining lathe can affect the stability of pipe transport, causing instability in sensor-collected dimensional data, such as laser beam deviation, further impacting the accuracy of dimensional measurements. Therefore, this application aims to improve the accuracy of dimensional measurements by analyzing potential surface defects and unstable pipe transport characteristics during pipe processing.

[0040] First, regarding the unevenness that easily occurs on the pipe surface, in this embodiment, taking the pipe surface dimension data at the i-th moment from any one of the line laser measuring instruments as an example, if the pipe processing surface is smooth and without pit defects, the collected pipe surface dimension data will present a standard and smooth semi-circular shape. If the pits or unevenness of the pipe outer surface at the collected location are more significant, or if internal stress or deformation occurs due to temperature changes, the obtained pipe surface dimension data will be less smooth, with some locations showing obvious depth changes, such as protrusions or depressions. It is also possible that the shape of the pipe surface dimension data will be elliptical, deviating from the standard semi-circular shape.

[0041] Therefore, based on the above analysis, in this embodiment, taking the pipe surface dimension data of any one of the line laser measuring instruments at time i as an example, a polynomial fitting technique is used to fit the pipe surface dimension data of any one of the line laser measuring instruments at time i to obtain the corresponding curve. The degree of fitting reflects the smoothness of the pipe surface at that position. In this embodiment, the degree of fitting is obtained by calculating the sum of absolute residuals, and the result is denoted as... The result The larger the value, the more likely there are depressions or protrusions on the pipe surface, and the less smooth the pipe surface is at that location. Then, the two endpoints of the pipe surface dimensions are obtained in a Cartesian coordinate system. Based on the characteristic that the line connecting the endpoints to the line laser measuring instrument is perpendicular to the line connecting the endpoints to the center of the circle, the corresponding center coordinates can be obtained. The more the collected data conforms to the standard semicircle pattern, the more consistent the distances between each data point and the center. Therefore, for any side of the pipe's outer surface, the distance between each pipe surface dimension and the pipe center is calculated, and the variance of all these distances is calculated. In this embodiment, this is denoted as the semicircle pattern deviation of any side of the pipe's outer surface, and is recorded as... This value reflects the deviation characteristics between the collected pipe surface dimension data and the standard semicircle. It should be noted that the distance between the pipe surface dimension data and the pipe center can be measured using existing distance measurement methods, and the implementer does not impose any special restrictions on this. In this embodiment, Euclidean distance is used for measurement.

[0042] Further, the deviation standard coefficient for each side of the pipe's outer surface at the i-th time point is calculated, and the product of the absolute residual and the variance is used as the deviation standard coefficient for each side of the pipe's outer surface at each time point. Preferably, in this embodiment, the expression for the deviation standard coefficient for one side is: The result This reflects the smoothness of one side of the pipe surface and the degree of deviation of that side from the standard semicircle.

[0043] Correspondingly, for the pipe surface dimension data collected by the laser measuring instrument on the other side at the i-th time, the deviation from the standard coefficient on the other side can be obtained by using the same calculation steps described above. In this embodiment, it is denoted as... The result It reflects the smoothness of the other side of the outer surface of the pipe at the i-th time point and the degree of deviation of that other side from the standard semicircle.

[0044] Step 3: Analyze the degree of difference between the deviation coefficients on both sides, and combine the correlation between the pipe surface size data on both sides of the pipe at each time point to obtain the pipe size difference coefficient on both sides at each time point.

[0045] Furthermore, considering that under ideal conditions, the distance between the pipe and the two linear laser measuring instruments is the same, and the corresponding data are also quite similar, the pipe dimensional measurement process may be affected by lathe vibration, leading to unstable pipe transport and causing inconsistencies in the distance between the pipe and the two linear laser measuring instruments at a certain moment. This results in deviations in the pipe surface dimensional data collected from both sides at that moment. Therefore, the stability characteristics of the pipe dimensional measurement at a certain moment are obtained. The Spearman correlation coefficient between the pipe surface dimensional data collected by the two linear laser measuring instruments on both sides of the pipe's outer surface at the i-th moment is calculated, and the Spearman correlation coefficient between the pipe surface dimensional data on both sides of the pipe's outer surface at the i-th moment is denoted as . . This reflects the similarity between the pipe surface dimensions on both sides of the pipe at that moment.

[0046] Furthermore, due to the flexibility of polyethylene pipes, they undergo deformation during vibration, resulting in changes to their surface unevenness and the degree of matching with the semicircle. Consequently, differences exist between the fitting coefficients of the deviation from the standard semicircles and the smoothness characteristics on both sides. Therefore, the difference coefficient between the two sides of the pipe size due to vibration during pipe size measurement is calculated. In this embodiment, the specific calculation formula for the difference coefficient between the two sides of the pipe size at each time point is as follows:

[0047] ;

[0048] in, Let be the coefficient of difference in pipe dimensions on both sides at time i. Let be the Spearman correlation coefficient between the pipe surface dimensions on both sides of the pipe's outer surface at time i. are the deviations from the standard coefficients on both sides of the outer surface of the pipe at the i-th time point. To avoid constants with a denominator of zero, The value range is [-1, 1]. To avoid a denominator of 0, this embodiment sets... The value range is [1.1, 1.2], and in this embodiment, the value is 1.1. The obtained... It is used to reflect the similarity of pipe size data on both sides of the outer surface of the pipe during pipe size measurement and the degree of deviation from the standard semicircle.

[0049] Step 4: Based on the dispersion of the difference coefficients between the two sides of the pipe size at all times during the measurement process, and the average level of the deviation coefficients from the standard on each side of the pipe surface at all times, the abnormal influence index of the pipe size measurement is obtained.

[0050] Furthermore, since extruder dies may employ a multi-channel design, the melt from different channels may converge to form a linear axial weld line, caused by inconsistencies in melt temperature, flow velocity, or pressure. This is common in large PE pipes, and shallow weld lines do not affect the normal use of the pipe. However, intermittent pits or protrusions on the pipe surface can severely affect the accuracy of precise dimensional measurements, causing significant fluctuations in the pipe surface dimensional data collected at continuous intervals. If weld lines exist on the pipe surface, the pipe surface dimensional data will be relatively stable at continuous intervals. Therefore, the characteristics of the changes in the smoothness of the pipe surface dimensional data collected at each time point are obtained. The standard deviation of the difference coefficients on both sides of the pipe at all times during the pipe dimensional measurement process is then calculated. This standard deviation reflects the degree of deviation of the measured surface dimensions at different locations on the pipe. The mean of the deviation standard coefficients on both sides of the pipe outer surface at each time point during the measurement process is then calculated, and the average of these mean values ​​at all times is obtained. This average result reflects the overall smoothness characteristics of the pipe surface and its degree of matching with a standard circle. The product of the standard deviation and the average result is used as the anomaly influence index for pipe dimensional measurement. The larger the anomaly measurement index, the greater the influence of surface unevenness and pipe vibration on the pipe size during the measurement process.

[0051] Step 5: Obtain the outer diameter of the pipe at each moment by measuring the distance between the two side laser measuring instruments and the distance between the two side laser measuring instruments and the center point of one side of the outer surface of the pipe. During the filtering process of the pipe outer diameter data, adjust the size of the filtering window according to the abnormal influence index to obtain the filtered pipe outer diameter data.

[0052] This embodiment analyzes the unevenness and deformation characteristics of the pipe surface in depth, further considering the data differences on both sides caused by the unstable pipe transport due to lathe vibration. Combining the degree of surface dimension deviation during the overall measurement process, the deviation state of the standard semicircle of the surface, and the smoothness characteristics, an anomaly influence index is calculated. This anomaly influence index reflects the degree to which the pipe dimensions are affected by surface unevenness and pipe vibration during the measurement process. Since the line laser measuring instrument is symmetrically placed on both sides of the pipe surface, this embodiment calculates the pipe outer diameter at each moment. The formula for calculating the pipe outer diameter at the current moment is:

[0053] ;

[0054] in, The outer diameter of the pipe at the current moment. This represents the distance between the two line laser measuring instruments at the current moment. , These represent the distances between the two laser measuring instruments on either side and the center point on one side of the outer surface of the pipe at the current moment.

[0055] This allows us to obtain the pipe's outer diameter data at various moments during the transportation process. To improve data accuracy, this embodiment employs the Savitzky-Golay polynomial filtering algorithm to smooth the pipe's outer diameter data. Generally, the window size of this algorithm ranges from 3 to 21 during the filtering process. In actual pipe outer diameter measurements, the data exhibits diverse variations due to differences in measurement conditions, status, and the degree of abnormal influences. Therefore, this embodiment adjusts the window size parameters according to different situations to improve the accuracy of the pipe size measurement results.

[0056] Specifically, a larger anomaly impact index in the precise measurement of pipe dimensions indicates a more significant impact on the dimensional measurement, potentially leading to greater fluctuations in the outer diameter data. In this case, a larger window size should be set for better smoothing. Conversely, a smaller anomaly impact index indicates a smaller impact on the dimensional measurement, allowing for the setting of a smaller window size to retain more details of the outer diameter data. Therefore, the anomaly impact index is normalized, and the product of the normalization result and the maximum value of the filtering window size is calculated. The nearest odd number to this product is used as the filtering window size in the filtering process for the pipe outer diameter data. When this nearest odd number is less than the minimum value of the filtering window size, the minimum value is used as the filtering window size.

[0057] Preferably, in this embodiment, the tanh function is used to normalize the abnormal influence index, and then the product of the normalized result and the maximum window size 21 is calculated. The odd number closest to the product is used as the window size of the algorithm. In this embodiment, the minimum window size is set to 3. When the nearest odd number is less than 3, 3 is used as the filtering window size. Then, the Savitzky-Golay polynomial filtering algorithm is used to filter the pipe outer diameter data, which helps to obtain more accurate pipe size measurement data. It should be noted that the specific process of data filtering by the Savitzky-Golay polynomial filtering algorithm is a well-known existing technology and will not be described in detail in this embodiment.

[0058] Based on the same inventive concept as the above method, this application also provides a precision measurement system for pipe processing dimensions, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, it implements the steps of any one of the above-described methods for precision measurement of pipe processing dimensions.

[0059] Meanwhile, this application also provides a precision measuring device for pipe processing dimensions, wherein the device stores a computer program, and when the computer program is executed by a processor, it implements any one of the above-described methods for precision measuring pipe processing dimensions.

[0060] It is understood that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, the above description focuses on specific embodiments of this specification. Additionally, the processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired results. In some implementations, multitasking and parallel processing are possible or may be advantageous.

[0061] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0062] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Any equivalent structural or procedural transformations made based on the description and drawings of this application, or direct or indirect applications in other related technical fields, are similarly included within the protection scope of this application.

Claims

1. A method for precise measurement of pipe machining dimensions, characterized in that, Includes the following steps: The distances from each point on both sides of the outer surface of the pipe to the laser measuring instruments on both sides are recorded as pipe surface dimension data. Curve fitting was performed on the pipe surface dimension data of each side of the pipe at each time point. Based on the degree of fitting of the fitted curve and the fluctuation of the distance between each pipe surface dimension data and the pipe center, the deviation standard coefficient of each side of the pipe outer surface at each time point was obtained. Analyze the degree of difference between the deviation coefficients on both sides, and combine the correlation between the pipe surface size data on both sides of the pipe outer surface at each time point to obtain the pipe size difference coefficient on both sides at each time point; Based on the dispersion of the difference coefficients between the two sides of the pipe size at all times during the measurement process, and the average level of the deviation coefficients from the standard on each side of the pipe surface at all times, the abnormal influence index of pipe size measurement is obtained. The outer diameter of the pipe at each moment is obtained by measuring the distance between the two side laser measuring instruments and the distance between the two side laser measuring instruments and the center point of one side of the outer surface of the pipe. During the filtering process of the pipe outer diameter data, the size of the filtering window is adjusted according to the abnormal influence index to obtain the filtered pipe outer diameter data. The method for obtaining the deviation standard coefficient of each side of the outer surface of the pipe at each time point is as follows: The fitting degree of the fitting curve corresponding to the pipe surface size data on each side of the pipe at each time point is statistically analyzed, and the deviation standard coefficient of each side of the pipe surface at each time point is obtained by combining the dispersion of the distance between each pipe surface size data on each side and the pipe center. The calculation method for the difference coefficient of the pipe size on both sides at each time point is as follows: In the formula, Let be the coefficient of difference in pipe dimensions on both sides at time i. To avoid constants with a denominator of zero, their values ​​are set to [1.1, 1.2]. Let Spearman's correlation coefficient be the distance between the pipe surface dimensions on both sides of the pipe's outer surface at time i. These are the deviation coefficients of the two sides of the outer surface of the pipe at the i-th time point; The method for obtaining the anomaly impact index of the pipe size measurement is as follows: Calculate the standard deviation of the difference coefficients on both sides of the pipe at all times during the measurement process, and calculate the mean of the deviation standard coefficients on both sides of the outer surface of the pipe at each time during the measurement process to obtain the average result of the mean at all times; the product of the standard deviation and the average result is used as the abnormal influence index of pipe size measurement.

2. The method for precise measurement of pipe processing dimensions as described in claim 1, characterized in that, The calculation of the deviation from the standard coefficient on each side of the outer surface of the pipe at each time point further includes: The sum of absolute residuals of the fitted curves corresponding to the pipe surface dimensions on each side of the pipe at each time point is calculated, and the variance of the distance between each pipe surface dimension on each side and the center of the pipe is calculated. The product of the sum of absolute residuals and the variance is used as the deviation standard coefficient of each side of the pipe surface at each time point.

3. The method for precise measurement of pipe processing dimensions as described in claim 1, characterized in that, The method for calculating the pipe outer diameter at each time point is as follows: In the formula, The outer diameter of the pipe at the current moment. This represents the distance between the two line laser measuring instruments at the current moment. , These represent the distances between the two laser measuring instruments on either side and the center point on one side of the outer surface of the pipe at the current moment.

4. The method for precise measurement of pipe processing dimensions as described in claim 1, characterized in that, The method for adjusting the size of the filtering window is as follows: The minimum and maximum values ​​of the preset filter window size are used to normalize the abnormal influence index. The product of the normalization result and the maximum value of the preset filter window size is calculated, and the odd number closest to the product is used as the filter window size in the process of filtering the pipe outer diameter data.

5. The method for precise measurement of pipe processing dimensions as described in claim 4, characterized in that, When the nearest odd number is less than the minimum preset filter window size, the minimum value is used as the filter window size.

6. A precision measurement system for pipe machining dimensions, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method for precise measurement of pipe machining dimensions as described in any one of claims 1-5.

7. A precision measuring device for pipe processing dimensions, wherein the device stores a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for precise measurement of pipe machining dimensions as described in any one of claims 1-5.

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