Method for measuring the size of a large-diameter steel pipe and steel pipe size measuring device

Abstract

The present application relates to the field of industrial measurement technology, and provides a method for non-contact measurement of the outer diameter size of a large-diameter steel pipe using a laser, which can combine the characteristics of laser measurement range, and the method comprises the following steps: S1: positioning the steel pipe; S2: dividing the steel pipe into a center region part and a first sub-region part and a second sub-region part on both sides of the center region part along a first direction; the first direction is a certain radial direction of the steel pipe; S3: measuring the span value of the center region part in the first direction to obtain a1; S4: scanning and measuring the first sub-region part using a laser sensor to obtain the maximum span value b1 of the first sub-region part in the first direction; S5: scanning and measuring the second sub-region part using a laser sensor to obtain the maximum span value c1 of the second sub-region part in the first direction; and S6: adding a1, b1 and c1 to obtain the outer diameter size of the steel pipe in a radial direction.

Description

Technical Field

[0001] This invention relates to the field of industrial measurement technology, and more specifically to a method and apparatus for measuring the dimensions of large-diameter steel pipes. Background Technology

[0002] Currently, steel pipe dimensional measurement technologies mainly include manual contact measurement, ultrasonic measurement, eddy current measurement, and laser measurement. To avoid potential damage to the steel pipe surface during the measurement process, non-contact measurement technologies are receiving increasing attention and are developing rapidly.

[0003] Among various non-contact measurement methods, laser measurement technology is widely considered to have good application prospects due to its high theoretical accuracy and fast response speed. However, existing laser measurement technology still has certain limitations. Its high-precision measurement usually depends on a small effective measurement range, which makes it difficult to apply to the measurement of the outer diameter of large-diameter steel pipes. Summary of the Invention

[0004] One of the objectives of this invention is to address the shortcomings of existing technologies by providing a method for non-contact measurement of the outer diameter of large-diameter steel pipes using lasers, taking advantage of the characteristics of laser measurement range.

[0005] A second objective of this invention is to provide a steel pipe size measuring device adapted to the above-mentioned measurement method.

[0006] The overall technical solution of this invention is as follows:

[0007] This invention addresses the problem that existing laser measurement technology is often difficult to apply to the measurement of the outer diameter of large-diameter steel pipes.

[0008] Based on this, the present invention proposes a method for measuring the dimensions of large-diameter steel pipes, the method comprising:

[0009] S1: Position the steel pipe;

[0010] S2: Divide the steel pipe along the first direction into: a central area, and a first section and a second section located on both sides of the central area;

[0011] The first direction is a radial direction of the steel pipe;

[0012] S3: Measure and determine the span value of the central region portion in the first direction to obtain a1;

[0013] S4: Use a laser sensor to scan and measure a section to obtain its maximum span value b1 in the first direction;

[0014] S5: Use a laser sensor to scan and measure the two-part section to obtain its maximum span value c1 in the first direction;

[0015] S6: Add a1, b1, and c1 together to obtain the outer diameter of the steel pipe in one radial direction. .

[0016] In the above scheme, by decomposing the complex task of overall outer diameter measurement into independent measurements of the central region and two edge sections, the difficulty of measurement implementation and the stringent requirements on sensor range are reduced. Specifically: the dimensions of the central section can be measured using measuring tools (such as rulers) (this part of the measurement only requires determining the straightness length and does not involve complex positioning measurements of the outer curved surface; measuring tools can be used to measure it relatively accurately); then, a laser sensor is used to measure the edge areas that are difficult to measure using a high-precision laser scanning method, and finally the results are combined to obtain the outer diameter dimensions.

[0017] In this measurement method, the laser sensor does not need to measure the entire large-diameter steel pipe, but only a small area. It fully combines the small-range measurement characteristics of the laser sensor, leverages the advantages of different measurement technologies, and achieves high-precision and high-efficiency measurement of the outer diameter of large-diameter steel pipes.

[0018] In some implementations, after S6, the following is also included:

[0019] S7: Rotate the steel pipe and reposition it, then repeat steps S2 to S6 to obtain the outer diameter of the steel pipe in another radial direction. ;

[0020] S8: Repeat step S7 to obtain a total of n outer diameter dimensions for the steel pipes, which are as follows: , to ;

[0021] S9: Process multiple outer diameter dimensions to obtain the average outer diameter value and ellipticity of the steel pipe;

[0022] Among them, the average outer diameter value , ;

[0023] Ellipticity , for , to The maximum value in, for , to The minimum value in.

[0024] The method has been upgraded from a simple, single-point dimensional measurement method to a comprehensive inspection method that can assess the geometric quality of steel pipes, thus obtaining more complete steel pipe dimensions.

[0025] In some embodiments, the feature is that: in S4, the laser sensor emits a laser to form a light curtain perpendicular to the axis of the steel pipe and the first direction;

[0026] By placing a section within a light curtain, a laser sensor measures and obtains the maximum span value b1 of the section in a first direction.

[0027] In some embodiments, the feature is that: in S5, the laser sensor emits a laser to form a light curtain perpendicular to the axis of the steel pipe and the first direction;

[0028] By placing the two-part section within a light curtain, the laser sensor measures and acquires the maximum span value c1 of the two-part section in the first direction.

[0029] Based on the positional characteristics of outer diameter detection, a light curtain perpendicular to the steel pipe axis and the first direction is formed by limiting the laser sensor, which can further improve the detection accuracy.

[0030] Furthermore, the present invention proposes a steel pipe size measuring device, which includes:

[0031] The support has a fixing structure for positioning the steel pipe, and the fixing structure has a cylindrical space for the steel pipe to be fitted and accommodated.

[0032] A laser frame is connected to a laser sensor. There are two laser sensors that are spaced apart along a first straight line direction, which is configured as a radial direction of a cylindrical space.

[0033] In the first straight line direction, the interval between the two laser sensors is configured to be smaller than the maximum span of the cylindrical space in that first straight line direction.

[0034] Furthermore, each laser sensor is configured such that its laser emission direction is perpendicular to the first straight line direction, and is used to measure the maximum projected size of the steel pipe surface in the first straight line direction when the steel pipe is contained in the cylindrical space.

[0035] The above solution provides a steel pipe size measuring device that is applicable to the above-mentioned steel pipe size measurement method and can use a laser sensor to perform high-precision and high-efficiency measurement of the outer diameter of large-diameter steel pipes.

[0036] In some embodiments, the retention structure includes:

[0037] The support base is constructed such that it provides bottom support for a horizontally placed steel pipe and forms a columnar space at its upper end.

[0038] A sliding assembly positioned on one side of a cylindrical space, having a sliding seat that moves axially upward within the cylindrical space;

[0039] A lifting assembly connected to a sliding base has a lifting base that can move vertically.

[0040] The chuck, which is connected to the lifting base, is configured as follows:

[0041] When a steel pipe is placed in a cylindrical space, one end of the steel pipe can be clamped to make the steel pipe in a locked state that cannot be moved, and the clamping of the steel pipe can also be released to make the steel pipe in an unlocked state that can be moved.

[0042] The fixed structure ensures the stability of the steel pipe during the measurement process; the spacing between the two laser sensors directly corresponds to the "zonal measurement" in the method, ensuring the automatic division and connection of the measurement interval, thus optimizing the accuracy and reliability of the measurement results from a hardware perspective.

[0043] In some embodiments, the upper end of the support base is provided with an upward-opening positioning groove, which is configured to extend horizontally and have both ends through to accommodate a horizontally extending steel pipe.

[0044] The width of the positioning groove gradually decreases from top to bottom.

[0045] By setting up positioning slots, steel pipes can quickly and accurately roll into predetermined measurement positions and be initially positioned, thereby improving feeding efficiency and initial positioning accuracy.

[0046] In some embodiments, the chuck is rotatably connected to the lifting seat and is configured to be able to rotate relative to the lifting seat, with its axis of rotation parallel to the axis of the cylindrical space.

[0047] The chuck drive connection includes a rotating device that drives the chuck to rotate.

[0048] In some embodiments, the retention structure further includes:

[0049] A fixed seat is placed on the other side of the cylindrical space, and its rotatable connection is a support column;

[0050] The chuck, support column, and support base together form a cylindrical space.

[0051] Furthermore, the support column is constructed such that it rotates around the axis of the cylindrical space, and when a steel pipe is housed in the cylindrical space, it provides axial support to the other end of the steel pipe.

[0052] The chuck is driven by a rotating device, and the support column on the opposite side is set to rotate in coordination, so that the clamped steel pipe can be rotated directly, smoothly and accurately without disassembly, thus realizing multi-dimensional dimensional measurement of the steel pipe.

[0053] In some embodiments, the support is provided with a push rod device having a piston rod that moves vertically up and down;

[0054] A stop plate is fixed to the piston rod, which rises and falls synchronously with the piston rod and is configured to move to:

[0055] Located between the chuck and the support column, so as to define the first position of the space for placing the steel pipe together with the support column;

[0056] And, the second position located outside the cylindrical space.

[0057] By setting a stop plate, the steel pipe can be pre-positioned when using a chuck for clamping and fastening, so that the subsequent chuck can clamp and fix the steel pipe more quickly and accurately, improving the overall testing efficiency and stability.

[0058] The main beneficial effects of the above technical solution are as follows:

[0059] By combining the characteristics of laser measurement with the outer diameter characteristics of large-diameter steel pipes, a method has been developed that uses lasers to measure the outer diameter of large-diameter steel pipes, enabling high-precision and high-efficiency measurement of their outer diameter.

[0060] A steel pipe size measuring device is developed that is applicable to the above-mentioned steel pipe size measuring method. It can use a laser sensor to measure the outer diameter of large-diameter steel pipes with high precision and high efficiency. Attached Figure Description

[0061] The present invention will now be further described with reference to the accompanying drawings.

[0062] Figure 1 This is a schematic diagram of the overall structure of the steel pipe size measuring device.

[0063] Figure 2 This is a side view of the steel pipe size measuring device.

[0064] Figure 3 This is a structural diagram of the sliding component and the lifting component.

[0065] Figure 4 A schematic diagram of the positioning plate structure.

[0066] Figure 5 This is a schematic diagram of laser sensor measurement.

[0067] Figure 6This is a schematic diagram of the ellipticity of the steel pipe.

[0068] Figure 7 This is a logical diagram illustrating a method for measuring the dimensions of large-diameter steel pipes. Detailed Implementation

[0069] The present invention will be specifically illustrated below with reference to embodiments:

[0070] Example 1:

[0071] A method for measuring the dimensions of large-diameter steel pipes, used to measure the outer diameter (m) of large-diameter steel pipes.

[0072] The method for measuring the dimensions of large-diameter steel pipes in this embodiment includes:

[0073] S1: Position the steel pipe m; for example, use a clamping structure (such as the chuck 1.4 described below or a similar clamping structure, such as a robotic arm) to position the steel pipe m and keep it fixed.

[0074] S2: Along the first direction, the steel pipe m is divided into: a central region, and two secondary regions, b and c, located on either side of the central region a. See Appendix for specific distinctions. Figure 5 As shown.

[0075] Specifically, the cross-section (perpendicular to the axial direction of the steel pipe m) of the portion of the steel pipe m whose outer diameter needs to be measured is divided along a first direction into: a central region a, and two secondary regions b and c located on either side of the central region a. The area of ​​each region is set according to the measurement requirements of the laser sensor, so that the laser sensor can measure the secondary region b and the secondary region c as described below.

[0076] The first direction is a radial direction of the steel pipe m.

[0077] S3: Measure, for example, with a measuring ruler, and determine the span value of the central region portion a in the first direction to obtain a1, such as... Figure 5 As shown.

[0078] S4: Using laser sensor 3, a section b is scanned and measured to obtain its maximum span value b1 in the first direction, such as... Figure 5 As shown.

[0079] S5: Use laser sensor 3 to scan and measure the two-part section c to obtain its maximum span value c1 in the first direction, such as Figure 5 As shown.

[0080] S6: Add a1, b1, and c1 to obtain the outer diameter of the steel pipe m in one radial direction. .

[0081] The laser sensor 3 includes a laser emitter 3.1 for emitting laser light and a receiver 3.2 for receiving the emitted laser light, and also includes a control module electrically connected to the receiver 3.2 and the laser emitter 3.1.

[0082] The laser emitter 3.1 emits a laser beam, which is received by the receiver 3.2 to form a light curtain.

[0083] The control module is configured to receive the area information of the laser received by receiver 3.2.

[0084] like Figure 5 As shown, a laser emitter 3.1 is placed on one side of a section b of the steel pipe m, and a receiver 3.2 is placed on one side of the section b, so that the light curtain x formed by it is perpendicular to the axis of the steel pipe m and the first direction.

[0085] By placing a section b within the light curtain x of the laser sensor, the light curtain x in the laser sensor is obscured by the section b of the steel pipe m. The distance from the highest point of the outer surface protrusion of the section b to the central region a in the first direction is the maximum span value b1 of the section b in the first direction. This value b1 also represents one component of the outer diameter of the steel pipe m in a certain radial direction parallel to the first direction.

[0086] like Figure 5 As shown, another laser emitter 3.1 is placed on one side of the two-section section c of the steel pipe m, and the receiver 3.2 is placed on the other side of the two-section section c, so that the light curtain y formed by it is perpendicular to the axis of the steel pipe m and the first direction.

[0087] By placing the two-section portion c within the light curtain y of the laser sensor, the light curtain y in the laser sensor is obscured by the two-section portion c of the steel pipe m. The distance from the highest point of the outer surface protrusion of the two-section portion c to the central region portion a in the first direction is the maximum span value c1 of the two-section portion c in the first direction. This value c1 also represents one component of the outer diameter value of a certain radial direction of the steel pipe m parallel to the first direction.

[0088] At this point, by adding a1, b1, and c1, the outer diameter of the steel pipe m in one radial direction can be obtained. .

[0089] Furthermore, based on S6, the average outer diameter and ellipticity of the steel pipe can be further measured to obtain the value.

[0090] Specifically, methods for measuring the dimensions of large-diameter steel pipes may also include:

[0091] S7: Rotate the steel pipe m and reposition it, then repeat steps S2 to S6 to obtain the outer diameter of the steel pipe m in another radial direction. .

[0092] S8: Repeat step S7 to obtain a total of n outer diameter dimensions of steel pipe m, which are as follows: , to .

[0093] S9: Process multiple outer diameter dimensions to obtain the average outer diameter value and ellipticity of the steel pipe (m).

[0094] Among them, the average outer diameter value The result is obtained by summing all measured outer diameters (m) of the steel pipe and dividing by the number of measurements. For example: , .

[0095] Ellipticity The value is obtained by subtracting the minimum value from the maximum value of the outer diameter (m) of the steel pipe obtained from all measurements. For example: , for , to The maximum value in, for , to The minimum value in.

[0096] Example 2:

[0097] Steel pipe size measuring device, such as Figure 1 As shown, it includes a support 1 for providing support, and a fixing structure for positioning the steel pipe m is provided on the support 1. The fixing structure has a cylindrical space for the steel pipe m to be adapted and accommodated.

[0098] The cylindrical space is a fixed structure that houses a steel pipe m, and the space occupied by the steel pipe m when the steel pipe m is fixed.

[0099] like Figure 1 As shown, the fixing structure in this embodiment includes a support seat 1.1 that is fixed to the bracket 1 by means of, for example, screws. There are one or more support seats 1.1, which are distributed in a horizontal direction to provide bottom support for the horizontally placed steel pipe m. The upper end of the support seat 1.1 forms a cylindrical space for the steel pipe m to be adapted and accommodated.

[0100] In this embodiment, as Figures 1 to 2As shown, the upper end of the support 1.1 is provided with an upward-opening positioning groove 1.11. This positioning groove 1.11 extends horizontally, and its two ends are connected in the horizontal direction to accommodate the insertion of a horizontally extending steel pipe m (e.g. Figure 1 (As shown in the figure). In the direction from top to bottom, the width of the groove 1.11 gradually decreases to restrict the steel pipe m and prevent it from rolling in the positioning groove 1.11.

[0101] A sliding assembly 1.2 is provided on one side of the cylindrical space. The sliding assembly 1.2 has a sliding seat 1.21 that moves axially in the cylindrical space. For example, the sliding assembly 1.2 is a linear motor or a lead screw motor, etc., which has a slider that slides laterally, and the slider forms the sliding seat 1.21.

[0102] A lifting assembly 1.3 is connected to the sliding seat 1.21, which has a lifting seat 1.31 that moves vertically. For example, the lifting assembly 1.3 is a push rod motor, whose piston rod extends vertically and is connected to the lifting seat 1.31.

[0103] The lifting seat 1.31 is connected to a chuck 1.4. The chuck 1.4 is adapted to the steel pipe m and is configured such that when the steel pipe m is contained in the cylindrical space, it can clamp one end of the steel pipe m to make the steel pipe m in a locked state that cannot be moved, and it can also release the clamping of the steel pipe m to make the steel pipe m in an unlocked state that can be moved.

[0104] For example, chuck 1.4 can be the three-jaw chuck disclosed in announcement number CN110695387B, or the pneumatic three-jaw chuck disclosed in announcement number CN208132014U.

[0105] The sliding assembly 1.2 and the lifting assembly 1.3 drive the chuck 1.4 to move, thereby clamping the steel pipe m or leaving space for the steel pipe m to be picked up / placed.

[0106] like Figures 1 to 2 As shown, a laser frame 2 is also connected to the support 1, and a laser sensor 3 is connected to the laser frame 2. There are two laser sensors 3, which are distributed at intervals along a first straight line direction. This first straight line direction is constructed as a radial direction of a cylindrical space.

[0107] In the first straight line direction, the interval between the two laser sensors 3 is configured to be smaller than the maximum span of the cylindrical space in that direction, i.e., the outer diameter of the steel pipe m when it is fitted and filled in the cylindrical space. In this case, the interval between the two laser sensors 3 is the value of a1 in Embodiment 1.

[0108] Furthermore, each laser sensor 3 is configured such that its laser emission direction is perpendicular to the first straight direction (such as the first direction in Embodiment 1), and is used to measure the maximum projected size of the surface of the steel pipe m in the first straight direction when the steel pipe m is contained in the cylindrical space.

[0109] Specifically, such as Figure 2 As shown, each laser sensor 3 includes a laser emitter 3.1 for emitting laser light and a receiver 3.2 for receiving the emitted laser light, as well as a control module electrically connected to the receiver 3.2 and the laser emitter 3.1.

[0110] The laser emitter 3.1 emits a laser beam, which is received by the receiver 3.2 to form a light curtain.

[0111] The control module is configured to receive the area information of the laser received by receiver 3.2.

[0112] For example Figure 2 As shown, for each laser sensor 3, its laser emitter 3.1 is located at the lower end of the steel pipe m, and its receiver 3.2 is located at the upper end of the steel pipe m and aligned vertically with the laser emitter 3.1. At this time, the laser emitter 3.1 emits laser light, which is received by the receiver 3.2 to form a light curtain.

[0113] The laser emitted by the laser sensor 3 is perpendicular to the first straight line direction and can also be perpendicular to the axis of the cylindrical space, that is, the cylindrical space is adapted to accommodate the steel pipe m, which is perpendicular to the axis of the steel pipe m.

[0114] At this time, for example Figure 2 and Figure 5 As shown, in the first straight line direction, a portion of the left side of the steel pipe m (partition b) is housed in the left light curtain (light curtain x); a portion of the right side of the steel pipe m (partition c) is housed in the left light curtain (light curtain y). By means of the method described in Embodiment 1, the laser sensor 3 can measure and obtain the maximum projected dimensions of the two sides of the surface of the steel pipe m in the first straight line direction when the steel pipe m is housed in the cylindrical space, namely b1 and c1 in Embodiment 1 respectively.

[0115] The laser mount 2 can be fixedly attached to the support 1 without being moved.

[0116] Alternatively, the laser mount 2 can be slidably mounted on the support 1 using, for example, a slide rail structure, and can slide along the axial direction of the cylindrical space so that the outer diameter of the cross section at different positions of the steel pipe m can be measured axially.

[0117] In the above scheme, the chuck 1.4 can be fixed to the lifting seat 1.31.

[0118] Alternatively, the chuck 1.4 is hinged to the lifting seat 1.31 and is configured to rotate relative to the lifting seat 1.31 with its axis of rotation parallel to the axis of the cylindrical space.

[0119] At this time, the chuck 1.4 is connected to a rotating device 1.5 that drives the chuck 1.4 to rotate. The rotating device 1.5 can be a rotating motor, and its rotating shaft is connected to the chuck 1.4 via, for example, a transmission belt or gear, so as to drive the chuck 1.4 to rotate.

[0120] The chuck 1.4 clamps one end of the steel pipe m and then rotates it, which drives the steel pipe m to rotate, so as to measure the outer diameter of the steel pipe m in different radial directions.

[0121] like Figure 1 As shown, the stabilizing structure also includes a stabilizing seat 1.6 located on the other side of the cylindrical space, which is rotatably connected to a support column 1.61. The chuck 1.4, the support column 1.61, and the support seat 1.1 together form a cylindrical space; the support column 1.61 is configured to rotate around the axis of the cylindrical space, and when a steel pipe m is housed in the cylindrical space, it provides axial support to the other end of the steel pipe m.

[0122] In this embodiment, the other end of the cylindrical space opposite sliding component 1.2 may also be provided with a linear motor or a lead screw motor, which has a slider that slides laterally and forms a fixed seat 1.6.

[0123] At this point, the sliding seat 1.21 and the fixed seat 1.6 can be spaced apart to allow space for the installation or removal of the steel pipe m. However, when the steel pipe m is positioned in the positioning groove 1.11, the sliding seat 1.21 and the fixed seat 1.6 can move closer to each other until, along the axial direction of the steel pipe m, the chuck 1.4 clamps one end of the steel pipe m, and the support column 1.61 presses down on and fixes the other end of the steel pipe m, thus achieving further clamping and fixing of the steel pipe m.

[0124] Furthermore, when the chuck 1.4 and the support column 1.61 jointly clamp the steel pipe m, the chuck 1.4 needs to be moved so that its rotation axis is collinear with the axis of the steel pipe m. At this time, the rotation axis of the support column 1.61 is also collinear with the axis of the steel pipe m; when the chuck 1.4 drives the steel pipe m to rotate, the support column 1.61 rotates coaxially.

[0125] like Figure 4 As shown, a push rod device 4, such as a push rod motor, can also be provided on the bracket 1, and the piston rod 4.1, which is telescopically movable, is arranged vertically to lift and lower in the vertical direction.

[0126] The piston rod 4.1 is fixedly connected to a stop plate 5, which moves up and down synchronously with the piston rod 4.1 and is configured to move to: a first position between the chuck 1.4 and the support column 1.61, so as to define the space for placing the steel pipe m together with the support column 1.61; and a second position outside the cylindrical space.

[0127] Before the chuck 1.4 and support column 1.61 jointly clamp the steel pipe m, the stop plate 5 can define the placement position of the steel pipe m, facilitating its positioning. After the steel pipe m is placed, the push rod device 4 can drive the stop plate 5 away from the cylindrical space, leaving space for the chuck 1.4, allowing the chuck 1.4 and support column 1.61 to jointly clamp the steel pipe m.

[0128] Furthermore, a detector can be installed to detect whether the steel pipe m is positioned in place. For example, a position sensor can be installed on the stop plate 5 to detect whether the steel pipe m is in contact with the stop plate 5.

[0129] The steel pipe size measuring device can also have a main unit module. When the chuck 1.4 is a pneumatic three-jaw chuck, the sliding component 1.2, the lifting component 1.3, the motor controlling the movement of the fixed seat 1.6, the laser sensor 3, the chuck 1.4 (a chuck with a pneumatic control structure), and the rotating device 1.5 are all electrically connected to the main unit module and controlled by the main unit module.

[0130] At this time, the steel pipe size measuring device can be used as shown in the attached figure. Figure 7 The work is as shown, specifically:

[0131] S1: Place the steel pipe m on the support 1.1 and make one end of the steel pipe m fit against the stop plate 5.

[0132] S2: The detector determines that the steel pipe m has been positioned and placed, and transmits a signal to the host module.

[0133] S3: The main module drives the sliding component 1.2 and the lifting component 1.3 to move according to the specific position and size of the steel pipe until they move to a position where the chuck 1.4 can clamp and fix one end of the steel pipe m. At this time, a sensor can be installed on the chuck 1.4 to connect with the steel pipe m. When the chuck 1.4 connects with the steel pipe m and can clamp it, the sensor transmits a clamping signal to the main module, and the main module controls the chuck 1.4 to clamp and fix one end of the steel pipe m.

[0134] At the same time, the main module also drives the motor that controls the movement of the fixed seat 1.6, causing the support column 1.61 to press against one end of the steel pipe m.

[0135] S4: After the steel pipe m is clamped and fixed, the host module controls the laser sensor 3 to turn on to measure the outer diameter, as shown by b1 and c1 in Example 1.

[0136] Furthermore, the value a1, as described above, represents the interval between the two laser sensors 3, which can be preset in the host module. Then, based on the obtained b1 and c1, adding a1, b1, and c1 yields the outer diameter of the steel pipe m in one radial direction. .

[0137] S5: Subsequently, by driving the chuck 1.4 to rotate, and thus driving the steel pipe m, the outer diameter values ​​of different radial directions of the same cross section of the steel pipe m can be measured. For example, each measurement cross section can detect a total of 16 points, that is, with a fixed rotation angle of 45°, a total of 8 measurements are taken.

[0138] S6: After the outer diameter values ​​of different radial directions of the same cross section of the steel pipe m are measured, the host module can further drive the laser frame 2 to move along the axial direction of the steel pipe m, so as to summarize the measurement of the outer diameter at different positions of the steel pipe m. At this time, a displacement sensor can be set to detect the movement of the laser frame 2 to obtain the axial displacement value of the laser frame 2, and to determine which part of the steel pipe m is to be detected in the axial direction.

[0139] S7: After the measurement is completed, the host module can drive the chuck 1.4 to release its grip on the steel pipe m, and drive the sliding component 1.2, lifting component 1.3, and fixed seat 1.6 away from the steel pipe m to unload and disassemble the steel pipe m.

[0140] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. Furthermore, the terms "vertical," "horizontal," "front," and "rear," etc., mentioned in the embodiments of the present invention 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 is in use. These are merely 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. It should be further noted that, unless otherwise explicitly specified and limited, terms such as "install," "connect," "join," and "fix" in the description should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0141] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for measuring the dimensions of large-diameter steel pipes, characterized in that, The method includes: S1: Position the steel pipe; S2: Divide the steel pipe along the first direction into: a central region portion, and a first-section portion and a second-section portion located on both sides of the central region; The first direction is a radial direction of the steel pipe; S3: Measure and determine the span value of the central region portion in the first direction to obtain a1; S4: Use a laser sensor to scan and measure the partition portion to obtain its maximum span value b1 in the first direction; S5: Use a laser sensor to scan and measure the two-part section to obtain its maximum span value c1 in the first direction; S6: Add a1, b1, and c1 together to obtain the outer diameter of the steel pipe in one radial direction. .

2. The method for measuring the dimensions of large-diameter steel pipes according to claim 1, characterized in that: Following S6, it also includes: S7: Rotate the steel pipe and reposition it, and repeat steps S2 to S6 to obtain the outer diameter of the steel pipe in another radial direction. ; S8: Repeat step S7 to obtain a total of n outer diameter dimensions of the steel pipe, which are as follows: , to ; S9: Process multiple outer diameter dimensions to obtain the average outer diameter value and ellipticity of the steel pipe; Among them, the average outer diameter value , ; Ellipticity , for , to The maximum value in, for , to The minimum value in.

3. The method for measuring the dimensions of large-diameter steel pipes according to claim 1, characterized in that: In S4, the laser sensor emits a laser to form a light curtain that is perpendicular to the axis of the steel pipe and the first direction; By placing the partition portion within the light curtain, the laser sensor measures and acquires the maximum span value b1 of the partition portion in the first direction.

4. The method for measuring the dimensions of large-diameter steel pipes according to claim 1, characterized in that: In S5, the laser sensor emits a laser to form a light curtain that is perpendicular to the axis of the steel pipe and the first direction; By placing the two-part section within the light curtain, the laser sensor measures and obtains the maximum span value c1 of the two-part section in the first direction.

5. A steel pipe size measuring device applicable to the large-diameter steel pipe size measuring method according to any one of claims 1 to 4, characterized in that, include: The support has a fixing structure for positioning the steel pipe, and the fixing structure has a cylindrical space for the steel pipe to be fitted and accommodated. A laser frame is connected to a laser sensor, which has two sensors and is spaced apart along a first straight line direction, which is configured as a radial direction of the cylindrical space. Wherein, in the first straight line direction, the interval between the two laser sensors is configured to be smaller than the maximum span value of the cylindrical space in the first straight line direction; Furthermore, each of the laser sensors is configured such that its laser emission direction is perpendicular to the first linear direction, and is used to measure the maximum projected size of the surface of the steel pipe in the first linear direction when the steel pipe is housed in the cylindrical space.

6. The steel pipe size measuring device according to claim 5, characterized in that: The retention structure includes: The support base is configured to provide bottom support for a horizontally placed steel pipe, and the upper end of which forms the cylindrical space. A sliding assembly positioned on one side of the cylindrical space has a sliding seat that moves axially within the cylindrical space; A lifting assembly connected to the sliding seat has a lifting seat that can move vertically. A chuck, which is connected to the lifting seat, is configured to: When a steel pipe is placed in the cylindrical space, one end of the steel pipe can be clamped to make the steel pipe in a locked state that cannot be moved, and the clamping of the steel pipe can also be released to make the steel pipe in an unlocked state that can be moved.

7. The steel pipe size measuring device according to claim 6, characterized in that: The upper end of the support base is provided with an upward-facing positioning groove. The positioning groove is configured to extend horizontally and have both ends connected in the horizontal direction to accommodate a horizontally extending steel pipe. The width of the positioning groove gradually decreases from top to bottom.

8. The steel pipe size measuring device according to claim 6, characterized in that: The chuck is rotatably connected to the lifting seat and is configured to rotate relative to the lifting seat, with its axis of rotation parallel to the axis of the cylindrical space. The chuck is connected to a rotating device that drives the chuck to rotate.

9. The steel pipe size measuring device according to claim 8, characterized in that: The retention structure further includes: A fixed seat is placed on the other side of the cylindrical space, and a support column is rotatably connected to it; The chuck, the support column, and the support base together form the cylindrical space. Furthermore, the support column is configured to rotate around the axis of the cylindrical space, and when a steel pipe is housed in the cylindrical space, it provides axial support to the other end of the steel pipe.

10. The steel pipe size measuring device according to claim 9, characterized in that: The bracket is equipped with a push rod device, which has a piston rod that can move up and down vertically; The piston rod is fixedly connected to a stop plate, which rises and falls synchronously with the piston rod and is configured to move to: Located between the chuck and the support column, so as to define a first position for the steel pipe placement space together with the support column; And, a second position located outside the cylindrical space.

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