Multi-source fusion dynamic diameter measuring device for super-large diameter spiral steel pipes

Abstract

The utility model discloses a kind of super-large diameter spiral steel pipe multi-source fusion dynamic diameter measuring device, belong to large-size workpiece geometry detection technical field, including datum positioning device, the datum positioning device includes first connecting ring, the inside of the first connecting ring is circumferentially equidistant and provided with a plurality of contact type displacement sensors, for the outer wall of pipe body resistance touch positioning, adjusting member is equipped on the first connecting ring for the synchronous adjustment of a plurality of contact type displacement sensors, to aim at the datum positioning of different diameter pipe body;The utility model not only can realize automatic measurement effect, greatly improve measurement efficiency, and also can correct the diameter value of pipe body, also play the effect of compensation, not easy to be interfered by temperature, measurement error is small, to greatly improve measurement precision, can also simultaneously carry out synchronous detection to the ellipticity of pipe body, need not manual multiple measurement, further improve measurement efficiency, it is also more simple, convenient to operate.

Description

Technical Field

[0001] This utility model belongs to the field of geometric measurement technology for large-size workpieces, and in particular relates to a multi-source fusion dynamic diameter measuring device for ultra-large diameter spiral steel pipes. Background Technology

[0002] Large-diameter spiral steel pipes generally refer to spiral steel pipes with a diameter greater than 1 meter. They are made by bending steel strips and then welding them. They are mainly used in water supply projects, petrochemical industry, chemical industry, power industry, agricultural irrigation and urban construction.

[0003] Currently, there are two main methods for measuring the diameter of large-diameter spiral welded steel pipes: contact measurement and non-contact measurement. Contact measurement relies mainly on manual measurement using a large measuring tape. However, this method is inefficient, requiring more than 5 minutes for a single-point measurement, and is greatly affected by human error, resulting in low measurement accuracy. Non-contact measurement mainly uses laser scanning, but this method is easily affected by oxide scale / weld reinforcement on the steel pipe surface, leading to measurement fluctuations of ±3mm. It is also susceptible to thermal deformation interference; since the temperature gradient of the pipe body after welding is generally between 80-200℃, thermal expansion errors are easily uncompensated. Furthermore, traditional measurement methods cannot simultaneously detect the ellipticity of the spiral welded steel pipe, requiring segmented measurements at multiple angles after machine shutdown, resulting in low measurement efficiency and cumbersome operation. Therefore, we propose a multi-source fusion dynamic diameter measuring device for ultra-large diameter spiral welded steel pipes to solve the aforementioned problems. Summary of the Invention

[0004] In view of this, in order to solve the problems that traditional measurement methods are not only inefficient and cumbersome to operate, but also easily affected by the oxide scale, weld reinforcement and thermal deformation on the steel pipe surface, which affect the measurement accuracy, and cannot simultaneously detect the ellipticity of the steel pipe, this utility model provides a multi-source fusion dynamic diameter measuring device for ultra-large diameter spiral steel pipes.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-source fusion dynamic diameter measuring device for ultra-large diameter spiral steel pipes, including a reference positioning device. The reference positioning device includes a first connecting ring. Multiple contact displacement sensors are circumferentially and equidistantly arranged on the inner side of the first connecting ring for contact positioning against the outer wall of the pipe. An adjusting component is provided on the first connecting ring for synchronous adjustment of the multiple contact displacement sensors to achieve reference positioning for pipes of different diameters.

[0006] It also includes a laser scanning device, which includes a second connecting ring. Multiple line laser profilers are arranged in a circumferential array on the inner side of the second connecting ring and are rotated by a driving component for array scanning of the outer wall of the tube.

[0007] It also includes an infrared thermal imager for real-time monitoring of the pipe wall temperature field, and the infrared thermal imager is equipped with a material expansion coefficient database.

[0008] It also includes a multi-source data fusion processor that calculates thermal expansion by temperature field partition and corrects the diameter value;

[0009] It also includes a dynamic temperature compensation model, which is set in the multi-source data fusion processor and calculates and compensates for the diameter compensation value according to the real-time temperature field distribution by zone.

[0010] Furthermore, the adjusting component includes a rotating ring rotatably connected to the outer wall of the first connecting ring. The inner wall of the rotating ring is rotatably connected with multiple connecting rods at equal intervals in a ring shape. The other end of each of the multiple connecting rods is rotatably connected to a connecting block. A contact displacement sensor is fixedly connected to the inner side of the connecting block. Guide rods are guided through the interior of each of the multiple connecting blocks. One end of the guide rod is fixedly connected to the inner wall of the first connecting ring.

[0011] Furthermore, the outer wall of the rotating ring is provided with teeth and engages with a rack, the rack being controlled to move by a cylinder.

[0012] Furthermore, an external toothed ring is fixedly sleeved on the outer wall of the second connecting ring, and a transmission gear is engaged therewith, the transmission gear being controlled to rotate by a drive motor.

[0013] Furthermore, the connecting block is made of carbon fiber.

[0014] Furthermore, the contact end of the contact displacement sensor is equipped with a pneumatically buffered ceramic probe with a diameter of 6mm, and the contact pressure between the ceramic probe and the pipe wall is controlled at 0.3-0.7N.

[0015] Furthermore, the number of contact displacement sensors is at least 12.

[0016] Furthermore, the number of line laser profilers is at least four.

[0017] The embodiments of this utility model have the following beneficial effects:

[0018] This invention utilizes a reference positioning device to clamp the entire device onto the tube, establishing a standard measurement reference surface. Operation is simple, and measurement accuracy is guaranteed. By employing a line laser profiler for automatic rotation and scanning of the tube, automated measurement is achieved, significantly improving efficiency. Simultaneously, an infrared thermal imager captures temperature distribution during measurement. A multi-source data fusion processor and a dynamic temperature compensation model are used to calculate thermal expansion and correct the tube diameter, providing compensation and minimizing temperature interference and measurement errors, thus greatly improving accuracy. Furthermore, the ellipticity of the tube can be simultaneously detected without manual, multiple measurements, further enhancing efficiency and simplifying operation.

[0019] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0021] Figure 1 This is a block diagram of the overall structure of the multi-source fusion dynamic diameter measuring device for ultra-large diameter spiral steel pipes of this utility model;

[0022] Figure 2 This is a schematic diagram of the reference positioning device;

[0023] Figure 3 This is a schematic diagram of the laser scanning device.

[0024] In the figure: 10, reference positioning device; 101, first connecting ring; 102, connecting block; 103, guide rod; 104, contact displacement sensor; 105, rotating ring; 106, connecting rod; 107, rack; 108, cylinder; 20, laser scanning device; 201, second connecting ring; 202, line laser profiler; 203, external gear ring; 204, transmission gear; 205, drive motor; 30, infrared thermal imager; 40, multi-source data fusion processor; 50, dynamic temperature compensation model. Detailed Implementation

[0025] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] Example 1: Please refer to Figures 1-3 This embodiment provides a multi-source fusion dynamic diameter measurement device for ultra-large diameter spiral steel pipes, including a reference positioning device 10, a laser scanning device 20, an infrared thermal imager 30, a multi-source data fusion processor 40, and a dynamic temperature compensation model 50. The reference positioning device 10 employs an adjustable annular carbon fiber frame with an adjustable diameter range of 4000-4500 mm. Twelve high-precision contact displacement sensors 104 are evenly distributed circumferentially on the inner side of the frame, with a measuring range of ±50 mm and a resolution of 0.01 mm. A pneumatically buffered ceramic probe is installed at the contact end of the contact displacement sensor 104. The ceramic probe is specifically a 6 mm diameter zirconia ceramic ball, and the contact pressure between it and the pipe wall is controlled at 0.3-0.7 N. By adjusting the annular carbon fiber frame to adapt to pipes of different sizes and pressing the ceramic probe of the contact displacement sensor 104 against the pipe wall, pneumatic clamping of the pipe is achieved, realizing reference positioning and establishing a measurement reference surface.

[0027] The laser scanning device 20 employs four line laser profilers 202 arranged in a 90° ring, forming an array. During installation, the spatial positional error between the line laser profilers 202 and the pneumatically buffered ceramic probe of the contact displacement sensor 104 is ≤0.1mm. The line laser profilers 202 scan at a frequency of 100Hz and rotate at 20r / min, simultaneously generating a contour point cloud of 10240 points / second. The line laser profilers 202 are equipped with an adaptive filter module to suppress interference from welding spatter and improve scanning accuracy. During scanning, the temperature distribution is simultaneously captured by an infrared thermal imager 30, and the pipe wall temperature field is monitored in real time with an accuracy controlled within ±2℃, where the highest temperature zone is 185℃ and the lowest temperature zone is 92℃.

[0028] In addition, a material expansion coefficient database is installed within the infrared thermal imager 30. Using a multi-source data fusion processor 40, the thermal expansion is calculated according to temperature field zones, and the diameter value is dynamically corrected according to a formula:

[0029] ΔD = α·D0·(T-T0)

[0030] Where α = 12 × 10⁻ 6 / ℃, T0=20℃ (reference temperature), taking 185℃ as an example, expansion compensation +8.24mm.

[0031] A dynamic temperature compensation model 50 is set up within the multi-source data fusion processor 40, and the diameter compensation value is calculated and compensated according to the real-time temperature field distribution by zone. The compensation formula is as follows:

[0032] D_corrected=D_measured / [1+α·(T_region-T_ref)]

[0033] Where α is the coefficient of linear expansion of the material, and T_ref=20℃.

[0034] In one aspect of this embodiment, during the diameter compensation process, the diameter range is calculated in real time using the formula Δd=max(dᵢ)-min(dᵢ), and a cross-sectional ellipticity cloud map is generated. The out-of-tolerance threshold is set to 0.3%D (≤12.66mm for Ф4220 pipe). The side diameter device proposed in this utility model is particularly suitable for online dynamic diameter measurement and ellipticity analysis of spiral welded pipes with a diameter ≥2 meters during the manufacturing process. This embodiment takes the online detection of a Ф4220×40mm spiral steel pipe as an example:

[0035] The output cold-state equivalent diameter is 4208.7mm, which conforms to GB / T 21835-2008 Class III tolerance;

[0036] Ellipticity analysis showed Δd=10.3mm, which is acceptable.

[0037] Compared to traditional measurement methods, the results are shown in the table below:

[0038] Performance indicators Traditional methods This utility model Single measurement time 300s 8s (fully automatic) absolute precision ±2.5mm ±0.8mm (including compensation) Ellipticity detection capability Manual measurement is required in 6 separate steps. Real-time full-week analysis Temperature interference suppression No compensation Dynamic correction error > 85%

[0039] As can be seen from the comparison in the table above, the reference positioning device 10 can position and clamp the entire device onto the tube, and establish a standard measurement reference surface. Operation is simple and measurement accuracy is guaranteed. By using a line laser profiler 202 to automatically rotate and scan the tube, automated measurement is achieved, greatly improving measurement efficiency. Simultaneously, during the measurement process, the infrared thermal imager 30 can capture the temperature distribution synchronously. The multi-source data fusion processor 40, in conjunction with the dynamic temperature compensation model 50, calculates the thermal expansion and corrects the tube diameter, providing compensation and minimizing temperature interference, resulting in small measurement errors and significantly improved measurement accuracy. Furthermore, the ellipticity of the tube can be simultaneously detected without manual, multiple measurements, further improving measurement efficiency and making operation simpler and more convenient.

[0040] This invention can be used in the field of multi-source fusion dynamic diameter measuring device for ultra-large diameter spiral steel pipes, and can also be applied to other fields of this invention.

[0041] Example 2: This example is a further improvement on the previous example: as follows Figures 1-3 As shown, the reference positioning device 10 includes a first connecting ring 101. A rotating ring 105 is rotatably connected to the outer wall of the first connecting ring 101. A plurality of connecting rods 106 are rotatably connected to the inner wall of the rotating ring 105 in an annular arrangement. The other end of each of the plurality of connecting rods 106 is rotatably connected to a connecting block 102. The connecting block 102 is made of carbon fiber. An annular carbon fiber frame is formed by the plurality of annularly arranged connecting blocks 102. A plurality of contact displacement sensors 104 are fixedly connected to the inner side of the corresponding connecting block 102, so as to achieve a circumferentially evenly distributed arrangement on the pipe wall.

[0042] In one aspect of this embodiment, guide rods 103 are guided through the interiors of multiple connecting blocks 102, with one end of each guide rod 103 fixedly connected to the inner wall of the first connecting ring 101. The outer wall of the rotating ring 105 is provided with teeth, on which a rack 107 meshes. The rack 107 is connected to the output end of a cylinder 108 and its movement is controlled by the cylinder 108. By activating the cylinder 108 to rotate the rack 107, the rotating ring 105 can be rotated through the meshing motion with the teeth. This allows the connecting blocks 102 to move and adjust on the guide rods 103 via the connecting rod 106, thereby adjusting the clamping diameter of the contact displacement sensor 104 to accommodate clamping and positioning of pipes of different diameters. Furthermore, the entire device is mounted on a frame, with the steel pipe passing between multiple contact displacement sensors 104 for pneumatic clamping and positioning. The frame can be movable or fixed; it can be a frame-moving measurement or a steel pipe-moving measurement. Specific measurement methods are not limited here. Both the first connecting ring 101 and the cylinder 108 are fixed to the frame.

[0043] In addition, the laser scanning device 20 includes a second connecting ring 201, and multiple line laser profilers 202 are arranged in a circumferential array inside the second connecting ring 201, with the line laser profilers 202 fixedly connected to the second connecting ring 201. An external toothed ring 203 is fixedly sleeved on the outer wall of the second connecting ring 201. Similarly, the second connecting ring 201 is rotatably connected to a frame, and a drive motor 205 is fixedly mounted on the frame. A transmission gear 204 is fixedly sleeved on the output shaft of the drive motor 205, and the transmission gear 204 meshes with the external toothed ring 203. By starting the drive motor 205 to drive the transmission gear 204 to rotate, the meshing motion with the external toothed ring 203 drives the second connecting ring 201 to rotate, thereby driving the four line laser profilers 202 to rotate, thus achieving the scanning and detection effect on the pipe wall.

[0044] However, as is well known to those skilled in the art, the working principles and wiring methods of cylinder 108, line laser profiler 202, drive motor 205 and infrared thermal imager 30 are commonplace and belong to conventional means or common knowledge. They will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A multi-source fusion dynamic diameter measuring device for ultra-large diameter spiral steel pipes, characterized in that, include: A reference positioning device (10) includes a first connecting ring (101). Multiple contact displacement sensors (104) are circumferentially and equidistantly arranged on the inner side of the first connecting ring (101) for contact positioning against the outer wall of the pipe. An adjusting member is provided on the first connecting ring (101) for synchronous adjustment of the multiple contact displacement sensors (104) to provide reference positioning for pipes of different diameters. The laser scanning device (20) includes a second connecting ring (201), and multiple line laser profilers (202) are arranged in a circumferential array on the inner side of the second connecting ring (201) and rotated by a driving component for array scanning of the outer wall of the tube. An infrared thermal imager (30) is used to monitor the temperature field of the pipe wall in real time. The infrared thermal imager (30) is equipped with a material expansion coefficient database. The multi-source data fusion processor (40) calculates the thermal expansion by temperature field partition and corrects the diameter value; The dynamic temperature compensation model (50) is set in the multi-source data fusion processor (40) and calculates the diameter compensation value according to the real-time temperature field distribution by partition and performs compensation.

2. The multi-source fusion dynamic diameter measuring device for ultra-large diameter spiral steel pipes as described in claim 1, characterized in that, The adjusting component includes a rotating ring (105) rotatably connected to the outer wall of the first connecting ring (101). The inner wall of the rotating ring (105) is circumferentially hinged with multiple connecting rods (106). The other end of each of the multiple connecting rods (106) is rotatably connected to a connecting block (102). A contact displacement sensor (104) is fixedly connected to the inner side of the connecting block (102). The interior of each of the multiple connecting blocks (102) is guided by a guide rod (103). One end of the guide rod (103) is fixedly connected to the inner wall of the first connecting ring (101).

3. The multi-source fusion dynamic diameter measuring device for ultra-large diameter spiral steel pipes as described in claim 2, characterized in that, The outer wall of the rotating ring (105) is provided with teeth and meshes with a rack (107), the rack (107) is controlled to move by a cylinder (108).

4. The multi-source fusion dynamic diameter measuring device for ultra-large diameter spiral steel pipes as described in claim 1 or 3, characterized in that, The outer wall of the second connecting ring (201) is fixedly fitted with an external toothed ring (203) and meshed with a transmission gear (204), the transmission gear (204) being controlled to rotate by a drive motor (205).

5. The multi-source fusion dynamic diameter measuring device for ultra-large diameter spiral steel pipes as described in claim 2, characterized in that, The connecting block (102) is made of carbon fiber.

6. The multi-source fusion dynamic diameter measuring device for ultra-large diameter spiral steel pipes as described in claim 5, characterized in that, The contact end of the contact displacement sensor (104) is equipped with a pneumatic buffer ceramic probe with a diameter of 6 mm and the contact pressure between the ceramic probe and the pipe wall is controlled at 0.3-0.7 N.

7. The multi-source fusion dynamic diameter measuring device for ultra-large diameter spiral steel pipes as described in claim 2, characterized in that, The number of contact displacement sensors (104) is at least 12.

8. The multi-source fusion dynamic diameter measuring device for ultra-large diameter spiral steel pipes as described in claim 1, characterized in that, The number of the line laser profilers (202) is at least four.

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