Steel pipe detection device and steel pipe detection method

Abstract

The invention discloses a steel pipe detection device and a steel pipe detection method, the steel pipe detection device comprises a transfer mechanism, a diameter detection mechanism and a plurality of straightness detection mechanisms, the two sides of the transfer mechanism are respectively provided with a plurality of straightness detection mechanisms, and the diameter detection mechanism is located at one side of the transfer mechanism; the straightness detection mechanism comprises an erecting assembly and first detection assemblies, the two first detection assemblies are arranged on one side of the erecting assembly, the extension directions of the two first detection assemblies are perpendicular, and each first detection assembly is provided with a telescopic first detection end; the diameter detection mechanism comprises a first support and a second detection assembly, the second detection assembly is installed on the first support, and the second detection assembly is provided with a second detection end capable of being clamped. By evaluating the geometric accuracy of the steel pipe, the situation that the unqualified steel pipe flows into the subsequent production process to cause shutdown and alarm of the production line is avoided, and the productivity of the production line is improved.

Description

Technical Field

[0001] This invention relates to the field of steel pipe testing technology, and in particular to a steel pipe testing device and a steel pipe testing method. Background Technology

[0002] In the manufacturing process of idler rollers, steel pipes are a key component, serving as the benchmark for subsequent processing and assembly at multiple stations. The straightness and diameter of the steel pipes are crucial factors in successfully producing low-resistance, low-noise idler rollers. However, in the current idler roller production process, raw steel pipes are directly transferred from the warehouse for manufacturing, lacking a process for checking the straightness and diameter of the raw steel pipes. Steel pipes with substandard straightness and diameter will affect the lifespan of subsequent equipment and the manufacturing precision of the idler rollers. If the steel pipes do not meet the requirements, it can easily cause equipment failures and production stoppages, as well as the production of a large number of idler rollers with substandard precision. Currently, defective products are usually rejected through subsequent equipment failure alarms and precision testing of the assembled idler rollers, which not only leads to low production line capacity but also easily results in resource waste. Summary of the Invention

[0003] The technical problem that this invention aims to solve is that: currently, defective steel pipes are usually rejected by subsequent equipment fault alarms and after assembly roller accuracy inspection, which not only leads to low production line capacity, but also easily causes resource waste.

[0004] To solve the above-mentioned technical problems, the present invention provides a steel pipe testing device, including a transfer mechanism, a diameter testing mechanism, and a straightness testing mechanism. Several straightness testing mechanisms are respectively arranged on both sides of the transfer mechanism, and the several straightness testing mechanisms on each side are spaced apart along the axial direction of the steel pipe. The diameter testing mechanism is located on one side of the transfer mechanism.

[0005] The straightness detection mechanism includes a mounting component and a first detection component. Two first detection components are disposed on one side of the mounting component, and the extension directions of the two first detection components are perpendicular. The first detection component has a retractable first detection end, which can be compressed as the steel pipe is squeezed.

[0006] The diameter detection mechanism includes a first support and a second detection component. The second detection component is mounted on the first support and has a clamping second detection end. The clamping width of the second detection end can be adjusted according to the size of the steel pipe.

[0007] Furthermore, the first detection component includes a detection sensor, an elastic element, a pressure block, a first mounting base, and a guide rod. The first mounting base is installed on one side of the mounting component, the guide rod is installed on the first mounting base, the pressure block is slidably installed on one end of the guide rod, the elastic element is sleeved on the periphery of the guide rod, and both ends of the elastic element abut against the pressure block and the first mounting base respectively. The sensing end of the detection sensor is connected to the pressure block so that when the pressure block is pressed down, the sensing end of the detection sensor is compressed along with the pressure block.

[0008] Furthermore, the straightness detection mechanism also includes a lifting assembly, which includes a lifting plate, a first driving member, and a first slide rail. The first driving member and the first slide rail are mounted on the mounting assembly. The first slide rail extends vertically. The lifting plate is slidably mounted on the first slide rail, and the first driving member is connected to the lifting plate. Two first detection components are mounted on one side of the lifting plate.

[0009] Furthermore, the mounting assembly includes a second support and a support roller, the support roller being rotatably mounted on the second support, and the first drive member and the first slide rail being mounted on one side of the second support.

[0010] Furthermore, the second detection component includes a clamping arm, a second driving member, and a displacement sensor. The second driving member is mounted on the first support and connected to the clamping arm to drive the two clamping arms to move relative to or away from each other to adjust the clamping width. The displacement sensor is connected to the clamping arm to detect the clamping width of the clamping arm.

[0011] Furthermore, the diameter detection mechanism also includes a rotating shaft, a sliding plate, a second slide rail, and a third driving component. The second slide rail and the third driving component are mounted on the first support, the sliding plate is slidably mounted on the second slide rail, the rotating shaft is mounted on the sliding plate, and the second detection component is mounted on the rotating shaft.

[0012] Furthermore, the transfer mechanism includes a guide rail base, a second mounting base, a fourth driving member, a V-shaped bracket, and a fifth driving member. The second mounting base is slidably mounted on the guide rail base, and the fourth driving member is connected to the second mounting base. The two V-shaped brackets are arranged opposite to each other at both ends of the second mounting base and are located on the side of the second mounting base away from the guide rail base. Both V-shaped brackets are vertically mounted on the second mounting base through the corresponding fifth driving member. Several straightness detection mechanisms are respectively arranged on both sides of the guide rail base, and the diameter detection mechanism is located on one side of the guide rail base.

[0013] The present invention also provides a steel pipe testing method, applied to the steel pipe testing device described above, the steel pipe testing method comprising the following steps:

[0014] The steel pipe is placed on the erection assembly, the first detection assembly is compressed, and the second detection assembly clamps the steel pipe;

[0015] The first compression value of each of the first detection components in the first direction, the second compression value of each of the first detection components in the second direction, and the displacement of the second detection end are obtained, wherein the first direction and the second direction are set perpendicular to each other.

[0016] A first error value in a first direction is obtained based on a plurality of first compression values, a second error value in a second direction is obtained based on a plurality of second compression values, and the actual straightness error of the steel pipe is calculated based on the first error value and the second error value.

[0017] The diameter of the steel pipe is calculated based on the displacement.

[0018] Further, a first error value in a first direction is derived based on a plurality of first compression values, a second error value in a second direction is derived based on a plurality of second compression values, and the actual straightness error of the steel pipe is calculated based on the first error value and the second error value, including:

[0019] Along the axial direction of the steel pipe, three different first compression values ​​of the first detection components are obtained sequentially, and the three first compression values ​​are defined as the first measurement group value. The three first compression values ​​are respectively the first measurement value of the first detection component in the first order, the second measurement value of the first detection component in the second order, and the third measurement value of the first detection component in the third order.

[0020] The first measured value and the third measured value are fitted into a straight line, and the first deviation between the second measured value and the straight line is calculated. This deviation is the first error value in the first direction, and the first error values ​​of multiple first measured group values ​​are obtained in sequence.

[0021] The above steps are followed to sequentially obtain multiple second error values ​​in the second direction;

[0022] The straightness error of the steel pipe is calculated using the following formula:

[0023]

[0024] Wherein, δ is the straightness error of the steel pipe, δx is the first error value, and δy is the second error value;

[0025] Compare multiple straightness errors and take the maximum value as the actual straightness error of the steel pipe.

[0026] Furthermore, calculating the diameter of the steel pipe based on the displacement includes:

[0027] Obtain the initial width value of the second detection component and the displacement of the clamping arm;

[0028] The initial width value is subtracted from the displacement to obtain the diameter value of the steel pipe.

[0029] The present invention provides a steel pipe testing device and method, which, compared with the prior art, have the following advantages:

[0030] This invention employs a multi-point, bidirectional detection method to detect the straightness of steel pipes, ensuring that the straightness of steel pipes entering subsequent processes meets requirements. Simultaneously, an adjustable clamping structure is used for diameter detection, ensuring that the steel pipe diameter meets requirements and preventing dimensional deviations from affecting connections or assembly. By assessing the geometric accuracy of the steel pipes, unqualified steel pipes are prevented from flowing into subsequent production processes, thus avoiding production line shutdowns and alarms, improving production line capacity, and preventing resource waste. Attached Figure Description

[0031] The present application will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present application. Furthermore, unless specifically indicated, the drawings are intended only to conceptually represent the composition or structure of the described objects and may contain exaggerated representations, and the drawings are not necessarily drawn to scale.

[0032] Figure 1 This is a structural schematic diagram of the steel pipe testing device provided in an embodiment of the present invention from a first angle;

[0033] Figure 2 This is a structural schematic diagram of the steel pipe testing device provided in an embodiment of the present invention from a second angle;

[0034] Figure 3 This is a side view of the steel pipe testing device provided in an embodiment of the present invention;

[0035] Figure 4 This is a side view of the straightness detection mechanism provided in an embodiment of the present invention;

[0036] Figure 5 This is provided by the embodiments of the present invention. Figure 1 A magnified view of part A circled in the diagram;

[0037] Figure 6This is a side view of the diameter detection mechanism provided in an embodiment of the present invention;

[0038] Figure 7 This is provided by the embodiments of the present invention. Figure 1 A magnified view of part B circled in the diagram;

[0039] Figure 8 This is provided by the embodiments of the present invention. Figure 1 A magnified view of part C circled in the diagram;

[0040] In the diagram, 1. Transfer mechanism; 11. Guide rail base; 12. Second mounting base; 13. Fourth driving component; 14. V-shaped bracket; 15. Fifth driving component; 2. Diameter detection mechanism; 21. First support; 22. Second detection component; 221. Clamping arm; 222. Second driving component; 223. Displacement sensor; 23. Rotating shaft; 24. Slide plate; 25. Second slide rail; 3. Straightness detection mechanism; 31. Erection component; 311. Second support; 312. Support roller; 32. First detection component; 321. Detection sensor; 322. Elastic component; 323. Pressure block; 324. First mounting base; 325. Guide rod; 33. Lifting component; 331. Lifting plate; 332. First driving component; 333. First slide rail; 4. Steel pipe. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0042] like Figures 1 to 4 , Figure 7 As shown, the present invention provides a steel pipe testing device, including a transfer mechanism 1, a diameter testing mechanism 2, and a straightness testing mechanism 3. The transfer mechanism 1 is used to transport and support the steel pipe 4 to be tested, so that it can be transported smoothly to the testing area. Several straightness testing mechanisms 3 are respectively arranged on both sides of the transfer mechanism 1, and the several straightness testing mechanisms 3 on each side are spaced apart along the axial direction of the steel pipe 4 to test the straightness of multiple sections along the entire length of the steel pipe 4. The diameter testing mechanism 2 is located on one side of the transfer mechanism 1.

[0043] The straightness testing mechanism 3 includes a support assembly 31 and a first testing assembly 32. The support assembly 31 is used to place the steel pipe 4. Two first testing assemblies 32 are arranged on one side of the support assembly 31, and the extension directions of the two first testing assemblies 32 are perpendicular to each other, so as to detect the curvature of the steel pipe 4 from two orthogonal directions. The first testing assembly 32 has a retractable first testing end, which can be compressed as the steel pipe 4 is squeezed. When the steel pipe 4 is placed on the support assembly 31, it will squeeze the first testing end, causing the first testing end to undergo compression displacement.

[0044] The diameter detection mechanism 2 includes a first support 21 and a second detection component 22. The second detection component 22 is mounted on the first support 21 and has a clamping second detection end. The second detection end can clamp the steel pipe 4, and the clamping width of the second detection end can be adjusted according to the size of the steel pipe 4 so as to detect the diameter of the steel pipe 4 through the clamping width.

[0045] Based on the above structure, in this embodiment, the steel pipe 4 is placed on the transfer mechanism 1 and transported to the detection position. Then, the steel pipe 4 is placed on the support assembly 31. Since the second detection assembly 22 and multiple support assemblies 31 are all located on the same axis, the steel pipe 4 is also supported on the second detection assembly 22. When the steel pipe 4 is placed on the support assembly 31, the first detection ends of multiple first detection assemblies 32 distributed on both sides and at multiple axial positions contact the surface of the steel pipe 4. The first detection ends of the first detection assemblies 32 are compressed by the steel pipe 4, resulting in compression displacement. By measuring the difference in compression at multiple positions (axial) and two directions (radial), the bending condition of the steel pipe 4 at different cross-sections is calculated, thereby determining its overall straightness. Simultaneously, at a fixed position, the second detection end of the diameter detection mechanism 2 clamps the steel pipe 4 and measures its diameter to determine whether the diameter of the steel pipe 4 is qualified.

[0046] This embodiment employs a multi-point, bidirectional detection method to achieve straightness detection of steel pipe 4, ensuring that the straightness of steel pipe 4 entering subsequent processes meets the requirements. At the same time, an adjustable clamping structure is used for diameter detection to ensure that the diameter of steel pipe 4 meets the requirements, avoiding the impact of dimensional deviations on connection or assembly. By evaluating the geometric accuracy of steel pipe 4, unqualified steel pipe 4 is prevented from flowing into subsequent production processes, thus avoiding production line shutdown alarms, improving production line capacity, and avoiding resource waste.

[0047] Understandably, in this embodiment, the first detection ends of the multiple first detection components 32 can all be in contact with the surface of the steel pipe 4. When the degree of bending at a certain point is too large, the first detection end of a certain first detection component 32 at that point may not be in contact with the surface of the steel pipe 4, and this is not particularly limited here. In this embodiment, it is sufficient to ensure that at least three first detection ends of the first detection components 32 in the same detection direction are in contact with the surface of the steel pipe 4.

[0048] Preferably, the straightness detection mechanism 3 of this embodiment has four sets, and the four sets of straightness detection mechanisms 3 are symmetrically arranged in pairs on both sides of the transfer mechanism 1. The diameter detection mechanism 2 is arranged between the two straightness detection mechanisms 3 located on the same side. A support base is provided below both the diameter detection mechanism 2 and the straightness detection mechanism 3.

[0049] like Figure 4 and Figure 5 As shown, the first detection component 32 includes a detection sensor 321, an elastic element 322, a pressure block 323, a first mounting base 324, and a guide rod 325. The first mounting base 324 is installed on one side of the mounting component 31, and the guide rod 325 is installed on the first mounting base 324. The pressure block 323 is a component that directly contacts the steel pipe 4 and is slidably installed on one end of the guide rod 325 so that it can move along the direction of the guide rod 325. For example, it can withstand the compression and downward displacement of the steel pipe 4 or return to its original position. The elastic element 322 is sleeved around the guide rod 325, and the two ends of the elastic element 322 abut against the pressure block 323 and the first mounting base 324 respectively to provide a restoring force so that the pressure block 323 can automatically return to its original position when no external force is applied; at the same time, it buffers the impact of the steel pipe 4 on the first detection end and protects the detection sensor 321. The sensing end of the detection sensor 321 is connected to the pressure block 323 so that when the pressure block 323 is pressed down, the sensing end of the detection sensor 321 is compressed along with the pressure block 323.

[0050] Based on the above structure, when the steel pipe 4 presses against the pressure block 323, it moves downward along the guide rod 325. As the pressure block 323 presses down, it compresses the elastic element 322, simultaneously pushing the sensing end of the detection sensor 321 downward. The detection sensor 321 senses the displacement (compression amount) of the sensing end and outputs a corresponding electrical signal (such as voltage or current value). After the steel pipe 4 leaves, the elastic element 322 returns to its original state, pushing the pressure block 323 back to its initial position, ready for the next detection. In this embodiment, the detection sensor 321 can be a piston displacement sensor 223, with the sensing end being a connecting rod. This embodiment converts the radial positional displacement of the steel pipe 4 caused by bending into a measurable mechanical compression amount, which is then converted into an electrical signal by the sensor for the control system to analyze the straightness of the steel pipe 4. Two first detection components 32 are arranged vertically to detect the displacement in two directions respectively, comprehensively judging the straightness.

[0051] Understandably, the pressure block 323 and the sensing end in this embodiment constitute the first detection end.

[0052] Furthermore, the straightness detection mechanism 3 also includes a lifting assembly 33, which includes a lifting plate 331, a first drive member 332, and a first slide rail 333. The first drive member 332 and the first slide rail 333 are installed on the mounting assembly 31. The first slide rail 333 extends vertically to ensure the straightness and stability of the lifting movement and to avoid uneven loading or swaying affecting the detection accuracy. The lifting plate 331 is slidably installed on the first slide rail 333, and the first drive member 332 is connected to the lifting plate 331. Two first detection components 32 are installed on one side of the lifting plate 331 so that they can rise and fall together with the lifting plate 331, so that the initial height of the first detection components 32 can be adjusted by raising and lowering.

[0053] Based on the above structure, before the steel pipe 4 is placed in the inspection station, the pressure block 323 of the first inspection component 32 is raised to a position higher than the pre-placed position of the steel pipe 4 by the first driving component 332. After the steel pipe 4 is placed in position, its surface contacts the pressure block 323, and the pressure block 323 is compressed, causing the pressure block 323 to generate a displacement (compression). By measuring the compression at multiple points, the degree of bending or straightness error of the steel pipe 4 can be calculated. In this embodiment, the first driving component 332 is a motor or a cylinder.

[0054] Furthermore, the erection assembly 31 includes a second support 311 and a support roller 312. The support roller 312 is rotatably mounted on the second support 311 to support the steel pipe 4 and bear its weight. A first drive member 332 and a first slide rail 333 are mounted on one side of the second support 311 for placing the steel pipe 4. In this embodiment, the support roller 312 is a V-shaped wheel.

[0055] like Figure 6 and Figure 7 As shown, the second detection component 22 includes a clamping arm 221, a second driving member 222, and a displacement sensor 223. The second driving member 222 is mounted on the first support 21 and is connected to the clamping arm 221 to drive the two clamping arms 221 to move relative to or away from each other to adjust the clamping width and realize the clamping measurement of the steel pipe 4. The displacement sensor 223 is connected to the clamping arm 221 to detect the displacement of the clamping arm 221.

[0056] Based on the above structure, when the second detection component 22 is in its initial state, the clamping arms 221 are in an open state, waiting for the steel pipe 4 to enter the detection position. At the start of the detection, the steel pipe 4 is transported to the diameter detection station by the transfer mechanism 1. The second drive component 222 is activated, driving the two clamping arms 221 to move inwards relative to each other, gradually approaching and gently clamping the outer wall of the steel pipe 4. At this time, the displacement sensor 223 records the displacement of the clamping arms 221 in real time. After the measurement is completed, the second drive component 222 reverses its movement, causing the clamping arms 221 to move in opposite directions, releasing the steel pipe 4.

[0057] Understandably, in this embodiment, the displacement sensor 223 is a piston sensor, and the second drive member 222 is connected to a clamping arm 221. The clamping arm 221 is connected to the connecting rod of the displacement sensor 223. The movement of the clamping arm 221 drives the extension and retraction of the connecting rod, thereby measuring the displacement. In this embodiment, the diameter of the steel pipe 4 is calculated using the initial width value and the displacement, achieving automatic measurement of the diameter of the steel pipe 4 and improving the level of production automation. In this embodiment, the second drive member 222 is a cylinder.

[0058] It should be noted that the clamping arm 221 and the displacement sensor 223 in this embodiment constitute the second detection end.

[0059] Furthermore, the diameter detection mechanism 2 also includes a rotating shaft 23, a sliding plate 24, a second slide rail 25, and a third drive component. The second slide rail 25 and the third drive component are mounted on the first support 21. The sliding plate 24 is slidably mounted on the second slide rail 25. The rotating shaft 23 is mounted on the sliding plate 24. The second detection component 22 is mounted on the rotating shaft 23.

[0060] When the steel pipe 4 is fed into the detection area, the second detection component 22 needs to contact or approach the surface of the steel pipe 4 for measurement. In this embodiment, the third driving component can push the slide plate 24 to move along the second slide rail 25 and rotate the shaft 23, making the second detection component 22 coaxial with the steel pipe 4. This achieves floating self-adaptation of the second detection component 22, ensuring that the second detection component 22 is always coaxial with the surface of the steel pipe 4, reducing measurement errors caused by positional deviations. The second detection component 22 in this embodiment can adapt to steel pipes 4 of different specifications, positions, and even slight deformations, improving the versatility of the equipment. The third driving component in this embodiment is a cylinder.

[0061] like Figure 8 As shown, the transfer mechanism 1 includes a guide rail base 11, a second mounting base 12, a fourth driving component 13, a V-shaped bracket 14, and a fifth driving component 15. The second mounting base 12 is slidably mounted on the guide rail base 11, and the fourth driving component 13 is connected to the second mounting base 12. Two V-shaped brackets 14 are arranged opposite to each other at both ends of the second mounting base 12 and are located on the side of the second mounting base 12 away from the guide rail base 11 to support and position the steel pipe 4 and ensure its stability during transportation. Both V-shaped brackets 14 are mounted on the second mounting base 12 in a height-adjustable manner through the corresponding fifth driving component 15 to adjust the height of the V-shaped brackets 14 and realize the loading or unloading action of the steel pipe 4. Several straightness detection mechanisms 3 are respectively arranged on both sides of the guide rail base 11, and the diameter detection mechanism 2 is located on one side of the guide rail base 11.

[0062] Based on the above structure, when the steel pipe 4 is placed on the V-shaped bracket 14, the fourth drive component 13 is activated, driving the second mounting base 12 to slide along the guide rail base 11 to the designated position. Subsequently, the fifth drive component 15 drives the V-shaped bracket 14 to descend, placing the steel pipe 4 on the erection assembly 31 for inspection. After the inspection is completed, the fifth drive component 15 drives the V-shaped bracket 14 to rise, lifting the inspected steel pipe 4, thus realizing automatic loading and unloading of the steel pipe 4. In this embodiment, the fourth drive component 13 and the fifth drive component 15 are cylinders.

[0063] The present invention also provides a steel pipe testing method, applied to the steel pipe testing device described above, the steel pipe testing method comprising the following steps:

[0064] S110. Place the steel pipe 4 on the erection assembly 31, compress the first detection assembly 32, and clamp the steel pipe 4 with the second detection assembly 22.

[0065] This step involves positioning the steel pipe 4 when it is placed on the support assembly 31, causing it to compress the first detection assembly 32 located below, and having the second detection assembly 22 clamp the steel pipe 4 from both sides to measure its width, thereby measuring the relevant data of the steel pipe 4.

[0066] S120: Obtain the first compression value of each first detection component 32 in the first direction, the second compression value of each first detection component 32 in the second direction, and the displacement of the second detection end; the first direction and the second direction are set perpendicular to each other.

[0067] This step collects the compression values ​​of the first detection components 32 in the first and second directions respectively, obtains the deformation response data of the steel pipe 4 in different directions, and uses it to analyze its curvature. At the same time, it records the displacement of the steel pipe 4 when the second detection component 22 clamps it, which serves as the basis for calculating the diameter.

[0068] S130. Based on multiple first compression values, the first error value in the first direction is obtained; based on multiple second compression values, the second error value in the second direction is obtained; based on the first error value and the second error value, the actual straightness error of the steel pipe 4 is calculated.

[0069] This step utilizes the compression values ​​of multiple first detection ends in the first direction to fit the bending profile of the steel pipe 4 in that direction, and then calculates the deviation relative to the ideal straight line; similarly, the bending deviation in the second direction is obtained, and by combining the deviations in the two perpendicular directions, the actual straightness error of the steel pipe 4 in three-dimensional space is obtained, thereby realizing the evaluation of the overall straightness of the steel pipe 4.

[0070] S140. Calculate the diameter of steel pipe 4 based on the displacement.

[0071] Based on the above method, this embodiment achieves quantitative analysis of the degree of bending of steel pipe 4 in two perpendicular directions through multi-point compression data acquisition, thereby calculating the straightness error of steel pipe 4, which is more accurate than traditional manual visual inspection or single-direction measurement. It can also simultaneously measure the diameter of steel pipe 4, improving inspection efficiency.

[0072] Furthermore, a first error value in the first direction is obtained based on multiple first compression values, and a second error value in the second direction is obtained based on multiple second compression values. The actual straightness error of the steel pipe 4 is calculated based on the first error value and the second error value, including:

[0073] S131. Along the axial direction of the steel pipe 4, the first compression values ​​of three different first detection components 32 are obtained in sequence, and the three first compression values ​​are defined as the first measurement group value. The three first compression values ​​are the first measurement value of the first detection component 32 in the first order, the second measurement value of the first detection component 32 in the second order, and the third measurement value of the first detection component 32 in the third order.

[0074] In this step, two first detection components 32 are installed on the same cross-section of the steel pipe 4, and three consecutive first detection components 32 (first priority, second priority and third priority) are selected in sequence along the axial direction of the steel pipe 4 to obtain the deformation data of the steel pipe 4 in a certain axial section, record their compression values ​​to form a first measurement group value, and use it as the basic information of local bending trend for subsequent analysis.

[0075] This embodiment has four straightness detection mechanisms 3. When detecting in the first direction, they are sequentially designated as first, second, third, and fourth along the axis of the steel pipe 4. That is, this embodiment has two sets of first measurement values: the first measurement value of the first detection component 32 in the first position, the second measurement value of the first detection component 32 in the second position, the third measurement value of the first detection component 32 in the third position, and the fourth measurement value of the first detection component 32 in the fourth position. Multiple straightness detection mechanisms 3 can be set as needed. Similarly, multiple sets of first measurement values ​​can be obtained based on the number of straightness detection mechanisms 3, and so on.

[0076] S132. Fit the first measurement value and the third measurement value into a straight line, and calculate the deviation between the second measurement value and the straight line. This deviation is the first error value in the first direction, and the first error values ​​of multiple first measurement groups are obtained in sequence.

[0077] Understandably, assuming the steel pipe 4 is ideally straight, then the three points should be on a straight line. This step uses the first measurement value of the first detection component 32 and the third measurement value of the third detection component 32 to fit an ideal straight line (i.e., the expected shape). Then, the deviation of the second measurement value of the middle detection component 32 from this ideal straight line is used as the first error value. In this embodiment, multiple first error values ​​are obtained by repeating the operation on multiple sets of first measurement values ​​to determine whether the steel pipe 4 is bent in the first direction. The larger the deviation of the middle point, the more bent the segment.

[0078] Multiple second error values ​​in the second direction are obtained sequentially according to the above steps;

[0079] S133. Similarly, the deviation in the second direction is obtained through the above steps and defined as the second error value. This step determines whether the steel pipe 4 is bent in the second direction by obtaining multiple second error values.

[0080] S134. Calculate the straightness error of steel pipe 4 according to the following formula:

[0081]

[0082] Where δ is the straightness error of steel pipe 4, δx is the first error value, and δy is the second error value;

[0083] This step combines the errors in the two directions into a total error value, reflecting the true degree of bending of the steel pipe 4.

[0084] S135. Compare multiple straightness errors and take the maximum value as the actual straightness error of steel pipe 4.

[0085] Understandably, there will be multiple sets of data along the axis of steel pipe 4, so multiple δ values ​​will be calculated (each representing the comprehensive error of a segment). Finally, the largest δ value is selected as the straightness error of the entire steel pipe 4 to ensure the strictness of quality control.

[0086] Furthermore, the diameter value of steel pipe 4 is calculated based on the displacement, including:

[0087] S141. Obtain the initial width value of the second detection component 22 and the displacement of the clamping arm 221;

[0088] The initial width value in this step refers to the original distance between the two clamping arms 221 when the steel pipe 4 is not clamped (i.e., the width in the unloaded or open state).

[0089] S142. Subtract the displacement from the initial width value to obtain the diameter value of steel pipe 4.

[0090] If the initial width (unloaded) is 100mm, and the displacement of the clamping arm 221 after clamping the steel pipe 4 is 16mm, then the diameter of the steel pipe 4 = 100mm - 16mm = 84mm, indicating that the diameter of the steel pipe 4 is 84mm.

[0091] In summary, the embodiments of the present invention provide a steel pipe inspection device and a steel pipe inspection method. The device employs multi-point, bidirectional inspection to detect the straightness of the steel pipe 4, ensuring that the straightness of the steel pipe 4 entering subsequent processes meets requirements. Simultaneously, an adjustable clamping structure is used for diameter inspection, ensuring that the diameter of the steel pipe 4 meets requirements and preventing dimensional deviations from affecting connection or assembly. By evaluating the geometric accuracy of the steel pipe 4, unqualified steel pipes 4 are prevented from flowing into subsequent production processes, thus avoiding production line shutdown alarms, improving production line capacity, and preventing resource waste.

[0092] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A steel pipe inspection device characterized by comprising: The diameter detection mechanism and the straightness detection mechanism are arranged on both sides of the moving mechanism, and the straightness detection mechanisms on each side are arranged along the axis direction of the steel pipe. The straightness detection mechanism comprises a supporting assembly and a first detection assembly, two first detection assemblies are arranged on one side of the supporting assembly, and the extension directions of the two first detection assemblies are arranged perpendicularly. The diameter detection mechanism comprises a first support and a second detection assembly, the second detection assembly is installed on the first support, and the second detection assembly has a clamping second detection end, and the second detection end can adjust the clamping width according to the size of the steel pipe.

2. The steel pipe inspection apparatus according to claim 1, characterized by The first detection assembly comprises a detection sensor, an elastic member, a pressing block, a first mounting seat and a guide rod, the first mounting seat is installed on one side of the supporting assembly, the guide rod is installed on the first mounting seat, the pressing block is slidingly installed on one end of the guide rod, the elastic member is sleeved on the circumferential side of the guide rod, and the two ends of the elastic member are respectively in abutment with the pressing block and the first mounting seat, and the sensing end of the detection sensor is connected with the pressing block, so that when the pressing block is pressed down, the sensing end of the detection sensor is compressed with the pressing block.

3. The steel pipe inspection apparatus according to claim 1 or 2, characterized by The straightness detection mechanism further comprises a jacking assembly, the jacking assembly comprises a jacking plate, a first driving member and a first sliding rail, the first driving member and the first sliding rail are installed on the supporting assembly, the first sliding rail is arranged in the vertical direction, the jacking plate is slidingly installed on the first sliding rail, the first driving member is connected with the jacking plate, and two first detection assemblies are installed on one side of the jacking plate.

4. The steel pipe inspection apparatus according to claim 3, characterized by The supporting assembly comprises a second support and a supporting roller, the supporting roller is rotatably installed on the second support, the first driving member and the first sliding rail are installed on one side of the second support.

5. The steel pipe inspection apparatus according to claim 1, characterized by The second detection assembly comprises a clamping arm, a second driving member and a displacement sensor, the second driving member is installed on the first support, and the second driving member is connected with the clamping arm to drive the two clamping arms to move oppositely or away from each other to adjust the clamping width, and the displacement sensor is connected with the clamping arm to detect the clamping width of the clamping arm.

6. The steel pipe inspection apparatus according to claim 1 or 5, characterized by The diameter detection mechanism further comprises a rotating shaft, a sliding plate, a second sliding rail and a third driving member, the second sliding rail and the third driving member are installed on the first support, the sliding plate is slidingly installed on the second sliding rail, the rotating shaft is installed on the sliding plate, and the second detection assembly is installed on the rotating shaft.

7. The steel pipe inspection apparatus according to claim 1, wherein The transfer mechanism comprises a guide rail base, a second mounting seat, a fourth driving member, V-shaped brackets and fifth driving members, the second mounting seat is slidably mounted on the guide rail base, the fourth driving member is connected with the second mounting seat, two V-shaped brackets are oppositely arranged at two ends of the second mounting seat and located on a side of the second mounting seat away from the guide rail base, the two V-shaped brackets are both liftably mounted on the second mounting seat through corresponding fifth driving members, a plurality of straightness detection mechanisms are arranged on both sides of the guide rail base, and the straightness detection mechanisms are located on one side of the guide rail base.

8. A method of inspecting a steel pipe, characterized by, The steel pipe detection method is applied to the steel pipe detection device as claimed in any one of claims 1-7, and comprises the following steps: Placing a steel pipe on the erecting assembly, compressing the first detection assembly, and clamping the steel pipe by the second detection assembly; Obtaining a first compression value of each first detection assembly in a first direction, a second compression value of each first detection assembly in a second direction, and a displacement amount of the second detection end, the first direction being perpendicular to the second direction; Deriving a first error value in the first direction according to a plurality of first compression values, deriving a second error value in the second direction according to a plurality of second compression values, and calculating an actual straightness error of the steel pipe according to the first error value and the second error value; Calculating a diameter value of the steel pipe according to the displacement amount.

9. The steel pipe inspection method according to claim 8, characterized by Deriving a first error value in the first direction according to a plurality of first compression values, deriving a second error value in the second direction according to a plurality of second compression values, and calculating an actual straightness error of the steel pipe according to the first error value and the second error value comprises: Obtaining first compression values of different three first detection assemblies in sequence along an axial direction of the steel pipe, and defining the three first compression values as a first measurement group value, the three first compression values being a first measurement value of a first-order first detection assembly, a second measurement value of a second-order first detection assembly, and a third measurement value of a third-order first detection assembly respectively; Fitting the first measurement value and the third measurement value as a straight line, and calculating a deviation of the second measurement value from the straight line, the deviation being a first error value in the first direction, and sequentially obtaining first error values of a plurality of first measurement group values; Sequentially obtaining a plurality of second error values in the second direction according to the above steps; Calculating a straightness error of the steel pipe according to the following formula: Wherein, δ is the straightness error of the steel pipe, δx is the first error value, and δy is the second error value; Comparing a plurality of straightness errors, and taking a maximum value as an actual straightness error of the steel pipe.

10. The steel pipe inspection method according to claim 8, characterized by Calculating a diameter value of the steel pipe according to the displacement amount comprises: Obtaining an initial width value of the second detection assembly and a displacement amount of the clamping arm; Subtracting the displacement amount from the initial width value to obtain a diameter value of the steel pipe.

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