Acid-corrosion-resistant low-carbon seamless steel tube thickness measuring device

Abstract

The invention provides an acid-corrosion-resistant low-carbon seamless steel pipe thickness measuring device, and particularly relates to the technical field of steel pipe thickness metering, the acid-corrosion-resistant low-carbon seamless steel pipe thickness measuring device comprises a middle-position laser head and at least one side-position laser head, the middle-position laser head and the side-position laser head are used for detecting the wall thickness of a plurality of to-be-measured pipes arranged in groups, and a motion platform is arranged outside a laser thickness measuring assembly; according to the thickness measuring device for the acid-corrosion-resistant low-carbon seamless steel pipe, the laser thickness measuring assembly is driven by the motion platform to move in the arrangement direction, the axial direction and the vertical direction of the steel pipe; the problems that in the prior art, a feeding separation mechanism needs to be additionally arranged, and feeding time is long and equipment cost is high due to the fact that steel pipes are conveyed one by one are solved, it is achieved that the bundled steel pipes can be detected in place, additional operation such as separation and single feeding of the steel pipes is not needed, feeding time and equipment input cost are greatly reduced, and the production efficiency is improved. And meanwhile, stable basic positioning support is provided for batch detection, and the detection flexibility and adaptability are improved.

Description

Technical Field

[0001] This invention provides a thickness measuring device for acid-resistant low-carbon seamless steel pipes, specifically relating to the field of steel pipe thickness measurement technology. Background Technology

[0002] Acid-resistant low-carbon seamless steel pipes are widely used in chemical, petroleum, and municipal industries. The uniformity of their wall thickness directly determines their safety and service life. Therefore, after production, strict wall thickness measurement and testing are required to ensure that the products meet the factory standards. Currently, after the acid-resistant low-carbon seamless steel pipes are produced, they are usually bundled, stacked, and transported to the testing area. The wall thickness of the steel pipes is then accurately measured and tested by the testing equipment. Only after passing the test can they be put into storage and shipped. The entire testing process needs to balance testing accuracy and efficiency to meet the needs of large-scale production.

[0003] In the prior art, such as the patent with patent publication number CN217877550U and title "An Automatic Inspection Device for Seamless Steel Pipes", a device for inspecting steel pipes using a laser probe is disclosed. Its core is to transport steel pipes one by one to the inspection station through a feeding and conveying mechanism to realize the automated measurement and inspection of the outer diameter and wall thickness of the steel pipes. While this technology can achieve automatic inspection of steel pipes, it has significant drawbacks: First, it adopts a single-pipe inspection mode, while acid-resistant low-carbon seamless steel pipes are mostly transported in bundles after production. This device requires an additional dedicated feeding and separation mechanism to separate the bundled steel pipes one by one before transporting them individually, which not only increases equipment investment costs but also consumes a lot of time in the steel pipe separation and individual feeding stages. Second, the single-pipe inspection method is extremely inefficient and cannot meet the needs of batch wall thickness measurement of bundled steel pipes, making it difficult to meet the requirements of efficient inspection in large-scale production. In addition, the inspection structure of this device cannot adapt to the stacking posture of bundled steel pipes, requiring each steel pipe to be individually positioned before wall thickness measurement and inspection can be completed, further increasing the complexity of the inspection process, extending the inspection cycle, and failing to solve the industry pain point of batch and rapid wall thickness measurement of bundled steel pipes.

[0004] Therefore, this invention proposes a thickness measuring device for acid-resistant low-carbon seamless steel pipes to compensate for and improve the deficiencies of existing technologies. Summary of the Invention

[0005] In view of the deficiencies of the existing technology, the present invention provides a thickness measuring device for acid-resistant low-carbon seamless steel pipes, which can effectively solve the related technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention discloses a thickness measuring device for acid-resistant low-carbon seamless steel pipes, including a laser thickness measuring component. The laser thickness measuring component includes a central laser head and at least one side laser head, used to measure the wall thickness of several steel pipes arranged in a group. The laser thickness measurement component is externally equipped with a motion platform, and the laser thickness measurement component is installed on the moving end of the motion platform. The moving end of the motion platform drives the laser thickness measurement component to perform linear reciprocating motion along the X / Y / Z axes, thereby realizing the switching of different detection points. A detection station is set in front of the laser thickness measuring component and on the X-axis of the motion platform. Bundles of steel pipes are positioned at the detection station in a stacked manner. The center laser head extends into the center of the gap formed by several adjacent steel pipes, and the side laser head extends into the internal channel of the steel pipe. It also includes a laser fine-tuning module, which is located between the moving end of the motion platform and the laser thickness measuring component. It includes a floating cross arm structure, on which the laser thickness measuring component is mounted. The laser thickness measuring component is used to elastically float along the X-axis and Y-axis during the detection process to adapt to the stacking posture deviation of the steel pipes. A triangular block is provided between the center laser head and the floating cross arm structure. Telescopic blocks are installed on the three sides of the triangular block. A rotating ball is fitted at the telescopic end of the telescopic block. An air pipe is fixedly connected to the inside of the telescopic block. The air pipe is connected to an external gas supply module. The telescopic block is driven to extend and retract by gas pressure, and the rotating ball is used to achieve centering and guidance.

[0007] Compared with known prior art, the technical solution provided by this invention has at least one of the following beneficial effects: This acid-resistant, corrosion-resistant, low-carbon seamless steel pipe thickness measuring device uses a motion platform to drive the laser thickness measuring component to move along the steel pipe arrangement direction, axial direction, and vertical direction. It solves the problems of long feeding time and high equipment cost caused by the need to set up an additional feeding and separation mechanism and transport steel pipes one by one in the existing technology. It realizes that the bundled steel pipes can be tested as soon as they arrive, without the need for additional operations such as separating steel pipes and feeding them one by one. This greatly reduces the feeding time and equipment investment cost, while providing stable basic positioning support for batch testing and improving the flexibility and adaptability of testing.

[0008] By cooperating with the first elastic element, the second elastic element, the first limiting frame, the second limiting frame, and the slider, the laser thickness measuring component can achieve elastic floating in the cross direction. This solves the problem that the rigid positioning of the motion platform cannot compensate for the small posture deviation of the steel pipe, realizes real-time flexible adaptation in the detection process, ensures that the laser head is always in the optimal detection position, and improves the detection accuracy and stability.

[0009] By using an air tube to drive the telescopic block to extend and retract, the rotating ball adaptively abuts against the inner wall of the steel pipe, solving the problem of the center laser head being misaligned and unable to accurately align with the center of the gap. This achieves automatic centering and alignment before inspection. Combined with the floating cross arm structure, it further eliminates the impact of steel pipe stacking deviation on inspection and ensures the consistency of the inspection benchmark.

[0010] By using the three-way split laser beam of the center laser head and the synchronous detection of three side laser heads, the efficiency bottleneck of existing technologies, which can only detect a single steel pipe in one movement, is solved. This enables the simultaneous measurement of the wall thickness of three adjacent steel pipes after one movement and positioning, greatly improving the detection efficiency of grouped steel pipes and meeting the high-efficiency detection needs of large-scale production.

[0011] By driving the gear disc to rotate through the drive source, and using the cooperation of curved grooves and straight grooves to drive the side laser head to extend and retract radially synchronously, the problem of the detection device being unable to adapt to steel pipes of different diameters is solved. The automatic and precise adjustment of the distance between the side laser head and the center laser head is realized, improving the device's versatility for steel pipes of different specifications.

[0012] By using multi-stage electric telescopic rods or nested telescopic sleeves, the axial extension and retraction of the center laser head and the side laser head are realized, which solves the limitation of existing devices that can only detect steel pipes of fixed length. It enables full-length detection of steel pipes of different lengths and specifications, thus expanding the applicability of the device.

[0013] By linking the multi-stage electrically controlled telescopic section with the rotating sphere and floating cross arm structure, the problem of ordinary telescopic structures being unable to compensate for the steel pipe's posture deviation during the telescopic process is solved. This achieves the synchronization of axial telescopic movement and real-time posture adjustment, ensuring that the laser head always maintains the optimal detection posture during the telescopic process and improving the reliability of the detection. Attached Figure Description

[0014] Figure 1 This is a front-view perspective structural diagram of the present invention; Figure 2 This is a three-dimensional structural view of the main structure of the present invention from another angle; Figure 3 This is a three-dimensional structural diagram of the motion platform components in this invention; Figure 4 This is a three-dimensional structural diagram of the motion platform and laser thickness measurement component in Embodiment 1 of the present invention; Figure 5 This is a three-dimensional structural diagram of the motion platform and laser thickness measurement component in the disassembled state according to Embodiment 1 of the present invention; Figure 6 This is a three-dimensional structural diagram of the mid-position laser head in this invention; Figure 7 This is a partial planar structural diagram showing the positional relationship between the laser thickness measuring component and the tube under test in Embodiment 1 of the present invention; Figure 8 This is a three-dimensional structural diagram of the motion platform and laser thickness measurement component in Embodiment 2 of the present invention; Figure 9 This is a partial planar structural diagram showing the positional relationship between the laser thickness measuring component and the tube under test in Embodiment 2 of the present invention; Figure 10 This is a partial three-dimensional structural diagram of the laser thickness measurement component in Embodiment 3 of the present invention; Figure 11 This is a three-dimensional structural diagram of the laser thickness measurement component in its disassembled state according to Embodiment 3 of the present invention; Figure 12 This is a planar structural diagram of the movement path of the side-positioned laser head in Embodiment 3 of the present invention; Figure 13 This is a three-dimensional structural diagram of the laser thickness measurement component and related components of the telescopic section in Embodiment 4 of the present invention; Figure 14 This is a partial three-dimensional structural diagram showing the positional relationship between the telescopic section and the tube under test in Embodiment 4 of the present invention; Figure 15 This is a partial three-dimensional structural diagram of the positional relationship between the telescopic section and the tube under test in Embodiment 4 of the present invention from another angle.

[0015] The labels in the diagram represent: 1. Sports platform; 2. Laser thickness measurement assembly; 21. Center laser head; 211. Triangular block; 212. Telescopic block; 213. Rotating sphere; 214. Air tube; 22. Side laser head; 23. Telescopic section; 3. Test tube; 4. Laser fine-tuning module; 41. First limiting frame; 42. Second limiting frame; 43. First elastic element; 44. Slider; 45. Second elastic element; 46. Mounting plate; 461. Linear groove; 462. Drive source; 463. Drive gear; 47. Gear plate; 471. Curved groove. Detailed Implementation

[0016] The present invention will be further described below with reference to embodiments.

[0017] Example 1: like Figures 1-4 as well as Figure 6As shown, a thickness measuring device for acid-resistant low-carbon seamless steel pipes includes a laser thickness measuring component 2. The laser thickness measuring component 2 includes a central laser head 21 and at least one side laser head 22, used to measure the wall thickness of several pipes 3 arranged in a group. Specifically, the number of side laser heads 22 is set to three. A motion platform 1 is configured outside the laser thickness measuring component 2, and the laser thickness measuring component 2 is installed on the moving end of the motion platform 1. The moving end of the motion platform 1 drives the laser thickness measuring component 2 to perform linear reciprocating motion along the X / Y / Z axes to achieve switching between different detection points. A detection station is set in front of the laser thickness measuring component 2 and in the X-axis direction of the motion platform 1. The bundled pipes 3 are positioned at the detection station in a stacked manner. The central laser head 21 extends into the center of the gap formed by several adjacent pipes 3, and the side laser head 22 extends into the internal channel of the pipe 3. Further implementation includes a laser fine-tuning module 4, located between the moving end of the motion platform 1 and the laser thickness measuring component 2. The laser thickness measuring component 2 is mounted on the floating cross arm structure, allowing it to elastically float in the X and Y axes during the detection process to accommodate the stacking posture deviation of the tube 3 under test. A triangular block 211 is provided between the center laser head 21 and the floating cross arm structure. Telescopic blocks 212 are installed on each of the three circumferences of the triangular block 211. A rotating ball 213 is mounted on the telescopic end of the telescopic block 212. An air pipe 214 is fixedly connected to the inner part of the telescopic block 212 and is connected to an external gas supply module. Gas pressure drives the telescopic block 212 to extend and retract, cooperating with the rotating ball 213 to achieve centering guidance.

[0018] It should be noted that, as Figure 4 As shown, the floating cross arm structure includes: a first limiting frame 41, a second limiting frame 42, a first elastic element 43, a slider 44, a second elastic element 45, and a mounting plate 46; the first limiting frame 41 is fixedly connected to the moving end of the motion platform 1, and it is arranged in a cross shape with the second limiting frame 42, and the second limiting frame 42 can slide along the length direction of the first limiting frame 41; the slider 44 is slidably assembled in the second limiting frame 42 and can slide along the length direction of the second limiting frame 42; there are two sets of first elastic elements 43, which are respectively arranged on the upper and lower sides of the first limiting frame 41 and the second limiting frame 42; there are two sets of second elastic elements 45, which are respectively arranged on the left and right sides of the slider 44 and the second limiting frame 42; the mounting plate 46 is fixedly connected to the slider 44, and the center laser head 21 and the side laser head 22 are both mounted on the mounting plate 46, so that the laser thickness measuring component 2 can float elastically in both directions of the cross.

[0019] Specifically, the floating cross arm structure is used to achieve small-range adaptive fine-tuning of the laser thickness measurement component 2. The motion platform 1 is mainly used to achieve large-range, high-precision movement and positioning of the detection position. It has high motion accuracy and large stroke, but poor response flexibility. It cannot compensate for the small posture deviations and position offsets of the tube under test 3 caused by stacking and processing errors in real time. However, this structure, through the elastic floating of the first elastic element 43 and the second elastic element 45 in the two directions of the cross intersection, can passively, flexibly and in real time adapt to the small position deviations and posture errors of the tube under test 3 during the detection process. This ensures that the center laser head 21 and the side laser head 22 are always kept in the optimal detection position, avoiding detection errors or structural interference caused by rigid positioning. Thus, without affecting the overall positioning accuracy of the motion platform 1, the stability and accuracy of the detection are greatly improved.

[0020] It should be added that the motion platform 1 is specifically: the existing three-axis (X / Y / Z) linear module platform, which can drive the laser thickness measurement component 2 to move in a wide range of directions along the arrangement direction, axial direction and vertical direction of the tube to be tested 3, so as to realize the detection switching of different detection stations and different batches of tubes to be tested 3, and provide stable basic positioning support for the overall detection. The bundled tubes to be tested 3 are positioned at the testing station using a special positioning frame; The detection principle of the laser thickness measurement component 2 is as follows: the center laser head 21 emits laser towards the outer wall of the tube to be measured 3, and the side laser head 22 extends into the inside of the tube to be measured 3 and emits laser towards the inner wall of the tube to be measured 3. By receiving the laser signals reflected from the outer wall and the inner wall respectively, the distance information between the outer wall and the inner wall is obtained, and then the wall thickness data of the tube to be measured 3 is calculated, so as to realize non-contact accurate thickness measurement and avoid damage to the surface of the tube to be measured 3 caused by contact detection. In addition, there are two sets of first elastic elements 43. The first elastic element 43 located below the first limiting frame 41 and the second limiting frame 42 has a greater elastic force than the first elastic element 43 located above. This is because the first elastic element 43 located below, in addition to providing elastic preload and realizing floating fine adjustment, also needs to bear the overall weight of the laser thickness measuring component 2, the mounting plate 46 and the slider 44, to ensure that the laser thickness measuring component 2 remains horizontal in its natural state, avoid detection deviation caused by gravity offset, and further improve the stability and detection accuracy of floating fine adjustment.

[0021] The complete working principle of the above embodiment one is as follows: During operation, the bundled tubes 3 to be tested are first positioned at the testing station using a positioning frame to ensure that the tubes 3 to be tested are stacked neatly side by side, providing a basic positioning for subsequent testing.

[0022] The equipment is then started, and the motion platform 1 moves the laser thickness measuring component 2 as a whole, achieving a wide range and high precision detection position switching until the laser thickness measuring component 2 is moved to the target detection area, so that the center laser head 21 extends into the center of the gap formed by the three adjacent tubes to be tested 3, while the side laser head 22 extends into the internal channel of the tube to be tested 3, completing the positioning before detection.

[0023] During this process, due to slight posture deviations in the stacking of the tubes under test 3 and minor processing errors, the rigid positioning of the motion platform 1 cannot compensate for such slight deviations. At this time, the floating cross arm structure of the laser fine-tuning module 4 and the rotating ball 213 on the triangular block 211 cooperate to play a fine-tuning role: under the drive of the external gas supply module, the telescopic block 212 is supplied with gas of the same pressure through the air pipe 214, which pushes each rotating ball 213 to extend synchronously; when one side of the rotating ball 213 first touches the inner wall of the tube under test 3, the rotating balls 213 on the other side have not yet touched the tube under test 3. Since the internal air pressure of each telescopic block 212 is consistent, the uneven force will cause the triangular block 211 to produce adaptive offset, which will drive the center laser head 21 to perform posture fine-tuning. Meanwhile, in the floating cross arm structure, the second limiting frame 42 slides along the first limiting frame 41, and the slider 44 slides along the second limiting frame 42. With the elastic cooperation of the upper and lower sets of first elastic elements 43 and the left and right sets of second elastic elements 45, the whole structure floats as it follows the fine adjustment of the triangular block 211. The lower first elastic element 43 has a greater elastic force to balance the overall gravity and ensure that the laser thickness measuring component 2 is always horizontal and stable. Through this adaptive adjustment process, the center laser head 21 and the side laser head 22 can be quickly aligned with the best detection position, eliminating the influence of small deviations of the tube to be tested 3 in real time, avoiding detection errors, and improving detection stability and accuracy.

[0024] After positioning is completed, the laser thickness measurement component 2 starts to work. The center laser head 21 emits laser towards the outer wall of the tube to be measured 3, and the side laser head 22 emits laser towards the inner wall of the tube to be measured 3. By receiving the laser signals reflected by the two and calculating the distance difference, the wall thickness data of the tube to be measured 3 is accurately obtained.

[0025] After completing the inspection of a single group of tubes 3, the motion platform 1 moves the laser thickness measuring component 2 to the next inspection station, repeating the above process to achieve continuous and accurate inspection of the group of tubes 3.

[0026] Example 2: like Figure 8 and Figure 9As shown, there are three side laser heads 22, which extend into the internal channels of three adjacent tubes 3 to be tested. The center laser head 21 can emit lasers in three directions at the same time. The laser emitted in each direction cooperates with the corresponding side laser head 22, so that the laser thickness measuring component 2 can complete the wall thickness detection of three adjacent tubes 3 at the same time after one movement.

[0027] It should be added that the center laser head 21 is a three-directional laser emission structure, which integrates a laser beam splitter, which can split a single laser source into three independent laser beams. The three laser beams are emitted at a uniform angle toward the three adjacent tubes under test 3, and the emission direction of each laser beam corresponds to and is coaxially aligned with the detection direction of the side laser head 22 on the corresponding side. During testing, the three laser beams emitted by the center laser head 21 are directed toward the outer walls of three adjacent tubes 3 under test. Simultaneously, three side laser heads 22 extend into the internal channels of their respective tubes 3 under test and emit laser beams toward the inner walls of the tubes 3 under test. Each pair of corresponding center laser heads 21 and side laser heads 22 receive the signals reflected from the outer and inner walls of the tubes 3 under test, respectively. By calculating the difference in the propagation distances of the laser beams on the outer and inner walls of the same tube 3 under test, the wall thickness data of that tube 3 under test is accurately obtained. The three laser beams work synchronously and do not interfere with each other. With the synchronous detection of the three side laser heads 22, the wall thickness detection of three adjacent tubes 3 under test can be completed synchronously after the laser thickness measurement component 2 moves and positions once. This greatly improves the detection efficiency of the group of tubes 3 under test, while ensuring that the detection accuracy of each tube 3 under test is consistent with that of a single tube.

[0028] The complete working principle of the above embodiment two is as follows: During operation, the overall preparation, positioning, and fine-tuning process is consistent with that in Example 1. First, the bundled tubes to be tested 3 are positioned at the testing station using the positioning frame. Then, the motion platform 1 is started, which drives the laser thickness measuring component 2 to move over a wide range, so that the center laser head 21 extends into the center of the gap formed by the three adjacent tubes to be tested 3, and the three side laser heads 22 respectively extend into the internal channels of the three adjacent tubes to be tested 3. At the same time, through the cooperation of the telescopic block 212 on the triangular block 211, the rotating ball 213, and the floating cross arm structure, a small posture fine-tuning is completed to ensure accurate testing position.

[0029] The core difference from Embodiment 1 lies in the fact that the center laser head 21 is a three-directional laser emission structure, which integrates a laser beam splitter to split a single laser source into three independent laser beams. The three laser beams are emitted at a uniform angle, and each laser beam is coaxially aligned with the detection direction of the corresponding side laser head 22. During detection, the three laser beams emitted by the center laser head 21 are simultaneously emitted toward the outer wall of the three adjacent test tubes 3, and the three side laser heads 22 are simultaneously emitted toward the inner wall of the corresponding test tube 3. Each pair of corresponding laser beams receives the reflected signals from the outer and inner walls of the same test tube 3, and the wall thickness data of a single test tube 3 is obtained by calculating the distance difference. The three laser beams work synchronously and do not interfere with each other. With the synchronous detection of the three side laser heads 22, the wall thickness detection of the three adjacent test tubes 3 can be completed synchronously after the laser thickness measurement component 2 moves and positions once, greatly improving the detection efficiency of the group of test tubes 3. The remaining processes, such as station switching after detection, are consistent with Embodiment 1.

[0030] It should be noted that the fine-tuning structure formed by the rotating ball 213 and the floating cross arm in this embodiment not only improves the detection accuracy and positioning stability of a single tube 3 under test, but also ensures that all three sets of laser detection units can enter the optimal detection posture synchronously during the simultaneous detection of three tubes 3 under test. Since there may be slight relative offset, coaxiality deviation or tube diameter difference when the three adjacent tubes 3 under test are stacked, if only the rigid positioning of the motion platform 1 is relied upon, it is very easy for some side laser heads 22 to be accurately aligned, while other side laser heads 22 deviate from the ideal detection position, which will lead to inconsistent or even invalid detection data of the three channels. By using the telescopic block 212 to push the rotating ball 213 to adaptively abut, and in conjunction with the elastic floating of the floating cross arm, the center laser head 21 and the three side laser heads 22 can be flexibly aligned as a whole. This allows the three sets of detection units to simultaneously, synchronously, and with the same precision fit the corresponding inner and outer wall detection positions of the tube to be tested 3. This ensures that the three wall thickness data are collected under the same reference, which not only guarantees the detection accuracy of a single tube, but also achieves consistency and reliability when the three tubes to be tested 3 are detected synchronously, truly giving full play to the high efficiency advantage of multi-station synchronous detection.

[0031] Example 3: like Figure 10 As shown, a synchronous telescopic moving module is installed between the mounting plate 46 and the laser thickness measuring component 2. The side laser head 22 is slidably mounted on the surface of the mounting plate 46, and the triangular block 211 is fixedly connected to the surface of the mounting plate 46. The synchronous telescopic moving module drives the side laser head 22 to slide along the surface of the mounting plate 46, thereby realizing the adjustment of the distance between the side laser head 22 and the center laser head 21.

[0032] like Figure 11As shown, the synchronous telescopic moving module includes a toothed disk 47, which passes through the mounting disk 46 and is hinged to the surface of the slider 44. The toothed disk 47 can rotate around its own axis. The surface of the toothed disk 47 is provided with a curved groove 471, and the surface of the mounting disk 46 is provided with a straight groove 461. The number of straight grooves 461 and curved grooves 471 are adapted to the number of side laser heads 22, and the side laser heads 22 are correspondingly inserted through the curved grooves 471 and slide in cooperation with the straight grooves 461.

[0033] like Figure 11 As shown, the synchronous telescopic movement module also includes a drive source 462, which is located on the outside of the mounting plate 46. A fixing plate extends outward from the surface of the slider 44, and the drive source 462 is fixedly connected to the fixing plate. A drive gear 463 is fixedly mounted on the output shaft of the drive source 462, and the drive gear 463 meshes with the gear plate 47.

[0034] like Figure 12 As shown, the curved groove 471 is arc-shaped, with one end close to the center of the toothed disk 47 and the other end far from the center of the toothed disk 47. The curved groove 471 cooperates with the side laser head 22 to drive the side laser head 22 to move radially and synchronously along the straight groove 461.

[0035] It should be added that the drive source 462 is specifically a stepper motor or a servo motor to achieve precise angle control and start / stop positioning, thereby ensuring that the moving distance of the side laser head 22 is accurate and controllable. At the same time, the device is equipped with a control system, which can pre-input the specifications such as the diameter and wall thickness of the tube 3 to be tested. The control system automatically calculates and outputs the corresponding control commands to the drive source 462 based on the input parameters. After receiving the command, the drive source 462 rotates at the set angle, and drives the gear disk 47 to rotate through the drive gear 463, thereby realizing the automatic adjustment of the radial spacing of the side laser head 22 without manual adjustment.

[0036] The complete working principle of the above embodiment three is as follows: Before testing, the staff input the specifications such as the diameter and wall thickness of the tube to be tested 3 in advance through the control system of the device. The control system automatically calculates the required matching distance between the side laser head 22 and the center laser head 21 based on the input parameters, and generates the corresponding control command, which is sent to the drive source 462.

[0037] After receiving the control command, the drive source 462 rotates at the set precise angle, and the drive gear 463 fixedly installed on its output shaft rotates synchronously. Since the drive gear 463 meshes with the gear disk 47, it drives the gear disk 47 to rotate smoothly around its own axis.

[0038] The gear disk 47 passes through the mounting disk 46 and is hinged to the surface of the slider 44. The number of curved grooves 471 on its surface and the number of straight grooves 461 on the surface of the mounting disk 46 are adapted to the three side laser heads 22. The side laser heads 22 are correspondingly inserted through the curved grooves 471 and slide in cooperation with the straight grooves 461. Therefore, when the gear disk 47 rotates, the curved grooves 471 generate radial thrust on the side laser heads 22 through the arc trajectory. Under the limiting and guiding action of the straight grooves 461, the three side laser heads 22 move radially and equidistantly along the surface of the mounting disk 46 until the spacing is adjusted to be compatible with the specifications of the tube 3 to be tested.

[0039] After the spacing adjustment is completed, the drive source 462 stops working and locks its position to prevent the side laser head 22 from shifting during the detection process.

[0040] Then the laser thickness measurement component 2 is activated. The three laser beams split by the center laser head 21 are emitted synchronously toward the outer wall of the three adjacent tubes to be measured 3. The three side laser heads 22 are inserted into the corresponding tubes to be measured 3 and emit lasers toward the inner wall. The wall thickness data of each tube to be measured 3 is obtained by receiving the reflected signal and calculating the distance difference.

[0041] After the inspection is completed, the motion platform 1 moves the laser thickness measuring component 2 to the next inspection station. If different specifications of tubes to be tested 3 need to be tested, the above parameter input, automatic spacing adjustment and inspection process are repeated. No manual adjustment is required, which greatly improves the versatility, automation and inspection efficiency of the device.

[0042] Example 4: like Figures 13 to 15 As shown, the side laser head 22 has a rod-shaped structure on the side near the mounting plate 46; both the rod-shaped structure of the side laser head 22 and the triangular block 211 are provided with telescopic sections 23. The telescopic sections 23 are electrically controlled telescopic structures, and the telescopic movement of the center laser head 21 and the side laser head 22 is realized through the telescopic sections 23.

[0043] It should be noted that the telescopic section 23 is a multi-stage electrically controlled telescopic structure. Through multi-stage telescopic cooperation, the telescopic stroke of the center laser head 21 and the side laser head 22 is expanded to adapt to the testing requirements of tubes 3 of different lengths.

[0044] It should be added that the telescopic structure of the multi-stage electrically controlled telescopic section 23 includes, but is not limited to, multi-stage electric telescopic rods and multi-stage nested telescopic sleeves. It integrates a telescopic drive motor and a stroke limit sensor, which can realize the sequential telescopic extension of multiple sections, effectively expanding the telescopic stroke and meeting the full-length detection requirements of tubes 3 of different lengths. The control system of the device is electrically connected to the drive motor of the telescopic section 23. The operator can pre-input the length parameters of the tube 3 to be tested through the control system. The control system automatically calculates and outputs telescopic control commands based on the input parameters, accurately controlling the telescopic length and speed of the telescopic section 23. At the same time, the stroke limit sensor can provide real-time feedback of the telescopic position signal to avoid excessive extension and contraction, which could cause collision damage between the side laser head 22, the center laser head 21 and the inner wall of the tube 3 to be tested, ensuring accurate and safe telescopic action.

[0045] The complete working principle of the above embodiment four is as follows: During operation, the process of positioning the tube to be tested 3, moving the laser thickness measuring component 2 to its position driven by the motion platform 1, and completing the adaptive fine-tuning of the floating cross arm structure and the rotating ball 213 is consistent with the aforementioned embodiment.

[0046] Based on Example 3, Example 4 adds a telescopic section 23 to achieve adaptive adjustment of the axial length direction: Before testing, the operator inputs the length parameter of the tube to be tested 3 through the control system. The control system drives the multi-stage electrically controlled telescopic section 23 to move. The telescopic section 23 adopts a multi-stage electric telescopic rod or a multi-stage nested telescopic sleeve structure. With the cooperation of the internal drive motor and the stroke limit sensor, the synchronous extension and retraction of the center laser head 21 and the side laser head 22 are realized, accurately matching the axial length of the tube to be tested 3.

[0047] During the testing process, the telescopic section 23 can drive the laser head to move along the length of the tube 3 under test, thereby achieving continuous wall thickness detection over the entire length.

[0048] The advantage of this telescopic structure is that it can adapt to acid-resistant, corrosion-resistant, low-carbon, seamless test tubes 3 of different lengths and specifications, which solves the limitation of traditional testing devices that can only adapt to steel pipes of fixed lengths. The multi-stage telescopic form has a large stroke, good rigidity after extension, stable positioning and high accuracy. Combined with radial spacing adjustment and floating centering fine adjustment, it can truly realize full-specification adaptive testing of test tubes 3 of different diameters, wall thicknesses and lengths, which greatly improves the applicability and testing versatility of the device. Secondly, compared with existing ordinary telescopic structures, the multi-stage electrically controlled telescopic section 23 of this device, in conjunction with the centering structure of the rotating sphere 213 and the fine-tuning structure of the floating cross arm in the aforementioned embodiment, forms a unique adaptive telescopic detection system with significant advantages. Ordinary telescopic structures can only achieve simple axial telescopic expansion and contraction. During the telescopic process, they cannot adapt to the stacking deviation and posture shift of the tube under test 3, and are prone to interference or alignment shift between the laser head and the inner wall of the tube under test 3. Moreover, they can only be used with a single detection structure, limiting the applicable scenarios. In contrast, the telescopic section 23 of this device, while achieving multi-stage axial telescopic expansion and adapting to the full-length detection of tubes under test 3 of different lengths, can adjust the posture of the laser thickness measuring component 2 in real time during the telescopic process by relying on the adaptive contact of the rotating sphere 213 and the elastic fine-tuning of the floating cross arm, automatically compensating for the slight shift of the tube under test 3. This "telescopic + real-time attitude adjustment" linkage design solves the pain point of the disconnect between telescopic and positioning in ordinary telescopic structures. Combined with the radial adjustment of the synchronous telescopic moving module, it can achieve full-dimensional adaptation of the length and diameter of the tube under test without manual intervention, greatly improving the convenience of testing and the flexibility of adaptation, far exceeding the single telescopic function of ordinary telescopic structures.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A thickness measuring device for acid-resistant low-carbon seamless steel pipes, comprising a laser thickness measuring component (2), the laser thickness measuring component (2) comprising a central laser head (21) and at least one lateral laser head (22), the two working together to measure the wall thickness of a group of pipes (3) to be measured, characterized in that, The laser thickness measuring component (2) is externally configured with a motion platform (1), and the laser thickness measuring component (2) is installed on the moving end of the motion platform (1). The moving end of the motion platform (1) drives the laser thickness measuring component (2) to perform linear reciprocating motion along the X / Y / Z axis, thereby realizing the switching of different detection points. A detection station is set in front of the laser thickness measuring component (2) and in the X-axis direction of the motion platform (1). Bundles of tubes to be tested (3) are positioned at the detection station in a stacked manner. The center laser head (21) extends into the center of the gap formed by several adjacent tubes to be tested (3), and the side laser head (22) extends into the interior of the tubes to be tested (3). It also includes a laser fine-tuning module (4), which is located between the moving end of the motion platform (1) and the laser thickness measuring component (2). It includes a floating cross arm structure, and the laser thickness measuring component (2) is mounted on the floating cross arm structure. The laser thickness measuring component (2) is used to elastically float in the X-axis and Y-axis directions during the detection process to adapt to the stacking posture deviation of the tube to be tested (3). A triangular block (211) is provided between the mid-position laser head (21) and the floating cross arm structure. Telescopic blocks (212) are installed on the three sides of the triangular block (211). A rotating ball (213) is assembled at the telescopic end of the telescopic block (212). An air pipe (214) is fixedly connected to the inside of the telescopic block (212). The air pipe (214) is connected to the external gas supply module. The telescopic block (212) is driven to extend and retract by the gas pressure, and the centering and guidance are achieved in conjunction with the rotating ball (213).

2. The thickness measuring device for acid-resistant low-carbon seamless steel pipes according to claim 1, characterized in that, The floating cross arm structure includes: a first limiting frame (41), a second limiting frame (42), a first elastic element (43), a slider (44), a second elastic element (45), and a mounting plate (46). The first limiting frame (41) is fixedly connected to the moving end of the motion platform (1), and it is arranged in a cross shape with the second limiting frame (42). The second limiting frame (42) can slide along the length direction of the first limiting frame (41). The slider (44) is slidably assembled in the second limiting frame (42) and can slide along the length direction of the second limiting frame (42). The first elastic element (43) consists of two sets, which are respectively arranged on the upper and lower sides of the first limiting frame (41) and the second limiting frame (42); The second elastic element (45) consists of two sets, which are respectively arranged on the left and right sides of the slider (44) and the second limiting frame (42); The mounting plate (46) is fixedly connected to the slider (44). The center laser head (21) and the side laser head (22) are both mounted on the mounting plate (46), so that the laser thickness measuring component (2) can float elastically in both directions of the cross.

3. The thickness measuring device for acid-resistant low-carbon seamless steel pipes according to claim 2, characterized in that, There are three side-position laser heads (22), and the three side-position laser heads (22) extend into the internal channels of three adjacent tubes to be tested (3); The center laser head (21) can emit lasers in three directions at the same time. The laser emitted in each direction is matched with the corresponding side laser head (22), so that the laser thickness measuring component (2) can simultaneously complete the wall thickness detection of three adjacent tubes (3) after one movement.

4. The thickness measuring device for acid-resistant low-carbon seamless steel pipes according to claim 3, characterized in that, A synchronous telescopic moving module is installed between the mounting plate (46) and the laser thickness measuring component (2). The side laser head (22) is slidably mounted on the surface of the mounting plate (46), and the triangular block (211) is fixedly connected to the surface of the mounting plate (46). The synchronous telescopic moving module drives the side laser head (22) to slide along the surface of the mounting plate (46) to realize the adjustment of the distance between the side laser head (22) and the center laser head (21).

5. The thickness measuring device for acid-resistant low-carbon seamless steel pipes according to claim 4, characterized in that, The synchronous telescopic moving module includes a toothed disc (47), which passes through the mounting plate (46) and is hinged to the surface of the slider (44). The toothed disc (47) can rotate around its own axis. The surface of the toothed disc (47) is provided with a curved groove (471), and the surface of the mounting plate (46) is provided with a straight groove (461). The number of straight grooves (461) and curved grooves (471) are adapted to the number of side laser heads (22), and the side laser heads (22) are correspondingly inserted through the curved grooves (471) and slide in cooperation with the straight grooves (461).

6. The thickness measuring device for acid-resistant low-carbon seamless steel pipes according to claim 5, characterized in that, The synchronous telescopic moving module also includes a drive source (462), which is located on the outside of the mounting plate (46). A fixing plate extends outward from the surface of the slider (44), and the drive source (462) is fixedly connected to the fixing plate. A drive gear (463) is fixedly mounted on the output shaft of the drive source (462), and the drive gear (463) meshes with the gear plate (47).

7. The thickness measuring device for acid-resistant low-carbon seamless steel pipes according to claim 6, characterized in that, The curved groove (471) is arc-shaped, with one end close to the center of the toothed disk (47) and the other end far away from the center of the toothed disk (47). The curved groove (471) cooperates with the side laser head (22) to drive the side laser head (22) to move radially synchronously along the straight groove (461).

8. The thickness measuring device for acid-resistant low-carbon seamless steel pipes according to claim 5, characterized in that, The side of the side-mounted laser head (22) near the mounting plate (46) has a rod-shaped structure; The rod-shaped structure of the side laser head (22) and the triangular block (211) are both equipped with telescopic sections (23). The telescopic section (23) is an electrically controlled telescopic structure, which realizes the telescopic movement of the center laser head (21) and the side laser head (22).

9. The thickness measuring device for acid-resistant low-carbon seamless steel pipes according to claim 8, characterized in that, The telescopic section (23) is a multi-stage electrically controlled telescopic structure. Through multi-stage telescopic cooperation, the telescopic stroke of the center laser head (21) and the side laser head (22) is expanded to adapt to the testing requirements of tubes (3) of different lengths and specifications.

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