Detection device for steel pipe crack

Abstract

The invention provides a detection device for steel pipe cracks. The detection device comprises a base, a clamping mechanism, a control mechanism, a cleaning mechanism and a detection mechanism, the clamping mechanism is mounted on the base so as to rotatably mount and clamp a steel pipe to be detected on the base; the control mechanism controls the steel pipe to rotate; the number of the cleaning mechanisms is two, and the two cleaning mechanisms are oppositely arranged and installed on the base so as to clean the inner side wall and the outer side wall of the steel pipe correspondingly. The cleaning mechanism comprises a cleaning brush and a driving assembly; the detection mechanism comprises a detection head and a light source. The control mechanism can coordinate the action rhythms of the cleaning mechanism and the detection mechanism while driving the steel pipe to rotate, so that the moving speed and the rotating speed of the cleaning brush are matched with the sampling frequency of the detection head, and full-coverage and dead-corner-free detection of the inner wall and the outer wall of the steel pipe is realized. According to the design, cleaning and detection are integrated, the cleaning action is driven through rotation of the steel pipe, an extra power source is reduced, and meanwhile the timeliness and accuracy of detection are ensured through synchronous movement.

Description

Technical Field

[0001] This invention relates to the field of pipe crack detection technology, and specifically to a crack detection device for steel pipes. Background Technology

[0002] Steel pipes are hollow steel materials whose length is much greater than their diameter or circumference. They are used to transport fluids and powdery solids, exchange heat energy, and manufacture mechanical parts and containers. When transporting liquids, cracks in the steel pipes can cause leaks. Therefore, it is necessary to inspect and treat steel pipe cracks during production to prevent leaks. However, existing steel pipe crack inspection methods rely on manual inspection, which is labor-intensive, time-consuming, and the dust on the steel pipe surface can obstruct the detection of cracks, resulting in poor accuracy and limited practicality.

[0003] Therefore, a detection device is needed to inspect the steel pipes. For example, patent CN110044915B discloses a steel pipe crack detection device, which includes a steel pipe crack detection workbench, a steel pipe fixing groove, a rotating disk, a first groove, and a second groove. A support base is fixedly installed at the bottom of the steel pipe crack detection workbench, and a steel pipe fixing groove is opened at the top of the steel pipe crack detection workbench. A supporting round rod is installed on the steel pipe crack detection workbench at one end of the steel pipe fixing groove, and a rotating shaft is installed on the steel pipe crack detection workbench at the other end of the steel pipe fixing groove. A rotating disk is fixedly installed on the rotating shaft.

[0004] However, this testing device still has certain limitations in practical applications. Its design primarily targets cleaning dust and impurities from the outer surface of the steel pipe to eliminate external interference, but it does not consider the cleaning requirements of the inner surface. In actual production and storage, dust, scale, or other residual impurities easily adhere to the inner surface of the steel pipe. If these impurities are not effectively removed, they may directly obscure existing cracks on the inner surface, leading to deviations in the test results. This makes it impossible to comprehensively guarantee the accuracy of testing both the inner and outer surfaces of the steel pipe, and thus fails to fully meet the actual needs of comprehensive surface quality testing of steel pipes. Summary of the Invention

[0005] To address the aforementioned problems in existing technologies, the technical problem this invention aims to solve is that existing testing devices still have certain limitations in practical applications. Their design primarily targets cleaning dust and impurities from the outer surface of the steel pipe to eliminate external interference factors, but it does not consider the cleaning requirements of the inner surface. During actual production and storage, dust, scale, or other residual impurities easily adhere to the inner surface of the steel pipe. If these inner surface impurities are not effectively removed, they may directly obscure existing cracks on the inner surface, leading to deviations in the test results. This makes it impossible to comprehensively guarantee the accuracy of testing both the inner and outer surfaces of the steel pipe, and thus fails to fully meet the actual needs of comprehensive surface quality testing of steel pipes.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a steel pipe crack detection device, comprising: Base; A clamping mechanism is installed on the base to rotatably clamp the steel pipe to be tested onto the base; The control mechanism controls the rotation of the steel pipe; Two cleaning mechanisms are provided, arranged opposite each other and mounted on the base, to clean the inner and outer walls of the steel pipe respectively; each cleaning mechanism includes a cleaning brush and a drive assembly; the cleaning brush abuts against the steel pipe; the drive assembly drives the cleaning brush to rotate according to the rotation of the steel pipe, and moves it along the length of the steel pipe; and The testing mechanism includes a testing head and a light source; the testing head and the light source move synchronously with the two cleaning brushes to test the steel pipe.

[0007] Preferably, the drive assembly includes: a guide groove, a guide rod, a slide block, a friction roller, a first bevel gear, a second bevel gear, a third bevel gear, a winding shaft, and a pull wire; the guide groove is mounted on the base along the length of the steel pipe, and the slide block is slidably mounted in the guide groove; the guide rod is rotatably mounted in the guide groove along the length of the steel pipe, and a limit slot is formed in the length of the guide rod; The friction roller is coaxially mounted on the guide rod so that the friction roller rotates synchronously with the guide rod, and the friction roller abuts against the steel pipe; the first bevel gear, the second bevel gear, and the third bevel gear are all rotatably mounted on the slide; the first bevel gear and the third bevel gear are coaxially opposite each other; the first bevel gear and the third bevel gear are both sleeved on the guide rod, and the first bevel gear has a protrusion that engages with the limiting channel, so that the first bevel gear rotates coaxially with the guide rod and can slide along the length of the guide rod; the second bevel gear is located between the first bevel gear and the third bevel gear; the axis of the second bevel gear is perpendicular to the axis of the first bevel gear; the second bevel gear meshes with the first bevel gear and the third bevel gear simultaneously; the winding shaft is coaxially fixed to the second bevel gear; one end of the pull wire is mounted on the winding shaft, and the other end of the pull wire is mounted in the guide groove away from the slide; the cleaning brush is coaxially fixed to the third bevel gear; the detection head and the light source are respectively mounted on the two corresponding slides.

[0008] Preferably, the friction roller is sleeved on the guide rod, and the friction roller is provided with a protrusion that engages with the limiting channel, so that the friction roller rotates synchronously with the guide rod and can slide along the length of the guide rod.

[0009] Preferably, the two cleaning mechanisms are mounted on the base via an adjustment mechanism to adjust the distance between the two cleaning mechanisms so that the two friction rollers abut against the steel pipe.

[0010] Preferably, an adjustment mechanism is provided at each end of the guide groove; the adjustment mechanism includes: a splined shaft, a double-acting screw, a nut seat, and a first motor; a vertical sliding groove is provided on the base; the splined shaft is rotatably installed in the sliding groove; the double-acting screw is coaxially sleeved on the splined shaft and connected to the splined shaft via a spline; both nut seats are slidably installed in the sliding groove, and the two nut seats are respectively threaded to both ends of the double-acting screw; and the two nut seats are provided in a one-to-one correspondence with the two guide grooves, with the end of the guide groove installed on the corresponding nut seat; the first motor drives the splined shaft to rotate.

[0011] Preferably, the end of the guide groove is detachably mounted on the corresponding nut seat.

[0012] Preferably, the clamping mechanism includes multiple clamping components arranged in a circular array with the circumference of the steel pipe as the center; each clamping component includes a clamping seat and a clamping roller; each clamping roller has a clamping seat at both ends, and the clamping roller is rotatably mounted on two clamping seats; the clamping seats are slidably mounted on the base, the sliding distance of the clamping seats is adjustable, and the extension lines of the sliding directions of the multiple clamping seats on the same side all intersect the axis of the steel pipe.

[0013] Preferably, the control mechanism includes a second motor; the second motor drives one of the clamping rollers to rotate.

[0014] Compared with the prior art, the present invention has at least the following advantages: 1. In this invention, the control mechanism, while driving the steel pipe to rotate, can coordinate the movement rhythm of the cleaning mechanism and the detection mechanism, matching the moving speed and rotation speed of the cleaning brush with the sampling frequency of the detection head, achieving full coverage and no blind spots in the detection of the inner and outer walls of the steel pipe. This design integrates cleaning and detection, utilizing the rotation of the steel pipe itself to drive the cleaning action, reducing the need for additional power sources, while ensuring timely and accurate detection through synchronous movement, adapting to the high-efficiency detection needs of various steel pipe cracks.

[0015] 2. In this invention, the rotation of the steel pipe drives the friction roller, sequentially converting the rotational motion of the steel pipe into the rotation of the guide rod, the direction change of the bevel gear set, and the winding action of the winding shaft. This ultimately achieves the axial movement of the slide and the rotation of the cleaning brush. Without an additional power source, the cleaning brush can perform a combined action of rotating and cleaning while moving along the length of the steel pipe, ensuring the cleaning range covers the entire steel pipe area. Simultaneously, the detection head and light source move synchronously with the slide, enabling immediate detection in areas just cleaned by the cleaning brush, avoiding interference from residual impurities. Furthermore, the stability of the bevel gear transmission and the wire drive... The uniform speed ensures precise synchronization of cleaning and inspection actions, significantly improving the efficiency and accuracy of steel pipe crack detection. Furthermore, the rotation direction of the third bevel gear is opposite to that of the steel pipe. This reverse rotation design allows the cleaning brush to form relative sliding friction with the steel pipe surface, rather than the following friction generated by co-rotation. This greatly enhances the cleaning brush's ability to remove rust and dust from the steel pipe surface, preventing impurities from remaining due to co-rotation with the cleaning brush. This ensures a cleaner steel pipe surface after cleaning, providing the inspection agency with a clear and interference-free inspection surface, further guaranteeing the accuracy of crack detection.

[0016] 3. In this invention, the adjustment mechanism, combined with the axial sliding function of the friction roller along the guide rod, enables the device to adapt to steel pipes of different diameters and thicknesses. The adjustment mechanism ensures that the radial pressure between the friction roller and the steel pipe surface is moderate, avoiding both insufficient pressure leading to friction transmission failure and excessive pressure damaging the steel pipe surface, ensuring that the friction roller rotates stably and synchronously when the steel pipe rotates. Simultaneously, after the spacing of the cleaning mechanism is adjusted, the positions of the detection head and the light source also adapt synchronously to the steel pipe diameter, ensuring that the detection head always maintains the optimal detection distance from the steel pipe surface. Ultimately, this achieves efficient cleaning and accurate detection of steel pipes of different specifications, significantly expanding the applicability of the device. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is a perspective view of a steel pipe crack detection device provided in an embodiment of the present invention.

[0019] Figure 2 This is a front view of a steel pipe crack detection device provided in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the adjustment mechanism provided in an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the cleaning mechanism provided in an embodiment of the present invention.

[0022] Reference numerals: 1. Base; 11. Slide groove; 2. Clamping mechanism; 21. Clamping seat; 22. Clamping roller; 3. Cleaning mechanism; 31. Cleaning brush; 32. Guide groove; 33. Guide rod; 34. Slide seat; 35. Friction roller; 36. First bevel gear; 37. Second bevel gear; 38. Third bevel gear; 39. Winding shaft; 310. Pull wire; 4. Detection mechanism; 41. Detection head; 42. Light source; 5. Adjustment mechanism; 51. Splined shaft; 52. Double-acting screw; 53. Nut seat. Detailed Implementation

[0023] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0024] In this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] See Figures 1-4The present invention provides an embodiment of a steel pipe crack detection device, comprising: a base 1, a clamping mechanism 2, a control mechanism, a cleaning mechanism 3, and a detection mechanism 4; the clamping mechanism 2 is installed on the base 1 to rotatably clamp the steel pipe to be detected on the base 1; the control mechanism controls the rotation of the steel pipe; two cleaning mechanisms 3 are provided, which are arranged opposite each other and installed on the base 1 to clean the inner and outer walls of the steel pipe respectively; the cleaning mechanism 3 includes: a cleaning brush 31 and a driving assembly; the cleaning brush 31 abuts against the steel pipe; the driving assembly drives the cleaning brush 31 to rotate according to the rotation of the steel pipe and moves along the length direction of the steel pipe; the detection mechanism 4 includes a detection head 41 and a light source 42; the detection head 41 and the light source 42 move synchronously with the two cleaning brushes 31 to detect the steel pipe.

[0027] In practical implementation, the steel pipe crack detection device achieves automated detection of steel pipes through the collaboration of multiple mechanisms: the base 1 serves as the installation foundation, the clamping mechanism 2 rotatably fixes the steel pipe to be tested on the base 1, and the control mechanism drives the steel pipe to rotate around its own axis; the two cleaning mechanisms 3 correspond to the inner and outer walls of the steel pipe respectively, and their cleaning brushes 31 abut against the surface of the steel pipe. When the steel pipe rotates, the drive component is driven by the rotation of the steel pipe to drive the cleaning brushes 31 to rotate synchronously, forming friction cleaning on the surface of the steel pipe. At the same time, it drives the cleaning brushes 31 to move along the length of the steel pipe to achieve cleaning of the entire surface of the steel pipe and remove impurities such as rust and dust that interfere with the detection.

[0028] The detection head 41 and the light source 42 of the detection mechanism 4 are respectively installed on two cleaning brushes 31, and move and rotate synchronously with the cleaning brushes 31: the light source 42 illuminates the surface of the cleaned steel pipe to ensure that the detection head 41 can clearly collect the image or reflected signal of the steel pipe surface; since cleaning and detection are carried out simultaneously, the detection head 41 can directly detect the area that has just been cleaned, avoiding the impact of impurities on detection accuracy.

[0029] While driving the steel pipe to rotate, the control mechanism coordinates the movement rhythm of the cleaning mechanism 3 and the detection mechanism 4, matching the moving speed and rotation speed of the cleaning brush 31 with the sampling frequency of the detection head 41, achieving full coverage and no blind spots in the detection of the inner and outer walls of the steel pipe. This design integrates cleaning and detection, utilizing the rotation of the steel pipe itself to drive the cleaning action, reducing the need for additional power sources, while ensuring timely and accurate detection through synchronous movement, adapting to the high-efficiency detection needs of various steel pipe cracks.

[0030] See Figures 1-4In other embodiments, the drive assembly includes: a guide groove 32, a guide rod 33, a slide 34, a friction roller 35, a first bevel gear 36, a second bevel gear 37, a third bevel gear 38, a winding shaft 39, and a pull wire 310; the guide groove 32 is mounted on the base 1 along the length of the steel pipe, and the slide 34 is slidably mounted in the guide groove 32; the guide rod 33 is rotatably mounted in the guide groove 32 along the length of the steel pipe, and a limit groove is formed in the length of the guide rod 33; The friction roller 35 is coaxially mounted on the guide rod 33 so that the friction roller 35 rotates synchronously with the guide rod 33, and the friction roller 35 abuts against the steel pipe; the first bevel gear 36, the second bevel gear 37, and the third bevel gear 38 are all rotatably mounted on the slide block 34; the first bevel gear 36 and the third bevel gear 38 are coaxially arranged facing each other; the first bevel gear 36 and the third bevel gear 38 are both sleeved on the guide rod 33, and the first bevel gear 36 is provided with a protrusion that engages with the limiting channel so that the first bevel gear 36 rotates coaxially with the guide rod 33 and can slide along the length of the guide rod 33. The second bevel gear 37 is located between the first bevel gear 36 and the third bevel gear 38; the axis of the second bevel gear 37 is perpendicular to the axis of the first bevel gear 36; the second bevel gear 37 meshes with the first bevel gear 36 and the third bevel gear 38 simultaneously; the winding shaft 39 is coaxially fixed with the second bevel gear 37; one end of the pull wire 310 is installed on the winding shaft 39, and the other end of the pull wire 310 is installed in the guide groove 32 at the end away from the slide 34; the cleaning brush 31 is coaxially fixed with the third bevel gear 38; the detection head 41 and the light source 42 are respectively installed on the two corresponding slides 34.

[0031] In specific implementation, the transmission process of the drive assembly is as follows: When the control mechanism drives the steel pipe to rotate, the friction roller 35, which abuts against the steel pipe, rotates synchronously under the action of friction, driving the coaxial guide rod 33 to rotate; the guide rod 33 engages with the protrusion of the first bevel gear 36 through a limiting slot, driving the first bevel gear 36 to rotate synchronously with the guide rod 33, while allowing the first bevel gear 36 to slide along the length of the guide rod 33; the first bevel gear 36 meshes with the second bevel gear 37, converting the horizontal rotational motion into vertical rotation, driving... The second bevel gear 37 rotates with the coaxial winding shaft 39. As the winding shaft 39 rotates, it gradually winds up the pull wire 310. Under the tension of the pull wire 310, the slide 34 slides along the guide groove 32 toward the end of the guide groove 32. Since the second bevel gear 37 meshes with the third bevel gear 38 at the same time, the second bevel gear 37 drives the third bevel gear 38 to rotate synchronously when it rotates. This causes the cleaning brush 31, which is fixed coaxially with the third bevel gear 38, to rotate at high speed while moving with the slide 34, thereby achieving spiral cleaning of the steel pipe surface (inner or outer side).

[0032] To this end, the structure drives the friction roller 35 by rotating the steel pipe itself, sequentially converting the rotational motion of the steel pipe into the rotation of the guide rod 33, the direction change of the bevel gear set, and the winding action of the winding shaft 39. This ultimately achieves the axial movement of the slide 34 and the rotation of the cleaning brush 31. Without an additional power source, the cleaning brush 31 can perform a combined action of rotating and cleaning while moving along the length of the steel pipe, ensuring the cleaning range covers the entire steel pipe area. Simultaneously, the detection head 41 and the light source 42 move synchronously with the slide 34, enabling immediate detection of areas just cleaned by the cleaning brush 31, avoiding interference from residual impurities. Furthermore, the stability of the bevel gear transmission is... The uniform speed of the pull wire 310 ensures precise synchronization of cleaning and inspection actions, significantly improving the efficiency and accuracy of steel pipe crack detection. Furthermore, the rotation direction of the third bevel gear 38 is opposite to that of the steel pipe. This reverse rotation design allows the cleaning brush 31 to form relative sliding friction with the steel pipe surface, rather than the following friction generated by co-rotation. This significantly improves the removal force of the cleaning brush 31 on the steel pipe surface of rust and dust, and avoids the residue of impurities due to co-rotation with the cleaning brush 31. This ensures a cleaner steel pipe surface after cleaning, providing a clear and interference-free inspection surface for the inspection mechanism 4, further guaranteeing the accuracy of crack detection.

[0033] See Figures 1-4 In other embodiments, the friction roller 35 is sleeved on the guide rod 33, and the friction roller 35 has a protrusion that engages with the limiting channel, so that the friction roller 35 rotates synchronously with the guide rod 33 and can slide along the length of the guide rod 33. This slidable design allows the friction roller 35 to adapt to steel pipes of different lengths, ensuring that the guide rod 33 can be driven to rotate through friction transmission when steel pipes of various specifications rotate, thereby ensuring the transmission stability of subsequent components such as the bevel gear set, the winding shaft 39, and the slide 34.

[0034] See Figures 1-4 In other embodiments, the two cleaning mechanisms 3 are mounted on the base 1 via an adjusting mechanism 5 to adjust the distance between them, allowing the two friction rollers 35 to contact the steel pipe. The adjusting mechanism 5, combined with the axial sliding function of the friction rollers 35 along the guide rod 33, enables the device to adapt to steel pipes of different diameters and thicknesses. The adjusting mechanism 5 ensures moderate radial pressure between the friction rollers 35 and the steel pipe surface, preventing both insufficient pressure leading to friction transmission failure and excessive pressure damaging the steel pipe surface, ensuring stable and synchronous rotation of the friction rollers 35 when the steel pipe rotates. Simultaneously, after the distance between the cleaning mechanisms 3 is adjusted, the positions of the detection head 41 and the light source 42 also adapt synchronously to the steel pipe diameter, ensuring that the detection head 41 always maintains the optimal detection distance from the steel pipe surface. Ultimately, this achieves efficient cleaning and accurate detection of steel pipes of different specifications, significantly expanding the applicability of the device.

[0035] Furthermore, adjustment mechanisms 5 are respectively provided at both ends of the guide groove 32; the adjustment mechanism 5 includes: a spline shaft 51, a bidirectional screw 52, ​​a nut seat 53 and a first motor; a vertical sliding groove 11 is provided on the base 1; the spline shaft 51 is rotatably installed in the sliding groove 11; the bidirectional screw 52 is coaxially sleeved on the spline shaft 51 and connected to the spline shaft 51 through a spline; both nut seats 53 are slidably installed in the sliding groove 11, and the two nut seats 53 are respectively threaded to both ends of the bidirectional screw 52; and the two nut seats 53 are correspondingly provided with the two guide grooves 32, and the ends of the guide grooves 32 are installed on the corresponding nut seats 53; the first motor drives the spline shaft 51 to rotate.

[0036] In specific implementation, the first motor drives the spline shaft 51 to rotate within the vertical slide groove 11 of the base 1. Since the bidirectional screw 52 is connected to the spline shaft 51 via a spline, the rotation of the spline shaft 51 drives the bidirectional screw 52 to rotate synchronously, while allowing the bidirectional screw 52 to slide along the axial direction of the spline shaft 51 to adapt to subsequent spacing adjustment. The threads at both ends of the bidirectional screw 52 have opposite directions and are threadedly connected to two nut seats 53 respectively. When the bidirectional screw 52 rotates, the two nut seats 53 are driven by the threads to move towards or away from each other along the slide groove 11. When the first motor rotates forward, the nut seats 53 drive the two guide grooves 32 to move closer to each other, reducing the distance between the two cleaning mechanisms 3. When the first motor rotates in reverse, the nut seats 53 drive the guide grooves 32 to move away from each other, increasing the distance.

[0037] To this end, the rotational motion of the first motor is converted into the synchronous, counter-current linear motion of the two nut seats 53 through the cooperation of the spline shaft 51 and the bidirectional screw 52. This achieves precise adjustment of the distance between the two cleaning mechanisms 3, ensuring that the inner and outer friction rollers 35 can tightly abut against steel pipes of different diameters. Simultaneously, the spline connection allows the bidirectional screw 52 to slide synchronously along the spline shaft 51 with the nut seats 53, ensuring stable thread engagement between the bidirectional screw 52 and the nut seats 53 during adjustment, eliminating the risk of jamming. This design automates and highly precisely adjusts the distance. Combined with the axial sliding function of the cleaning mechanism 3 itself, it further expands the device's adaptability to different steel pipe specifications, ensuring that the cleaning brush 31 and the detection mechanism 4 maintain optimal working positions regardless of changes in steel pipe diameter, guaranteeing the stability of cleaning effect and detection accuracy.

[0038] See Figures 1-4In other embodiments, the end of the guide groove 32 is detachably mounted on the corresponding nut seat 53. Specifically, the end of the guide groove 32 is connected to the corresponding nut seat 53 via detachable structures such as bolts or clips. The advantages of this detachable design are: firstly, it significantly improves the flexibility of device maintenance and upgrades; when the guide groove 32 wears or deforms due to long-term use, or when it needs to be replaced with a guide groove 32 of different lengths or structures to fit special steel pipes, only the guide groove 32 needs to be replaced, reducing maintenance costs and operational difficulty; secondly, it retains the versatility of the adjustment mechanism 5. Regardless of the specification of the guide groove 32 being replaced, the precise adjustment of the distance between the two cleaning mechanisms 3 can continue through the cooperation of the nut seat 53 and the bidirectional screw 52, ​​ensuring that the friction roller 35 and cleaning brush 31 on the new guide groove 32 can still effectively contact the surface of the steel pipe. Simultaneously, the detachable connection design also facilitates the installation of the steel pipe.

[0039] See Figures 1-4 In other embodiments, the clamping mechanism 2 includes multiple clamping components arranged in a circular array with the circumference of the steel pipe as the center; the clamping components include: clamping seats 21 and clamping rollers 22; clamping seats 21 are respectively provided at both ends of the clamping rollers 22, and the clamping rollers 22 are rotatably mounted on the two clamping seats 21; the clamping seats 21 are slidably mounted on the base 1, the sliding distance of the clamping seats 21 is adjustable, and the extension lines of the sliding direction of the multiple clamping seats 21 on the same side all intersect the axis of the steel pipe.

[0040] In practice, the clamping mechanism 2 achieves stable clamping of the steel pipe through multiple clamping components arranged in a circular array: the clamping rollers 22 of each clamping component are rotatably mounted at both ends through clamping seats 21, and the clamping seats 21 move along a preset sliding path on the base 1, and the extended sliding directions of all clamping seats 21 on the same side converge at the axis of the steel pipe. When the steel pipe to be tested is placed, the sliding distance of each clamping seat 21 is adjusted, such as by driving it with a screw, cylinder, etc., so that the clamping rollers 22 move closer to and abut against the outer circumference of the steel pipe. Utilizing the distribution characteristics of the circular array, the steel pipe is supported in a ring-like manner from multiple directions, ensuring that the axis of the steel pipe coincides with the rotation center of the clamping mechanism 2.

[0041] When the steel pipe rotates, the clamping roller 22 rotates synchronously with the steel pipe. The rolling friction reduces damage to the surface of the steel pipe. The synergistic effect of multiple clamping components can counteract the radial force when the steel pipe rotates, preventing the steel pipe from shaking or shifting. For steel pipes of different diameters, by adjusting the sliding distance of the clamping seat 21, the clamping roller 22 can always be in close contact with the outer circumference of the steel pipe, adapting to various specifications of steel pipes from small diameter to large diameter.

[0042] See Figures 1-4In another embodiment, the control mechanism includes a second motor; the second motor drives one of the clamping rollers 22 to rotate. In specific implementation, the second motor of the control mechanism is directly connected to one of the clamping rollers 22 in the clamping mechanism 2, such as through a coupling or belt drive; when the second motor starts, it drives the clamping roller 22 to rotate actively. Since the clamping roller 22 is in close contact with the outer circumference of the steel pipe, the steel pipe is driven to rotate synchronously with the clamping roller 22 by means of friction. The clamping rollers 22 of the other clamping components are passively rotated under the drive of the steel pipe, forming a driven support.

[0043] 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A device for detecting cracks in steel pipes, characterized in that, include: Base; A clamping mechanism is installed on the base to rotatably clamp the steel pipe to be tested onto the base; The control mechanism controls the rotation of the steel pipe; Two cleaning mechanisms are provided, arranged opposite each other and mounted on the base, to clean the inner and outer walls of the steel pipe respectively; each cleaning mechanism includes a cleaning brush and a drive assembly; the cleaning brush abuts against the steel pipe; the drive assembly drives the cleaning brush to rotate according to the rotation of the steel pipe, and moves it along the length of the steel pipe; and The testing mechanism includes a testing head and a light source; the testing head and the light source move synchronously with the two cleaning brushes to test the steel pipe.

2. The steel pipe crack detection device according to claim 1, characterized in that, The drive assembly includes: a guide groove, a guide rod, a slide block, a friction roller, a first bevel gear, a second bevel gear, a third bevel gear, a winding shaft, and a pull wire; the guide groove is mounted on the base along the length of the steel pipe, and the slide block is slidably mounted in the guide groove; the guide rod is rotatably mounted in the guide groove along the length of the steel pipe, and a limit slot is formed in the length of the guide rod; The friction roller is coaxially mounted on the guide rod so that the friction roller rotates synchronously with the guide rod, and the friction roller abuts against the steel pipe; the first bevel gear, the second bevel gear, and the third bevel gear are all rotatably mounted on the slide; the first bevel gear and the third bevel gear are coaxially opposite each other; the first bevel gear and the third bevel gear are both sleeved on the guide rod, and the first bevel gear has a protrusion that engages with the limiting channel, so that the first bevel gear rotates coaxially with the guide rod and can slide along the length of the guide rod; the second bevel gear is located between the first bevel gear and the third bevel gear; the axis of the second bevel gear is perpendicular to the axis of the first bevel gear; the second bevel gear meshes with the first bevel gear and the third bevel gear simultaneously; the winding shaft is coaxially fixed to the second bevel gear; one end of the pull wire is mounted on the winding shaft, and the other end of the pull wire is mounted in the guide groove away from the slide; the cleaning brush is coaxially fixed to the third bevel gear; the detection head and the light source are respectively mounted on the two corresponding slides.

3. The steel pipe crack detection device according to claim 2, characterized in that, The friction roller is sleeved on the guide rod, and the friction roller has a protrusion that engages with the limiting channel, so that the friction roller rotates synchronously with the guide rod and can slide along the length of the guide rod.

4. The steel pipe crack detection device according to claim 2, characterized in that, The two cleaning mechanisms are mounted on the base via an adjustment mechanism to adjust the distance between the two cleaning mechanisms so that the two friction rollers abut against the steel pipe.

5. The steel pipe crack detection device according to claim 4, characterized in that, An adjustment mechanism is provided at each end of the guide groove; the adjustment mechanism includes: a splined shaft, a double-acting screw, a nut seat, and a first motor; a vertical sliding groove is provided on the base; the splined shaft is rotatably installed in the sliding groove; the double-acting screw is coaxially sleeved on the splined shaft and connected to the splined shaft via a spline; both nut seats are slidably installed in the sliding groove, and the two nut seats are respectively threaded to both ends of the double-acting screw; the two nut seats are provided in a one-to-one correspondence with the two guide grooves, and the ends of the guide grooves are installed on the corresponding nut seats; the first motor drives the splined shaft to rotate.

6. The steel pipe crack detection device according to claim 5, characterized in that, The end of the guide groove is detachably mounted on the corresponding nut seat.

7. The steel pipe crack detection device according to claim 1, characterized in that, The clamping mechanism includes multiple clamping components arranged in a circular array centered on the circumference of the steel pipe. Each clamping component includes a clamping seat and a clamping roller. Each clamping roller has a clamping seat at both ends and is rotatably mounted on two clamping seats. The clamping seats are slidably mounted on the base, and the sliding distance of the clamping seats is adjustable. The extension lines of the sliding directions of the multiple clamping seats on the same side all intersect the axis of the steel pipe.

8. A steel pipe crack detection device according to claim 7, characterized in that, The control mechanism includes a second motor; the second motor drives one of the clamping rollers to rotate.

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