A stainless steel pipe and a hole surface defect detection machine thereof

Abstract

This invention relates to the field of pipeline inspection technology, specifically a stainless steel pipe and its internal surface defect inspection machine. The stainless steel pipe includes a pipe wall with an internal through-hole at its center. The inspection machine includes symmetrically arranged pipeline robots, a zinc sulfide protective window positioned between two of the pipeline robots, a cylindrical mounting platform installed at one end of the zinc sulfide protective window, four air jets evenly arranged on the side of the cylindrical mounting platform facing the zinc sulfide protective window, and a hollow support base fixedly connected to the other end of the zinc sulfide protective window, evenly arranged on one side of the hollow support base. This invention utilizes the synergistic effect of a scraping component driving an arc-shaped scraper for mechanical scraping, a cleaning component driving a cleaning agent for chemical dissolution, and an air curtain component for directional airflow for immediate drying to remove viscous oil and metal dust from the surface of the zinc sulfide protective window. This avoids residual liquid film interfering with the laser and infrared signal paths, improving the detection accuracy and efficiency of the inspection components.

Description

Technical Field

[0001] This invention relates to the field of pipeline inspection technology, specifically a stainless steel pipe and its inner bore surface defect inspection machine. Background Technology

[0002] In the high-precision manufacturing of stainless steel pipes, non-destructive and efficient detection of surface defects in the inner bore is crucial. Laser infrared thermal imaging technology, with its non-contact nature, high sensitivity, and imaging capabilities, has become the preferred solution in this field. Its principle involves precisely projecting a high-energy laser beam onto the inner surface of the pipe wall using an endoscopic optical system to induce localized thermal excitation. Due to the difference in thermophysical properties between the defect area and the base material, different temperature changes occur upon heating, which are released as infrared radiation. The system captures and analyzes these radiation signals using an infrared thermal imager to reconstruct an image of the defect on the inner surface.

[0003] However, extending this optical system deep into the pipe presents significant challenges: contaminants such as residual cutting fluid, lubricating oil, condensate, and metal dust within the pipe readily adhere to the optical system's surface. These contaminants scatter, absorb, and reflect the incident laser light, resulting in a significant attenuation and distortion of the laser energy actually reaching the pipe wall. This leads to insufficient thermal excitation intensity and uneven regional temperature, directly weakening the intensity of the thermal response signal generated by the defect. Simultaneously, contaminants absorb and scatter infrared radiation in specific wavelengths. This drastically reduces the intensity of the thermal signal emitted by the pipe wall defect and decreases its spatial resolution, making defect features unclear and difficult to accurately identify.

[0004] Current methods for addressing contamination typically employ air knife blowing or scraper removal. However, while conventional air knives are effective at removing dust, they have a lower removal rate for viscous oil stains, and the residual liquid film continues to interfere with both laser and infrared dual-path detection. On the other hand, after scraping away contaminants with independent scrapers, the lack of immediate drying results in residual cleaning agents forming an uneven liquid film, which not only exacerbates laser scattering but also absorbs infrared radiation. Therefore, both viscous oil stains and residual cleaning agents severely affect the detection accuracy of the optical system, thereby reducing the overall detection efficiency of the device. Summary of the Invention

[0005] The purpose of this invention is to provide a stainless steel pipe and its inner hole surface defect detection machine to solve the problems mentioned in the background art.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A surface defect detection machine for the inner bore of a stainless steel pipe, preferably, the stainless steel pipe includes a pipe wall with an inner through hole at the center of the pipe wall; the surface defect detection machine enters the interior of the inner through hole along the axial direction of the pipe wall; the surface defect detection machine includes symmetrically arranged pipe robots, a zinc sulfide protective window is provided between two of the pipe robots, a cylindrical mounting platform is installed at one end of the zinc sulfide protective window, four jet nozzles are evenly arranged on the side of the cylindrical mounting platform facing the zinc sulfide protective window, a hollow support is fixedly connected to the other end of the zinc sulfide protective window, four arc-shaped cleaning nozzles are evenly arranged on one side of the hollow support, the four arc-shaped cleaning nozzles are arranged in a circle on the outer periphery of the zinc sulfide protective window, and an arc-shaped scraper is fixedly connected to the end of the arc-shaped cleaning nozzle facing the zinc sulfide protective window and in contact with the outer surface of the zinc sulfide protective window;

[0008] The zinc sulfide protective window is equipped with a detection component inside, which monitors the local temperature inside the window and defects in the inner wall. The hollow support base is equipped with a scraping component inside, which drives the arc-shaped scraper to move axially along the zinc sulfide protective window to scrape away contaminants. One end of the zinc sulfide protective window is equipped with an adjustment component, which drives the jet head to deflect towards the surface of the zinc sulfide protective window to focus the airflow and blow it along the window. The cylindrical mounting platform is equipped with an air curtain component inside, which provides compressed air to the jet head. The hollow support base is equipped with a cleaning component inside, which sprays cleaning agent in the direction of the arc-shaped scraper to dissolve oil stains.

[0009] Preferably, the detection assembly includes a detection box rotatably connected to one end of the hollow support base and disposed inside the zinc sulfide protective window; four infrared imaging modules uniformly and fixedly connected to the outer periphery of the detection box; a fiber laser fixedly connected to the end of the detection box away from the hollow support base; a beam splitter fixedly connected to the output end of the fiber laser; and two temperature sensors symmetrically and fixedly connected to the inner side of the zinc sulfide protective window.

[0010] Preferably, the scraping assembly includes four scraping grooves evenly spaced on the outer periphery of the hollow support base, a movable rack slidably connected inside the scraping grooves and fixedly connected at one end to the arc-shaped cleaning nozzle, four transmission grooves evenly spaced on the outer periphery of the hollow support base, a transmission slider slidably connected inside the transmission grooves, a transmission gear rotatably connected to one end of the transmission slider, and four fixed racks evenly fixedly connected on the outer periphery of the hollow support base, wherein the transmission gear is located between the movable rack and the fixed rack and meshes synchronously with both.

[0011] Preferably, the extension direction of the transmission groove is parallel to the scraping groove, and the length of the moving rack is greater than the travel of the fixed rack.

[0012] Preferably, the scraping assembly further includes a main gear rotatably connected inside the hollow support base, four satellite gears evenly arranged in a circle inside the hollow support base and meshing with the main gear, a transmission rod fixedly connected to one end of the satellite gears and rotatably connected to the hollow support base, a spiral groove formed on the outer periphery of the transmission rod, a ball-head rod fixedly connected to the end of the transmission slider away from the transmission gear, the ball end of which is embedded in the spiral groove, a motor fixedly connected inside the hollow support base, and a reducer fixedly connected to the output end of the motor, with the output end of the reducer coaxially fixed to the main gear. The cooperation between the transmission gear and the moving rack and fixed rack allows the arc-shaped scraper to move along the length of the transmission groove by more than twice the travel of the transmission gear, thereby increasing the scraping range of the arc-shaped scraper.

[0013] Preferably, the adjustment assembly includes a fixed plate fixedly connected to the cylindrical mounting platform at the end facing the zinc sulfide protective window, four fixed grooves evenly opened at one end of the fixed plate, an adjustment rack slidably connected inside the fixed grooves, four incomplete gears evenly hinged to the side of the fixed plate facing the zinc sulfide protective window and fixedly connected at one end to the jet head, an annular air chamber opened inside the fixed plate and connected to the jet head through a pipe, and a return spring fixedly connected to one end of the adjustment rack and located inside the fixed groove.

[0014] Preferably, the adjustment assembly further includes an abutting wheel rotatably connected to one end of the adjustment rack, an I-shaped wheel disk fixedly connected to the end of the beam splitter and passing through the fixed plate and rotatably connected thereto, four triangular protrusions uniformly fixedly connected to the outer periphery of the I-shaped wheel disk and whose inclined surfaces roll against the abutting wheel, and an outer gear ring fixedly connected to one end of the detection box and meshing with the satellite gear.

[0015] Preferably, the air curtain assembly includes a miniature air compressor fixedly connected inside the cylindrical mounting platform, a filter fixedly connected to the air inlet of the miniature air compressor and whose input end extends to the outside of the cylindrical mounting platform, and four vortex tubes uniformly fixedly connected to the output end of the miniature air compressor and whose output end communicates with the inside of the fixed plate.

[0016] Preferably, the cleaning component includes an infusion pipe fixedly connected to the input end of the arc-shaped cleaning nozzle, a liquid storage chamber and an installation chamber opened inside the hollow support base, and a water pump fixedly connected inside the installation chamber with its input end extending into the liquid storage chamber.

[0017] Preferably, the cleaning assembly further includes four sets of storage grooves formed on the outer periphery of the hollow support base, a storage slider slidably connected inside the storage grooves, a T-shaped guide rod fixedly connected to the top of the storage slider, a storage spring fixedly connected inside the storage grooves and with one end connected to the storage slider, and T-shaped positioning rods evenly fixedly connected to the outer periphery of the hollow support base, wherein the middle section of the infusion tube is S-shaped and passes around the outer periphery of the T-shaped guide rod.

[0018] The beneficial effects of this invention are:

[0019] 1. This invention removes viscous oil and metal dust from the surface of the zinc sulfide protective window through the synergistic effect of the scraping component driving the arc-shaped scraper for mechanical scraping, the cleaning component driving the cleaning agent for chemical dissolution, and the air curtain component for immediate drying by directional airflow. This avoids residual liquid film interfering with the laser and infrared signal paths, thereby improving the detection accuracy and efficiency of the detection component.

[0020] 2. This invention uses a temperature sensor to monitor the heat buildup on the protective window in real time, triggering a closed-loop cleaning-cooling cycle. The low-temperature airflow provided by the vortex tube can achieve rapid heat exchange with the zinc sulfide protective window to remove the heat accumulated on the surface of the zinc sulfide protective window, ensuring the thermal sensitivity stability of the infrared imaging module. At the same time, it enables the detection components to be quickly put into detection work, further improving the detection efficiency of the detection machine.

[0021] 3. The present invention sets the jet head to achieve dual-mode switching through an incomplete gear: during normal detection, a wide-angle air curtain blocks contaminants, while in cleaning mode, a focused airflow blows along the zinc sulfide protective window, quickly removing the heat accumulated on the surface of the zinc sulfide protective window and drying the residual moisture on the surface of the zinc sulfide protective window, effectively avoiding secondary interference caused by cleaning agent residue. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the top structure of the hollow support base in this invention;

[0025] Figure 3 yes Figure 2 Sectional view at point A in the middle;

[0026] Figure 4 This is a schematic diagram of the internal structure of the detection box in this invention;

[0027] Figure 5 This is an exploded view showing the positional relationship between the hollow support base, the arc-shaped cleaning nozzle, and the arc-shaped scraper in this invention.

[0028] Figure 6 This is a schematic diagram of the internal structure of the external toothed ring in this invention;

[0029] Figure 7 This is a three-dimensional structural diagram of the air curtain assembly in this invention;

[0030] Figure 8 This is a schematic diagram illustrating the positional relationship between the adjusting rack and the incomplete gear in this invention;

[0031] Figure 9 This is an exploded view of the internal structure of the receiving groove in this invention;

[0032] The attached diagram is labeled as follows: 1. Pipe wall; 2. Inner through hole; 3. Pipeline robot; 4. Zinc sulfide protective window; 5. Cylindrical mounting platform; 6. Jet nozzle; 7. Hollow support base; 8. Arc-shaped cleaning nozzle; 9. Arc-shaped scraper; 10. Detection box; 11. Infrared imaging module; 12. Fiber laser; 13. Beam splitter; 14. Temperature sensor; 16. Scraping groove; 17. Moving rack; 18. Transmission groove; 19. Transmission slider; 20. Transmission gear; 21. Fixed rack; 22. Main gear; 23. Satellite gear; 24. Transmission rod; 25. Spiral. 26. Slot; 27. Ball joint rod; 28. Motor; 29. ​​Reducer; 30. Fixed plate; 31. Fixed slide groove; 32. Adjusting rack; 33. Incomplete gear; 34. Annular air chamber; 35. Return spring; 36. Abutment wheel; 37. I-beam wheel; 38. Triangular protrusion; 39. External gear ring; 40. Miniature air compressor; 41. Filter; 42. Vortex tube; 43. Infusion tube; 44. Liquid storage tank; 45. Installation tank; 46. Water pump; 47. Receiving slide groove; 48. Receiving slider; 49. T-shaped guide rod; 50. Receiving spring; 61. T-shaped positioning rod. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] A defect detection machine for the inner surface of stainless steel pipes, wherein the stainless steel pipe is the object to be inspected, and its inner surface needs to be scanned for defects; the detection machine is a pipe endoscopic optical inspection device, specifically used for non-destructive testing of the inner surface of stainless steel pipes.

[0035] like Figures 1-5 As shown, the stainless steel pipe includes a pipe wall 1, with an inner through hole 2 opened in the center of the pipe wall 1; the inner hole surface defect detection machine enters the inner through hole 2 along the axial direction of the pipe wall 1. The inner hole surface defect detection machine includes symmetrically arranged pipe robots 3, with a zinc sulfide protective window 4 between the two pipe robots 3. A cylindrical mounting platform 5 is installed at one end of the zinc sulfide protective window 4. Four jet nozzles 6 are evenly arranged on the side of the cylindrical mounting platform 5 facing the zinc sulfide protective window 4. A hollow support base 7 is fixedly connected to the other end of the zinc sulfide protective window 4. Four arc-shaped cleaning nozzles 8 are evenly arranged on one side of the hollow support base 7. The four arc-shaped cleaning nozzles 8 are arranged in a circle on the outer periphery of the zinc sulfide protective window 4. An arc-shaped scraper 9 is fixedly connected to the end of the arc-shaped cleaning nozzle 8 facing the zinc sulfide protective window 4 and is in contact with the outer surface of the zinc sulfide protective window 4.

[0036] The zinc sulfide protective window 4 is equipped with a detection component, which is used to monitor the local temperature inside the zinc sulfide protective window 4 and the defects on the inner wall of the pipe wall 1. The hollow support base 7 is equipped with a scraping component, which is used to drive the arc-shaped scraper 9 to move along the axial direction of the zinc sulfide protective window 4 to scrape contaminants. One end of the zinc sulfide protective window 4 is equipped with an adjustment component, which is used to drive the jet head 6 to deflect towards the surface of the zinc sulfide protective window 4 so as to focus the airflow to blow against the zinc sulfide protective window 4. The cylindrical mounting platform 5 is equipped with an air curtain component, which is used to provide compressed air to the jet head 6. The hollow support base 7 is equipped with a cleaning component, which is used to spray cleaning agent in the forward direction of the arc-shaped scraper 9 to dissolve oil stains.

[0037] In operation, the pipeline robot 3, carrying the inspection machine, first enters the through-hole 2 inside the stainless steel pipe. The air curtain assembly blows a 60° cone-shaped air curtain onto the outer periphery of the zinc sulfide protective window 4 through the jet nozzle 6 to disperse dust and other foreign objects falling onto the surface of the zinc sulfide protective window 4. Then, when the inspection assembly senses that the surface temperature of the zinc sulfide protective window 4 is too high, affecting the data collection of the infrared imaging module 11, the scraping assembly is activated to move the arc-shaped scraper 9 against the surface of the zinc sulfide protective window 4. This is coordinated with the cleaning assembly, which uses the arc-shaped cleaning nozzle 8 to spray water onto the arc-shaped scraper. The cleaning agent is sprayed in the forward direction of the 9 to scrape off foreign objects adhering to the zinc sulfide protective window 4. While driving the arc-shaped scraper 9 to move against the surface of the zinc sulfide protective window 4, the jet head 6 is deflected towards the surface of the zinc sulfide protective window 4 by the adjustment component. This focuses the airflow to blow against the zinc sulfide protective window 4, quickly removing the heat accumulated on the surface of the zinc sulfide protective window 4 and drying the residual moisture on the surface of the zinc sulfide protective window 4. This effectively avoids secondary interference caused by cleaning agent residue, thereby effectively improving the detection accuracy and detection efficiency of the detection component.

[0038] like Figures 2-4As shown, the detection assembly includes a detection box 10 rotatably connected to one end of the hollow support base 7 and located inside the zinc sulfide protective window 4; four infrared imaging modules 11 uniformly fixedly connected to the outer periphery of the detection box 10; a fiber laser 12 fixedly connected to the end of the detection box 10 away from the hollow support base 7; a beam splitter 13 fixedly connected to the output end of the fiber laser 12; and two temperature sensors 14 symmetrically fixedly connected to the inner side of the zinc sulfide protective window 4.

[0039] In use, when the pipeline robot 3 carrying the inspection machine enters the through hole 2 inside the stainless steel pipe, the fiber laser 12 passes through the zinc sulfide protective window 4 through the beam splitter 13 to excite the pipe wall 1, causing the pipe wall 1 to heat up. At the same time, the infrared imaging module 11 receives the thermal radiation signal of the inner surface of the pipe wall 1 to complete the detection of defects in the inner wall of the pipe wall 1. Then, when the symmetrically set temperature sensor 14 detects that the local temperature inside the zinc sulfide protective window 4 exceeds the preset threshold, it indicates that contaminants are adhered to the surface of the zinc sulfide protective window 4, causing heat accumulation to interfere with the optical path. At this time, the scraping component will be triggered to start automatically to clean the stains adhered to the surface of the zinc sulfide protective window 4.

[0040] like Figures 2-6 As shown, the scraping assembly includes four scraping grooves 16 evenly distributed around the outer periphery of the hollow support base 7, a movable rack 17 slidably connected inside the scraping grooves 16 and fixedly connected at one end to the arc-shaped cleaning nozzle 8, four transmission grooves 18 evenly distributed around the outer periphery of the hollow support base 7, a transmission slider 19 slidably connected inside the transmission grooves 18, a transmission gear 20 rotatably connected to one end of the transmission slider 19, and four fixed racks 21 evenly fixedly connected around the outer periphery of the hollow support base 7. The transmission gear 20 is located between the movable rack 17 and the fixed racks 21 and meshes synchronously with them. The extension direction of the transmission grooves 18 is parallel to the scraping grooves 16, and the length of the movable rack 17 is greater than that of the fixed racks 21. The scraping assembly includes a main gear 22 rotatably connected inside the hollow support base 7, four satellite gears 23 evenly arranged in a circular pattern inside the hollow support base 7 and meshing with the main gear 22, a transmission rod 24 fixedly connected to one end of the satellite gears 23 and rotatably connected to the hollow support base 7, a spiral groove 25 opened on the outer periphery of the transmission rod 24, a ball head rod 26 fixedly connected to the end of the transmission slider 19 away from the transmission gear 20, the ball head end of which is embedded in the spiral groove 25, a motor 27 fixedly connected inside the hollow support base 7, and a reducer 28 fixedly connected to the output end of the motor 27, with the output end of the reducer 28 coaxially fixed to the main gear 22.

[0041] In use, when the scraping assembly is activated to automatically clean the stains adhering to the surface of the zinc sulfide protective window 4, the starting motor 27 drives the main gear 22 to rotate through the reducer 28, which in turn drives the four satellite gears 23 to rotate synchronously. The satellite gears 23 push the ball head rod 26 through the spiral groove 25 of the transmission rod 24, causing the transmission slider 19 to move along the transmission groove 18. Under the meshing transmission of the moving rack 17 and the fixed rack 21, the transmission gear 20 drives the arc-shaped scraper 9 to move axially along the zinc sulfide protective window 4 to scrape the contaminants. At the same time, the cleaning assembly is activated. The cooperation between the transmission gear 20 and the moving rack 17 and the fixed rack 21 allows the arc-shaped scraper 9 to move more than twice the travel distance of the transmission gear 20 along the length of the transmission groove 18, thereby increasing the scraping range of the arc-shaped scraper 9.

[0042] like Figures 2-4 and Figure 7 , Figure 8 As shown, the adjustment assembly includes a fixed plate 29 fixedly connected to the end of the cylindrical mounting platform 5 facing the zinc sulfide protective window 4; four fixed grooves 30 evenly opened at one end of the fixed plate 29; an adjustment rack 31 slidably connected inside the fixed grooves 30; four incomplete gears 32 evenly hinged to the side of the fixed plate 29 facing the zinc sulfide protective window 4 and fixedly connected at one end to the jet head 6; an annular air chamber 33 opened inside the fixed plate 29 and connected to the jet head 6 through a pipe; and a return spring 34 fixedly connected to one end of the adjustment rack 31 and located inside the fixed grooves 30. The adjustment assembly also includes an abutment wheel 35 rotatably connected to one end of the adjustment rack 31. The air curtain assembly includes a micro air compressor 39 fixedly connected to the end of the beam splitter 13 and passing through the fixed plate 29 and rotatably connected to it; four triangular protrusions 37 uniformly fixedly connected to the outer periphery of the micro air compressor 36, whose inclined surface rolls against the contact wheel 35; an external gear ring 38 fixedly connected to one end of the detection box 10 and meshing with the satellite gear 23; and the air curtain assembly includes a micro air compressor 39 fixedly connected to the inside of the cylindrical mounting platform 5; a filter 40 fixedly connected to the air inlet of the micro air compressor 39 and whose input end extends to the outside of the cylindrical mounting platform 5; and four vortex tubes 41 uniformly fixedly connected to the output end of the micro air compressor 39 and whose output end communicates with the inside of the fixed plate 29.

[0043] In operation, the miniature air compressor 39 is first started, compressing the filtered gas through the filter 40 and introducing it into the annular air chamber 33 through the vortex tube 41. The filter 40 is a multi-stage air filter with an accuracy of ≤0.3μm (e.g., SMC-AFM30-10-B type). Its input end is connected to an external air source, and its output end is connected to the air inlet of the miniature air compressor 39. Then, the jet head 6 is connected to the annular air chamber 33 through a pipe, guiding the pressurized gas to blow towards the outer periphery of the zinc sulfide protective window 4. Then, while driving the arc-shaped scraper 9 to move, The outer gear ring 38 drives the detection box 10 to rotate, and the I-shaped wheel 36 drives the triangular protrusion 37 to push the contact wheel 35, forcing the adjusting rack 31 to compress the return spring 34. The adjusting rack 31 drives the incomplete gear 32 to deflect by 25°, so that the jet head 6 switches from the initial 60° outward expansion cone angle to a 15° inward tilt angle. The airflow mode switches from the annular protective air curtain to a high-speed wind close to the window. At the same time, the vortex tube 41 reduces the temperature of the pressurized gas generated by the micro air compressor 39 and makes the low-temperature airflow closely follow the surface of the zinc sulfide protective window 4 to blow away the accumulated heat and dry the residual cleaning agent.

[0044] like Figure 2 and Figure 3 , Figure 5 , Figure 9 As shown, the cleaning assembly includes an infusion tube 42 fixedly connected to the input end of the arc-shaped cleaning nozzle 8, a liquid storage chamber 43 and an installation chamber 44 opened inside the hollow support base 7, and a water pump 45 fixedly connected inside the installation chamber 44 with its input end extending into the liquid storage chamber 43. The cleaning assembly also includes four sets of storage grooves 46 opened on the outer periphery of the hollow support base 7, a storage slider 47 slidably connected inside the storage grooves 46, a T-shaped guide rod 48 fixedly connected to the top of the storage slider 47, a storage spring 49 fixedly connected inside the storage grooves 46 with one end connected to the storage slider 47, and T-shaped positioning rods 50 evenly fixedly connected to the outer periphery of the hollow support base 7. The middle section of the infusion tube 42 is S-shaped and passes around the outer periphery of the T-shaped guide rod 48.

[0045] During use, while the arc-shaped scraper 9 moves axially along the zinc sulfide protective window 4 to scrape off contaminants, the water pump 45 is started to pump the cleaning agent in the storage tank 43 into the arc-shaped cleaning nozzle 8 through the infusion pipe 42, spraying it in the forward direction of the arc-shaped scraper 9 to dissolve the oil stains. At the same time, the middle section of the infusion pipe 42 moves along the length of the receiving slide 46 with the T-shaped guide rod 48, causing the T-shaped guide rod 48 to drive the receiving slider 47 to squeeze the receiving spring 49 to extend and retract, so that the infusion pipe 42 is kept in a taut state between multiple T-shaped guide rods 48, reducing the entanglement of the infusion pipe 42. After cleaning is completed, the receiving spring 49 pushes the T-shaped guide rod 48 to automatically reset the infusion pipe 42.

[0046] The working principle of the stainless steel pipe inner hole surface defect detection machine provided by the present invention is as follows:

[0047] First, the pipeline robot 3, carrying the inspection machine, enters the through hole 2 inside the stainless steel pipe. It starts the micro air compressor 39, compresses the filtered gas through the filter 40, and inputs it into the interior of the annular air chamber 33 through the vortex tube 41. Then, the jet head 6 connects to the annular air chamber 33 through the pipe and blows an annular air curtain with a cone angle of 60° to the outer periphery of the zinc sulfide protective window 4 to disperse dust and other foreign objects falling onto the surface of the zinc sulfide protective window 4. Then, the fiber laser 12 passes through the zinc sulfide protective window 4 through the beam splitter 13 to excite the pipe wall 1, causing the pipe wall 1 to heat up. At the same time, the infrared imaging module 11 receives the thermal radiation signal of the inner surface of the pipe wall 1 to complete the detection of defects in the inner wall of the pipe wall 1. Meanwhile, the symmetrically arranged temperature sensors 14 detect that when the local temperature inside the zinc sulfide protective window 4 exceeds the preset threshold, it indicates that contaminants are adhering to the surface of the zinc sulfide protective window 4, causing heat accumulation and interfering with the optical path.

[0048] At this time, the motor 27 will start and drive the main gear 22 to rotate through the reducer 28, which will drive the four satellite gears 23 to rotate synchronously. The satellite gears 23 will push the ball head rod 26 through the spiral groove 25 of the transmission rod 24, so that the transmission slider 19 moves along the transmission groove 18. Under the meshing transmission of the moving rack 17 and the fixed rack 21, the transmission gear 20 will drive the arc-shaped scraper 9 to move along the axial direction of the zinc sulfide protective window 4 to scrape the contaminants. At the same time, the water pump 45 will start and pump the cleaning agent in the storage tank 43 into the arc-shaped cleaning nozzle 8 through the infusion pipe 42, spraying it in the forward direction of the arc-shaped scraper 9 to dissolve the oil stains. At the same time, the middle section of the infusion pipe 42 will move along the length of the receiving groove 46 with the T-shaped guide rod 48, so that the T-shaped guide rod 48 will drive the receiving slider 47 to squeeze the receiving spring 49 to extend and retract, so that the infusion pipe 42 is kept in a taut state between the multiple T-shaped guide rods 48, reducing the entanglement of the infusion pipe 42.

[0049] While the drive arc scraper 9 moves, the outer gear ring 38 drives the detection box 10 to rotate, and the I-beam wheel 36 drives the triangular protrusion 37 to push the contact wheel 35, forcing the adjusting rack 31 to compress the reset spring 34. The adjusting rack 31 drives the incomplete gear 32 to deflect by 25°, so that the jet head 6 switches from the initial 60° outward expansion cone angle to a 15° inward tilt angle. The airflow mode switches from the annular protective air curtain to a high-speed wind close to the window. At the same time, the vortex tube 41 reduces the temperature of the pressurized gas generated by the micro air compressor 39 and makes the low-temperature airflow closely follow the surface of the zinc sulfide protective window 4 to blow away the accumulated heat and dry the residual cleaning agent.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A machine for detecting defects on the inner surface of stainless steel pipes, characterized in that: The stainless steel pipe includes a pipe wall (1), and an inner through hole (2) is opened in the center of the pipe wall (1). The internal hole surface defect detection machine enters the interior of the internal through hole (2) along the pipe wall (1) axially. The internal hole surface defect detection machine includes symmetrically arranged pipe robots (3), a zinc sulfide protective window (4) between two pipe robots (3), a cylindrical mounting platform (5) installed at one end of the zinc sulfide protective window (4), four jet heads (6) evenly arranged on the side of the cylindrical mounting platform (5) facing the zinc sulfide protective window (4), a hollow support base (7) fixedly connected to the other end of the zinc sulfide protective window (4), four arc-shaped cleaning nozzles (8) evenly arranged on one side of the hollow support base (7) and arranged in a circle on the outer periphery of the zinc sulfide protective window (4), and an arc-shaped scraper (9) fixedly connected to one end of the arc-shaped cleaning nozzle (8) facing the zinc sulfide protective window (4) and in contact with the outer surface of the zinc sulfide protective window (4). The zinc sulfide protective window (4) is equipped with a detection component inside, the hollow support base (7) is equipped with a scraping component inside, one end of the zinc sulfide protective window (4) is equipped with an adjustment component, the cylindrical mounting platform (5) is equipped with an air curtain component inside, and the hollow support base (7) is equipped with a cleaning component inside. The scraping assembly includes four scraping grooves (16) evenly distributed around the outer periphery of the hollow support base (7), a movable rack (17) slidably connected inside the scraping grooves (16) and fixedly connected at one end to the arc-shaped cleaning nozzle (8), four transmission grooves (18) evenly distributed around the outer periphery of the hollow support base (7), a transmission slider (19) slidably connected inside the transmission grooves (18), a transmission gear (20) rotatably connected to one end of the transmission slider (19), and four fixed racks (21) evenly fixedly connected around the outer periphery of the hollow support base (7). The transmission gear (20) is located between the movable rack (17) and the fixed racks (21) and meshes synchronously with them. The adjustment assembly includes a fixed plate (29) fixedly connected to one end of the cylindrical mounting platform (5) facing the zinc sulfide protective window (4), four fixed grooves (30) evenly opened at one end of the fixed plate (29), an adjustment rack (31) slidably connected inside the fixed grooves (30), four incomplete gears (32) evenly hinged to one side of the fixed plate (29) facing the zinc sulfide protective window (4) and fixedly connected at one end to the jet head (6), an annular air chamber (33) opened inside the fixed plate (29) and connected to the jet head (6) through a pipe, and a return spring (34) fixedly connected to one end of the adjustment rack (31) and located inside the fixed grooves (30). The cleaning assembly includes an infusion pipe (42) fixedly connected to the input end of the arc-shaped cleaning nozzle (8), a liquid storage chamber (43) and an installation chamber (44) opened inside the hollow support base (7), and a water pump (45) fixedly connected to the installation chamber (44) and whose input end extends into the liquid storage chamber (43). The cleaning assembly also includes four sets of storage grooves (46) on the outer periphery of the hollow support base (7), a storage slider (47) slidably connected inside the storage grooves (46), a T-shaped guide rod (48) fixedly connected to the top of the storage slider (47), a storage spring (49) fixedly connected inside the storage grooves (46) and connected at one end to the storage slider (47), and T-shaped positioning rods (50) evenly fixedly connected to the outer periphery of the hollow support base (7). The middle section of the infusion tube (42) is S-shaped and passes around the outer periphery of the T-shaped guide rod (48).

2. The internal hole surface defect inspection machine according to claim 1, characterized in that: The detection assembly includes a detection box (10) rotatably connected to one end of the hollow support base (7), and the detection box (10) is located inside the zinc sulfide protective window (4). Four infrared imaging modules (11) are uniformly fixedly connected to the outer periphery of the detection box (10), a fiber laser (12) is fixedly connected to the end of the detection box (10) away from the hollow support base (7), a beam splitter (13) is fixedly connected to the output end of the fiber laser (12), and two temperature sensors (14) are symmetrically fixedly connected to the inner side of the zinc sulfide protective window (4).

3. The internal hole surface defect inspection machine according to claim 1, characterized in that: The extension direction of the transmission groove (18) is parallel to the scraping groove (16), and the length of the moving rack (17) is greater than 200% of the stroke of the fixed rack (21).

4. The internal hole surface defect detection machine according to claim 2, characterized in that: The scraping assembly also includes a main gear (22) rotatably connected inside the hollow support base (7), four satellite gears (23) evenly arranged in a circular pattern inside the hollow support base (7) and meshing with the main gear (22), a transmission rod (24) fixedly connected to one end of the satellite gears (23) and rotatably connected to the hollow support base (7), a spiral groove (25) opened on the outer periphery of the transmission rod (24), a ball head rod (26) fixedly connected to the end of the transmission slider (19) away from the transmission gear (20), with its ball head end embedded in the spiral groove (25), a motor (27) fixedly connected inside the hollow support base (7), and a reducer (28) fixedly connected to the output end of the motor (27), with the output end of the reducer (28) coaxially fixed to the main gear (22).

5. The internal hole surface defect detection machine according to claim 4, characterized in that: The adjustment assembly also includes an abutment wheel (35) rotatably connected to one end of the adjustment rack (31), an I-shaped wheel (36) fixedly connected to the end of the beam splitter (13) and passing through the fixed plate (29) and rotatably connected thereto, four triangular protrusions (37) uniformly fixedly connected to the outer periphery of the I-shaped wheel (36) and whose inclined surface rolls against the abutment wheel (35), and an external gear ring (38) fixedly connected to one end of the detection box (10) and meshing with the satellite gear (23).

6. The internal hole surface defect inspection machine according to claim 1, characterized in that: The air curtain assembly includes a miniature air compressor (39) fixedly connected inside the cylindrical mounting platform (5), a filter (40) fixedly connected to the air inlet of the miniature air compressor (39) and whose input end extends to the outside of the cylindrical mounting platform (5), and four vortex tubes (41) uniformly fixedly connected to the output end of the miniature air compressor (39) and whose output end communicates with the inside of the fixed plate (29).

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