A kind of pressure tank truck manhole fillet weld magnetic memory scanning device and method

Abstract

The present application relates to the technical fields of material measurement and detection, and discloses a kind of pressure tank truck manhole fillet weld magnetic memory scanning device and method, including cylinder, tank cover and manhole, one end of the cylinder is provided with tank cover, the middle part of tank cover is provided with manhole, the one side of tank cover is located manhole center position and is equipped with large gear, the large gear is supported in the inside of manhole by limiting support, the special mechanical structure design of the present application is aimed at narrow space in tank, by the mechanical device that can enter manhole and automatically guide along fillet weld inside, directly replace the traditional mode that detection personnel hold probe to enter harsh posture operation, improve the safety and operation efficiency of detection, adopt precision mechanical stable posture mechanism, can make probe along fillet weld, automatically keep constant distance and best fitting angle with detection surface, provide fundamental guarantee for the reliability and accuracy of detection result.

Description

Technical Field

[0001] This invention relates to the field of materials testing and detection technology, specifically to a magnetic memory scanning device and method for manhole fillet welds in pressure tank trucks. Background Technology

[0002] Pressure tank trucks are special vehicles used to transport high-pressure media such as compressed gases and liquefied gases. The working pressure of the tank is usually not less than 0.1 MPa, and they fall under the category of special equipment management. They are mainly used for the safe transportation of media such as liquefied petroleum gas (LPG), liquefied natural gas (LNG), liquid ammonia, and compressed natural gas. Pressure tank trucks require regular inspections, and the fillet weld of the manhole is a key inspection area. The fillet weld of the manhole is prone to cracking, which is the result of the coupling of multiple factors such as structure, manufacturing, load, and environment. From a structural perspective, the manhole opening causes abrupt changes in the geometry of the tank, making the fillet weld area a significant stress concentration point. From a manufacturing perspective, the welding process inevitably introduces residual stress, and may cause structural degradation or microscopic defects in the heat-affected zone. From a load perspective, the tank truck is subjected to continuous vibration and road impact during operation, while the pressure of the medium inside the tank changes cyclically, causing this part to be subjected to complex alternating stress, which can easily lead to the initiation and propagation of fatigue cracks. Magnetic memory technology, as an emerging non-destructive testing method, is based on the magnetic memory of ferromagnetic materials under stress and deformation. This technology utilizes the spontaneous leakage magnetic field changes on the surface of components to locate and assess stress concentration areas and early microscopic damage. It features non-contact operation, rapid scanning, and early warning capabilities, enabling the identification of hidden damage and abnormal stress states that are difficult to detect using traditional methods. While domestic periodic inspection regulations for pressure equipment do not yet mandate magnetic memory testing, it serves as an important supplementary and early warning detection method. In practical applications, magnetic memory technology can be organically combined with traditional methods such as ultrasound and magnetic particle testing to construct a more comprehensive and three-dimensional safety assessment and early warning system. Currently, a magnetic memory probe for pipe seat fillet welds (application number 200920062421.1) is disclosed. This prior art, by adjusting the opening angle of the support rod, ensures that the probe remains perpendicular to the weld surface being inspected and easily controls the probe's lifting distance. When repeated inspections are required, it ensures consistent scanning routes, improves the accuracy of detection results, and achieves repeatability of the results.

[0003] Currently, the inspection of fillet welds (inside the tank) in manholes of pressure tank trucks generally adopts a conventional combination of "surface magnetic particle / penetrating detection" and "internal ultrasonic / radiological detection". These methods are essentially "post-inspection" and are difficult to effectively warn of early damage and stress concentration before macroscopic cracks have formed. At present, magnetic memory detection of fillet welds in manholes of tank trucks mainly relies on inspectors carrying handheld equipment to enter the tank for manual scanning. The leakage magnetic field signal of the weld area is picked up by magnetic sensors to assess the stress concentration state. However, its practical application is limited by the narrow space inside the tank. In particular, the location of the fillet weld inside the tank is special, and the inspection posture is difficult to standardize. Manual operation is prone to probe shaking and unstable lifting distance, which affects the reliability of the signal.

[0004] Secondly, when conducting magnetic memory inspection of manhole fillet welds in tank trucks, the narrow and enclosed interior space makes it extremely inconvenient for inspectors to move around. Maintaining unconventional postures such as bending over and squatting for extended periods leads to significant physical exertion and fatigue, directly impacting the continuity and focus of the inspection, thus reducing overall efficiency. Inspection requires continuous scanning along the entire circumference of the manhole fillet weld. However, in complex areas such as the bottom of the manhole, the sensor struggles to maintain a standard inspection angle and stable contact with the weld surface, resulting in incomplete coverage, decreased signal quality, and blind spots that affect data consistency. Operating on curved surfaces in confined spaces, the handheld probe is prone to uncontrollable micro-vibrations, causing fluctuations in the lift-off distance between the probe and the weld surface. Since magnetic memory signal strength and lift-off distance are highly sensitive, even micron-level distance changes can cause significant signal drift, potentially misinterpreting operational interference as defect signals or masking genuine weak stress concentration signals, leading to false alarms or missed detections. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a magnetic memory scanning device and method for manhole fillet welds in pressure tank trucks, which solves the problems of severely limited working space, harsh inspection environment, incomplete scanning coverage, degraded signal quality, blind spots, poor stability of manual operation, and susceptibility to signal interference.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a magnetic memory scanning device for fillet welds of manholes in pressure tank trucks, comprising a cylinder, a tank cover, and a manhole. A tank cover is provided at one end of the cylinder, and a manhole is provided in the middle of the tank cover. A large gear is installed on one side of the tank cover at the center of the manhole, and the large gear is limited and supported inside the manhole by a limiting bracket.

[0007] A rotating guide rod is connected to the side of the large gear. One end of the rotating guide rod is rotatably connected to the middle of the large gear, and a motor is installed on the side of the rotating guide rod. A small gear is connected to the output end of the motor on the side of the rotating guide rod. The small gear and the large gear are connected by meshing teeth. An adjusting frame is slidably sleeved on the top outer side of the rotating guide rod. An adjusting guide rod is connected to the side of the adjusting frame, and a sensor is embedded in the inner side of the adjusting guide rod. The sensor is configured to adjust the radial distance and detection angle of the sensor relative to the fillet weld, so that the sensor maintains a constant lift-off distance and ideal detection angle from the weld surface during circumferential motion.

[0008] In a preferred embodiment of the present invention, the rotating guide rod is rotatably connected to the center of the large gear via a bearing seat, and the motor is fixedly installed on the side of the rotating guide rod, driving the small gear to rotate.

[0009] As a preferred embodiment of the present invention, the adjusting frame has a through groove inside, the rotating guide rod is located in the through groove, and a limit bolt is provided at one end of the adjusting frame. The adjusting guide rod has a horizontal groove inside, the sensor is embedded and connected in the horizontal groove, and the side of the adjusting guide rod has an elongated hole, the side of the sensor is connected in the elongated hole by a locking bolt.

[0010] As a preferred technical solution of the present invention, a hydraulic drive box is fixedly installed on one side of the large gear, the limiting bracket is installed on the side of the hydraulic drive box, and an end cover is fixedly installed on the side of the hydraulic drive box. Both the hydraulic drive box and the end cover are made of magnetically insulating material. A turntable is rotatably connected to the inside of the hydraulic drive box. Three sets of drive blades are installed at equal angles along the circumferential direction on the side of the turntable. Drive magnetic blocks are provided on the side of the drive blades.

[0011] The hydraulic drive box has an installation groove along the circumferential direction on its inner side edge. An electric drive magnet is installed on the inner inclined wall of the installation groove. A square tube is fixedly installed on the side edge of the limiting bracket. A through hole is opened on the side edge of the hydraulic drive box corresponding to the square tube. A drive plug plate is embedded and slidably connected to the inner side of the square tube. A drive rod is connected to the end of the drive plug plate. The drive rod is slidably connected to the end of the limiting bracket, and a support arc plate is connected to the end of the drive rod.

[0012] The bottom of the hydraulic drive box is connected to an adjusting pump via a connecting pipe. One end of the adjusting pump is connected to the hydraulic fluid storage box via a transfer pipe to adjust the pressure and flow rate of the hydraulic fluid. Through hydraulic synchronous drive, each supporting arc plate simultaneously abuts against the inner wall of the manhole.

[0013] As a preferred technical solution of the present invention, the hydraulic drive box is filled with hydraulic fluid, which accounts for three-quarters of its internal volume. In the initial state, the hydraulic fluid is evenly distributed in the space separated by three sets of drive blades inside the hydraulic drive box. The turntable is rotatably connected to the end cover through a shaft seat.

[0014] The mounting spurs are provided in twelve sets. The electric drive magnets drive the drive magnetic blocks and drive blades to deflect based on electromagnetic repulsion. The electric drive magnets and drive magnetic blocks are arranged parallel to each other on opposite sides.

[0015] As a preferred embodiment of the present invention, the driving plug plate slides closely against the inner wall of the square tube, the square tube is connected to the inside of the hydraulic drive box through the through hole, the end of the limiting bracket is set in an L shape, the driving rod passes through the end of the limiting bracket and connects to the supporting arc plate, and the side of the supporting arc plate is provided with anti-slip rubber.

[0016] As a preferred technical solution of the present invention, an installation plate is installed on the other side of the large gear at the center of the inner side of the cylinder. Three sets of telescopic brackets are connected at equal angles along the circumferential direction at the edge of the installation plate. A drive seat is fixedly installed at the end of the telescopic bracket, and a drive track is embedded in the inner side of the drive seat. A servo motor that drives the drive track is installed on the side of the drive seat.

[0017] An electric push rod is fixedly installed on the side of the telescopic bracket, and the telescopic end of the electric push rod is stably attracted and limited to the edge of the large gear by an adsorption magnetic block.

[0018] The drive seat has a support tube at one end, and a buffer spring is installed inside the support tube. A support rod is connected to the end of the buffer spring at the inner side of the support tube. A sleeve is provided at the end of the support rod, and a contact switch is installed on the inner side of the sleeve. An abutment is slidably connected to one side of the sleeve.

[0019] As a preferred technical solution of the present invention, the telescopic bracket consists of an internal telescopic groove, a telescopic rod that slides inside the telescopic groove, and a locking bolt on the side. The telescopic rod is slidably connected in the telescopic groove, and the locking bolt limits the telescopic rod to the inside of the telescopic bracket.

[0020] The drive track is an anti-slip track, and the side of the drive track is in close contact with the inner wall of the cylinder.

[0021] As a preferred embodiment of the present invention, the support rod slides along the inner wall of the support tube, a flexible sponge pad is provided at the end of the abutment near the contact switch, and anti-slip texture is provided at the sliding contact position between the edge of the abutment and the sleeve, and the electric push rod and the magnetic adsorption block are both controlled based on the contact switch.

[0022] A scanning method for a magnetic memory scanning device for manhole fillet welds in pressure tank trucks includes the following steps:

[0023] Step 1: A drive mechanism consisting of a telescopic bracket, a drive base, drive tracks, and a servo motor is used to move the scanning device along the inside of the cylinder, thereby enabling the scanning device to be pushed in and installed.

[0024] Step two: The scanning device is moved and positioned inside the cylinder by means of the contact switch and the abutment, and the drive mechanism is separated from the scanning device.

[0025] Step 3: The scanning device is then installed onto the inner wall of the manhole using a limiting bracket to ensure that the installation position of the large gear corresponds to the center of the cylinder.

[0026] Step 4: Adjust the position of the sensor before scanning and inspection to adjust the distance between the sensor and the fillet weld and the inspection angle.

[0027] Step 5: Move the sensor of the scanning device along the circumference of the manhole to scan, maintaining a constant lifting distance and ideal detection angle between the sensor and the weld surface.

[0028] Compared with the prior art, the present invention provides a magnetic memory scanning device and method for manhole fillet welds in pressure tank trucks, which has the following beneficial effects:

[0029] 1. A mechanical device, consisting of a large gear, a limiting bracket, a rotating guide rod, a motor, a small gear, an adjusting frame, an adjusting guide rod, and a sensor, is constructed to automatically guide the sensor along the manhole fillet weld, eliminating the need for manual probe handling in adverse conditions. This significantly reduces physical exertion, labor intensity, and improves accessibility and safety. The meshing transmission of the large and small gears facilitates the synchronous displacement of the adjusting frame and guide rod, allowing the sensor to automatically maintain a constant lift-off distance and ideal detection angle from the weld surface. This eliminates blind spots, provides stable and consistent signals, ensures a standard detection posture, and guarantees the integrity and reliability of the detection. Stable mechanical movement replaces manual operation, eliminating human error and fundamentally preventing lift-off distance fluctuations caused by hand tremors. It also significantly reduces signal noise introduced by operational interference. Through integrated innovation of technology and tools, this device solves the core challenges of operability, stability, and reliability in current magnetic memory detection of manhole fillet welds in tank trucks, providing an effective tool for more efficient and accurate safety early warning assessment of this area.

[0030] 2. By rotating the guide rod around the center of the large gear, the motor drives the small gear to rotate, causing the small gear to move in a circle around the large gear, thus improving the stability of the movement. The adjustment frame slides along the rotating guide rod, making it easy to adjust the position of the sensor according to the diameter of the manhole. At the same time, combined with the adjustment guide rod at the end of the adjustment frame, the sensor can be adjusted and connected inside the adjustment guide rod, making it easy to adjust the distance of the sensor from the fillet weld and the detection angle, ensuring more accurate detection results. Through adjustment, the sensor automatically maintains a constant lift-off distance during the movement along the curved weld, eliminating signal noise caused by lift-off distance fluctuations and improving the signal-to-noise ratio of the magnetic memory detection signal.

[0031] In summary, the specialized mechanical structure design for the confined space inside the tank enables mechanized replacement of human labor for inspection. Through a mechanical device that can enter the manhole and automatically guide along the fillet weld inside, it directly replaces the traditional mode of inspection personnel holding probes and entering into adverse positions to work, greatly reducing the physical exertion and operational risks of inspection personnel, and significantly improving the safety and efficiency of inspection.

[0032] Employing a precision mechanical stabilization mechanism, the probe automatically maintains a constant distance and optimal contact angle with the detection surface when moving along fillet welds, especially the complex curved surface at the bottom of manholes. This achieves stable scanning at a constant distance and ideal angle, completely eliminating detection blind spots and signal fluctuations, and providing a fundamental guarantee for the reliability and accuracy of the detection results.

[0033] By completely replacing manual operation with stable mechanical motion, the random fluctuations in lifting distance caused by unstable probe handling are fundamentally eliminated, greatly improving the repeatability of detection data and enabling the signal to reflect the state of the weld more realistically and purely.

[0034] 3. By setting up a turntable, drive blade, drive magnetic block, mounting slant and electric drive magnet in the hydraulic drive box, the turntable and drive blade rotate in the hydraulic drive box based on the magnetic repulsion of the electric drive magnet and drive magnetic block. The drive blade squeezes the hydraulic fluid on its side, so that the hydraulic fluid enters the square tube through the guide hole. Based on the hydraulic pressure, the drive plug plate is moved in the square tube, so that the drive rod drives the supporting arc plate at its end to stick tightly to the inner wall of the manhole. Furthermore, the hydraulic fluid in the hydraulic drive box is regulated by the regulating pump and the transfer pipe to ensure that the drive blade squeezes the hydraulic fluid accurately.

[0035] Based on the hydraulic synchronous drive, the three sets of supporting arc plates on the side of the hydraulic drive box are moved synchronously under the drive rod, so that the three sets of supporting arc plates contact the inner wall of the manhole at the same time. This ensures that the installation position of the hydraulic drive box and the large gear can be exactly located in the center of the cylinder, improves the accuracy of the scanning device's trajectory when running along the fillet weld, and avoids misalignment of the large gear's installation position, which would cause the scanning trajectory to deviate and affect the scanning results.

[0036] 4. The telescopic bracket, drive base, drive track and servo motor on the side of the mounting plate form a drive mechanism to move the scanning device along the inside of the cylinder. The telescopic bracket is adjusted to ensure that the drive track fits against the inner wall of the cylinder. Using electric push rod and magnetic adsorption block, the large gear and mounting plate are temporarily integrated into a whole structure based on magnetic adsorption, which facilitates the drive mechanism to move the scanning device and replaces the inspection personnel to enter the cylinder to install the scanning device in harsh environments.

[0037] Meanwhile, based on the support tube, buffer spring, support rod, sleeve, contact switch, and abutment, the abutment contacts the can cover at the end of the cylinder, causing the abutment to contact the contact switch under pressure, thus opening the contact switch. At the same time, the magnetic block closes and the electric push rod opens. By releasing the limit switch, the large gear separates from the drive mechanism. Simultaneously, the electric push rod retracts, causing the contact switch to move, preventing the drive mechanism from affecting the subsequent circumferential scanning movement of the scanning device. This achieves automatic positioning and convenient installation of the scanning device, replacing the need for inspection personnel to carry probes into harsh working environments, reducing the operational risks for inspection personnel, and improving safety. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of the present invention.

[0039] Figure 2 This is a schematic diagram of the structure of the can lid of the present invention.

[0040] Figure 3 This is a side view of the can lid of the present invention.

[0041] Figure 4 This is a schematic diagram of the structure of the large gear of the present invention.

[0042] Figure 5 This is a schematic diagram of the rotating guide rod of the present invention.

[0043] Figure 6 This is a schematic diagram of the hydraulic drive box of the present invention.

[0044] Figure 7 This is a schematic diagram of the internal structure of the hydraulic drive box of the present invention.

[0045] Figure 8 This is a schematic diagram of the distribution of the driving blades of the present invention.

[0046] Figure 9 This is a schematic diagram of the installation disk of the present invention.

[0047] Figure 10 This is a schematic diagram of the internal structure of the support tube of the present invention.

[0048] Figure 11 This is a flowchart of the scanning method of the present invention.

[0049] In the diagram: 1. Cylinder; 2. Tank lid; 3. Manhole; 4. Large gear; 5. Limiting bracket; 6. Rotating guide rod; 7. Motor; 8. Small gear; 9. Adjusting frame; 10. Adjusting guide rod; 11. Sensor; 12. Hydraulic drive box; 13. End cover; 14. Turntable; 15. Drive blade; 16. Drive magnet; 17. Mounting slant; 18. Electric drive magnet; 19. Through hole; 20. Square tube; 21. Drive plug plate; 22. Drive rod; 23. Support arc plate; 24. Adjusting pump; 25. Adapter pipe; 26. Mounting plate; 27. Telescopic bracket; 28. Drive seat; 29. ​​Drive track; 30. Servo motor; 31. Electric push rod; 32. Adsorption magnet; 33. Support tube; 34. Buffer spring; 35. Support rod; 36. Sleeve; 37. Contact switch; 38. Abutment joint. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0051] In the description of this invention, it should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to the other element.

[0052] In the description of this invention, it should be noted that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not 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 the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0053] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0054] Example: Please refer to Figures 1-10 The present invention provides the following technical solution: a magnetic memory scanning device for the fillet weld of the manhole of a pressure tanker truck, comprising a cylinder 1, a tank cover 2 and a manhole 3. The tank cover 2 is provided at one end of the cylinder 1, and the manhole 3 is provided in the middle of the tank cover 2. A large gear 4 is installed on one side of the tank cover 2 at the center of the manhole 3. The large gear 4 is limited and supported on the inner side of the manhole 3 by a limiting bracket 5. The limiting bracket 5 is based on hydraulic synchronous drive, so that the supporting arc plate 23 abuts against the inner wall of the manhole 3.

[0055] A rotating guide rod 6 is connected to the side of the large gear 4. One end of the rotating guide rod 6 is rotatably connected to the middle of the large gear 4, and a motor 7 is installed on the side of the rotating guide rod 6. A small gear 8 is connected to the side of the rotating guide rod 6 corresponding to the output end of the motor 7. The rotating guide rod 6 is rotatably connected to the center of the large gear 4 through a bearing seat. The motor 7 is fixedly installed on the side of the rotating guide rod 6. The motor 7 drives the small gear 8 to rotate, facilitating the rotation of the rotating guide rod 6. The small gear 8 and the large gear 4 are connected through gear meshing. An adjusting frame 9 is slidably sleeved on the top outer side of the rotating guide rod 6. An adjusting guide rod 10 is connected to the side of the adjusting frame 9, and a sensor is embedded in the inner side of the adjusting guide rod 10. Device 11 is configured to adjust the radial distance and detection angle of sensor 11 relative to the fillet weld, so that sensor 11 maintains a constant lift-off distance and ideal detection angle from the weld surface during circumferential motion. Sensor 11 is a magnetic memory sensor. The adjustment frame 9 has a through groove, the rotating guide rod 6 is located in the through groove, and a limit bolt is provided at one end of the adjustment frame 9. The adjustment guide rod 10 has a transverse groove, and sensor 11 is embedded and connected in the transverse groove. The side of the adjustment guide rod 10 has an elongated hole, and the side of sensor 11 is connected in the elongated hole by a locking bolt. The distance of sensor 11 from the fillet weld and the detection angle are adjusted to ensure more accurate detection results.

[0056] A hydraulic drive box 12 is fixedly installed on one side of the large gear 4. A limit bracket 5 is installed on the side of the hydraulic drive box 12, and an end cover 13 is fixedly installed on the side of the hydraulic drive box 12. Both the hydraulic drive box 12 and the end cover 13 are made of magnetic insulating material, specifically glass fiber. Magnetic insulation is achieved through the glass fiber hydraulic drive box 12 and end cover 13, resulting in high overall strength. At the same time, it prevents magnetic field lines from penetrating the hydraulic drive box 12 and end cover 13, preventing the magnetic repulsion between the electric drive magnet 18 and the drive magnetic block 16 inside the hydraulic drive box 12 from affecting subsequent magnetic memory detection and avoiding deviations in the detection results. A turntable 14 is rotatably connected inside the hydraulic drive box 12. Three sets of drive blades 15 are installed at equal angles along the circumferential direction on the side of the turntable 14. Drive magnetic blocks 16 are provided on the side of the drive blades 15.

[0057] The inner side of the hydraulic drive box 12 is provided with a mounting groove 17 along the circumferential direction. An electric drive magnet 18 is installed on the inner inclined wall of the mounting groove 17. The electric drive magnet 18 drives the turntable 14 to rotate through electromagnetic repulsion, causing the drive blade 15 to squeeze the hydraulic fluid to generate synchronous pressure. There are twelve sets of mounting grooves 17. The electric drive magnet 18 pushes the drive magnetic block 16 and the drive blade 15 to deflect based on electromagnetic repulsion. The opposite sides of the electric drive magnet 18 and the drive magnetic block 16 are arranged parallel to each other so that the electric drive magnet 18 drives the drive magnetic block 16 to deflect through magnetic repulsion, so that the drive blade 15 squeezes the hydraulic fluid. A square tube 20 is fixedly installed on the side of the limiting bracket 5. A conductive part is opened on the side of the hydraulic drive box 12 corresponding to the square tube 20. A drive plug plate 21 is embedded and slidably connected to the inner side of the square tube 20 through hole 19. A drive rod 22 is connected to the end of the drive plug plate 21. The drive rod 22 is slidably connected to the end of the limiting bracket 5 and the end of the drive rod 22 is connected to the supporting arc plate 23. The drive plug plate 21 slides tightly against the inner wall of the square tube 20. The square tube 20 is connected to the inside of the hydraulic drive box 12 through the through hole 19. The end of the limiting bracket 5 is set to L-shaped. The drive rod 22 passes through the end of the limiting bracket 5 and is connected to the supporting arc plate 23. The side of the supporting arc plate 23 is provided with anti-slip rubber. Under hydraulic drive, the drive plug plate 21 slides along the square tube 20 to drive the drive rod 22 to move, so that the supporting arc plate 23 is attached to the inner wall of the cylinder 1.

[0058] The bottom of the hydraulic drive box 12 is connected to a regulating pump 24 via a connecting pipe. One end of the regulating pump 24 is connected to the hydraulic fluid storage box via a transfer pipe 25 to regulate the pressure and flow of the hydraulic fluid. Through hydraulic synchronous drive, each supporting arc plate 23 simultaneously abuts against the inner wall of the manhole 3, realizing automatic alignment between the large gear 4 and the manhole 3. This facilitates the regulation and delivery of the hydraulic fluid. The hydraulic drive box 12 is filled with hydraulic fluid, which is hydraulic oil, and is initially evenly distributed within the space separated by three sets of drive blades 15 inside the hydraulic drive box 12. The turntable 14 is rotatably connected to the end cover 13 via a shaft seat to regulate the hydraulic fluid in the hydraulic drive box 12, facilitating replenishment and temporary storage and transfer. This allows the drive blades 15 to stably squeeze the hydraulic fluid, aligning the central axis of the large gear 4 with the central axis of the manhole 3, ensuring the accuracy of the trajectory of the sensor 11 moving along the fillet weld.

[0059] On the other side of the large gear 4, at the center of the inner side of the cylinder 1, there is an installation plate 26. Three sets of telescopic brackets 27 are connected at equal angles along the circumferential direction at the edge of the installation plate 26. The end of the telescopic bracket 27 is fixedly installed with a drive seat 28, and a drive track 29 is embedded in the inner side of the drive seat 28. The drive track 29 is an anti-slip track, and the side of the drive track 29 is in close contact with the inner wall of the cylinder 1, so that the drive track 29 drives the installation plate 26 to move stably along the inner wall of the cylinder 1. The telescopic bracket 27 consists of a telescopic groove inside it, a telescopic rod sliding inside the telescopic groove, and a locking bolt on the side. The telescopic rod is slidably connected in the telescopic groove, and the locking bolt limits the telescopic rod inside the telescopic bracket 27, so that the drive track 29 can be adjusted to fit the inner wall of the cylinder 1. A servo motor 30 that drives the drive track 29 is installed on the side of the drive seat 28.

[0060] An electric push rod 31 is fixedly installed on the side of the telescopic bracket 27. The telescopic end of the electric push rod 31 is stably attracted and limited to the side of the large gear 4 by the magnetic adsorption block 32.

[0061] A support tube 33 is provided at the edge of the drive seat 28, and a buffer spring 34 is installed inside the support tube 33. A support rod 35 is connected to the end of the buffer spring 34 at the position inside the support tube 33. A sleeve 36 is provided at the end of the support rod 35, and a contact switch 37 is installed on the inner edge of the sleeve 36. An abutment 38 is slidably connected to one side of the sleeve 36. The support rod 35 slides along the inner wall of the support tube 33. A flexible sponge pad is provided at the end of the abutment 38 near the contact switch 37, and the edge of the abutment 38 slides against the sleeve 36. The device is equipped with anti-slip texture. Both the electric push rod 31 and the magnetic adsorption block 32 are controlled by the contact switch 37. The contact joint 38 contacts the contact switch 37 under pressure. The contact switch 37 is opened to close the magnetic adsorption block 32 and open the electric push rod 31, so that the large gear 4 is separated from the drive mechanism. The electric push rod 31 drives the contact switch 37 to move, so that the magnetic adsorption block 32 is de-energized and demagnetized and the electric push rod 31 is retracted, so as to realize the automatic separation of the mounting plate 26 and the large gear 4, so as to drive the scanning device to move along the inner wall of the cylinder 1 to the manhole 3 and automatically separate.

[0062] Please see Figure 11 A scanning method for a magnetic memory scanning device for manhole fillet welds in pressure tank trucks includes the following steps:

[0063] Step 1: The scanning device is moved along the inside of the cylinder 1 by a drive mechanism consisting of telescopic bracket 27, drive base 28, drive track 29 and servo motor 30, so as to push the scanning device in for installation.

[0064] Step 2: The scanning device is moved and positioned inside the cylinder 1 by means of contact switch 37 and abutment joint 38, and the drive mechanism is separated from the scanning device.

[0065] Step 3: The scanning device is further synchronously and centered on the inner wall of the manhole 3 by using the limiting bracket 5, so that the installation position of the large gear 4 corresponds to the center of the cylinder 1.

[0066] Step 4: Adjust the position of sensor 11 before scanning and inspection to adjust the distance of sensor 11 from the fillet weld and the inspection angle.

[0067] Step 5: Move the sensor 11 of the scanning device along the circumference of the manhole 3 to scan, maintaining a constant lifting distance and ideal detection angle between the sensor 11 and the weld surface.

[0068] The working principle and usage process of this invention are as follows: First, the scanning device needs to be pushed into the cylinder 1. The telescopic bracket 27, drive seat 28, drive track 29 and servo motor 30 on the side of the mounting plate 26 form a drive mechanism to drive the scanning device to move along the inside of the cylinder 1. The telescopic bracket 27 is adjusted so that the drive track 29 fits against the inner wall of the cylinder 1. Using the electric push rod 31 and the magnetic block 32, when the scanning device is pushed in, the large gear 4 and the mounting plate 26 can be temporarily assembled into an integral structure based on magnetic adsorption, so that the drive mechanism drives the scanning device to move along the inner wall of the cylinder 1.

[0069] When the drive mechanism moves the scanning device along the inside of the cylinder 1 to its position, when the large gear 4 moves to the installation position, the abutment 38 contacts the can cover 2. Under pressure, the abutment 38 contacts the contact switch 37, causing the contact switch 37 to open. At the same time, the magnetic adsorption block 32 is closed and the electric push rod 31 is opened, releasing the temporary limit of the large gear 4 and the mounting plate 26, so that the large gear 4 is separated from the drive mechanism. The electric push rod 31 drives the contact switch 37 to move, so that the drive mechanism will not affect the subsequent circumferential scanning movement of the scanning device. After the magnetic adsorption block 32 is de-energized, it will not generate magnetic force to affect the subsequent magnetic memory detection.

[0070] After the scanning device is pushed to the corresponding installation position inside the cylinder 1, it needs to be installed on the inner wall of the manhole 3 through the limiting bracket 5. When the scanning device is installed inside the cylinder 1 through the limiting bracket 5, the electric drive magnet 18 is activated. Based on the magnetic repulsion between the electric drive magnet 18 and the drive magnetic block 16, the drive turntable 14 drives the drive blade 15 to rotate in the hydraulic drive box 12. The drive blade 15 squeezes the hydraulic fluid on its side, so that the hydraulic fluid enters the square tube 20 through the guide hole 19. Based on the hydraulic pressure, the drive plug plate 21 is moved in the square tube 20, so that the drive rod 22 drives the supporting arc plate 23 at its end to stick tightly to the inner wall of the manhole 3. Based on the regulating pump 24 and the transfer pipe 25, the hydraulic fluid in the hydraulic drive box 12 is regulated. By replenishing and temporarily transferring, the drive blade 15 is ensured to stably squeeze the hydraulic fluid.

[0071] The hydraulic drive causes the three sets of supporting arc plates 23 to move synchronously under the drive rod 22, so that the three sets of supporting arc plates 23 can contact the inner wall of the manhole 3 at the same time, ensuring that the position of the large gear 4 after installation is exactly at the center of the cylinder 1.

[0072] Before scanning and testing with the scanning device, the position of sensor 11 needs to be adjusted. The position of sensor 11 is adjusted according to the diameter of manhole 3 by sliding the adjustment frame 9 along the rotating guide rod 6. The sensor 11 is adjustablely connected to the adjustment guide rod 10 at the end of the adjustment frame 9 so as to adjust the distance of sensor 11 from fillet weld and the detection angle.

[0073] During the scanning and testing process, the motor 7 is started to drive the pinion 8 to rotate. Based on the meshing action between the pinion 8 and the large gear 4, the pinion 8, motor 7, and rotating guide rod 6 rotate synchronously along the large gear 4. The rotating guide rod 6 drives the sensor 11 to move, automatically maintaining a constant lift-off distance and ideal detection angle from the weld surface. The lift-off distance is the vertical distance between the detection surface of the magnetic memory sensor and the weld surface, eliminating the detection blind zone, obtaining a stable and consistent signal, and realizing the scanning test. Data is recorded after one week of testing.

[0074] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A magnetic memory scanning device for fillet welds of manholes in pressure tank trucks, comprising a cylinder (1), a tank cover (2), and a manhole (3), characterized in that: One end of the cylinder (1) is provided with a can lid (2), and a manhole (3) is provided in the middle of the can lid (2). A large gear (4) is installed on one side of the can lid (2) at the center of the manhole (3). The large gear (4) is limited and supported on the inside of the manhole (3) by a limiting bracket (5). The large gear (4) is connected to a rotating guide rod (6) on its side. One end of the rotating guide rod (6) is rotatably connected to the middle of the large gear (4), and a motor (7) is installed on the side of the rotating guide rod (6). A small gear (8) is connected to the output end of the motor (7) on the side of the rotating guide rod (6). The small gear (8) and the large gear (4) are connected by gear teeth meshing. An adjustment frame (9) is slidably sleeved on the top outer side of the rotating guide rod (6). An adjustment guide rod (10) is connected to the side of the adjustment frame (9), and a sensor (11) is embedded in the inner side of the adjustment guide rod (10). The sensor (11) is configured to adjust the radial distance and detection angle of the sensor (11) relative to the fillet weld, so that the sensor (111) maintains a constant lifting distance and ideal detection angle from the weld surface during the circumferential motion.

2. The magnetic memory scanning device for manhole fillet welds of pressure tank trucks according to claim 1, characterized in that: The rotating guide rod (6) is rotatably connected to the center of the large gear (4) through the bearing seat, and the motor (7) is fixedly installed on the side of the rotating guide rod (6). The motor (7) drives the small gear (8) to rotate.

3. The magnetic memory scanning device for manhole fillet welds of pressure tank trucks according to claim 1, characterized in that: The adjustment frame (9) has a through groove inside, the rotating guide rod (6) is located in the through groove, and a limit bolt is provided at one end of the adjustment frame (9). The adjustment guide rod (10) has a horizontal groove inside, and the sensor (11) is embedded in the horizontal groove. The adjustment guide rod (10) has a long waist hole on its side, and the side of the sensor (11) is connected to the long waist hole by a locking bolt.

4. The magnetic memory scanning device for fillet welds in manholes of pressure tank trucks according to claim 1, characterized in that: A hydraulic drive box (12) is fixedly installed on one side of the large gear (4). The limiting bracket (5) is installed on the side of the hydraulic drive box (12). An end cover (13) is fixedly installed on the side of the hydraulic drive box (12). Both the hydraulic drive box (12) and the end cover (13) are made of magnetic insulating material. A turntable (14) is rotatably connected inside the hydraulic drive box (12). Three sets of drive blades (15) are installed at equal angles along the circumferential direction on the side of the turntable (14). A drive magnetic block (16) is provided on the side of the drive blade (15). The hydraulic drive box (12) has an installation groove (17) on its inner side edge along the circumferential direction. An electric drive magnet (18) is installed on the inner inclined wall of the installation groove (17). A square tube (20) is fixedly installed on the side end of the limiting bracket (5). A through hole (19) is opened on the side of the hydraulic drive box (12) corresponding to the square tube (20). A drive plug plate (21) is embedded and slidably connected to the inner side of the square tube (20). A drive rod (22) is connected to the end of the drive plug plate (21). The drive rod (22) is slidably connected to the end of the limiting bracket (5), and a supporting arc plate (23) is connected to the end of the drive rod (22). The bottom of the hydraulic drive box (12) is connected to an adjusting pump (24) via a connecting pipe. One end of the adjusting pump (24) is connected to the hydraulic fluid storage box via a transfer pipe (25) to adjust the pressure and flow of the hydraulic fluid. Through hydraulic synchronous drive, each supporting arc plate (23) simultaneously abuts against the inner wall of the manhole (3).

5. A magnetic memory scanning device for fillet welds in manholes of pressure tank trucks according to claim 4, characterized in that: The hydraulic drive box (12) is filled with three-quarters of its internal space volume of hydraulic fluid, and the hydraulic fluid is evenly distributed in the space inside the hydraulic drive box (12) separated by three sets of drive blades (15) in the initial state. The turntable (14) is rotatably connected to the end cover (13) through the shaft seat. The mounting groove (17) is provided with twelve sets. The electric drive magnet (18) drives the drive magnetic block (16) and drive blade (15) to deflect based on electromagnetic repulsion. The electric drive magnet (18) and the drive magnetic block (16) are arranged in parallel on opposite sides.

6. The magnetic memory scanning device for fillet welds in manholes of pressure tank trucks according to claim 4, characterized in that: The drive plate (21) slides tightly against the inner wall of the square tube (20). The square tube (20) is connected to the inside of the hydraulic drive box (12) through the through hole (19). The end of the limiting bracket (5) is set in an L shape. The drive rod (22) passes through the end of the limiting bracket (5) and connects to the supporting arc plate (23). The side of the supporting arc plate (23) is provided with anti-slip rubber.

7. The magnetic memory scanning device for manhole fillet welds of pressure tank trucks according to claim 1, characterized in that: On the other side of the large gear (4), an installation plate (26) is installed at the center of the inner side of the cylinder (1). Three sets of telescopic brackets (27) are connected at equal angles along the circumferential direction at the edge of the installation plate (26). A drive seat (28) is fixedly installed at the end of the telescopic bracket (27), and a drive track (29) is embedded in the inner side of the drive seat (28). A servo motor (30) that drives the drive track (29) is installed on the side of the drive seat (28). An electric push rod (31) is fixedly installed on the side of the telescopic bracket (27). The telescopic end of the electric push rod (31) is stably attracted and limited to the side of the large gear (4) by an adsorption magnetic block (32). The drive seat (28) is provided with a support tube (33) at one end, and a buffer spring (34) is installed inside the support tube (33). The end of the buffer spring (34) is connected to a support rod (35) at the inner side of the support tube (33). The end of the support rod (35) is provided with a sleeve (36), and a contact switch (37) is installed on the inner side of the sleeve (36). An abutment (38) is slidably connected to one side of the sleeve (36).

8. A magnetic memory scanning device for fillet welds in manholes of pressure tank trucks according to claim 7, characterized in that: The telescopic bracket (27) consists of an internal telescopic groove, a telescopic rod that slides inside the telescopic groove, and a locking bolt on the side. The telescopic rod is slidably connected inside the telescopic groove, and the locking bolt limits the telescopic rod to the inside of the telescopic bracket (27). The drive track (29) is an anti-slip track, and the side of the drive track (29) is in contact with the inner wall of the cylinder (1).

9. A magnetic memory scanning device for fillet welds in manholes of pressure tank trucks according to claim 7, characterized in that: The support rod (35) slides along the inner wall of the support tube (33), and the end of the abutment (38) near the contact switch (37) is provided with a flexible sponge pad. The edge of the abutment (38) and the sliding contact position of the sleeve (36) are provided with anti-slip texture. The electric push rod (31) and the magnetic adsorption block (32) are both controlled based on the contact switch (37).

10. A scanning method for the magnetic memory scanning device for manhole fillet welds of pressure tank trucks according to any one of claims 1-9, characterized in that: Includes the following steps: Step 1: The scanning device is moved along the inside of the cylinder (1) by a drive mechanism consisting of a telescopic bracket (27), a drive seat (28), a drive track (29), and a servo motor (30) to realize the push-in installation of the scanning device; Step 2: The scanning device is moved and positioned inside the cylinder (1) by means of the contact switch (37) and the abutment (38), and the drive mechanism is separated from the scanning device. Step 3: The scanning device is further synchronously and centeredly installed on the inner wall of the manhole (3) by the limiting bracket (5), so that the installation position of the large gear (4) corresponds to the center of the cylinder (1); Step 4: Before scanning and inspection, adjust the position of the sensor (11) to adjust the distance of the sensor (11) from the fillet weld and the inspection angle. Step 5: Move the sensor (11) of the scanning device along the circumference of the manhole (3) to scan, maintaining a constant lifting distance and ideal detection angle between the sensor (11) and the weld surface.

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