Full-automatic electromagnetic ultrasonic thickness measuring device and use method thereof

Abstract

The full-automatic electromagnetic ultrasonic thickness measuring device is used for detecting the thickness of a high-temperature cast pipe, the device comprises a mounting frame and a probe arranged on the mounting frame, a pressure-bearing walking wheel is arranged on the mounting frame, the probe comprises a base body and a permanent magnet probe core, the base body is provided with two step-shaped mounting holes which are arranged in parallel at an interval, and the permanent magnet probe core is arranged in the mounting frame. The permanent magnet probe core is arranged in the mounting hole through a core sleeve and is sealed through an end cover, mounting chambers for mounting tungsten steel wheels are arranged at the side end of the base body at intervals, a kidney-shaped long hole is formed in the side end of the base body, and a guide column penetrates through the kidney-shaped long hole. Through a unique air curtain cooling system, the permanent magnet probe core and the coil are continuously and forcibly cooled, and high-temperature radiant heat is isolated from dust, so that the probe can stably work for a long time on the surface of a high-temperature cast pipe at the temperature of 200 DEG C or above, the probe is compact in structure, can be attached to the pipe end through floating installation, and can be accurately controlled by combining with accurate walking of the device, and the detection efficiency is improved. And nearly zero blind area detection from the pipe end can be realized.

Description

Technical Field

[0001] This invention relates to the field of nondestructive testing technology, and more specifically, to a fully automatic electromagnetic ultrasonic thickness measuring device and its usage method. Background Technology

[0002] In the steel metallurgical industry, the wall thickness of cast pipes (especially centrifugal cast pipes) is one of the key quality indicators, requiring 100% online inspection. Currently, ultrasonic thickness measurement technology based on piezoelectric transducers is widely used, but it has the following inherent drawbacks:

[0003] Traditional piezoelectric ultrasonic thickness measurement requires a liquid coupling agent (such as water) to conduct sound waves, which is not suitable for high-temperature cast pipes, and the consistency of the coupling agent can easily introduce measurement errors. While existing electromagnetic ultrasonic technology is non-contact, its temperature resistance limit is usually no more than 120°C, which cannot meet the testing requirements of cast pipes at higher temperatures (such as above 200°C).

[0004] Secondly, the detection blind zone is large: due to the limitations of the probe body structure, it is impossible to detect the end area of ​​the cast pipe, resulting in a large measurement blind zone at both ends of the pipe.

[0005] On the other hand, the high-temperature oxide scale on the surface of the cast pipe will fall off during the inspection process, and the resulting iron powder and impurities can easily penetrate into the moving parts of the inspection equipment (such as pressure rollers), causing the equipment to jam, wear, and affect normal operation.

[0006] Meanwhile, the adaptability to pipe deformation is insufficient: cast pipes in production have problems such as straightness (bending) and out-of-roundness (especially deformation at the pipe tail). Existing probe devices lack effective adaptive mechanisms, making it difficult to ensure that the probe maintains a constant lifting distance from the pipe wall, resulting in unstable or even lost signals, and making continuous and reliable detection impossible.

[0007] Inaccurate gap control: The lift-off distance of the electromagnetic ultrasonic probe (i.e., the gap between the transmitter and the surface of the cast pipe) has a significant impact on signal strength. When the surface of the cast pipe is uneven, it is difficult to maintain a stable and optimal gap, thus affecting measurement accuracy.

[0008] Therefore, there is an urgent need for a casting pipe thickness measurement device and method that can adapt to complex and harsh working conditions such as high temperature, high dust, strong vibration and pipe deformation, and can achieve high precision, no (or very small) blind zone, and fully automatic continuous detection. Summary of the Invention

[0009] This invention provides a fully automatic electromagnetic ultrasonic thickness measuring device and its usage method, to solve the problem that existing technologies cannot achieve high-precision, blind-zone-free, continuous automatic thickness measurement under harsh working conditions such as high temperature (>200℃), high dust, and deformation of the pipe body.

[0010] According to one aspect of the present invention, a fully automatic electromagnetic ultrasonic thickness measuring device is provided for thickness detection of high-temperature cast pipes. The device is characterized by comprising a mounting frame and a probe mounted on the mounting frame. The mounting frame is equipped with pressure-bearing wheels. The probe includes a base and a permanent magnet core. The base has two parallel, spaced-apart stepped mounting holes. The permanent magnet core is fitted into the mounting holes via a core sleeve and sealed by an end cap. The side end of the base has spaced mounting chambers for mounting tungsten steel wheels, and the side end of the base has an elongated, waist-shaped hole through which a guide post passes. Both ends of the guide post are fixed to the mounting frame.

[0011] Preferably, based on the above scheme, the substrate is provided with an air blowing hole that communicates with the installation chamber.

[0012] Based on the above scheme, preferably, the permanent magnet probe core is stepped, and a probe core sleeve is installed at the bottom of the permanent magnet probe core. The probe also includes a coil connected by a signal line and a wear-resistant wedge. The wear-resistant wedge is installed at the bottom of the probe core sleeve, and the coil is located between the wear-resistant wedge and the permanent magnet probe core.

[0013] Based on the above scheme, a preferred embodiment is provided with an air passage groove on the outer circular surface of the probe sleeve.

[0014] Preferably, based on the above scheme, the mounting hole is stepped, and the end of the mounting hole is provided with a floating heat dissipation hole, which is connected to the air channel groove.

[0015] Preferably, based on the above scheme, the mounting frame includes a base, a guide rod, and a base frame. The base frame is slidably mounted on the guide rod, and the end of the guide rod is fixed on the base. The base frame includes a top plate and side plates. The side plates are spaced apart on the top plate, and the side plates are equipped with wheels. The two ends of the guide column are fixed on the side plates.

[0016] Based on the above-mentioned scheme, the preferred embodiment further includes a traveling frame and a lifting frame, wherein the lifting frame is mounted on the traveling frame and the mounting frame is mounted on the lifting frame.

[0017] Based on the above scheme, preferably, the walking frame includes a walking frame body and motor-driven frame rollers. The frame rollers are installed at the four corners of the walking frame body. The walking frame body is equipped with a motor-driven lifting rod, and the end of the lifting rod is fixedly connected to the lifting frame.

[0018] Based on the above scheme, preferably, the lifting frame includes an upper truss, a lower truss, and ball bearing guides. The upper truss and the lower truss are connected by four ball bearing guides. An electrical box is installed on the lower truss, and the end of the lifting rod is connected to the electrical box through a guide seat.

[0019] The present invention also provides a method for using a fully automatic electromagnetic ultrasonic thickness measuring device, comprising the following steps:

[0020] S1: The device is set up above or to the side of the cast pipe production line. Driven by the motor of the traveling frame, the device is moved to the starting detection position at the end of the cast pipe. Driven by the motor of the lifting frame, the height of the probe is adjusted so that the pressure-bearing traveling wheel and the tungsten steel traveling wheel of the probe come into contact with the surface of the cast pipe.

[0021] S2: Start the air source and introduce clean compressed air at a constant pressure into the air blowing port of the probe to form a stable cooling and protective air curtain below the probe.

[0022] S3: Start the electromagnetic ultrasonic detector and the walking frame drive motor, and move at a constant speed along the axis of the cast pipe. The probe rolls on the pipe wall through the adaptive wheel mechanism. The electromagnetic ultrasonic transducer unit emits ultrasonic waves to the pipe wall and receives the echo.

[0023] S4: The detector calculates and displays the wall thickness value in real time based on the ultrasonic flight time. At the same time, the encoder records the position information synchronously to achieve a precise correspondence between the wall thickness value and the axial position.

[0024] S5: When the cast pipe is bent or out of round, the probe, through the sliding fit between the waist-shaped elongated hole and the guide post and the slight rotation of the base, keeps the two tungsten steel wheels in contact with the pipe surface, automatically adjusts its posture, maintains a constant lift-off distance, and ensures signal stability.

[0025] S6: Full Coverage and End: The device moves to the other end of the cast pipe and completes the full-length scan; after the inspection is completed, the device automatically resets and prepares for the inspection of the next cast pipe.

[0026] Compared with the prior art, the fully automatic electromagnetic ultrasonic thickness measuring device of the present invention has the following significant advantages:

[0027] This invention uses a unique air curtain cooling system (air blowing hole - air channel - suspended heat dissipation hole channel) to continuously and forcibly cool the permanent magnet core and coil, and isolate the high-temperature radiant heat from the dust, so that the probe can work stably for a long time on the surface of the high-temperature cast pipe above 200°C.

[0028] On the other hand, the probe of the present invention has a compact structure and can be mounted in a floating manner to be close to the end of the tube. Combined with the precise movement control of the device, it can achieve detection with almost zero blind zone starting from the end of the tube.

[0029] Secondly, the air curtain can effectively blow away oxide scale dust and prevent it from entering moving parts; the tungsten steel wheels and bearing wheels have good wear resistance; the entire device has excellent sealing performance and is suitable for harsh environments with a lot of dust.

[0030] This invention employs a waist-shaped elongated hole-guide post floating structure and a dual-wheel design, making the probe an "intelligent following" system. This system automatically compensates for tube non-roundness, bending, and end deformation, maintaining an optimal and constant lift-off distance—key to achieving high-precision continuous detection. The constant lift-off distance ensures the stability of the electromagnetic ultrasonic signal intensity, fundamentally improving measurement accuracy and repeatability. Fully automated operation reduces human intervention, enhancing detection efficiency and reliability. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0032] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the fully automatic electromagnetic ultrasonic thickness measuring device of the present invention.

[0033] Figure 2 This is a three-dimensional schematic diagram of the assembly of the probe and the mounting bracket in this invention.

[0034] Figure 3 This is a cross-sectional view of the probe in this invention.

[0035] Figure 4 yes Figure 3 A three-dimensional view of the central base.

[0036] Figure 5 yes Figure 3 A cross-sectional view of the central base.

[0037] Figure 6 This is a perspective view of the core sleeve of the present invention;

[0038] Figure 7 This is a three-dimensional structural diagram of the mounting bracket of the present invention;

[0039] Figure 8 This is another cross-sectional view of the probe of the present invention.

[0040] Figure 9 This is a three-dimensional structural diagram of the probe and electrical box of the present invention.

[0041] Figure 10 This is a three-dimensional structural diagram of the linkage telescopic structure and probe installation of the present invention;

[0042] Figure 11 This is a three-dimensional structural diagram of the linkage telescopic structure of the present invention;

[0043] Explanation of icon numbers:

[0044] 1. Walking frame; 11. Walking frame body; 12. Frame body rollers; 13. Lifting rod; 14. Motor;

[0045] 2. Lifting frame; 21. Upper truss; 22. Lower truss; 23. Ball bearing guide rail; 24. Electrical box; 25. Guide seat;

[0046] 3. Mounting bracket; 31. Base; 32. Guide rod; 33. Base frame; 331. Top plate; 332. Side plate; 333. Bearing-bearing traveling wheel; 34. Top frame; 35. Connecting block; 36. Steering shaft; 37. Seat body;

[0047] 4. Probe; 41. Substrate; 411. Mounting hole; 412. Mounting chamber; 413. Waist-shaped elongated hole; 414. Air blowing hole; 415. Floating heat dissipation hole;

[0048] 42. Permanent magnet probe core; 43. Core sleeve; 431. Air passage groove; 432. Groove;

[0049] 44. End cap;

[0050] 45. Tungsten steel wheels;

[0051] 46. ​​Guide post;

[0052] 47. Wear-resistant wedges;

[0053] 48. Coil;

[0054] 241. Three-rod cylinder;

[0055] 26. Linkage telescopic structure;

[0056] 261. Rectangular connecting pipe (top);

[0057] 262. Rectangular connecting pipe (bottom);

[0058] 263. Connecting rods (general term); 2631. First connecting rod; 2632. Second connecting rod; 2633. Third connecting rod; 2634. Fourth connecting rod; 2635. Fifth connecting rod;

[0059] 2636. Sixth connecting rod; 264. Pin (used for hinged connection in the middle of the connecting rod);

[0060] 265. Adjusting shaft;

[0061] 266. Adjust the elongated hole;

[0062] 267. Pull plate. Detailed Implementation

[0063] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0064] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of a descriptive feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or sets.

[0065] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0066] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0067] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various components of the invention are relative rather than absolute. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, these directional indications also change accordingly.

[0068] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0069] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0070] Please see Figure 1 and combined Figure 2 and Figure 3 As shown, the present invention provides a fully automatic electromagnetic ultrasonic thickness measuring device for thickness detection of high-temperature cast pipes, comprising a walking frame 1, a lifting frame 2, a mounting frame 3, and a probe 4.

[0071] The mobile chassis of the traveling frame 1 of this invention comprises a rigid frame structure. Four corners of the traveling frame are equipped with frame rollers 12 driven by servo motors, allowing for precise positioning and movement on a pre-set track on the production line. A lifting drive mechanism is installed in the middle of the traveling frame 11; in this example, a lifting rod 13 driven by a motor 14 is used. Figure 1 As shown, in order to improve detection efficiency, the walking frame 11 of the present invention is provided with two lifting frames 2.

[0072] The lifting frame 2 of this invention is mounted on the traveling frame 1, and the upper truss 21 is fixedly connected to the traveling frame 1. Specifically, the lifting frame 2 of this invention includes an upper truss 21, a lower truss 22, and ball bearing guides 23. The lower truss 22 is connected to the upper truss 21 through four vertically arranged ball bearing guides 23 to ensure smooth lifting. The electrical box 24 is mounted on the lower truss 22 and integrates a motion controller, driver, etc. The end of the lifting rod 13 is fixedly connected to the top of the electrical box 24 through a guide seat 25. When encountering cast pipes of different diameters, the upward force exerted by the cast pipe on the lifting frame 2 will push the lifting rod 13 to move relative to the guide seat. Combined with the action of the ball bearing guides 23, this meets different needs. This reverse usage method of "ball bearing guides 23 moving, guide seat stationary" reduces the mass of moving parts and improves the stability and response speed of lifting motion.

[0073] The mounting frame 3 of the present invention is an intermediate floating mechanism connecting the lifting frame 2 and the probe 4. Specifically, the mounting frame 3 of the present invention includes a base 31, guide rods 32 and a base frame 33. The base 31 is installed at the bottom of the lower truss 22 of the lifting frame 2. The four guide rods 32 are divided into two groups and symmetrically installed at both ends of the base 31. The guide rods 32 pass through the base 31 and are slidably connected.

[0074] Specifically, the base 31 of the present invention includes a cross-shaped top frame 34, a top plate 331 and two side plates 332. The side plates 332 are spaced apart and connected to the top plate 331. The guide rods 32 are mounted on the top plate 331 by linear bearings and are limited at the bottom by nuts. The tops of the two sets of guide rods 32 are connected by the top frame 34.

[0075] The side plate 332 of the present invention is equipped with a high temperature resistant pressure-bearing walking wheel 333 on its outer side, which is used to support the surface of the cast pipe and roll.

[0076] Furthermore, in order to adapt to the changes in different cast pipe shapes, the present invention provides a connecting block 35 through the guide rod 32 and locks it with a nut. The connecting block 35 is provided with a connecting hole 351. A steering shaft 36 is installed in the connecting hole 351 through a bearing. The top frame 34 is equipped with a seat 37 at both ends, and the other end of the steering shaft 36 passes through the seat 37.

[0077] During operation, the magnetic attraction between the permanent magnet core 42 inside the probe 4 and the cast pipe ensures that the probe 4 remains in contact with the cast pipe at all times. When the shape of the cast pipe deforms at a certain angle, the action of the cast pipe on the pressure-bearing traveling wheel 333 will act on the guide rod 32, causing the top connecting block to rotate around the steering axis to adapt to the curvature change of the cast pipe. For details, please refer to [link to structural description]. Figure 8 As shown.

[0078] Please continue reading. Figure 3 As shown, the core component of the present invention, the probe 4, includes a base 41 and a permanent magnet probe core 42. The base 41 is provided with two parallel stepped mounting holes 411. The permanent magnet probe core 42 is installed in the mounting holes 411 through a core sleeve 43 and sealed by an end cap 44 to prevent dust from entering.

[0079] The base 41 has mounting chambers 412 for mounting tungsten steel wheels 45 at intervals on its side ends, and an oblong hole 413 is provided on the side end of the base 41. A guide post 46 passes through the oblong hole 413, and both ends of the guide post 46 are fixed to the side plate 332 of the mounting frame 3. This not only improves the stability of the mounting frame 3, but also realizes the connection between the base 41 and the mounting frame 3. For details of the structure, please refer to [link to structural description]. Figure 7 and Figure 5 As shown. Due to the design of the guide post 46 within the elongated hole 413, when the surface of the cast pipe is uneven or out of round, the probe 4 can closely follow the pipe surface up and down, avoiding signal loss due to momentary suspension.

[0080] The width of the base 41 is smaller than the width of the guide post 46. Therefore, the base 41 can move laterally relative to the guide post 46 in the horizontal plane. The base 41 can also move longitudinally in the horizontal plane through the movement of the guide post 46 in the waist-shaped elongated hole 413.

[0081] The substrate 41 of the present invention is provided with two parallel stepped mounting holes 411 arranged vertically at intervals. The permanent magnet probe 42 is installed in the mounting hole 411 through the core sleeve 43 and sealed with the end cap 44 to prevent dust from entering.

[0082] The core sleeve 43 of this invention has a wear-resistant wedge 47 made of zirconia ceramic installed at its bottom, and a coil 48 is embedded between the wear-resistant wedge 47 and the pole shoe of the permanent magnet probe 42. The coil 48 is connected to an external electromagnetic ultrasonic detector via a high-temperature cable. It is worth noting that resin is filled between the permanent magnet probe 42 and the core sleeve 43 for sealing.

[0083] The present invention also has an installation chamber 412 on each side of the bottom of the base 41, and a tungsten steel wheel 45 is installed inside the chamber through a high-temperature bearing. The tungsten steel wheel 45 is arranged along the width direction of the base 41.

[0084] An air blowing hole 414 is provided on the base 41 above the installation chamber 412. The air blowing hole 414 is connected to the installation chamber 412 and is connected to an external air source.

[0085] An air passage groove 431 is machined on the outer circumference of the core sleeve 43 (see...). Figure 6 and Figure 4 As shown, the air duct groove 431 can be spiral-shaped or multiple straight-lined grooves spaced apart on the outer edge of the core sleeve 43. A radially oriented floating heat dissipation hole 415 is formed at the step of the mounting hole 411, connecting the mounting chamber 412 and the air duct groove 431. To facilitate the installation of the coil 48, the present invention also provides a groove 432 on the upper end face of the core sleeve 43 to facilitate the introduction of the signal line of the coil 48.

[0086] During testing, the lifting frame 2 descends, bringing the pressure roller 333 and the tungsten carbide wheel 45 of the probe into contact with the surface of the cast pipe. Compressed air enters through the air blowing hole 414, part of which is blown directly onto the mounting chamber 412 and the wheel area to clean and cool the area; the other part enters the air channel groove 431 of the core sleeve 43 through the suspended heat dissipation hole 415, flows along the groove, and carries away a large amount of heat generated by the permanent magnet 42 and the coil 48. Finally, it overflows from the edge of the wear-resistant wedge 47, forming a dynamic air film between the probe and the high-temperature pipe wall. This significantly increases the upper temperature resistance of electromagnetic ultrasonic thickness measurement from 120℃ to 280℃, making it directly applicable to hot-cast pipe production lines.

[0087] As the device begins to move along the axial direction of the cast pipe, the probe rolls on the pipe wall via two tungsten carbide wheels 45. The electromagnetic ultrasonic testing instrument excites the coil 48 to generate ultrasonic waves, which propagate within the pipe wall and are reflected back from the bottom surface. The wall thickness is obtained by calculating the acoustic time.

[0088] When encountering such Figure 5 When the tube exhibits non-roundness (elliptical tube), the left tungsten carbide roller 45 slides down along the elongated hole 413 with the base 41 due to the concave tube surface. Simultaneously, the base 41 rotates slightly clockwise around the guide post 46, causing the right roller 45 to fit more tightly against the tube surface. This process is automatic and continuous, ensuring a constant average gap (distance) between the bottom surface of the wear-resistant wedge 47 and the tube wall, resulting in stable signal strength and thus guaranteeing measurement accuracy and continuity under complex tube shapes. The adaptive principle is similar for "flared" tube end deformation.

[0089] To further accelerate the descent and elevation of the bottom probe 4, the electrical box 24 of this invention adopts a rectangular frame structure, and a three-rod cylinder 241 is installed inside the electrical box 24. The three-rod cylinder 241 is fixed inside the electrical box 24, and its bottom is fixedly connected to the top frame 34. Figure 9 As shown.

[0090] Furthermore, to improve the stability of the probe 4 of the present invention, two parallel telescopic linkage structures 26 are also installed at the bottom of the electrical box 24. Each telescopic linkage structure 26 includes a rectangular connecting tube and connecting rods 263. The rectangular connecting tubes are respectively located at the top and bottom; that is, the top rectangular connecting tube (261) is connected to the electrical box 24. Multiple connecting rods 263 are arranged in a crisscrossing manner, and the middle portions of the connecting rods 263 are hinged together. Figure 10 and Figure 11 As shown, the connecting rod 263 includes a first connecting rod 2631, a second connecting rod 2632, a third connecting rod 2633, a fourth connecting rod 2634, a fifth connecting rod 2635, and a sixth connecting rod 2636. The first connecting rod 2631 and the second connecting rod 2632 are arranged crosswise and hinged in the middle by a pin 264. The end of the first connecting rod 2631 is hinged to the rectangular connecting tube 261. The end of the second connecting rod 2632 is inserted into the adjusting elongated hole 266 of the rectangular connecting tube 261 through an adjusting shaft 265. The third connecting rod 2633 and the fourth connecting rod 2634 are arranged crosswise and hinged in the middle by a pin 264. The end of the connecting rod 2633 is hinged to the first connecting rod 2631, and the end of the fourth connecting rod 2634 is hinged to the second connecting rod 2632; the fifth connecting rod 2635 and the sixth connecting rod 2636 are arranged crosswise and are hinged in the middle by a pin 264. The end of the fifth connecting rod 2635 is hinged to the end of the third connecting rod 2633, and the end of the sixth connecting rod 2636 is hinged to the fourth connecting rod 2634. The other end of the fifth connecting rod 2635 is hinged to another rectangular connecting tube 262, and the other end of the sixth connecting rod 2636 is inserted into the adjusting elongated hole 266 of the other rectangular connecting tube 262 through an adjusting shaft 265 for connection.

[0091] The base 31 of the mounting bracket 3 of the present invention is inserted at both ends between the connecting rods of two adjacent telescopic structures 26 to provide support force for the probe 4 in the direction of travel, so as to overcome the travel resistance and ensure that the probe 4 travels straight.

[0092] More preferably, the present invention also provides pull plates with rectangular connecting tubes arranged in parallel at both ends of the base, and a tension spring (not shown) is provided between the pull plate and the bottom of the electrical box.

[0093] More preferably, pull plates 267 parallel to the rectangular connecting tubes 261 and 262 are provided at both ends of the base 31, and a tension spring (not shown) is provided between the pull plates 267 and the bottom of the electrical box 24. The tension spring (not shown) provides an upward pulling force, which assists the three-bar cylinder 241 in overcoming the attraction between the strong magnet inside the probe 4 and the workpiece during normal operation; in the event of accidental air loss, it can ensure that the probe 4 always remains in the highest position, avoiding interference with the workpiece and causing equipment damage.

[0094] Under normal operating conditions, the three-bar cylinder 241 pushes the top frame 34 and probe 4 to achieve rapid lifting and lowering; the connecting rod telescopic structure 26 maintains stability during lifting and lowering, preventing the probe 4 from shifting laterally; the tension spring (not shown) provides auxiliary lifting force to reduce the load on the cylinder. In the event of air shortage or pressure loss, the tension spring (not shown) pulls the probe 4 to automatically lift it to a safe height to avoid collision. Through the above structures, this invention achieves rapid and stable lifting and movement of the probe 4, improving detection efficiency and equipment safety.

[0095] The present invention also provides a method for using a fully automatic electromagnetic ultrasonic thickness measuring device, comprising the following steps:

[0096] S1: The device is set up above or to the side of the cast pipe production line. Driven by the motor 14 of the walking frame 1, the device is moved to the starting detection position at the end of the cast pipe. Driven by the motor 14 of the lifting frame 2, the height of the probe 4 is adjusted so that the pressure-bearing walking wheel 333 and the tungsten steel walking wheel 45 of the probe 4 come into contact with the surface of the cast pipe.

[0097] S2: Start the air source and introduce clean compressed air at a constant pressure into the air blowing hole 414 of the probe 4 to form a stable cooling and protective air curtain below the probe 4.

[0098] S3: Start the electromagnetic ultrasonic detector and the driving motor 14 of the walking frame 1 to move at a constant speed along the axis of the cast pipe. The probe 4 rolls on the pipe wall through the adaptive wheel mechanism. The electromagnetic ultrasonic transducer unit emits ultrasonic waves to the pipe wall and receives the echo.

[0099] S4: The detector calculates and displays the wall thickness value in real time based on the ultrasonic flight time. At the same time, the encoder records the position information synchronously to achieve a precise correspondence between the wall thickness value and the axial position.

[0100] S5: When the cast pipe is bent or out of round, the probe 4, through the sliding fit between the waist-shaped elongated hole 413 and the guide post 46 and the slight rotation of the base 41, keeps the two tungsten steel wheels 45 in contact with the pipe surface, automatically adjusts its posture, maintains a constant lifting distance, and ensures signal stability.

[0101] S6: Full Coverage and End: The device moves to the other end of the cast pipe and completes the full-length scan; after the inspection is completed, the device automatically resets and prepares for the inspection of the next cast pipe.

[0102] After the operator sets the parameters on the host computer, the automatic detection program is started. The device runs fully automatically according to steps S1-S6: positioning, ventilation and cooling, start scanning, real-time data processing and display, adaptive adjustment, completion of scanning and generation of full-length wall thickness profile and quality report.

[0103] Finally, the method described in this application is merely a preferred embodiment and is not intended to limit the scope of protection of this invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A fully automatic electromagnetic ultrasonic thickness measuring device for thickness measurement of high-temperature cast pipes, characterized in that, The device includes a mounting frame and a probe mounted on the mounting frame. The mounting frame is equipped with pressure-bearing wheels. The probe includes a base and a permanent magnet core. The base has two parallel, spaced-apart stepped mounting holes. The permanent magnet core is fitted into the mounting holes and sealed with end caps. The side end of the base has spaced mounting chambers for mounting tungsten steel wheels, and the side end of the base has an elongated, waist-shaped hole through which a guide post passes. The two ends of the guide post are fixed to the mounting frame.

2. The fully automatic electromagnetic ultrasonic thickness measuring device as described in claim 1, characterized in that, The substrate is provided with an air blowing hole that communicates with the installation chamber.

3. The fully automatic electromagnetic ultrasonic thickness measuring device as described in claim 1, characterized in that, The permanent magnet probe core is stepped, and a probe core sleeve is installed at the bottom of the permanent magnet probe core. The probe also includes a coil connected by a signal line and a wear-resistant wedge. The wear-resistant wedge is installed at the bottom of the probe core sleeve, and the coil is located between the wear-resistant wedge and the permanent magnet probe core.

4. The fully automatic electromagnetic ultrasonic thickness measuring device as described in claim 3, characterized in that, The outer circumference of the probe sleeve is provided with an air passage groove.

5. The fully automatic electromagnetic ultrasonic thickness measuring device as described in claim 4, characterized in that, The mounting hole is stepped, and a floating heat dissipation hole is provided at the end of the mounting hole, which is connected to the air channel groove.

6. The fully automatic electromagnetic ultrasonic thickness measuring device as described in claim 1, characterized in that, The mounting frame includes a base, a guide rod, and a base frame. The base frame is slidably mounted on the guide rod, and the end of the guide rod is fixed to the base. The base frame includes a top plate and side plates. The side plates are spaced apart on the top plate, and the pressure-bearing traveling wheels are mounted on the side plates. The two ends of the guide column are fixed to the side plates.

7. The fully automatic electromagnetic ultrasonic thickness measuring device as described in claim 1, characterized in that, It also includes a traveling frame and a lifting frame, wherein the lifting frame is mounted on the traveling frame and the mounting frame is mounted on the lifting frame.

8. The fully automatic electromagnetic ultrasonic thickness measuring device as described in claim 7, characterized in that, The traveling frame includes a traveling frame body and motor-driven frame rollers. The frame rollers are installed at the four corners of the traveling frame body. The traveling frame body is equipped with a motor-driven lifting rod, and the end of the lifting rod is fixedly connected to the lifting frame.

9. The fully automatic electromagnetic ultrasonic thickness measuring device as described in claim 8, characterized in that, The lifting frame includes an upper truss, a lower truss, and ball bearing guides. The upper truss and the lower truss are connected by four ball bearing guides. An electrical box is mounted on the lower truss, and the end of the lifting rod is connected to the electrical box via a guide seat.

10. A method of using a fully automatic electromagnetic ultrasonic thickness measuring device, characterized in that, Includes the following steps: S1: The device is set up above or to the side of the cast pipe production line. Driven by the motor of the traveling frame, the device is moved to the starting detection position at the end of the cast pipe. Driven by the motor of the lifting frame, the height of the probe is adjusted so that the pressure-bearing traveling wheel and the tungsten steel traveling wheel of the probe come into contact with the surface of the cast pipe. S2: Start the air source and introduce clean compressed air at a constant pressure into the air blowing port of the probe to form a stable cooling and protective air curtain below the probe. S3: Start the electromagnetic ultrasonic detector and the walking frame drive motor, and move at a constant speed along the axis of the cast pipe. The probe rolls on the pipe wall through the adaptive wheel mechanism. The electromagnetic ultrasonic transducer unit emits ultrasonic waves to the pipe wall and receives the echo. S4: The detector calculates and displays the wall thickness value in real time based on the ultrasonic flight time. At the same time, the encoder records the position information synchronously to achieve a precise correspondence between the wall thickness value and the axial position. S5: When the cast pipe is bent or out of round, the probe, through the sliding fit between the waist-shaped elongated hole and the guide post and the slight rotation of the base, keeps the two tungsten steel wheels in contact with the pipe surface, automatically adjusts its posture, maintains a constant lift-off distance, and ensures signal stability. S6: Full Coverage and End: The device moves to the other end of the cast pipe and completes the full-length scan; after the inspection is completed, the device automatically resets and prepares for the inspection of the next cast pipe.

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