109 results about "Eddy-current testing" patented technology

The invention relates to the field of electromagnetic nondestructive testing, in particular to a curved surface self-adaptive eddy current testing probe, a nondestructive flaw detector and a testing method. The eddy current detection probe comprises a magnetic core bundle, an excitation coil and an induction coil. Wherein the magnetic core bundle is formed by densely arranging a plurality of ferromagnetic magnetic needles; and the excitation coil and the induction coil radially limit the magnetic core bundle. The excitation coil is wound on one end of the magnetic core bundle away from the detection surface and is used for connecting an adjustable power supply. The exciting coil generates an alternating magnetic field for detection in a target area by using the adjustable power supply, and magnetizes the magnetic core bundle by using the adjustable power supply, so that the detection surface of the eddy current detection probe is tightly adsorbed with the target area on the surface of a detected object. And the induction coil is wound at one end, close to the detection surface, in the magnetic core bundle and is used for inducing a signal generated by a detected object in the detection process. According to the invention, the problem that the existing electromagnetic nondestructive testing probe cannot be attached to various complex curved surfaces to cause signal attenuation and influence the measurement precision is solved.

The invention belongs to the technical field of eddy current detection. The eddy current automatic detection and calibration method comprises the steps that a pose deviation matrix is calculated, a mechanical arm carrying an eddy current probe is controlled to conduct pose adjustment according to the pose deviation matrix, and the current pose of the eddy current probe is obtained; under the current pose, an inductive impedance signal caused by eddy current change of the workpiece to be detected is obtained, and associated data of the current pose and the inductive impedance signal are obtained; and performing defect positioning on the workpiece entity to be detected according to the associated data, calculating the signal-to-noise ratio of the workpiece entity to be detected in combination with a defect positioning result, performing iterative optimization on the signal-to-noise ratio within a preset time, and determining the optimal detection pose of the eddy current probe when the signal-to-noise ratio is maximum. According to the method, personal errors caused by traditional manual calibration are eliminated, the multi-attitude detection requirement of the complex curved surface workpiece can be met, and the accuracy of defect quantitative analysis is remarkably improved.

The invention discloses a fusion device magnet coil copper conductor nondestructive testing method and a computer product, and relates to the technical field of nondestructive testing, the method comprises the following steps: obtaining original eddy current testing signals of a to-be-tested object or a plurality of areas of the to-be-tested object under specific physical conditions; preprocessing the original eddy current detection signal, wherein the preprocessing comprises denoising and signal correction; extracting features from the preprocessed signals and carrying out normalization processing; on the basis of a pre-established multi-parameter model related to the physical conditions of the to-be-tested object, theoretical signals of the to-be-tested object under various physical conditions are predicted through finite element simulation; and performing matching estimation on the normalized signal and a theoretical signal to obtain an estimated signal, and evaluating the defect existence probability based on the estimated signal. Based on an eddy current testing technology, a probe scans a sample and obtains a signal, and a finite element analysis method is combined to simulate and evaluate defects such as cracks possibly existing in a material.

The invention provides an array eddy current testing method and device for rivet hole edge cracks, and belongs to the technical field of nondestructive testing. An array eddy current detection method for rivet hole edge cracks comprises the following steps: S1, probe fitting: inserting a flexible eddy current array probe into a to-be-detected rivet hole, and controlling a miniature air pressure bag to inflate, so that the probe is adaptively fitted with a hole wall; s2, a signal acquisition step: applying a multi-frequency mixed excitation signal to the probe, moving the probe in a spiral progressive scanning mode, and acquiring an eddy current response signal of the hole wall; s3, signal compensation: according to the radial distance and azimuth angle of the current position of the probe; according to the device, the flexible eddy current array probe is matched with the air pressure attaching mechanism, so that the device can adapt to rivet holes with different hole diameters, the lift-off effect is eliminated, the signal consistency is improved, a hole edge false signal is effectively inhibited by establishing an accurate electromagnetic distortion function model and performing real-time compensation, and the false alarm rate is greatly reduced.

The invention is applicable to the field of metal material nondestructive testing, and provides a method for correcting wall thickness of a small block defect in pulsed eddy current testing, which comprises the following steps: starting a pulsed eddy current testing probe, and exciting a pulsed magnetic field by the probe to induce an eddy current field in a tested metal conductor; setting a detection step length, gradually scanning and detecting the defect direction of the detected metal conductor small block by a detection probe from a starting point, and automatically calculating and acquiring a wall thickness value at each detection point position; recording an initial change detection point and an end point change detection point of the wall thickness value obtained by scanning detection, calculating the distance DSE between the initial change detection point and the end point change detection point by combining the step length, and then calculating the defect size LDEF of a small block; and the minimum value h of the wall thickness values obtained through scanning detection is taken, and the actual wall thickness value h2 of the small block defect is calculated according to a correction formula. Through the correction method, the block defects smaller than the footprint size can be correctly evaluated, and serious consequences caused by wrong evaluation of small block serious defects are avoided.

The invention provides a deployable flexible GMR eddy current testing method and system for a complex curved surface component, and relates to the technical field of nondestructive testing. The method comprises the following steps: establishing a curved surface coordinate system and an expansion domain coordinate system, constructing a geometric mapping relation of a flexible sensing array, and performing clearance compensation, attitude correction and temperature drift correction on multi-frequency response data in an expansion domain to form a unified response data set; defect response distribution is generated through robust reconstruction and reprojected to the curved surface coordinate system, and space positioning and size and orientation recognition of defects are achieved; and adaptively updating the attitude, the path and the excitation scheme in combination with the fitting state parameters until the detection coverage and the confidence meet the requirements. According to the method, high-precision detection and process traceability of the defects of the complex curved surface component are realized.

The invention provides a weld joint dynamic eddy current detection method and system based on reinforcement learning, the system comprises a sensing layer, a decision layer, an execution layer and an identification layer, the sensing layer is used for collecting detection data of a weld joint surface, and the sensing layer comprises an eddy current sensor, a laser displacement meter and a thermal infrared imager; the decision-making layer is connected with the sensing layer and is used for dynamically adjusting detection parameters based on a reinforcement learning algorithm; the execution layer is connected with the decision layer, is used for executing a detection action according to the adjusted detection parameters, and comprises a four-axis linkage eddy current sensor and a frequency converter; the identification layer is connected with the sensing layer and the decision-making layer, is used for identifying weld defects based on the eddy current signals, and comprises a multi-defect identification model; and the decision layer dynamically adjusts detection parameters of the execution layer through a reinforcement learning algorithm by taking the time-frequency characteristic of the eddy current signal, the lift-off gap and the environment temperature as a state space and taking the frequency adjustment amount and the lift-off gap control instruction as an action space, so that real-time detection of the apparent defects of the welding seam is realized.

A kind of eddy current testing probe and method for identifying any crack and direction around hole, the probe includes a pie-shaped detection coil with middle magnetic core, the magnetic core not only ensures accurate positioning, but also uses magnetic collection effect by enhancing coil inductance, to strengthen the magnetic field inside and back of hole.The probe is also equipped with three layers of excitation coil, one layer and two layers of coil are arranged orthogonally, three layers and one layer of coil are at an angle of 135 °, realize the efficient detection of any direction crack and identify the direction of any crack defect.The flexible support of probe enables it to adapt to curved surface structure, widen the application range.The detection method uses orthogonal differential technology, uses the symmetry of hole structure to identify defects around hole, significantly improve the detection sensitivity of defects on the back and inside of hole structure.Compared with traditional surface and near-surface defect eddy current testing technology, the present application provides a more effective solution for high-precision detection of hole structure through innovative coil configuration and defect identification method.

The invention provides an L1 regularization eddy current defect imaging method based on closed-loop fractional order PID control, and relates to the field of electromagnetic eddy current detection.The method comprises the steps that defect imaging is carried out on collected eddy current data through an array eddy current sensor by means of the L1 regularization eddy current defect imaging method based on closed-loop fractional order PID control; defect position information of the metal material in a damaged state is theoretically obtained, and quantitative evaluation is carried out on defects. According to the imaging method disclosed by the invention, defect space distribution after multiple times of iterative optimization is highly matched with actually measured data, the defect characteristics of the metal component in a damaged state can be effectively positioned and evaluated, the non-contact detection characteristic eliminates the dependence on a mechanical scanning device, and the implementation is convenient.

The invention relates to the technical field of aero-engine nondestructive testing, and discloses an aero-engine support plate blade in-situ eddy current testing device and a testing method thereof, and the aero-engine support plate blade in-situ eddy current testing device comprises a handle, a telescopic probe rod and a testing end. The detection end is rotationally connected with the telescopic probe rod and comprises an adjusting swing block, a supporting end base, a clamping and positioning assembly and a transmission detection mechanism. The clamping and positioning assembly adopts a V-shaped fork block design, and can adapt to the shape and thickness of the blade for clamping, so that the detection end and the blade are kept stable. The transmission detection mechanism is composed of a miniature lead screw, a linear guide rail, an anti-backlash gear set and a servo motor and drives the detection probe assembly to accurately move along the surface of the blade. The detection probe adopts a leaf spring to support a flexible array eddy current sensor, and self-adaptive adjustment can be realized to ensure that the detection surface is tightly attached to the curved surface of the blade. The invention provides a device and a method capable of realizing rapid, full-area and high-sensitivity in-situ eddy current detection on a support plate blade under the condition that an engine is not disassembled and adaptive to air inlet space constraint.

The utility model relates to detection equipment for a chemical agent for metal, which comprises a seat body I, the upper end of the seat body I is connected with a three-axis moving platform, and the interior of the seat body I is fixedly connected with a drying box, a weight measuring part, an oil coating part and a cleaning test component; one side of the Z-axis moving end of the three-axis moving platform is fixedly connected with a swing test assembly, and the swing test assembly comprises a reciprocating swing unit; the reciprocating swing unit comprises a first motor, a third rotary disc, a rod body, a swing rod, a third movable groove and an electric clamping jaw. The cleaning test assembly comprises a shell II, a cavity, a cover body, an opening and an eddy current test assisting unit; the eddy current testing assisting unit comprises a second motor, a second rotating disc rotationally connected to the inner wall of the cavity, a first rotating disc rotationally connected to the lower end of the cover body, and a column body connected between the first rotating disc and the second rotating disc. Compared with the prior art, the dynamic condition of a workpiece in actual use can be simulated, different working conditions can be simulated, the test result has higher application value, cleaning process parameters are accurately verified and optimized, and universality is achieved.

An eddy current testing apparatus and associated method for performing nondestructive testing of heat exchanger tubes accessible through the tubesheet. The apparatus includes a motor-driven drive pulley and one or more idler pulleys that engage a test cable of a test probe, feeding the test cable and test head into and retrieving the test cable and test head from within the heat exchanger tube under test. The apparatus' support bracket includes a manually expandable tube clamp operated by an actuation lever. The clamp includes a tubular locking sleeve with an expandable portion that inserts into and releasably locks onto an anchor tube in the tubesheet, thereby cantilevering the apparatus from the tubesheet. The idler pulley is attached to a motor-driven pivot arm, which is movable between an inward position that presses the test cable against the drive pulley and an outward position that releases the cable for easy setup or removal.

The invention belongs to the technical field of eddy current detection. According to the eddy current detection device and method for the annular piece, a multi-channel profiling eddy current sensor can horizontally move and rotate along the center axis of the annular piece, the detection width is smaller than the width of a groove, and the multi-channel profiling eddy current sensor is provided with a first alternating magnetic field generation assembly and a second alternating magnetic field generation assembly; the flexible array eddy-current sensor and the single-channel profiling eddy-current sensor are respectively provided with a third alternating magnetic field generating assembly matched with the outer surface of the annular piece with smaller curvature change and a fourth alternating magnetic field generating assembly matched with the outer surface of the annular piece with larger curvature change; the four alternating magnetic field generation assemblies are all of a differential eddy current coil circuit connection structure. The problems that the omission ratio is high due to the fact that a common rigid probe and a fixed path are difficult to match with the complex curved surface of the annular part, the false alarm rate is increased due to paint layer noise and electromagnetic interference of the annular part, and the manual detection efficiency is low can be solved, the detection efficiency is improved, and omission and false detection are avoided.

To provide a coil module, a probe for detecting an eddy current, and an eddy current detector which can be manufactured at low cost in a short time.SOLUTION: The coil module includes: a cross coil having a first coil forming an annular shape surrounding a first axial line, and a second coil forming an annular shape surrounding a second axial line intersecting the first axial line and covering a part of an outer peripheral side of the first coil; and a coil holder having a storage recessed part for holding a plurality of cross coils formed in a state where a plurality of cross coils are arrayed in an arraying direction extending in a direction intersecting with the first axial line and the second axial line in a surface formed by the first axial line and the second axial line. In a pair of cross coils adjacent to each other in the arraying direction, the first coil of the cross coil on one side faces the second coil of the cross coil on the other side, and the second coil of the cross coil on one side faces the first coil of the cross coil on the other side.SELECTED DRAWING: Figure 3

The present application relates to the field of hollow shaft detection, and relates to a high-speed rail hollow shaft inner hole array eddy current detection system, which does not need to adopt a shaft hole end adapter and a take-up motor, does not need manual adjustment centering, can realize fast alignment detection and fast take-up, and comprises a moving trolley, a controller, a display and a detection device, the detection device comprises a shell and take-up, push detection, guiding structure, the take-up structure adopts a three-section slide rail type guide groove with variable diameter, the detection probe in the push detection structure is conical and can be replaced by pulling and inserting, the detection line adopts nylon tube packaging, the guiding structure is arranged at the probe outlet end of the shell and is used for guiding the probe into the inner hole of the hollow shaft, the guiding structure can be expanded to adapt to hollow shafts with different structures and sizes, and a laser centering assembly is additionally arranged to realize automatic centering of the detection probe and the inner hole. The present application optimizes the structure and performance of the existing array eddy current detection device, saves production manufacturing cost, and has a simpler overall structure and is easier to operate, and the detection result is accurate and reliable.

The utility model provides an eddy current testing device for a variable-diameter shaft, which comprises a probe movement control mechanism, a probe clamping mechanism, a probe library, a sample block library and a workpiece rotating table, and the probe library, the sample block library and the workpiece rotating table are arranged corresponding to the movement track of the probe movement control mechanism; the probe library is provided with a plurality of probe fixing rings for storing eddy current probes, the sample block library comprises a mounting vertical plate and a plurality of profiling test blocks assembled on the mounting vertical plate, and the workpiece rotating table comprises a first rotating table and a workpiece clamp mounted on the first rotating table; and the probe movement control mechanism is connected with the probe clamping mechanism so as to drive the probe clamping mechanism to be switched among the probe library, the sample block library and the workpiece rotating table. And the mechanical detection of the variable-diameter shaft can be realized.

The present application relates to the technical field of nondestructive testing, and provides a kind of dynamic characteristic eddy current detection system and method of scraper chain to solve the problems of low detection efficiency, unable to measure tension and speed synchronously, and probe is easily damaged in harsh environment and inconvenient to maintain, etc.The technical scheme of the system mainly includes: probe detection unit, adopts built-in iron core array coil layout, synchronously induces dynamic eddy current determined by chain speed and induced eddy current caused by tension change;Detection protection unit is provided with upper and lower open and close maintenance opening for quick maintenance;And detection lift-off regulation unit can accurately adjust the distance between probe and chain.The present application can realize the online synchronization, high-precision monitoring of scraper chain tension and speed, significantly improve the detection efficiency and reliability, and at the same time enhance the environmental adaptability and maintenance convenience of the system, and provide effective support for intelligent operation and maintenance of scraper conveyor.

The invention provides a pulsed eddy current detection device and detection method based on roller pair adjustment, and relates to the technical field of nondestructive detection. The device comprises a supporting frame, a roller pair, a telescopic driving mechanism, a detection probe, a sliding adjusting mechanism, a distance measuring unit and a control unit. The control unit maintains the constant distance between the detection probe and the surface of the detected rod body based on a feedback signal of the distance measuring unit; based on the distance and the roller state signal, a telescopic driving mechanism is controlled to adjust the posture of the roller pair, so that the axis of the roller pair is aligned with the axis of the measured rod body; and when a preset spacing stability condition and an alignment condition are met, controlling the detection probe to transmit a pulsed eddy current excitation signal to the detected rod body, and receiving and outputting an eddy current response signal for defect identification. The double-shaft lift-off effect is actively inhibited through dynamic closed-loop control, the stability and accuracy of a detection signal are guaranteed, and then the recognition rate and detection reliability of the rod body surface and near-surface defects are remarkably improved.

This application provides a compressed air supply mechanism, belonging to the field of eddy current testing technology, which can improve the pressure stability of the supplied compressed air, as well as the stability and accuracy of eddy current test results, and improve testing efficiency. The compressed air supply mechanism includes a supply pipeline, a compressor, a series-connected air storage unit, a multi-stage gradient filtration unit, and a multi-stage drying unit. The series-connected air storage unit is used to store the compressed air supplied by the compressor, precipitate impurities in the compressed air, and stabilize the pressure of the compressed air. The multi-stage gradient filtration unit includes multiple filtration modules and is used to further remove impurities and moisture from the compressed air. The multi-stage drying unit includes multiple drying modules and is used to remove moisture from the compressed air. The filtration modules, drying modules, and series-connected air storage unit are arranged alternately to enhance the filtration effect. This application also provides an eddy current testing system.

Method for eddy current testing of cast components (100) in a production line, wherein the cast components (100) are tested individually, comprising the steps: - Arranging the cast component (100) to be tested in a holder (300) which has at least two eddy current sensors (310); - Measuring local electrical conductivities of the cast component (100), for which each eddy current sensor (310) performs at least one measurement; - Evaluating the measurements, for which the measured values ​​of each eddy current sensor (310) are compared with a specific target value range (S), whereby the correct position of the cast component (100) arranged in the holder (300) is first detected using the eddy current sensors (310) and the measurements are then started automatically; - Evaluate the cast component (100) as defective if at least one measured value is outside the specific target value range (S), otherwise evaluate the cast component (100) as free of defects.

The utility model discloses a special pneumatic claw for automatic positioning equipment for a heat transfer tube of a heat exchanger, which relates to the technical field of nondestructive testing of heat exchangers in the electric power industry and comprises a moving substrate, and a cushion block is mounted above the moving substrate; a lower piston structure of the piston pull rod is mounted in the central cylinder body, and forms an air cylinder structure with the lower end cover and the upper end cover, and the expansion head acts in the pipe hole; the utility model relates to a fixing device required by tube plate crawling positioning equipment applied to eddy current testing equipment, the device is called as a pneumatic claw, and the pneumatic claw can enable the tube plate crawling positioning equipment to tightly grasp a tube hole and freely crawl or position on a tube plate. The pneumatic claw can realize the expansion action, the contraction action, the action of inserting the expansion head into the pipe hole and the action of pulling the expansion head out of the pipe hole in the pipe hole, can be applied to grasping and positioning of various heat transfer pipe holes, and provides technical support for realizing automatic detection of eddy current detection of more heat transfer pipes of heat exchangers.

The invention belongs to the technical field of eddy current detection. The rail vehicle communication cable broken wire array eddy current detection probe comprises a plane winding displacement coil and a differential three-dimensional coil array, the plane winding displacement coil is used for applying high-frequency excitation, and the differential three-dimensional coil array is used for sensing broken wire defect magnetic field disturbance; the differential three-dimensional coil array comprises a plurality of differential three-dimensional coil pairs, each differential three-dimensional coil pair comprises a first three-dimensional coil and a second three-dimensional coil, the first three-dimensional coil is arranged at the position where the magnetic field disturbance gradient of the planar winding displacement coil is maximum, and the second three-dimensional coil is arranged at the position where the magnetic field disturbance gradient of the planar winding displacement coil is minimum. The detection bottleneck of a thick insulating layer is broken through, the channel consistency of the array probe is optimized, the detection efficiency and precision of the communication cable under the large lift-off working condition are greatly improved, interference is effectively restrained, the structural adaptability is high, and effective recognition of the broken wire in the cable can be achieved.

The application provides an array probe for eddy current testing. The array probe comprises a centering frame and flat coils arranged in the centering frame; the flat coils comprise excitation coils and receiving coils; the excitation coils are used for sending eddy current for testing; and the receiving coils are used for receiving feedback signals for testing. The application has the advantages that the application solves the problems of poor universality, high cost and low work efficiency of the existing eddy current probe scanning device; the internal multiplexing system of the application greatly reduces the adverse effects of mutual inductance, and programs the actual time when each coil is excited to send its eddy current signal. In the detection process, the phase and frequency of the signal can determine the defect depth of the target object, and the amplitude of the signal can determine the loss amount of the defect metal in the coil induction area; moreover, the closer to the excitation coil, the higher the sensitivity, and the detection has directionality, so that accurate detection is realized.

The invention relates to the field of eddy current detection, and provides a steel pipe eddy current detection device which comprises an eddy current detection piece, a steel pipe center recognition assembly and a moving assembly. The eddy current detection member has a probe hole. The steel pipe center identification assembly comprises a horizontal identification unit and a vertical identification unit; the horizontal identification unit comprises a horizontal driving part and a horizontal identification sensor; the horizontal driving piece is connected with the horizontal identification sensor; the horizontal identification sensor can identify two opposite side edges of the steel pipe to be detected in the horizontal width direction; the vertical identification unit comprises a vertical driving piece and a vertical identification sensor; the vertical driving piece is connected with the vertical identification sensor; the vertical identification sensor can identify two opposite side edges of the steel pipe to be detected in the vertical width direction; the moving assembly is connected with the eddy current detection piece and used for driving the eddy current detection piece to move so that the central axis of the probe hole can pass through the horizontal center and the vertical center of the to-be-detected steel pipe. The eddy current detection device solves the problem that a traditional eddy current detection device is low in detection accuracy.

This invention provides a pulsed eddy current testing device and method for pipelines with insulation layers, belonging to the field of non-destructive testing technology for pipelines. It can at least partially solve the problems of existing pulsed eddy current testing methods, such as lift-off fluctuations and electromagnetic shielding interference caused by the outer metal protective layer, low testing reliability, and the need to remove the insulation layer. This invention includes: a flexible sensing strip and a control module. The flexible sensing strip is composed of multiple sensing strip segments assembled by a connecting mechanism and fitted onto the outside of the pipeline to be tested. From the inside out, it includes a lift-off compensation layer, an electromagnetic sensing layer, and a magnetic shielding layer. The lift-off compensation layer includes an airbag unit to adaptively conform to the surface of the outer protective layer to eliminate lift-off fluctuations. The electromagnetic sensing layer includes an excitation unit and a differential receiving unit to cancel common-mode interference from the outer protective layer at the hardware level. The magnetic shielding layer includes a magnetic unit array to concentrate the magnetic field and enhance penetration. This invention achieves in-service testing without removing the insulation layer through three-layer synergy.

The application discloses a micro-precision eddy current detection method and a detection device thereof, which is used for eddy current nondestructive detection of micro holes (11) with different shapes on an aero turbine engine rotor blade (1). The detection device (2) is connected to a multi-channel eddy current detection instrument, and comprises an eddy current detection instrument (3), a probe shell (21) and a flexible PCB (22). The flexible PCB is fixed to the end of the probe shell (21) close to a detection surface, and an eddy current detection sensor (221) is arranged on the flexible PCB (22). The flexible PCB (22) is characterized in that an elastic shielding film (23) is arranged on the side close to the detected object, and a supporting device (24) is arranged on the side away from the detected object. The application sets an elastic shielding film with micro holes on the detection surface of the flexible PCB eddy current detection sensor, elastically supports and opens the micro holes on the elastic shielding film, thereby forming a micro aperture detection window area on the detection surface of the flexible PCB eddy current detection sensor, and realizing the precise eddy current nondestructive detection of a micro area.

This invention proposes a processing technology for hollow stabilizer bars in automobiles. The core of this technology lies in first achieving the final mechanical properties of the tubing through heat treatment, followed by forming and subsequent processing. The process involves online induction heat treatment of the hollow straight tube: sequential induction heating austenitization, quenching (martensitic transformation), and medium-frequency induction tempering (troostitic or sorbitic transformation), followed by water cooling to room temperature and eddy current testing. Then, the hollow straight tube, having achieved its final properties, undergoes end processing (flattening, drilling, welding), followed by cold bending into a three-dimensional shape using a CNC tube bending machine, and immediately undergoes stress-relief annealing to eliminate residual processing stress. Next, cold straightening is used to calibrate the position of key mounting points, followed by shot peening to improve fatigue life. Finally, coating (cleaning, phosphating, electrostatic spraying, baking) forms a protective layer. This process, by prior heat treatment followed by forming, effectively improves the product's heating uniformity, microstructure, and controls residual stress.

The utility model discloses a steel rail welding seam eddy current detection probe, which comprises a plurality of eddy current detection coils, a probe wire, a U-shaped elastic framework and a handle, the U-shaped elastic framework comprises a groove bottom, a first side wall and a second side wall, and the included angle between the first side wall and the second side wall is adjustable. A first group of eddy current detection coils is mounted on the surface, facing the second side wall, of the first side wall and is used for being attached to the upper inclined surface of the rail bottom, and a second group of eddy current detection coils is mounted on the surface, facing the first side wall, of the second side wall and is used for being attached to the lower surface of the rail bottom; a third group of eddy current detection coils is mounted at the bottom of the groove and is used for being attached to the side edge of the rail bottom; the handle is installed on the side, opposite to the opening end of the U-shaped elastic framework, of the groove bottom of the U-shaped elastic framework. According to the eddy current detection probe for the steel rail welding seam, the probe is attached to the welding seam at the bottom of the steel rail, so that the accuracy of a welding seam detection result and the detection efficiency are improved.

The utility model provides a heat insulation mechanism of an eddy current testing probe, which belongs to the technical field of nondestructive testing, and comprises a heat conduction piece which is annularly wrapped on the outer surface of the end part of the probe, is made of a flexible material, is simultaneously connected with a cooling assembly, and is connected with the cooling assembly to realize heat exchange so as to achieve the purpose of cooling the outer wall of a detector; the heat insulation part annularly wraps the outer surface of the heat conduction part, and a body of the heat insulation part is made of a flexible material and used for isolating external temperature from being transmitted to the heat conduction part; the cooling assembly is used for physically cooling the heat conduction piece in a heat exchange mode; according to the utility model, the eddy current detection probe is effectively cooled, so that the detection obstacle in a high-temperature environment is overcome, and the detection efficiency and reliability are improved.

The utility model discloses an eddy current flaw detection sample rod carving depth detection tool, and relates to the technical field of measurement. An eddy current flaw detection sample rod carving depth detection tool comprises a detection bottom plate, the top of the detection bottom plate is fixedly connected with a detection mounting frame and a sample rod clamping structure, the sample rod clamping structure is located on the detection bottom plate, and the sample rod clamping structure comprises a first bidirectional threaded rod, a driving motor, two clamping frames, two rotating cylinders and two fixing plates. A first sliding groove is formed in the top of the detection bottom plate, a first two-way threaded rod is rotationally connected into the first sliding groove, through cooperation of a clamping frame, rotating cylinders, a clamping plate, an electric push rod, a gear ring and a gear, a sample rod can be installed in the two rotating cylinders, and the clamping plate can fix the sample rod; furthermore, the gear can conveniently drive the sample rod to rotate through the gear ring, so that an eddy current flaw detector can conveniently detect the surface of the sample rod, and the convenience of sample rod detection is further improved.