Detection device for turbine blade pin

Abstract

The invention provides a detection device for a steam turbine blade pin, belongs to the technical field of detection, and is used for solving the problem that the steam turbine blade pin is difficult to detect. The detection device for the steam turbine blade pin comprises a transmitting part, a receiving part and a display part. The emission part comprises an excitation module and a conversion module. The excitation module can enable the pin to generate an alternating magnetic field so as to excite an ultrasonic guided wave signal. And the conversion module can enable the ultrasonic guided wave signal to be subjected to modal conversion and transmit the pin. The receiving part comprises a receiving module and a transmission module. The receiving module is used for receiving the ultrasonic guided wave signal transmitted by the pin internal defect and converting the ultrasonic guided wave signal into an electric signal. The receiving module is connected to the transmission module. The display part is connected to the transmission module. And the display part can receive and process the electric signal transmitted by the transmission module so as to display the detection result. The device can accurately and reliably position and quantify the defects of the turbine blade pin.

Description

Technical Field

[0001] The invention belongs to the field of detection technology, and in particular relates to a detection device for turbine blade pins. Background Art

[0002] The main function of a steam turbine is to convert the linear motion of high-temperature and high-pressure steam into rotational motion to drive the generator rotor to generate electricity. The turbine blades are subjected to complex forces during operation. Most blades are fixed with pins. When the turbine rotates, the pins are subjected to complex stresses, which are prone to fatigue cracks, seriously affecting their service life and reliability. Therefore, it is necessary to regularly inspect the pins on the turbine blades. However, since the removal and reinstallation of the turbine blade pins are cumbersome and costly, and the removal of the pins will also affect the dynamic balance of the turbine rotor, the pins are generally not disassembled when inspecting them. The pins that are not disassembled only expose the end faces on both sides, and the rest of the parts are embedded in the turbine blades, making the inspection difficult. At present, the conventional inspection methods for pins are mainly the straight probe longitudinal wave method and the small angle longitudinal wave method. The main disadvantages and problems of the straight probe longitudinal wave method are: 1) If the coupling agent between the wafer surface of the straight probe and the surface of the pin to be inspected is improperly used or the pin surface is uneven, the ultrasonic flaw detection results will be inaccurate. 2) When using a straight probe for detection, the method used is the reflection method. The reflection characteristics of different defects will lead to inaccurate characterization of the defects, thus affecting the positioning. 3) For pins of certain special shapes or structures, such as the side walls of cylindrical pins, there may be blind areas, which makes it difficult for the straight probe to accurately locate the defects. 4) Since the sound beam usually has a certain width, when using a straight probe for detection, it is difficult to accurately determine the plane position of the defect even at the position where the defect wave amplitude is the largest. The main disadvantages and problems of the small-angle longitudinal wave method: 1) When the geometry of the pin to be tested is complex or the probe movement range is constrained, it is difficult to achieve accurate positioning. 2) In long pins, due to the long propagation path of the sound wave in the material, the sound wave attenuation is large, which affects the detection effect of the small-angle longitudinal wave method. 3) The roughness of the pin surface) Oil or other contaminants may affect the coupling and propagation of ultrasonic waves, thereby affecting the detection accuracy of the small-angle longitudinal wave method. 4) For very small defects, the small-angle longitudinal wave method may have difficulty in providing sufficient resolution to accurately locate and quantify these defects. 5) If the probe is not selected properly or the flaw detector is not set correctly, the test results will be affected. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide a detection device for turbine blade pins, which can accurately and reliably locate and quantify the defects of the turbine blade pins.

[0004] In order to solve the above problems, the present invention provides a detection device for turbine blade pins. The detection device for turbine blade pins includes: a transmitting part, a receiving part and a display part. The transmitting part includes an excitation module and a conversion module. The excitation module can generate an alternating magnetic field in the pin, thereby exciting an ultrasonic guided wave signal. The conversion module can cause the ultrasonic guided wave signal to undergo modal conversion and transmit through the pin. The receiving part includes a receiving module and a transmission module. The receiving module is used to receive the ultrasonic guided wave signal transmitted through the internal defects of the pin, and convert the ultrasonic guided wave signal into an electrical signal. The receiving module is connected to the transmission module. The display part is connected to the transmission module. The display part can receive and process the electrical signal transmitted by the transmission module to display the detection result.

[0005] Optionally, the excitation module includes: a first power supply and a first electromagnetic coil. The first power supply is connected to the first electromagnetic coil. The first electromagnetic coil is close to the end of the pin. The first power supply provides a current pulse into the first electromagnetic coil to generate an alternating magnetic field in the pin.

[0006] Optionally, the conversion module includes: a second power supply, a second electromagnetic coil and a first electromagnetic core. The second power supply is connected to the second electromagnetic coil. The second electromagnetic coil is wound around the first electromagnetic core. The second power supply provides a current pulse into the second electromagnetic coil, so that a pulsed electromagnetic field is formed around the first electromagnetic core, thereby causing the ultrasonic guided wave signal in the pin to undergo a modal conversion.

[0007] Optionally, the first power source and the second power source are both lithium-ion power batteries.

[0008] Optionally, the transmitting unit further comprises a first shell. The first shell is made of a permanent magnet material. The excitation module and the conversion module are located in the first shell.

[0009] Optionally, the conversion module is capable of converting the ultrasonic guided wave signal into torsional waves and longitudinal waves.

[0010] Optionally, the receiving module includes: an electromagnetic component, a detection coil and a signal receiver. The electromagnetic component is used to provide a pulsed electromagnetic field. The detection coil is located on a side of the electromagnetic component facing the pin. The signal receiver is connected to the detection coil.

[0011] Optionally, the electromagnetic assembly includes: a third power supply, a third electromagnetic coil and a second electromagnetic core. The third power supply is connected to the third electromagnetic coil. The third electromagnetic coil is wound around the second electromagnetic core. The second electromagnetic core is located on a side of the detection coil away from the pin. The third power supply provides a current pulse into the third electromagnetic coil, so that a pulsed electromagnetic field is formed around the second electromagnetic core.

[0012] Optionally, the receiving part further comprises a second shell. The second shell is made of a permanent magnet material. The receiving module and the transmission module are located in the second shell.

[0013] Optionally, the display unit is capable of displaying at least one of a waveform graph, a C-scan image, and a DAC curve.

[0014] Beneficial Effects

[0015] The detection device for turbine blade pins provided by the present invention comprises a transmitting part, a receiving part and a display part. The transmitting part comprises an excitation module and a conversion module. The excitation module can generate an alternating magnetic field in the pin, and due to the magnetostrictive effect, the pin is subjected to alternating stress, and stress and compression deformation are generated inside the pin. That is, an induced current is generated inside the pin, thereby exciting an ultrasonic guided wave signal. The conversion module can cause the ultrasonic guided wave signal generated in the inspected pin to undergo modal conversion, and after passing through the internal defects of the pin, it transmits through the pin and enters the receiving part. The receiving part comprises a receiving module and a transmission module. When the ultrasonic guided wave signal enters the receiving part, due to the inverse magnetostrictive effect, the magnetic flux in the receiving module can be changed, and the magnetic flux change is converted into an induced electromotive force, that is, an electrical signal. By measuring the induced electromotive force, the time and amplitude of the transmitted ultrasonic guided wave signal can be indirectly measured, thereby obtaining information such as the position and size of the defect. The transmission module can transmit the information obtained by the receiving module to the display part, and the information processed by the display part can be displayed through an image, thereby effectively helping the inspection personnel to analyze and judge the integrity of the material and the nature, size and spatial position of the defect. The detection device for turbine blade pins of the present invention adopts electromagnetic coupling with the pin end surface, and does not need to use coupling agent or move the probe, thereby avoiding contamination and wear of the detection surface. The ultrasonic guided wave signal is transmitted and received in a one-time manner, thereby avoiding the attenuation and scattering of the signal by the reflection method, and can quickly, accurately and reliably detect the position and size of the internal defects of the pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a detection device for turbine blade pins according to an embodiment of the present invention.

[0017] The reference numerals are as follows:

[0018] 1. Transmitter; 2. Pin; 3. Receiver;

[0019] 11. Excitation module; 12. Conversion module; 13. First shell;

[0020] 111. a first power source; 112. a first electromagnetic coil;

[0021] 121. second power source; 122. second electromagnetic coil; 123. first electromagnetic core;

[0022] 21. Defects;

[0023] 31. Receiving module; 32. Transmitting module; 33. Second housing;

[0024] 311, electromagnetic component; 312, detection coil; 313, signal receiver;

[0025] 3111. The third power supply; 3112. The third electromagnetic coil; 3113. The second electromagnetic core. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0030] This embodiment provides a detection device for turbine blade pins. Figure 1 A schematic structural diagram of a detection device for turbine blade pins provided in this embodiment.

[0031] like Figure 1As shown, the detection device for turbine blade pins of this embodiment includes a transmitting unit 1, a receiving unit 3 and a display unit. The transmitting unit 1 includes an excitation module 11 and a conversion module 12. The excitation module 11 can generate an alternating magnetic field in the pin 2, thereby exciting an ultrasonic guided wave signal. The conversion module 12 can cause the ultrasonic guided wave signal to undergo modal conversion and transmit the pin 2. The receiving unit 3 includes a receiving module 31 and a transmission module 32. The receiving module 31 is used to receive the ultrasonic guided wave signal transmitted through the internal defect 21 of the pin 2, and convert the ultrasonic guided wave signal into an electrical signal. The receiving module 31 is connected to the transmission module 32. The display unit is connected to the transmission module 32. The display unit can receive and process the electrical signal transmitted by the transmission module 32 to display the detection result.

[0032] The transmission module 32 of this embodiment adopts a WiFi transmission device. Based on the complex on-site inspection environment, the wireless data transmission mode can effectively solve the inconvenience caused by cable connection.

[0033] The detection device for turbine blade pins of this embodiment includes a transmitter 1, a receiver 3 and a display unit. The transmitter 1 includes an excitation module 11 and a conversion module 12. The excitation module 11 can generate an alternating magnetic field in the pin 2. Due to the magnetostrictive effect, the pin 2 is subjected to alternating stress, and stress and compression deformation are generated inside. That is, an induced current is generated inside the pin 2, thereby exciting an ultrasonic guided wave signal. The conversion module 12 can cause the ultrasonic guided wave signal generated in the inspected pin 2 to undergo modal conversion, and after passing through the internal defect 21 of the pin 2, it penetrates the pin 2 and enters the receiving unit 3. The receiving unit 3 includes a receiving module 31 and a transmission module 32. The ultrasonic guided wave signal after penetrating the pin 2 enters the receiving unit 3. Due to the inverse magnetostrictive effect, it can cause the magnetic flux in the receiving module 31 to change, and the magnetic flux change is converted into an induced electromotive force, that is, an electrical signal. By measuring the induced electromotive force, the time and amplitude of the transmitted ultrasonic guided wave signal can be indirectly measured, thereby obtaining information such as the position and size of the defect 21. The transmission module 32 can transmit the information obtained by the receiving module 31 to the display unit, and the information processed by the display unit can be displayed through images, thereby effectively helping the inspection personnel to analyze and judge the integrity of the material and the nature, size and spatial position of the defects.

[0034] The detection device for turbine blade pins of this embodiment uses electromagnetic coupling with the end surface of the pin 2, without the need to use coupling agent or move the probe, thus avoiding contamination and wear of the detection surface. The ultrasonic guided wave signal is transmitted and received in a one-time manner, thus avoiding the attenuation and scattering of the signal by the reflection method, and can quickly, accurately and reliably detect the position and size of the internal defect 21 of the pin 2.

[0035] In some embodiments, Figure 1As shown, the excitation module 11 includes: a first power supply 111 and a first electromagnetic coil 112. The first power supply 111 is connected to the first electromagnetic coil 112. The first electromagnetic coil 112 is close to the end of the pin 2. The first power supply 111 provides a current pulse into the first electromagnetic coil 112, so that an alternating magnetic field is generated in the pin 2.

[0036] The first power source 111 of this embodiment can provide a pulse current to the first electromagnetic coil 112, so that a pulse electromagnetic field is formed around the first electromagnetic coil 112. Since the pin 2 is made of ferromagnetic material, an induced current can be formed on one side of the pin 2 close to the first electromagnetic coil 112, and the material inside the pin 2 is subjected to the Lorentz force caused by the pulse electromagnetic field and the alternating stress due to the magnetostrictive effect, resulting in stress and compression deformation inside the material, thereby exciting an ultrasonic guided wave signal.

[0037] It should be noted that, in this embodiment, the pulse current size provided by the first power supply 11 and the number of turns and distribution form of the first electromagnetic coil 112 can be set according to the actual specifications of the detection pin 2, and this embodiment does not impose too many restrictions on this.

[0038] In some embodiments, Figure 1 As shown, the conversion module 12 includes: a second power supply 121, a second electromagnetic coil 122 and a first electromagnetic core 123. The second power supply 121 is connected to the second electromagnetic coil 122. The second electromagnetic coil 122 is wound around the first electromagnetic core 123. The second power supply 121 provides a current pulse into the second electromagnetic coil 122, so that a pulsed electromagnetic field is formed around the first electromagnetic core 123, thereby causing the ultrasonic guided wave signal in the pin 2 to undergo a modal conversion.

[0039] The second power supply 121 of this embodiment can provide a pulse current to the second electromagnetic coil 122. Since the second electromagnetic coil 122 is wound around the first electromagnetic core 123, a pulse electromagnetic field pointing to the pin 2 can be formed. The pulse electromagnetic field can cause the ultrasonic guided wave signal in the pin 2 to undergo modal conversion and can also improve the conversion efficiency of magnetic energy and acoustic energy.

[0040] It should be noted that, in this embodiment, the pulse current size provided by the second power supply 121, the number of turns of the second electromagnetic coil 122, and the size specifications of the first electromagnetic core 123 can be set according to the specifications of the actual pin 2 to be detected, and this embodiment does not impose too many restrictions on this.

[0041] In some embodiments, Figure 1 As shown, the first power source 111 and the second power source 121 are both lithium-ion power batteries.

[0042] The first power source 111 and the second power source 121 of this embodiment adopt lithium-ion power batteries, which have the advantages of high energy, high battery voltage, wide operating temperature range, long storage life, light weight and no pollution, which is conducive to reducing the weight of the detection device, extending the service life of the detection device, saving energy and being environmentally friendly, and easy to use.

[0043] It is understandable that in other embodiments, the first power source 111 and the second power source 121 may also use other types of batteries, or may not have batteries and be designed to be directly connected to an external power source. This embodiment does not impose too many restrictions on this as long as it can meet the use requirements.

[0044] In some embodiments, Figure 1 As shown, the transmitting unit 1 further includes a first housing 13. The first housing 13 is made of a permanent magnet material. The excitation module 11 and the conversion module 12 are located in the first housing 13.

[0045] like Figure 1 As shown, the first housing 13 of the present embodiment is designed to be U-shaped, surrounding the excitation module 11 and the conversion module 12 , and the opening direction faces the pin 2 .

[0046] The transmitting part 1 of this embodiment also includes a first shell 13, which is made of permanent magnet material and can provide a stable external magnetic field for the transmitting part 11 and the inspected pin 2, so as to facilitate the excitation of ultrasonic waves on the inspected object (not limited to the pin 2, but can be any workpiece with conductivity or ferromagnetism, or both), thereby achieving the purpose of non-destructive testing.

[0047] It is understandable that the first housing 13 may also be a DC electromagnet.

[0048] In some embodiments, Figure 1 As shown, the conversion module 12 is capable of converting the ultrasonic guided wave signal into a torsional wave and a longitudinal wave.

[0049] Ultrasonic guided waves are an ultrasonic wave mode propagating in a structured medium, which can generate wave signals of various modes such as transverse waves, longitudinal waves, surface waves, etc. In this embodiment, the twisted waves and longitudinal waves can propagate along a specific path of the inspected pin 2 and can maintain their energy and characteristics over a long distance. In this way, the sensitivity and resolution can be effectively guaranteed, and the sound waves will not diffuse, and the energy distribution is uniform.

[0050] In addition, the propagation characteristics of ultrasonic guided waves are closely related to the geometric shape and material properties of the structure, so the inspection plan can be designed for a specific structure. According to the characteristics of the component, a dedicated device can be designed to make the inspection results more reliable.

[0051] In some embodiments, Figure 1As shown, the receiving module 31 includes: an electromagnetic component 311, a detection coil 312 and a signal receiver 313. The electromagnetic component 311 is used to provide a pulsed electromagnetic field. The detection coil 312 is located on the side of the electromagnetic component 311 facing the pin 2. The signal receiver 312 is connected to the detection coil 312.

[0052] The receiving module 31 of this embodiment includes an electromagnetic component 311, a detection coil 312 and a signal receiver 313. The electromagnetic component 311 provides a magnetic field for the detection coil 312. The detection coil 312 receives the ultrasonic guided wave transmitted through the internal defect 21 of the pin 2. Due to the inverse magnetostrictive effect, the magnetic flux passing through the detection coil 312 changes. The detection coil 312 converts the magnetic flux change into an induced electromotive force, that is, an electrical signal. The signal receiver 313 can indirectly obtain the time and amplitude of the transmitted ultrasonic guided wave signal by receiving the induced electromotive force of the detection coil 312. The time and amplitude of the transmitted ultrasonic guided wave signal can be used to obtain information such as the position and size of the defect 21.

[0053] In some embodiments, Figure 1 As shown, the electromagnetic assembly 311 includes: a third power supply 3111, a third electromagnetic coil 3112 and a second electromagnetic core 3113. The third power supply 3111 is connected to the third electromagnetic coil 3112. The third electromagnetic coil 3112 is wound around the second electromagnetic core 3113. The second electromagnetic core 3113 is located on the side of the detection coil 3112 away from the pin 2. The third power supply 3111 provides a current pulse into the third electromagnetic coil 3112, so that a pulsed electromagnetic field is formed around the second electromagnetic core 3113.

[0054] The electromagnetic component 311 of this embodiment includes a third power supply 3111, a third electromagnetic coil 3112 and a second electromagnetic core 3113. The third power supply 3111 can provide a pulse current to the third electromagnetic coil 3112. Since the third electromagnetic coil 3112 is wound around the second electromagnetic core 3113, a pulse electromagnetic field pointing to the pin 2 can be formed.

[0055] It should be noted that the third power source 3111 of this embodiment is a lithium-ion power battery.

[0056] In some embodiments, Figure 1 As shown, the receiving part 3 further includes a second housing 33. The second housing 33 is made of a permanent magnet material. The receiving module 31 and the transmission module 32 are located in the second housing 33.

[0057] like Figure 1 As shown, the second housing 33 of the present embodiment is designed to be U-shaped, surrounding the receiving module 31 and the transmission module 32 , and the opening direction faces the pin 2 .

[0058] The receiving part 3 of this embodiment also includes a second shell 33, which is made of permanent magnet material and can provide a stable external magnetic field to facilitate the reception of ultrasonic guided waves transmitted by the object to be tested (not limited to the pin 2, but can be any workpiece with conductivity or ferromagnetism, or both), thereby achieving the purpose of non-destructive testing.

[0059] It is understandable that the second housing 33 may also be a DC electromagnet.

[0060] In some embodiments, Figure 1 As shown, the display unit can display at least one of a waveform graph, a C-scan image, and a DAC curve.

[0061] The display unit of this embodiment uses a display device that can receive wireless signals. The specific process is: receiving and processing the signal transmitted by the transmission module 32 to display the waveform, C-scan image and DAC curve, which effectively helps the inspection personnel analyze and judge the integrity of the material and the nature, size and spatial location of the defects.

[0062] Among them, C-scan image is a technology that uses the principle of ultrasonic flaw detection to extract echo information perpendicular to the specified section of the sound beam (i.e., the transverse section image) to form a two-dimensional image. Its principle is simple, it can obtain information on different sections, and it is widely used. The DAC curve is the distance amplitude curve.

[0063] The above is an introduction to the detection device for turbine blade pins of this embodiment. This device is mainly used to detect turbine blade pins in thermal power plants, but can also be used to detect other workpieces. This device is based on the principle of ultrasonic transmission detection, and adopts electromagnetic coupling with the pin end face, detects ultrasonic guided waves in a one-to-one form, and transmits the detection data wirelessly. The defects of turbine blade pins can be accurately and reliably located and quantified. At the same time, electromagnetic coupling does not cause wear and pollution to the detected surface, and the wireless transmission of data also eliminates the inconvenience caused by cable connection.

[0064] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A detection device for turbine blade pins, characterized in that: include: Transmitting part, receiving part and display part; The transmitting part includes an excitation module and a conversion module; the excitation module can generate an alternating magnetic field in the pin, thereby exciting an ultrasonic guided wave signal; the conversion module can cause the ultrasonic guided wave signal to undergo modal conversion and transmit the pin; The receiving part includes a receiving module and a transmission module; the receiving module is used to receive the ultrasonic guided wave signal transmitted through the internal defect of the pin and convert the ultrasonic guided wave signal into an electrical signal; the receiving module is connected to the transmission module; The display unit is connected to the transmission module; the display unit can receive and process the electrical signal transmitted by the transmission module to display the detection result.

2. The detection device for turbine blade pins according to claim 1, characterized in that: The excitation module includes: a first power supply and a first electromagnetic coil; The first power source is connected to the first electromagnetic coil; the first electromagnetic coil is close to the end of the pin; the first power source provides current pulses into the first electromagnetic coil to generate an alternating magnetic field in the pin.

3. The detection device for turbine blade pins according to claim 2, characterized in that: The conversion module includes: a second power supply, a second electromagnetic coil and a first electromagnetic core; The second power supply is connected to the second electromagnetic coil; the second electromagnetic coil is wound around the first electromagnetic core; the second power supply provides current pulses into the second electromagnetic coil, so that a pulsed electromagnetic field is formed around the first electromagnetic core, thereby causing the ultrasonic guided wave signal in the pin to undergo modal conversion.

4. The detection device for turbine blade pins according to claim 3, characterized in that: The first power source and the second power source are both lithium-ion power batteries.

5. The detection device for turbine blade pins according to any one of claims 1 to 3, characterized in that: The transmitting unit also includes a first shell; the first shell is made of permanent magnet material; the excitation module and the conversion module are located in the first shell.

6. The detection device for turbine blade pins according to claim 1, characterized in that: The conversion module is capable of converting the ultrasonic guided wave signal into a torsional wave and a longitudinal wave.

7. The detection device for turbine blade pins according to claim 1, characterized in that: The receiving module includes: an electromagnetic component, a detection coil and a signal receiver; The electromagnetic component is used to provide a pulsed electromagnetic field; the detection coil is located on a side of the electromagnetic component facing the pin; and the signal receiver is connected to the detection coil.

8. The detection device for turbine blade pins according to claim 7, characterized in that: The electromagnetic assembly comprises: a third power supply, a third electromagnetic coil and a second electromagnetic core; The third power supply is connected to the third electromagnetic coil; the third electromagnetic coil is wound around the second electromagnetic core; the second electromagnetic core is located on the side of the detection coil away from the pin; the third power supply provides current pulses into the third electromagnetic coil, so that a pulsed electromagnetic field is formed around the second electromagnetic core.

9. The detection device for turbine blade pins according to claim 1, characterized in that: The receiving part also includes a second shell; the second shell is made of permanent magnet material; the receiving module and the transmission module are located in the second shell.

10. The detection device for turbine blade pins according to claim 1, characterized in that: The display unit can display at least one of a waveform graph, a C-scan image, and a DAC curve.

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