Crack detection probe, detection device and reactor inner surface crack detection method

Abstract

The invention provides a crack detection probe, a detection device and a method for detecting cracks on the inner surface of a reactor. Wherein the crack detection probe comprises two receiving units and an excitation unit, and each receiving unit comprises a receiving coil, a U-shaped magnetic core and a plurality of annular magnetic cores; the U-shaped magnetic core comprises a body and an opening part formed by bending the body; the plurality of annular magnetic cores are arranged on the magnetic core body in a sleeving manner, and each annular magnetic core is fixedly connected with the magnetic core body; the receiving coil is wound on the magnetic core body and the annular magnetic core; the excitation unit comprises an excitation coil and an annular piece, and the excitation coil is wound on the annular piece; the annular piece is clamped to the opening part; the first end face and the second end face, opposite to each other, of the annular piece abut against the two inner side faces of the opening part respectively. The U-shaped magnetic core is sleeved with the multiple annular magnetic cores, so that the radiation range can be enlarged, the voltage amplitude of induced voltage signals generated by the crack detection probe is effectively increased, and the recognition capacity and detection sensitivity of the crack detection probe to crack defects are improved.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic eddy current nondestructive testing, and in particular to a crack detection probe, a detection device, and a method for detecting cracks on the inner surface of a reactor. Background Technology

[0002] Ultra-high pressure tubular reactors are one of the core and critical pieces of equipment in modern polyethylene production plants in the petrochemical industry. During the manufacturing stage, ultra-high pressure tubular reactors undergo self-reinforcing treatment to improve the distribution of residual stress in the reactor's inner walls, thereby enhancing their elastic load-bearing capacity. Because ultra-high pressure tubular reactors operate under high temperature, high pressure, and high medium flow rate conditions for extended periods, the self-reinforcing residual stress will decay after a certain operating period. Under conditions exceeding the design service life, a significant decay of the self-reinforcing residual stress may lead to cracks and defects in the reactor's inner walls, potentially causing leaks, explosions, and other accidents, resulting in substantial economic losses and even casualties.

[0003] Eddy current testing is an important method for non-destructive testing of ultra-high pressure tubular reactors. However, current eddy current testing probes have limited detection ranges, insufficient to fully cover the entire area under inspection. This narrow range may cause cracks located outside the probe's detection range to be missed, affecting the testing results. Furthermore, traditional probes have high sensitivity for detecting open-type cracks on the reactor's inner surface, but poor sensitivity for near-surface or subsurface cracks. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a crack detection probe, a detection device, and a method for detecting cracks on the inner surface of a reactor. By placing multiple annular magnetic cores on a U-shaped magnetic core, the radiation range can be increased, effectively increasing the voltage amplitude of the induced voltage signal generated by the crack detection probe, and improving the crack detection probe's ability to identify crack defects and its detection sensitivity.

[0005] In a first aspect, embodiments of the present invention provide a crack detection probe, comprising:

[0006] Two receiving units are provided, each receiving unit comprising: a receiving coil, a U-shaped magnetic core, and multiple ring-shaped magnetic cores; the U-shaped magnetic core includes a core body and an opening formed by bending the core body; the multiple ring-shaped magnetic cores are sleeved on the core body, and each ring-shaped magnetic core is fixedly connected to the core body; the receiving coil is wound around the core body and the ring-shaped magnetic cores.

[0007] An excitation unit includes an excitation coil and an annular component, wherein the excitation coil is wound around the annular component; the annular component is engaged with the opening; and the opposite first and second end faces of the annular component abut against the two inner sides of the opening, respectively.

[0008] In some embodiments of the present invention, the projection shape of the annular magnetic core in the horizontal direction perpendicular to the paper and pointing inward is fan-shaped.

[0009] In some embodiments of the present invention, the opening distance of the opening is equal to the width between the first end face and the second end face of the annular member.

[0010] In some embodiments of the present invention, the spacing between two adjacent annular magnetic cores is equal.

[0011] Secondly, embodiments of the present invention provide a detection device, including a crack detection probe as described in the first aspect of the embodiments above.

[0012] In some embodiments of the present invention, the detection device further includes:

[0013] The pulsed eddy current instrument includes an excitation port and a receiving port. The excitation port is connected to the excitation unit of the crack detection probe, and the receiving port is connected to the receiving unit of the crack detection probe.

[0014] In some embodiments of the present invention, the pulsed eddy current instrument includes:

[0015] The pulsed eddy current generating unit includes the excitation port; the pulsed eddy current generating unit is used for: the pulsed eddy current instrument to generate a periodic square wave pulse current signal, and outputting the square wave pulse current signal to the excitation unit of the crack detection probe placed in the tubular reactor to be tested through the excitation port, so that the excitation coil of the excitation unit is alternately energized and de-energized, forming a changing intracavitary magnetic field in the tubular reactor to be tested;

[0016] A voltage signal receiving unit includes the receiving port; the voltage signal receiving unit is used to: receive, through the receiving port, the induced voltage signal generated by the receiving coil of the crack detection probe under the changing intracavitary magnetic field;

[0017] A data processing unit is connected to the output terminal of the voltage signal receiving unit; the voltage signal receiving unit is used to: perform data analysis and processing on the induced voltage signal to obtain a profile of the induced voltage curve.

[0018] Thirdly, embodiments of the present invention provide a method for detecting cracks on the inner surface of a reactor, including a detection device as described in the second aspect of the embodiments above, the detection device including: a pulsed eddy current instrument and a crack detection probe;

[0019] The pulsed eddy current instrument generates a periodic square wave pulse current signal. Through the excitation port, the square wave pulse current signal is output to the excitation unit of the crack detection probe placed in the tubular reactor to be tested, so that the excitation coil of the excitation unit is alternately energized and de-energized, forming a changing intracavitary magnetic field in the tubular reactor to be tested.

[0020] The pulsed eddy current instrument receives the induced voltage signal generated by the receiving coil of the crack detection probe under the changing intracavitary magnetic field through the receiving port.

[0021] The pulsed eddy current instrument performs data analysis and processing on the induced voltage signal to obtain a profile of the induced voltage curve.

[0022] In some embodiments of the present invention, the pulsed eddy current instrument receives the attenuated voltage signal generated by the receiving coil of the crack detection probe under the changing intracavity magnetic field, and further includes:

[0023] The crack detection probe receives the induced voltage signal generated at the test point on the inner surface of the tubular reactor; wherein the induced voltage signal includes voltage decay time and induced voltage amplitude.

[0024] Based on the voltage decay time and the induced voltage amplitude, induced voltage curve profiles are generated under different time window conditions; wherein, the induced voltage curve profiles are used to display the induced voltage change trend curves under different time windows, and the depressions in the induced voltage change trend curves indicate the location of defects with cracks on the inner surface of the tested tubular reactor.

[0025] In some embodiments of the present invention, the pulsed eddy current instrument further includes: a display unit, the display unit being electrically connected to the data processing unit;

[0026] After generating the induced voltage curve profiles under different time window states, the method further includes:

[0027] Different colors are used to identify the induced voltage change trend curves under different time window states, resulting in a colored induced voltage curve profile.

[0028] The display unit displays the colored profile of the induced voltage curve.

[0029] The crack detection probe according to embodiments of the present invention has at least the following beneficial effects:

[0030] The crack detection probe includes two receiving units and an excitation unit. Each receiving unit includes a receiving coil, a U-shaped magnetic core, and multiple ring-shaped magnetic cores. The U-shaped magnetic core includes a core body and an opening formed by bending the core body. Multiple ring-shaped magnetic cores are sleeved on the core body, and each ring-shaped magnetic core is fixedly connected to the core body. The receiving coil is wound around the core body and the ring-shaped magnetic cores. The excitation unit includes an excitation coil and a ring-shaped component. The excitation coil is wound around the ring-shaped component. The ring-shaped component is engaged with the opening. The opposing first and second end faces of the ring-shaped component abut against the two inner sides of the opening, respectively. According to the technical solution of the present invention, by sleeved multiple ring-shaped magnetic cores on a U-shaped magnetic core, the radiation range can be increased, effectively increasing the voltage amplitude of the induced voltage signal generated by the crack detection probe, and improving the crack detection probe's ability to identify crack defects and its detection sensitivity. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a crack detection probe provided in one embodiment of the present invention;

[0032] Figure 2 This is a front view of a crack detection probe provided in one embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of a detection device provided in one embodiment of the present invention;

[0034] Figure 4 This is a schematic flowchart of a method for detecting cracks on the inner surface of a reactor provided in one embodiment of the present invention;

[0035] Figure 5 This is a schematic flowchart of generating a profile of an induced voltage curve provided in one embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the induced voltage profile curve provided in one embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of a longitudinal crack defect in the induced voltage profile provided in one embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of a transverse crack defect in the induced voltage profile provided in one embodiment of the present invention;

[0039] Figure label:

[0040] Crack detection probe 100, pulsed eddy current instrument 101, tubular reactor 102, receiving unit 110, toroidal magnetic core 111, U-shaped magnetic core 112, excitation unit 120, and toroidal component 121. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0043] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0044] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0045] This invention provides a crack detection probe, a detection device, and a method for detecting cracks on the inner surface of a reactor. The crack detection probe includes two receiving units and an excitation unit. Each receiving unit includes a receiving coil, a U-shaped magnetic core, and multiple ring-shaped magnetic cores. The U-shaped magnetic core includes a core body and an opening formed by bending the core body. Multiple ring-shaped magnetic cores are fitted onto the core body, and each ring-shaped magnetic core is fixedly connected to the core body. The receiving coil is wound around the core body and the ring-shaped magnetic cores. The excitation unit includes an excitation coil and a ring-shaped component. The excitation coil is wound around the ring-shaped component. The ring-shaped component is engaged with the opening. The opposing first and second end faces of the ring-shaped component abut against the two inner surfaces of the opening, respectively. According to the technical solution of this invention, by fitting multiple ring-shaped magnetic cores onto a U-shaped magnetic core, the radiation range can be increased, effectively increasing the voltage amplitude of the induced voltage signal generated by the crack detection probe, and improving the crack detection probe's ability to identify crack defects and its detection sensitivity.

[0046] The following description, based on the accompanying drawings, further illustrates a crack detection probe according to an embodiment of the present invention.

[0047] Reference Figure 1A schematic diagram of the structure of a crack detection probe provided in one embodiment of the present invention is shown. The crack detection probe 100 includes two receiving units and an excitation unit, wherein:

[0048] Two receiving units 110 are provided. Each receiving unit 110 includes: a receiving coil, a U-shaped magnetic core 112, and a plurality of ring magnetic cores 111. The U-shaped magnetic core 112 includes a magnetic core body and an opening formed by bending the magnetic core body. The plurality of ring magnetic cores 111 are sleeved on the magnetic core body, and each ring magnetic core 111 is fixedly connected to the magnetic core body. The receiving coil is wound around the magnetic core body and the ring magnetic cores 111.

[0049] The excitation unit 120 includes an excitation coil and an annular member 121. The excitation coil is wound on the annular member 121. The annular member 121 is engaged with the opening. The opposite first end face and second end face of the annular member 121 abut against the two inner sides of the opening, respectively.

[0050] It should be noted that, referring to Figure 1 The number of receiving units 110 is set to two, which can expand the radiation range of the crack detection probe 100 during the detection process. Specifically, the number of receiving units 110 can also be set to more than two, in order to adapt to the detection of cracks on the inner surface of the tubular reactor 102 in different occasions.

[0051] It should be noted that, referring to Figure 1 In the receiving unit 110, multiple annular magnetic cores 111 are sleeved on the magnetic core body, and each annular magnetic core 111 is fixedly connected to the magnetic core body; the receiving coil is wound on the magnetic core body and the annular magnetic core 111, and the direction of the receiving coil wound on the U-shaped magnetic core 112 body and the annular magnetic core 111 is consistent, which can receive a single induced voltage signal of the reaction of the internal crack on the inner surface of the receiving tubular reactor 102.

[0052] It should be noted that, referring to Figure 2 The excitation unit 120 includes an excitation coil and an annular member 121, with the excitation coil wound around the annular member 121. The annular member 121 is engaged with an opening. The opposing first and second end faces of the annular member 121 abut against the two inner sides of the opening, respectively. Specifically, the opening distance of the opening is equal to the width between the first and second end faces of the annular member 121. This arrangement allows the annular member 121 to be tightly connected to the U-shaped magnetic core 112, enabling the receiving coil to more effectively capture the magnetic field changes generated by the excitation coil. This close arrangement reduces magnetic field loss during transmission, allowing the receiving coil to receive a stronger signal.

[0053] It should be noted that, referring to Figure 2The projection shape of the toroidal core 111 in the horizontal direction perpendicular to the paper and pointing inwards is fan-shaped. The purpose of this arrangement is to allow the toroidal core 111 to radiate outwards over a wider range.

[0054] It should be noted that, referring to Figure 2 The spacing between two adjacent annular magnetic cores 111 is equal. Specifically, the spacing between two adjacent annular magnetic cores 111 is 5mm to 8mm, which can uniformly receive the secondary magnetic field energy generated by the eddy current in the tubular reactor and generate an induced voltage signal.

[0055] It should be noted that in the receiving unit 110, the receiving coil is wound around the magnetic core body and the toroidal magnetic core 111, and the wire diameter of the receiving coil is set to 0.1mm to 0.12mm. The smaller the wire diameter, the greater the resistance. The purpose of selecting a wire diameter of 0.1mm to 0.12mm is to ensure detection sensitivity and at the same time avoid the heat generation caused by excessive resistance of the receiving coil. The copper enameled wire with 200 to 750 turns can improve the signal acquisition capability of the receiving coil.

[0056] It should be noted that in the excitation unit 120, the excitation coil is wound on the annular part 121. The excitation coil can be set with a wire diameter of 0.2mm to 0.5mm. Setting a larger wire diameter can enhance the strength of the electromagnetic field. The coil has 150 to 350 turns of copper enameled wire.

[0057] According to the first aspect of the embodiment of this application, the crack detection probe includes: two receiving units, each receiving unit including: a receiving coil, a U-shaped magnetic core, and multiple ring magnetic cores; the U-shaped magnetic core includes a core body and an opening formed by bending the core body; multiple ring magnetic cores are sleeved on the core body, and each ring magnetic core is fixedly connected to the core body; the receiving coil is wound around the core body and the ring magnetic cores; the excitation unit includes an excitation coil and a ring element, the excitation coil being wound around the ring element; the ring element is snapped into the opening; the opposite first end face and second end face of the ring element respectively abut against the two inner sides of the opening. By sleeved multiple ring magnetic cores on a U-shaped magnetic core, the radiation range can be increased, effectively increasing the voltage amplitude of the induced voltage signal generated by the crack detection probe, and improving the crack detection probe's ability to identify crack defects and its detection sensitivity.

[0058] Reference Figure 3 A schematic diagram of the detection device provided in one embodiment of the present invention includes a crack detection probe 100 as described above, and further includes:

[0059] The pulsed eddy current instrument 101 includes an excitation port and a receiving port. The excitation port is connected to the excitation unit 120 of the crack detection probe 100, and the receiving port is connected to the receiving unit of the crack detection probe 100.

[0060] It should be noted that the pulsed eddy current instrument 101 includes:

[0061] The pulsed eddy current generating unit includes an excitation port. The pulsed eddy current generating unit is used to generate periodic square wave pulse current signals by the pulsed eddy current instrument 101. Through the excitation port, the square wave pulse current signals are output to the excitation unit 120 of the crack detection probe 100 placed in the tubular reactor 102 to be tested, so that the excitation coil of the excitation unit 120 is alternately energized and de-energized, forming a changing intracavitary magnetic field in the tubular reactor 102 to be tested.

[0062] A voltage signal receiving unit includes a receiving port; the voltage signal receiving unit is used to receive, through the receiving port, the induced voltage signal generated by the receiving coil of the crack detection probe 100 under a changing intracavity magnetic field.

[0063] The data processing unit is connected to the output of the voltage signal receiving unit; the voltage signal receiving unit is used to perform data analysis and processing on the induced voltage signal to obtain a profile of the induced voltage curve.

[0064] It should be noted that the data processing unit can perform detailed analysis on the single induced voltage signal received by the voltage signal receiving unit to obtain induced voltage curve profiles reflecting the detection results of longitudinal crack defects and induced voltage curve profiles reflecting the detection results of transverse crack defects.

[0065] According to the second aspect of the present application, the detection device includes a pulsed eddy current instrument and a crack detection probe. The pulsed eddy current instrument can integrate the generation of periodic square wave pulse current signals, the reception of induced voltage signals, and the data analysis and processing of the induced voltage signals. When used in conjunction with the crack detection probe, the entire detection device makes crack detection in tubular reactors more convenient.

[0066] Reference Figure 4 A flowchart of a method for detecting cracks on the inner surface of a reactor according to an embodiment of the present invention is provided. This method includes, but is not limited to, the following steps:

[0067] Step S11: The pulsed eddy current instrument generates a periodic square wave pulse current signal. Through the excitation port, the square wave pulse current signal is output to the excitation unit of the crack detection probe placed in the tubular reactor to be tested, so that the excitation coil of the excitation unit is alternately energized and de-energized, forming a changing intracavitary magnetic field in the tubular reactor to be tested.

[0068] In step S12, the pulsed eddy current instrument receives the induced voltage signal generated by the receiving coil of the crack detection probe under the changing intracavity magnetic field through the receiving port.

[0069] Step S13: The pulsed eddy current instrument performs data analysis and processing on the induced voltage signal to obtain a profile of the induced voltage curve.

[0070] It should be noted that, in step S11, the change in the magnetic field inside the tubular reactor 102 is specifically manifested as follows: the pulsed eddy current instrument 101 generates a square wave pulse current signal, and the excitation coil generates a primary magnetic field around the inner wall of the tubular reactor 102; after the current is turned off, the changing primary magnetic field will induce eddy currents on the inner wall of the tubular reactor 102, and the change in the eddy currents on the inner wall of the tubular reactor 102 will induce a decaying secondary magnetic field. The receiving coil picks up the change in eddy currents and converts it into an induced voltage signal.

[0071] It should be noted that in step S12, the pulsed eddy current instrument 101 receives only a single induced voltage signal generated by the receiving unit of the receiving crack detection probe 100 in the changing intracavity magnetic field through the receiving port.

[0072] It should be noted that in step S13, the pulsed eddy current instrument 101 performs data analysis and processing on the induced voltage signal, and generates an induced voltage curve profile to reflect longitudinal crack defects and transverse crack defects by performing data analysis and processing on the single induced voltage signal.

[0073] According to the reactor internal surface crack detection method provided in the third aspect of this application, through steps S11 to S13, a pulsed eddy current instrument generates a periodic square wave pulse current signal. This signal is output to the excitation unit of the crack detection probe placed inside the tubular reactor under test via the excitation port. This causes the excitation coil of the excitation unit to be alternately energized and de-energized, forming a changing intracavitary magnetic field within the tubular reactor. The pulsed eddy current instrument receives the induced voltage signal generated by the receiving coil of the crack detection probe under the changing intracavitary magnetic field via the receiving port. The instrument performs data analysis and processing on the induced voltage signal to obtain an induced voltage curve profile. This method can achieve full-circumference crack detection within the tubular reactor in a single operation, avoiding the omission of cracks outside the probe's detection range and affecting the detection effect. It can also detect deep crack defects on the inner surface of the tubular reactor.

[0074] In one embodiment, reference is made to Figure 5 This also includes, but is not limited to, the following steps:

[0075] S21, receive the induced voltage signal generated by the crack detection probe at the test point on the inner surface of the tubular reactor; wherein, the induced voltage signal includes voltage decay time and induced voltage amplitude;

[0076] S22, Based on the voltage decay time and induced voltage amplitude, generate induced voltage curve profiles under different time window conditions; wherein, the induced voltage curve profile is used to display the induced voltage change trend curves under different time windows, and the depressions in the induced voltage change trend curves indicate the location of defects with cracks on the inner surface of the tested tubular reactor.

[0077] It should be noted that in step S21, the interval between each test point on the inner surface of the tubular reactor 102 is set to 10 mm to 20 mm.

[0078] It should be noted that the principle behind drawing the induced voltage curve profile in step S22 is as follows:

[0079] M measuring points are collected on the inner surface of the tubular reactor 102, and N is the sampling time point in the induced voltage curve of each measuring point. Each time point is called a time window. Then the detection data of the i-th measuring point can be represented as a vector:

[0080] V i =[V i1 V i2 ,…,V iN ];

[0081] Where M represents the total number of measuring points; N represents the sampling time point in the induced voltage curve of each measuring point. V i V represents the vector in the i-th row of matrix W, where each V i The induced voltage curve represents a specific measuring point, where the value of i ranges from 1 to M.

[0082] The collected data from M measurement points are converted into matrix form as follows:

[0083]

[0084] Where W represents a matrix; V ij This represents the induced voltage amplitude at the i-th measuring point at the j-th sampling time. The value of i ranges from 1 to M, and the value of j ranges from 1 to N.

[0085] It should be noted that in step S22, referring to Figure 6 Based on the voltage decay time and the induced voltage amplitude, a profile of the induced voltage curve under different time windows is generated, with the voltage decay time as the abscissa and the voltage amplitude of the induced voltage signal as the ordinate. When a crack defect is detected on the inner surface of the tubular reactor 102, the induced voltage amplitude at the defective location shows a sharp drop trend with the increase of decay time, and this sharp drop trend is more obvious than that at the defect-free location.

[0086] It should be noted that in step S22, referring to Figure 6After the data collected at the measuring points is converted into a matrix form, the measuring points are used as the abscissa and the voltage amplitude of the induced voltage signal is used as the ordinate to generate induced voltage curve profiles under different time window states. When a crack defect is detected on the inner surface of the tubular reactor 102, the induced voltage curve profile of the defective part shows an asymmetrical "V" waveform.

[0087] It should be noted that in step S22, the induced voltage curve profile is obtained by slicing the induced voltage curve at different detection points and displaying the measurement results in the form of a vector diagram. Analyzing the late time window signal of the induced voltage signal to determine the crack defects on the inner wall of the tubular reactor 102 can avoid the disturbance to the induced voltage signal in the early time window caused by the excessive permeability of the tubular reactor 102, thus reducing the difficulty of signal analysis. In this embodiment, time windows 26# to 31# are selected to analyze the cracks on the inner surface of the tubular reactor 102.

[0088] Through steps S21 to S22, the induced voltage signal generated by the crack detection probe at the test point on the inner surface of the tubular reactor is received; wherein, the induced voltage signal includes voltage decay time and induced voltage amplitude; based on the voltage decay time and induced voltage amplitude, induced voltage curve profile diagrams under different time window states are generated; wherein, the induced voltage curve profile diagram is used to display the induced voltage change trend curves of different time windows, and the concave part of the induced voltage change trend curve indicates the defect location of the crack on the inner surface of the tested tubular reactor, which can detect the induced voltage amplitude of all test points on the inner surface of the tubular reactor and convert it into image form, making the detection results more obvious.

[0089] In one embodiment, the pulsed eddy current instrument 101 further includes: a display unit electrically connected to the data processing unit, comprising, but not limited to, the following steps:

[0090] After generating profile diagrams of induced voltage curves under different time window states, the method further includes:

[0091] S31, different colors are used to mark the induced voltage change trend curves under different time window states to obtain a colored induced voltage curve profile.

[0092] S32 displays a color profile of the induced voltage curve via a display unit.

[0093] It should be noted that, referring to Figures 7 to 8The pulsed eddy current instrument 101 can perform detailed analysis on a single induced voltage signal to obtain induced voltage curve profiles reflecting the detection results of longitudinal crack defects and transverse crack defects. The display unit of the pulsed eddy current instrument 101 can present the induced voltage curve profiles of the longitudinal crack defect detection results and transverse crack defect detection results as color images.

[0094] It should be noted that, referring to Figure 7 Depressions 3 to 7 represent the detection results of transverse cracks at the locations of the crack detection probe's measuring points; refer to Figure 8 Indentations 8 to 12 represent the detection results of longitudinal cracks at the measurement points where the crack detection probe is located. Referring to the detection results of transverse and longitudinal crack defects displayed on the display unit, it can be seen that the "V" waveform presented by the crack detection probe for transverse cracks is smoother, while the "V" waveform presented for longitudinal cracks is more tortuous. Therefore, it is evident that the crack detection probe has higher sensitivity to longitudinal cracks.

[0095] Through steps S31 and S32, different colors are used to identify the induced voltage change trend curves under different time window states, resulting in a colored induced voltage curve profile; the colored induced voltage curve profile is then displayed through the display unit. Presenting the induced voltage curve profiles of the longitudinal crack defect detection results and the transverse crack defect detection results in the tubular reactor as color images provides visualization.

[0096] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0097] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A crack detection probe, characterized in that: include: Two receiving units, each of which comprises: a receiving coil, a U-shaped magnetic core and a plurality of annular magnetic cores; the U-shaped magnetic core comprises a magnetic core body and an opening formed by bending the magnetic core body; the plurality of annular magnetic cores are sleeved on the magnetic core body, and each annular magnetic core is fixedly connected to the magnetic core body; the receiving coil is wound around the magnetic core body and the annular magnetic core; The excitation unit comprises an excitation coil and an annular member, wherein the excitation coil is wound around the annular member; the annular member is clamped in the opening; and the opposite first end face and second end face of the annular member are respectively in contact with the two inner side faces of the opening.

2. The crack detection probe according to claim 1, characterized in that: The projection shape of the annular magnetic core in the horizontal direction perpendicular to the paper surface and inward is a fan shape.

3. The crack detection probe according to claim 1, characterized in that: The opening distance of the opening portion is equal to the width between the first end surface and the second end surface of the annular member.

4. The crack detection probe according to claim 1, characterized in that: The spacing distance between two adjacent annular magnetic cores is equal.

5. A detection device, characterized in that: A crack detection probe comprising the crack detection probe according to any one of claims 1 to 4.

6. The detection device according to claim 5, characterized in that: The detection device also includes: The pulsed eddy current instrument comprises an excitation port and a receiving port, wherein the excitation port is connected to the excitation unit of the crack detection probe, and the receiving port is connected to the receiving unit of the crack detection probe.

7. The detection device according to claim 6, characterized in that: The pulsed eddy current instrument comprises: A pulse eddy current generating unit, comprising the excitation port; the pulse eddy current generating unit is used for: the pulse eddy current instrument generates a periodic square wave pulse current signal, and outputs the square wave pulse current signal to the excitation unit of the crack detection probe placed in the tubular reactor to be tested through the excitation port, so that the excitation coil of the excitation unit is alternately energized and de-energized, thereby forming a changing intracavity magnetic field in the tubular reactor to be tested; A voltage signal receiving unit, comprising the receiving port; the voltage signal receiving unit is used to: receive, through the receiving port, an induced voltage signal generated by the receiving coil of the crack detection probe under the changing intracavity magnetic field; A data processing unit is connected to the output end of the voltage signal receiving unit; the voltage signal receiving unit is used to perform data analysis and processing on the induced voltage signal to obtain an induced voltage curve profile.

8. A method for detecting cracks on the inner surface of a reactor, characterized in that: Applicable to the detection device as claimed in any one of claims 6 to 7; the detection device comprises: a pulsed eddy current instrument and a crack detection probe; The pulsed eddy current instrument generates a periodic square wave pulse current signal, and outputs the square wave pulse current signal to the excitation unit of the crack detection probe placed in the tubular reactor to be tested through the excitation port, so that the excitation coil of the excitation unit is alternately energized and de-energized, thereby forming a changing intracavity magnetic field in the tubular reactor to be tested; The pulsed eddy current instrument receives, through a receiving port, an induced voltage signal generated by a receiving coil of the crack detection probe under the changing magnetic field in the cavity; The pulsed eddy current instrument performs data analysis and processing on the induced voltage signal to obtain an induced voltage curve profile.

9. The method for detecting cracks on the inner surface of a reactor according to claim 8, characterized in that: The pulsed eddy current instrument receives the attenuated voltage signal generated by the receiving coil of the crack detection probe under the changing intracavity magnetic field, and further includes: Receiving the induced voltage signal generated by the crack detection probe at the inner surface of the tubular reactor at the test point; wherein the induced voltage signal includes a voltage decay time and an induced voltage amplitude; According to the voltage decay time and the induced voltage amplitude, a cross-sectional diagram of the induced voltage curve under different time window states is generated; wherein the cross-sectional diagram of the induced voltage curve is used to display the induced voltage change trend curve of different time windows, and the concave part of the induced voltage change trend curve indicates the defect position of the crack on the inner surface of the tubular reactor being measured.

10. The method for detecting cracks on the inner surface of a reactor according to claim 8, characterized in that: The pulsed eddy current instrument further comprises: a display unit, the display unit being electrically connected to the data processing unit; After generating the induced voltage curve profiles under different time window states, the method further includes: Using different colors to mark the induced voltage change trend curves in different time window states to obtain a colored induced voltage curve profile; The colorful induced voltage curve profile is displayed through the display unit.

Images