Probe group for large-variable-diameter magnetic flux leakage detector

Abstract

The invention relates to the technical field of magnetic flux leakage detection, in particular to a probe group for a large-variable-diameter magnetic flux leakage detector, which comprises a probe assembly, an auxiliary plate spring and a Z-shaped base, one ends of the probe assemblies are installed on two side plates of the Z-shaped base at intervals and matched with the probe assemblies, one ends of the auxiliary plate springs are correspondingly installed on the two side plates of the Z-shaped base, and the other ends of the auxiliary plate springs are connected with the probe assemblies respectively. And the support is used for supporting the probe assembly and positioning the probe assembly at an initial position. According to the probe group for the large-variable-diameter magnetic flux leakage detector, in practical application, when the pipe diameter is small, deformation of the probe assembly is reduced by welding seams or defects in a pipeline, when the pipe diameter is large, the probe assembly can be reset at the initial position all the time under the action of the auxiliary plate spring, and therefore the probe group can be suitable for detecting defects in pipelines with different pipe diameters.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic flux leakage detection, and in particular to a probe group for a large-diameter magnetic flux leakage detector. Background Art

[0002] Because pipelines are buried underground or on the seabed, after long-term operation, they may be damaged or corroded by geological damage, corrosion, and their own defects, which may affect the safe operation of the pipelines. Therefore, it is necessary to conduct internal inspections of the pipelines regularly. In actual engineering applications, the passing capacity of internal inspection instruments determines whether the internal inspection operation can be carried out normally. Conventional internal inspection instruments generally have a maximum deformation capacity of about 15% in straight pipe sections. However, due to pipeline repair and economic reasons, some or even all sections of the pipeline are designed as variable diameter pipelines, which are not suitable for the operation of conventional internal inspection instruments. In fact, according to NACE statistics, only 60% of the world's oil and gas pipelines are suitable for conventional pipeline internal inspection operations.

[0003] Therefore, there is an urgent need for a probe group for a large-diameter magnetic flux leakage detector, so that the large-diameter magnetic flux leakage detector can be better applied to various pipeline environments and no structural interference will occur during detection. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the large-diameter magnetic flux leakage detector in the prior art cannot be effectively applied to the defect detection in unconventional pipelines with different diameters, and to provide a probe group for the large-diameter magnetic flux leakage detector.

[0005] In order to achieve the above-mentioned object, the present invention provides a probe group for a large-diameter variable-diameter magnetic flux leakage detector, which comprises a probe assembly, an auxiliary leaf spring and a Z-shaped base; One ends of several of the probe assemblies are installed at intervals on the two side plates of the Z-shaped base, matching with several of the probe assemblies; one ends of several of the auxiliary leaf springs are correspondingly installed on the two side plates of the Z-shaped base, and the other ends are respectively connected to several of the probe assemblies, for supporting the probe assemblies and positioning them in the initial position.

[0006] Preferably, the probe assembly includes a connecting leaf spring, a hinge, a probe leaf spring, a rotating shaft, a probe housing, a wear-resistant sheet and a sensor; A first rotating shaft hole and a second rotating shaft hole are respectively provided on both sides of the probe housing, the hinge is installed on the first rotating shaft hole through the rotating shaft, the hinge, the probe leaf spring and the connecting leaf spring are stacked in sequence from top to bottom, one end of the connecting leaf spring is installed on the side plate of the Z-shaped base, one end of the auxiliary leaf spring is connected to the rotating shaft on the second rotating shaft hole, a hole groove is provided on the probe housing, the wear-resistant sheet is installed on the hole groove, and the sensor is arranged in the hole groove.

[0007] Preferably, the connecting leaf spring and the probe leaf spring are both obtuse-angled, the long sides of the obtuse-angled connecting leaf spring and the probe leaf spring are installed in a Z shape on the hinge, and the short sides of the connecting leaf spring are connected to the side plates of the Z-shaped base.

[0008] Preferably, the obtuse angle of the cross section of the connecting leaf spring is 115-125°, and the obtuse angle of the cross section of the probe leaf spring is 120-130°.

[0009] Preferably, the auxiliary leaf spring is obtuse-angled, the short side of the obtuse-angled auxiliary leaf spring is connected to the side plate of the Z-shaped base, and the end side of the long side is provided with a hook and connected to the shaft on the second shaft hole through the hook.

[0010] Preferably, the auxiliary leaf spring and the connecting leaf spring are mounted on the side plate of the Z-shaped base in a manner that their long sides face the same direction.

[0011] Preferably, the auxiliary leaf spring, the connecting leaf spring and the probe leaf spring are made of beryllium bronze material.

[0012] Preferably, the probe housing is made of PEEK or ABS plastic.

[0013] Preferably, a boss is provided at the bottom of the wear-resistant sheet, a return groove is provided on the boss, and the wear-resistant sheet is installed on the probe housing in a manner that the boss is embedded in the hole groove.

[0014] Preferably, the return groove and the hole groove are both coated with epoxy resin glue.

[0015] According to the above technical solution, based on the probe group for the large variable diameter magnetic flux leakage detector, one end of several of the probe assemblies is installed at intervals on the two side plates of the Z-shaped base, and matched with several of the probe assemblies, one end of several of the auxiliary leaf springs is correspondingly installed on the two side plates of the Z-shaped base, and the other end is respectively connected to several of the probe assemblies, which are used to support the probe assemblies and position them in the initial position. In actual application, when the pipe diameter is small, the probe assembly is pressed down and deformed by the weld or defect in the pipeline. When the pipe diameter is large, the probe assembly can always be reset to the initial position under the action of the auxiliary leaf spring, so that it can be suitable for defect detection in pipelines of different pipe diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of a probe group for a large variable diameter magnetic flux leakage detector; Figure 2 It is a structural diagram of the auxiliary leaf spring; Figure 3 It is a schematic diagram of the structure of the probe assembly; Figure 4 It is a schematic diagram of the exploded structure of the probe assembly; Figure 5 It is a schematic diagram of the structure of the probe housing; Figure 6 It is a schematic diagram of the structure of the wear-resistant sheet; Figure 7 It is a schematic diagram of the structure of the Z-type base; Figure 8 This is an application example diagram of a plurality of large variable diameter magnetic flux leakage detector probes assembled into a circular tube shape.

[0017] Description of Reference Numerals 1. Probe assembly; 11. Connecting leaf spring; 12. Hinge; 121. Hinge hole; 13. Probe leaf spring; 14, rotating shaft; 15, probe housing; 151, first rotating shaft hole; 152, hole groove; 153, second shaft hole; 16, wear-resistant sheet; 161, boss; 162, return groove; 17. Sensor; 2. Auxiliary leaf spring; 3. Z-shaped base; 31. Probe assembly fixing hole; 32. Threading hole; 33. Probe assembly fixing hole. DETAILED DESCRIPTION

[0018] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0019] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, features defined as "first" and "second" may explicitly or implicitly include one or more of the features; "plurality" means two or more. The term "include" and any variation thereof means non-exclusive inclusion, possible presence or addition of one or more other features, units, components and / or combinations thereof.

[0020] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected through an intermediate medium, or it can be internally connected between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0021] The present invention provides a probe group for a large variable diameter magnetic flux leakage detector, such as Figure 1-7 As shown, the probe group for the large variable diameter magnetic flux leakage detector includes a probe assembly 1, an auxiliary leaf spring 2 and a Z-shaped base 3; One ends of several of the probe assemblies 1 are installed at intervals on the two side plates of the Z-shaped base 3, and are matched with several of the probe assemblies 1. One ends of several of the auxiliary leaf springs 2 are correspondingly installed on the two side plates of the Z-shaped base 3, and the other ends are respectively connected to several of the probe assemblies 1, for supporting the probe assemblies 1 and positioning them in the initial position.

[0022] According to the above technical solution, based on the probe group for the large variable diameter magnetic flux leakage detector, in actual application, when the pipe diameter is small, the probe assembly is pressed down and deformed by the weld or defect in the pipeline, and when the pipe diameter is large, the probe assembly can always be reset to the initial position under the action of the auxiliary leaf spring, so that it can be applied to defect detection in pipelines of different pipe diameters. Specifically, the application example is Figure 8 As shown, by assembling multiple large variable diameter leakage magnetic flux detector probe groups into a circular tube shape, leakage magnetic flux detection of defects in different pipe diameters can be achieved. Especially when the pipe diameter becomes smaller and the magnetic circuit is deformed, multiple probe groups will not interfere with each other when they are in a staggered state.

[0023] In the probe set for the large variable diameter magnetic flux leakage detector of the present invention, preferably, Figure 3-6 As shown, the probe assembly 1 includes a connecting leaf spring 11, a hinge 12, a probe leaf spring 13, a rotating shaft 14, a probe housing 15, a wear-resistant sheet 16 and a sensor 17; A first rotating shaft hole 151 and a second rotating shaft hole 153 are respectively provided on both sides of the probe housing 15, the hinge 12 is installed on the first rotating shaft hole 151 through the rotating shaft 14, the hinge 12, the probe leaf spring 13 and the connecting leaf spring 11 are stacked in sequence from top to bottom, one end of the connecting leaf spring 11 is installed on the side plate of the Z-shaped base 3, one end of the auxiliary leaf spring 2 is connected to the rotating shaft 14 on the second rotating shaft hole 153, a hole groove 152 is provided on the probe housing 15, the wear-resistant sheet 16 is installed on the hole groove 152, and the sensor 17 is arranged in the hole groove 152.

[0024] In a specific embodiment, Figure 1 , 4 As shown in FIG. 7 , the connecting leaf spring 11 and the auxiliary leaf spring 2 are both mounted on the Z-shaped base 3 based on the fixing holes. In a preferred embodiment, the probe assembly fixing hole 31 on the Z-shaped base 3 is as shown in FIG. Figure 7 As shown in the arrangement; of course, it can also be in other forms, as long as multiple magnetic flux leakage detector probe groups can be finally assembled into a circular tube shape. In another specific embodiment, the hinge 12 is installed on the rotating shaft 14 through the hinge hole 121. The hinge 12, the probe leaf spring 13 and the connecting leaf spring 11 are stacked in sequence from top to bottom based on the corresponding fixing holes. Among them, the hinge 12 is made of 304 stainless steel material and is manufactured by stamping process to reduce the cost of mass production. In another specific embodiment, there are rivet holes at both ends of the rotating shaft 14. After correct connection and installation, special tools should be used for spot riveting to fix the rotating shaft axially.

[0025] In the present invention, by further providing a preferred embodiment of the probe assembly 1, in actual application, the probe group for the leakage magnetic flux detector can be further enabled to be better suitable for leakage magnetic flux detection of different pipe diameters, especially based on the connecting leaf spring 11 and the auxiliary leaf spring 2 being used together to support the main body of the probe assembly 1 and position it in the initial position, which can be better suitable for leakage magnetic flux detection of different pipe diameters.

[0026] In the probe set for the large variable diameter magnetic flux leakage detector of the present invention, preferably, Figure 3 and 4 As shown, the connecting leaf spring 11 and the probe leaf spring 13 are both obtuse-angled, and the long sides of the obtuse-angled connecting leaf spring 11 and the probe leaf spring 13 are installed in a Z shape on the hinge 12, and the short sides of the connecting leaf spring 11 are connected to the side panels of the Z-shaped base 3.

[0027] In a further preferred embodiment, the cross-sectional obtuse angle of the connecting leaf spring 11 is 115-125°, preferably 118-123°, most preferably 120°, and the cross-sectional obtuse angle of the probe leaf spring 13 is 120-130°, preferably 123-127°, most preferably 125°.

[0028] In the present invention, by further designing the connecting leaf spring 11 and the probe leaf spring 13 into an obtuse shape, and the long sides of the obtuse connecting leaf spring 11 and the probe leaf spring 13 are installed in a Z shape on the hinge 12, and the obtuse angles of the connecting leaf spring 11 and the probe leaf spring 13 are further optimized and designed, in actual application, it can be better suitable for leakage magnetic detection of different pipe diameters, especially the cross-sectional obtuse angle of the probe leaf spring 13 is 125°, which is 5° larger than the cross-sectional obtuse angle of the connecting leaf spring 11 of 120°, which can compensate for the fall caused by the deadweight of the probe assembly 1 during installation, so that the probe remains parallel to the center line of the pipeline.

[0029] In the probe set for the large variable diameter magnetic flux leakage detector of the present invention, preferably, Figure 1 , 2 As shown in FIG. 4 , the auxiliary leaf spring 2 is obtuse-angled, the short side of the obtuse-angled auxiliary leaf spring 2 is connected to the side plate of the Z-shaped base 3, and the long side end is provided with a hook 21 and connected to the rotating shaft 14 on the second rotating shaft hole 153 through the hook 21.

[0030] In the present invention, by further providing a preferred implementation of the auxiliary leaf spring 2, in actual application, it can be better used to support the probe assembly 1 and position it at the initial position.

[0031] In the probe set for the large variable diameter magnetic flux leakage detector of the present invention, preferably, the auxiliary leaf spring 2 and the connecting leaf spring 11 are installed on the side plate of the Z-shaped base 3 in a manner that the long sides are oriented in the same direction, that is, Figure 1 The installation shown is better suited for magnetic flux leakage detection of pipes with different diameters.

[0032] In the probe set for the large variable diameter magnetic flux leakage detector of the present invention, preferably, the auxiliary leaf spring 2, the connecting leaf spring 11 and the probe leaf spring 13 are made of beryllium copper material. Since beryllium copper material has no magnetic conductivity, it can effectively prevent the structure from interfering with the magnetic flux leakage sensor and affecting the detection result of the probe.

[0033] In the probe set for the large variable diameter magnetic flux leakage detector of the present invention, preferably, the probe housing 15 is made of PEEK or ABS plastic by injection molding to avoid the influence of metal material on the signal collection of the sensor in a magnetic field environment.

[0034] In the probe group for the large variable diameter magnetic flux leakage detector described in the present invention, preferably, a boss 161 is provided at the bottom of the wear-resistant plate 16, and a return groove 162 is opened on the boss 161. The wear-resistant plate 16 is installed on the probe housing 15 by embedding the boss 161 into the hole groove 152.

[0035] In the present invention, the wear-resistant sheet 16 is installed on the probe housing 15 by embedding the boss 161 into the hole 152, and further the return groove 162 and the hole 152 are coated with epoxy resin glue, which can be used to better protect the sensor 17. Furthermore, 502 glue can be applied to the contact surface between the boss 161 and the probe housing 15 to better protect the sensor 17. The wear-resistant sheet 16 is made of zirconium oxide and is made by powder sintering process, so it has higher wear resistance and increases the service life of the probe in the pipeline. In a specific embodiment, after the sensor 17 is wrapped by the probe housing 1515 and the wear-resistant sheet 16, when it is covered with epoxy resin sealing glue, the thickness of the glue layer should be greater than the sensor cable diameter + 1mm. Specifically, the sensor 17 is a sensor for magnetic leakage detection.

[0036] In the present invention, if Figure 7 As shown, a threading hole 32 is provided on the side plate of the Z-shaped base 3, so as to facilitate the overlapping of the probe cable. Further, probe group fixing holes 33 are provided at both ends of the curved middle connecting plate of the Z-shaped base 3, so that multiple magnetic flux leakage detectors can be better assembled into a circular tube using a probe group.

[0037] In the present invention, Figure 8 As shown, the probe group for the large variable diameter magnetic flux leakage detector of the present invention is the detection probe part in the pipeline magnetic flux leakage internal detection, which is installed on the pipeline magnetic flux leakage internal detector as a whole, evenly distributed in a circle, and the front of the probe is in the same direction as the front of the detector. The structure of the large variable diameter magnetic flux leakage detector is a retractable structure, and its diameter can change with the inner diameter of the pipeline. A probe group for the large variable diameter magnetic flux leakage detector is fixed to the outer edge of the detector through the probe group fixing hole 33, and will shrink with the detector. When the detector shrinks, the circumferential spacing of the probe group is reduced and staggered, avoiding the generation of interference of the probe group.

[0038] The present invention will be described in detail below through examples, but the protection scope of the present invention is not limited thereto.

[0039] Example 1 Use Figure 1-7 The probe set for the large variable diameter magnetic flux leakage detector shown is implemented, specifically, the probe set for the large variable diameter magnetic flux leakage detector comprises a probe assembly 1, an auxiliary leaf spring 2 and a Z-shaped base 3; One end of the plurality of probe assemblies 1 is installed at intervals on the two side plates of the Z-shaped base 3, and is matched with the plurality of probe assemblies 1; one end of the plurality of auxiliary leaf springs 2 is correspondingly installed on the two side plates of the Z-shaped base 3, and the other end is respectively connected to the plurality of probe assemblies 1, and is used to support the probe assemblies 1 and position them at the initial position; The probe assembly 1 includes a connecting leaf spring 11, a hinge 12, a probe leaf spring 13, a rotating shaft 14, a probe housing 15, a wear-resistant sheet 16 and a sensor 17; a first rotating shaft hole 151 and a second rotating shaft hole 153 are respectively provided on both sides of the probe housing 15, the hinge 12 is installed on the first rotating shaft hole 151 through the rotating shaft 14, the hinge 12, the probe leaf spring 13 and the connecting leaf spring 11 are stacked in sequence from top to bottom, one end of the connecting leaf spring 11 is installed on the side plate of the Z-shaped base 3, one end of the auxiliary leaf spring 2 is connected to the rotating shaft 14 on the second rotating shaft hole 153, a hole groove 152 is provided on the probe housing 15, the wear-resistant sheet 16 is installed on the hole groove 152, and the sensor 17 is arranged in the hole groove 152; the hinge 12 is installed on the rotating shaft 14 through the hinge hole 121.

[0040] After testing, it was found that the probes of the large variable diameter magnetic flux leakage detector of the present invention were assembled into the following Figure 8 The circular tube shape shown is applied to the large variable diameter magnetic flux leakage detector. In actual application, the large variable diameter magnetic flux leakage detector can be better applicable to the magnetic flux leakage detection of defects in different pipe diameters.

[0041] Example 2 Implementation is made with reference to Example 1, but different therefrom, the connecting leaf spring 11 and the probe leaf spring 13 are both obtuse-angled, the long sides of the obtuse-angled connecting leaf spring 11 and the probe leaf spring 13 are mounted on the hinge 12 in a Z shape, and the short side of the connecting leaf spring 11 is connected to the side plate of the Z-shaped base 3; the obtuse angle of the cross section of the connecting leaf spring 11 is 120°, and the obtuse angle of the cross section of the probe leaf spring 13 is 125°; the auxiliary leaf spring 2 is obtuse-angled, the short side of the obtuse-angled auxiliary leaf spring 2 is connected to the side plate of the Z-shaped base 3, and a hook 21 is provided on the end side of the long side and connected to the rotating shaft 14 on the second rotating shaft hole 153 through the hook 21; the auxiliary leaf spring 2 and the connecting leaf spring 11 are mounted on the side plate of the Z-shaped base 3 in a manner with their long sides facing the same direction; the auxiliary leaf spring 2, the connecting leaf spring 11 and the probe leaf spring 13 are made of beryllium bronze material; the probe housing 15 is made of PEEK or ABS plastic.

[0042] After testing, it was found that the probes of the large variable diameter magnetic flux leakage detector of the present invention were assembled into the following Figure 8 The circular tube shape shown is applied to the large variable diameter magnetic flux leakage detector. In actual application, the large variable diameter magnetic flux leakage detector can be better suitable for magnetic flux leakage detection of defects in different pipe diameters.

[0043] Example 3 Refer to Example 2 for implementation, except that a boss 161 is provided at the bottom of the wear-resistant sheet 16, a return groove 162 is provided on the boss 161, and the wear-resistant sheet 16 is installed on the probe housing 15 by embedding the boss 161 into the hole 152; both the return groove 162 and the hole 152 are coated with epoxy resin glue.

[0044] After testing, it was found that the probes of the large variable diameter magnetic flux leakage detector of the present invention were assembled into the following Figure 8 The circular tube shape shown is applied to the large variable diameter magnetic flux leakage detector. In actual application, the large variable diameter magnetic flux leakage detector can be better suitable for magnetic flux leakage detection of defects in different pipe diameters.

[0045] The probe group for the large variable diameter magnetic flux leakage detector provided by the present invention, in actual application, when the pipe diameter is small, the probe assembly is pressed down and deformed by the weld or defects in the pipeline, and when the pipe diameter is large, the probe assembly can always be reset to the initial position under the action of the auxiliary leaf spring, so that it can be suitable for defect detection in pipelines of different diameters.

[0046] The preferred embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A probe set for a large variable diameter magnetic flux leakage detector, characterized in that: The probe assembly for a large-diameter magnetic flux leakage detector comprises a probe assembly (1), an auxiliary leaf spring (2) and a Z-shaped base (3); One end of the plurality of probe assemblies (1) is installed at intervals on the two side plates of the Z-shaped base (3) to match the plurality of probe assemblies (1); one end of the plurality of auxiliary leaf springs (2) is correspondingly installed on the two side plates of the Z-shaped base (3), and the other end is respectively connected to the plurality of probe assemblies (1) to support the probe assemblies (1) and position them at the initial position.

2. The probe set for a large variable diameter magnetic flux leakage detector according to claim 1, characterized in that: The probe assembly (1) comprises a connecting leaf spring (11), a hinge (12), a probe leaf spring (13), a rotating shaft (14), a probe housing (15), a wear-resistant sheet (16) and a sensor (17); A first rotating shaft hole (151) and a second rotating shaft hole (153) are respectively provided on both sides of the probe housing (15); the hinge (12) is mounted on the first rotating shaft hole (151) via the rotating shaft (14); the hinge (12), the probe leaf spring (13) and the connecting leaf spring (11) are stacked in sequence from top to bottom; one end of the connecting leaf spring (11) is mounted on a side plate of the Z-shaped base (3); one end of the auxiliary leaf spring (2) is connected to the rotating shaft (14) on the second rotating shaft hole (153); a hole groove (152) is provided on the probe housing (15); the wear-resistant sheet (16) is mounted on the hole groove (152); and the sensor (17) is arranged in the hole groove (152).

3. The probe set for a large variable diameter magnetic flux leakage detector according to claim 2, characterized in that: The connecting leaf spring (11) and the probe leaf spring (13) are both obtuse-angled, and the long sides of the obtuse-angled connecting leaf spring (11) and the probe leaf spring (13) are mounted on the hinge (12) in a Z shape, and the short sides of the connecting leaf spring (11) are connected to the side plates of the Z-shaped base (3).

4. The probe set for a large variable diameter magnetic flux leakage detector according to claim 3, characterized in that: The obtuse angle of the cross section of the connecting leaf spring (11) is 115-125°, and the obtuse angle of the cross section of the probe leaf spring (13) is 120-130°.

5. The probe set for a large variable diameter magnetic flux leakage detector according to claim 3 or 4, characterized in that: The auxiliary leaf spring (2) is obtuse-angled, the short side of the obtuse-angled auxiliary leaf spring (2) is connected to the side plate of the Z-shaped base (3), and the end side of the long side is provided with a hook (21) and connected to the rotating shaft (14) on the second rotating shaft hole (153) through the hook (21).

6. The probe set for a large variable diameter magnetic flux leakage detector according to claim 5, characterized in that: The auxiliary leaf spring (2) and the connecting leaf spring (11) are mounted on the side plate of the Z-shaped base (3) in a manner such that their long sides face the same direction.

7. The probe set for a large variable diameter magnetic flux leakage detector according to claim 2, characterized in that: The auxiliary leaf spring (2), the connecting leaf spring (11) and the probe leaf spring (13) are made of beryllium bronze material.

8. The probe set for a large variable diameter magnetic flux leakage detector according to claim 2, characterized in that: The probe housing (15) is made of PEEK or ABS plastic.

9. The probe set for a large variable diameter magnetic flux leakage detector according to claim 2, characterized in that: A boss (161) is provided at the bottom of the wear-resistant sheet (16), a return groove (162) is provided on the boss (161), and the wear-resistant sheet (16) is installed on the probe housing (15) in a manner that the boss (161) is embedded in the hole groove (152).

10. The probe set for a large variable diameter magnetic flux leakage detector according to claim 9, characterized in that: The return groove (162) and the hole groove (152) are both coated with epoxy resin glue; and the wear-resistant sheet (16) is made of zirconium oxide material.

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