A magnetic particle flaw detection device for pipeline inspection

Abstract

The present invention belongs to the technical field of pipeline magnetic particle flaw detection, and specifically relates to a magnetic particle flaw detection device for pipeline detection, comprising: a handheld base; a yoke, mounted on the handheld base, the yoke forming at least two legs extending along a first direction; a coil, wound around the yoke, and the coil is electrically connected to a power supply module; a probe, arranged one-to-one with the legs, the probe being hinged to the end of the leg through a pivot; a guide wheel, the guide wheel being rotatably arranged on a guide wheel bracket, the guide wheel bracket being movably connected to the probe, so that the wheel surface of the guide wheel can protrude from the outer side of the end face of the probe or converge to the inner side of the end face of the probe. The magnetic particle flaw detection device provided by the present invention is easy to move along the pipeline, and can stay at any position of the pipeline, so as to facilitate continuous magnetization of a specific area and reduce the labor intensity of the operator.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline magnetic particle flaw detection, and in particular relates to a magnetic particle flaw detection device for pipeline detection. Background Art

[0002] A magnetic detector is a commonly used metal flaw detection device that applies a magnetic field to the workpiece to be tested through a magnetic yoke. Under normal circumstances, since the workpiece to be tested and the magnetic yoke form a closed magnetic circuit, most of the magnetic field will pass through the inside of the workpiece to be tested. When there are cracks on the surface or inside of the workpiece to be tested, the magnetic field will generate leakage magnetic flux at the cracks. At this time, soft magnetic powder is coated on the surface of the workpiece to be tested, and the soft magnetic powder will gather at the cracks, making it easier for operators to identify the specific location and distribution of the cracks. When using a magnetic detector to detect pipelines, in order to facilitate the movement of the magnetic yoke probe along the surface of the pipeline, a guide wheel is generally set at the bottom of the probe to reduce the movement resistance. However, in actual applications, sometimes the probe needs to stay in a specific area of ​​the pipeline for continuous magnetization. At this time, due to the presence of the guide wheel, the probe cannot be adsorbed in the specific area by its own magnetic attraction, but will roll along the outer wall of the pipeline to the lowest point of the pipeline. Therefore, when faced with this scenario, the operator can only keep the probe in the specific area by hand, which increases the labor intensity of the staff. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a magnetic particle flaw detection device for pipeline inspection, which is easy to move along the pipeline and can stay at any position of the pipeline.

[0004] In order to achieve the above-mentioned and other related purposes, the present invention provides a magnetic particle flaw detection device for pipeline inspection, comprising:

[0005] Handheld dock;

[0006] A yoke mounted on the handheld base, the yoke forming at least two legs extending along a first direction;

[0007] A coil, wound around the magnetic yoke, and the coil is electrically connected to the power supply module;

[0008] Probes are arranged one by one corresponding to the legs, and the probes are hinged to the ends of the legs through a pivot;

[0009] A guide wheel is rotatably arranged on a guide wheel bracket, and the guide wheel bracket is movably connected to the probe so that the wheel surface of the guide wheel can protrude from the outer side of the end surface of the probe or converge to the inner side of the end surface of the probe; the end surface of the probe is the surface of the probe used to contact the workpiece to be measured.

[0010] In an optional embodiment of the present invention, the guide wheel bracket is hinged to the probe, and the guide wheel bracket is restricted to swing between a first angle and a second angle. When the guide wheel bracket is at the first angle, the wheel surface of the guide wheel protrudes from the end surface of the probe, and when the guide wheel bracket is at the second angle, the wheel surface of the guide wheel converges to the inner side of the end surface of the probe.

[0011] In an optional embodiment of the present invention, it also includes a holding mechanism, which is equipped to be able to switch between a holding position and a releasing position. When located at the holding position, the holding mechanism maintains the guide wheel bracket at the first angle at the first angle. When located at the releasing position, the guide wheel bracket at the first angle can switch to the second angle under the action of an external force applied by the workpiece to be measured.

[0012] In an optional embodiment of the present invention, the holding mechanism includes a guide column, a stop sleeve and a stop shoe, the guide column is fixed or rotatably arranged relative to the yoke or the probe, the axial direction of the guide column is parallel to the swing axis of the guide wheel bracket, the stop sleeve is slidably connected to the guide column along the axial direction of the guide column, and switches between a first position and a second position along the axial direction of the guide column, and the stop shoe is fixedly connected to the guide wheel bracket; when the holding mechanism is located at the holding position, the stop shoe on the guide wheel bracket located at the first angle conflicts with the stop sleeve located at the first position to prevent the guide wheel bracket from swinging to the second angle; when the holding mechanism is located at the release position, the stop sleeve located at the second position avoids the stop shoe to allow the guide wheel bracket to swing freely between the first angle and the second angle.

[0013] In an optional embodiment of the present invention, the guide column is coaxially arranged with the pivot axis.

[0014] In an optional embodiment of the present invention, a driving mechanism is further included, and the driving mechanism is used to drive the stop sleeve to switch between the first position and the second position.

[0015] In an optional embodiment of the present invention, the driving mechanism includes a first elastic element and a pull wire, the first elastic element is assembled so that its elastic force can drive the block sleeve to move from the second position to the first position, one end of the pull wire is connected to the block sleeve, and the other end is connected to a pressing handle provided on the handheld base, for driving the block sleeve to move from the first position to the second position.

[0016] In an optional embodiment of the present invention, a second elastic element is further provided between the guide wheel bracket and the probe, and the second elastic element is configured so that its elastic force can drive the guide wheel bracket to swing from the second angle to the first angle.

[0017] In an optional embodiment of the present invention, two pairs of guide wheels are correspondingly arranged for each of the probes, and the two pairs of guide wheels are respectively installed on two different guide wheel brackets, the two guide wheel brackets are arranged in an open and close manner, and the two guide wheel brackets share the same retaining mechanism.

[0018] In an optional embodiment of the present invention, four of the legs and four of the probes are respectively provided, wherein the two legs located on the front side are coaxial with the pivot between the probes, and the retaining mechanisms corresponding to the two probes share the same guide column; the two legs located on the rear side are coaxial with the pivot between the probes, and the retaining mechanisms corresponding to the two probes share the same guide column.

[0019] The technical effect of the present invention is that: the present invention improves the guide wheel of the magnetic detector so that its wheel surface can protrude from the outer side of the end face of the probe or converge to the inner side of the end face of the probe; when the wheel surface protrudes from the outer side of the end face of the probe, the magnetic detector contacts the pipeline through the guide wheel, and at this time, the movement resistance of the magnetic detector is small, which is convenient for moving along the surface of the pipeline; when the wheel surface converges to the inner side of the end face of the probe, the magnetic detector contacts the pipeline through the probe, and the probe and the pipeline are tightly attracted together under the action of magnetic attraction, which can effectively prevent the magnetic detector from moving along the surface of the pipeline, so that the magnetic detector can still be maintained at a specific position of the pipeline when it is out of hand, which is convenient for continuous magnetization of a specific area and reduces the labor intensity of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the use state of the magnetic particle flaw detection device provided by an embodiment of the present invention;

[0021] Figure 2 is a three-dimensional diagram of a magnetic particle flaw detection device provided by an embodiment of the present invention;

[0022] Figure 3 yes Figure 2 I partial enlarged view;

[0023] Figure 4 is a front view of a magnetic particle flaw detection device provided by an embodiment of the present invention;

[0024] Figure 5 yes Figure 4 AA section view;

[0025] Figure 6 yes Figure 5 BB cross-sectional view;

[0026] Figure 7 yes Figure 3 a perspective view of the position shown in another state;

[0027] Figure 8 yes Figure 5 A cross-sectional view showing the position in another state;

[0028] Fig. 9 yes Figure 8 CC section view;

[0029] Explanation of the reference numerals: 1. Pipe; 10. Base; 20. Yoke; 21. Leg; 30. Coil; 40. Probe; 41. Pivot; 50. Guide wheel; 51. Guide wheel bracket; 52. Stop shoe; 53. Second elastic element; 60. Pressing handle; 61. Guide column; 62. Stop sleeve; 63. Pull wire; 64. First elastic element. DETAILED DESCRIPTION

[0030] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0031] It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present invention in a schematic manner, and thus the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0032] Magnetic particle flaw detector (magnetic detector for short) is a non-destructive testing equipment used to detect surface cracks and defects. It mainly includes power supply system, magnetization system, magnetic powder application system, lighting system, evaluation system, etc. The power supply system provides electricity to drive the magnetic particle flaw detector to work; the magnetization system includes electromagnets or permanent magnets, which are used to generate magnetic fields. The magnetic particle flaw detector introduces magnetic powder by applying a magnetic field on the object to be tested in order to find cracks and defects; the magnetic powder application system usually uses powder spraying or immersion to apply magnetic powder to the surface of the object to be tested. These magnetic powders will gather at cracks and defects under the action of the magnetic field to form visible magnetic powder traces; the lighting system is used to illuminate the surface of the object to be tested so that the operator can clearly observe the magnetic powder traces; the evaluation system includes a magnifying glass, a microscope or a camera system, which is used to check and evaluate the characteristics of the magnetic powder traces. The surface of the object to be inspected is magnetized by an electromagnet or a permanent magnet to generate a local magnetic field. The strength and direction of this magnetic field can be adjusted according to the detection needs. Under the action of the magnetic field, magnetic powder is evenly applied to the surface of the object to be inspected. Magnetic powder is a kind of ferromagnetic particle, usually ferrite or iron powder. Under the action of the magnetic field, the magnetic powder will gather at the surface cracks or defects, forming obvious magnetic powder traces. The operator uses the lighting system to check and evaluate these traces to determine the location, size and shape of the cracks. The detected magnetic powder traces are observed and recorded by the evaluation system. The operator can judge the severity of the cracks and whether further measures are needed based on the characteristics of the traces.

[0033] See also Figure 1 As shown, when the magnetic detector is used to detect the pipeline 1, in order to facilitate the movement of the magnetic detector along the surface of the pipeline 1, a guide wheel 50 is generally provided at the bottom of the probe 40 to reduce the movement resistance. However, in practical applications, sometimes the probe 40 needs to stay in a specific area of ​​the pipeline 1 for continuous magnetization, such as Figure 1 In the position shown, due to the existence of the guide wheel 50, the probe 40 cannot be adsorbed in the specific area by its own magnetic attraction, but will slide along the outer wall of the pipeline 1 to the lowest point of the pipeline 1. Therefore, when the operator faces this scenario, he can only keep the probe 40 in the specific area by hand, which increases the labor intensity of the staff. To this end, the present invention improves the guide wheel 50 of the magnetic detector so that its wheel surface can protrude from the outer side of the end surface of the probe 40 or converge to the inner side of the end surface of the probe 40; when the wheel surface protrudes from the outer side of the end surface of the probe 40, the magnetic detector contacts the pipeline 1 through the guide wheel 50. At this time, the movement resistance of the magnetic detector is small, which is convenient for moving along the surface of the pipeline 1; when the wheel surface converges to the inner side of the end surface of the probe 40, the magnetic detector contacts the pipeline 1 through the probe 40, and the probe 40 and the pipeline 1 are tightly attracted together under the action of magnetic attraction, which can effectively prevent the magnetic detector from moving along the surface of the pipeline 1, so that the magnetic detector can still be maintained at a specific position of the pipeline 1 when it is out of hand, which is convenient for continuous magnetization of a specific area and reduces the labor intensity of the operator.

[0034] See also Figure 2-Figure 9 As shown, the technical solution of the present invention is described in detail below in conjunction with specific embodiments:

[0035] See also Figure 2 , Figure 3 As shown, the magnetic particle flaw detection device for pipeline inspection provided by the embodiment of the present invention includes a handheld base 10, a yoke 20, a coil 30, a probe 40 and a guide wheel 50; in a specific embodiment, the yoke 20 and the probe 40 are both formed by stacking multiple pieces of ferromagnetic materials. The yoke 20 is installed on the handheld base 10, and the yoke 20 forms at least two legs 21 extending along a first direction; the coil 30 is wound around the yoke 20, and the coil 30 is electrically connected to the power supply module; when the coil 30 is energized, a magnetic field is generated in the yoke 20. The probe 40 is arranged one-to-one with the legs 21, and the probe 40 is hinged to the end of the leg 21 through a pivot 41; as shown Figure 1 As shown, the angle of the probe 40 can be adjusted to adapt to different pipe diameters. The guide wheel 50 is rotatably arranged on the guide wheel bracket 51, and the guide wheel bracket 51 is movably connected to the probe 40, so that the wheel surface of the guide wheel 50 can protrude from the outer side of the end surface of the probe 40 or converge to the inner side of the end surface of the probe 40; the end surface of the probe 40 is the surface of the probe 40 for contacting the workpiece to be measured, the guide wheel 50 and the guide wheel bracket 51 can be made of ferromagnetic materials, and the magnetic field of the probe 40 can be transmitted to the inside of the workpiece to be measured through the guide wheel bracket 51 and the guide wheel 50.

[0036] It should be understood that when the wheel surface protrudes from the outer side of the end surface of the probe 40, the device contacts the pipeline 1 through the guide wheel 50. At this time, the movement resistance of the device is small, which is convenient for moving along the surface of the pipeline 1. When the wheel surface converges to the inner side of the end surface of the probe 40, the device contacts the pipeline 1 through the probe 40. The probe 40 and the pipeline 1 are tightly attracted together under the action of magnetic attraction, which can effectively prevent the device from moving along the surface of the pipeline 1, so that the device can still be maintained at a specific position of the pipeline 1 when it is out of hand, which is convenient for continuous magnetization of a specific area and reduces the labor intensity of the operator.

[0037] See also Figure 1-Figure 4As shown, in an optional embodiment of the present invention, the guide wheel bracket 51 is hinged to the probe 40, and the guide wheel bracket 51 is limited to swing between a first angle and a second angle. When the guide wheel bracket 51 is at the first angle, the wheel surface of the guide wheel 50 protrudes from the end surface of the probe 40, and when the guide wheel bracket 51 is at the second angle, the wheel surface of the guide wheel 50 converges to the inner side of the end surface of the probe 40. It should be understood that in some other embodiments, the guide wheel bracket 51 can also be slidably connected to the probe 40 to achieve the protrusion and convergence of the guide wheel 50, for example, the guide wheel bracket 51 can be slidably connected to the probe 40 along the first direction.

[0038] See also Figure 3 , Figure 5 , Figure 7 , Figure 8 As shown, in an optional embodiment of the present invention, it also includes a holding mechanism, which is equipped to be able to switch between a holding position and a releasing position. When located at the holding position, the holding mechanism maintains the guide wheel bracket 51 at the first angle at the first angle. When located at the releasing position, the guide wheel bracket 51 at the first angle can switch to the second angle under the action of an external force applied by the workpiece to be measured.

[0039] For details, please refer to Figure 5 , Figure 6 , Figure 8 , Fig. 9 As shown, the holding mechanism includes a guide column 61, a stop sleeve 62 and a stop shoe 52, the guide column 61 is fixedly or rotatably arranged relative to the yoke 20 or the probe 40, the axial direction of the guide column 61 is parallel to the swing axis of the guide wheel bracket 51, the stop sleeve 62 is slidably connected to the guide column 61 along the axial direction of the guide column 61, and switches between a first position and a second position along the axial direction of the guide column 61, and the stop shoe 52 is fixedly connected to the guide wheel bracket 51; when the holding mechanism is located at the holding position, the stop shoe 52 on the guide wheel bracket 51 located at the first angle conflicts with the stop sleeve 62 located at the first position to prevent the guide wheel bracket 51 from swinging to the second angle; when the holding mechanism is located at the releasing position, the stop sleeve 62 located at the second position avoids the stop shoe 52 to allow the guide wheel bracket 51 to swing freely between the first angle and the second angle.

[0040] In a specific embodiment, the components included in the holding mechanism can be made of non-ferromagnetic materials. This can prevent the magnetic field of the probe 40 from hindering the state switching of the holding mechanism, and can also prevent the holding mechanism from interfering with the magnetic field and generating unnecessary magnetic leakage.

[0041] See also Figure 4 , Figure 6 As shown, in an optional embodiment of the present invention, the guide post 61 is coaxially arranged with the pivot 41. The beneficial effect of such arrangement is that no matter what angle the probe 40 swings to, the relative position of the probe 40 and the guide post 61 can always remain unchanged, and the retaining shoe 52 can always remain in a state of conflict with the retaining sleeve 62. At the same time, the relative position between the guide post 61, the magnetic yoke 20 and the handheld base 10 also remains unchanged, which is convenient for the subsequent setting of the driving mechanism.

[0042] See also Figure 1-Figure 4 , Figure 7 As shown, in an optional embodiment of the present invention, a driving mechanism is further included, and the driving mechanism is used to drive the stopper 62 to switch between the first position and the second position. Specifically, the driving mechanism includes a first elastic element 64 and a pull wire 63, and the first elastic element 64 is assembled so that its elastic force can drive the stopper 62 to move from the second position to the first position, and one end of the pull wire 63 is connected to the stopper 62, and the other end is connected to the pressing handle 60 provided on the handheld base 10, and is used to drive the stopper 62 to move from the first position to the second position. It should be understood that the specific form of the driving mechanism is not unique. For example, in some other embodiments, the pull wire 63 can be replaced by an electric driving element.

[0043] See also Figure 5 , Figure 8 As shown, in an optional embodiment of the present invention, a second elastic element 53 is further provided between the guide wheel bracket 51 and the probe 40, and the second elastic element 53 is installed so that its elastic force can drive the guide wheel bracket 51 to swing from the second angle to the first angle. It should be understood that when the stopper sleeve 62 is pulled out from between the stopper shoe 52 and the guide column 61, the stopper shoe 52 will abut against the guide column 61. At this time, even if the pull wire 63 is released, the stopper sleeve 62 will be blocked by the stopper shoe 52 and cannot be reset. For this reason, the present invention is provided with the above-mentioned second elastic element 53. When the pull wire 63 is released and the probe 40 is separated from the pipeline 1, the guide wheel bracket 51 can be reset to the first angle under the action of the second elastic element 53. Figure 5 In the state shown, the pull line 63 is released at this time, and the stopper 62 can be automatically reset. It should be understood that in some other embodiments, the guide wheel bracket 51 can also be reset manually or by its own gravity.

[0044] In a specific embodiment, the first elastic element 64 may be, for example, a compression spring, and the second elastic element 53 may be, for example, a torsion spring.

[0045] See also Figure 1-Figure 9As shown, in an optional embodiment of the present invention, each of the probes 40 is provided with two pairs of guide wheels 50, and the two pairs of guide wheels 50 are respectively installed on two different guide wheel brackets 51, and the two guide wheel brackets 51 are arranged in an open and close manner, and the two guide wheel brackets 51 share the same holding mechanism. It should be understood that each of the probes 40 is provided with two pairs of guide wheels 50, which can realize automatic adjustment of the angle of the probe 40, ensuring that the probe 40 is always facing the outer wall of the pipeline 1 along the normal direction of the pipeline 1, as shown in FIG. Figure 1 shown.

[0046] See also Figure 2 As shown, in an optional embodiment of the present invention, the legs 21 and the probes 40 are respectively provided with four, wherein the two legs 21 located on the front side are coaxial with the pivot 41 between the probes 40, and the holding mechanisms corresponding to the two probes 40 share the same guide column 61; the two legs 21 located on the rear side are coaxial with the pivot 41 between the probes 40, and the holding mechanisms corresponding to the two probes 40 share the same guide column 61, so as to simplify the equipment structure. The pull wires 63 corresponding to the four probes 40 can be connected to the same pressing handle 60, and the operation process is simple and convenient. It should be noted that the above-mentioned front side and rear side refer to the front side and rear side of the movement direction of the magnetic particle flaw detection device, respectively.

[0047] The working principle of the holding mechanism is as follows: when the magnetic particle inspection device needs to be dragged along the surface of the pipeline 1, the holding mechanism is in Figure 3 , Figure 5 , Figure 6 In the state shown, the guide wheel bracket 51 is blocked by the stopper sleeve 62 and cannot swing, thereby achieving the support of the guide wheel 50 on the probe 40 and reducing the resistance between the probe 40 and the pipeline 1; when the magnetic particle flaw detection device needs to be fixed at a certain position of the pipeline 1, the stopper sleeve 62 is driven to move to Figure 7 , 9 In the state shown, the guide wheel bracket 51 loses the constraint of the stopper sleeve 62, so that the guide wheel bracket 51 can swing. At this time, the probe 40 can be adsorbed on the surface of the pipeline 1 under the action of magnetic attraction. At the same time, the guide wheel bracket 51 swings to the Figure 8 In the state shown, the friction between the probe 40 and the pipe 1 is relatively large, so the magnetic particle inspection device can be kept at a specific position of the pipe 1, for example Figure 1 When the magnetic particle inspection device needs to be moved again, the coil 30 can be powered off first. At this time, the magnetic field disappears, and the operator can easily lift the magnetic particle inspection device. The guide wheel bracket 51 is reset under the action of the second elastic element 53, and the retaining shoe 52 makes room for the retaining sleeve 62. The retaining sleeve 62 is reset under the action of the first elastic element 64. At this time, the holding mechanism returns to Figure 3 , 5, 6, and finally, the coil 30 is energized again, so that the magnetic particle flaw detection device can be dragged along the surface of the pipeline 1 for mobile flaw detection.

[0048] In summary, the present invention improves the guide wheel 50 of the magnetic detector so that its wheel surface can protrude from the outer side of the end surface of the probe 40 or converge to the inner side of the end surface of the probe 40; when the wheel surface protrudes from the outer side of the end surface of the probe 40, the magnetic detector contacts the pipeline 1 through the guide wheel 50. At this time, the movement resistance of the magnetic detector is small, which is convenient for moving along the surface of the pipeline 1; and when the wheel surface converges to the inner side of the end surface of the probe 40, the magnetic detector contacts the pipeline 1 through the probe 40. The probe 40 and the pipeline 1 are tightly attracted together under the action of magnetic attraction, which can effectively prevent the magnetic detector from moving along the surface of the pipeline 1, so that the magnetic detector can still be maintained at a specific position of the pipeline 1 when it is out of hand, which is convenient for continuous magnetization of a specific area and reduces the labor intensity of the operator.

[0049] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

[0050] In the description herein, many specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of the specific details or with other devices, systems, components, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

Claims

1. A magnetic particle flaw detection device for pipeline inspection, characterized in that: include: Handheld base (10); A magnetic yoke (20) mounted on the handheld base (10), wherein the magnetic yoke (20) forms at least two legs (21) extending along a first direction; A coil (30) is wound around the magnetic yoke (20), and the coil (30) is electrically connected to a power supply module; A probe (40) is arranged in one-to-one correspondence with the supporting leg (21), and the probe (40) is hinged to the end of the supporting leg (21) through a pivot (41); A guide wheel (50), wherein the guide wheel (50) is rotatably arranged on a guide wheel bracket (51), and the guide wheel bracket (51) is movably connected to the probe (40), so that the wheel surface of the guide wheel (50) can protrude from the outer side of the end surface of the probe (40) or converge to the inner side of the end surface of the probe (40); the end surface of the probe (40) is the surface of the probe (40) used for contacting the workpiece to be measured; The guide wheel bracket (51) is hinged to the probe (40), and the guide wheel bracket (51) is limited to swing between a first angle and a second angle. When the guide wheel bracket (51) is located at the first angle, the wheel surface of the guide wheel (50) protrudes from the end surface of the probe (40), and when the guide wheel bracket (51) is located at the second angle, the wheel surface of the guide wheel (50) converges to the inner side of the end surface of the probe (40); It also includes a holding mechanism, which is configured to be switchable between a holding position and a releasing position. When located at the holding position, the holding mechanism holds the guide wheel bracket (51) at the first angle at the first angle. When located at the releasing position, the guide wheel bracket (51) at the first angle can be switched to the second angle under the action of an external force applied by the workpiece to be measured. The holding mechanism comprises a guide column (61), a stopper sleeve (62) and a stopper shoe (52); the guide column (61) is fixedly or rotatably arranged relative to the magnetic yoke (20) or the probe (40); the axial direction of the guide column (61) is parallel to the swing axis of the guide wheel bracket (51); the stopper sleeve (62) is slidably connected to the guide column (61) along the axial direction of the guide column (61) and switches between a first position and a second position along the axial direction of the guide column (61); the stopper shoe (52) is connected to the guide column (61) and ... The guide wheel bracket (51) is fixedly connected; when the holding mechanism is located at the holding position, the stop shoe (52) on the guide wheel bracket (51) located at the first angle abuts against the stop sleeve (62) located at the first position to prevent the guide wheel bracket (51) from swinging to the second angle; when the holding mechanism is located at the releasing position, the stop sleeve (62) located at the second position avoids the stop shoe (52) to enable the guide wheel bracket (51) to swing freely between the first angle and the second angle; Also included is a driving mechanism, the driving mechanism is used to drive the stop sleeve (62) to switch between the first position and the second position; The driving mechanism comprises a first elastic element (64) and a pull wire (63), wherein the first elastic element (64) is configured such that its elastic force can drive the stopper sleeve (62) to move from the second position to the first position, and one end of the pull wire (63) is connected to the stopper sleeve (62), and the other end is connected to a pressing handle (60) provided on the handheld base (10), so as to drive the stopper sleeve (62) to move from the first position to the second position; A second elastic element (53) is further provided between the guide wheel bracket (51) and the probe (40), and the second elastic element (53) is configured so that its elastic force can drive the guide wheel bracket (51) to swing from the second angle to the first angle.

2. The magnetic particle flaw detection device for pipeline inspection according to claim 1, characterized in that: The guide column (61) is coaxially arranged with the pivot shaft (41).

3. The magnetic particle flaw detection device for pipeline inspection according to claim 1, characterized in that: Two pairs of guide wheels (50) are correspondingly arranged for each probe (40), and the two pairs of guide wheels (50) are respectively mounted on two different guide wheel brackets (51), the two guide wheel brackets (51) are arranged in an open-closed manner, and the two guide wheel brackets (51) share the same retaining mechanism.

4. The magnetic particle flaw detection device for pipeline inspection according to claim 1, characterized in that: The legs (21) and the probes (40) are respectively provided with four, wherein the two legs (21) located at the front side are coaxial with the pivot (41) between the probes (40), and the retaining mechanisms corresponding to the two probes (40) share the same guide column (61); the two legs (21) located at the rear side are coaxial with the pivot (41) between the probes (40), and the retaining mechanisms corresponding to the two probes (40) share the same guide column (61).

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