Fillet weld magnetic particle flaw detector

Abstract

The utility model relates to the technical field of fillet weld magnetic particle flaw detection instruments, and provides a fillet weld magnetic particle flaw detector which comprises a flaw detector body, at least two detection feet and a plurality of pulley assemblies, and the pulley assemblies are arranged on the detection feet in a one-to-one correspondence mode; the pulley assembly comprises a pulley seat hinged to the detection end and a plurality of pulley parts arranged on the pulley seat, the pulley parts are used for abutting against the detection piece, and a preset distance is reserved between a plane formed by the contact positions of the pulley parts and the detection piece and the detection end. The probe pin is integrally formed and is arranged on the flaw detector body, so that the magnetic field conduction resistance is low, and the sensitivity is high; and the pulley assembly is hinged to the detection end, so that when the detection pin detects the inner fillet weld, the detection pin pulley assembly can rotate according to the detected surface, and the distance between the end parts of the detection pin is not changed, so that the detection pin can slide on the detected surface without changing the original angle, and the effectiveness of the detection result is high.

Description

Technical Field

[0001] This application relates to the technical field of magnetic particle flaw detectors for fillet welds, and particularly to a magnetic particle flaw detector for fillet welds. Background Art

[0002] Magnetic particle flaw detection is one of the five conventional methods of non-destructive testing and is also a commonly used means for detecting surface or near-surface defects in ferromagnetic materials. Due to its high detection sensitivity and simple and reliable process, it is widely used. By utilizing the interaction between the leakage magnetic field at the workpiece defect and the magnetic particles, and taking advantage of the difference in magnetic permeability between the surface and near-surface defects (such as cracks, slag inclusions, hair cracks, etc.) of steel products and the magnetic permeability of steel, the position and shape of the defects are revealed under appropriate lighting conditions. By observing and interpreting the accumulation of these magnetic particles, magnetic particle flaw detection is achieved.

[0003] Fillet welds are common welds, and generally magnetic yoke type or rotating magnetic field type magnetic flaw detectors are used for detection. Currently, the commonly used rotating magnetic field flaw detector (as shown in Figure 1 ) has four straight feet, and sliding wheels are installed at the bottom of the feet. When the detection surface is a flat surface, the sliding wheels can play a good role, enabling the magnetic flaw detector to move flexibly back and forth under the magnetized state. However, for fillet welds, this straight-foot type rotating magnetic field flaw detector is not applicable. When detecting fillet welds with this straight-foot type rotating magnetic field flaw detector, the detected surface first contacts the pulleys on the feet, and the end of the foot is far from the detected surface, resulting in a significant reduction in detection sensitivity and being unable to effectively detect fillet welds.

[0004] Currently, an improved type of rotating magnetic field flaw detector has emerged (as shown in Figure 2 ). By hinging the end of the foot to the main body of the magnetic flaw detector, the end of the foot can be adjusted to be perpendicular to the corresponding detected surface, which can solve the defects of the conventional rotating magnetic field flaw detector. However, since the hinging of the end of the foot to the main body of the magnetic flaw detector increases the magnetic field conduction resistance, it will affect the detection sensitivity of the whole machine; and when detecting internal fillet welds, the opposite ends of the feet deviate from each other, resulting in the end of the foot being far from the weld, directly affecting the effectiveness of the detection result. Utility Model Content

[0005] In view of the above deficiencies of the prior art, the purpose of this application is to provide a magnetic particle flaw detector for fillet welds, aiming to solve the problem of poor effectiveness of the detection result when the existing rotating magnetic field flaw detector detects internal fillet welds.

[0006] The technical solution adopted by this application to solve the technical problem is as follows: A magnetic particle flaw detector for fillet welds, comprising: the main body of the flaw detector;

[0007] At least two probe feet, a plurality of the probe feet are arranged in the same direction, and a plurality of the probe feet are respectively arranged on the flaw detector body. One end of the probe foot facing away from the flaw detector body is the detection end;

[0008] A plurality of pulley assemblies, a plurality of the pulley assemblies are arranged in one-to-one correspondence with a plurality of the probe feet. The pulley assembly includes: a pulley seat, and the pulley seat is hinged on the detection end;

[0009] A plurality of pulley parts, a plurality of the pulley parts are respectively arranged on the pulley seat, and the detection end is located between a plurality of the pulley parts. The pulley parts are used to abut against the test piece and drive the detection end to move along the direction of the weld. A plane formed by the contact positions of a plurality of the pulley parts with the test piece is spaced apart from the detection end by a predetermined distance.

[0010] Further, the predetermined distance is 0.5 millimeters.

[0011] Further, the pulley seat is pivotally connected to the detection end, and the pivot axis of the pulley seat is arranged in the direction of the weld. The shape of the detection end in a cross-section perpendicular to the pivot axis is an arc with the pivot axis as the center.

[0012] Further, a plurality of the pulley parts are respectively arranged at both ends of the detection end, and a plurality of the pulley parts are all located in the direction perpendicular to the weld of the detection end.

[0013] Further, the plane of the pulley seat facing away from the detection end is parallel to the plane formed by the contact positions of a plurality of the pulley parts with the test piece.

[0014] Further, the fillet weld magnetic particle flaw detector further includes: two iron cores, the flaw detector body is connected between the two iron cores, there are four probe feet, the orientations of the four detection ends are the same, and the four probe feet are respectively arranged at both ends of the two iron cores.

[0015] Further, an electrical cavity is arranged in the flaw detector body, and a plurality of coils are arranged in the electrical cavity. A plurality of the coils are respectively wound around the two iron cores.

[0016] Further, the fillet weld magnetic particle flaw detector further includes: a power supply module, the power supply module is detachably connected to the surface of the flaw detector body facing away from the probe feet, and the power supply module is respectively electrically connected to a plurality of the coils.

[0017] Further, the fillet weld magnetic particle flaw detector further includes: a lighting lamp, and the lighting lamp is arranged on the surface of the flaw detector body facing the detection end;

[0018] An ultraviolet lamp, which is arranged on the surface of the flaw detector body facing the detection end.

[0019] Compared with the prior art, the probe feet of the present utility model are integrally formed and arranged on the flaw detector body, with low magnetic field conduction resistance and high sensitivity; and the pulley assembly is hinged on the detection end. When the probe feet detect the inner corner weld, the probe foot pulley assembly can rotate according to the detected surface, and the distance between the ends of the probe feet will not change, so that the probe feet can slide on the detected surface without changing the original angle, and the validity of the detection result is high. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 is the overall structural schematic diagram of a commonly used rotating magnetic field flaw detector;

[0022] Figure 2 is the overall structural schematic diagram of an improved rotating magnetic field flaw detector;

[0023] Figure 3 is the overall structural schematic diagram of the corner weld magnetic particle flaw detector provided in this embodiment from one perspective;

[0024] Figure 4 is the overall structural schematic diagram of the corner weld magnetic particle flaw detector provided in this embodiment from another perspective;

[0025] Figure 5 is the structural schematic diagram of a use state of the corner weld magnetic particle flaw detector provided in this embodiment;

[0026] Figure 6 is another structural schematic diagram of a use state of the corner weld magnetic particle flaw detector provided in this embodiment;

[0027] Figure 7 is still another structural schematic diagram of a use state of the corner weld magnetic particle flaw detector provided in this embodiment.

[0028] In the figure: 100, flaw detector body; 200, probe feet; 210, detection end; 300, pulley assembly; 310, pulley seat; 320, pulley part; 330, pivot shaft; 400, power module; 500, lighting lamp / ultraviolet lamp; 600, detected surface. Detailed Embodiments

[0029] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where 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 application and should not be construed as a limitation of the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0031] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0032] In addition, the technical features involved in different embodiments of the present invention described above can be combined with each other as long as they do not conflict with each other.

[0033] The present invention provides a Figures 3 to 7 fillet weld magnetic particle flaw detector as shown in

[0034] This fillet weld magnetic particle flaw detector mainly includes: a flaw detector body 100, at least two probe feet 200, and several pulley assemblies 300. The several probe feet 200 are arranged in the same direction and are respectively arranged on the flaw detector body 100. One end of the probe foot 200 facing away from the flaw detector body 100 is the detection end 210. The several pulley assemblies 300 are correspondingly arranged on the several probe feet 200. During actual use, the detection end 210 is oriented towards the surface to be detected 600 and approaches the surface to be detected 600 until the pulley assembly 300 contacts the surface to be detected 600. At this time, the detection end 210 can detect the contact with the surface to be detected 600.

[0035] The pulley assembly 300 includes: a pulley seat 310 and several pulley parts 320. The pulley seat 310 is hinged on the detection end 210. The several pulley parts 320 are respectively arranged on the pulley seat 310, and the detection end 210 is located between the several pulley parts 320. The pulley parts 320 are used to abut against the test piece and drive the detection end 210 to move along the direction of the weld.

[0036] Specifically, the pulley assembly 300 can rotate on the detection end 210 around a pivot axis 330 arranged in the direction towards the weld. The pulley assembly 300 can be adjusted according to the angle of the surface to be detected 600 so that the pulley assembly 300 is parallel and in contact with the surface to be detected 600. When detecting an internal angle weld, it is not necessary to adjust the angle of the probe foot 200 to make the pulley assembly 300 parallel and in contact with the surface to be detected 600. During actual use, since the pulley assembly 300 is in contact with the surface to be detected 600, the pulley assembly 300 can move along the direction of the weld for continuous detection.

[0037] The plane formed by the contact positions of the several pulley parts 320 and the test piece is spaced a predetermined distance from the detection end 210. When the several pulley parts 320 slide on the surface to be detected 600, the surface to be detected 600 will not rub against the detection end 210, extending the service life of the detection end 210.

[0038] As is well known, by using the interaction between the leakage magnetic field at the workpiece defect and the magnetic particles, and by taking advantage of the difference in magnetic permeability between the surface and near-surface defects (such as cracks, slag inclusions, hair cracks, etc.) of steel products and the magnetic permeability of steel, after magnetization, the magnetic field at these material discontinuities will be distorted, forming a partial magnetic flux leakage, and a leakage magnetic field is generated on the workpiece surface, thus attracting magnetic particles to form a magnetic particle accumulation at the defect. Under appropriate lighting conditions, the position and shape of the defect are revealed. By observing and interpreting the accumulation of these magnetic particles, magnetic particle flaw detection is achieved. Magnetic particle flaw detection is one of the five conventional non-destructive testing methods and is also a commonly used means to detect surface or near-surface defects of ferromagnetic materials. Due to its high detection sensitivity, simple and reliable process, it is widely used.

[0039] Magnetic particle flaw detectors are instruments used to inspect surface and near-surface defects of iron products, and are widely used in the manufacturing, installation, and use processes of pressure vessels (such as boilers, gas storage tanks, oil tanks, etc.), pressure pipelines (gas pipes, oil pipes, water pipes), ships, steel, machinery and equipment, aerospace, aviation, electric power, automobiles, motorcycles, petroleum, chemical industry, railways, bridges, elevators, amusement parks, etc. Fillet welds are common welds, and the magnetic flaw detectors for detecting pipe welds are generally yoke-type or rotating magnetic field-type magnetic flaw detectors.

[0040] The yoke-type magnetic flaw detector needs to perform cross-checking twice at one position, and there needs to be an overlapping area at each detection position, otherwise undetected flaws will occur. Therefore, the detection efficiency of the yoke-type magnetic flaw detector is low. Moreover, when the yoke-type magnetic flaw detector detects fillet welds, the probe feet 200 are very difficult to adapt to the two detected surfaces 600 with a certain angle. Even if the probe feet 200 are specially cut for fillet welds, poor contact between the probe feet 200 and the detected surface 600 will occur due to deviation between the clamping position and the design, resulting in false detection and undetected flaws, and the credibility of the detection results is low.

[0041] There are also rotating magnetic field-type magnetic flaw detectors used to detect fillet welds. It can detect defects in all directions at a certain position at one time and can be continuously detected by being pushed forward at a constant speed, with high detection efficiency. For the currently commonly used rotating magnetic field flaw detectors, the four probe feet 200 are straight feet, and sliding wheels are installed at the bottom of the probe feet 200. When the detection surface is a flat surface, the sliding wheels can play a good role, enabling the magnetic flaw detector to move flexibly back and forth under the magnetized state. However, for fillet welds, this straight-foot type of rotating magnetic field flaw detector is not applicable. When the straight-foot type of rotating magnetic field flaw detector detects fillet welds, the detected surface 600 first contacts the pulleys on the probe feet 200, and the end of the probe feet 200 is far from the detected surface 600, greatly reducing the detection sensitivity and making it impossible to effectively detect fillet welds, as Figure 1 shown in.

[0042] Currently, an improved type of rotating magnetic field flaw detector has emerged, as Figure 2 shown in. By hinging the end of the probe feet 200 to the magnetic flaw detector body, the end of the probe feet 200 can be adjusted to be perpendicular to the corresponding detected surface 600, which can solve the defects of conventional rotating magnetic field flaw detectors. However, since the hinging of the end of the probe feet 200 to the magnetic flaw detector body increases the magnetic field conduction resistance, it will affect the overall detection sensitivity; and when detecting internal fillet welds, the opposite ends of the probe feet 200 deviate from each other, resulting in the end of the probe feet 200 being far from the weld, directly affecting the effectiveness of the detection results.

[0043] The probe foot 200 of the present utility model is integrally formed and disposed on the flaw detector body 100, with low magnetic field conduction resistance and high sensitivity. Moreover, the pulley assembly 300 is hinged to the detection end 210. When the probe foot 200 detects the internal corner weld, the pulley assembly 300 of the probe foot 200 can rotate according to the detected surface 600, and the distance between the ends of the probe foot 200 will not change, enabling the probe foot 200 to slide on the detected surface 600 without changing the original angle, and the effectiveness of the detection result is high.

[0044] In some embodiments, as Figures 3 to 7 shown, the predetermined distance is 0.5 mm. During actual use, several pulley parts 320 are always 0.5 mm higher than the probe foot 200 from the detected surface 600, which can effectively reduce the friction between the probe foot 200 and the detected surface 600, and when the detected surface 600 is flat, it can ensure that the distance from the probe foot 200 to the detected surface 600 remains unchanged. In this way, the present magnetic particle flaw detector for corner welds is flexible to push, has high detection sensitivity, and can adapt to internal and external corner welds within the range of 80° to 180°.

[0045] In some embodiments, as Figure 3 、 Figures 5 to 7 shown, the pulley seat 310 is pivotally connected to the detection end 210, and the pivot axis 330 of the pulley seat 310 is arranged in the direction towards the weld. The shape of the cross-section of the detection end 210 perpendicular to the pivot axis 330 is an arc with the pivot axis 330 as the center.

[0046] Specifically, the pulley assembly 300 can rotate on the detection end 210 around the pivot axis 330 arranged in the direction towards the weld. Since the cross-sectional shape of the detection end 210 in the direction perpendicular to the weld is a circular arc with the pivot axis 330 as the center, when the pulley assembly 300 rotates relative to the detection end 210, the radial distance between the pulley assembly 300 and the detection end 210 is the same.

[0047] During actual use, the pulley assembly 300 can be adjusted according to the angle of the detected surface 600, and the pulley assembly 300 is in contact with the detected surface 600. Since the radial distance between the pulley assembly 300 and the detection end 210 is the same, when the pulley assembly 300 rotates within the range (under the condition that the radial distance between the pulley assembly 300 and the detection end 210 is the same), the distance between the detection end 210 and the detected surface 600 remains unchanged, thus greatly increasing the effectiveness of the detection result.

[0048] In some embodiments, as Figures 3 to 7As shown in , the plurality of pulley parts 320 are respectively arranged at both ends of the detection end 210, and the plurality of pulley parts 320 are all located in a direction perpendicular to the weld at the detection end 210. The movement directions of the plurality of pulley parts 320 are all toward the direction of the weld. With the above structure, the stability of the pulley assembly 300 when sliding on the detected surface 600 can be enhanced.

[0049] In some embodiments, Figures 3 to 7 As shown in FIG. 1 , a plane of the pulley seat 310 facing away from the detection end 210 is parallel to a plane formed by contact positions of the plurality of pulley portions 320 and the detection member.

[0050] In some embodiments, the corner weld magnetic particle flaw detector also includes: two iron cores (not shown in the figure), the flaw detector body 100 is connected between the two iron cores, four probe pins 200 are provided, the four detection ends 210 are oriented in the same direction, and the four probe pins 200 are respectively provided at the two ends of the two iron cores.

[0051] In some embodiments, an electrical cavity (not shown in the figure) is provided in the flaw detector body 100, and a plurality of coils (not shown in the figure) are provided in the electrical cavity, and the plurality of coils are respectively wound on two iron cores. The coil generates an alternating magnetic field under the drive of alternating current, and transmits the magnetic field to the surface to be detected 600 through the iron core, forming a rotating magnetic field on the surface to be detected 600 to detect the surface to be detected 600.

[0052] In some embodiments, Figures 3 to 7 As shown in the figure, the fillet weld magnetic particle flaw detector also includes: a power module 400, which is detachably connected to the surface of the flaw detector body 100 away from the probe foot 200, and the power module 400 is electrically connected to a plurality of coils respectively. It is convenient for wireless use, and the power supply can be replaced at any time to extend the use time.

[0053] In some embodiments, Figure 4 As shown in , the probe pins 200 are arranged at intervals on the flaw detector body 100 , and the fillet weld magnetic particle flaw detector further includes: an illumination lamp 500 and an ultraviolet lamp 500 .

[0054] The lighting lamp 500 and the ultraviolet lamp 500 are both arranged on the surface of the flaw detector body 100 facing the probe foot 200. When performing ordinary black magnetic powder testing, the lighting lamp should be used for easy observation; when performing fluorescent magnetic powder testing, the ultraviolet lamp should be used for easy observation.

[0055] In summary, a magnetic particle flaw detector for fillet welds is provided, which includes a flaw detector body, at least two detection feet, and a plurality of pulley assemblies. The plurality of pulley assemblies are correspondingly arranged on the plurality of detection feet; the pulley assembly includes a pulley seat hinged to the detection end and a plurality of pulley parts arranged on the pulley seat. The pulley parts are used to abut against the test piece, and the plane formed by the contact positions of the plurality of pulley parts and the test piece is spaced apart from the detection end by a predetermined distance. The detection feet of the present utility model are integrally formed and arranged on the flaw detector body, with low magnetic field conduction resistance and high sensitivity; and the pulley assembly of the pulley is hinged to the detection end. When the detection feet detect the internal fillet welds, the detection foot pulley assembly can rotate according to the detected surface, and the distance between the ends of the detection feet will not change, so that the detection feet can slide on the detected surface without changing the original angle, and the validity of the detection result is high.

[0056] Obviously, the above-mentioned embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present utility model.

Claims

1. A magnetic particle flaw detector for fillet welds, characterized in that, include: Flaw detector body; At least two probe feet, a plurality of the probe feet are arranged in the same direction, a plurality of the probe feet are respectively arranged on the flaw detector body, and an end of the probe foot away from the flaw detector body is a detection end; A plurality of pulley assemblies, wherein the plurality of pulley assemblies are arranged on the plurality of probe feet in a one-to-one correspondence, and the pulley assemblies include: a pulley seat, and the pulley seat is hinged on the detection end; A plurality of pulley parts are respectively arranged on the pulley seats, and the detection end is located between the plurality of pulley parts, the pulley parts are used to abut against the detection member and drive the detection end to move along the direction of the weld, and the plane formed by the contact positions of the plurality of pulley parts and the detection member is spaced a predetermined distance from the detection end.

2. The magnetic particle flaw detector for fillet welds according to claim 1, wherein The predetermined distance is 0.5 mm.

3. The magnetic particle flaw detector for fillet welds according to claim 1, wherein The pulley seat is pivotally connected to the detection end, and the pivot axis of the pulley seat is arranged in the direction of the weld. The shape of the cross section of the detection end perpendicular to the pivot axis is an arc with the pivot axis as the center.

4. The magnetic particle flaw detector for fillet welds according to claim 3, characterized in that A plurality of pulley parts are respectively arranged at two ends of the detection end, and a plurality of pulley parts are all located at the detection end in a direction perpendicular to the welding seam.

5. The magnetic particle flaw detector for fillet welds according to claim 4, characterized in that, The plane of the pulley seat facing away from the detection end is parallel to the plane formed by the contact positions of the plurality of pulley parts and the detection member.

6. The magnetic particle flaw detector for fillet welds according to any one of claims 1-5, characterized in that, The fillet weld magnetic particle flaw detector also includes: two iron cores, the flaw detector body is connected between the two iron cores, four probe pins are provided, the four detection ends are oriented in the same direction, and the four probe pins are respectively provided at the two ends of the two iron cores.

7. The magnetic particle flaw detector for fillet welds according to claim 6, characterized in that, An electrical cavity is arranged in the body of the flaw detector, and a plurality of coils are arranged in the electrical cavity. The plurality of coils are respectively wound on the two iron cores.

8. The magnetic particle flaw detector for fillet welds according to claim 7, wherein The fillet weld magnetic particle flaw detector further comprises: a power supply module, which is detachably connected to a surface of the flaw detector body facing away from the probe pin, and the power supply module is electrically connected to a plurality of the coils respectively.

9. The magnetic particle flaw detector for fillet welds according to claim 6, characterized in that, The fillet weld magnetic particle flaw detector further comprises: an illumination lamp, the illumination lamp being arranged on a surface of the flaw detector body facing the detection end; An ultraviolet lamp is arranged on the surface of the flaw detector body facing the detection end.

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