A magnetic energy-saving ring for rotating magnetic field flaw detector

Abstract

A magnetic energy-saving ring for a rotating magnetic field flaw detector, the magnetic energy-saving ring is installed at the lower part of the magnetic foot core, the magnetic energy-saving ring includes an internal hollow ring body, the hollow ring body of the magnetic energy-saving ring is clamped and fixed at the lower part of the magnetic foot core, and there is no hole on the magnetic foot core. The magnetic energy-saving ring of the present invention, on the one hand, no holes or through holes are opened on the magnetic foot core, no unnecessary magnetic leakage will be generated, and the magnetic lines of force will not be distorted and dispersed; on the other hand, two edges and corners of the four magnetic feet in the direction of travel are cut off to form a conical structure, so that the contact area between the magnetic pole and the inspected workpiece is appropriately reduced, which can make the magnetic force more concentrated and play a magnetic concentration role, thereby improving the lifting force and detection sensitivity of the equipment.

Description

Technical Field

[0001] The invention belongs to the field of industrial nondestructive testing, and in particular relates to a magnetic field concentrating energy-saving ring for a rotating magnetic field flaw detector. Background Art

[0002] Cross-yoke flaw detector (also known as rotating magnetic field flaw detector) is a flaw detection device that generates a rotating magnetic field by two yoke-shaped electromagnets crossing in space or plane at a certain angle and exciting them with two alternating currents of different phases. Therefore, cross-yoke flaw detector, also known as rotating magnetic field flaw detector, is a portable instrument commonly used in magnetic particle testing and belongs to the field of non-destructive testing.

[0003] The rotating magnetic field flaw detector can detect surface defects in all directions of the surface of the workpiece or equipment with one magnetization. It has high detection efficiency, light equipment, easy use, no electrical contact, and can detect coatings. It has been widely used in the inspection of large workpieces, butt welds, etc.

[0004] According to the magnetization specification, the rotating magnetic field flaw detector uses the continuous magnetization method during detection, that is, the magnetic powder or suspended magnetic fluid is applied to the workpiece while the external magnetic field is magnetized to perform magnetic powder detection. In order to improve the detection efficiency, it must be able to be easily pushed while magnetizing, and detect while moving. Of course, there are requirements for the relevant detection standards for the travel speed; on the other hand, when the rotating magnetic field flaw detector is magnetized, it has a large attraction force with the surface of the ferromagnetic material being inspected (NB / T47013.4-2015 "Non-destructive Testing of Pressure Equipment" standard requires a lifting force of ≥118N). In order to be able to move easily during magnetization, pulleys or bearings (hereinafter collectively referred to as rollers) are generally installed on the four magnetic feet.

[0005] At home and abroad, the existing installation method of the magnetic foot roller of the rotating magnetic field flaw detector is to install it by drilling holes on the magnetic foot, which has the following shortcomings:

[0006] 1. The holes on the magnetic feet are mostly through holes, which produce unnecessary magnetic leakage and cause the following unfavorable factors:

[0007] 1) Large magnetizing current

[0008] In order to achieve the lifting force and detection sensitivity required by the detection standard, the magnetizing current must be increased. If an external single-phase power supply is used, the impact is not very large; if a battery pack is used for power supply, especially for an integrated rotating magnetic field flaw detector, the impact cannot be ignored. Experiments have shown that the magnetizing current must be at least doubled when the roller is installed by opening a hole compared to without opening a hole!

[0009] 2) The battery life is greatly reduced

[0010] For battery-powered or integrated rotating magnetic field flaw detectors, the magnetizing current is large, and the use time of the battery pack after it is fully charged will be greatly reduced; if you want to increase the battery life of the battery pack, you must increase the capacity of the battery pack. Increasing the capacity of the battery pack not only consumes resources, but also increases the size and weight of the portable device, resulting in poor portability and heaviness, and increasing the physical labor of the inspection personnel.

[0011] 3) The equipment is overheating

[0012] Excessive magnetizing current will not only cause the coil to heat up, but more importantly, the control circuit components will heat up seriously, causing a series of problems such as unstable operation of the equipment.

[0013] 4) Seriously affects lifting force

[0014] The holes in the magnetic feet not only produce unnecessary magnetic leakage, but also cause the magnetic force to diverge. Figure 2 As shown, the lifting force of the equipment is reduced, thereby affecting the detection sensitivity.

[0015] 2. In traditional technology, the bottom of the magnetic foot is a plane with the same size as the cross section of the iron core, with a large area, which is not suitable for magnetic particle testing of concave and convex detection surfaces with large curvature.

[0016] 3. In the traditional technology, the magnetic feet have strong magnetism during the magnetization process and will absorb the magnetic powder in the magnetic suspension. Most rollers also have certain magnetism and will also absorb the magnetic powder. After a period of time, the rollers will be locked, making it difficult to move, increasing the physical labor of the inspectors and reducing the inspection efficiency.

[0017] In order to overcome the shortcomings of traditional technology, we invented a magnetic field energy-saving ring for rotating magnetic field flaw detectors, especially integrated rotating magnetic field flaw detectors. Summary of the invention

[0018] The invention provides a magnetic field concentrating energy-saving ring for a rotating magnetic field flaw detector to solve the problems existing in the prior art.

[0019] The present invention adopts the following technical solutions:

[0020] A magnetic energy-saving ring for a rotating magnetic field flaw detector, the magnetic energy-saving ring is installed at the lower part of a magnetic foot core, the magnetic energy-saving ring includes an internal hollow ring body, the hollow ring body of the magnetic energy-saving ring is clamped and fixed at the lower part of the magnetic foot core, and there is no hole on the magnetic foot core.

[0021] The ring body is formed by fixedly connecting at least two components.

[0022] The at least two ring body components are fixedly connected by a fixing piece and then clamped and fixed at the lower part of the magnetic foot core.

[0023] A walking device is installed outside the ring body.

[0024] The hollow part inside the ring body is consistent with the structure of the magnetic foot iron core of the rotating magnetic field flaw detector.

[0025] The ring body is made of non-conductor and non-magnetic material.

[0026] Beneficial effects of the present invention:

[0027] The magnetic energy-saving ring of the present invention, on the one hand, no holes or through holes are opened on the iron core of the magnetic feet, unnecessary magnetic leakage will not be generated, and the magnetic lines of force will not be distorted and dispersed; on the other hand, the two edges and corners of the four magnetic feet in the moving direction are cut off to form a conical structure, so that the contact area between the magnetic pole and the inspected workpiece is appropriately reduced, which can make the magnetic force more concentrated and play a magnetic gathering role, thereby improving the lifting force and detection sensitivity of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the installation of the magnetic field energy-saving ring of the present invention.

[0029] Figure 2 It is a schematic diagram of an embodiment of the magnetic field energy-saving ring of the present invention.

[0030] Figure 3 Schematic diagram of the present invention on different detection surfaces.

[0031] Figure 4 It is a schematic diagram of the lower part of the magnetic leg core of the present invention.

[0032] Among them, 1-magnetic foot core; 2-ring body, 21-first ring body assembly, 22-second ring body assembly, 23-fixing screws; 3-walking device. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] The present invention provides a magnetic field energy-saving ring for a rotating magnetic field flaw detector, which is installed at the lower part of a magnetic foot core 1. The magnetic field energy-saving ring includes an internal hollow ring body 2, and a walking device 3 is installed outside the ring body 2. The walking device is used to walk on the object to be measured. The hollow ring body of the magnetic field energy-saving ring can be clamped and fixed at the lower part of the magnetic foot core 1, and there is no through hole on the magnetic foot core.

[0040] Among them, the above-mentioned ring body is made of strong, bump-resistant, and aging-resistant non-conductive and non-magnetic materials. Since the magnetic energy-saving ring 2 is a non-conductive and non-magnetic material, it will not absorb the magnetic powder in the magnetic suspension, thereby preventing the walking device from locking and allowing the magnetic powder to move freely during detection, greatly reducing the physical labor of the detection personnel and improving the detection efficiency.

[0041] The options of the walking device include but are not limited to pulleys or bearings, and the pulley is rotatably mounted on the lower part of the outer side of the ring body.

[0042] The ring body is a ring body 2 formed by fixedly connecting at least two components, so that the ring body 2 can be conveniently spliced ​​and fixedly connected through fixing parts, and then clamped and fixed with the magnetic foot core 1.

[0043] like Figure 2 As shown, it is a structural diagram of the ring body 2 formed by the first component 21 and the second component 22. The fixing member between the two components is preferably a fastening screw 23. After the two components 22 are fixed by the fixing screws 23, the magnetic foot core 1 located in the ring body 2 can be clamped in the hollow of the ring body without punching holes for fixing the magnetic foot core 1. The fixing of the components by the fixing screws 23 facilitates subsequent installation, adjustment and replacement.

[0044] In some feasible implementations, the above-mentioned ring body may also be composed of more than two components, and the connection methods between the multiple components include but are not limited to screw connection, which all belong to the protection scope of the present invention and are not limited by the present invention. The outer shape and size of the ring body can be determined according to the overall appearance shape and size of the product, for example, it can be a rectangle as shown in the figure, or it can be a square, oval, round, streamlined or other shapes, and the present invention is not limited to them.

[0045] Furthermore, the shape of the hollow part inside the ring body includes but is not limited to a conical structure or a U-shaped structure that is wide at the top and narrow at the bottom. The present invention does not limit its shape. The lower part of the magnetic foot core has the same structure as the hollow part inside the ring body, which facilitates the cooperation and fixation of the two.

[0046] like Figure 3 As shown in FIG. 1 , an embodiment of a tapered structure having a tapered structure that is wide at the top and narrow at the bottom is shown. The tapered structure is preferably designed according to the actual inspection of workpieces or equipment with curvature, such as the inner and outer surface inspection of the girth weld of a pressure vessel or pressure pipe, such as Figure 3 -b and Figure 3 -c shows that the cone structure is not only suitable for detection Figure 3 -The large flat detection surface shown in a is also suitable for Figure 3 -b and Figure 3 -c shows a concave-convex detection surface, which can increase the contact area between the magnetic pole and the surface of the workpiece or equipment being inspected, ensure the convenience of the rotating magnetic field flaw detector, and increase the detection adaptability of the rotating magnetic field flaw detector equipment. It overcomes the disadvantage that traditional technology is not suitable for magnetic particle detection of concave-convex detection surfaces with large curvature.

[0047] When the present invention is used, after the multiple ring body components are preliminarily assembled, the space in the hollow part inside the ring body 2 is made larger than the shape of the lower part of the magnetic foot core, and then the preliminarily assembled ring body 2 is sleeved on the lower part of the magnetic foot core 1, and then the fixing screws 23 are tightened to clamp the ring body on the outside of the magnetic foot core 1 to prevent the ring body from falling off. After the assembly is completed, the magnetic field flaw detector can move and detect on the surface of the workpiece to be tested through the walking device 3 installed on the outside of the ring body 2.

[0048] The present invention has the following advantages:

[0049] 1. Magnetic field gathering function

[0050] The magnetic energy-saving ring structure of the present invention has the following advantages: on the one hand, no through holes are opened on the magnetic foot core, no unnecessary magnetic leakage is generated, and the magnetic lines of force are not distorted and dispersed; on the other hand, two edges and corners in the travel direction of the four magnetic feet are cut off to form a conical structure, so that the contact area between the magnetic pole and the workpiece to be inspected is appropriately reduced, such as Figure 4 As shown, the magnetic force can be more concentrated, playing a magnetic gathering role, thereby improving the lifting force and detection sensitivity of the equipment.

[0051] 2. The energy-saving effect is obvious, and the battery life is significantly improved.

[0052] Since the four magnetic cores do not need to have holes, unnecessary magnetic leakage will not be generated and the magnetic lines of force will not diverge, which reduces the magnetizing current and increases the battery life. Tests have confirmed that the battery life is increased by at least 100%, and the energy-saving effect is extremely obvious.

[0053] 3. It is not only suitable for the detection of large flat surfaces, but also suitable for magnetic particle detection of concave and convex detection surfaces with large curvature, overcoming the shortcomings of traditional technology.

[0054] 4. The magnetizing current is reduced, which reduces the heating of the coil and control circuit components, making the equipment more stable and reliable.

[0055] 5. No-load protection is more stable

[0056] With the reduction of magnetizing current, the no-load protection function of the rotating magnetic field flaw detector is more stable.

[0057] 6. The magnetic energy-saving ring uses 4 screws to fix the iron core, which prevents the silicon steel sheets from scattering due to bumps during use and plays a good protective role for the equipment.

[0058] 7. The magnetic energy-saving ring and roller are easy to install, adjust and replace.

[0059] 8. Anti-roll lock, the rotating magnetic field flaw detector moves freely.

[0060] The roller as the walking device is riveted on the magnetic energy-saving ring. The magnetic energy-saving ring is a non-conductive, non-magnetic material and will not absorb the magnetic powder in the magnetic suspension, thus preventing the roller from locking and making the magnetic powder inspection proceed smoothly, greatly reducing the physical labor of the inspectors and improving the inspection efficiency.

[0061] Therefore, the magnetic field energy-saving ring of the present invention has a simple structure, is easy to manufacture and process, has a significant magnetic field energy-saving effect, and has extremely high practical value.

[0062] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0063] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A magnetic energy-saving ring for a rotating magnetic field flaw detector, the magnetic energy-saving ring being installed at the lower part of the magnetic foot iron core, characterized in that: The magnetic energy-saving ring includes a hollow ring body inside. The hollow ring body of the magnetic energy-saving ring is clamped and fixed on the lower part of the magnetic foot core, and there is no hole on the magnetic foot core. The hollow part inside the ring body is a conical structure that is wide at the top and narrow at the bottom. The hollow part inside the ring body is consistent with the structure of the magnetic foot core of a rotating magnetic field flaw detector. A walking device is installed on the outside of the ring body, and the ring body is made of non-conductive and non-magnetic material.

2. The magnetic energy-saving ring for a rotating magnetic field flaw detector according to claim 1, characterized in that: The ring body is formed by fixedly connecting at least two components.

3. The magnetic energy-saving ring for a rotating magnetic field flaw detector according to claim 2 is characterized in that: The at least two components are fixedly connected by a fixing piece and then clamped and fixed at the lower part of the magnetic foot core.

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