Eddy current detection demonstration system

Abstract

The utility model provides an eddy current detection demonstration system, which comprises an alternating current power supply, a voltmeter, an exciting coil, a receiving coil and a flat plate test block, a plurality of defects are arranged on the flat plate test block, when the eddy current change is demonstrated, the exciting coil and the receiving coil both generate relative displacement with one defect and completely pass through the upper part of the defect, and the alternating current power supply is connected with the voltmeter. The alternating current power supply is electrically connected with the exciting coil, and the voltmeter is electrically connected with the receiving coil, so that when the eddy current change is demonstrated, the eddy current change at different depths can be visually displayed through the pointer swing of the voltmeter through the eddy current detection demonstration system; therefore, students can be helped to understand the eddy current detection principle more visually and deeply, the verification learning efficiency is greatly improved, and the students can understand and master related knowledge and application of the eddy current detection principle more visually and quickly.

Description

Technical Field

[0001] The utility model relates to the technical field of eddy current detection principle exploration experimental teaching demonstration equipment, in particular to an eddy current detection demonstration system. Background Art

[0002] Eddy current testing of aircraft components uses electromagnetic induction to generate eddy currents to inspect conductive materials. Specifically, eddy current testing technology can detect damage to critical parts such as the fuselage and engine, ensuring component quality and safety.

[0003] In the aircraft maintenance damage detection exploration learning teaching demonstration, due to the practical needs of the teaching that electromagnetic induction cannot be visualized and eddy current generation cannot be concretized, students are unable to intuitively learn and understand how eddy current detection is used for aircraft maintenance flaw detection. As a result, students are unable to quickly and intuitively grasp the principles of eddy current detection of damaged parts, which brings great difficulties to the teaching and learning work. Utility Model Content

[0004] In view of this, the utility model provides an eddy current detection demonstration system. By designing and manufacturing an eddy current detection demonstration device, the device can be used to demonstrate the visual relationship between eddy current changes and signal displays, so as to help students understand the eddy current detection principle more intuitively and deeply, greatly improving the efficiency of verification learning, and facilitating students to more intuitively and quickly understand and master the relevant knowledge and application of eddy current detection principles.

[0005] In order to solve the above technical problems, the utility model provides an eddy current detection demonstration system, including an AC power supply, a voltmeter, an excitation coil, a receiving coil and a flat test block, wherein several defects are provided on the flat test block, wherein, when demonstrating the eddy current changes, the excitation coil and the receiving coil are both relatively displaced with one of the defects and pass completely over it, the AC power supply is electrically connected to the excitation coil, and the voltmeter is electrically connected to the receiving coil. When demonstrating the eddy current changes, the utility model can realize the visual display of the eddy current changes at different depths through the pointer swing of the voltmeter through the eddy current detection demonstration system, so as to help students understand the eddy current detection principle more intuitively and deeply, greatly improve the efficiency of verification learning, and facilitate students to more intuitively and quickly understand and master the relevant knowledge and application of the eddy current detection principle.

[0006] The defects are linear defects, where several defects have the same length and width but different depths.

[0007] There are three defects on the flat test block: the first defect is 0.5mm deep, the second defect is 0.2mm deep, and the third defect is 1mm deep.

[0008] The flat test block is made of metal, such as any one of alloy steel plates, aluminum alloys or titanium alloys.

[0009] Both the excitation coil and the receiving coil are made of wound copper wire.

[0010] There are two voltmeters, two receiving coils, and the exciting coil is located between the two receiving coils.

[0011] In summary, compared with the prior art, this application has at least one of the following beneficial technical effects:

[0012] 1. The utility model can open defects of the same length and width but different depths on a flat test block, and use the electromagnetic induction phenomenon generated by the eddy current detection demonstration system to measure the change amplitude of the voltmeter pointer after the eddy current passes through the defect on the flat test block, so as to explore the eddy current detection operation of simulated aircraft and engines, so as to help students understand the principle of eddy current detection more intuitively and deeply, greatly improve the efficiency of verification learning, and facilitate students to understand and master the relevant knowledge and application of eddy current detection principle more intuitively and quickly, laying a solid foundation for subsequent detection of aircraft defects and faults.

[0013] 2. The utility model can explore the influence of defect width on eddy current by setting defects of the same length and width but different depths through the control variable method, and explore the relationship between eddy current and defect depth by the size of the pointer swing of the voltmeter, which is more intuitive.

[0014] 3. The utility model can set up two voltmeters and two receiving coils, and place the excitation coil between the two receiving coils to explore the eddy current changes of defects with longer lengths. By comparing the pointer swings of the two voltmeters, students can more clearly and intuitively master the method of eddy current defect detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of the eddy current detection demonstration system of the utility model.

[0016] Explanation of reference numerals: 100, AC power supply; 200, voltmeter; 300, exciting coil; 400, receiving coil; 500, flat test block; 501, defect. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiment of the present invention clearer, the following will be combined with the appended drawings of the embodiment of the present invention. Figure 1, clearly and completely describing the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of the present invention.

[0018] like Figure 1 As shown: This embodiment provides an eddy current detection demonstration system, including an AC power supply 100, a voltmeter 200, an excitation coil 300, a receiving coil 400 and a flat test block 500. A plurality of defects 501 are provided on the flat test block 500. When demonstrating the change of eddy current, the excitation coil 300 and the receiving coil 400 are relatively displaced with one of the defects 501 and pass completely over it. The specific operation is that the operator grasps the excitation coil 300 and the receiving coil 400 and passes along the length direction of the defect 501 from left to right in turn, and then observes The swing amplitude of the pointers on the two voltmeters 200, the AC power supply 100 is electrically connected to the excitation coil 300, and the voltmeter 200 is electrically connected to the receiving coil 400. When demonstrating eddy current changes, the utility model can use the eddy current detection demonstration system to realize the visual display of eddy current changes at different depths through the pointer swing amplitude of the voltmeter 200, so as to help students understand the eddy current detection principle more intuitively and deeply, greatly improve the efficiency of verification learning, and facilitate students to more intuitively and quickly understand and master the relevant knowledge and application of the eddy current detection principle.

[0019] According to one embodiment of the present invention, Figure 1 As shown, the defect 501 is a linear defect, wherein several defects 501 have the same length and width but different depths. There are three defects 501 on the flat test block 500, namely: the first defect 501 is 0.2 mm deep, the second defect 501 is 0.5 mm deep, and the third defect 501 is 1 mm deep. When the three defects 501 need to be tested, the experimenter first turns on the AC power supply 100, and then holds the excitation coil 300 and the receiving coil 400 and slides them from the left side to the right side above the defect 501 with a depth of 0.2 mm, observing the swing amplitude of the pointer on the voltmeter 200, sliding from the left side to the right side above the defect 501 with a depth of 0.5 mm, observing the swing amplitude of the pointer on the voltmeter 200, sliding from the left side to the right side above the defect 501 with a depth of 1 mm, observing the swing amplitude of the pointer on the voltmeter 200, and then the relationship between the eddy current change and the depth of the defect 501 can be obtained.

[0020] The flat test block 500 is made of metal, such as any one of alloy steel plates, aluminum alloy or titanium alloy. The purpose of this is to facilitate the observation of the relationship between the eddy current change and the depth of the defect 501 more vividly, intuitively and sensitively through the reading change of the voltmeter 200.

[0021] The excitation coil 300 and the receiving coil 400 are both made of wound copper wires.

[0022] There are two voltmeters 200, two receiving coils 400, and the excitation coil 300 is located between the two receiving coils 400. The utility model can set up two voltmeters 200 and two receiving coils 400, and by placing the excitation coil 300 between the two receiving coils 400, so as to explore the eddy current changes of the defect 501 with a longer length. By comparing the pointer swing of the two voltmeters 200, it is easier for students to master the method of eddy current detection of defects 501 in a clearer and more intuitive way.

[0023] According to another embodiment of the present invention, Figure 1 As shown, the voltmeter 200 may also be replaced by an ammeter.

[0024] The use method of this utility model:

[0025] First of all, it should be made clear that the eddy current detection demonstration system involved in the present invention is mainly used to demonstrate the visual relationship between eddy current changes and signal display by the amplitude of the pointer swing of the voltmeter 200 in the experiment of exploring the principle of eddy current detection for students, so as to deeply understand the principle of eddy current detection. The present invention uses the defects 501 of the same length and width but different depths opened on the flat test block 500 as an example to explain its usage in detail in conjunction with the eddy current detection demonstration system. When it is necessary to demonstrate eddy current changes, there are the following two solutions: First, place the excitation coil 300 and the receiving coil 400 on the flat test block 500, and then connect their ports to the voltage transformer and the AC power supply 100 respectively. In this case, the pointer of the voltmeter 200 swings greatly. Then the AC power supply 100 is started. At the same time, the experimenter holds the excitation coil 300 and the receiving coil 400 and slides them from the left side to the right side above the defect 501 with a depth of 0.2 mm in sequence, observing the swing amplitude of the pointer on the voltmeter 200. Then, the experimenter slides from the left side to the right side above the defect 501 with a depth of 0.5 mm and observes the swing amplitude of the pointer on the voltmeter 200. Then, the experimenter slides from the left side to the right side above the defect 501 with a depth of 1 mm and observes the swing amplitude of the pointer on the voltmeter 200. The relationship between the eddy current change and the depth of the defect 501 can be explored through the size of the pointer swing on the voltmeter 200, which is more vivid and intuitive.

[0026] Secondly, the excitation coil 300 and the receiving coil 400 are placed at an appropriate distance (for example, 2 mm) above the flat test block 500. In this case, the swing amplitude of the pointer of the voltmeter 200 is small. Then the AC power supply 100 is started. At the same time, the experimenter holds the excitation coil 300 and the receiving coil 400 and slides them from the left side to the right side above the defect 501 with a depth of 0.2 mm, observing the swing amplitude of the pointer on the voltmeter 200. Then, the experimenter slides from the left side to the right side above the defect 501 with a depth of 0.5 mm, observing the swing amplitude of the pointer on the voltmeter 200. Then, the experimenter slides from the left side to the right side above the defect 501 with a depth of 1 mm, observing the swing amplitude of the pointer on the voltmeter 200. Then, the relationship between the eddy current change and the depth of the defect 501 can be explored through the swing amplitude of the pointer on the voltmeter 200, which is more vivid and intuitive.

[0027] The utility model can design and manufacture an eddy current detection demonstration device, and use the device to demonstrate the visual relationship between eddy current changes and signal display, so as to help students understand the eddy current detection principle more intuitively and deeply, greatly improving the efficiency of verification learning, and facilitating students to more intuitively and quickly understand and master the relevant knowledge and application of eddy current detection principle.

[0028] Furthermore, it should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0029] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An eddy current detection demonstration system, characterized by: The device comprises an AC power supply (100), a voltmeter (200), an excitation coil (300), a receiving coil (400) and a flat test block (500). The flat test block (500) is provided with a plurality of defects (501). When demonstrating eddy current changes, the excitation coil (300) and the receiving coil (400) are relatively displaced with one of the defects (501) and pass completely over the defect. The AC power supply (100) and the excitation coil (300) are electrically connected together, and the voltmeter (200) and the receiving coil (400) are electrically connected together.

2. The eddy current detection demonstration system according to claim 1, characterized in that: The defects (501) are linear defects, wherein several of the defects (501) have the same length and width but different depths.

3. The eddy current detection demonstration system according to claim 1, characterized in that: There are three defects (501) on the flat test block (500), namely: the first defect (501) is 0.2 mm deep, the second defect (501) is 0.5 mm deep, and the third defect (501) is 1 mm deep.

4. The eddy current detection demonstration system according to claim 3, characterized in that: The flat test block (500) is made of metal.

5. The eddy current detection demonstration system according to claim 4, characterized in that: The excitation coil (300) and the receiving coil (400) are both made by winding copper wires.

6. The eddy current detection demonstration system according to claim 4, characterized in that: There are two voltmeters (200), two receiving coils (400), and the excitation coil (300) is located between the two receiving coils (400).

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