Eddy current testing device for metal disc components and its usage method

Abstract

An eddy current detection device for metal disc components and its usage method disclosed by the present invention belong to the technical field of electromagnetic non-destructive testing. It includes a bottom suction cup, a fixed base, a rotating cylinder, a suction cup suction force adjustment component, a movable connecting rod, a probe fixing bracket, and a fixing screw. The rotating cylinder is rotatably connected to the fixed base, the bottom suction cup is arranged at the bottom of the fixed base and connected to the suction cup suction force adjustment component; one end of the movable connecting rod is hinged to the rotating cylinder; the probe fixing bracket is slidably installed on the movable connecting rod, and the probe fixing bracket is provided with a hole position for installing an eddy current detection probe, and the hole position is connected to the fixing screw. The present invention can reduce the complexity and detection cost of detection operations, realize rapid and stable identification of defect positions, and guide the identification and positioning of defects in metal disc components in actual industrial production.

Description

Technical Field

[0001] The present invention belongs to the technical field of electromagnetic nondestructive testing, and in particular relates to an eddy current testing device for metal disk-like components and a use method thereof. Background Art

[0002] Aircraft engine turbine disks, heat exchange tubes in power plants, etc. work under high temperature and high pressure, and are subjected to complex working loads. There is a serious stress concentration phenomenon, which is prone to oxidation, corrosion or cracking failure. With the further improvement of equipment safety and reliability requirements at home and abroad, it is extremely important to conduct regular inspection and evaluation of such metal disk components to ensure that there is no possibility of affecting its service life or causing failure on the outer surface and inside of the eddy current disk.

[0003] Eddy current testing is one of the most widely used technologies in non-destructive testing of metal disc-like structural parts. The typical testing method is to use a pen-type probe for manual testing, which is difficult to operate and inefficient. During the testing process, there are uncontrollable factors that make the defect signal submerged in the noise of the jitter lift-off, which is prone to missed detection and wrong detection. Adding a mechanical automation device to the probe can improve the detection efficiency and reduce the possibility of missed detection to a certain extent, but it will increase the detection cost and operation complexity, and it cannot be adaptively adjusted according to different models of eddy current disc components. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide an eddy current detection device for metal disk-like components and a method of using the same, which can reduce the complexity and cost of the detection operation, realize fast and stable identification of defect locations, and guide the identification and positioning of defects in metal disk-like components in actual industrial production.

[0005] The present invention is achieved through the following technical solutions:

[0006] The invention discloses an eddy current detection device for metal disk-like components, comprising a bottom suction cup, a fixed base, a rotating cylinder, a suction cup suction adjustment component, a movable connecting rod, a probe fixing frame and fixing screws;

[0007] The rotating cylinder is rotatably connected to the fixed base, the bottom suction cup is arranged at the bottom of the fixed base and connected to the suction cup suction adjustment component; one end of the movable connecting rod is hinged to the rotating cylinder; the probe fixing frame is slidably installed on the movable connecting rod, and the probe fixing frame is provided with a hole position for installing the eddy current detection probe, and the hole position is connected to the fixing screw.

[0008] Preferably, a bearing is provided between the rotating cylinder and the fixed base.

[0009] Preferably, the movable connecting rod is a square rod.

[0010] Preferably, a length scale is provided on the movable connecting rod.

[0011] Preferably, the movable connecting rod is hinged to the rotating cylinder through a spring hinge.

[0012] Preferably, an angle scale is engraved on the fixed base.

[0013] Preferably, the suction cup suction adjustment assembly includes a connecting rod and a toggle switch. One end of the connecting rod passes through the rotating cylinder and the fixed base and is connected to the middle of the bottom suction cup, and the other end is hinged to the toggle switch; when the toggle switch is toggled, the connecting rod drives the middle of the bottom suction cup to rise.

[0014] Preferably, the number of holes on the probe fixing bracket is 1 to 20, and the diameter of the holes is 2 to 50 mm.

[0015] Preferably, the diameter of the bottom suction cup is 10 to 200 mm, and the adjustable height is 0 to 50 mm; the height of the fixed base is 0 to 500 mm; the width of the movable connecting rod is 2 to 20 mm, and the length is 10 to 1000 mm; the diameter of the probe fixing bracket is 5 to 100 mm, and the height is 5 to 300 mm; the length of the fixing screw is 1 to 150 mm.

[0016] The usage method of the eddy current detection device for metal disc components disclosed by the present invention includes:

[0017] Install the eddy current detection probe in the hole of the probe fixing bracket and fix it with a fixing screw. Connect the eddy current detection probe to an external eddy current detection system and adjust the parameters of the eddy current detection system; fix the bottom suction cup on the metal disc component to be measured, adjust the position of the movable connecting rod, and start detection by using the rotating cylinder to move in a circle after it is stable. Keep it stable and uniform during the movement; after one week of detection, adjust the position of the probe fixing bracket on the movable connecting rod to perform the second circle of testing; repeat the above steps until the entire metal disc component is detected.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] An eddy current detection device for metal disc components disclosed by the present invention has a simple structure and reasonable design. It can be firmly fixed on the metal disc component through the bottom suction cup. By rotating the movable connecting rod, circumferential detection for one circle can be realized, with stable rotation and no noise generated by the jitter during manual detection, avoiding the masking of tiny defect signals by noise and having a high detection rate. The probe fixing bracket can adjust its position on the movable connecting rod to achieve coverage scanning of all positions of the metal disc component and is not prone to missed detection. The present invention can reduce the complexity of detection operations and detection costs, realize fast and stable identification of defect positions, and guide the identification and positioning of defects in metal disc components in actual industrial production.

[0020] Furthermore, a bearing is arranged between the rotating cylinder and the fixed base, so that the rotation is smooth and flexible.

[0021] Furthermore, the movable connecting rod is a square rod, the probe fixing frame will not produce relative rotation, and the structure is stable and reliable.

[0022] Furthermore, a length scale is provided on the movable connecting rod to facilitate adjustment of the position of the probe fixing frame and define the detection range.

[0023] Furthermore, the movable connecting rod is hinged to the rotating cylinder through a spring hinge, which can provide a buffer when there are undulations on the detection surface of the metal disk-like component, thereby avoiding damage to the probe.

[0024] Furthermore, the fixed base is engraved with an angle scale, which can indicate the angle of rotation detected.

[0025] Furthermore, the suction cup suction force adjustment component can drive the connecting rod to rise by flipping the switch, thereby driving the bottom suction cup to rise, so that the bottom suction cup can tightly absorb the metal disk-like parts to be tested.

[0026] Furthermore, the number of holes on the probe fixing frame is 1 to 20, and multiple probes can be installed according to actual needs.

[0027] The method for using the eddy current detection device for metal disk-like components disclosed in the present invention is easy to operate, efficient, and highly accurate, and is not dependent on personal experience and skill level. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a front view schematic diagram of the present invention;

[0030] Figure 3 It is a top view schematic diagram of the present invention;

[0031] Figure 4 It is a side view schematic diagram of the present invention;

[0032] Figure 5 It is a schematic diagram of the overall structure of the eddy current disk to be detected according to an embodiment of the present invention;

[0033] Figure 6 It is a front view schematic diagram of an eddy current disk to be detected according to an embodiment of the present invention;

[0034] Figure 7 A schematic top view of an eddy current disk as a detection object according to an embodiment of the present invention;

[0035] Figure 8 A schematic side view of an eddy current disk as a detection object according to an embodiment of the present invention;

[0036] Figure 9 Schematic diagram of the detection state of the present invention;

[0037] Figure 10 Signal characteristics when there is no defect;

[0038] Figure 11 Signal characteristics of defects.

[0039] In the figure: 1 is an eddy current detection device for metal disc components, 11 is a bottom suction cup, 12 is a fixed base, 13 is a rotating cylinder, 14 is a suction cup suction force adjustment component, 15 is a movable connecting rod, 16 is a probe fixing bracket, and 17 is a fixing screw; 2 is a metal disc part; 31 is a signal generator, 32 is a signal collector, 33 is a computer, and 34 is an eddy current detection probe. Specific implementation mode

[0040] The following further describes the present invention in detail with reference to the accompanying drawings. The content is an explanation of the present invention rather than a limitation:

[0041] As Figures 1 to 4 , the eddy current detection device for metal disc components of the present invention includes a bottom suction cup 11, a fixed base 12, a rotating cylinder 13, a suction cup suction force adjustment component 14, a movable connecting rod 15, a probe fixing bracket 16, and a fixing screw 17.

[0042] The rotating cylinder 13 is rotatably connected to the fixed base 12, and the bottom suction cup 11 is provided at the bottom of the fixed base 12 and connected to the suction cup suction force adjustment component 14; one end of the movable connecting rod 15 is hinged to the rotating cylinder 13; the probe fixing bracket 16 is slidably installed on the movable connecting rod 15, and the probe fixing bracket 16 is provided with a hole for installing the eddy current detection probe 34, and the hole is connected to the fixing screw 17.

[0043] In a preferred embodiment of the present invention, a bearing is provided between the rotating cylinder 13 and the fixed base 12.

[0044] In a preferred embodiment of the present invention, the movable connecting rod 15 is a square rod.

[0045] In a preferred embodiment of the present invention, the movable connecting rod 15 is provided with a length scale.

[0046] In a preferred embodiment of the present invention, the movable connecting rod 15 is hinged to the rotating cylinder 13 through a spring hinge.

[0047] In a preferred embodiment of the present invention, the fixed base 12 is engraved with an angle scale.

[0048] In a preferred embodiment of the present invention, the sucker suction force adjusting assembly 14 includes a connecting rod and a toggle switch. One end of the connecting rod passes through the rotating cylinder 13 and the fixed base 12 and is connected to the middle of the bottom sucker 11, and the other end is hinged to the toggle switch; when the toggle switch is toggled, the connecting rod drives the middle of the bottom sucker 11 to rise.

[0049] In a preferred embodiment of the present invention, the number of holes on the probe fixing bracket 16 is 1 to 20, and the diameter of the holes is 2 to 50 mm.

[0050] In a specific embodiment of the present invention, the diameter of the bottom sucker 11 is 10 to 200 mm, the adjustable height is 0 to 50 mm; the height of the fixed base 12 is 0 to 500 mm; the width of the movable connecting rod 15 is 2 to 20 mm, and the length is 10 to 1000 mm; the diameter of the probe fixing bracket 16 is 5 to 100 mm, and the height is 5 to 300 mm; the length of the fixing screw 17 is 1 to 150 mm.

[0051] The usage method of the above eddy current detection device for metal disc-like components:

[0052] As Figure 9 , install the eddy current detection probe 34 in the hole of the probe fixing bracket 16 and fix it with the fixing screw 17. The eddy current detection probe 34 is connected to an external eddy current detection system and the parameters of the eddy current detection system are adjusted; suck and fix the bottom sucker 11 on the metal disc-like part 2 to be measured, adjust the position of the movable connecting rod 15, and after it stabilizes, use the rotating cylinder 13 to move in a circle and start the detection, and keep it stable and uniform during the movement; after one week of detection, adjust the position of the probe fixing bracket 16 on the movable connecting rod 15 and perform the second circle of testing; repeat the above steps until the entire metal disc-like part 2 is detected.

[0053] During the detection process, the signal generator 31 emits a standard sine wave excitation signal with a certain frequency, the signal collector 32 collects the impedance signal and transmits it to the computer 33 for processing and display. The computer 33 analyzes the collected signal data to determine whether there are defects in the specimen and locates the defect position of the specimen.

[0054] Detection example

[0055] In this detection example, the metal disc-like part 2 to be measured is an eddy current disc, and its structure and main dimensions are as Figures 5 to 8 shown. There is a crack with a length of 8 mm, a width of 0.2 mm, and a depth of 0.3 mm at a position 5 mm away from the edge of the eddy current disc, as shown in Table 1:

[0056] Table 1

[0057]

[0058] The detection steps include:

[0059] 1. Fix the eddy current detection device 1 for metal disc components of the present invention on the eddy current disc, and select a pen-type probe to be fixed on the eddy current detection device 1 for metal disc components.

[0060] 2. Turn on the eddy current detection instrument, connect the pen-type probe to the instrument, set the excitation signal as a 500 kHz standard sine wave, and adjust the gain to 40 dB.

[0061] 3. Start collecting signals, slightly shake the pen-type probe. At this time, a lift-off signal appears on the screen. Adjust the phase to 131° to make the lift-off signal horizontal, and then clear the cache data.

[0062] 4. Adjust the position of the movable link 15 of the device. After it stabilizes, make a circular movement and start detection, and keep it stable and uniform during the movement.

[0063] 5. After one week of detection, adjust the position of the probe on the movable link 15 and conduct the next round of tests.

[0064] 6. Repeat the above steps until the entire eddy current disc is detected.

[0065] 7. The computer 33 collects the impedance signals of the receiving coil, transmits the impedance signals to the computer 33 for processing and display.

[0066] 8. As Figure 10 shown, it is the characteristic signal when there is no defect. Since the device of the present invention can effectively suppress jitter, the signal impedance diagram data is relatively stable. The X-axis signal is stable between 20 and 30, and the Y-axis signal is stable between -5 and 5.

[0067] 9. As Figure 11 shown, it is the characteristic signal when there is a defect, and the signal impedance diagram data can reach an amplitude of -90 and 35 on the X-axis and Y-axis.

[0068] 10. This device can quickly detect the defect information of the eddy current disc and identify the defect characteristics. Without affecting the ability to identify defects under the condition of effectively suppressing instability.

[0069] The above is only part of the embodiments of the present invention. Although some terms are used in the present invention, it does not exclude the possibility of using other terms. The use of these terms is only for the convenience of describing and explaining the essence of the present invention, and interpreting them as any additional limitation is contrary to the spirit of the present invention. The above is only further illustrated by examples to make the content of the present invention easier to understand, but it does not mean that the embodiments of the present invention are limited to this. Any technical extension or re-creation based on the present invention is protected by the present invention.

Claims

1. An eddy current testing device for metal disc components, characterized in that, It includes a bottom suction cup (11), a fixed base (12), a rotating cylinder (13), a suction cup suction force adjustment component (14), a movable connecting rod (15), a probe fixing bracket (16), and a fixing screw (17); The rotating cylinder (13) is rotatably connected to the fixed base (12). The bottom suction cup (11) is arranged at the bottom of the fixed base (12) and connected to the suction cup suction force adjustment component (14). One end of the movable connecting rod (15) is hinged to the rotating cylinder (13). The movable connecting rod (15) is a square rod. The probe fixing bracket (16) is slidably mounted on the movable connecting rod (15). The probe fixing bracket (16) is provided with hole positions for installing an eddy current detection probe (34). The hole positions are connected to the fixing screw (17). The number of hole positions on the probe fixing bracket (16) is 1 to 20, and the diameter of the hole positions is 2 to 50 mm; The suction cup suction force adjustment component (14) includes a connecting rod and a toggle switch. One end of the connecting rod passes through the rotating cylinder (13) and the fixed base (12) and is connected to the middle of the bottom suction cup (11), and the other end is hinged to the toggle switch. When the toggle switch is toggled, the connecting rod drives the middle of the bottom suction cup (11) to rise. The diameter of the bottom suction cup (11) is 10 to 200 mm, and the adjustable height is 0 to 50 mm. The height of the fixed base (12) is 0 to 500 mm. The width of the movable connecting rod (15) is 2 to 20 mm, and the length is 10 to 1000 mm. The diameter of the probe fixing bracket (16) is 5 to 100 mm, and the height is 5 to 300 mm. The length of the fixing screw (17) is 1 to 150 mm.

2. The eddy current testing device for metal disc-like components according to claim 1, characterized in that, A bearing is provided between the rotating cylinder (13) and the fixed base (12).

3. The eddy current testing device for metal disc components according to claim 1, wherein The movable connecting rod (15) is provided with a length scale.

4. The eddy current detection device for metal disc-like components according to claim 1, characterized in that, The movable connecting rod (15) is hinged to the rotating cylinder (13) through a spring hinge.

5. The eddy current testing device for metal disc components according to claim 1, wherein, The fixed base (12) is engraved with an angle scale.

6. The method of using the eddy current detection device for metal disc-like components according to any one of claims 1 to 5, characterized in that, It includes: Install the eddy current detection probe (34) in the hole positions of the probe fixing bracket (16) and fix it with the fixing screw (17). The eddy current detection probe (34) is connected to an external eddy current detection system and the parameters of the eddy current detection system are adjusted. Fix the bottom suction cup (11) on the metal disc-like part (2) to be measured, adjust the position of the movable connecting rod (15). After it is stable, use the rotating cylinder (13) to make a circular movement and start the detection, and keep it stable and uniform during the movement. After one week of detection, adjust the position of the probe fixing bracket (16) on the movable connecting rod (15) and conduct the second circle of testing. Repeat the above steps until the entire metal disc-like part (2) is detected.

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