Metal surface negative pressure type fitting eddy current detection device
By using a negative pressure bonding eddy current detection device, a micro-negative pressure bonding is formed between the negative pressure shell and the surface of the object being tested, which solves the problem of the difficulty of bonding the sensor with the detection surface and improves the sensitivity and accuracy of eddy current detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- EDDYSUN (XIAMEN) ELECTRONICS CO LTD
- Filing Date
- 2022-06-23
- Publication Date
- 2026-07-24
AI Technical Summary
In eddy current testing, the adhesion between the sensor and the surface of the object being tested is difficult, which affects the detection sensitivity and accuracy. This is especially true in complex structures such as aircraft engine blades, where changes in the sensor angle affect the detection results.
A negative pressure bonding eddy current detection device is adopted, which uses a negative pressure shell to form a micro-negative pressure bonding with the surface of the object being tested. The perpendicularity of the sensor is evaluated by the degree of negative pressure. Combined with pressure gauge and tactile feedback, the sensor is ensured to be perpendicular to the detection surface. A soft structure and coil-type eddy current detection sensor are used to improve bonding stability.
This achieves efficient bonding between the sensor and the detection surface, improving the sensitivity and accuracy of eddy current detection and reducing the impact of minute lift-offs and angle changes on the detection results.
Smart Images
Figure CN115096993B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of nondestructive testing technology, specifically to a metal surface bonding eddy current testing device and its testing method, and particularly to a metal surface negative pressure bonding eddy current testing device. Background Technology
[0002] In-service precision equipment frequently requires routine safety non-destructive testing to ensure its safety for future operations. For example, aircraft engine blades typically have multiple stages, complex structures with many layers, and are often concealed. To address in-situ flaw detection (generally using eddy current testing), precision auxiliary mechanisms or robotic arms are usually employed. However, even with these methods, ensuring good contact between the sensor and the surface of the component being inspected when the sensor is delivered to the inspection site is quite challenging. Ultrasonic testing is one option, but eddy current testing also suffers from a bias effect; even a slight change in probe angle can affect detection sensitivity. This is a major headache in in-situ flaw detection.
[0003] To address the above-mentioned shortcomings, the present invention adopts the following technical solution. Summary of the Invention
[0004] The purpose of this invention is to provide a negative pressure bonding eddy current detection device for metal surfaces, and the disclosed technical solution is as follows: A metal surface negative pressure bonding eddy current detection device is used for a surface bonding eddy current detection probe device (2) of the object to be detected (1), including an eddy current detection device (21) and a negative pressure device (22), characterized in that the negative pressure device (22) includes a negative pressure housing (221), and the eddy current detection device (21) includes an eddy current detection sensor (212) disposed on the negative pressure housing (221); The negative pressure housing (221) is a sealed cavity with an end opening (2210) near the surface of the object being tested. The eddy current detection sensor (212) is located at the end of the negative pressure housing (221) near the surface of the object being tested. During eddy current detection, the degree of sealing of the end opening (2210) against the surface of the object being tested is determined based on the degree of negative pressure formed inside the cavity of the negative pressure housing (221), thereby determining whether the eddy current detection probe device (2) is perpendicular to the detection surface of the object being tested. Because the end opening (2210) of the negative pressure housing (221) is set as a radially horizontal cross section, the horizontal plane fit can be used to determine the verticality of the negative pressure housing (221), i.e., the entire detection device.
[0005] The end opening (2210) of the negative pressure housing (221) is attached to the surface of the object being tested, serving as a basis for determining whether the eddy current detection device is perpendicular to the surface of the object being tested. For example, the degree of attachment between the end opening (2210) and the surface of the object being tested can be evaluated by airflow detection, or the degree of attachment between the end opening (2210) and the surface of the object being tested can be evaluated by the magnitude of the negative pressure suction force, thereby determining the verticality of the detection device. Because eddy current detection is sensitive to the lift-off value between the sensor and the detection surface, even a small lift-off effect or a small change in the angle of the detection probe may affect the sensitivity of the eddy current detection or cause errors in the accuracy of the detection value. Therefore, in this invention, a micro-negative pressure is formed between the negative pressure housing (221) and the surface of the object being tested to verify whether the eddy current detection probe is in a state perpendicular to the detection surface of the object being tested during the detection process.
[0006] Furthermore, the negative pressure device (22) also includes an air extraction device (222) for generating negative pressure.
[0007] Furthermore, the negative pressure device (22) also includes a pressure gauge for testing pressure values. Typically, negative pressure pneumatic devices are equipped with a pressure gauge, and the negative pressure condition inside the negative pressure housing (221) can be determined by the pressure value tested by the pressure gauge, thereby determining whether the detection device is perpendicular to the detection surface of the object being tested.
[0008] Furthermore, the negative pressure housing (221) is configured as a soft structure, which can be slightly deformed by the operator's hand to form a simple negative pressure. When the operator holds the eddy current detection probe device (2) and squeezes the negative pressure housing (221), the end opening (2210) fits against the surface of the object being tested, and a micro-negative pressure is formed in the inner cavity of the negative pressure housing (221), so that the detection device fits against the detection surface of the object being tested.
[0009] Furthermore, the eddy current detection sensor (212) is configured as a coil-type eddy current detection sensor including a coil (213), which is radially wound around the negative pressure housing (221) near the end opening (2210).
[0010] Furthermore, a thin annular first extension layer (2211a) is provided at the edge of the end opening (2210), and the coil (213) is provided on the side of the first extension layer (2211a) away from the detection surface of the object being tested. In a specific implementation, the first extension layer (2211a) is made of the same soft material as the negative pressure housing (221), such as a suction cup or vacuum hook, and is adsorbed onto the object being tested. In a preferred embodiment, it is designed as a vacuum micro-negative pressure according to the actual situation. The negative pressure is detected by a pressure gauge, or the operator can determine whether the detection device is perpendicular to the detection surface of the object being tested by sensing the deformation and adsorption force of the negative pressure housing (221) during the eddy current non-destructive testing operation.
[0011] Furthermore, the eddy current detection sensor (212) is configured as a coil-type eddy current detection sensor including a first coil (213a) and a second coil (213b). The second coil (213b) is radially wound around the negative pressure housing (221) near the end opening (2210), and the first coil (213a) is disposed on the side of the first extension layer (2211a) away from the detection surface of the object being detected.
[0012] Furthermore, a thin annular second extension layer (2211b) is provided at the edge of the end opening (2210). The second extension layer (2211b) and the first extension layer (2211a) form a stepped inner cavity. The first coil (213a) is disposed on the side of the first extension layer (2211a) away from the detection surface of the object being detected, and the second coil (213b) is disposed at the vertical end formed by the second extension layer (2211b). The stepped inner cavity formed by the second extension layer (2211b) and the first extension layer (2211a) not only increases the suction space, making the detection device more stable, but also increases the area of the detection coil layout.
[0013] Furthermore, a third coil (213c) is located on the side of the second extension layer (2211b) away from the detection surface of the object being detected. A fourth coil (213d) is also included on the negative pressure housing (221) near the second extension layer (2211b).
[0014] Furthermore, an array-type eddy current detection device is formed by combining multiple negative pressure housings (221) into an eddy current detection sensor. In one embodiment, a micro-vacuum is created by using the same air extraction device (222). In another embodiment, an airbag (4) is connected to the array-type eddy current detection device. When the eddy current detection device scans the object being detected, the airbag is squeezed to create a micro-negative pressure for close-fitting scanning and detection.
[0015] Based on the above technical solution, the present invention has the following beneficial effects: The present invention provides a metal surface negative pressure bonding eddy current detection device. The device employs an auxiliary air negative pressure device to form a micro-negative pressure adsorption structure in the housing of the detection device, ensuring that the eddy current sensor, when delivered to the detection location (such as the root of an engine blade), can adhere as closely as possible to the surface being detected. Furthermore, the negative pressure test value can be used to assess whether the probe is essentially perpendicular to the surface being detected. Typically, negative pressure pneumatic devices are equipped with a pressure gauge, which can assist in the judgment. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the detection device in use according to the preferred embodiment of the present invention; Figure 2 This is a cross-sectional schematic diagram of the detection device structure according to the preferred embodiment of the present invention; Figure 3 This is a schematic diagram of the detection device structure according to the preferred embodiment of the present invention; Figure 4 This is a schematic diagram of the detection device structure in another embodiment of the preferred embodiment of the present invention; Figure 5 This is a schematic diagram of the detection device structure in another embodiment of the preferred embodiment of the present invention; Figure 6 This is a schematic diagram of the detection device structure in another embodiment of the preferred embodiment of the present invention; Figure 7 This is a schematic diagram of the detection device structure in another embodiment of the preferred embodiment of the present invention; Figure 8 This is a schematic diagram of the detection device structure in another embodiment of the preferred embodiment of the present invention; Figure 9 This is a schematic diagram of the detection device structure in another embodiment of the preferred embodiment of the present invention; Figure 10 This is a schematic diagram of the detection device structure in another embodiment of the preferred embodiment of the present invention; Figure 11 This is a schematic diagram of the detection device structure in another embodiment of the preferred embodiment of the present invention; Figure 12 This is a schematic diagram of the detection device structure in another embodiment of the preferred embodiment of the present invention. Detailed Implementation
[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0018] like Figures 1 to 11As shown, a metal surface negative pressure bonding eddy current detection device is used for the surface bonding eddy current detection probe device 2 of the object being tested 1. It includes an eddy current detection device 21 and a negative pressure device 22. The negative pressure device 22 includes a negative pressure housing 221, and the eddy current detection device 21 includes an eddy current detection sensor 212 disposed on the negative pressure housing 221. like Figure 2 , 3 and Figure 4 As shown, the negative pressure housing 221 is a sealed cavity with an end opening 2210 near the surface of the object being tested. The eddy current detection sensor 212 is disposed at the end of the negative pressure housing 221 near the surface of the object being tested. During eddy current detection, the degree of sealing of the end opening 2210 against the surface of the object being tested is determined based on the degree of negative pressure formed inside the cavity of the negative pressure housing 221, thereby determining whether the eddy current detection probe device 2 is perpendicular to the detection surface of the object being tested. The end opening 2210 of the negative pressure housing 221 is attached to the surface of the object being tested, serving as a basis for determining whether the eddy current detection device is perpendicular to the surface of the object being tested. For example, the degree of attachment between the end opening 2210 and the surface of the object being tested can be evaluated by airflow detection, or the degree of attachment between the end opening 2210 and the surface of the object being tested can be evaluated by the magnitude of the negative pressure suction force, thereby determining the verticality of the detection device. Because eddy current detection is sensitive to the lift-off value between the sensor and the detection surface, even a small lift-off effect or a small change in the angle of the detection probe can affect the sensitivity of eddy current detection or cause errors in the accuracy of the detection value. Therefore, in this invention, a micro-negative pressure fit is formed between the negative pressure housing 221 and the surface of the object being tested to verify whether the eddy current detection probe is in a state perpendicular to the detection surface of the object being tested during the detection process.
[0019] like Figure 2 As shown, the negative pressure device 22 also includes an air extraction device 222 for creating negative pressure. The negative pressure device 22 also includes a pressure gauge for testing pressure values. Typically, negative pressure pneumatic devices are equipped with a pressure gauge, and the negative pressure condition inside the negative pressure housing 221 can be determined by the pressure value measured by the pressure gauge, thereby determining whether the detection device is perpendicular to the detection surface of the object being tested.
[0020] like Figure 3 As shown, in another embodiment, the negative pressure housing 221 is configured as a soft structure, which can be formed by the operator squeezing and compressing it slightly to create a simple negative pressure. When the operator holds the eddy current testing probe device 2 and squeezes the negative pressure housing 221, the end opening 2210 fits against the surface of the object being tested, and a micro-negative pressure is formed in the inner cavity of the negative pressure housing 221, so that the testing device fits against the testing surface of the object being tested.
[0021] like Figure 4 and Figure 5As shown, the eddy current detection sensor 212 is configured as a coil-type eddy current detection sensor including a coil 213, which is radially wound around the negative pressure housing 221 near the end opening 2210. Additionally, as... Figure 12 As shown, in a further embodiment, a magnetic core 5 is provided inside the negative pressure housing to improve the poor actual detection sensitivity. The added magnetic core 5 can greatly improve the detection sensitivity of the eddy current detection device.
[0022] like Figure 6 As shown, a thin annular first extension layer 2211a is provided at the edge of the end opening 2210, and the coil 213 is disposed on the side of the first extension layer 2211a away from the detection surface of the object being tested. In a specific implementation, the first extension layer 2211a is made of the same soft material as the negative pressure housing 221, such as a suction cup or vacuum hook, and is adsorbed onto the object being tested. In a preferred embodiment, it is designed as a vacuum micro-negative pressure according to the actual situation. The negative pressure is detected by a pressure gauge, or the operator can determine whether the detection device is perpendicular to the detection surface of the object being tested by sensing the deformation and adsorption force of the negative pressure housing 221 during the eddy current non-destructive testing operation.
[0023] like Figure 7 As shown, the eddy current detection sensor 212 is configured as a coil-type eddy current detection sensor including a first coil 213a and a second coil 213b. The second coil 213b is radially wound on the negative pressure housing 221 near the end opening 2210, and the first coil 213a is disposed on the side of the first extension layer 2211a away from the detection surface of the object being detected.
[0024] like Figure 8 and Figure 9 As shown, a thin annular second extension layer 2211b is provided at the edge of the end opening 2210. The second extension layer 2211b and the first extension layer 2211a form a stepped inner cavity. The first coil 213a is disposed on the side of the first extension layer 2211a away from the detection surface of the object being tested, and the second coil 213b is disposed at the vertical end formed by the second extension layer 2211b. The stepped inner cavity formed by the second extension layer 2211b and the first extension layer 2211a not only increases the suction space, making the detection device more stable, but also increases the area of the detection coil layout. A third coil 213c is disposed on the side of the second extension layer 2211b away from the detection surface of the object being tested. A fourth coil 213d is also included, disposed on the negative pressure housing 221 near the second extension layer 2211b.
[0025] like Figure 10 and Figure 11 As shown, an array-type eddy current detection device is formed by combining multiple negative pressure housings 221. Figure 10 One embodiment shown is a micro-vacuum created using the same vacuum pump 222; such as Figure 11 In another embodiment, an airbag 4 is connected to an array-type eddy current detection device. When the eddy current detection device scans the object being detected, it moves while squeezing the airbag to form a micro-negative pressure for close-fitting scanning and detection.
[0026] The above is one embodiment of the present invention. Furthermore, it should be noted that any equivalent or simple variations made to the structure, features, and principles described in this patent concept are included within the scope of protection of this patent.
Claims
1. A metal surface negative pressure bonding eddy current detection device, used for a surface bonding eddy current detection probe device (2) of an object (1) under test, comprising an eddy current detection device (21) and a negative pressure device (22), characterized in that... The negative pressure device (22) includes a negative pressure housing (221), and the eddy current detection device (21) includes an eddy current detection sensor (212) disposed on the negative pressure housing (221); The negative pressure housing (221) is a sealed cavity with an end opening (2210) at one end near the surface of the object being tested. The eddy current detection sensor (212) is located at the end of the negative pressure housing (221) near the surface of the object being tested. During the eddy current detection process, the degree of sealing of the end opening (2210) against the surface of the object being tested is determined according to the degree of negative pressure formed in the cavity inside the negative pressure housing (221), thereby determining whether the eddy current detection probe device (2) is perpendicular to the detection surface of the object being tested. The eddy current detection sensor (212) is configured as a coil-type eddy current detection sensor including a coil (213), wherein the coil (213) is radially wound around the negative pressure housing (221) near the end opening (2210); The edge of the end opening (2210) is provided with a thin annular first extension layer (2211a), and the coil (213) is provided on the side of the first extension layer (2211a) away from the detection surface of the object being detected.
2. The metal surface negative pressure bonding eddy current detection device according to claim 1, characterized in that... The negative pressure device (22) further includes an air extraction device (222) for generating negative pressure.
3. The metal surface negative pressure bonding eddy current detection device according to claim 2, characterized in that... The negative pressure device (22) also includes a pressure gauge for testing pressure values.
4. The metal surface negative pressure bonding eddy current detection device according to claim 1, characterized in that... The negative pressure shell (221) is configured as a soft structure, which can be formed by the hand of the tester through slight deformation to create a simple negative pressure.
5. The metal surface negative pressure bonding eddy current detection device according to claim 1, characterized in that... The eddy current detection sensor (212) is configured as a coil-type eddy current detection sensor including a first coil (213a) and a second coil (213b). The second coil (213b) is radially wound around the negative pressure housing (221) near the end opening (2210), and the first coil (213a) is disposed on the side of the first extension layer (2211a) away from the detection surface of the object being detected.
6. The metal surface negative pressure bonding eddy current detection device according to claim 5, characterized in that... The edge of the end opening (2210) is provided with a thin annular second extension layer (2211b), the second extension layer (2211b) and the first extension layer (2211a) form a stepped inner cavity, the first coil (213a) is disposed on the side of the first extension layer (2211a) away from the detection surface of the object being detected, and the second coil (213b) is disposed at the vertical end formed by the second extension layer (2211b).
7. A metal surface negative pressure bonding eddy current detection device according to claim 6, characterized in that... It also includes a third coil (213c) disposed on the side of the second extension layer (2211b) away from the detection surface of the object being detected.
8. A metal surface negative pressure bonding eddy current detection device according to any one of claims 1 to 7, characterized in that... An array-type eddy current detection device is formed by combining multiple negative pressure housings (221) to form an eddy current detection sensor.