Ultrasonic testing device and method for large-curvature cermet composite brazing layer

Abstract

The application belongs to the technical field of ultrasonic detection equipment, in particular to a large-curvature metal ceramic composite brazing layer ultrasonic detection device and detection method, which comprises a probe body, the probe body is used for transmitting and receiving ultrasonic signals; further comprising a coupling mechanism, the coupling mechanism is used for enhancing the coupling effect of the probe body and the surface of the object to be detected; the application sets the coupling mechanism, uses the limiting cover with elastic deformation capacity to surround and block the gap between the probe body and the object to be detected, thereby constructing the coupling chamber which moves synchronously with the probe body, and continuously conveying the coupling liquid through the pressure stabilizing pipe, so that the coupling liquid always fills the coupling chamber, thereby optimizing the ultrasonic detection effect; meanwhile, the concentric distribution of the coupling chamber and the intercepting chamber makes the coupling liquid leak, and cooperates with the negative pressure pipe and the adsorption sponge to realize the interception of the coupling liquid, thereby solidifying the flow path of the coupling liquid, and further enhancing the convenience of detecting the object to be detected.

Description

Technical Field

[0001] This invention belongs to the field of ultrasonic detection equipment technology, specifically an ultrasonic testing device and method for large curvature metal-ceramic composite brazing layers. Background Technology

[0002] The demand for connecting small-diameter ceramic pipes to metal pipes in current industrial production is increasing. This connection method often employs brazing technology. Due to the composite structure involving three different materials (ceramic, metal pipe, and lead as welding material) and the thinness of the weld layer, ensuring weld quality is challenging. This is especially critical in special operating conditions such as high-curvature metal-ceramic composite pipes, where weld quality inspection becomes even more critical.

[0003] Among conventional technologies, ultrasonic testing is one of the most widely used techniques for inspecting weld layers. However, it still has significant limitations for inspecting brazed layers of metal-ceramic composites with large curvature: First, conventional planar ultrasonic probes are difficult to fit tightly against surfaces with large curvature, resulting in poor coupling and unstable ultrasonic incident angles, which affects the accuracy of the detection signal. Second, traditional testing often relies on manual operation, and for weld layers with annular or complex curvature, it is difficult to ensure the consistency of the detection path, which can easily lead to missed or false detections. Moreover, the detection efficiency cannot meet the needs of industrial mass production.

[0004] In order to enhance the coupling effect between the ultrasonic probe and the area to be tested, a helicopter rotor blade leading edge high curvature ultrasonic detection probe and its usage method were disclosed in the related technology (application number CN202311570404X). This technology enhances the ultrasonic detection effect by adding a water film containing liquid and filling the ultrasonic probe and the surface of the object to be tested with the water film. However, in the actual application, it was found that, on the one hand, the water film itself has poor extensibility and fluidity, so the filling effect of the gap is poor. On the other hand, in the process of ultrasonic wave transmission, it is necessary to penetrate not only the liquid but also the water film before finally transmitting to the object to be tested. Therefore, the ultrasonic wave reflection interference is too strong, which is not conducive to the accurate identification of ultrasonic detection.

[0005] In view of this, the present invention proposes an ultrasonic testing device and method for large curvature metal-ceramic composite brazing layers to solve the above-mentioned technical problems. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies and solve the aforementioned technical problems, this invention proposes an ultrasonic testing device and method for large curvature metal-ceramic composite brazing layers.

[0007] The technical solution adopted by the present invention to solve its technical problem is: the ultrasonic testing device for large curvature metal-ceramic composite brazing layer of the present invention includes a probe body, which is used to transmit and receive ultrasonic signals;

[0008] It also includes a coupling mechanism, which is mounted on the probe body and is used to enhance the coupling effect between the probe body and the surface of the object to be measured;

[0009] The coupling mechanism includes a confinement cover, a coupling fluid, and a pressure stabilizing tube;

[0010] The limiting cover is fixedly mounted on the probe body. The limiting cover is conical, with the conical opening facing the surface of the object to be measured. The side of the limiting cover facing the surface of the object to be measured is made of an elastic material.

[0011] The probe body, the center of the confinement cover, and the surface of the object to be measured form a coupling chamber, which is filled with a coupling fluid.

[0012] The pressure stabilizing pipe is connected to the coupling chamber via a pipeline. The pressure stabilizing pipe is used to deliver coupling fluid into the coupling chamber and to maintain the pressure of the coupling fluid in the coupling chamber.

[0013] Preferably, the limiting cover is composed of a connecting ring and multiple conical covers stacked together. The connecting ring is fixedly installed on the probe body, and multiple conical covers are fixedly installed on the connecting ring. The diameter of the multiple conical covers increases sequentially from the inside to the outside, and the opening ends of the multiple conical covers are all in contact with the surface of the object to be measured.

[0014] Preferably, the plurality of conical shrouds form an interception chamber, and an adsorption sponge is fixedly installed in the interception chamber. The adsorption sponge is used to adsorb and fix the coupling liquid flowing out of the coupling chamber.

[0015] Preferably, a negative pressure pipe is fixedly installed in the interception chamber, the negative pressure pipe extends into the interior of the adsorption sponge, and the negative pressure pipe has an opening inside the adsorption sponge.

[0016] Preferably, it also includes an automatic detection mechanism, the probe body is mounted on the automatic detection mechanism, and the automatic detection mechanism is used to drive the relative movement between the probe body and the object to be tested;

[0017] The automatic detection mechanism includes a detection frame, an axial motion plate, a connecting frame, a detection ring, and a clamping plate;

[0018] The testing frame is a frame structure, and a drive motor is rotatably mounted on the testing frame. A screw is fixedly mounted on the output end of the drive motor.

[0019] An axial motion plate is slidably mounted on the detection frame, and the axial motion plate is driven by a screw.

[0020] A connecting frame is slidably mounted on the axial motion plate, and a detection ring is fixedly mounted on the end of the connecting frame away from the axial motion plate. The probe body is fixedly mounted on the detection ring at equal intervals.

[0021] The testing frame is rotatably mounted with symmetrically arranged electric telescopic rods. The output end of the electric telescopic rod is equipped with a clamping plate. The object to be tested is clamped and installed between the symmetrical clamping plates. The electric telescopic rod and the screw are connected by a belt drive.

[0022] Preferably, a circulation chamber is installed on the axial motion plate, and the circulation chamber has a circulation cavity and a diaphragm cavity that are interconnected. An elastic diaphragm is fixedly installed in the diaphragm cavity. The negative pressure pipe and the pressure stabilizing pipe both extend into the diaphragm cavity, and the negative pressure pipe and the pressure stabilizing pipe are located on both sides of the elastic diaphragm. The negative pressure pipe and the pressure stabilizing pipe are both unidirectional pipes. A cam is rotatably installed in the diaphragm cavity. A transmission wheel is rotatably installed on the axial motion plate. The transmission wheel is connected to the detection frame by friction transmission. The transmission wheel and the cam are connected by a transmission belt.

[0023] Preferably, a filter element is fixedly installed inside the circulation chamber, the circulation chamber and the diaphragm chamber are connected by dual channels, and the filter element is located between the dual channels.

[0024] Preferably, the detection ring is located above the axial connecting plate, the opening of the limiting cover faces upward, and the connecting frame is a telescopic structure.

[0025] Preferably, the probe body and the detection ring are connected by a universal coupling, and the probe body is fixedly mounted with evenly distributed support springs in the circumferential direction.

[0026] An ultrasonic testing method for brazing layers of metal-ceramic composites with large curvature, the method comprising the following steps:

[0027] S1: The control program drives the symmetrical electric telescopic rods to move relative to each other, clamping the object to be measured between the clamping plates, and simultaneously starts the drive motor to drive the screw and electric telescopic rod to rotate;

[0028] S2: During the linear motion of the probe body driven by the axial motion plate, the object under test rotates at a constant speed, causing the probe body to contact the surface of the object under test through the limiting cover.

[0029] S3: During the movement of the axial motion plate, the cam pushes the elastic diaphragm to move. With the cooperation of the negative pressure pipe and the pressure stabilizing pipe, the coupling fluid fills the coupling chamber and circulates in the coupling chamber and the circulation chamber.

[0030] S4: The probe body emits ultrasonic waves, which, with the cooperation of the coupling mechanism, are transmitted to the object under test. The reflected echoes are collected and analyzed to achieve comprehensive detection and evaluation of welding quality.

[0031] The beneficial effects of this invention are as follows:

[0032] 1. The ultrasonic testing device and method for large curvature metal-ceramic composite brazed layers of the present invention, by setting up a coupling mechanism, uses a limiting cover with elastic deformation capability to surround and seal the gap between the probe body and the object to be tested, thereby constructing a coupling chamber that moves synchronously with the probe body. The coupling fluid is continuously delivered through a pressure stabilizing pipe, so that the coupling fluid is always full of the coupling chamber to optimize the ultrasonic testing effect. At the same time, the concentric distribution of the coupling chamber and the interception chamber allows the coupling fluid to be intercepted when it leaks out, in conjunction with the negative pressure pipe and the adsorption sponge, thereby solidifying the flow path of the coupling fluid and enhancing the convenience of testing the object to be tested.

[0033] 2. The ultrasonic testing device and method for large curvature metal-ceramic composite brazed layers described in this invention, by setting up a screw, belt, and electric telescopic rod, under the drive of the same drive motor, causes the rotational motion of the object under test to be correlated with the linear motion of the probe body, making the detection path of the probe body on the object under test controllable. With the help of a pre-set control program, it is easy to cover the surface of the object under test with the detection path, thereby reducing the probability of detection omissions. At the same time, the automated detection method can also effectively reduce the labor intensity of the staff and enhance the convenience of ultrasonic testing. Attached Figure Description

[0034] The invention will now be further described with reference to the accompanying drawings.

[0035] Figure 1 This is a perspective view of the present invention;

[0036] Figure 2 This is a perspective view of the invention from another angle;

[0037] Figure 3 It is a three-dimensional view of the assembly of the axial motion plate and the detection ring;

[0038] Figure 4 This is a diagram of the internal structure of the circulating storage tank;

[0039] Figure 5 It is a three-dimensional view of the assembly of the detection ring and the limiting cover;

[0040] Figure 6 It is a three-dimensional view showing the separation of the confinement cover and the probe body;

[0041] Figure 7 This is a cross-sectional view of the enclosure;

[0042] Figure 8 This is a flowchart of the method of the present invention;

[0043] In the diagram: 1. Probe body; 2. Connecting ring; 21. Conical cover; 22. Coupling chamber; 23. Voltage stabilizing tube; 24. Interception chamber; 25. Absorbent sponge; 26. Negative pressure tube; 3. Detection frame; 31. Drive motor; 32. Screw; 33. Axial motion plate; 34. Connecting frame; 35. Detection ring; 36. Electric telescopic rod; 37. Clamping plate; 38. Belt; 4. Circulation chamber; 41. Circulation cavity; 42. Diaphragm cavity; 43. Elastic diaphragm; 44. Filter element; 5. Cam; 51. Transmission wheel; 52. Transmission belt; 6. Universal coupling; 61. Support spring. Detailed Implementation

[0044] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0045] like Figures 1 to 8 As shown, the ultrasonic testing device for a large curvature metal-ceramic composite brazing layer of the present invention includes a probe body 1, which is used to transmit and receive ultrasonic signals.

[0046] It also includes a coupling mechanism, which is mounted on the probe body 1 and is used to enhance the coupling effect between the probe body 1 and the surface of the object to be measured;

[0047] The coupling mechanism includes a confinement cover, a coupling fluid, and a pressure stabilizing tube 23;

[0048] The limiting cover is fixedly installed on the probe body 1. The limiting cover is cone-shaped, and the cone-shaped opening of the limiting cover faces the surface of the object to be measured. The side of the limiting cover facing the surface of the object to be measured is made of elastic material.

[0049] The probe body 1, the center of the confinement cover and the surface of the object to be measured form a coupling chamber 22, which is filled with coupling fluid.

[0050] The pressure stabilizing pipe 23 is connected to the coupling chamber 22 via a pipe. The pressure stabilizing pipe 23 is used to deliver coupling fluid into the coupling chamber 22 and to maintain the pressure of the coupling fluid in the coupling chamber 22.

[0051] The limiting cover is composed of a connecting ring 2 and multiple conical covers 21 stacked together. The connecting ring 2 is fixedly installed on the probe body 1, and multiple conical covers 21 are fixedly installed on the connecting ring 2. The diameter of the multiple conical covers 21 increases sequentially from the inside to the outside, and the opening ends of the multiple conical covers 21 are all in contact with the surface of the object to be measured.

[0052] The multiple conical covers 21 form an interception chamber 24, and an adsorption sponge 25 is fixedly installed in the interception chamber 24. The adsorption sponge 25 is used to fix the coupling fluid flowing out of the coupling chamber 22.

[0053] A negative pressure pipe 26 is fixedly installed inside the interception chamber 24. The negative pressure pipe 26 extends into the interior of the adsorption sponge 25, and the negative pressure pipe 26 has an opening inside the adsorption sponge 25.

[0054] In order to optimize the transmission effect of ultrasonic waves emitted by the probe body 1 into the object under test during ultrasonic testing, a coupling mechanism is provided in this invention. A closed coupling chamber 22 is constructed between the probe body 1 and the object under test, and a coupling fluid is filled in the coupling chamber 22 to optimize the transmission effect of ultrasonic waves.

[0055] Specifically, in this invention, the coupling mechanism is mounted on the probe body 1. When detecting a large-curvature object, the curvature of the object causes the gap between the probe body 1 and the object to vary as the probe body 1 moves across it. Therefore, in this invention, a limiting cover is installed on the probe body 1. During the detection process, the side of the probe body 1 with the limiting cover is pressed against the object. Under the pressure, the limiting cover elastically deforms, fully conforming to the surface of the object. The limiting cover seals the gap between the probe body 1 and the object, forming a coupling chamber 22. The cover moves with the probe body 1, and the coupling chamber 22 is always closed to the outside. At the same time, the coupling fluid continuously delivered by the pressure stabilizing tube 23 ensures that the coupling chamber 22 is always full of coupling fluid. The coupling fluid fills the gap between the probe body 1 and the object to be measured, thereby optimizing the transmission effect of ultrasound. Since the coupling chamber 22 is located inside multiple interception chambers 24, when the coupling fluid in the coupling chamber 22 flows out, the adsorption sponge 25 and the negative pressure tube 26 installed in the interception chamber 24 collect the leaked coupling fluid, so as to facilitate the recycling and reuse of the coupling fluid.

[0056] This invention utilizes a coupling mechanism with an elastically deformable limiting cover to surround and seal the gap between the probe body 1 and the object under test, thereby constructing a coupling chamber 22 that moves synchronously with the probe body 1. A coupling fluid is continuously supplied through a pressure stabilizing pipe 23, ensuring that the coupling fluid always fills the coupling chamber 22, thus optimizing the ultrasonic detection effect. Simultaneously, the concentric distribution of the coupling chamber 22 and the interception chamber 24 allows for the interception of the coupling fluid when it leaks, in conjunction with a negative pressure pipe 26 and an absorbent sponge 25. This solidifies the flow path of the coupling fluid, thereby enhancing the convenience of detecting the object under test.

[0057] As a preferred embodiment of the present invention, it further includes an automatic detection mechanism, wherein the probe body 1 is mounted on the automatic detection mechanism, and the automatic detection mechanism is used to drive the relative movement between the probe body 1 and the object to be tested;

[0058] The automatic detection mechanism includes a detection frame 3, an axial motion plate 33, a connecting frame 34, a detection ring 35, and a clamping plate 37;

[0059] The detection frame 3 is a frame structure, and a drive motor 31 is rotatably mounted on the detection frame 3. A screw 32 is fixedly mounted on the output end of the drive motor 31.

[0060] An axial motion plate 33 is slidably mounted on the detection frame 3, and the axial motion plate 33 is driven by a screw 32.

[0061] A connecting frame 34 is slidably mounted on the axial motion plate 33. A detection ring 35 is fixedly mounted on the end of the connecting frame 34 away from the axial motion plate 33. The probe body 1 is fixedly mounted on the detection ring 35 at equal intervals. In this invention, the detection ring 35 and the connecting frame 34 are detachably fixedly connected. The detection ring 35 has multiple sizes so that the appropriate detection ring 35 can be replaced when detecting objects of different diameters.

[0062] The testing frame 3 is rotatably mounted with symmetrically arranged electric telescopic rods 36. The output end of the electric telescopic rod 36 is equipped with a clamping plate 37. The object to be tested is clamped and installed between the symmetrical clamping plates 37. The electric telescopic rod 36 and the screw 32 are connected by belt drive through belt 38.

[0063] The detection ring 35 is located above the axial connecting plate, the opening of the limiting cover faces upward, and the connecting frame 34 is a telescopic structure. The upward setting of the limiting cover opening allows the interception chamber 24 distributed outside the coupling chamber 22 to collect the leaked coupling fluid under the cooperation of gravity, even if it is connected to the outside, thus reducing the probability of coupling fluid polluting the environment.

[0064] The probe body 1 and the detection ring 35 are connected by a universal coupling 6. The probe body 1 is fixedly installed with evenly distributed support springs 61 in the circumferential direction. The presence of the universal coupling 6 and the support springs 61 can push the probe body 1 to always stick to the surface of the object under test during the relative movement between the probe body 1 and the object under test, thereby reducing the probability of the coupling chamber 22 being connected to the outside world.

[0065] To reduce detection omissions caused by manual operation, this invention also includes an automatic detection mechanism. When performing ultrasonic testing on the object under test, the distance between the two electric telescopic rods 36 is adjusted by the control program, clamping the object between the two clamping plates 37. Simultaneously, the detection ring 35 is pulled, causing it to be fitted onto the object under test. Under the action of the support spring 61, the probe body 1 is pressed against the bottom of the object under test by the limiting cover. When the drive motor 31 is started, it directly drives the screw 32 to rotate, and indirectly drives the electric telescopic rods 36 to rotate through the belt 38. Under the helical transmission of the axial motion plate 33 and the screw 32, the probe body 1 moves linearly along the axial direction of the screw 32, while the object under test rotates within the detection ring 35. Ultimately, the object under test and the probe body 1 rotate and move linearly relative to each other simultaneously, thus enabling the probe body 1 to move regularly on the object under test, effectively reducing the probability of detection omissions.

[0066] This invention, by setting up a screw 32, a belt 38, and an electric telescopic rod 36, under the drive of the same drive motor 31, causes the rotational motion of the object under test to be associated with the linear motion of the probe body 1, making the detection path of the probe body 1 on the object under test controllable. With the help of a pre-set control program, it is easy to cover the surface of the object under test with the detection path, thereby reducing the probability of detection omissions. At the same time, the automated detection method can also effectively reduce the labor intensity of the staff and enhance the convenience of ultrasonic testing.

[0067] In a preferred embodiment of the present invention, a circulation chamber 4 is installed on the axial motion plate 33. The circulation chamber 4 has a circulation cavity 41 and a diaphragm cavity 42 that are interconnected. An elastic diaphragm 43 is fixedly installed in the diaphragm cavity 42. The negative pressure pipe 26 and the pressure stabilizing pipe 23 both extend into the diaphragm cavity 42, and the negative pressure pipe 26 and the pressure stabilizing pipe 23 are respectively located on both sides of the elastic diaphragm 43. The negative pressure pipe 26 and the pressure stabilizing pipe 23 are both unidirectional pipes. A cam 5 is rotatably installed in the diaphragm cavity 42. A transmission wheel 51 is rotatably installed on the axial motion plate 33. The transmission wheel 51 is connected to the detection frame 3 by friction transmission. The transmission wheel 51 and the cam 5 are connected by a transmission belt 52.

[0068] A filter element 44 is fixedly installed inside the circulation chamber 41. The circulation chamber 41 and the diaphragm chamber 42 are connected by two channels, and the filter element 44 is located between the two channels. It should be noted that a pressure relief valve is also installed at the top of the circulation chamber 41. Under the action of gravity, the pressure relief valve is used to release the air drawn by the negative pressure pipe 26, while the filter element 44 is used to filter the coupling fluid.

[0069] To further enhance the convenience of ultrasonic testing, in this invention, when the axial motion plate 33 moves axially along the screw 32, the transmission wheel 51 and the testing frame 3 are driven by friction, and with the belt drive of the transmission belt 52, the cam 5 rotates in the diaphragm cavity 42. The elastic diaphragm 43, located on the rotation path of the cam 5, reciprocates in the diaphragm cavity 42, causing the volume of the two chambers separated by the elastic diaphragm 43 in the diaphragm cavity 42 to change periodically. With the help of the unidirectional negative pressure pipe 26 and the pressure stabilizing pipe 23, the coupling agent circulates in the coupling chamber 22 and the circulation chamber 41. During the circulation process, it is filtered and impurities are removed by the filter element 44 to realize the recycling of the coupling agent, thereby enhancing the convenience of ultrasonic testing and reducing testing costs.

[0070] An ultrasonic testing method for brazing layers of metal-ceramic composites with large curvature, the method comprising the following steps:

[0071] S1: The control program drives the symmetrical electric telescopic rods 36 to move relative to each other, clamping the object to be tested between the clamping plates 37, and simultaneously starts the drive motor 31 to drive the screw 32 and the electric telescopic rods 36 to rotate.

[0072] S2: During the linear motion of the probe body 1 driven by the axial motion plate 33, the object to be measured rotates at a constant speed, causing the probe body 1 to contact the surface of the object to be measured through the limiting cover.

[0073] S3: During the movement of the axial motion plate 33, the cam 5 pushes the elastic diaphragm 43 to move. With the cooperation of the negative pressure pipe 26 and the pressure stabilizing pipe 23, the coupling fluid fills the coupling chamber 22 and circulates in the coupling chamber 22 and the circulation chamber 41.

[0074] S4: The probe body 1 emits ultrasonic waves, which are transmitted to the object under test in cooperation with the coupling mechanism. The reflected echoes are collected and analyzed to achieve comprehensive detection and evaluation of welding quality.

[0075] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultrasonic testing device for a large curvature metal-ceramic composite brazing layer, comprising a probe body (1), wherein the probe body (1) is used to transmit and receive ultrasonic signals; Its features are: It also includes a coupling mechanism, which is mounted on the probe body (1) and is used to enhance the coupling effect between the probe body (1) and the surface of the object to be measured; The coupling mechanism includes a confinement cover, a coupling fluid, and a pressure stabilizing tube (23). The limiting cover is fixedly installed on the probe body (1). The limiting cover is cone-shaped, and the cone-shaped opening end of the limiting cover faces the surface of the object to be measured. The side of the limiting cover facing the surface of the object to be measured is made of elastic material. The probe body (1), the center of the confinement cover, and the surface of the object to be measured form a coupling chamber (22), which is filled with coupling fluid. The pressure stabilizing pipe (23) is connected to the coupling chamber (22) through a pipe. The pressure stabilizing pipe (23) is used to deliver coupling fluid into the coupling chamber (22) and to maintain the pressure of the coupling fluid in the coupling chamber (22). The limiting cover is composed of a connecting ring (2) and multiple conical covers (21) stacked together. The connecting ring (2) is fixedly installed on the probe body (1). Multiple conical covers (21) are fixedly installed on the connecting ring (2). The diameter of multiple conical covers (21) increases sequentially from the inside to the outside. The opening ends of multiple conical covers (21) are all in contact with the surface of the object to be measured. The multiple conical shields (21) form an interception chamber (24), and an adsorption sponge (25) is fixedly installed in the interception chamber (24). The adsorption sponge (25) is used to fix the coupling liquid flowing out of the coupling chamber (22). A negative pressure tube (26) is fixedly installed inside the interception chamber (24). The negative pressure tube (26) extends into the interior of the adsorption sponge (25), and the negative pressure tube (26) has an opening inside the adsorption sponge (25). It also includes an automatic detection mechanism, on which the probe body (1) is mounted, and the automatic detection mechanism is used to drive the relative movement between the probe body (1) and the object to be tested; The automatic detection mechanism includes a detection frame (3), an axial motion plate (33), a connecting frame (34), a detection ring (35), and a clamping plate (37). The detection frame (3) is a frame structure. A drive motor (31) is rotatably mounted on the detection frame (3). A screw (32) is fixedly mounted on the output end of the drive motor (31). An axial motion plate (33) is slidably mounted on the detection frame (3), and the axial motion plate (33) is screwed to drive the screw (32). A connecting frame (34) is slidably mounted on the axial motion plate (33), and a detection ring (35) is fixedly mounted on one end of the connecting frame (34) away from the axial motion plate (33). The probe body (1) is fixedly mounted on the detection ring (35) at equal intervals. The testing frame (3) is rotatably mounted with symmetrically arranged electric telescopic rods (36), and the output end of the electric telescopic rod (36) is equipped with a clamping plate (37). The object to be tested is clamped and installed between the symmetrical clamping plates (37). The electric telescopic rod (36) and the screw (32) are connected by belt drive through a belt (38). A circulation chamber (4) is installed on the axial motion plate (33). The circulation chamber (4) has a circulation cavity (41) and a diaphragm cavity (42) that are interconnected. An elastic diaphragm (43) is fixedly installed in the diaphragm cavity (42). The negative pressure pipe (26) and the pressure stabilizing pipe (23) both extend into the diaphragm cavity (42), and the negative pressure pipe (26) and the pressure stabilizing pipe (23) are located on both sides of the elastic diaphragm (43). The negative pressure pipe (26) and the pressure stabilizing pipe (23) are both unidirectional pipes. A cam (5) is rotatably installed in the diaphragm cavity (42). A transmission wheel (51) is rotatably installed on the axial motion plate (33). The transmission wheel (51) is connected to the detection frame (3) by friction transmission. The transmission wheel (51) and the cam (5) are connected by a transmission belt (52).

2. The ultrasonic testing device for large curvature metal-ceramic composite brazing layers according to claim 1, characterized in that: A filter element (44) is fixedly installed in the circulation chamber (41). The circulation chamber (41) and the diaphragm chamber (42) are connected by two channels, and the filter element (44) is located between the two channels.

3. The ultrasonic testing device for large curvature metal-ceramic composite brazing layers according to claim 2, characterized in that: The detection ring (35) is located above the axial connecting plate, the opening of the limiting cover is upward, and the connecting frame (34) is a telescopic structure.

4. The ultrasonic testing device for large curvature metal-ceramic composite brazing layers according to claim 3, characterized in that: The probe body (1) and the detection ring (35) are connected by a universal coupling (6), and the probe body (1) is fixedly installed with evenly distributed support springs (61) in the circumferential direction.

5. An ultrasonic testing method for brazed layers of large-curvature metal-ceramic composites, characterized in that: The detection method uses the ultrasonic detection device as described in claim 4, and the detection method includes the following steps: S1: The control program drives the symmetrical electric telescopic rod (36) to move relative to each other, clamping the object to be tested between the clamping plates (37), and simultaneously starts the drive motor (31) to drive the screw (32) and the electric telescopic rod (36) to rotate; S2: During the linear motion of the probe body (1) driven by the axial motion plate (33), the object to be measured rotates at a constant speed, causing the probe body (1) to contact the surface of the object to be measured through the limiting cover. S3: During the movement of the axial motion plate (33), the cam (5) pushes the elastic diaphragm (43) to move. With the cooperation of the negative pressure pipe (26) and the pressure stabilizing pipe (23), the coupling fluid fills the coupling chamber (22) and circulates in the coupling chamber (22) and the circulation chamber (41). S4: The probe body (1) emits ultrasonic waves. With the cooperation of the coupling mechanism, the ultrasonic waves are transmitted to the object to be tested, and the reflected echoes are collected and analyzed to achieve comprehensive detection and evaluation of welding quality.

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