Ultrasonic testing probe for castings

Abstract

The utility model provides a kind of castings ultrasonic testing flaw detection probe, it solves the stable problem of adhering of oblique probe, it includes oblique probe, built-in damping block in oblique probe and piezoelectric wafer installed in the lower end of damping block, piezoelectric wafer is connected with cable plug and cable plug is connected with piezoelectric wafer by electrical adapter, damping block is filled with absorption layer between oblique probe, angle adjusting assembly is installed between damping block and oblique probe, and self-adapting adhering assembly is provided in the lower end of oblique probe.The utility model has the advantages such as good flaw detection effect, stable structure etc.

Description

Technical Field

[0001] This utility model belongs to the field of ultrasonic probe technology, specifically relating to an ultrasonic testing probe for castings and forgings. Background Technology

[0002] Ultrasonic angle probes are a crucial type of probe in ultrasonic nondestructive testing. Unlike straight probes, the key characteristic of angle probes is that the emitted ultrasonic beam does not enter perpendicularly to the surface of the workpiece, but rather at a specific angle of refraction, entering the workpiece's interior at an angle. They typically include a piezoelectric crystal, a wedge, a damping block, a housing, and a connector, used to detect defects that are not parallel to the detection surface. However, in practical applications, the piezoelectric crystal in existing angle probes is permanently fixed behind the wedge, with the crystal's vibrating surface strictly parallel to the wedge's incident surface. The crystal's orientation is tied to the wedge's incident angle and cannot be adjusted independently. Furthermore, while some angle probes offer adjustable piezoelectric crystals to increase beam flexibility, this results in poor stability in contact with the detection surface.

[0003] To address the shortcomings of existing technologies, people have conducted long-term explorations and proposed various solutions. For example, Chinese patent literature discloses an adjustable incident angle ultrasonic angle probe [201910645198.1], which includes an angle switching rod, a semi-circular track, and a sound wave emitting assembly. The sound wave emitting assembly is located inside the track, which is filled with glycerin. A protective film is provided at the bottom of the track, and the outer side of the remaining part is wrapped with sound-absorbing material. A track break is provided at the top of the track. One end of the angle switching rod passes through the track break and extends into the track, connecting to the outer side of the sound wave emitting assembly. By moving the angle switching rod left and right, the sound wave emitting assembly is rotated in the track. The sound wave emitting assembly is connected to an ultrasonic instrument via a cable and an external connector.

[0004] The above solution has solved the problem of angle adjustment of the angle probe to a certain extent, but it still has many shortcomings, such as poor stability of adhesion to the detection surface. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a reasonably designed ultrasonic testing probe for castings and forgings that offers good fit and stability.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an ultrasonic testing probe for castings and forgings, comprising an angle probe, a damping block built into the angle probe and a piezoelectric crystal installed at the lower end of the damping block, the piezoelectric crystal being connected to a cable plug and the cable plug being connected to the piezoelectric crystal through an electrical adapter, an absorption layer being filled between the damping block and the angle probe, an angle adjustment component being installed between the damping block and the angle probe, and an adaptive fitting component being provided at the lower end of the angle probe.

[0007] In the ultrasonic testing probe for castings and forgings described above, a receiving groove is opened at the lower edge of the angle probe, and an adaptive fitting component is installed in the receiving groove. Movable grooves are provided inside both sides of the angle probe, and an angle adjustment component is installed in the movable groove.

[0008] In the aforementioned ultrasonic testing probe for castings and forgings, the angle adjustment assembly includes a movable plate that is fitted and fixed in a movable groove. The movable plate and the damping block each have movable discs that press against each other, and the side of the movable discs that are fitted together is provided with movable conical surfaces that press against each other.

[0009] In the ultrasonic testing probe for castings and forgings described above, the movable conical surfaces each have centrally symmetrically arranged limiting teeth, and the limiting teeth of the mutually fitting movable conical surfaces mesh with each other. The movable plate is made of elastic material.

[0010] In the aforementioned ultrasonic testing probe for castings and forgings, the adaptive bonding assembly includes a bonding strip installed in a receiving groove. The lower end of the bonding strip has a bonding edge extending to the bottom of the angled probe. The middle part of the bonding strip is rotatably connected to the receiving groove. The bonding strip is movably connected to the movable disc on the damping block via a linkage rod.

[0011] In the ultrasonic testing probe for castings and forgings described above, the angled probe is made of aluminum alloy, and there are indicator scales distributed on the lower ends of both sides of the angled probe.

[0012] In the ultrasonic testing probe for castings and forgings described above, the damping block is made of rubber and is isolated from the inner wall of the angle probe.

[0013] In the ultrasonic testing probe for castings and forgings described above, the damping block has a mounting groove for embedding a power adapter.

[0014] In the ultrasonic testing probe for castings and forgings described above, the absorption layer is made of a composite material of epoxy resin and tungsten powder.

[0015] In the ultrasonic testing probe for castings and forgings described above, a piezoelectric film is attached and fixed to the lower end of the angle probe, and the piezoelectric film is connected to the cable plug.

[0016] Compared with existing technologies, the advantages of this invention are as follows: the angle adjustment component and the adaptive bonding component work together to maintain the bonding stability between the angle probe and the detection surface while adjusting the orientation of the piezoelectric crystal; the angle adjustment component has a built-in locking structure to limit the angle without affecting the flexibility of adjustment; the angle probe has a built-in piezoelectric sensing element to monitor its bonding status in real time and ensure detection accuracy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2This is a structural cross-sectional view of the present invention;

[0019] Figure 3 This is another structural schematic diagram of the present invention;

[0020] Figure 4 This is another structural cross-sectional view of the present invention;

[0021] In the figure, the components are: angled probe 1, receiving groove 11, movable groove 12, indicator scale 13, piezoelectric film 14, damping block 2, piezoelectric crystal 3, cable plug 4, electrical adapter 5, absorption layer 6, angle adjustment assembly 7, movable plate 71, movable disk 72, movable cone surface 73, limiting tooth 74, adaptive bonding assembly 8, bonding strip 81, bonding edge 82, and linkage rod 83. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1-4 As shown, an ultrasonic testing probe for castings and forgings includes an angled probe 1, a damping block 2 built into the angled probe 1, and a piezoelectric crystal 3 installed at the lower end of the damping block 2. The piezoelectric crystal 3 is preferably a 2.5MHz or 5.0MHz lead zirconate titanate crystal with a thickness of 0.5mm-1.0mm. The piezoelectric crystal 3 is connected to a cable plug 4, and the cable plug 4 is connected to the piezoelectric crystal 3 through an electrical adapter 5. The electrical adapter 5 includes a miniature impedance matching circuit for optimizing the transmission efficiency and signal-to-noise ratio of high-frequency ultrasonic signals. An absorption layer 6 is filled between the damping block 2 and the angled probe 1. The absorption coefficient of the absorption layer 6 is greater than 30dB, which can effectively suppress the clutter radiated from the back of the crystal. An angle adjustment component 7 is installed between the damping block 2 and the angled probe 1. An adaptive fitting component 8 is provided at the lower end of the angled probe 1.

[0024] Specifically, a receiving groove 11 is opened at the lower edge of the angle probe 1, and the adaptive fitting component 8 is installed in the receiving groove 11. Movable grooves 12 are provided inside both sides of the angle probe 1, and the angle adjustment component 7 is installed in the movable groove 12. The inner wall of the movable groove 12 is provided with a low friction coefficient coating, such as a polytetrafluoroethylene coating, to reduce the sliding resistance of the movable piece 71.

[0025] Specifically, the angle adjustment assembly 7 includes a movable piece 71 that is fitted and fixed in the movable groove 12. The movable piece 71 and the damping block 2 each have a movable disc 72 that presses against each other to ensure coaxiality when they move relative to each other. The side of the movable disc 72 that is fitted with each other has a movable conical surface 73 that presses against each other.

[0026] Furthermore, each of the movable conical surfaces 73 has a centrally symmetrically arranged limiting tooth 74. The limiting teeth 74 of the mutually fitting movable conical surfaces 73 mesh with each other. The limiting teeth 74 have a self-locking characteristic to prevent the angle from accidentally retracting due to vibration or pressure changes during the detection process. The movable plate 71 is made of elastic material to provide stable elastic restoring force.

[0027] Furthermore, the adaptive bonding component 8 includes a bonding strip 81 installed in the receiving groove 11. The lower end of the bonding strip 81 is provided with a bonding edge 82 extending to the bottom of the angle probe 1. The bottom surface of the bonding edge 82 is bonded with a wear-resistant and acoustically impedance-matched polyurethane elastic layer with a thickness of about 1mm. The middle part of the bonding strip 81 is rotatably connected to the receiving groove 11. The bonding strip 81 is movably connected to the movable disk 72 on the damping block 2 through the linkage rod 83 to adapt to the spatial position changes caused by angle adjustment.

[0028] In addition, the angle probe 1 is made of aluminum alloy and its sound velocity has been precisely calibrated. The lower ends of both sides of the angle probe 1 are marked with indicator scales 13.

[0029] Meanwhile, the damping block 2 is made of rubber and is isolated from the inner wall of the angle probe 1. The isolation gap is about 0.2mm-0.5mm and is filled with low-viscosity silicone oil as an acoustic coupling medium to ensure that the vibration energy of the damping block is effectively dissipated and not transmitted to the outer shell.

[0030] As can be seen, the damping block 2 has a mounting slot 21 for the electrical adapter 5 to be embedded, ensuring that the electrical adapter 5 is accurately positioned and protected from mechanical impact.

[0031] Clearly, the absorption layer 6 is made of a composite material of epoxy resin and tungsten powder to achieve high density and wide bandwidth absorption characteristics.

[0032] Preferably, a piezoelectric film 14 is attached and fixed to the lower end of the angle probe 1. The piezoelectric film 14 is a polyvinylidene fluoride film with a thickness of about 0.1 mm and is distributed in an array. The piezoelectric film 14 is connected to the cable plug 4 and is used to monitor the contact pressure and coupling status between the probe and the workpiece surface in real time. The signal is fed back to the detection instrument through an independent channel.

[0033] More preferably, the key contact area at the bottom of the angled probe 1 is inlaid with a hard wear-resistant sheet, such as a zirconia ceramic sheet, to enhance its wear resistance.

[0034] In addition, the top of the probe housing is equipped with heat dissipation fins to accelerate the dissipation of heat when the damping block 2 and the electrical adapter 5 are working.

[0035] In summary, the principle of this embodiment is as follows: the acoustic attenuation structure formed by the damping block 2 and the absorption layer 6 suppresses the stray vibration of the piezoelectric crystal 3 and optimizes the pulse width. At the same time, the meshing movable cone surface 73 driven by the elastic movable piece 71 in the angle adjustment component 7 and the limiting tooth 74 realize the precise angle locking and self-locking anti-retraction of the damping block 2. Combined with the linkage rod 83, the change in the angle of the damping block is transmitted to the adaptive bonding component 8 in real time. The bonding edge 82 dynamically bonds to the curved surface of the workpiece, and the contact state is monitored by the piezoelectric film 14 array. Finally, with the guarantee of the impedance matching circuit, high signal-to-noise ratio ultrasonic testing of the complex surface of the casting and forging is realized.

[0036] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0037] Although this document frequently uses terms such as angled probe 1, receiving groove 11, movable groove 12, indicating scale 13, piezoelectric film 14, damping block 2, piezoelectric wafer 3, cable plug 4, electrical adapter 5, absorption layer 6, angle adjustment assembly 7, movable piece 71, movable disc 72, movable cone surface 73, limiting tooth 74, adaptive bonding assembly 8, bonding strip 81, bonding edge 82, and linkage rod 83, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. An ultrasonic testing probe for castings and forgings, comprising an angled probe (1), wherein the angled probe (1) has a built-in damping block (2) and a piezoelectric crystal (3) installed at the lower end of the damping block (2), wherein the piezoelectric crystal (3) is connected to a cable plug (4) and the cable plug (4) is connected to the piezoelectric crystal (3) via an electrical adapter (5), wherein an absorption layer (6) is filled between the damping block (2) and the angled probe (1), characterized in that, An angle adjustment component (7) is installed between the damping block (2) and the angle probe (1), and an adaptive fitting component (8) is provided at the lower end of the angle probe (1).

2. The ultrasonic testing probe for castings and forgings according to claim 1, characterized in that, The angle probe (1) has a receiving groove (11) at its lower edge, and the adaptive fitting component (8) is installed in the receiving groove (11). The angle probe (1) has movable grooves (12) on both sides, and the angle adjustment component (7) is installed in the movable grooves (12).

3. The ultrasonic testing probe for castings and forgings according to claim 2, characterized in that, The angle adjustment component (7) includes a movable piece (71) that is fitted and fixed in the movable groove (12). The movable piece (71) and the damping block (2) each have a movable disc (72) that presses against each other. The movable disc (72) has a movable conical surface (73) that presses against each other on the side where it is fitted.

4. The ultrasonic testing probe for castings and forgings according to claim 3, characterized in that, The movable conical surfaces (73) are respectively equipped with limiting teeth (74) arranged in a centrally symmetrical manner. The limiting teeth (74) of the movable conical surfaces (73) mesh with each other. The movable plate (71) is made of elastic material.

5. The ultrasonic testing probe for castings and forgings according to claim 3, characterized in that, The adaptive bonding component (8) includes a bonding strip (81) installed in the receiving groove (11). The lower end of the bonding strip (81) is provided with a bonding edge (82) extending to the lower part of the angled probe (1). The middle part of the bonding strip (81) is rotatably connected to the receiving groove (11). The bonding strip (81) is movably connected to the movable disk (72) on the damping block (2) through the linkage rod (83).

6. The ultrasonic testing probe for castings and forgings according to claim 1, characterized in that, The angle probe (1) is made of aluminum alloy, and the lower ends of both sides of the angle probe (1) are provided with indicator scales (13).

7. The ultrasonic testing probe for castings and forgings according to claim 1, characterized in that, The damping block (2) is made of rubber and is isolated from the inner wall of the angle probe (1).

8. The ultrasonic testing probe for castings and forgings according to claim 1, characterized in that, The damping block (2) has a mounting slot (21) into which the power adapter (5) is embedded.

9. The ultrasonic testing probe for castings and forgings according to claim 1, characterized in that, The absorbent layer (6) is made of a composite material of epoxy resin and tungsten powder.

10. The ultrasonic testing probe for castings and forgings according to claim 1, characterized in that, The lower end of the angle probe (1) is attached to a piezoelectric film (14), which is connected to the cable plug (4).

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