Coupling force testing device based on dry coupling ultrasonic detection

Abstract

The utility model belongs to the technical field of nondestructive testing, and relates to a coupling force testing device based on dry coupling ultrasonic testing, which comprises a supporting piece, a hand-cranking lead screw clamp, a pull pressure sensor, a probe clamping device, a base flat plate and a probe, after the hand-cranking lead screw clamp is installed on the supporting piece, the supporting piece is installed on the base flat plate, and the lower end of the supporting piece is connected with the pull pressure sensor through a flange connector. A probe clamping device is mounted at the lower end of the tension and pressure sensor, and a probe is placed in the probe clamping device during testing; during testing, the coupling material and the test block are sequentially placed below the probe, and the hand-cranking lead screw clamp is rotated to downwards apply pressure to the probe, the coupling material and the test block so that a dry coupling interface can be generated among the probe, the coupling material and the test block; the device can prevent the abrasion of the probe from being aggravated, and can play an important role in the detection process of a workpiece in which a liquid coupling agent cannot be used.

Description

Technical Field

[0001] The utility model belongs to the technical field of nondestructive testing, and relates to a coupling force testing device based on dry-coupling ultrasonic testing. Background Art

[0002] The existence of air between the probe and the interface of the workpiece to be inspected causes ultrasonic waves to be reflected during propagation and unable to enter the workpiece to be inspected. Usually, a layer of coupling agent needs to be applied between the interfaces to improve the transmission efficiency of acoustic energy. Currently, liquid coupling agents with good coupling effects and low prices are generally used for testing, such as machine oil, glycerin, water, etc. However, liquid coupling agents will contaminate the surface of the material to be inspected, cannot be recycled, and are not convenient for use in large-plane or high-speed scanning inspections.

[0003] The dry-coupling detection technology of ultrasonic waves does not require a liquid coupling agent during the detection process. By applying pressure, elastic coupling materials such as probes, rubber, or hydrophilic polymers are closely contacted with the surface of the workpiece to be inspected to form a dry-coupling interface, enabling ultrasonic waves to enter the workpiece to be inspected for detection.

[0004] By studying the influence relationship between the coupling force (the pressure acting on the probe) and the coupling effect (reflected by the echo height of the ultrasonic signal in the A-scan waveform), the optimal coupling force when using different coupling materials can be determined, so that the detection equipment can achieve good results. Studying a mechanism device that can test the influence relationship between the coupling force and the coupling effect can determine the optimal coupling force during the dry-coupling detection process, avoid the aggravation of probe wear and the reduction of service life, and can also be used to study the influence of factors such as different coupling materials and surface roughness on the coupling effect, which is of extremely important significance for the research and application of dry-coupling ultrasonic detection technology.

[0005] During the ultrasonic detection process of the prior art, it is usually necessary to apply a liquid coupling agent between the interface of the probe and the workpiece to be inspected. However, the liquid coupling agent will contaminate the surface of the material to be inspected, cannot be recycled, and is not convenient for use in large-plane or high-speed scanning inspections. The dry-coupling detection technology of ultrasonic waves can achieve detection without a liquid coupling agent during the detection, but the influence relationship between the coupling force and coupling material used on the ultrasonic signal is unknown. Summary of the Invention

[0006] The purpose of the utility model: to provide a coupling force testing device based on dry-coupling ultrasonic testing, which can better study the influence relationship between factors such as coupling force, coupling material, and surface roughness on the coupling effect, and can be used to explore the optimal coupling force and coupling material to improve the detection efficiency.

[0007] In order to solve the above technical problems, the technical solution of the utility model:

[0008] A coupling force testing device based on dry-coupling ultrasonic testing, the device comprising: a support member 1, a hand-operated lead screw clamp 2, a tensile and compressive force sensor 3, a probe clamping device 5, a base plate 6, and a probe 7; after the hand-operated lead screw clamp 2 is installed on the support member 1, the support member 1 is installed on the base plate 6, and the lower end of the support member 1 is connected to the tensile and compressive force sensor 3 through a flange joint 10;

[0009] The lower end of the pressure sensor 3 is fixedly connected to the probe clamping device 5, and the probe 7 is placed in the probe clamping device 5 during testing;

[0010] Specifically, the support member 1 is a frame structure composed of a support column and an upper pressure plate, and the hand-operated lead screw clamp 2 is installed on the upper pressure plate.

[0011] During testing, a coupling material 8 and a test block 9 are sequentially placed below the probe 7, and the hand-operated lead screw clamp 2 is rotated to apply pressure downward on the probe 7, the coupling material 8, and the test block 9 to generate a dry-coupling interface among the three.

[0012] In the probe clamping device 5, the probe clamping area is an open circular structure, adjustment screws are symmetrically arranged on both sides of the opening, the adjustment screws are used to fix the probe and ensure the coaxiality of the probe, and the opening is used to avoid the connecting wire of the probe;

[0013] The probe 7 is in clearance fit with the probe clamping device 5. Specifically, the inner diameter of the circular structure is in clearance fit with the outer diameter of the probe; the clearance is 1 to 1.5 mm. Through the adjustment screws and the clearance fit, the whole device can maintain good coaxiality, so that the probe is perpendicular to the detection surface during the downward pressing process of the probe during testing, and a more ideal detection effect can be obtained.

[0014] The flange surface of the flange joint 10 is connected to the tensile and compressive force sensor 3 by screws.

[0015] The back surface of the probe clamping device 5 is connected to the tensile and compressive force sensor 3 by countersunk head screws using a flange surface;

[0016] The device further includes a control and display instrument 4, and the control and display instrument 4 is connected to the tensile and compressive force sensor 3.

[0017] The coupling material 8 is a hydrophilic material.

[0018] Advantages of the present utility model:

[0019] The coupling force testing device based on dry-coupling ultrasonic testing of the present utility model, on the one hand, can better study the influence relationship among factors such as coupling force, coupling material, and surface roughness on the coupling effect, and improve the detection efficiency.

[0020] On the other hand, it can avoid the aggravation of probe wear and extend the service life. It can also provide a reference basis for the selection of coupling materials, improve the sound propagation efficiency, and play an important role in the detection process of workpieces that cannot use liquid couplants. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions implemented by the present utility model, the drawings to be used in the examples of the present utility model will be briefly explained below. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 A three-dimensional schematic diagram of the coupling force testing device of the present utility model;

[0023] Figure 2 The three-view drawings of the coupling force testing device of the present utility model, namely the left view, the front view, and the top view;

[0024] Figure 3 The three-view drawings of the flange joint of the coupling force testing device of the present utility model, namely the left view, the sectional view, and the top view;

[0025] Figure 4 The three-view drawings of the probe clamping device of the coupling force testing device of the present utility model, namely the left view, the sectional view, and the top view;

[0026] In the figures, 1 - support member, 2 - hand-operated lead screw clamp, 3 - tension and compression sensor, 4 - control and display instrument, 5 - probe clamping device, 6 - base plate, 7 - probe, 8 - coupling material, 9 - test block, 10 - flange joint. Detailed Embodiments

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0028] Aspects of the embodiments of the present utility model will be described in detail below. In the following detailed description, many specific details are presented to provide a comprehensive understanding of the present utility model. However, it is obvious to those of ordinary skill in the art that the present utility model can also be implemented without these specific details. The following description of the embodiments is only for a better understanding of the present utility model by showing examples of the present utility model. The present utility model is not limited to any specific settings and methods provided below, but covers all product structures, any improvements, replacements, etc. of the methods without departing from the spirit of the present utility model.

[0029] In each of the drawings and the following description, well-known structures and technologies are not shown to avoid unnecessarily obscuring the present utility model. The coupling force testing device of the present utility model is as Figure 1 shown.

[0030] First, install the support member 1 on the base plate 6. The support member 1 is composed of a support column and an upper pressing plate to form a frame structure. Then, install the hand-operated screw clamp 2 on the support member. A pull-pressure sensor 3 (connected to a control display instrument 4) is connected to the lower end through a flange joint 10. The flange joint 10 is connected to the screw by screws, and the flange surface is connected to the pull-pressure sensor 3 by screws.

[0031] A probe clamping device 5 is added to the lower end of the pull-pressure sensor 3. During testing, the probe 7 is placed in the probe clamping device 5 and fixed with adjusting screws. The back of the probe clamping device 5 is connected to the pull-pressure sensor 3 by a flange surface using countersunk head screws. The probe clamping area is an open circular structure. Adjusting screws are symmetrically arranged on both sides of the opening. The adjusting screws are used to fix the probe and ensure the coaxiality of the probe. The opening is used to avoid the connecting wire of the probe. The inner diameter of the circular structure has a clearance fit with the outer diameter of the probe, and the clearance is 1.5 mm.

[0032] After fixing the hand-operated screw clamp 2, the flange joint, the center line of the pull-pressure sensor 3, the probe clamping device 5, the probe 7, etc. with screws, the center lines of each part are kept on a straight line and perpendicular to the base plate 6, so that the whole device can maintain good coaxiality, and it can make the probe perpendicular to the detection surface during the downward pressing process during testing, obtaining a more ideal detection effect.

[0033] During testing, the coupling material 8 and the test block 9 are sequentially placed under the probe 7, and the hand-operated screw clamp 2 is rotated downward to apply pressure to the probe 7, the coupling material 8 and the test block 9 to generate a dry coupling interface among the three. The test block 9 is the workpiece to be inspected, and the coupling material 8 is a hydrophilic material, specifically a hydrogel.

[0034] By observing the pressure value displayed on the control display instrument 4 and the change in the echo height of the A-scan waveform of the workpiece under inspection on the ultrasonic A-scan device, analyze the influence relationship of factors such as coupling force, coupling material, and surface roughness on the coupling effect.

[0035] The testing process of the coupling force testing device of the present utility model is as follows:

[0036] (1) First, install the support member 1 on the base plate 6, then install the hand-operated lead screw clamp 2 on the support member, and connect a tensile and compressive force sensor 3 (connected to the control display instrument 4) at the lower end through a flange joint. Add a probe clamping device 5 at the lower end of the tensile and compressive force sensor 3. During testing, place the probe 7 in the probe clamping device 5 and fix it with an adjusting screw.

[0037] (2) During testing, place the coupling material 8 (coupling material) and the test block 9 in sequence under the probe 7, and apply pressure to the probe 7, coupling material 8, and test block 9 by rotating the hand-operated lead screw clamp 2 downward to generate a dry coupling interface among the three.

[0038] (3) By observing the pressure value displayed on the control display instrument 4 and the change in the echo height of the A-scan waveform of the workpiece under inspection on the ultrasonic A-scan device (the bottom surface echo height of the test block 9), analyze the influence relationship of factors such as coupling force, coupling material, and surface roughness on the coupling effect.

[0039] (4) Through experimental observation, it is found that as the pressure increases, the echo height of the A-scan waveform first rises and then tends to be stable; the coupling effects are different for different coupling materials; the smaller the surface roughness of the coupling material used, the better the coupling effect.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present utility model, and these modifications or substitutions should all be covered within the protection scope of the present utility model.

Claims

1. A coupling force testing device based on dry coupling ultrasonic detection, characterized in that: The device comprises: a support member (1), a hand-cranked screw fixture (2), a tension and pressure sensor (3), a probe clamping device (5), a base plate (6), and a probe (7); after the hand-cranked screw fixture (2) is installed on the support member (1), the support member (1) is installed on the base plate (6), and the lower end of the support member (1) is connected to the tension and pressure sensor (3) via a flange joint (10); the lower end of the tension and pressure sensor (3) is fixedly connected to the probe clamping device (5), and the probe (7) is placed in the probe clamping device (5) during testing; During the test, the coupling material (8) and the test block (9) are placed in sequence below the probe (7), and the hand-cranked screw fixture (2) is rotated to apply pressure downward to the probe (7), the coupling material (8) and the test block (9) so that a dry coupling interface is generated between the three.

2. The coupling force testing device according to claim 1, characterized in that: In the probe clamping device (5), the probe clamping area is an open circular structure, and adjustment screws are symmetrically arranged on both sides of the opening. The adjustment screws are used to fix the probe and ensure the coaxiality of the probe, and the opening is used to avoid the connection line of the probe.

3. The coupling force testing device according to claim 2, characterized in that: The probe (7) and the probe clamping device (5) are clearance matched, specifically, the inner diameter of the circular structure is clearance matched with the outer diameter of the probe.

4. The coupling force testing device according to claim 1, characterized in that: The support member (1) is a frame structure consisting of a support column and an upper pressing plate, and the hand-cranked screw clamp (2) is installed on the upper pressing plate.

5. The coupling force testing device according to claim 1, characterized in that: The flange surface of the flange joint (10) is connected to the tension and pressure sensor (3) by means of screws.

6. The coupling force testing device according to claim 1, characterized in that: The back side of the probe clamping device (5) is connected to the tension and pressure sensor (3) by means of a flange surface using countersunk screws.

7. The coupling force testing device according to claim 1, characterized in that: The device also includes a control display instrument (4), and the control display instrument (4) is connected to the tension and pressure sensor (3).

8. The coupling force testing device according to claim 1, characterized in that: The coupling material (8) is a hydrophilic material.

9. The coupling force testing device according to claim 3, characterized in that: The gap is 1 to 1.5 mm.

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