A push-button lead-breaking device for acoustic emission detection technology

Abstract

The present invention relates to the field of acoustic emission detection technology, and specifically to a push-button lead-breaking device for use in acoustic emission detection technology. The device primarily comprises a pushbutton, a vertical rod, a spring, a horizontal rod, a buckle, a shock absorber, a hollow cylinder, a connecting rod, and a pedestal. The bottom of the pushbutton is provided with a screw hole. Bolts are provided at the upper and lower ends of the vertical rod. The upper end is mounted with the pushbutton, and the lower end is mounted with the horizontal rod. The upper half of the rod is wound with a spring, and the lower half extends into the hollow cylinder. Screw holes are provided at the left end and upper portion of the horizontal rod. The upper portion is connected to the vertical rod. Four shock absorbers are welded to the right half of the rod and extend into the interior of the hollow cylinder. The buckle is used to clamp a pencil and has a bolt at the rear end that is mounted on the horizontal rod. Four shock absorbers are welded into the interior of the hollow cylinder. The upper end of the connecting rod is welded to the bottom of the hollow cylinder, and the lower end is provided with a screw hole. The upper end of the pedestal is provided with a screw hole. The connecting rod and the pedestal are connected via the screw hole to adjust the height of the device. The present invention utilizes a pushbutton to drive the device to break leads, resulting in a simple structure, easy operation, and high repeatability and stability.

Description

Technical Field

[0001] The invention relates to the field of non-destructive testing, and in particular to a button-type pencil lead breaking device for generating an acoustic emission simulation signal during an acoustic emission non-destructive testing process. Background Art

[0002] Acoustic Emission (AE) technology is a dynamic non-destructive testing technology. It is widely used in dynamic monitoring and damage assessment of various materials such as metals, alloys, glass, ceramics, plastics, concrete, etc. It is known as one of the most reliable and mature non-destructive testing technologies. The lead break test is one of the main test methods of acoustic emission technology in the laboratory. The acoustic emission signal generated by the breakage of the pencil lead is a typical burst signal. The lead break test refers to the use of the acoustic emission signal generated by the breakage of the pencil lead to simulate the acoustic emission signal of the material under test. The main functions are: ① Determine the wave velocity in the material; ② Test whether the coupling between the sensor and the material surface is reliable; ③ Study the influence of material defects on the acoustic emission simulation signal, and then establish the connection between the acoustic emission simulation signal and the internal defects of the material. It can be seen that the lead break test is very important for acoustic emission technology. At present, GB / T18182-2012 and the American Society for Testing and Materials ( The ASTM-E976 standard specifies that the acoustic emission signal is simulated using the signal generated by breaking a 0.5 mm HB pencil lead, stretched 3 mm, at a 30° angle to the beam plane. Theoretically, the lead-breaking test should be a stable, reliable, and highly repeatable test method. However, when manually breaking the lead, the angle between the pencil and the material being tested and the force used to manually break the pencil lead are difficult to control. This results in a highly random signal, poor stability, reliability, and comparability. Furthermore, the pencil easily contacts the material surface, generating unwanted signals and failing to achieve the desired results. Therefore, a device that can stably break the pencil lead is urgently needed to avoid the errors associated with manual lead-breaking tests. Summary of the Invention

[0003] The present invention aims to provide a push-button lead-breaking device for acoustic emission detection technology, which provides a relatively stable and highly repeatable acoustic emission simulation signal for the lead-breaking test, so as to avoid the errors caused by the existing lead-breaking technology due to the inability to accurately control the angle and force and the contact between the pencil and the material surface.

[0004] The present invention adopts the following technical scheme: a button-type lead-breaking device for acoustic emission detection technology, comprising a button, a vertical rod, a spring, a horizontal rod, a buckle, a shock absorber, a hollow cylinder, a connecting rod and a pedestal; wherein the button is rotatably connected to the upper end of the vertical rod through a thread; the lower end of the vertical rod is rotatably connected to the upper part of the horizontal rod through a thread; the spring is wound around the upper part of the vertical rod; the left end of the horizontal rod is rotatably connected to the buckle through a thread; the buckle fixes the pencil through a screw, and the angle of the pencil can be adjusted by adjusting the rotation angle of the buckle; two shock absorbers are welded on the upper and lower sides of the right part of the vertical rod; the upper part of the hollow cylinder is open so that the lower part of the vertical rod can be extended into the interior of the hollow cylinder; the left part of the hollow cylinder is open so that the right part of the horizontal rod can be extended into the interior of the hollow cylinder, and two shock absorbers are welded on the upper and lower sides of the hollow cylinder, which are opposite to the shock absorber on the horizontal rod; the upper end of the connecting rod is welded at the center of the bottom of the hollow cylinder; three screw holes are provided at the lower end of the connecting rod, and one screw hole is provided at the upper end of the pedestal, and the connecting rod and the pedestal are connected and fixed with screws through the screw holes. Changing the connecting screw holes can change the height of the device, thereby changing the height of the pencil. During operation, first assemble all parts of the device, keeping the spring in its original relaxed state; place the lead-breaking device on the object to be tested, use screws to reinforce the buckle to clamp the pencil and adjust the angle and height of the pencil to the predetermined position according to the test needs; press the button, and the vertical rod drives the horizontal rod and the buckle to descend, causing the pencil lead to break and obtain the simulated acoustic emission signal required for the experiment; release the button, the spring recovers, and the device is reset.

[0005] The device adjusts the lead breaking angle by rotating the buckle. On the one hand, it can accurately control the lead breaking angle, and on the other hand, it can change the lead breaking angle according to the requirements of the test plan. Although GB / T18182-2012 and the American Society for Testing and Materials ( The ASTM-E976 standard specifies a 30° lead break angle. However, during testing, it is necessary to study the differences in propagation characteristics between acoustic emission signals with different parameter characteristics to obtain more universal conclusions. The device described above can obtain simulated acoustic emission signals with different parameter characteristics by adjusting the lead break angle.

[0006] When the clip is clamping the pencil, the length of the extended pencil lead should be 2.5 mm and in good contact with the surface of the object to be measured. It should not be too long or too short to avoid poor lead break signals or redundant signals generated by the pencil contacting the surface again after the lead is broken.

[0007] The present invention has at least the following beneficial technical effects:

[0008] The present invention achieves the purpose of adjusting the lead-breaking angle and clamping the mechanical pencil through the clamp and the buckle, and can not only accurately control the lead-breaking angle, but also break the lead at any angle and generate lead-breaking signals with different characteristics.

[0009] The present invention drives the device to break the lead by pressing a button, thereby replacing manual lead breaking, solving the problem of uncontrollable force in manual lead breaking, and preventing the pencil from making secondary contact with the material surface, thereby avoiding the generation of redundant signals.

[0010] Therefore, compared with the existing lead-breaking method, the present invention can easily stimulate a variety of stable, reliable, and highly comparable signals, and is simple to operate and highly repeatable, which has important practical significance for laboratory research on acoustic emission technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0012] Figure 2 It is a cross-sectional view of the overall structure of the present invention.

[0013] Figure 3 Schematic diagram of each rotating screw hole bolt.

[0014] Figure 4 A schematic diagram of the base.

[0015] Figure 5 This is a schematic diagram of an acoustic emission test for detecting lead breakage using the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The specific embodiments described are only for explanation of the present invention and are not intended to limit the present invention.

[0017] In the description of this application, it should be understood that the terms "center", "middle", "upper surface", "upper end", "upper part", "lower end", "inside", "surface", "vertical", "horizontal", etc. indicate orientations or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the device described in this application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, structure and operation in a specific orientation, and therefore cannot be understood as limiting the scope of protection of this application.

[0018] like Figure 1 As shown, the present invention is a button-type lead-breaking device for acoustic emission detection technology, comprising a button 1, a rotating screw hole bolt 2, a spring 3, a vertical rod 4, an automatic pencil 5, a rotating screw hole bolt 6, a rotating screw hole bolt 7, a hollow cylinder 8, a buckle 9, a cross bar 10, a shock absorber 11, a connecting rod 12, a screw hole 13 and a base 14; wherein the spring is wound around the upper part of the vertical rod 4; wherein the rotating screw hole bolts 2, 6, and 7 are all rotationally connected, while the buckle 9 and the screw hole 13 need to be fixed with screws; wherein there are a total of eight shock absorbers 11, which are respectively welded to the inside of the hollow cylinder 8 and the surface of the cross bar 10, and the positions correspond to each other.

[0019] like Figure 2 The hollow tube 8 shown has openings on its upper surface and left side. The upper surface opening is smaller, so that the vertical rod 4 can extend into the interior of the hollow tube 8. The left side opening is larger, so that the cross bar 10 can extend into the interior of the hollow tube 8 and can move up and down within a certain range, thereby achieving the purpose of controlling the movement of the pencil and breaking the pencil lead.

[0020] like Figure 3 The screw hole for rotating bolt 2 is located at the bottom center of button 1, and the bolt is located at the top end of vertical rod 4. The screw hole for rotating bolt 6 is located at the left end of horizontal rod 10, and the bolt is located behind buckle 9. The screw hole for rotating bolt 7 is located at the top of horizontal rod 10, and the bolt is located at the bottom end of vertical rod 4. Rotating bolts 2, 6, and 7 are all rotating connections and do not require screw fastening. Adjusting the rotation angle of buckle 9 can adjust the angle of the pencil.

[0021] like Figure 4 The center of the bottom of the hollow cylinder 8 is welded to the upper end of the connecting rod 12. Three screw holes 13 are provided at the lower portion of the connecting rod 12, and one screw hole 13 is provided at the upper end of the base 14. The connecting rod 12 and the base 14 are connected by screws through the screw holes 13. By connecting the base to different screw holes on the connecting rod 12, the height of the pencil can be adjusted.

[0022] like Figure 5 The schematic diagram of the acoustic emission test for lead breakage detection using the present invention is shown. The specific implementation steps are as follows:

[0023] Step 1: Clean the surface of the object to be tested, sweep away dust and polish it smooth.

[0024] Step 2: After installing the acoustic emission equipment, open the computer and acquisition software. Use vaseline as a coupling agent to attach the acoustic emission sensor to the surface of the object to be tested as specified in the test plan.

[0025] Step 3: Place the device of the present invention on the surface of the test piece, adjust the angle of the buckle 9 and the connection height of the screw hole 13 to reach the predetermined position in the test plan, install a mechanical pencil with a 0.5mm lead in the buckle 9, and fix it with a screw to ensure that the lead is in contact with the surface of the object to be tested.

[0026] Step 4: Press the button, and the vertical rod drives the horizontal rod and the buckle to descend, breaking the pencil lead and obtaining the simulated acoustic emission signal required for the experiment; release the button, the spring recovers, and the driving device resets.

[0027] The present application describes a push-button lead-breaking device for acoustic emission detection technology, which simulates the pencil lead breakage signal of a manual lead-breaking test. It can not only accurately control the lead-breaking angle and height, but also change the lead-breaking angle and adjust the lead-breaking height according to the needs of the test plan, and has comparability and repeatability. The push-button design avoids errors caused by unstable force in manual lead-breaking tests and avoids the situation where the pencil contacts the surface of the object to be tested for the second time after the pencil lead breaks to generate redundant signals. The design is simple, the operation is convenient, and it has stability, reliability and controllability.

Claims

1. A push-button lead-breaking device for acoustic emission detection technology, characterized in that: include: A base (14), wherein a screw hole (13) is provided at an upper end of the base; A connecting rod (12), wherein the upper end of the connecting rod (12) is welded to the bottom center of the hollow cylinder (8), and the other end is provided with three screw holes (13). The connecting rod (12) is connected to the base (14) through screws and screw holes (13). Connecting different screw holes can adjust the height of the upper part of the device, thereby adjusting the height of the pencil (5); A hollow cylinder (8), wherein the upper surface of the hollow cylinder (8) is open so that the vertical rod (4) extends into the interior of the hollow cylinder (8), and the left portion of the hollow cylinder (8) is open so that the horizontal rod (10) extends into the interior of the hollow cylinder (8) and can move up and down; four shock absorbers (11) are welded inside the hollow cylinder (8); A crossbar (10), wherein a screw hole is provided at the left end of the crossbar (10) and a screw hole is provided at the upper portion; the left end of the crossbar (10) is rotatably connected to the buckle (9) through the screw hole, and the upper portion is rotatably connected to the vertical bar (4) through the screw hole; the right portion of the crossbar (10) extends into the hollow cylinder (8) and is welded with four shock absorbers (11); A vertical rod (4), wherein a bolt is provided at the upper end of the vertical rod (4) and a bolt is provided at the lower end; the upper end of the vertical rod (4) is rotatably connected to the button (1) via the bolt, and the lower part of the vertical rod (4) extends into the hollow cylinder (8) and is rotatably connected to the cross rod (10) via a screw hole; A clip (9) is used to hold a pencil, a screw is used to fix the clip, a bolt is provided at the rear and the clip is rotatably connected to the crossbar (10), and the angle of the pencil can be controlled by rotating the connection angle; A spring (3), wherein the spring (3) is wound around the upper portion of the vertical rod (4) and the lower portion of the button (1); A button (1) is provided with a screw hole at the center of the lower portion of the button (1) and is connected to the vertical rod (4).

2. A push-button lead-breaking device for acoustic emission detection technology according to claim 1, characterized in that: The connecting rod (12) is connected to the base (14) through screws and screw holes (13). By connecting different screw holes, the height of the upper part of the device can be adjusted, thereby adjusting the height of the pencil (5). The buckle (9) is rotatably connected to the crossbar (10). By adjusting the rotation connection angle, the angle of the pencil (5) can be adjusted. The buckle (9) uses screws to fix the pencil. The height and angle of the pencil are determined according to the characteristics of the simulated acoustic emission source signal required in the acoustic emission detection test.

3. The push-button lead-breaking device for acoustic emission detection technology according to claim 1, characterized in that: There are eight shock absorbers (11) in total, which are hemispherical and are welded to the inside of the hollow cylinder (8) and the rear of the crossbar (10) respectively, and are used to reduce the contact area between the inside of the hollow cylinder (8) and the crossbar (10) when the key stops, thereby reducing the vibration of the pencil; the corresponding welding positions of the shock absorbers (11) must be aligned.

4. The push-button lead-breaking device for acoustic emission detection technology according to claim 1, characterized in that: The screw bolts for rotationally connecting the button (1) and the vertical rod (4), the screw bolts for rotationally connecting the cross rod (10) and the buckle (9), and the screw bolts for rotationally connecting the buckle (9) and the cross rod (10) are all threadedly connected and fixed to each other by rotation.

Images