Special device for acoustic emission detection in high-temperature tensile test of round-rod-shaped sample
By designing a special device for acoustic emission detection for high-temperature tensile test of round rod-shaped specimens, the sensor and sample are coupled using the upper and lower rod structures and connection structures, the difficulty in coupling of round rod-shaped specimens at high temperatures is solved. The problem is that efficient and safe acoustic emission detection is achieved.
Patent Information
- Application Number
- CN202420699178.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-07
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-04-07
AI Technical Summary
In high-temperature tensile test, the round rod-like sample is difficult to fully couple with the sensor, and the space in the heating furnace is small, making it difficult to install waveguide rods, resulting in poor acoustic emission detection effect.
Design a special device for high-temperature tensile test acoustic emission detection of round rod specimens, adopting a pull-up rod and a pull-up rod structure, and fixing the sensor with the pull-up rod through a connecting structure. The outer wall of the pull-up rod is equipped with a coupling surface, a bracket, a screw, and a connecting seat The connection structure composed of the adjustment knob ensures that the sensor and the coupling surface are fully coupled.
It realizes that the acoustic emission signals can be collected without welding waveguide rods in high-temperature tensile tests, which simplifies operation, improves detection efficiency and safety, and reduces test costs.
Smart Images
Figure CN222461187U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of acoustic emission detection, in particular to a special device for acoustic emission detection of a round rod-shaped sample during a high-temperature tensile test. Background Art
[0002] When materials are deformed and cracks propagate, elastic waves will occur, a phenomenon called acoustic emission. The related detection using the acoustic emission phenomenon of materials is called acoustic emission detection, which is widely used in daily inspection and online monitoring of special equipment (such as pressure vessels, cranes and amusement facilities, etc.). At the same time, acoustic emission is also widely used in the tensile and fatigue research of metal materials.
[0003] The elastic waves emitted by the acoustic emission source are received by the sensor and converted into electrical signals, which are then recorded and processed by the computer. The full coupling between the sensor and the tensile sample is the key to whether the test can proceed smoothly. Generally speaking, sheet samples are easy to couple, while round rod samples are difficult to fully couple with the sensor. In addition, the temperature of the high-temperature tensile test is high and cannot be directly coupled. Therefore, the coupling in the form of a waveguide rod is considered under high temperature conditions. However, the space in the high-temperature tensile test heating furnace is small, and it is not easy to install the waveguide rod. It is also difficult to weld the waveguide rod to the round rod tensile sample itself. The welding process may affect the performance of the sample. Therefore, it is considered to design an easy-to-use high-temperature tensile test acoustic emission detection device. Utility Model Content
[0004] The utility model aims to overcome the deficiencies in the above-mentioned background technology and to provide a special device for acoustic emission detection of round rod-shaped specimens during high-temperature tensile tests, which should be easy to operate and have good collection effects.
[0005] The technical solution of the utility model is:
[0006] A special device for acoustic emission detection of round rod-shaped specimens during high-temperature tensile tests, characterized in that the device comprises an upper pull rod and a lower pull rod respectively installed at both ends of the specimen and a sensor fixed to the lower pull rod through a connecting structure; the outer wall of the lower pull rod is provided with a coupling surface for matching the sensor.
[0007] The connection structure comprises a bracket fixed to the lower pull rod and provided with a screw hole, a screw rod passing through the screw hole, and a connection seat and an adjusting knob arranged at both ends of the screw rod.
[0008] The sensor is fixed to the connecting seat, and the screw rod is perpendicular to the coupling surface.
[0009] The first bracket rod of the bracket is provided with the screw hole, and the second bracket rod of the bracket is fixed to the lower pull rod.
[0010] The outer wall of the lower pull rod is also provided with a mounting surface, and the second bracket rod of the bracket is fixed to the mounting surface by a fastener.
[0011] The upper pull rod is installed at the top of the sample through an upper thread structure; the lower pull rod is installed at the bottom of the sample through a lower thread structure.
[0012] The beneficial effects of the utility model are:
[0013] The utility model has a simple structure and is easy to operate. It can realize the collection of acoustic emission signals during the high-temperature tensile test without welding waveguide rods, thereby performing characteristic analysis of the acoustic emission signals during the high-temperature tensile test of the material. The entire detection process is more efficient and safe, which can improve the test efficiency and save related costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.
[0015] Figure 2 It is a three-dimensional structural schematic diagram of the upper pull rod of the utility model.
[0016] Figure 3 It is one of the three-dimensional structural schematic diagrams of the lower pull rod of the utility model.
[0017] Figure 4 This is the second three-dimensional structural schematic diagram of the lower pull rod of the utility model.
[0018] Figure 5 It is a three-dimensional structural schematic diagram of the connection structure of the utility model.
[0019] Figure 6 It is a schematic diagram of the connection relationship between the sensor and the connecting socket of the utility model.
[0020] Figure 7 It is a schematic diagram of an embodiment.
[0021] Figure 8 yes Figure 6 Schematic diagram of the cross-sectional structure.
[0022] Reference numerals:
[0023] Upper pull rod 1, upper pull rod hole 1-1, lower pull rod 2, lower pull rod hole 2-1, sensor 3, bracket 4, first bracket rod 4-1, second bracket rod 4-2, third bracket rod 4-3, fastener 4-4, screw 5, connecting seat 6, groove 6-1, adjusting knob 7, sample 10, heating furnace 11, coupling surface A, installation surface B. DETAILED DESCRIPTION
[0024] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0025] As Figure 1 shown, a special device for acoustic emission detection of high-temperature tensile test of round bar specimens includes an upper pull rod 1, a lower pull rod 2, a connection structure, and a sensor 3. The upper pull rod 1 and the lower pull rod 2 are respectively installed at both ends of the specimen 10. The sensor is fixed to the lower pull rod through the connection structure.
[0026] The upper pull rod, the specimen, and the lower pull rod are axially connected in sequence from top to bottom. The specimen is round bar-shaped. The upper pull rod is installed at the top end of the specimen through an upper thread structure, and the lower pull rod is installed at the bottom end of the specimen through a lower thread structure. External threads are processed at both ends of the specimen. The upper thread structure includes the external thread provided at the top end of the specimen and the upper pull rod hole 1-1 provided at the bottom end of the upper pull rod and having an internal thread. The lower thread structure includes the external thread provided at the bottom end of the specimen and the lower pull rod hole 2-1 provided at the top end of the lower pull rod and having an internal thread. The upper pull rod 1 and the lower pull rod are made of Incol718 alloy, or other high-temperature alloys can also be used.
[0027] Two planes are provided on the outer wall of the lower pull rod, including a coupling surface A and a mounting surface B. These two planes are parallel to each other and symmetrically arranged about the central axis of the lower pull rod. The coupling surface is used to cooperate with the sensor to work, and the mounting surface is used to fix the connection structure. The symmetrically arranged coupling surface A and mounting surface B can ensure uniform stress and structural stability.
[0028] The connection structure includes a bracket 4, a screw 5, a connection seat 6, and an adjustment knob 7. The bracket is in a U-shape, including a first bracket rod 4-1 and a second bracket rod 4-2 arranged in parallel and a third bracket rod 4-3 vertically connecting the first bracket rod and the second bracket rod. A screw hole (omitted in the figure) is made on the first bracket rod, and the second bracket rod of the bracket is fixed to the mounting surface through fasteners 4-4 (two screws).
[0029] The screw engages with the screw hole and passes through the first bracket rod. The screw is perpendicular to the coupling surface. A connection seat is provided at the front end (the end close to the coupling surface) of the screw, and an adjustment knob is provided at the rear end (the end far from the coupling surface) of the screw.
[0030] The sensor is fixed to the connection seat. A groove 6-1 is provided on the end face of the connection seat. The depth of the groove is 1.5 to 2.5 mm (preferably 2 mm). The inner diameter of the groove is suitable for the outer diameter of the sensor. The rear end of the sensor is snapped into the groove to be fixed to the connection seat. Other methods can also be used to fix the sensor to the connection seat. The sensor is electrically connected to an external controller through a signal line.
[0031] Since the utility model is used for high temperature tensile test, during the test, heat tends to flow upwards, and the temperature of the lower tie rod is lower than that of the upper tie rod, so the coupling surface of the sensor is processed on the lower tie rod to create a suitable temperature for the normal operation of the sensor. At present, general sensors can be used normally below 150°C. In fact, before coupling the sensor with the plane, it is necessary to confirm that the temperature of the plane is lower than the upper limit of the normal operating temperature.
[0032] The method of using the utility model is:
[0033] 1. Before the test, install the upper and lower rods at both ends of the specimen respectively, and load a certain preload (axial stretching at both ends) on the upper and lower rods to eliminate the gaps between the components to eliminate noise, and at the same time ensure that the specimen is fully coupled with the upper and lower rods.
[0034] 2. During the test, if Figure 6 and Figure 7 As shown, the sample is placed in a heating furnace 11 for heating. During the heating process, the sensor may not be loaded. After reaching the preset temperature, the sample is ensured to be in a certain preload state. At the same time, the temperature of the coupling surface of the lower pull rod is measured. After confirming that it is lower than the normal working temperature of the sensor, the sensor is installed (the sensor is installed in the connecting seat), silicone grease is applied between the sensor and the coupling surface, and the adjustment knob is turned to bring the sensor close to the coupling surface to allow the sensor to be fully coupled to the coupling surface. Finally, after conducting tests on environmental noise, coupling status, attenuation, etc. in accordance with the relevant requirements of acoustic emission detection, the acoustic emission detection of the round rod sample during high-temperature stretching is started.
[0035] The preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.
Claims
1. A special device for acoustic emission detection of round rod-shaped specimens during high-temperature tensile testing, characterized in that: The device comprises an upper pull rod (1) and a lower pull rod (2) respectively mounted at two ends of a sample, and a sensor (3) fixed to the lower pull rod via a connecting structure; the outer wall of the lower pull rod is provided with a coupling surface (A) matching the sensor.
2. The special device for acoustic emission detection of round rod-shaped specimens at high temperature tensile test according to claim 1, characterized in that: The connection structure comprises a bracket (4) fixed to the lower pull rod and provided with a screw hole, a screw rod (5) passing through the screw hole, a connection seat (6) arranged at both ends of the screw rod, and an adjustment knob (7).
3. The special device for acoustic emission detection of round rod-shaped specimens at high temperature tensile test according to claim 2, characterized in that: The sensor is fixed to the connecting seat, and the screw rod is perpendicular to the coupling surface.
4. The special device for acoustic emission detection of round rod-shaped specimens in high temperature tensile test according to claim 3, characterized in that: The first support rod (4-1) of the support is provided with the screw hole, and the second support rod (4-2) of the support is fixed to the lower pull rod.
5. The special device for acoustic emission detection of round rod-shaped specimens in high temperature tensile test according to claim 4, characterized in that: The outer wall of the lower pull rod is also provided with a mounting surface (B), and the second bracket rod of the bracket is fixed to the mounting surface by a fastener.
6. The special device for acoustic emission detection of round rod-shaped specimens in high temperature tensile test according to claim 1 or 5, characterized in that: The upper pull rod is installed at the top of the sample through an upper thread structure; the lower pull rod is installed at the bottom of the sample through a lower thread structure.