A sensing part thermal vibration combined loading testing machine

Abstract

The present application belongs to the field of engine test technology, and specifically relates to a thermal vibration combined loading test machine for a sensing part. The test machine includes a vibration control and temperature acquisition system (1), which has a vibration table; a test fixture (2), which is fixed on the vibration table; a displacement mechanism (4), which includes a main frame located on both sides of the vibration table, the main frame is provided with a crossbeam above the vibration table, a lifting mechanism that moves up and down is provided on the crossbeam, and a rotation mechanism is provided at the bottom end of the lifting mechanism; a heating system (3), which is fixed on the rotation mechanism, and the heating system has a cylinder, and a coaxial heating chamber is provided in the cylinder; one end of the sensing part is clamped on the test fixture, and the other end extends into the heating chamber. The present application can realize the superposition of vibration loads and thermal loads in the three axial directions of the sensing part, realize different test conditions of high-temperature vibration combination test, and can monitor the temperature measurement function of the total temperature sensing part in real time during the test.

Description

Technical Field

[0001] The present application belongs to the technical field of engine testing, and in particular relates to a sensing part thermal vibration combined loading testing machine. Background Art

[0002] A testing machine is an instrument used to verify the quality or performance of a material or product before it is put into use. It primarily tests the physical properties of the material or product. While it directly provides specific environmental and loading conditions, it indirectly supports continuous product innovation, improvement, optimization, and perfection. Broadly speaking, any instrument or device that verifies quality or performance can be called a testing machine.

[0003] As industrial thermal machinery subject to high temperatures, high pressures, and high speeds, aircraft engines and gas turbines are subject to the influence of various harsh factors on their components and accessories. Therefore, before use, key components and accessories must be thoroughly inspected for quality and performance. Blades, a key engine component, have attracted numerous reports on research related to blade testing machines. For example, Chinese invention patents with application numbers 201310073338.5 and 201310121074.6 propose non-contact vibration testing and room-temperature vibration fatigue testing of blades. Chinese patents with application numbers 201610066802.1, 201810223573.9, 201821864222.8, and 201910263228.2 have also proposed devices and methods for high-temperature vibration testing of blades. These patents, each with its own unique characteristics, demonstrate a trend of continuous improvement. In addition to the aforementioned patent research, Zhang Dongming, Liu Enjie, and others have also published an academic research paper titled "A New Method for High-Temperature Vibration Fatigue Testing of Aircraft Engine Turbine Blades." This demonstrates the close relationship between key engine components and the two factors influencing them, high temperature and vibration, inherent to the engine itself. However, there are currently relatively few reports on testing equipment and devices for key engine components other than blades.

[0004] Most engine test sensing parts are inserted directly into the flow path from outside the engine casing. These sensing parts are constantly subjected to harsh environments such as high temperature and vibration. Their cantilevered operating position is crucial to the safe operation of the engine. Therefore, an auxiliary component like the sensing part, which has a very high impact on engine safety, must undergo product evaluation simulating actual service conditions before a definitive installation decision can be made. Currently, only one Chinese invention patent, application number 201810099010.3, specifically describes a room-temperature vibration fatigue test device for aircraft engine sensing parts, but it can only perform fatigue tests under room temperature conditions. However, the operating temperature of most sensing parts is above 200°C, and some high-temperature sensing parts exceed 800°C. Currently, the operating temperature of the test sensing parts in the turbine position can reach up to 1200°C. Therefore, fatigue test results under room temperature conditions cannot represent the actual service environment of the sensing part. Chinese invention patent application number 201310105402.3 provides an aircraft engine compressor blade fatigue cycle test device that includes a high-frequency vibration loading component to simulate the high-frequency loads experienced by aircraft engine compressor blades during operation. Patent application number 201810188344.8, while providing a high-temperature vibration fatigue test solution, tests on specially prepared material specimens and cannot be performed directly on the affected part. Patent number 201820163860.0, while proposing a comprehensive multifunctional testing machine, lacks detailed description and is not practical. Therefore, it is necessary to invent a combined thermal vibration and loading testing machine suitable for testing affected parts. Summary of the Invention

[0005] In order to solve one of the above problems, the present application provides a sensing part thermal vibration combined loading testing machine, which mainly includes:

[0006] A vibration control and temperature acquisition system having a vibration table;

[0007] a test fixture, fixed to the vibration table;

[0008] A displacement mechanism comprising a main frame located on both sides of the vibration table, a crossbeam being provided above the vibration table, a lifting mechanism being provided on the crossbeam for vertical movement, a rotating mechanism being provided at the bottom end of the lifting mechanism, the rotating mechanism being capable of being driven to rotate around a rotating shaft fixed at the bottom end of the lifting mechanism;

[0009] A heating system is fixed on the rotating mechanism, wherein the heating system comprises a cylinder, and a heating chamber coaxial with the cylinder is provided in the cylinder;

[0010] One end of the sensing part is clamped on the test fixture, and the other end extends into the heating chamber.

[0011] Preferably, the vibration control and temperature acquisition system further includes an electrical cabinet and a host computer, wherein the electrical cabinet is connected to the vibration table for providing vibration force to the vibration table, and the host computer is electrically connected to the sensing part for receiving the temperature value of the measuring point of the sensing part.

[0012] Preferably, the bottom end of the main frame is provided with a universal wheel that can be moved and locked.

[0013] Preferably, a vibration sensor is fixed on the test fixture.

[0014] Preferably, an entrance hole is further provided on the side wall of the cylinder of the heating system, and the entrance hole is connected to the heating chamber. A laser displacement sensor is fixed on the rotating mechanism. When the working end of the sensing part extends into the heating chamber, the working end of the sensing part can be sensed by the laser displacement sensor through the entrance hole.

[0015] Preferably, the laser displacement sensor is a blue light laser displacement sensor.

[0016] Preferably, the sensing part thermal vibration combined loading testing machine also includes a high temperature protection system, the high temperature protection system includes a cold air injection mechanism, the cold air injection mechanism includes a fixed end and a cold air injection end, the fixed end is fixed on the main frame, and the cold air injection end is directed toward the clamping position of the quasi-sensing part and the test fixture.

[0017] Preferably, the high temperature protection system further comprises a high temperature resistant transparent material and a high temperature resistant heat insulating material, the high temperature resistant transparent material is arranged in the incident hole, and the high temperature resistant heat insulating material is arranged between the test fixture and the vibration table.

[0018] The key points of this application are:

[0019] (1) The displacement mechanism 4 drives the heating system 3 to rotate through the rotation mechanism 4-3, thereby realizing the superposition of multiple axial vibration and heating loads on the test object;

[0020] (2) The design of the combined thermal and vibration loading of the test part by this combined test machine not only conforms to the actual installation of the test object, but also helps to cool and protect the tail of the test object to prevent burning;

[0021] (3) The testing machine can detect the functional integrity of the test object in real time during the test;

[0022] (4) The high temperature protection system of the testing machine can not only protect the tail of the test object, but also protect equipment such as laser displacement sensors and vibration tables.

[0023] Advantages of this application include:

[0024] (1) The testing machine can realize the superposition of vibration load and thermal load in the three axes of the sensing part, and realize different conditions of high temperature vibration combination test;

[0025] (2) The testing machine simulates the fixed method of the sensing part in service to perform test clamping, so that the test results are closer to and reflect the actual situation;

[0026] (3) The testing machine can prevent the tail of the sensing part, the sensor and the vibration table from being damaged by heat while carrying out high-temperature tests at 1200°C, thus ensuring the integrity of the test object and equipment;

[0027] (4) The testing machine can monitor and record the working status of the temperature sensing part in real time during the thermal vibration test, which is convenient for testing the working reliability of the sensing part. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the horizontal state of a preferred embodiment of the sensing part thermal vibration combined loading testing machine of the present application.

[0029] Figure 2 For this application Figure 1 A partially enlarged schematic diagram of the heating system and surrounding structures of the illustrated embodiment.

[0030] Figure 3 This is a schematic diagram of the vertical state of another preferred embodiment of the sensing part thermal vibration combined loading testing machine of the present application.

[0031] Among them, 1 is the vibration control and temperature acquisition system, 1-1 is the vibration table, 1-2 is the electrical cabinet, 1-3 is the host computer, 2 is the test fixture, 3 is the heating system, 3-1 is the heating chamber, 3-2 is the incident hole, 4 is the displacement mechanism, 4-1 is the main frame, 4-2 is the lifting mechanism, 4-3 is the rotation mechanism, 5 is the high-temperature protection system, 5-1 is the cold air injection mechanism, 5-2 is the high-temperature resistant transparent material, 5-3 is the high-temperature resistant thermal insulation material, 6 is the laser displacement sensor, 7 is the vibration sensor, and 8 is the sensing part. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the implementation of this application will be described in more detail below in conjunction with the drawings in the implementation of this application. In the drawings, the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The described implementation is a part of the implementation of this application, not all of the implementations. The implementation described below with reference to the drawings is exemplary and is intended to be used to explain this application, and should not be understood as a limitation on this application. Based on the implementation in this application, all other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The implementation of this application is described in detail below in conjunction with the drawings.

[0033] This application provides a sensing part thermal vibration combined loading testing machine, which is specifically designed to meet the needs of high-temperature vibration fatigue testing and high-temperature vibration environment testing of long rod-shaped sensing parts: multi-axial thermal vibration combined loading of the sensing part, cantilever clamping and fixing during the test, and a maximum working end test temperature of 1200°C. At the same time, the testing machine can also prevent the tail of the sensing part from being damaged by overburning and complete real-time monitoring of the working status of the temperature measuring point. Figure 1-Figure 3 As shown in the figure, the testing machine mainly includes:

[0034] A vibration control and temperature acquisition system 1, comprising a vibration table 1-1;

[0035] A test fixture 2, fixed on the vibration table 1-1;

[0036] The displacement mechanism 4 includes a main frame 4-1 located on both sides of the vibration table 1-1. The main frame 4-1 is provided with a crossbeam above the vibration table 1-1. The crossbeam is provided with a lifting mechanism 4-2 that moves up and down. The bottom end of the lifting mechanism 4-2 is provided with a rotating mechanism 4-3. The rotating mechanism 4-3 can be driven to rotate around a rotating shaft fixed to the bottom end of the lifting mechanism 4-2;

[0037] A heating system 3 is fixed on the rotating mechanism 4-3, and the heating system comprises a cylinder, wherein the cylinder comprises a heating chamber 3-1 coaxial with the cylinder;

[0038] One end of the sensing portion 8 is clamped on the test fixture 2, and the other end extends into the heating chamber 3-1.

[0039] In some optional embodiments, the bottom end of the main frame 4-1 is provided with universal wheels that can be moved and locked.

[0040] The heating system 3 of the present application is fixed on the rotating mechanism 4-3, and the base of the main frame 4-1 can be freely moved and locked. Through the cooperation of the main frame 4-1, the lifting mechanism 4-2 and the rotating mechanism 4-3, the heating system 3 can be translated, rotated, ascended and descended, so that the sensing part 8 is centered in the heating chamber 3-1, and the like is used in conjunction with the above. Figure 1 or Figure 3 The different styles of specimen fixtures 2 shown can realize thermal vibration combined loading in different axial directions.

[0041] The rotating mechanism 4-3 of the present application mainly drives the heating system 3 to rotate, for example Figure 1 The horizontal rotation of the cylinder of the middle heating system 3 is Figure 3 The vertical direction shown, or by Figure 3 The vertical rotation shown is Figure 1 As shown in the horizontal direction, it can be understood that the rotation axis is generally parallel to the beam, so that the heating system rotates around the rotation axis in the vertical plane. Figure 1 In the embodiment shown, since the sensing part is placed horizontally, the rotating mechanism 4-3 drives the heating system to rotate until the cylinder axis of the heating system is in the horizontal direction, and the sensing part 8 is inserted horizontally into the heating cavity 3-1 of the heating system. Figure 3 In the embodiment shown, since the sensing part is placed vertically, the rotating mechanism 4-3 drives the heating system to rotate until the cylinder axis of the heating system is located in the vertical direction, and the sensing part 8 is vertically inserted into the heating chamber 3-1 of the heating system.

[0042] In some optional embodiments, the vibration control and temperature acquisition system 1 further includes an electrical cabinet 1-2 and a host computer 1-3. The electrical cabinet 1-2 is connected to the vibration table 1-1 to provide a vibration force to the vibration table 1-1. The host computer 1-3 is electrically connected to the sensing portion 8 to receive the temperature value of the measuring point of the sensing portion 8. In this embodiment, during the high-temperature test, the vibration control and acquisition system 1 drives and controls the vibration table 1-1 through the host computer 1-3 and the electrical cabinet 1-2. At the same time, the host computer 1-3 also monitors and records the temperature value of the measuring point of the temperature sensing portion in real time.

[0043] In some optional embodiments, a vibration sensor 7 is fixed on the test fixture 2 .

[0044] In some optional embodiments, an entrance hole 3-2 is further provided on the side wall of the cylinder of the heating system 3, and the entrance hole 3-2 is connected to the heating chamber 3-1. A laser displacement sensor 6 is fixed on the rotating mechanism 4-3. When the working end of the sensing part 8 extends into the heating chamber 3-1, the working end of the sensing part 8 can be sensed by the laser displacement sensor 6 through the entrance hole 3-2.

[0045] In some optional implementations, the laser displacement sensor 6 is a blue light laser displacement sensor.

[0046] In the above embodiment, the laser displacement sensor 6 is fixed to the rotating mechanism 4-3, facing the working end of the sensing portion 8 through the incident hole 3-2. The vibration sensor 7 is fixed to the specimen fixture 2, close to the sensing portion 8. The sensing portion 8 is clamped in the same manner as it is fixed to the engine, keeping the working end of the sensing portion 8 within the heating chamber 3-1 to simulate a real-world service environment and subject the sensing portion 8 to thermal vibration loading. The laser displacement sensor 6 monitors the amplitude and frequency of the working end, and the vibration sensor 7 is used to adjust the actual excitation input of the vibration table 1-1 to the sensing portion 8.

[0047] In some optional embodiments, the sensing part thermal vibration combined loading testing machine also includes a high temperature protection system 5, the high temperature protection system 5 includes a cold air injection mechanism 5-1, the cold air injection mechanism 5-1 includes a fixed end and a cold air injection end, the fixed end is fixed on the main frame 4-1, and the cold air injection end is directed toward the clamping position of the quasi-sensing part 8 and the test fixture 2.

[0048] In some optional embodiments, the high temperature protection system 5 further includes a high temperature resistant transparent material 5-2 and a high temperature resistant heat insulating material 5-3, wherein the high temperature resistant transparent material 5-2 is arranged in the incident hole 3-2, and the high temperature resistant heat insulating material 5-3 is arranged between the test fixture 2 and the vibration table 1-1.

[0049] It should also be noted that the material of the specimen fixture 2 of the present application is a high-temperature resistant alloy material.

[0050] This application provides a testing machine capable of combined thermal vibration loading for testing the sensitive part of aircraft engines and gas turbines, which meets the test needs of high-temperature vibration fatigue and high-temperature vibration environment of the sensitive part, so as to inspect the quality of the sensitive part and evaluate its service life. The way the testing machine clamps the test object - the sensitive part is consistent with its fixed method in service (installed on the engine). At the same time, the testing machine can also meet the test needs of the combination of three-axial vibration loading and thermal load on the sensitive part. While the testing machine performs a combined thermal vibration loading test on the sensitive part, it can also perform real-time status monitoring of the total temperature sensitive part during the test.

[0051] Although the present application has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made based on the present application. Therefore, such modifications or improvements, which do not depart from the spirit of the present application, are within the scope of protection claimed in the present application.

Claims

1. A thermal vibration combined loading testing machine for a sensitive part, characterized in that: include: A vibration control and temperature acquisition system (1) comprising a vibration table (1-1); A test fixture (2) fixed on the vibration table (1-1); A displacement mechanism (4) comprising a main frame (4-1) located on both sides of the vibration table (1-1), the main frame (4-1) being provided with a crossbeam above the vibration table (1-1), a lifting mechanism (4-2) being provided on the crossbeam and being capable of being moved up and down, a rotating mechanism (4-3) being provided at the bottom end of the lifting mechanism (4-2), and the rotating mechanism (4-3) being capable of being driven to rotate around a rotating shaft fixed at the bottom end of the lifting mechanism (4-2); A heating system (3) is fixed on the rotating mechanism (4-3), wherein the heating system comprises a cylinder, and a heating chamber (3-1) coaxial with the cylinder is provided in the cylinder; One end of the sensing portion (8) is clamped on the test fixture (2), and the other end extends into the heating chamber (3-1).

2. The sensitive part thermal vibration combined loading testing machine according to claim 1, characterized in that: The vibration control and temperature acquisition system (1) further comprises an electrical cabinet (1-2) and a host computer (1-3); the electrical cabinet (1-2) is connected to the vibration table (1-1) and is used to provide vibration force to the vibration table (1-1); the host computer (1-3) is electrically connected to the sensing part (8) and is used to receive the temperature value of the measuring point of the sensing part (8).

3. The sensitive part thermal vibration combined loading testing machine according to claim 1, characterized in that: The bottom end of the main frame (4-1) is provided with a universal wheel that can be moved and locked.

4. The sensing part thermal vibration combined loading testing machine according to claim 1, characterized in that: A vibration sensor (7) is fixed on the test fixture (2).

5. The sensitive part thermal vibration combined loading testing machine according to claim 1, characterized in that: An inlet hole (3-2) is also provided on the side wall of the cylinder of the heating system (3), and the inlet hole (3-2) is connected to the heating chamber (3-1). A laser displacement sensor (6) is fixed on the rotating mechanism (4-3). When the working end of the sensing part (8) extends into the heating chamber (3-1), the working end of the sensing part (8) can be sensed by the laser displacement sensor (6) through the inlet hole (3-2).

6. The sensing part thermal vibration combined loading testing machine according to claim 5, characterized in that: The laser displacement sensor (6) is a blue light laser displacement sensor.

7. The sensitive part thermal vibration combined loading testing machine according to claim 5, characterized in that: The sensing part thermal vibration combined loading tester further comprises a high temperature protection system (5), the high temperature protection system (5) comprises a cold air injection mechanism (5-1), the cold air injection mechanism (5-1) comprises a fixed end and a cold air injection end, the fixed end is fixed on the main frame (4-1), and the cold air injection end faces the clamping position of the sensing part (8) and the test fixture (2).

8. The sensing part thermal vibration combined loading testing machine according to claim 7, characterized in that: The high-temperature protection system (5) further comprises a high-temperature resistant transparent material (5-2) and a high-temperature resistant heat-insulating material (5-3); the high-temperature resistant transparent material (5-2) is arranged in the incident hole (3-2); and the high-temperature resistant heat-insulating material (5-3) is arranged between the test fixture (2) and the vibration table (1-1).

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