Locking type steel wire thread insert vibration test clamp device and vibration test method

Abstract

The invention relates to a locking type steel wire thread insert vibration test clamp device and a vibration test method, which are suitable for vibration examination of a locking type steel wire thread insert in a free state in an aero-engine. The device comprises a clamp base body, a bolt connecting hole, an O-shaped groove and an induction block. The clamp base body is rigidly connected with the electromagnetic vibration table through a bolt, the O-shaped groove is used for installing a steel wire thread insert test piece, the induction block is made of piezoelectric crystal materials, and when the steel wire thread insert vibrates to reach the set amplitude, the induction block is contacted to generate induction current to drive the induction lamp or the ampere meter to display. The test method comprises seven steps of system connection and preparation, parameter setting and starting, vibration amplitude monitoring, amplitude adjustment, assessment state confirmation, vibration assessment execution and test ending. Through a closed-loop control system formed by an external source signal generator and a laser displacement sensor, single-degree-of-freedom fixed-amplitude vibration in a non-resonance state is realized, the amplitude control is accurate, overload is avoided, parallel testing of multiple test pieces is supported, the test efficiency is improved, the method is closer to actual working conditions, and the method has higher engineering application value.

Description

Technical Field

[0001] This invention relates to the field of vibration testing technology for locking wire thread sleeves in aero-engines, specifically to a vibration testing fixture and method for locking wire thread sleeves. Background Technology

[0002] Existing vibration testing methods for aero-engines involve obtaining the resonant frequency of the test specimen through frequency sweeping, then setting conditions such as test amplitude and test cycles to achieve closed-loop control through tracking and dwell. During the test, the system autonomously adjusts the input energy and frequency according to vibration changes to achieve stability throughout the vibration process. These techniques are suitable for vibration testing of blades and other components under fixed conditions. However, vibration testing of locking wire thread sleeves is conducted in a free state. The test specimen itself is not rigidly connected to the tooling, and its vibration frequency is not the resonant frequency in the traditional sense, but rather a normal frequency determined based on the engine's operating conditions. Therefore, traditional vibration fatigue testing equipment and methods cannot meet the vibration testing requirements of locking wire thread sleeves. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a locking type steel wire thread sleeve vibration testing fixture and vibration testing method; the specific technical solution is as follows: A locking type steel wire thread sleeve vibration test fixture device includes a fixture base, bolt connection holes, O-rings and sensing blocks; The fixture base is provided with bolt connection holes, which are used to achieve a rigid connection of the fixture device on the electromagnetic vibration table by engaging with the threaded holes on the electromagnetic vibration table through bolts. The O-groove is set on the fixture base and is used to install the wire thread insert test piece. The size of the O-groove is determined according to the specifications of the wire thread insert to be tested and the measurement requirements. The sensing block is installed on the top of the O-groove. The sensing block is made of piezoelectric crystal material. When the wire thread sleeve vibrates to the set amplitude, it will come into contact with the sensing block, causing the sensing block to generate an induced current. This current can drive the built-in sensing light to display the induced current. When the induced current is generated, the sensing light is lit.

[0004] The preferred embodiment of the locking type wire thread sleeve vibration test fixture device is that the fixture base is provided with multiple O-grooves for simultaneously installing multiple wire thread sleeve test pieces to achieve parallel vibration assessment.

[0005] A vibration testing method for a locking type wire thread sleeve vibration testing fixture, wherein the preferred embodiment includes the following steps: Step 1: System Connection and Preparation; The vibration test fixture is fixed to the electromagnetic vibration table through the bolt connection holes to ensure a rigid connection; the wire thread sleeve test piece is installed into the O-groove of the fixture; the test system includes the electromagnetic vibration table, power amplifier, vibration test fixture, laser displacement sensor, computer and external signal generator; Step Two: Parameter Settings and Startup; According to the assessment requirements, set the test parameters of the external signal generator, turn on the electromagnetic vibration table and computer test software, output vibration signal through the external signal generator, amplify it through the power amplifier and drive the electromagnetic vibration table to make the wire thread sleeve generate forced vibration. Step 3: Vibration amplitude monitoring; The vibration amplitude information of the wire thread sleeve is collected in real time by a laser displacement sensor and fed back to the computer for display; Step 4: Amplitude adjustment; Based on the vibration amplitude information displayed on the computer, adjust the excitation voltage of the external signal generator to gradually bring the vibration amplitude closer to the set amplitude; when it is close to the set amplitude, slowly increase the excitation voltage at the lowest speed to avoid vibration overload; Step 5: Confirm assessment status; When the wire thread sleeve vibrates to the set amplitude, it contacts the sensing block, which generates an induced current, which is displayed by an ammeter or a sensor light. When the induced current appears, the voltage adjustment is stopped to confirm that the assessment state has been reached. Step Six: Vibration Test Execution; Maintain the current vibration energy and frequency, start timing and record the number of vibration cycles until the specified number of assessment cycles is reached; Step 7: The experiment ends; After the assessment is completed, stop the electromagnetic vibration table, shut down the testing system, and end the test.

[0006] The preferred embodiment of the vibration test method for the locking type wire thread sleeve vibration test fixture device is as follows: in step four, the process of adjusting the excitation voltage adopts a closed-loop control mode, using the amplitude feedback from the laser displacement sensor as the control basis, and adjusting the output of the external signal generator in real time.

[0007] The preferred embodiment of the vibration test method for the locking type wire thread sleeve vibration test fixture device is that, in step five, the display method of the induced current includes changes in the ammeter value or the illumination of the induction lamp. Beneficial effects

[0008] This invention achieves single-degree-of-freedom constant-amplitude vibration in a non-resonance state through a closed-loop control method using an external signal generator and a laser displacement sensor, filling a gap in experimental technology in this field.

[0009] A laser displacement sensor is used to collect vibration amplitude in real time, combined with computer feedback adjustment, to ensure the accuracy and stability of vibration amplitude control. A piezoelectric crystal sensing block is installed; when the wire thread sleeve vibration reaches the set amplitude, it automatically senses and illuminates an indicator light, providing intuitive amplitude judgment, avoiding vibration overload, and ensuring test safety. The fixture design has multiple mounting positions, allowing for the simultaneous mounting of multiple wire thread sleeve test pieces, supporting parallel vibration testing, and significantly improving test efficiency. The fixture is rigidly connected to the vibration table via bolts, making installation simple, reliable, and facilitating reuse and standardized operation.

[0010] The vibration mode designed in this invention is closer to the actual working state of locking wire thread inserts in aero engines, and the test results are more valuable for engineering reference, which helps to improve the reliability and life assessment accuracy of engine components. Attached Figure Description

[0011] Figure 1 A cross-sectional view of a locking type steel wire thread sleeve vibration test fixture device; Figure 2 This is a diagram of the test system.

[0012] In the figure: 1- Fixture base, 2- Bolt connection hole, 3- O-groove, 4- Induction block, 5- Electromagnetic vibration table, 6- Power amplifier, 7- Vibration test fixture, 8- Laser displacement sensor, 9- Computer, 10- External signal generator, 11- Ammeter. Detailed Implementation

[0013] The following is in conjunction with the appendix Figure 1-2 The present invention will be described in detail, but the scope of protection of the present invention is not limited by the accompanying drawings.

[0014] A locking type steel wire thread sleeve vibration test fixture device, the vibration test fixture 7 includes a fixture base 1, bolt connection hole 2, O-groove 3 and sensing block 4; The fixture base 1 is provided with bolt connection holes 2, which are used to achieve a rigid connection of the fixture device on the electromagnetic vibration table 5 by means of bolts engaging with threaded holes on the electromagnetic vibration table. The O-groove 3 is set on the fixture base 1 and is used to install the wire thread insert test piece. The size of the O-groove 3 is determined according to the specifications of the wire thread insert to be tested and the measurement requirements. The sensing block 4 is installed on the top of the O-groove 3. The sensing block 4 is made of piezoelectric crystal material. When the wire thread sleeve vibrates to the set amplitude, it will come into contact with the sensing block, causing the sensing block to generate an induced current. This current can drive the built-in sensing lamp to display the induced current. When the induced current is generated, the sensing lamp lights up.

[0015] The fixture base 1 is provided with multiple O-grooves 3 for simultaneously mounting multiple wire threaded test pieces to achieve parallel vibration testing.

[0016] A vibration testing method for a locking type wire thread sleeve vibration testing fixture includes the following steps: Step 1: System Connection and Preparation; The vibration test fixture is fixed to the electromagnetic vibration table 5 through the bolt connection holes to ensure a rigid connection; the wire thread sleeve test piece is installed into the O-groove 3 of the fixture; the test system is connected, which includes the electromagnetic vibration table 5, the power amplifier 6, the vibration test fixture 7, the laser displacement sensor 8, the computer 9, and the external signal generator 10. Turn on the computer and start the test software. Complete the test equipment parameters, including setting the initial reference value of the vibration frequency. At the same time, check the connection status between each device to ensure that the system is running normally. Step Two: Parameter Settings and Startup; According to the assessment requirements, set the test parameters of the external signal generator 10, turn on the electromagnetic vibration table 5 and the computer test software, output the vibration signal through the external signal generator 10, and drive the electromagnetic vibration table 5 after being amplified by the power amplifier 6. The locking wire thread insert test piece to be tested is installed into the O-groove of the vibration test fixture according to the installation specifications, ensuring that there is no abnormal jamming between the test piece and the inner wall of the O-groove, and that the positioning is stable. Step 3: Vibration amplitude monitoring; Standard bolts are used to pass through the bolt holes of the vibration test fixture, and the vibration test fixture is fastened to the threaded hole on the table of the electromagnetic vibration table. The connection torque is checked with a torque wrench to ensure that the two are rigidly connected without any loose gaps. The vibration amplitude information of the wire thread sleeve is collected in real time by the laser displacement sensor 8 and fed back to the computer 9 for display. Step 4: Amplitude adjustment; According to the test requirements, the vibration frequency parameters of the external signal generator, i.e., the test frequency of the locking wire thread insert, are set. The electromagnetic vibration table is turned on, and the gain of the power amplifier is adjusted to the maximum level. Then, the output voltage of the external signal generator is gradually adjusted so that the vibration signal output by the external signal generator is amplified by the power amplifier and transmitted to the electromagnetic vibration table, driving the electromagnetic vibration table to drive the vibration test fixture and the locking wire thread insert test piece on it to generate forced vibration at the test frequency. During this process, the laser displacement sensor collects the vibration amplitude information of the locking wire thread insert test piece in real time and feeds the information back to the computer. Based on the vibration amplitude information displayed on the computer, the excitation voltage of the external signal generator is adjusted so that the vibration amplitude gradually approaches the set amplitude. When approaching the set amplitude, the excitation voltage is slowly increased at the lowest speed to avoid vibration overload. Step 5: Confirm assessment status; Based on the real-time vibration amplitude displayed on the computer 9, adjust the adjustment speed of the output voltage of the external signal generator 10; when the difference between the real-time vibration amplitude and the test-set vibration amplitude is less than the preset threshold, switch to the lowest adjustment speed to slowly increase the output voltage to prevent vibration overload due to excessive voltage adjustment. When the wire thread sleeve vibrates to the set amplitude, it contacts the sensing block 4, which generates an induced current, which is displayed by the ammeter 11 or the sensor light. When the induced current appears, the voltage adjustment is stopped to confirm that the assessment state has been reached. Step Six: Vibration Test Execution; Continuously monitor the changes in the value of ammeter 11. When ammeter 11 displays the induced current value, it indicates that the locking type wire thread sleeve test piece has vibrated to the specified test amplitude. At this time, immediately stop adjusting the output voltage of the external signal generator 10 and start the timing function of computer 9. Maintain the current vibration energy and frequency, start timing and record the number of vibration cycles until the specified test cycle number is reached. Step 7: The experiment ends; When the number of test cycles corresponding to the test duration displayed by the computer reaches the value specified in the task book, first turn off the electromagnetic vibration table 5, then turn off the power amplifier, external signal generator and computer in sequence according to the equipment operation procedure, and finally remove the locking type wire thread sleeve test piece in the O-groove to complete the entire test process.

Claims

1. A locking type steel wire sleeve vibration test jig device, characterized by, It comprises a clamp base, bolt connection holes, O-shaped grooves and an induction block. The clamp base is provided with bolt connection holes for cooperation with threaded holes on the electromagnetic vibration table through bolts to realize rigid connection of the clamp device on the electromagnetic vibration table. The O-shaped grooves are arranged on the clamp base for mounting steel wire sleeve test pieces, wherein the size of the O-shaped grooves is determined according to the size and measurement requirements of the measured steel wire sleeve. The induction block is installed on the top of the O-shaped groove, and the induction block is made of piezoelectric crystal material. When the vibration of the steel wire sleeve reaches the set amplitude, it will contact the induction block, causing the induction block to generate an induced current. The current can drive the built-in induction lamp to display the induced current. When the induced current is generated, the induction lamp is lit.

2. A vibration test fixture for locking-type steel wire inserts according to claim 1, characterized in that The clamp base is provided with a plurality of O-shaped grooves for simultaneously mounting a plurality of steel wire sleeve test pieces to realize parallel vibration test.

3. A method of vibration testing a locking type steel wire insert vibration test fixture apparatus according to any one of claims 1-2, characterized in that, It comprises the following steps: Step one: system connection and preparation; The vibration test clamp is fixed to the electromagnetic vibration table through the bolt connection holes to ensure rigid connection; the steel wire sleeve test piece is installed in the O-shaped groove of the clamp; the test system is connected, which comprises an electromagnetic vibration table, a power amplifier, a vibration test clamp, a laser displacement sensor, a computer and an external signal generator; Step two: parameter setting and starting; According to the test parameters of the external signal generator, the electromagnetic vibration table and the computer test software are started, the vibration signal is output through the external signal generator, amplified by the power amplifier and then drives the electromagnetic vibration table to make the steel wire sleeve produce forced vibration; Step three: vibration amplitude monitoring; The vibration amplitude information of the steel wire sleeve is collected in real time by the laser displacement sensor and fed back to the computer display; Step four: amplitude adjustment; According to the vibration amplitude information displayed by the computer, the excitation voltage of the external signal generator is adjusted to gradually approach the set amplitude; when approaching the set amplitude, the excitation voltage is slowly increased at the lowest speed to avoid vibration overload; Step five: confirmation of test state; When the vibration of the steel wire sleeve reaches the set amplitude, it contacts the induction block, the induction block generates an induced current, and the current is displayed through an ammeter or an induction lamp; when the induced current appears, stop adjusting the voltage and confirm that the test state has been reached; Step six: vibration test execution; The current vibration energy and frequency are maintained, the timing is started and the vibration cycle number is recorded until the specified test cycle number is reached; Step seven: test completion; After the test is completed, the electromagnetic vibration table is stopped, the test system is turned off and the test is ended.

4. A vibration test method of a locking type steel wire screw vibration test jig device according to claim 3, characterized in that, In step four, the process of adjusting the excitation voltage adopts a closed-loop control mode, and the amplitude feedback by the laser displacement sensor is used as the control basis to adjust the output of the external signal generator in real time.

5. The vibration test method of the locking type steel wire screw vibration test jig device according to claim 1, characterized in that, In step five, the display mode of the induced current includes the change of ammeter value or the lighting of the induction lamp.

Images