Self-excited vibration testing device

Abstract

The invention belongs to the technical field of mechanical part testing, and particularly relates to a self-excited vibration testing device which comprises a vibration excitation module, an excited module and a displacement module. The vibration excitation module comprises a main support, a driver for outputting rotation is installed on the main support, and a driving ring is installed at the output end of the driver; the stimulated module comprises a first lifting mechanism and a workbench, the first lifting mechanism comprises a lifting platform and a lifting driver, and the lifting driver is used for driving the lifting platform to do reciprocating rectilinear motion; the workbench is arranged on the lifting platform, the workbench is rotatably connected with a mounting seat for mounting a to-be-tested part, and a pressure sensor is arranged between the workbench and the mounting seat; the displacement module comprises a displacement support and a non-contact displacement sensor, and the non-contact displacement sensor is installed on the displacement support. The invention provides a test device capable of accurately measuring self-excited vibration parameters of parts and better revealing a vibration mechanism. And the influence of the self-excited vibration on the equipment is further explored.

Description

Technical Field

[0001] The invention belongs to the technical field of testing mechanical parts, and in particular relates to a self-excited vibration testing device. Background Art

[0002] Self-excited vibration is a nonlinear vibration maintained by the excitation generated by the system itself. Unlike free vibration and forced vibration, self-excited vibration can produce stable periodic vibration without external excitation, and its vibration frequency and amplitude are often closely related to the structure and operating conditions of the system.

[0003] For example, in the modern industrial field, sealing components are key devices to prevent fluid leakage. When the equipment in which they are located is running at high speed, they are prone to self-excited vibration. The self-excited vibration of sealing components may be caused by a variety of factors, such as unstable speed, load changes, etc. The impact of self-excited vibration on sealing components may cause wear on the sealing surface and leakage accidents. When the vibration amplitude exceeds a certain threshold, the contact pressure of the sealing surface will change, causing the sealing effect to decrease, and the fluid will easily leak out through the sealing gap under the action of the pressure difference. In addition, self-excited vibration may also lead to failure of the seal, such as breakage and loosening of the sealing ring, further aggravating the leakage problem.

[0004] The frequent occurrence of self-excited vibration in equipment seriously affects the life and safety of the equipment. However, since the components of most equipment that self-excites in actual operation will generate acceleration due to vibration, resulting in changes in displacement and load, these parameters cannot be accurately measured under actual working conditions. Therefore, it is difficult to reveal the mechanism and cause of the self-excited vibration of components by simulation and emulation alone. Summary of the invention

[0005] The present invention aims to provide a self-excited vibration test device, which is a test device that can accurately measure the self-excited vibration parameters of components and better reveal the vibration mechanism; and further explore the impact of self-excited vibration on equipment.

[0006] In order to achieve the above object, the scheme of the present invention is: a self-excited vibration test device, including an excitation module, an excited module and a displacement module:

[0007] The excitation module comprises a main bracket, on which a driver for outputting rotation is mounted, the output end of the driver is arranged downward, and an active ring is mounted on the output end of the driver;

[0008] The stimulated module includes a first lifting mechanism and a workbench, the first lifting mechanism includes a lifting platform and a lifting driver, the lifting driver is used to drive the lifting platform to make reciprocating linear motion; the workbench is arranged on the lifting platform, a mounting seat for mounting the components to be tested is rotatably connected to the workbench, and a pressure sensor is arranged between the workbench and the mounting seat;

[0009] The displacement module comprises a displacement bracket and a non-contact displacement sensor. The non-contact displacement sensor is mounted on the displacement bracket, and the measuring end of the non-contact displacement sensor faces the workbench.

[0010] The working principle and beneficial effects of this solution are as follows: the component to be tested is mounted on the mounting seat, the linear motion of the first lifting mechanism causes the component to be tested to counteract the active ring, the driver simulates the speed condition of the component to be tested, the lifting stroke of the first lifting mechanism is controlled and the indication of the pressure sensor is read to simulate the load borne by the component to be tested, thereby simulating the self-excited vibration condition of the component to be tested. The beating data of the component to be tested under the self-excited vibration condition is detected by a non-contact displacement sensor, thereby measuring the self-excited vibration parameters of the component to be tested under different speeds and loads.

[0011] This solution can simulate the operating conditions of most equipment, and can also simulate working conditions from low speed to high speed, from low load to high load (the load in the engine seal is the installation spring preload). It has wide applicability and strong practicality.

[0012] This solution adopts a modular and separate design. The spacing is adjusted and controlled by the first lifting mechanism. It can also realize the vibration caused by special friction forms such as eccentric friction and non-horizontal friction, thereby greatly restoring the operating conditions of various components, especially sealing components.

[0013] This solution utilizes non-contact displacement sensors, which do not touch the parts to be tested, thus avoiding distortion of working conditions caused by contact with the parts to be tested, and achieving accurate, fast and efficient data.

[0014] By properly arranging pressure sensors, this solution can accurately and quickly measure the load changes caused by self-excited vibration and capture the nonlinear changes of vibration.

[0015] Optionally, the workbench also includes an auxiliary plate, which is arranged between the mounting seat and the pressure sensor, and a triangular support plate is installed on the auxiliary plate, and a torque sensor is installed on the triangular support plate. A torque auxiliary block is provided on the side of the mounting seat, and the auxiliary block can contact the torque sensor when the mounting seat rotates. When the active ring of the excitation module contacts and rotates with the component to be tested, it drives the mounting seat and the component to be tested to rotate, and the torque auxiliary block and the torque sensor, thereby obtaining torque data through the torque sensor, thereby solving the friction force of the component to be tested, so as to accurately measure parameters, and then better reveal the mechanism of vibration and friction aggravation caused by vibration, reveal the influence of self-excited vibration of various components, especially sealing components, under harsh working conditions, and guide the development of its theory and principles, thereby reducing damage to components and extending the life of the equipment.

[0016] Optionally, the displacement module further includes a second lifting mechanism, which is used to drive the displacement bracket to perform reciprocating linear motion, so as to facilitate adjustment of the non-contact displacement sensor according to the needs of different components to be tested, and further facilitate the realization of special friction forms such as eccentric friction and non-horizontal friction.

[0017] Optionally, a three-axis acceleration sensor is installed on the circumference of the mounting seat, so as to collect the acceleration change caused by vibration in real time, and further measure the self-excited vibration parameters of the tested parts under different speeds and loads.

[0018] Optionally, the first lifting mechanism and the second lifting mechanism include one of a linear motor, a pneumatic cylinder, a hydraulic cylinder, an electric cylinder, a lead screw mechanism or a threaded mechanism.

[0019] Optionally, it also includes a slide and a slide seat, the excited module is installed on the slide, the main bracket is installed on the slide seat, and the slide is slidably connected to the slide seat.

[0020] Optionally, the active ring is detachably connected to the driver, so that active rings of different sizes and dimensions can be replaced at any time.

[0021] Optionally, a spring support plate and a spring are further included, wherein the spring support plate is arranged between the mounting seat and the auxiliary plate, the spring is arranged between the spring support plate and the auxiliary plate, and the mounting seat is mounted on the spring support plate. The vibration of the mounting seat and the component to be tested is relatively isolated from the outside world by the spring, reducing the influence of environmental factors on the vibration of the component to be tested, thereby further ensuring the accuracy of the test data.

[0022] Optionally, the component to be tested and the mounting seat are integrally formed.

[0023] Optionally, a metal ring is provided on the coaxial sleeve of the mounting seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a self-excited vibration test device according to an embodiment of the present invention;

[0025] Figure 2 A structural schematic diagram of a self-excited vibration test device from another perspective in an embodiment of the present invention;

[0026] Figure 3 Schematic diagram of the structure of the excited module in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following is further described in detail through specific implementation methods:

[0028] The marks in the drawings of the specification include: excitation module 1, main bracket 11, slide 12, slide seat 13, servo motor 14, active ring 15, excited module 2, first lifting mechanism 21, workbench 22, lifting platform 23, mounting seat 24, metal ring 25, three-axis acceleration sensor 26, pressure sensor 27, torque sensor 28, auxiliary plate 29, spring support plate 210, spring 211, triangular support plate 212, torque auxiliary block 213, displacement module 3, second lifting mechanism 31, displacement bracket 32, non-contact displacement sensor 33.

[0029] Example

[0030] This embodiment is basically Figure 1 , Figure 2 As shown: A self-excited vibration test device is mainly used to measure the self-excited vibration parameters of the end face seal of the rotary engine under actual working conditions. The device includes an excitation module 1, an excited module 2 and a displacement module 3:

[0031] The excitation module 1 includes a main support 11, a slide 12 and a slide seat 13. The main support 11 is a door-shaped structure. An output rotation driver is installed in the middle of the cross frame of the main support 11. In this embodiment, it is a servo motor 14 with a rotation speed of up to 24000r / min, covering the operating speed of most equipment, and can accurately adjust the speed between 1 and 24000r / min. The output shaft of the servo motor 14 is set vertically downward, and the end of the output shaft is detachably mounted with an active ring 15 by screws, so that the active ring 15 of different sizes and dimensions can be replaced at any time.

[0032] The displacement module 3 includes a second lifting mechanism 31, a displacement bracket 32 ​​and a non-contact displacement sensor 33. The non-contact displacement sensor 33 is mounted on the displacement bracket 32, and the measuring end of the non-contact displacement sensor 33 faces the workbench 22. The non-contact displacement sensor 33 detects the beating data of the end face seal under the self-excited vibration condition, thereby measuring the self-excited vibration parameters of the tested parts under different speeds and loads.

[0033] The stimulated module 2 includes a first lifting mechanism 21 and a workbench 22. Figure 3 As shown, the first lifting mechanism 21 includes a lifting platform 23 and a lifting drive. The second lifting mechanism 31 described below the lifting drive is a screw mechanism in this embodiment. In other embodiments, a linear motor, a cylinder, an oil cylinder, an electric cylinder, etc. can also be used as needed. The lifting drive is used to drive the lifting platform 23 to make reciprocating linear motion. The lifting platform 23 is connected to the screw nut of the screw mechanism. The screw in the screw rotates to drive the lifting platform 23 to make reciprocating linear motion up and down. In order to facilitate operation, a rotating wheel and a handle are also installed on the top of the screw.

[0034] The workbench 22 is arranged on the lifting platform 23, and a mounting seat 24 for mounting the components to be tested is rotatably connected to the workbench 22. In this embodiment, since the end face seal is made of ceramic material, the mounting seat 24 and the end face seal to be tested are integrally formed of ceramic material, and a step is formed at the lower part of the mounting seat 24, and a metal ring 25 is coaxially fixed on the step. The function of the metal ring 25 is to better reflect the measurement signal of the non-contact displacement sensor 33. A mounting hole is respectively opened in the four directions of the circumference of the mounting seat 24, and a three-axis acceleration sensor 26 is respectively installed in the mounting holes in three directions. The three three-axis acceleration sensors 26 can collect the acceleration changes caused by vibration in real time, and measure the self-excited vibration parameters of the end face seal under different speeds and loads.

[0035] The workbench 22 also includes an auxiliary plate 29, a spring support plate 210 and a spring 211. The auxiliary plate 29 is arranged below the mounting seat 24. The pressure sensor 27 is arranged below the auxiliary plate 29. The two ends of the pressure sensor 27 connect the workbench 22 and the auxiliary plate 29. A triangular support plate 212 is installed on the auxiliary plate 29. A torque sensor 28 is installed on the triangular support plate 212. A torque auxiliary block 213 is installed on the remaining mounting hole on the side of the mounting seat 24. The auxiliary block can contact the torque sensor 28 when the mounting seat 24 rotates. When the active ring 15 of the excitation module 1 contacts and rotates with the component to be tested, the mounting seat 24 and the component to be tested are driven to rotate, and the torque auxiliary block 213 and the torque sensor 28 are connected, so that the torque data is obtained through the torque sensor 28, so as to solve the friction force of the component to be tested, so as to accurately measure the parameters, and then better reveal the mechanism of vibration and friction aggravation caused by vibration, reveal the influence of self-excited vibration of various components, especially sealing components, under harsh working conditions, and guide the development of its theory and principle, so as to reduce the damage of components and extend the life of the equipment. The spring support plate 210 is arranged between the mounting seat 24 and the auxiliary plate 29, the spring 211 is arranged between the spring support plate 210 and the auxiliary plate 29, and the mounting seat 24 is mounted on the spring support plate 210. The vibration of the mounting seat 24 and the component to be tested is relatively isolated from the outside world by the spring 211, reducing the influence of environmental factors on the vibration of the component to be tested, thereby further ensuring the accuracy of the test data.

[0036] This embodiment is composed of multiple adjustable modules, which can simulate the operation of most equipment, such as low speed to high speed, low load to high load, different installation spring 211 preload and other working conditions. At the same time, through the separate design, the spacing can be controlled to achieve special friction forms such as eccentric friction and non-horizontal friction, which greatly restores the operation of the end face seal. Different sensors are used to achieve accurate, fast and efficient data collection, which helps to further study the friction, self-excited vibration mechanism and the cause of seal failure.

[0037] The above are only embodiments of the present invention. The invention is not limited to the fields involved in this implementation case. The common sense such as the known specific structures and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field to which the invention belongs before the application date or the priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. A self-excited vibration test device, characterized in that: Including excitation module, stimulated module and displacement module: The excitation module comprises a main bracket, on which a driver for outputting rotation is mounted, the output end of the driver is arranged downward, and an active ring is mounted on the output end of the driver; The stimulated module includes a first lifting mechanism and a workbench, the first lifting mechanism includes a lifting platform and a lifting driver, the lifting driver is used to drive the lifting platform to make reciprocating linear motion; the workbench is arranged on the lifting platform, a mounting seat for mounting the components to be tested is rotatably connected to the workbench, and a pressure sensor is arranged between the workbench and the mounting seat; The displacement module comprises a displacement bracket and a non-contact displacement sensor. The non-contact displacement sensor is mounted on the displacement bracket, and a measuring end of the non-contact displacement sensor faces the workbench.

2. A self-excited vibration test device according to claim 1, characterized in that: The workbench also includes an auxiliary plate, which is arranged between the mounting seat and the pressure sensor. A triangular support plate is installed on the auxiliary plate, and a torque sensor is installed on the triangular support plate. A torque auxiliary block is provided on the side of the mounting seat, and the auxiliary block can contact the torque sensor when the mounting seat rotates.

3. A self-excited vibration test device according to claim 1, characterized in that: The displacement module also includes a second lifting mechanism, which is used to drive the displacement bracket to perform reciprocating linear motion.

4. A self-excited vibration test device according to claim 1, characterized in that: A triaxial acceleration sensor is installed in the circumferential direction of the mounting seat.

5. A self-excited vibration test device according to claim 4, characterized in that: The first lifting mechanism and the second lifting mechanism include one of a linear motor, a pneumatic cylinder, a hydraulic cylinder, an electric cylinder, a screw mechanism or a threaded mechanism.

6. A self-excited vibration test device according to claim 5, characterized in that: It also includes a slide and a slide seat. The excited module is installed on the slide, the main bracket is installed on the slide seat, and the slide is slidably connected to the slide seat.

7. A self-excited vibration test device according to claim 1, characterized in that: The active ring is detachably connected to the driver.

8. A self-excited vibration test device according to claim 2, characterized in that: It also includes a spring support plate and a spring. The spring support plate is arranged between the mounting seat and the auxiliary plate. The spring is arranged between the spring support plate and the auxiliary plate. The mounting seat is installed on the spring support plate.

9. A self-excited vibration test device according to claim 1, characterized in that: The component to be tested and the mounting seat are integrally formed.

10. A self-excited vibration testing device according to claim 9, characterized in that: A coaxial sleeve on the mounting seat is provided with a metal ring.

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