Variable-direction, variable-frequency and variable-amplitude vibration fatigue testing device and testing method

Abstract

The invention discloses a direction-variable, frequency-variable and amplitude-variable vibration fatigue test device and test method in the technical field of new energy equipment, and the device comprises a test supporting rack which is provided with a flat plate type part installation size adjusting device and a flat plate type part fixing device. A vibration driving device, an amplitude adjusting device, a vibration direction adjusting device and a sliding rail guiding device are installed on the flat plate type component installation size adjusting device. The vibration driving device comprises a mounting vertical plate and a vibration driving motor, the bottom of the mounting vertical plate is connected with a mounting bottom plate matched with the flat plate type component mounting size adjusting device, and the vibration driving motor is in transmission connection with the amplitude adjusting device through a speed reducer. The device can simulate the extreme working state of the flat plate type component under the dynamic wind load fatigue action of downwind, upwind, crosswind and the like, effectively simulates and detects the service life condition of the flat plate type component under the dynamic wind load action, and has the advantages of being adjustable in amplitude, vibration frequency and vibration direction, high in applicability, simple to debug and convenient to maintain.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy equipment, and in particular to a vibration fatigue testing device and a testing method capable of changing direction, frequency and amplitude. Background Art

[0002] Outdoor suspended flat panel components, such as solar panels, are almost inevitably subject to fatigue damage caused by various wind loads in daily life. This can cause deformation and displacement, fatigue damage, and even breakage and fragmentation, shortening the panel's service life and increasing investment costs. New solar installation methods, secured to guy wires, can experience rigid body motion and elastic vibration in the panel if subjected to gusty, strong, or rotating winds, reducing its structural safety, operational reliability, and the economic efficiency of energy conversion. Therefore, vibration fatigue testing must be performed on solar panel components before installation.

[0003] At present, in order to simulate the impact of vibration on flat-plate components, a single-point vibration test method is usually used. The single-point vibration fatigue test of flat-plate components can obtain the fatigue life of flat-plate components and can more accurately simulate the fatigue characteristics of flat-plate components under vibration. However, the setting of vibration parameters and experimental installation preparation are relatively cumbersome, and only fixed vibration frequency and amplitude can be simulated at a single action point, making it difficult to simulate the effects of wind force and wind direction changes on flat-plate components. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects in the prior art and provide a vibration fatigue testing device and test method with variable direction, frequency and amplitude, which is convenient for adjusting parameters such as vibration direction, vibration frequency and vibration amplitude, and can truly and accurately simulate the vibration fatigue characteristics of wind force and wind direction on solar flat-plate components. The parameter adjustment method is simple, which improves the scope of use of existing vibration fatigue testing devices.

[0005] The object of the present invention is achieved as follows: a vibration fatigue testing device with variable direction, frequency and amplitude, including a test support stand, a support base of the test support stand is provided with a flat plate component installation size adjustment device and a flat plate component fixing device, the flat plate component installation size adjustment device is installed with a vibration driving device, an amplitude adjustment device, a vibration direction adjustment device and a slide rail guide device; the vibration driving device includes a mounting vertical plate and a vibration driving motor, the bottom of the mounting vertical plate is connected to a mounting base plate, and the mounting base plate is installed in conjunction with the flat plate component installation size adjustment device. The driving motor is connected to the amplitude adjustment device through the mounting hole in the middle of the mounting vertical plate via a reducer; the amplitude adjustment device includes an adjustable crank, a planetary balance wheel, an amplitude fixing block and an amplitude indicator; the output shaft end of the vibration driving motor is connected to the adjustable crank through a transmission connection, the adjustable crank is fixedly connected to the amplitude indicator by a bolt, and an amplitude fixing block is connected to one end face of the adjustable crank through a planetary balance wheel, the amplitude fixing block is fixedly connected to the amplitude slider, the amplitude slider is slidably connected to the transverse guide rail, and the transverse guide rail is fixedly set on the transverse guide rail mounting plate of the amplitude adjustment device.

[0006] When the present invention is working, a vibration driving device is arranged on the test support stand, an amplitude and vibration direction adjusting device is arranged on the vibration adjusting device, and the vibration is transmitted to the flat-plate components through the slide rail guide device, so as to simulate the extreme working state of the flat-plate components under the fatigue action of dynamic wind loads such as tailwind, headwind and crosswind, effectively simulate and detect the life of the flat-plate components under dynamic wind loads, and has the advantages of adjustable amplitude, frequency and vibration direction, strong applicability, simple debugging and convenient maintenance.

[0007] Furthermore, the vibration direction adjustment device includes a turntable motor fixedly arranged on the side of the mounting vertical plate of the vibration driving device, and the output shaft end of the turntable motor is transmission-connected to the turntable fixed on the mounting vertical plate through a turntable fixing block, and a connecting backplate is fixed on the turntable, and the connecting backplate is connected to the slide rail guide device through a slider connector.

[0008] Furthermore, the slide rail guide device includes two symmetrically arranged vertical guide rails, and four sliders are symmetrically provided on the opposite inner sides of the two vertical guide rails. The four sliders are fixedly connected to the connecting back plate through slider connectors. The outer sides of the two vertical guide rails are fixedly provided on the opposite inner walls of the connecting frame, and the top of the connecting frame is provided with a clamping ring for connecting a flat-plate component fixing device.

[0009] Furthermore, the flat-plate component fixing device includes a cable fixing support plate symmetrically arranged on the support reinforcement rib on the side of the test support platform, a cable fixing support plate on one side is provided with an anchor tensioner, and a cable fixing support plate on the other side is provided with a tension sensor. One end of the cable is wrapped around the anchor tensioner, and the other end passes through the clamp and is fixed on the limit block via the tension sensor.

[0010] Furthermore, a flat plate-like component is mounted above the flat plate-like component fixing device via a pair of fixing rods, and the flat plate-like component is connected to the vibration output fulcrum via the clamping ring.

[0011] Furthermore, the size adjustment device for installing flat-plate components includes a pair of symmetrically arranged longitudinal size adjustment fixings, a pair of symmetrically arranged transverse size adjustment fixings above the longitudinal size adjustment fixings, and a size adjustment motor is respectively provided at the end of the longitudinal size adjustment fixings and the transverse size adjustment fixings, and the output shaft end of the size adjustment motor is transmission-connected to the longitudinal size adjustment screw and the transverse size adjustment screw respectively arranged inside the longitudinal size adjustment fixings and the transverse size adjustment fixings; a sliding mounting block is fixed on the upper surface of the pair of transverse size adjustment fixings, which is connected to the mounting base plate of the vibration drive device through the sliding mounting block.

[0012] Furthermore, four vibration driving devices are provided, and four amplitude adjusting devices, four vibration direction adjusting devices and four slide rail guiding devices are provided in a one-to-one correspondence with each vibration driving device.

[0013] Furthermore, six supporting columns are provided below the supporting base of the test support stand, and the test support stand is made of welded steel sections.

[0014] A test method for a vibration fatigue testing device capable of variable direction, frequency and amplitude, comprising the following steps:

[0015] (1) Setting of vibration parameters

[0016] Setting the same motor speed for each of the four vibration drive motors can achieve same-frequency vibration testing of flat-plate components; setting different motor speeds for each of the four vibration drive motors can achieve variable-frequency vibration testing of flat-plate components; adjusting the same-size positions of the four amplitude fixing blocks can achieve same-amplitude vibration testing of flat-plate components; adjusting the different-size positions of the four amplitude fixing blocks can achieve variable-amplitude vibration testing of flat-plate components; adjusting the turntable angle values ​​of the two vibration direction adjustment devices on the same side to change the direction of the vibration output point on the same side can achieve windward or leeward vibration testing of flat-plate components; adjusting the turntable angle values ​​of the two diagonal vibration direction adjustment devices to change the direction of the diagonal vibration output point can achieve bending and torsional vibration fatigue testing of flat-plate components;

[0017] (2) Calculation of vibration parameters

[0018]

[0019] The motion equation of the vibration fulcrum in the direction of the guide rail is:

[0020] W=Lsin(ωt+θ),

[0021] The adjustment method of the vibration direction φ is:

[0022] φ=2πn2t,

[0023] Wherein, L is the amplitude fixed block size position reading, mm;

[0024] ω is the vibration frequency;

[0025] θ is the initial angle of the amplitude fixed block, °;

[0026] n1 is the speed of the vibration drive motor, r / min;

[0027] i is the reduction ratio;

[0028] n2 is the motor speed for adjusting the vibration direction, r / min;

[0029] The vibration drive motor drives the rotation of the amplitude adjustment device to control the vibration frequency of the vibration fulcrum. The size and position of the amplitude fixing block changes the effective length of the adjustable crank to adjust the vibration amplitude. Through the actual setting of four vibration drive motors, four turntable motors, four adjustable crank lengths and four turntable angles, the test conditions of the vibration frequency, amplitude and vibration direction of flat-plate components can be finally set.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] First, the testing device of the present invention has a stable structure, strong rigidity, and can be moved as a whole. It is applicable to vibration testing of flat-plate components of different sizes, and is simple to install, low in cost, and easy to operate in testing and controlling.

[0032] Second, the vibration fatigue testing device of the present invention is driven by a motor to drive the adjustable crank to rotate, thereby realizing the generation and adjustment of the vibration frequency, adjusting the vibration amplitude by changing the position of the amplitude fixing block, and biasing the vibration direction by changing the vibration angle of the output point by adjusting the turntable. The parameter adjustment method is simple, which improves the scope of use of the existing vibration fatigue testing device.

[0033] Third, the vibration fatigue test device of the present invention is provided with four sets of vibration components, which are installed on the test support frame through the flat plate component installation size adjustment device. The vibration components are connected to the vibration drive device and the amplitude adjustment device through the slide guide device, and the vibration direction adjustment device is installed on the vibration drive device. When the turntable motor drives the turntable to rotate, the vibration direction can be changed; when the vibration drive motor drives the adjustable crank to rotate, the slide guide device converts the rotation of the adjustable crank into reciprocating motion of the slider connector, and the slider connector transmits the reciprocating motion to the flat plate component support frame. Its synchronization method is four crank slider mechanisms. This transmission method can not only effectively avoid the generation of vibration internal stress in the flat plate components due to gravity factors and installation errors, but also solve the problem that the vibration frequency, direction, and amplitude caused by wind action cannot be adjusted, affecting the accuracy and applicability of the vibration fatigue test. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the vibration fatigue testing device of the present invention.

[0035] Figure 2 It is a structural schematic diagram of the vibration driving device in the vibration fatigue testing device of the present invention.

[0036] Figure 3 It is a structural schematic diagram of the amplitude adjustment device in the vibration fatigue testing device of the present invention.

[0037] Figure 4 It is a structural schematic diagram of the support stand in the vibration fatigue testing device of the present invention.

[0038] Figure 5 It is a structural schematic diagram of the plate-type component fixing device in the vibration fatigue testing device of the present invention.

[0039] Figure 6 This is a structural diagram of a size adjustment device for installing a flat-plate component in the vibration fatigue testing device of the present invention.

[0040] Figure 7 It is a structural schematic diagram of the slide rail guide device in the vibration fatigue testing device of the present invention.

[0041] In the figure above, 1 is the test support frame, 1-1 is the support base, 1-2 is the support column, and 1-3 is the support reinforcement rib;

[0042] 2 vibration drive device, 2-1 vibration drive motor, 2-2 speed reducer, 2-3 installation vertical plate, 2-4 installation base plate;

[0043] 3 Amplitude adjustment device, 3-1 Adjustable crank, 3-2 Amplitude indicator, 3-3 Amplitude slider, 3-4 Amplitude fixing block, 3-5 Amplitude slider, 3-6 Transverse guide rail, 3-7 Transverse guide rail mounting plate;

[0044] 4 vibration direction adjustment device, 4-1 turntable motor, 4-2 turntable, 4-3 turntable fixing block, 4-4 connecting back plate;

[0045] 5 slide rail guide device, 5-1 slider, 5-2 vertical guide rail, 5-3 slider connector, 5-4 connecting frame, 5-5 snap ring;

[0046] 6 Fixing device for flat plate components, 6-1 anchor locker, 6-2 cable fixing support plate, 6-3 tension sensor, 6-4 limit block, 6-5 cable;

[0047] 7. Size adjustment device for mounting flat plate components, 7-1. Longitudinal size adjustment screw, 7-2. Horizontal size adjustment screw, 7-3. Longitudinal size adjustment fixture, 7-4. Horizontal size adjustment fixture, 7-5. Sliding mounting block, 7-6. Size adjustment motor;

[0048] 8. Flat plate components. DETAILED DESCRIPTION

[0049] like Figures 1 to 7The vibration fatigue testing device with variable direction, frequency and amplitude shown in the figure comprises a test support stand 1, a support base 1-1 of the test support stand 1 is provided with a flat plate component installation size adjustment device 7 and a flat plate component fixing device 6, a vibration driving device 2, an amplitude adjustment device 3, a vibration direction adjustment device 4 and a slide rail guide device 5 are installed on the flat plate component installation size adjustment device 7; the vibration driving device 2 comprises a mounting vertical plate 2-3 and a vibration driving motor 2-1, the bottom of the mounting vertical plate 2-3 is connected to a mounting base plate 2-4, which is installed in conjunction with the mounting base plate 2-4 and the flat plate component installation size adjustment device 7, and the vibration driving motor 2-1 passes through the mounting vertical plate 2-3 through the reducer 2-2. The mounting hole in the middle of the plate 2-3 is transmission-connected to the amplitude adjustment device 3; the amplitude adjustment device 3 includes an adjustable crank 3-1, a planetary balance wheel, an amplitude fixing block 3-4 and an amplitude indicator 3-2. The output shaft end of the vibration drive motor 2-1 is transmission-connected to the adjustable crank 3-1. The amplitude indicator 3-2 is fixedly connected to the adjustable crank 3-1 by bolts. An amplitude fixing block 3-4 is connected to one end face of the adjustable crank 3-1 through a planetary balance wheel. An amplitude slider 3-3 is fixedly connected to the amplitude fixing block 3-4. The amplitude slider 3-3 is slidably connected to the transverse guide rail 3-6. The transverse guide rail 3-6 is fixedly set on the transverse guide rail mounting plate 3-7 of the amplitude adjustment device 3. Driven by the vibration drive motor 2-1, the adjustable crank 3-1 is driven to rotate, and the position of the amplitude fixing block 3-4 on the planetary balance wheel on the amplitude indicator 3-2 is adjusted. The slide guide device 5 converts the rotation of the adjustable crank 3-1 into the up and down reciprocating motion of the slider connector 5-3. The slider connector 5-3 transmits the reciprocating motion to the flat-plate component fixing device 6, driving the flat-plate component 8 to vibrate, changing the speed of the vibration drive motor 2-1, and realizing the output of vibration motion and frequency.

[0050] The vibration direction adjustment device 4 includes a turntable motor 4-1 fixedly mounted on the side of the mounting plate 2-3 of the vibration drive device 2. The output shaft end of the turntable motor 4-1 is drivingly connected to a turntable 4-2 fixed to the mounting plate 2-3 via a turntable fixing block 4-3. A connecting back plate 4-4 is fixed to the turntable 4-2, and the connecting back plate 4-4 is connected to the slide rail guide device 5 via a slider connector 5-3. By rotating the turntable motor 4-1 to adjust the rotation angle of the turntable 4-2, the vibration direction is changed. By changing the rotation angle value of the four motors 4-1, they can rotate at positive and negative angles to achieve output with different vibration directions.

[0051] The slide rail guiding device 5 includes two symmetrically arranged vertical guide rails 5-2, and four sliders 5-1 are symmetrically arranged on the opposite inner sides of the two vertical guide rails 5-2. The four sliders 5-1 are fixedly connected to the connecting back plate 4-4 through slider connectors 5-3. The outer sides of the two vertical guide rails 5-2 are fixedly arranged on the opposite inner walls of the connecting frame 5-4. The top of the connecting frame 5-4 is provided with a clamping ring 5-5 for connecting to the flat-plate component fixing device 6; the vibration amplitude and frequency are output to the flat-plate component fixing device 6 through the slide rail guiding device 5, and finally the vibration is generated.

[0052] The flat-plate component fixture 6 includes a cable-fixing support plate 6-2 symmetrically arranged on the support reinforcement rib 1-3 on the side of the test support rig 1. An anchor tensioner 6-1 is provided on one cable-fixing support plate 6-2, and a tension sensor 6-3 is provided on the other cable-fixing support plate 6-2. A cable 6-5 has one end wrapped around the anchor tensioner 6-1 and the other end passed through a retaining ring 5-5 and secured to a limit block 6-4 via the tension sensor 6-3. A flat-plate component 8 is mounted above the flat-plate component fixture 6 via a pair of fixing rods. The retaining ring 5-5 connects the flat-plate component 8 to the vibration output fulcrum. Depending on the size of the flat-plate component or the test point requirements, the cable 6-5 is adjusted via the anchor tensioner 6-1, and the tension of the cable 6-5 is adjusted based on the reading of the tension sensor 6-3, thus meeting the different installation requirements of different experimental objects and conditions.

[0053] The device 7 for adjusting the size of a flat-plate component includes a pair of symmetrically arranged longitudinal size adjustment fixtures 7-3, a pair of symmetrically arranged transverse size adjustment fixtures 7-4 above the longitudinal size adjustment fixtures 7-3, and a size adjustment motor 7-6 at the end of each of the longitudinal size adjustment fixtures 7-3 and the transverse size adjustment fixtures 7-4. The output shaft end of the size adjustment motor 7-6 is connected to the longitudinal size adjustment screw 7-1 and the transverse size adjustment screw 7-2 respectively arranged inside the longitudinal size adjustment fixture 7-3 and the transverse size adjustment fixture 7-4. A sliding mounting block 7-5 is fixed on the upper surface of the pair of transverse size adjustment fixtures 7-4, which is connected to the mounting base 2-4 of the vibration drive device 2 via the sliding mounting block 7-5. According to the size of the flat-plate component or the test point requirements, the longitudinal size adjustment screw 7-1 and the transverse size adjustment screw 7-2 are driven to rotate by the size adjustment motor 7-6, thereby changing the position of the longitudinal size adjustment fixture 7-3 and the transverse size adjustment fixture 7-4, thereby realizing bidirectional adjustment of the vibration output fulcrum installation position.

[0054] There are four vibration driving devices 2 , and there are four amplitude adjusting devices 3 , four vibration direction adjusting devices 4 and four slide rail guiding devices 5 corresponding to each of the vibration driving devices 2 .

[0055] Six supporting columns 1-2 are provided below the supporting base 1-1 of the test supporting stand 1, and the test supporting stand 1 is made of welded steel sections.

[0056] A test method for a vibration fatigue testing device capable of variable direction, frequency and amplitude, comprising the following steps:

[0057] (1) Setting of vibration parameters

[0058] By setting the same motor speed for each of the four vibration drive motors 2-1, a same-frequency vibration test of the flat-plate component 8 can be achieved; by setting different motor speeds for each of the four vibration drive motors 2-1, a variable-frequency vibration test of the flat-plate component 8 can be achieved; by adjusting the same-size positions of the four amplitude fixing blocks 3-4, a same-amplitude vibration test of the flat-plate component 8 can be achieved; by adjusting the different-size positions of the four amplitude fixing blocks 3-4, a variable-amplitude vibration test of the flat-plate component 8 can be achieved; by adjusting the rotation angle values ​​of the turntable 4-2 of the two vibration direction adjusting devices 4 on the same side and changing the direction of the vibration output point on the same side, a windward or leeward vibration test of the flat-plate component 8 can be achieved; by adjusting the rotation angle values ​​of the turntable 4-2 of the two diagonal vibration direction adjusting devices 4 and changing the direction of the diagonal vibration output point, a bending and torsional vibration fatigue test of the flat-plate component 8 can be achieved;

[0059] (2) Calculation of vibration parameters

[0060]

[0061] The motion equation of the vibration fulcrum in the direction of the guide rail is:

[0062] W=Lsin(ωt+θ),

[0063] The adjustment method of the vibration direction φ is:

[0064] φ=2πn2t,

[0065] Wherein, L is the amplitude fixed block size position reading, mm;

[0066] ω is the vibration frequency;

[0067] θ is the initial angle of the amplitude fixed block, °;

[0068] n1 is the speed of the vibration drive motor, r / min;

[0069] i is the reduction ratio;

[0070] n2 is the motor speed for adjusting the vibration direction, r / min;

[0071] The vibration drive motor 2-1 drives the amplitude adjustment device 3 to rotate to realize the control of the vibration frequency of the vibration fulcrum. The size and position of the amplitude fixing block 3-4 changes the effective length of the adjustable crank 3-1 to complete the adjustment of the vibration amplitude. Through the actual setting of four vibration drive motors 2-1, four turntable motors 4-1, four adjustable crank 3-1 lengths, and four turntable 4-2 rotation angles, the test conditions of the vibration frequency, amplitude, and vibration direction of the flat-plate component 8 can be finally completed.

[0072] The vibration fatigue testing device of the present invention is driven by a vibration drive motor 2-1, which drives the adjustable crank 3-1 to rotate, thereby realizing the generation and adjustment of the vibration frequency. The vibration amplitude is adjusted by changing the position of the amplitude fixing block 3-4. The vibration direction is biased by changing the vibration angle of the output point by adjusting the turntable 4-2. The parameter adjustment method is simple, which improves the scope of use of the existing vibration fatigue testing device.

[0073] The vibration fatigue testing device of the present invention is provided with four sets of vibration components, which are installed on the support frame 1 through the flat plate component installation size adjustment device 7. The vibration components are connected to the vibration drive device 2 and the amplitude adjustment device 3 through the slide guide device 5, and the vibration direction adjustment device 4 is installed on the vibration drive device 2. When the turntable motor 4-1 drives the turntable 4-2 to rotate, the vibration direction can be changed; when the vibration drive motor 2-1 drives the adjustable crank 3-1 to rotate, the slide guide device 5 converts the rotation of the adjustable crank 3-1 into the up and down reciprocating motion of the slider connector 5-3, and the slider connector 5-3 transmits the reciprocating motion to the flat plate component fixing device 6. Its synchronization method is four crank slider mechanisms. This transmission method can not only effectively avoid the generation of vibration internal stress in the flat plate components due to gravity factors and installation errors, but also solve the problem that the vibration frequency, direction, and amplitude caused by wind power cannot be adjusted, affecting the accuracy and applicability of the vibration fatigue test.

[0074] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some of the technical features therein according to the disclosed technical content without creative labor, and these substitutions and modifications are all within the protection scope of the present invention.

Claims

1. A vibration fatigue testing device capable of variable direction, frequency and amplitude, characterized by: The invention also provides a plurality of control devices, such as a plurality of control devices, and a plurality of control devices for adjusting the size of the plate-type components. The plurality of control devices are connected to the plurality of control devices through the plurality of control devices. The plurality of control devices are connected to the plurality of control devices through the plurality of control devices.

2. The vibration fatigue testing device with variable direction, frequency and amplitude according to claim 1, characterized in that: The vibration direction adjustment device includes a turntable motor fixedly arranged on the side of the mounting vertical plate of the vibration driving device, the output shaft end of the turntable motor is transmission-connected to the turntable fixed on the mounting vertical plate through a turntable fixing block, a connecting backplate is fixed on the turntable, and the connecting backplate is connected to the slide rail guide device through a slider connector.

3. The vibration fatigue testing device with variable direction, frequency and amplitude according to claim 2, characterized in that: The slide rail guide device includes two symmetrically arranged vertical guide rails, and four sliders are symmetrically provided on the opposite inner sides of the two vertical guide rails. The four sliders are fixedly connected to the connecting back plate through slider connectors. The outer sides of the two vertical guide rails are fixedly provided on the opposite inner walls of the connecting frame, and the top of the connecting frame is provided with a clamping ring for connecting a flat-plate component fixing device.

4. The vibration fatigue testing device with variable direction, frequency and amplitude according to claim 3, characterized in that: The flat-plate component fixing device includes a cable fixing support plate symmetrically arranged on the support reinforcement rib on the side of the test support platform, a cable fixing support plate on one side is provided with an anchor tensioner, and a cable fixing support plate on the other side is provided with a tension sensor. One end of the cable is wrapped around the anchor tensioner, and the other end passes through the clamping ring and is fixed to the limit block via the tension sensor.

5. The vibration fatigue testing device with variable direction, frequency and amplitude according to claim 4, characterized in that: A flat plate component is mounted above the flat plate component fixing device via a pair of fixing rods, and the flat plate component is connected to the vibration output fulcrum via the clamping ring.

6. The vibration fatigue testing device with variable direction, frequency and amplitude according to claim 1, characterized in that: The device for adjusting the size of flat-plate components includes a pair of symmetrically arranged longitudinal size adjustment fixings, a pair of symmetrically arranged transverse size adjustment fixings above the longitudinal size adjustment fixings, a size adjustment motor is respectively provided at the end of the longitudinal size adjustment fixings and the transverse size adjustment fixings, the output shaft end of the size adjustment motor is transmission-connected to the longitudinal size adjustment screw and the transverse size adjustment screw respectively arranged inside the longitudinal size adjustment fixings and the transverse size adjustment fixings; a sliding mounting block is fixedly provided on the upper surface of the pair of transverse size adjustment fixings, which is connected to the mounting base plate of the vibration drive device through the sliding mounting block.

7. A vibration fatigue testing device with variable direction, frequency and amplitude according to any one of claims 1 to 6, characterized in that: There are four vibration driving devices, and four amplitude adjusting devices, vibration direction adjusting devices and slide rail guiding devices are respectively provided in one-to-one correspondence with the vibration driving devices.

8. A vibration fatigue testing device with variable direction, frequency and amplitude according to any one of claims 1 to 6, characterized in that: Six supporting columns are provided below the supporting base of the test support bench, and the test support bench is made of welded steel sections.

9. A test method for a vibration fatigue test device capable of variable direction, frequency and amplitude, characterized in that: The following steps are involved: (1) Setting of vibration parameters Setting the same motor speed for each of the four vibration drive motors can achieve same-frequency vibration testing of flat-plate components; setting different motor speeds for each of the four vibration drive motors can achieve variable-frequency vibration testing of flat-plate components; adjusting the same-size positions of the four amplitude fixing blocks can achieve same-amplitude vibration testing of flat-plate components; adjusting the different-size positions of the four amplitude fixing blocks can achieve variable-amplitude vibration testing of flat-plate components; adjusting the turntable angle values ​​of the two vibration direction adjustment devices on the same side to change the direction of the vibration output point on the same side can achieve windward or leeward vibration testing of flat-plate components; adjusting the turntable angle values ​​of the two diagonal vibration direction adjustment devices to change the direction of the diagonal vibration output point can achieve bending and torsional vibration fatigue testing of flat-plate components; (2) Calculation of vibration parameters The motion equation of the vibration fulcrum in the direction of the guide rail is: W=Lsin(ωt+θ), The adjustment method of the vibration direction φ is: φ=2πn2t, Wherein, L is the size and position reading of the amplitude fixed block, mm; ω is the vibration frequency; θ is the initial angle of the amplitude fixed block, degrees; n1 is the speed of the vibration drive motor, r / min; i is the reduction ratio; n2 is the speed of the vibration direction adjustment motor, r / min; Among them, the vibration drive motor drives the rotational movement of the amplitude adjustment device to realize the control of the vibration frequency of the vibration fulcrum, and the size and position of the amplitude fixing block changes the effective length of the adjustable crank to complete the adjustment of the vibration amplitude. Through the actual setting of four vibration drive motors, four turntable motors, four adjustable crank lengths, and four turntable angles, the test conditions of the vibration frequency, amplitude, and vibration direction of flat-plate components can be finally completed.

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