Low-frequency vibration test structure

Abstract

The utility model relates to the technical field of vibration testing, in particular to a low-frequency vibration testing structure. The technical problems that most of existing vibration table bodies are connected with a base through an air bag, relative movement exists between the vibration table bodies and the base, when a large-displacement test is carried out, the relative displacement between the vibration table bodies and the base is large, the springback phenomenon of a vibration generation assembly is likely to happen through a flexible connection mode of the air bag, and the vibration table bodies are damaged are solved. And the lower limit frequency of the vibration table is relatively high. According to the technical scheme, the low-frequency vibration testing structure comprises a bearing base, a vibration table, a clamping assembly, a lifting assembly and a limiting assembly, an L-shaped telescopic sleeve is rotationally connected with a rotating column through a second rotating shaft under the driving of a driver, so that the L-shaped telescopic sleeve is always kept in a horizontal state, and then a square telescopic column shrinks along the L-shaped telescopic sleeve; the to-be-tested product is limited and fixed, so that the situation that the test result is affected due to the fact that the product moves during low-frequency vibration test is avoided, and the test accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration testing, in particular to a low-frequency vibration testing structure. Background Art

[0002] Low-frequency vibration test is a laboratory test method used to evaluate the performance of products in low-frequency vibration environments. This test method simulates the vibration environment that the product may encounter during actual transportation, operation or use, so as to evaluate whether the product can maintain normal working conditions under these conditions. Therefore, it is widely used in defense, aerospace, aviation, communications, electronics, automobiles and other fields. The electric vibration table is a common vibration test structure. Most of the existing vibration table bodies are connected to the base through air bags, so that there is relative movement between the vibration table body and the base. When conducting large displacement tests, the relative displacement between the vibration table body and the base is large. The flexible connection method of the air bag can easily cause the vibration generating component to rebound, making the lower limit frequency of the vibration table higher; so we proposed a low-frequency vibration test structure to solve the above problems. Utility Model Content

[0003] In order to overcome the problem that most existing vibration tables are connected to the base through air bags, so that there is relative movement between the vibration table and the base, when conducting large displacement tests, the relative displacement between the vibration table and the base is large, and the flexible connection method of the air bag easily causes the vibration generating component to rebound, resulting in a higher lower limit frequency of the vibration table.

[0004] The technical solution of the utility model is: a low-frequency vibration test structure, including a load-bearing base, a vibration table, a clamping assembly, a lifting assembly and a limiting assembly; a vibration table for placing a product to be tested and performing a performance test on the product in a low-frequency vibration environment is installed on the upper end of the load-bearing base, four groups of clamping assemblies for reducing a certain degree of rebound generated by the vibration table after reaching the maximum amplitude are installed around the outside of the load-bearing base, a limiting assembly for telescopic adjustment according to the size of the product to be tested and fixing its position is provided above the vibration table, and lifting assemblies for lifting and rotating the limiting assembly and fixedly connected to the vibration table at the lower end are installed at the external corners of the limiting assembly.

[0005] Preferably, after the product to be tested is fixed, according to the position of the edge of the vibration table, the guide column is driven by the first motor to rotate to a suitable angle with the support column through the first rotating shaft, and then the connecting column is driven by the second motor to rotate to a suitable angle with the guide column through the second rotating shaft. Then, by the drive of the third motor, the connecting block is driven by the third rotating shaft and the connecting column to a suitable angle until the circular magnetic block and the circular iron sheet are fit and connected for preliminary positioning. Finally, by the drive of the driver, the arc clamping plate is rotated and connected with the connecting block through the connecting shaft to clamp the edge of the vibration table, thereby reducing a certain degree of rebound generated after the vibration table reaches the maximum amplitude, thereby reducing the lower limit frequency of the vibration table.

[0006] Preferably, mounting holes for bolts to pass through are opened at the corners of the load-bearing base, a circular vertical plate is installed on the upper end of the load-bearing base, a circular placement table is installed on the upper end of the circular vertical plate, load-bearing springs are installed at the upper corners of the circular placement table, and dampers are provided inside the load-bearing springs. The load-bearing base is fixedly connected to the ground by bolts passing through the mounting holes. Then the sensor is installed on the product to be tested, and the product to be tested is placed on the vibration table, and the parameters of the vibration table are adjusted to simulate various low-frequency vibration environments.

[0007] Preferably, a circular support plate fixedly connected to the load-bearing spring is installed at the lower edge of the vibration table, a vibrator is installed in the middle of the lower end of the vibration table, and four groups of circular iron sheets are installed around the outside of the vibration table. Then, driven by the vibrator, the product to be tested starts to vibrate at a low frequency along with the load-bearing spring, and the vibration response of the product is monitored within the operating frequency range of the sensor, and the monitored data is transmitted to the data acquisition system for analysis and processing.

[0008] Preferably, the clamping assembly includes a support column, a first rotating shaft, a first motor, a guide column, a second rotating shaft, a second motor, a connecting column, a third rotating shaft, a third motor, a connecting block, a circular magnetic block, a connecting rotating shaft and an arc-shaped clamping plate. The first rotating shaft is installed at one end of the support column away from the circular vertical plate, and the first motor is installed on one side of the first rotating shaft. According to the position of the edge of the vibration table, the guide column is driven by the first rotating shaft and the support column to a suitable angle, and then the connecting column is driven by the second rotating shaft and the guide column to a suitable angle.

[0009] Preferably, the guide column is rotatably connected to the support column via a first rotating shaft, a second rotating shaft is installed at one end of the guide column away from the first rotating shaft, a second motor is installed on one side of the second rotating shaft, the connecting column is rotatably connected to the guide column via the second rotating shaft, a third rotating shaft is installed at one end of the connecting column away from the second rotating shaft, a third motor is installed on one side of the third rotating shaft, and then, driven by the third motor, the connecting block is rotated to a suitable angle through the third rotating shaft and the connecting column until the circular magnetic block is fit and connected with the circular iron sheet for initial positioning.

[0010] Preferably, the connecting block is rotatably connected to the connecting column via a third rotating shaft, a circular magnetic block is installed in the middle of a side of the connecting block away from the third rotating shaft, connecting rotating shafts are symmetrically installed at the upper and lower ends of the connecting block, a driver is installed at one end of the connecting rotating shaft, and the arc-shaped clamping plate is rotatably connected to the connecting block via the connecting rotating shaft. Finally, driven by the driver, the arc-shaped clamping plate is rotatably connected to the connecting block via the connecting rotating shaft to clamp the edge of the vibration table, thereby reducing a certain degree of rebound generated after the vibration table reaches the maximum amplitude, thereby reducing the lower limit frequency of the vibration table.

[0011] Preferably, the lifting assembly includes a rectangular telescopic column, a rectangular telescopic sleeve, a cylinder, a first rotating shaft, a rotating column and a second rotating shaft. The rectangular telescopic sleeve is internally sleeved with a rectangular telescopic column, the upper end of the rectangular telescopic sleeve is equipped with a cylinder, the end of the rectangular telescopic sleeve away from the rectangular telescopic column is equipped with a first rotating shaft, the rotating column is rotatably connected to the rectangular telescopic sleeve through the first rotating shaft, the end of the rotating column away from the first rotating shaft is equipped with a second rotating shaft, and one side of the first rotating shaft and the second rotating shaft are both equipped with a driver. According to the height of the product to be tested, the rectangular telescopic sleeve is driven by the cylinder to move to a suitable height along the rectangular telescopic column, and then according to the size of the product to be tested, the rotating column is driven by the driver to be rotatably connected to the rectangular telescopic sleeve through the first rotating shaft.

[0012] Preferably, the limiting assembly includes an L-shaped telescopic sleeve and a square telescopic column. Four groups of L-shaped telescopic sleeves are arranged around, and a square telescopic column is arranged and connected between every two groups of L-shaped telescopic sleeves. The L-shaped telescopic sleeve is rotatably connected to the rotating column through a second rotating shaft. At the same time, through the drive of the driver, the L-shaped telescopic sleeve is rotatably connected to the rotating column through the second rotating shaft, so that the L-shaped telescopic sleeve always maintains a horizontal state. During this process, the square telescopic column contracts along the L-shaped telescopic sleeve to limit and fix the product to be tested, thereby avoiding movement during low-frequency vibration testing, thereby affecting the test results and improving the accuracy of the test.

[0013] Beneficial effects of the utility model:

[0014] 1. In the past, most vibration tables were connected to the base through airbags, so that there was relative movement between the vibration table and the base. When a large displacement test was performed, the relative displacement between the vibration table and the base was large. The flexible connection of the airbags easily led to rebound of the vibration generating components, which made the lower limit frequency of the vibration table higher. The difference is that after the product to be tested is fixed, according to the position of the edge of the vibration table, the guide column is driven by the first motor to rotate to a suitable angle with the support column through the first shaft, and then the connecting column is driven by the second motor to rotate to a suitable angle with the guide column through the second shaft, and then the connecting block is driven by the third motor to rotate to a suitable angle with the connecting column through the third shaft, until the circular magnetic block is fitted and connected with the circular iron sheet for preliminary positioning. Finally, the arc clamping plate is driven by the driver to rotate and connect with the connecting block through the connecting shaft to clamp the edge of the vibration table, thereby reducing a certain degree of rebound after the vibration table reaches the maximum amplitude, thereby reducing the lower limit frequency of the vibration table.

[0015] 2. The load-bearing base is fixedly connected to the ground through bolts passing through the mounting holes. Then the sensor is installed on the product to be tested, and the product to be tested is placed on the vibration table. According to the height of the product to be tested, the rectangular telescopic sleeve is moved to a suitable height along the rectangular telescopic column by the drive of the cylinder. Then, according to the size of the product to be tested, the rotating column is rotatably connected to the rectangular telescopic sleeve through the first rotating axis by the drive of the driver. At the same time, the L-shaped telescopic sleeve is rotatably connected to the rotating column through the second rotating axis by the drive of the driver, so that the L-shaped telescopic sleeve always maintains a horizontal state. In this process, the square telescopic column shrinks along the L-shaped telescopic sleeve to limit and fix the product to be tested, so as to avoid movement during low-frequency vibration testing, thereby affecting the test results and improving the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the load-bearing base structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the vibration table of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the clamping assembly of the utility model;

[0020] Figure 5 It is a schematic diagram of the structure of the lifting component of the utility model.

[0021] Description of reference numerals: 1, load-bearing base; 2, vibration table; 3, clamping assembly; 4, lifting assembly; 5, limit assembly; 101, mounting hole; 102, circular vertical plate; 103, circular placement table; 104, load-bearing spring; 201, circular support plate; 202, vibrator; 203, round iron sheet; 301, support column; 302, first rotating shaft; 303, first motor; 304, guide column; 305, second rotating shaft; 306, second motor; 307, connecting column; 308, third rotating shaft; 309, third motor; 310, connecting block; 311, circular magnetic block; 312, connecting rotating shaft; 313, arc-shaped clamping plate; 401, rectangular telescopic column; 402, rectangular telescopic sleeve; 403, cylinder; 404, first rotating shaft; 405, rotating column; 406, second rotating shaft; 501, L-shaped telescopic sleeve; 502, square telescopic column. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] See also Figure 1-3 The utility model provides an embodiment: a low-frequency vibration test structure, including a load-bearing base 1, a vibration table 2, a clamping assembly 3, a lifting assembly 4 and a limiting assembly 5; the upper end of the load-bearing base 1 is equipped with a vibration table 2 for placing a product to be tested and performing a performance test on the product in a low-frequency vibration environment, four groups of clamping assemblies 3 are installed around the outside of the load-bearing base 1 to reduce a certain degree of rebound of the vibration table 2 after reaching the maximum amplitude, and a limiting assembly 5 for telescopic adjustment according to the size of the product to be tested and fixing its position is arranged above the vibration table 2, and each of the outer corners of the limiting assembly 5 is equipped with a lifting and rotating device for adjusting the limiting assembly 5 and the lower A lifting assembly 4 is fixedly connected to the vibration table 2 at one end, and mounting holes 101 for bolts to pass through are opened at the corners of the load-bearing base 1. A circular vertical plate 102 is installed on the upper end of the load-bearing base 1, and a circular placement table 103 is installed on the upper end of the circular placement table 103. Load-bearing springs 104 are installed at the upper corners of the circular placement table 103, and a damper is provided inside the load-bearing spring 104. A circular support plate 201 fixedly connected to the load-bearing spring 104 is installed at the lower end edge of the vibration table 2, a vibrator 202 (the model of the vibrator 202 is KD2306) is installed in the middle of the lower end of the vibration table 2, and four groups of circular iron sheets 203 are installed around the outside of the vibration table 2.

[0024] See also Figure 4-5In this embodiment, the clamping assembly 3 includes a support column 301, a first rotating shaft 302, a first motor 303, a guide column 304, a second rotating shaft 305, a second motor 306, a connecting column 307, a third rotating shaft 308, a third motor 309, a connecting block 310, a circular magnetic block 311, a connecting rotating shaft 312 and an arc-shaped clamping plate 313. The first rotating shaft 302 is installed at one end of the support column 301 away from the circular vertical plate 102, and the first motor 303 is installed on one side of the first rotating shaft 302. The guide column 304 is rotatably connected to the support column 301 through the first rotating shaft 302. The guide column A second rotating shaft 305 is installed at one end of the guide column 304 away from the first rotating shaft 302, a second motor 306 is installed on one side of the second rotating shaft 305, a connecting column 307 is rotatably connected to the guide column 304 through the second rotating shaft 305, a third rotating shaft 308 is installed at one end of the connecting column 307 away from the second rotating shaft 305, a third motor 309 is installed on one side of the third rotating shaft 308, a connecting block 310 is rotatably connected to the connecting column 307 through the third rotating shaft 308, a circular magnetic block 311 is installed in the middle of one side of the connecting block 310 away from the third rotating shaft 308, and the upper and lower ends of the connecting block 310 are symmetrically installed with The connecting shaft 312 has a driver installed at one end of the connecting shaft 312. The arc clamping plate 313 is rotatably connected to the connecting block 310 through the connecting shaft 312. The lifting assembly 4 includes a rectangular telescopic column 401, a rectangular telescopic sleeve 402, a cylinder 403, a first rotating shaft 404, a rotating column 405, and a second rotating shaft 406. The rectangular telescopic sleeve 402 is internally sleeved with a rectangular telescopic column 401. The upper end of the rectangular telescopic sleeve 402 is installed with a cylinder 403. The end of the rectangular telescopic sleeve 402 away from the rectangular telescopic column 401 is installed with the first rotating shaft 404. The rotating column 405 is connected to the connecting block 310 through the connecting shaft 312. The moving shaft 404 is rotatably connected to the rectangular telescopic sleeve 402, and the second rotating shaft 406 is installed at one end of the rotating column 405 away from the first rotating shaft 404. A driver (the model of the driver is AQMD6030BLS-E3) is installed on one side of the first rotating shaft 404 and the second rotating shaft 406. The limiting component 5 includes an L-shaped telescopic sleeve 501 and a square telescopic column 502. Four groups of L-shaped telescopic sleeves 501 are arranged around, and a square telescopic column 502 is sleeved and connected between every two groups of L-shaped telescopic sleeves 501. The L-shaped telescopic sleeve 501 is rotatably connected to the rotating column 405 through the second rotating shaft 406.

[0025] When working, the load-bearing base 1 is fixedly connected to the ground through bolts passing through the mounting hole 101, and then the sensor (the sensor model is IV3-600CA) is installed on the product to be tested, and the product to be tested is placed on the vibration table 2. According to the height of the product to be tested, the rectangular telescopic sleeve 402 is moved to a suitable height along the rectangular telescopic column 401 by the drive of the cylinder 403. Then, according to the size of the product to be tested, the rotating column 405 is rotatably connected to the rectangular telescopic sleeve 402 through the first rotating shaft 404 by the drive of the driver. At the same time, the L-shaped telescopic sleeve 501 is rotatably connected to the rotating column 405 through the second rotating shaft 406 by the drive of the driver, so that the L-shaped telescopic sleeve 501 always maintains a horizontal state. In this process, the square telescopic column 502 is contracted along the L-shaped telescopic sleeve 501 to limit and fix the product to be tested, so as to avoid movement during low-frequency vibration testing, thereby affecting the test results and improving the accuracy of the test;

[0026] After the product to be tested is fixed, according to the position of the edge of the vibration table 2, the guide column 304 is driven by the first motor 303 to rotate to a suitable angle with the support column 301 through the first rotating shaft 302, and then driven by the second motor 306, the connecting column 307 is rotated to a suitable angle with the guide column 304 through the second rotating shaft 305, and then driven by the third motor 309, the connecting block 310 is rotated to a suitable angle with the connecting column 307 through the third rotating shaft 308, until the circular magnetic block 311 is fitted and connected with the circular iron sheet 203 for preliminary positioning, and finally driven by the driver, the arc clamping plate 313 is rotatably connected with the connecting block 310 through the connecting rotating shaft 312, and the edge of the vibration table 2 is clamped to reduce a certain degree of rebound generated after the vibration table 2 reaches the maximum amplitude, thereby reducing the lower limit frequency of the vibration table 2;

[0027] After everything is fixed, adjust the parameters of the vibration table 2 to simulate various low-frequency vibration environments. Then, driven by the vibrator 202, the product to be tested begins to vibrate at a low frequency along with the load-bearing spring 104. The vibration response of the product is monitored within the operating frequency range of the sensor, and the monitored data is transmitted to the data acquisition system for analysis and processing.

[0028] Through the above steps, after the product to be tested is fixed, according to the position of the edge of the vibration table 2, the guide column 304 is driven by the first motor 303 to rotate to a suitable angle with the support column 301 through the first shaft 302, and then driven by the second motor 306, the connecting column 307 is rotated to a suitable angle with the guide column 304 through the second shaft 305, and then driven by the third motor 309, the connecting block 310 is rotated to a suitable angle with the connecting column 307 through the third shaft 308, until the circular magnetic block 311 is fitted and connected with the circular iron sheet 203 for preliminary positioning, and finally driven by the driver, the arc clamping plate 313 is rotatably connected with the connecting block 310 through the connecting shaft 312, and the edge of the vibration table 2 is clamped to reduce a certain degree of rebound generated after the vibration table 2 reaches the maximum amplitude, thereby reducing the lower limit frequency of the vibration table 2.

[0029] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A low-frequency vibration test structure, comprising a load-bearing base (1); characterized in that: The invention also comprises a vibration table (2), a clamping assembly (3), a lifting assembly (4) and a limiting assembly (5); the upper end of the load-bearing base (1) is provided with a vibration table (2) for placing a product to be tested and performing a performance test on the product in a low-frequency vibration environment; four groups of clamping assemblies (3) are installed around the outside of the load-bearing base (1) for reducing a certain degree of rebound of the vibration table (2) after reaching a maximum amplitude; a limiting assembly (5) is provided above the vibration table (2) for performing telescopic adjustment according to the size of the product to be tested and fixing its position; and lifting assemblies (4) are installed at the outer corners of the limiting assembly (5) for lifting and rotating the limiting assembly (5) and the lower end of which is fixedly connected to the vibration table (2).

2. A low-frequency vibration test structure according to claim 1, characterized in that: The upper corners of the load-bearing base (1) are each provided with a mounting hole (101) for passing a bolt, the upper end of the load-bearing base (1) is provided with a circular vertical plate (102), the upper end of the circular vertical plate (102) is provided with a circular placement platform (103), the upper corners of the circular placement platform (103) are each provided with a load-bearing spring (104), and a damper is provided inside the load-bearing spring (104).

3. A low-frequency vibration test structure according to claim 2, characterized in that: A circular support plate (201) fixedly connected to a load-bearing spring (104) is installed at the lower edge of the vibration table (2), a vibrator (202) is installed in the middle of the lower end of the vibration table (2), and four groups of circular iron sheets (203) are installed around the outside of the vibration table (2).

4. A low-frequency vibration test structure according to claim 2, characterized in that: The clamping assembly (3) comprises a support column (301), a first rotating shaft (302), a first motor (303), a guide column (304), a second rotating shaft (305), a second motor (306), a connecting column (307), a third rotating shaft (308), a third motor (309), a connecting block (310), a circular magnetic block (311), a connecting rotating shaft (312) and an arc-shaped clamping plate (313), wherein the first rotating shaft (302) is installed at one end of the support column (301) away from the circular vertical plate (102), and the first motor (303) is installed at one side of the first rotating shaft (302).

5. A low-frequency vibration test structure according to claim 4, characterized in that: The guide column (304) is rotatably connected to the support column (301) via the first rotating shaft (302); a second rotating shaft (305) is installed at one end of the guide column (304) away from the first rotating shaft (302); a second motor (306) is installed on one side of the second rotating shaft (305); a connecting column (307) is rotatably connected to the guide column (304) via the second rotating shaft (305); a third rotating shaft (308) is installed at one end of the connecting column (307) away from the second rotating shaft (305); a third motor (309) is installed on one side of the third rotating shaft (308).

6. A low-frequency vibration test structure according to claim 4, characterized in that: The connecting block (310) is rotatably connected to the connecting column (307) via the third rotating shaft (308); a circular magnetic block (311) is installed in the middle of a surface of the connecting block (310) away from the third rotating shaft (308); connecting rotating shafts (312) are symmetrically installed at the upper and lower ends of the connecting block (310); a driver is installed at one end of the connecting rotating shaft (312); and an arc-shaped clamping plate (313) is rotatably connected to the connecting block (310) via the connecting rotating shaft (312).

7. A low-frequency vibration test structure according to claim 1, characterized in that: The lifting assembly (4) comprises a rectangular telescopic column (401), a rectangular telescopic sleeve (402), a cylinder (403), a first rotating shaft (404), a rotating column (405) and a second rotating shaft (406); the rectangular telescopic sleeve (402) is sleeved with the rectangular telescopic column (401); the upper end of the rectangular telescopic sleeve (402) is provided with the cylinder (403); the end of the rectangular telescopic sleeve (402) away from the rectangular telescopic column (401) is provided with the first rotating shaft (404); the rotating column (405) is rotatably connected to the rectangular telescopic sleeve (402) via the first rotating shaft (404); the end of the rotating column (405) away from the first rotating shaft (404) is provided with the second rotating shaft (406); and a driver is provided on one side of each of the first rotating shaft (404) and the second rotating shaft (406).

8. A low-frequency vibration test structure according to claim 7, characterized in that: The limiting assembly (5) comprises an L-shaped telescopic sleeve (501) and a square telescopic column (502). Four groups of L-shaped telescopic sleeves (501) are arranged around the sleeves. A square telescopic column (502) is sleeved and connected between every two groups of L-shaped telescopic sleeves (501). The L-shaped telescopic sleeve (501) is rotatably connected to the rotating column (405) via a second rotating shaft (406).

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