Self-adaptive bearing vibration table

Abstract

The utility model provides a self-adaptive bearing vibration table which comprises a vibration table top, an actuator, a workbench and a control unit which are sequentially arranged, the actuator is installed on the workbench, a plurality of bearing assemblies are arranged between the vibration table top and the workbench, each bearing assembly comprises an air spring and an air chamber, the air springs are connected with and support the vibration table top, and the air chambers are connected with the vibration table top. The air chamber is installed on the workbench and used for supporting the air spring and supplying air into the air spring or exhausting air from the air spring. The number of the bearing assemblies is not less than three, and the bearing assemblies are evenly distributed in the circumferential direction with the actuator as the center. A central force sensor is arranged between the actuator and the vibration table surface and is used for detecting the force of the vibration table surface to the actuator; an edge force sensor is arranged between the air spring and the vibration table surface and is used for detecting the force of the vibration table surface to the air spring; the control unit is used for acquiring data of the center force sensor and the edge force sensor and controlling the air chamber to inflate and deflate the air spring; adaptive balance mode switching can be carried out, different vibration test requirements are met, and the test capability and the control precision are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration test benches, and particularly relates to an adaptive bearing vibration table. Background Art

[0002] Vibration test is a typical test in environmental mechanics tests, and is widely used for mechanical simulation verification and reliability verification of automotive parts, aerospace products, etc.

[0003] In vibration tests, low-frequency large-displacement and high-frequency small-displacement are two common vibration modes. The acceleration value of low-frequency large-displacement vibration is relatively small, and it is mainly used to simulate low-frequency vibration and impact conditions in actual working conditions, and is often used to evaluate the structural strength and fatigue life of products; the acceleration value of high-frequency small-displacement is relatively large, and it can generate a strong impact effect, and is used to simulate high-frequency vibration environments, such as the anti-seismic test of electronic products, to detect the dynamic performance and reliability of products. In the case of large-table and large-load vertical vibration tests, air springs are often used for bearing support. Since the mass of the table and the load is generally much larger than the mass of the output end of the excitation generator, this mass difference may cause a significant reduction in vibration transfer efficiency, which may in turn cause equipment damage and have an adverse impact on key parameters such as the stroke, frequency, and acceleration of vibration, resulting in deviations in the vibration effects of low-frequency large-displacement or high-frequency small-displacement. Summary of the Invention

[0004] The purpose of the utility model is to provide an adaptive bearing vibration table to solve the above problems.

[0005] The technical solution adopted by the utility model is as follows:

[0006] An adaptive bearing vibration table, comprising a vibration tabletop, an actuator, a workbench, and a control unit arranged in sequence. The actuator is installed on the workbench, and the actuator is used to provide a vibration force to the vibration tabletop. A plurality of bearing components are arranged between the vibration tabletop and the workbench. The bearing components include air springs and air chambers. The air springs are connected to and support the vibration tabletop. The air chambers are installed on the workbench, and the air chambers are used to support the air springs and supply or extract air into the air springs; the number of the bearing components is not less than 3, and a plurality of the bearing components are circumferentially and evenly distributed around the actuator; a central force sensor is arranged between the actuator and the vibration tabletop, and the central force sensor is used to detect the force of the vibration tabletop on the actuator; a side force sensor is arranged between the air spring and the vibration tabletop, and the side force sensor is used to detect the force of the vibration tabletop on the air spring; the control unit is used to acquire the data of the central force sensor and the side force sensor and control the air chamber to charge and discharge the air spring.

[0007] As a further improved technical solution of the present utility model, there are four load-bearing components, which are respectively arranged at the four corners of the vibration tabletop, and the actuator is arranged at the center of the vibration tabletop.

[0008] As a further improved technical solution of the present utility model, a top cover is provided at the top of the air chamber, a base is provided at the bottom of the air chamber, the air spring is installed on the top cover, and the air chamber is installed on the workbench through the base.

[0009] As a further improved technical solution of the present utility model, a force transmission plate is arranged between the air spring and the side force sensor.

[0010] As a further improved technical solution of the present utility model, a retaining ring is arranged between the force transmission plate and the air spring, and a retaining ring is arranged between the air spring and the air chamber.

[0011] As a further improved technical solution of the present utility model, there are two air springs in each load-bearing component.

[0012] As a further improved technical solution of the present utility model, the two air springs are arranged in an overlapping manner in the movement direction of the vibration tabletop.

[0013] As a further improved technical solution of the present utility model, a retaining ring is arranged between the two air springs.

[0014] As a further improved technical solution of the present utility model, the vibration tabletop has an inverted frustum-shaped structure, and the actuator is a hydraulic actuator.

[0015] As a further improved technical solution of the present utility model, a pressure sensor is arranged at each air chamber, and the pressure sensor is used to detect the pressure value in the air chamber.

[0016] The beneficial effects of the present utility model are as follows:

[0017] Through the above structure, the switching of the adaptive balance mode can be carried out, different vibration test requirements can be realized, the influence on the effective dynamic thrust of the actuator can be prevented, and the vibration ability, vibration precision and operation safety and reliability can be improved. Description of the Drawings

[0018] Figure 1 It is the front view of the adaptive load-bearing vibration table;

[0019] Figure 2 It is the three-dimensional view of the adaptive load-bearing vibration table;

[0020] Figure 3 It is the structural schematic diagram of the adaptive load-bearing vibration table with a pressure sensor.

[0021] Wherein: 1 - vibration tabletop, 2 - actuator, 3 - workbench, 4 - air spring, 5 - air chamber, 6 - central force sensor, 7 - side force sensor, 8 - top cover, 9 - base, 10 - force transfer plate, 11 - retaining ring, 12 - pressure sensor. Specific embodiments

[0022] The following will describe the present utility model in detail in conjunction with the specific embodiments shown in the drawings. However, these embodiments do not limit the present utility model, and any structural, method, or functional transformation made by those of ordinary skill in the art based on these embodiments is included within the protection scope of the present utility model.

[0023] If the present utility model involves directions (such as up, down, left, right, front, back, outside, inside, etc.) during the description, then the involved directions need to be defined. For example, "To clearly express the positions and directions described within the present utility model, with the instrument operator as a reference, the end closer to the operator is the proximal end, and the end farther from the operator is the distal end." Or define it with reference to the paper surface, etc. Of course, if the positional relationship between the two is defined by mutual reference during subsequent descriptions, then it may not be defined here.

[0024] An adaptive load-bearing vibration table, as Figures 1-2 shown, includes a vibration tabletop 1, an actuator 2, a workbench 3, and a control unit arranged in sequence. The actuator 2 is installed on the workbench 3, and the actuator 2 is used to provide a vibration force to the vibration tabletop 1. A plurality of load-bearing components are arranged between the vibration tabletop 1 and the workbench 3. The load-bearing components include an air spring 4 and an air chamber 5. The air spring 4 is connected to and supports the vibration tabletop 1. The air chamber 5 is installed on the workbench 3. The air chamber 5 is used to supply or extract air into the air spring 4, and the air chamber 5 is also used to support the air spring 4; there are no less than 3 load-bearing components, and a plurality of the load-bearing components are circumferentially evenly distributed with the actuator 2 as the center; a central force sensor 6 is arranged between the actuator 2 and the vibration tabletop 1, and the central force sensor 6 is used to detect the force of the vibration tabletop 1 on the actuator 2; a side force sensor 7 is arranged between the air spring 4 and the vibration tabletop 1, and the side force sensor 7 is used to detect the force of the vibration tabletop 1 on the air spring 4; the control unit is used to acquire the data of the central force sensor 6 and the side force sensor 7 and control the air chamber 5 to charge and discharge the air spring 4.

[0025] As an embodiment of the present utility model, there are four load-bearing components, which are respectively arranged at the four corners of the vibration tabletop 1. A side force sensor 7 is arranged between the air spring 4 of each load-bearing component and the vibration tabletop 1, and the actuator 2 is arranged at the center of the vibration tabletop 1.

[0026] As an embodiment of the present utility model, an air chamber 5 is provided between the air spring 4 and the vibration tabletop 1. An external air source inflates the air chamber 5 to form the air chamber 5. A top cover 8 is provided at the top of the air chamber 5, and a base 9 is provided at the bottom of the air chamber 5. The air spring 4 is installed on the top cover 8, and the air chamber 5 is installed on the workbench 3 through the base 9.

[0027] As an embodiment of the present utility model, a force transmission plate 10 is provided between the air spring 4 and the side force sensor 7, and the vibration force can be evenly transmitted through the force transmission plate 10.

[0028] As an embodiment of the present utility model, a retaining ring 11 is provided between the force transmission plate 10 and the air spring 4, and a retaining ring 11 is provided between the air spring 4 and the air chamber 5. The provision of the retaining ring 11 ensures that the air spring 4 can be stably installed and fixed, preventing it from displacing or falling off during operation; it can also adjust and support the working state of the air spring 4, protecting the air spring 4 from external impacts and abrasions; at the same time, it seals the connection of the air spring 4 to prevent gas leakage and ensure the normal operation of the air spring 4.

[0029] As an embodiment of the present utility model, there are two air springs 4 in each load-bearing assembly, and the two air springs 4 are arranged in a stacked manner in the movement direction of the vibration tabletop 1. A retaining ring 11 is provided between the two air springs 4. The stacked air springs 4 can better absorb high-frequency vibrations, have stronger sound insulation effects, and adapt to a wider load range, and can also maintain a stable working state under complex working conditions. In practical applications, the number of the air springs 4 can be increased or decreased. By increasing or decreasing the number and strength of the air springs 4, the stiffness, height, internal volume of the cavity, and load-bearing capacity of the air springs 4 can be flexibly adjusted. The two stacked air springs 4 can achieve more precise adjustment by adjusting the pressure and volume of the whole or individual air springs 4, without replacing the entire spring system, better controlling the vibration amplitude and vibration load of the equipment, and improving the stability and reliability of the equipment.

[0030] As an embodiment of the present utility model, the vibration tabletop 1 has an inverted frustum-shaped structure, and the actuator 2 is a hydraulic actuator 2. This enhances the structural strength of the vibration tabletop 1 and increases the anti-overturning ability of the vibration system.

[0031] The working mode of the present utility model is as follows:

[0032] When a low-frequency large-displacement and small-thrust vibration test is required, the actuator 2 needs to transfer a large displacement to the vibration table 1. Therefore, in order to achieve a large displacement of the vibration table 1, the pressure on the air spring 4 needs to be minimized. During the large-displacement vibration of the vibration table 1, the differential pressure change of the air spring 4 is small, and the control accuracy is improved. Therefore, the actuator 2 needs to undertake the function of bearing the load, that is, the central force sensor 6 undertakes the function of bearing the load. Therefore, the control unit controls the air chamber 5 to reduce the air pressure of the air spring 4 in the load-bearing assembly. During operation, the control unit obtains the values of the central force sensor 6 and the side force sensor 7. Subsequently, the control unit controls each air chamber 5 to adjust the air pressure of the air spring 4 in each load-bearing assembly to change the bearing capacity of the air spring 4 until the value of the side force sensor 7 is zero. At this time, the mass of the load is completely supported by the actuator 2, and the load-bearing assembly is not subjected to tensile or compressive forces, realizing the function of adaptive load-bearing.

[0033] When a high-frequency small-displacement and large-thrust vibration test is required, the actuator 2 needs to provide a large vibration force to the vibration table 1. Therefore, the air spring 4 needs to undertake the function of bearing the load, that is, the side force sensor 7 undertakes the function of bearing the load. The control unit controls the air chamber 5 to increase the air pressure of the air spring 4 in the load-bearing assembly. At this time, the thrust of the actuator 2 will all be used to generate the vibration force. During operation, the control unit obtains the values of the central force sensor 6 and the side force sensor 7. Subsequently, the control unit controls each air chamber 5 to adjust the air pressure of the air spring 4 in each load-bearing assembly to change the bearing capacity of the air spring 4 until the value of the central force sensor 6 is zero. At this time, the mass of the load is completely supported by each air spring 4, and the actuator 2 is not subjected to tensile or compressive forces, realizing the function of adaptive load-bearing.

[0034] The adaptive load-bearing vibration table provided by the present utility model can switch the adaptive load-bearing mode by setting the load-bearing assembly, the side force sensor 7 and the central force sensor 6, realize the adaptive balance adjustment of the load gravity, prevent affecting the effective dynamic thrust of the actuator 2, and improve the vibration ability, test accuracy and operation safety and reliability.

[0035] As an embodiment of the present utility model, as Figure 3 shown, a pressure sensor 12 is provided at each air chamber 5, and the pressure sensor 12 is used to detect the pressure value in the air chamber 5. This setting can also be applied to high-frequency small-displacement and large-thrust vibration tests.

[0036] It should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0037] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present utility model, and they are not intended to limit the protection scope of the present utility model. Any equivalent embodiments or changes made without departing from the technical spirit of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An adaptive load-bearing vibration table, characterized in that: The invention comprises a vibration table (1), an actuator (2), a workbench (3) and a control unit which are arranged in sequence, wherein the actuator (2) is mounted on the workbench (3), and the actuator (2) is used to provide vibration force to the vibration table (1). A plurality of bearing components are arranged between the vibration table (1) and the workbench (3), and the bearing components comprise an air spring (4) and an air chamber (5). The air spring (4) is connected to and supports the vibration table (1), and the air chamber (5) is mounted on the workbench (3), and the air chamber (5) is used to support the air spring (4) and supply or exhaust air into the air spring (4); the bearing components There are no less than 3 bearing assemblies, and the bearing assemblies are evenly distributed around the actuator (2) as the center; a center force sensor (6) is arranged between the actuator (2) and the vibration table (1), and the center force sensor (6) is used to detect the force of the vibration table (1) on the actuator (2); a side force sensor (7) is arranged between the air spring (4) and the vibration table (1), and the side force sensor (7) is used to detect the force of the vibration table (1) on the air spring (4); the control unit is used to obtain data from the center force sensor (6) and the side force sensor (7) and to control the air chamber (5) to inflate and deflate the air spring (4).

2. The adaptive load-bearing vibration table according to claim 1, characterized in that: There are four bearing components, which are respectively arranged at the four corners of the vibration table (1), and the actuator (2) is arranged at the center of the vibration table (1).

3. The adaptive load-bearing vibration table according to claim 1, characterized in that: A top cover (8) is arranged on the top of the air chamber (5), a base (9) is arranged on the bottom of the air chamber (5), the air spring (4) is mounted on the top cover (8), and the air chamber (5) is mounted on the workbench (3) via the base (9).

4. The adaptive load-bearing vibration table according to claim 1, characterized in that: A force transmission plate (10) is arranged between the air spring (4) and the edge force sensor (7).

5. The adaptive load-bearing vibration table according to claim 4, characterized in that: A pressure ring (11) is arranged between the force transmission plate (10) and the air spring (4), and a pressure ring (11) is arranged between the air spring (4) and the air chamber (5).

6. The adaptive load-bearing vibration table according to claim 5, characterized in that: There are two air springs (4) in each bearing assembly.

7. The self-adaptive load-bearing vibration table according to claim 6, characterized in that: The two air springs (4) are arranged superimposed on each other in the movement direction of the vibration table (1).

8. The self-adaptive load-bearing vibration table according to claim 7, characterized in that: A pressure ring (11) is arranged between the two air springs (4).

9. The self-adaptive load-bearing vibration table according to claim 1, characterized in that: The vibration table surface (1) is an inverted prism-shaped structure, and the actuator (2) is a hydraulic actuator (2).

10. The self-adaptive load-bearing vibration table according to claim 1, characterized in that: A pressure sensor (12) is provided at each of the air chambers (5), and the pressure sensor (12) is used to detect the pressure value in the air chamber (5).

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