Device for detecting mounting resonant frequency of accelerometer

Abstract

The utility model discloses a device for detecting the installation resonant frequency of an accelerometer, which is matched with an accelerometer to be detected for use, the device for detecting the installation resonant frequency of the accelerometer comprises a pneumatic assembly, a suspension assembly and a working table, the pneumatic assembly comprises a pneumatic mechanism and a moving mechanism, the moving mechanism is arranged between the pneumatic mechanism and the suspension assembly, and the working table is arranged between the pneumatic mechanism and the suspension assembly. The pneumatic mechanism comprises an air cylinder and a speed regulating valve, the speed regulating valve comprises a first valve body and a second valve body, the moving mechanism comprises a connecting plate, an impact rod and a sliding rail, the suspension assembly comprises a suspension support and a suspension rope, one end of the suspension rope is rotationally connected with the suspension support, the other end of the suspension rope is fixedly connected with a steel anvil, and a to-be-tested accelerometer is arranged on the side, opposite to the impact rod, of the steel anvil. The accelerometer to be tested is electrically connected with the oscilloscope; the device is simple to operate and convenient to maintain, and effectively solves the problem of detection of the installation resonant frequency of the impact acceleration.

Description

Technical Field

[0001] The utility model relates to the field of microelectromechanical technology, and particularly to a detection device for the installation resonance frequency of an accelerometer. Background Art

[0002] An accelerometer is usually used in combination with an adapter (such as a charge amplifier) for measuring vibration and shock acceleration. It mainly consists of a mass block, a piezoelectric sensitive element, a base, etc., where the piezoelectric sensitive element is a quartz crystal or a piezoelectric ceramic, etc.

[0003] The accelerometer works based on the positive piezoelectric effect of the piezoelectric sensitive element, that is: when the accelerometer is fixed on the vibrating object to be measured, the piezoelectric element is subjected to the inertial force of the mass block, generating a charge proportional to the applied force, and this charge is proportional to the acceleration of the mass block. When the measured vibration frequency is much lower than the natural frequency of the accelerometer vibration system, the amount of charge generated by the accelerometer sensitive element is proportional to the absolute acceleration value of the accelerometer base. Therefore, the instantaneous value of the output electric quantity of the accelerometer is proportional to the instantaneous value of the mechanical vibration acceleration it senses.

[0004] Currently, there is a lack of an effective device for detecting the installation resonance frequency of shock acceleration. Summary of the Utility Model

[0005] In view of the above situation, it is necessary to provide a detection device for the installation resonance frequency of an accelerometer to address the problem of the lack of a device for detecting the installation resonance frequency of shock acceleration in the prior art.

[0006] A detection device for the installation resonance frequency of an accelerometer, which is used in cooperation with the accelerometer to be measured. The detection device for the installation resonance frequency of the accelerometer includes a pneumatic component, a suspension component and a workbench. The pneumatic component and the suspension component are respectively arranged on opposite sides of the workbench. The pneumatic component includes a pneumatic mechanism and a moving mechanism. The moving mechanism is arranged between the pneumatic mechanism and the suspension component. The pneumatic mechanism includes a cylinder and a speed regulating valve. The cylinder is arranged on a first base, and the first base is arranged on the workbench. The output end of the cylinder is used to drive the moving mechanism to move. The speed regulating valve includes a first valve body and a second valve body. The first valve body and the second valve body are respectively arranged on the upper parts of both ends of the cylinder. The first valve body and the second valve body are communicated with the cylinder. The first valve body and the second valve body are used to control the external air source to enter the cylinder. The moving mechanism includes a connecting plate, an impact rod and a slide rail. The output end of the cylinder is connected to one end of the connecting plate. The end of the connecting plate far from the cylinder is connected to the impact rod. The connecting plate is movably connected with the slide rail. The slide rail is arranged below the connecting plate and on the side of the first base far from the cylinder. The suspension component includes a suspension bracket and a suspension rope. The suspension bracket is arranged on the workbench. One end of the suspension rope is rotatably connected to the suspension bracket. The other end of the suspension rope is fixedly connected to an anvil. The anvil corresponds to the position of the impact rod. The accelerometer to be measured is arranged on the side of the anvil facing away from the impact rod. The accelerometer to be measured is electrically connected to an oscilloscope. The oscilloscope is arranged on one side of the workbench and adjacent to the accelerometer to be measured.

[0007] Advantages of the present utility model:

[0008] By using a torque wrench, the accelerometer to be measured is installed on the anvil to reach the specified installation torque, and the anvil is suspended on the suspension rope. The first valve body is controlled to intake air and the second valve body is controlled to exhaust air by an external air change valve, so that the cylinder pushes the connecting rod to move towards the anvil. Finally, the impact rod knocks the anvil to instantaneously generate an impact force. By using the method of transfer function, the installation resonance frequency of the accelerometer is obtained, and the transfer function of the instantaneous value of the electric quantity can be amplified by a charge amplifier and then transmitted to the oscilloscope for display, and the relevant data of the installation resonance frequency can be read in the form of an image. The second valve body is controlled to intake air and the first valve body is controlled to exhaust air by an external air change valve, so that the cylinder drives the connecting rod to move away from the anvil, and the accelerometer to be measured is removed and replaced with the next accelerometer to be measured for detection.

[0009] Further, a limiting groove is provided at the upper end of the second bracket. The limiting groove is used to limit the anvil. A slider is provided at the lower end of the connecting plate. A chute is formed by concave inward on one side of the slide rail. The slider is adapted to the chute.

[0010] Further, the suspension bracket includes a fixing member, a first bracket, and a second bracket arranged from top to bottom. One end of the suspension rope is fixedly connected to the fixing member, and the other end of the suspension rope passes through the first bracket and the second bracket and is connected to the anvil.

[0011] Further, the first bracket is arched to form a receiving space for receiving the swinging suspension rope.

[0012] Further, a limiting groove is provided at the upper end of the second bracket for limiting the swinging amplitude of the suspension rope. The limiting groove is provided at the upper end of the second bracket for limiting the swinging amplitude of the suspension rope.

[0013] Further, one end of the impact rod facing the anvil is arc-shaped. The impact rod is screwed to the connecting plate, and one side of the anvil facing the impact rod is arc-shaped.

[0014] Further, the workbench is fixedly provided with a second base, and the first base and the second bracket are fixedly arranged on the second base. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the first embodiment of the present invention;

[0016] Figure 2 is a side view of the first embodiment of the present invention.

[0017] Reference numerals: 1, pneumatic assembly; 11, pneumatic mechanism; 111, cylinder; 112, speed control valve; 112, first valve body; 1122, second valve body; 12, moving mechanism; 121, connecting plate; 1211, slider; 122, impact rod; 123, slide rail; 2, suspension assembly; 21, suspension bracket; 211, fixing member; 212, first bracket; 2121, receiving space; 213, second bracket; 2131, limiting groove; 22, suspension rope; 23, anvil; 24, accelerometer; 3, workbench; 31, first base; 32, second base. Detailed Embodiments

[0018] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0019] It should be noted that when an element is referred to as being "fixedly provided on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are only for the purpose of illustration.

[0020] Unless otherwise defined, all technical and scientific terms used in this article have the same meaning as commonly understood by those skilled in the technical field to which this utility model belongs. The terms used in the description of this utility model in this article are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used in this article includes any and all combinations of one or more of the related listed items. Moreover, the various embodiments of this utility model, the features between the embodiments, and the features of the embodiments can be freely combined on the premise of no obvious conflict or contradiction.

[0021] A detection device for the installation resonance frequency of an accelerometer is used in cooperation with a to-be-detected accelerometer 24, as Figure 1 and Figure 2 shown. The detection device for the installation resonance frequency of the accelerometer includes a pneumatic component 1, a suspension component 2 and a workbench 3. The pneumatic component 1 and the suspension component 2 are respectively arranged on opposite sides of the workbench 3.

[0022] Specifically, the pneumatic component 1 includes a pneumatic mechanism 11 and a moving mechanism 12. The moving mechanism 12 is arranged between the pneumatic mechanism 11 and the suspension component 2. The pneumatic mechanism 11 includes a cylinder 111 and a speed control valve 112. The cylinder 111 is arranged on a first base 31, and the first base 31 is arranged on the workbench 3. The speed control valve 112 includes a first valve body 1121 and a second valve body 1122. The first valve body 1121 and the second valve body 1122 are respectively arranged on the upper parts of both ends of the cylinder 111. The first valve body 1121 and the second valve body 1122 are communicated with the cylinder 111. The first valve body 1121 and the second valve body 1122 are used to control the external air source to enter the cylinder 111. The output end of the cylinder 111 is used to drive the moving mechanism 12 to move.

[0023] The moving mechanism 12 includes a connecting plate 121, an impact rod 122, and a slide rail 123. The output end of the cylinder 111 is connected to one end of the connecting plate 121. The end of the connecting plate 121 away from the cylinder 111 is connected to the impact rod 122. The bottom of the connecting plate 121 is slidably connected to the slide rail 123. The slide rail 123 is disposed below the connecting plate 121. A slider 1211 is provided at the lower end of the connecting plate 121. A chute 1231 is formed by concaving one side of the slide rail 123. The slider 1211 is adapted to the chute 1231. The slide rail 123 is disposed on the side of the first base 31 away from the cylinder 111.

[0024] Specifically, the suspension assembly 2 includes a suspension bracket 21 and a suspension rope 22. One end of the suspension rope 22 is rotatably connected to the suspension bracket 21. The suspension bracket 21 includes a fixing member 211, a first bracket 212, and a second bracket 213 arranged from top to bottom. One end of the suspension rope 22 is fixedly connected to the fixing member 211. The other end of the suspension rope 22 passes through the first bracket 212 and the second bracket 213 and is connected to the anvil 23. The first bracket 212 is arched to form an accommodation space 2121 for accommodating the swinging suspension rope 22. A limiting groove 2131 is provided at the upper end of the second bracket 213 for limiting the swinging amplitude of the suspension rope 22. The anvil 23 is located on the axial movement path of the impact rod 122. A side of the anvil 23 facing away from the impact rod 122 is provided with the accelerometer under test 24. The accelerometer under test 24 is electrically connected to an oscilloscope (not shown). The oscilloscope is disposed on one side of the workbench 3 and adjacent to the accelerometer under test 24.

[0025] Specifically, one end of the impact rod 122 facing the anvil 23 is arc-shaped. The impact rod 122 is screwed to the connecting plate 121. One side of the anvil 23 facing the impact rod 122 is arc-shaped. The arc-shaped end of the impact rod 122 impacts the arc-shaped side of the anvil 23 to meet the installation resonance frequency of the accelerometer generated at the moment when the impact rod 122 drives the accelerometer under test 24 through the anvil 23.

[0026] Specifically, a second base 32 is fixedly provided on the workbench 3. The first base 31 and the second bracket 213 are fixedly provided on the second base 32.

[0027] The implementation process of the present utility model is as follows:

[0028] Install the accelerometer 24 to be measured on the steel anvil 23 with a torque wrench to reach the specified installation torque, and hang the steel anvil 23 on the suspension rope 22. Control the intake of the first valve body 1121 and the exhaust of the second valve body 1122 by using an external air change valve, so that the output end of the cylinder 111 moves towards the direction close to the steel anvil 23. Finally, the arc-shaped end of the impact rod 122 knocks on the arc-shaped side of the steel anvil 23 to instantaneously generate an impact force. The accommodating space 2121 is used to accommodate the swinging suspension rope 22, and the limiting groove 2131 limits the swinging amplitude of the steel anvil 23 driving the suspension rope 22. Obtain the installation resonance frequency of the accelerometer by the method of transfer function, and the transfer function of the instantaneous value of the electric quantity can be transmitted to the oscilloscope for display after being amplified by a charge amplifier, and the relevant data of the installation resonance frequency can be read in the form of an image; remove the accelerometer 24 to be measured, control the intake of the second valve body 1122 and the exhaust of the first valve body 1121 by using an external air change valve, so that the output end of the cylinder 111 moves away from the steel anvil 23, and replace it with the next accelerometer 24 to be measured for detection.

[0029] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0030] The above-described embodiments only express the implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A detection device for the resonant frequency of an accelerometer, used in conjunction with an accelerometer to be tested, characterized in that: The detection device for the resonant frequency of the accelerometer installation includes a pneumatic component, a suspension component and a workbench, the pneumatic component and the suspension component are respectively arranged on opposite sides of the workbench, the pneumatic component includes a pneumatic mechanism and a moving mechanism, the moving mechanism is arranged between the pneumatic mechanism and the suspension component, the pneumatic mechanism includes a cylinder and a speed regulating valve, the cylinder is arranged on a first base, the first base is arranged on the workbench, the output end of the cylinder is used to drive the moving mechanism to move, the speed regulating valve includes a first valve body and a second valve body, the first valve body and the second valve body are respectively arranged at the upper parts of the two ends of the cylinder, the first valve body and the second valve body are connected to the cylinder, the first valve body and the second valve body are used to control the external air source to enter the cylinder, The moving mechanism includes a connecting plate, an impact rod and a slide rail, the output end of the cylinder is connected to one end of the connecting plate, the end of the connecting plate away from the cylinder is connected to the impact rod, the connecting plate is movably connected to the slide rail, the slide rail is arranged below the connecting plate and is located on the side of the first base away from the cylinder, the suspension assembly includes a suspension bracket and a suspension rope, the suspension bracket is arranged on the workbench, one end of the suspension rope is rotatably connected to the suspension bracket, and the other end of the suspension rope is fixedly connected to a steel anvil, the steel anvil corresponds to the position of the impact rod, the side of the steel anvil facing away from the impact rod is provided with the accelerometer to be measured, the accelerometer to be measured is electrically connected to an oscilloscope, the oscilloscope is arranged on one side of the workbench and is adjacent to the accelerometer to be measured.

2. The device for detecting the resonant frequency of the accelerometer according to claim 1, characterized in that: A sliding block is provided at the lower end of the connecting plate, one side of the slide rail is concave to form a slide groove, and the sliding block is adapted to the slide groove.

3. The device for detecting the resonant frequency of the accelerometer according to claim 1, characterized in that: The suspension bracket includes a fixing member, a first bracket and a second bracket arranged from top to bottom. One end of the suspension rope is fixedly connected to the fixing member, and the other end of the suspension rope passes through the first bracket and the second bracket and is connected to the steel anvil.

4. The device for detecting the resonant frequency of the accelerometer according to claim 3, characterized in that: The first bracket is in an arched state to form an accommodating space, and the accommodating space is used to accommodate the swinging suspension rope.

5. The device for detecting the resonant frequency of the accelerometer according to claim 4, characterized in that: A limiting groove is provided at the upper end of the second bracket, and the limiting groove is used to limit the swing amplitude of the suspension rope.

6. The device for detecting the resonant frequency of an accelerometer according to claim 1, characterized in that: One end of the impact rod facing the steel anvil is arc-shaped, the impact rod is screwed to the connecting plate, and one side of the steel anvil facing the impact rod is arc-shaped.

7. The device for detecting the resonant frequency of the accelerometer according to claim 3, characterized in that: The workbench is fixedly provided with a second base, and the first base and the second bracket are fixedly provided on the second base.

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