CN103968938A - Vibrating frequency detecting device - Google Patents

Abstract

A vibration frequency detection device includes a casing, a piezoelectric buzzer piece and a vibrating piece. At least one side of the housing is open; the piezoelectric buzzer is used to convert mechanical deformation into an electrical signal, and the piezoelectric buzzer is connected to the housing and covers one of the openings to form a housing cavity with the housing; the vibrating element accommodates The piezoelectric buzzer is placed in the containing cavity, and the piezoelectric buzzer can be touched to cause mechanical deformation of the piezoelectric buzzer. The vibrating part can move in the containing cavity to change the deformation of the piezoelectric buzzer. When fine vibration occurs due to external influence, the vibrating part moves in the housing cavity and touches the piezoelectric buzzer. At this time, the piezoelectric buzzer is mechanically deformed by the force, and the mechanical deformation is converted into an electrical signal output. , the larger the deformation, the more obvious the change of the output electrical signal. Since the gravity of the vibrating part is fixed, the change of the electrical signal output by the piezoelectric buzzer matches the motion frequency of the vibrating part, that is, the fine vibration frequency, so as to realize the detection of fine vibration and improve the detection accuracy.

Description

Vibration frequency detection device

technical field

The invention relates to the technical field of vibration detection, in particular to a vibration frequency detection device.

Background technique

With the advancement of science and technology and the development of society, the detection of vibration frequency is widely used in real life. For example, electronic blood pressure monitors measure blood pressure by setting vibration frequency detection devices, and vibration detection devices are installed on large machinery to detect vibration during mechanical work. Frequency, which can prevent damage to machine precision caused by resonance, etc.

At present, the vibration frequency detection device usually adopts the acceleration sensor of the piezoelectric vibration element. When the force in the detection axis direction acts on the piezoelectric vibration element, the resonance frequency of the piezoelectric vibration element changes. According to the change of the resonance frequency, the detection The acceleration applied to the accelerometer. However, when the acceleration sensor is used to detect the vibration frequency, it cannot detect fine vibrations, resulting in low detection accuracy.

Contents of the invention

Based on this, it is necessary to provide a vibration frequency detection device that can improve the detection accuracy for the problem that the fine vibration cannot be detected, resulting in low detection accuracy.

A vibration frequency detection device, comprising

a housing open on at least one side;

a piezoelectric buzzer for converting mechanical deformation into an electrical signal, the piezoelectric buzzer is connected to the casing and covers one of the openings, so as to form a receiving cavity with the casing; and

The vibrating element is accommodated in the accommodation cavity and can touch the piezoelectric buzzer to cause mechanical deformation of the piezoelectric buzzer, and the vibration element can move in the accommodation cavity to Change the deformation of the piezoelectric buzzer.

In one embodiment, the housing includes two opposite side walls, and a top wall connected between the two side walls, and the top wall is opposite to the piezoelectric buzzer.

In one of the embodiments, the distance between the two side walls matches the size of the vibrating element between the two side walls, and the distance between the two side walls is smaller than the distance between the top wall and the piezoelectric element. Spacing between beep pieces.

In one of the embodiments, the vibrating element is spherical.

In one of the embodiments, the vibrating element is a steel ball.

In one of the embodiments, it further includes an amplifying circuit electrically connected to the piezoelectric buzzer, and the amplifier circuit is used to amplify the electrical signal outputted through the piezoelectric buzzer.

The above-mentioned vibration frequency detection device includes a housing, a piezoelectric buzzer and a vibrating element. At least one side of the housing has an opening. The piezoelectric buzzer is connected to the housing and covers one of the openings to form an accommodating cavity. The vibrating element It is accommodated in the accommodating cavity and is movable in the accommodating cavity. When fine vibration occurs due to external influence, the vibrating part moves in the housing cavity and touches the piezoelectric buzzer. At this time, the piezoelectric buzzer is mechanically deformed by the force, and the mechanical deformation is converted into an electrical signal output. , the larger the deformation, the more obvious the change of the output electrical signal. Since the gravity of the vibrating part is fixed, the change of the electrical signal output by the piezoelectric buzzer matches the motion frequency of the vibrating part, that is, the fine vibration frequency, so as to realize the detection of fine vibration and improve the detection accuracy.

Description of drawings

Fig. 1 is the structural representation of the vibration frequency detecting device of an embodiment;

FIG. 2 is a schematic circuit diagram of an amplifying circuit of a vibration frequency detection device according to an embodiment.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided for the purpose of making the disclosure of the present invention more thorough and comprehensive.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in FIG. 1 , a vibration frequency detection device includes a housing 110 , a piezoelectric buzzer 120 and a vibrating element 130 .

At least one side of the casing 110 is open. The piezoelectric buzzer 120 is used to convert mechanical deformation into an electrical signal. The piezoelectric buzzer 120 is connected to the casing 110 and covers one of the openings, and forms an accommodating cavity 140 with the casing 110 . In order to improve maintainability, the housing 110 and the piezoelectric buzzer 120 are detachably connected, such as by threaded connection. Of course, the casing 110 and the piezoelectric buzzer 120 can also be fixedly connected to achieve the purpose of forming the accommodating cavity 140 and the vibrating member 130 can touch the piezoelectric buzzer 120 .

The vibrating element 130 is accommodated in the housing cavity 140, and can touch the piezoelectric buzzer 120 to cause mechanical deformation of the piezoelectric buzzer 120, and the vibrating element 130 can move in the housing cavity 140 to change the piezoelectric buzzer. The amount of deformation of the sheet 120. When the vibrating member 130 moves in the receiving cavity 140 , in order to improve the contact pressure effect of the piezoelectric buzzer piece 120 , the receiving cavity 140 is sealed. Of course, the housing cavity 140 may not be completely closed, as long as the vibrating member 130 can move in the housing cavity 140 and touch the piezoelectric buzzer piece 120 .

When the above-mentioned vibration frequency detection device is affected by the outside and vibrates slightly, the vibrating member 130 moves in the housing cavity 140 and touches the piezoelectric buzzer 120. At this time, the piezoelectric buzzer 120 is subjected to a force to generate mechanical vibration. Deformation, and convert mechanical deformation into electrical signal output, the greater the deformation, the more obvious the change of the output electrical signal. Since the gravity of the vibrating element 130 is fixed, the change of the electrical signal output by the piezoelectric buzzer 120 matches the motion frequency of the vibrating element 130, that is, the fine vibration frequency, thereby realizing the detection of fine vibration and improving the detection accuracy.

In addition, the piezoelectric buzzer 120 is connected to the housing 110 and covers one of the openings. In this way, when the accommodating cavity 140 moves, the vibrating member 130 can directly contact the piezoelectric buzzer 120 for contact pressure, which is beneficial for the piezoelectric buzzer 120 to be sensed when a slight vibration occurs, and further improves the detection accuracy. precision. Moreover, the vibrating element 130 is accommodated in the receiving cavity 140 , and no additional fixing element is required to fix the vibrating element 130 , which is easy to install and has a long service life.

Please refer to FIG. 1 , in one embodiment, the housing 110 includes two opposite side walls 112 , and a top wall 114 connected between the two side walls 112 , the top wall 114 is opposite to the piezoelectric buzzer 120 set up. When vibration occurs, the vibrating member 130 moves, and is subjected to the rebound action of the side wall 112 and the top wall 114 to touch the piezoelectric buzzer 120, causing the piezoelectric buzzer 120 to produce mechanical deformation, and then obtained according to the converted voltage change. Subtle vibration frequency. It should be noted that the housing 110 may also be of other structures, as long as the vibrating member 130 can move in the accommodation cavity 140 and touch the piezoelectric buzzer piece 120 .

Please refer to FIG. 1 , in one embodiment, the distance between the two side walls 112 matches the size of the vibrating element 130 between the two side walls 112 , thereby preventing the vibrating element 130 from being parallel to the piezoelectric buzzer 120 direction movement. The distance between the two side walls 112 is smaller than the distance between the top wall 114 and the piezoelectric buzzer piece 120 . In this way, the two side walls 112 act as guides to provide the vibration direction path for the vibrating element 130, while the space between the top wall 114 and the piezoelectric buzzer piece 120 provides the vibrating element 130 with an active space, so that when the vibrating element 130 vibrates , can touch the piezoelectric buzzer 120 to ensure the accuracy of detecting subtle vibrations. In the specific embodiment shown in FIG. 1 , when the vibration frequency detecting device vibrates slightly due to external influences, the vibrating member 130 moves up and down.

Please refer to FIG. 1 , in one embodiment, the vibrating element 130 is spherical. Adopting a spherical shape, the vibrating element 130 is in point-to-surface contact with the housing cavity 140, the friction is small, and the resistance to the movement of the vibrating element 130 is small, which ensures that the vibrating element 130 can move when there is a slight vibration in the outside world, so that the piezoelectric buzzer The voltage change of the chip 120 improves the detection sensitivity. In this embodiment, the vibrating member 130 is a steel ball, and the steel material has a high density and a good contact pressure effect. Of course, the vibrating element 130 can also be an element made of other materials, as long as it can achieve the purpose of touching the piezoelectric buzzer piece 120 .

Please refer to Fig. 2, in one of the embodiments, the vibration frequency detection device includes an amplifying circuit 150, the amplifying circuit 150 is electrically connected with the piezoelectric buzzer 120, and the amplifying circuit 150 is used to amplify the voltage output by the piezoelectric buzzer 120 Signal. After the piezoelectric buzzer 120 is subjected to mechanical deformation, the electrical signal output by the piezoelectric buzzer 120 will also change significantly with the increase of the deformation, and the amplifier circuit 150 will amplify the electrical signal so that the vibration can be more accurate. is detected.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (6)

1. A vibration frequency detection device, characterized in that, comprising a housing open on at least one side; a piezoelectric buzzer for converting mechanical deformation into an electrical signal, the piezoelectric buzzer is connected to the casing and covers one of the openings, so as to form a receiving cavity with the casing; and The vibrating element is accommodated in the accommodation cavity and can touch the piezoelectric buzzer to cause mechanical deformation of the piezoelectric buzzer, and the vibration element can move in the accommodation cavity to Change the deformation of the piezoelectric buzzer. 2. The vibration frequency detection device according to claim 1, characterized in that, the housing comprises two oppositely arranged side walls, and a top wall connected between the two side walls, the top wall and the Piezoelectric buzzers are arranged oppositely. 3. The vibration frequency detection device according to claim 2, characterized in that, the distance between the two side walls matches the size of the vibrating element between the two side walls, and the distance between the two side walls The distance is smaller than the distance between the top wall and the piezoelectric buzzer piece. 4. The vibration frequency detection device according to claim 1, wherein the vibrating element is spherical. 5. The vibration frequency detection device according to claim 4, wherein the vibrating element is a steel ball. 6 . The vibration frequency detection device according to claim 1 , further comprising an amplifying circuit electrically connected to the piezoelectric buzzer, and the amplifying circuit is used to amplify the electrical signal output by the piezoelectric buzzer.