CN218600691U

CN218600691U - Passive vibration sensor

Info

Publication number: CN218600691U
Application number: CN202222989494.3U
Authority: CN
Inventors: 曹靖宇; 赵东良; 林英威
Original assignee: Feike Star Xiamen Technology Co ltd
Current assignee: Feike Star Xiamen Technology Co ltd
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-03-10
Anticipated expiration: 2032-11-07

Abstract

The passive vibration sensor comprises a shell, and a plurality of magnets and induction coils which are arranged in the shell, wherein the magnets are distributed along the inner wall of the shell in an annular array manner to form a closed magnetic field; the top of the shell is provided with a hole and a connector for suspending the induction coil, and the connector is externally connected with acquisition equipment and used for transmitting induction signals; the induction coil is arranged in the magnetic field, and the motion cutting magnetic induction line generates an electric signal for measuring vibration.

Description

Passive vibration sensor

Technical Field

The application relates to the technical field of electronic sensors, in particular to a passive vibration sensor.

Background

Buildings and bridges may encounter natural disasters such as earthquakes, typhoons and the like, and in order to guarantee life and property safety, harm monitoring and early warning are required to be carried out on the buildings and the bridges; in the mining research of geology and mining areas, the collapse risk caused by natural disasters or human errors often faces, and the geological metamorphosis also needs to be monitored and early warned; in the production and measurement field, some precision equipment is often used, in order to ensure the product quality or the measurement accuracy, strict requirements are imposed on the jitter generated in the operation process of the equipment, and several equipment are required to be subjected to vibration monitoring; therefore, a sensor with high sensitivity is needed to monitor the vibration, and after the sensor senses the vibration, the vibration is converted into an electric signal which can be recognized by a computer and is transmitted to acquisition equipment, so that the object to be detected is monitored.

The common vibration sensors on the market are mainly classified into three types: firstly, an active mechanical sensor which adopts conductors such as metal balls and mercury as a vibration switch; secondly, an active electronic sensor which measures acceleration and calculates vibration by adopting chips such as a gyroscope, an accelerometer and the like; and thirdly, a passive mechanical sensor which captures vibration or deformation to generate an electric signal by adopting a piezoelectric principle.

The first sensor has the advantages of simple structure, but has lower detection sensitivity and precision, needs a power line to supply power for the first sensor, and is not beneficial to installation and construction; the detection accuracy of the second sensor is improved compared with that of the first sensor, but the sensitivity is still low, and the sensor needs to be externally connected with power supply, so that the sensor is not beneficial to installation and construction. The third sensor has higher sensitivity, but the intensity and the precision of the feedback signal are not high, and the sensor has complex structure and higher cost.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the application provides a passive vibration sensor which realizes a high-precision and high-sensitivity measurement mode. The following technical scheme is adopted:

a passive vibration sensor comprises a shell, a plurality of magnets and induction coils, wherein the magnets and the induction coils are arranged in the shell;

the top of the shell is provided with a hole and a connector for suspending the induction coil, and the connector is externally connected with acquisition equipment for transmitting induction signals;

the induction coil is placed in the magnetic field to move to cut the magnetic induction line to generate an electric signal for measuring vibration.

Optionally, the magnet is a permanent magnet.

Optionally, the magnet is a neodymium iron boron magnet.

Optionally, a base is fixedly mounted at the bottom of the shell, and a cylindrical magnet framework is arranged on the base towards the inside of the shell;

the magnet framework and the inner wall of the shell form a gap along the circumferential direction, and the magnet is embedded into the gap.

Optionally, the base is provided with a screw hole for installation and fixation on the object to be measured.

Optionally, the housing and the base are made of aluminum alloy.

Optionally, the induction coil is a metal spring coil, and is coaxially arranged with the magnet frame.

Optionally, the connector is a BNC plug.

To sum up, the present application includes the following beneficial effects:

1. this sensor is passive sensor, does not need the power cord power supply, and the installation of conveniently being under construction, secondly this sensor detectivity is high, and output signal's intensity and precision are higher than piezoelectric sensor, and inner structure is simple, and manufacturing cost is lower.

2. The application provides a pair of passive vibration sensor, it produces the signal of telecommunication through induction coil induced vibration and cutting magnetism induction line and detects the vibration, and the coil adopts the mode of hanging, increases its perception to small mechanical wave itself, and then improves the sensitivity of whole device.

3. The application provides a pair of passive vibration sensor has simple structure characteristics such as small, high-speed, high accelerated response are fast, can accomplish high accuracy high sensitivity's detection impact force vibration.

Drawings

FIG. 1 is an exploded view of the entire structure of the present embodiment;

FIG. 2 is an installation diagram of the overall structure of the present embodiment;

fig. 3 is a front sectional view of the entire structure of the present embodiment.

Description of reference numerals: 1. a housing; 11. an aperture; 2. a magnet; 3. an induction coil; 4. a base; 41. a screw hole; 5. a magnet skeleton; 6. a connector is provided.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses passive vibration sensor, it mainly comprises base 4, casing 1, a plurality of magnet 2 and induction coil 3, and base 4 is used for the fixed casing 1 of installation, and casing 1 and base 4 adopt the aluminum alloy to make. The base 4 is provided with a screw hole 41 which can fix the sensor on an object to be measured; the housing 1 is used to support and fix the sensor internal structure.

A magnet framework 5 is arranged on the base 4 along the direction towards the inner part of the shell 1 in an extending way, the magnet framework 5 is used for supporting a plurality of magnets 2, a certain gap is formed between the outer wall of the inner shell and the inner part of the shell 1 along the circumferential direction, and the gap is used for installing the magnets 2.

A plurality of magnet 2 are the embedding of annular array along 1 inner wall of casing in the clearance, magnet 2 of this application adopts the permanent magnet, and the preferred neodymium iron boron magnetism body that is can keep its magnetism for a long time in magnet skeleton 5 to at the inside stable closed magnetic field that forms of casing 1.

Under this stable closed magnetic field, at 1 top trompil 11 of casing, 11 department screwed connection connectors 6 of top trompil, connectors 6 are used for hanging solid induction coil 3, hang induction coil 3 in casing 1 by the top opening part, and place in the magnetic field, induction coil 3 sets up perpendicularly and with 5 coaxial settings of magnet skeleton along 1 length direction of casing, connector 6 adopts common BNC plug, induction coil 3 walks line and connects outside collection equipment through connector 6, induction coil 3 is through transmitting the bnC interface with the signal of telecommunication, read by collection equipment.

The application provides a vibration sensor, its theory of operation does, when the sensor is fixed in other objects (building, bridge or precision equipment) surfaces, the measured object in case produces vibration or little deformation, can transmit induction coil 3 through casing 1 on, according to the vibration direction difference, induction coil 3 can produce swing or concertina movement to cutting magnetic field's magnetism line of induction produces the signal of telecommunication, this signal can be read by other equipment such as collection equipment (computer) through the BNC interface, and make the analysis to vibration amplitude and frequency.

When the induction coil 3 moves in the magnetic field, a voltage proportional to the moving speed of the induction coil 3, the intensity of the magnetic field, and the length of the wire is generated in the induction coil 3. According to the proportion of the force and the current on the induction coil 3, when the vibration sensor is subjected to impact force to generate vibration, corresponding fluctuation is generated, so that the voltage connected to the induction coil 3 is changed and fed back to an external acquisition device, and the generated vibration is measured through the change of the voltage.

The utility model provides an induction coil 3 adopts metal spring coil, and is preferred, and available copper or aluminium wire winding form spring shape's induction coil 3, and it adopts and hangs the welding on the BNC interface board, does not do the contact with magnet 2 and magnet skeleton 5, and is unsettled in the magnetic field, is free vertical state when no external vibration, has improved its sensitivity to the vibration perception.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A passive vibration sensor, characterized by: the magnetic field generator comprises a shell, and a plurality of magnets and induction coils which are arranged in the shell, wherein the magnets are distributed along the inner wall of the shell in an annular array manner to form a closed magnetic field;

2. A passive vibration sensor according to claim 1, wherein: the magnet is a permanent magnet.

3. A passive vibration sensor according to claim 2, wherein: the magnet is a neodymium iron boron magnet.

4. A passive vibration sensor according to claim 1, wherein: the bottom of the shell is fixedly provided with a base, and the base is provided with a cylindrical magnet framework facing the inside of the shell;

5. A passive vibration sensor according to claim 4, wherein: the base is provided with a screw hole and is used for being installed and fixed on an object to be measured.

6. A passive vibration sensor according to claim 4, wherein: the shell and the base are both made of aluminum alloy.

7. A passive vibration sensor according to claim 4, wherein: the induction coil is a metal spring coil and is coaxially arranged with the magnet framework.

8. A passive vibration sensor according to claim 1, wherein: the connector is a BNC plug.