CN113358207A

CN113358207A - Vibration sensor

Info

Publication number: CN113358207A
Application number: CN202110861072.5A
Authority: CN
Inventors: 星学奎
Original assignee: Weihai Guangda Exploration Instrument Co ltd
Current assignee: Weihai Guangda Exploration Instrument Co ltd
Priority date: 2020-07-31
Filing date: 2021-07-29
Publication date: 2021-09-07

Abstract

The invention relates to a vibration sensor, which solves the technical problem that the frequency parameter of the sensor is limited by a metal spring piece of the existing vibration sensor and comprises a shell, an upper cover, a lower cover, magnetic steel, an upper magnetic shoe, a lower magnetic shoe, an upper spring piece, a lower spring piece, a coil frame and a coil. The invention can be used in the fields of exploration, engineering geophysical prospecting, earthquake monitoring, equipment vibration detection, aviation, aerospace and the like.

Description

Vibration sensor

Technical Field

The invention relates to the technical field of magnetoelectric vibration sensors, in particular to a vibration sensor.

Background

The magnetoelectric vibration sensor is a passive and economic method with better effect for long-term use as a vibration detection or monitoring technology, and has wide application in the fields of exploration, engineering geophysical prospecting, earthquake monitoring, equipment vibration detection, aviation, aerospace and the like. Reference patent No. 2014200401093, the utility model patent of the name "geophone", current vibration sensor includes the shell, the upper cover, the lower cover, the coil former, the magnet steel, go up the magnetism boots, down the magnetism boots, go up the spring leaf, lower magnetism boots are connected with the inboard of lower cover, the magnet steel is connected with lower magnetism boots, it is connected with the magnet steel to go up the magnetism boots, the coil former is connected with the coil, the coil former cover is on the magnet steel, it is connected with last magnetism boots to go up the spring leaf, lower spring leaf is connected with lower magnetism boots, the upper end of coil former links to each other with the periphery of last spring leaf, the lower extreme of coil former links to each other with the periphery of lower spring leaf. The spring piece is made of metal, and the natural frequency is too high, so that the frequency of the vibration sensor is difficult to reach low frequency or ultralow frequency. In order to reduce the frequency of the sensor, it is common practice to increase the product diameter and increase the mass of the coil on the coil former, however, the detector is easily damaged due to the excessive mass and structural size, and the service life of the sensor is reduced.

Disclosure of Invention

The invention provides a vibration sensor for reducing frequency parameters, aiming at solving the technical problem that the frequency parameters of the sensor are limited by a metal spring piece of the existing vibration sensor.

The invention provides a vibration sensor which comprises a shell, an upper cover, a lower cover, magnetic steel, an upper magnetic shoe, a lower magnetic shoe, an upper spring piece, a lower spring piece, a coil frame and a coil.

Preferably, the upper spring plate is made of bakelite, PVC or phenolic resin; the lower spring leaf is made of bakelite, PVC or phenolic resin.

Preferably, the number of the upper spring pieces is one.

Preferably, the number of the upper spring pieces is more than two, after the more than two upper spring pieces are stacked together, the two upper spring pieces are pressed on the upper end of the coil rack by a pressing block, and a pressing screw penetrates through the pressing block and is connected with the upper end of the coil rack.

Preferably, the number of the lower spring pieces is one.

Preferably, the number of the lower spring pieces is more than two, after the more than two lower spring pieces are stacked together, the two lower spring pieces are pressed at the lower end of the coil rack by a pressing block, and a pressing screw penetrates through the pressing block and is connected with the lower end of the coil rack.

The invention has the beneficial effects that: under the condition that the size of a sensor product is not changed, the spring piece made of non-metal materials is used, the frequency of the vibration sensor can be reduced, and therefore the low-frequency and ultralow-frequency performance of the sensor is achieved. According to the invention, referring to FIGS. 10 and 11, through tests, the sensitivity of the product of the invention can reach 45000.000mv/m/s, while the sensitivity of the product of the prior art is only 28800.000mv/m/s, so that the sensitivity of the invention is higher. Compared with the prior art product in the range of 2 Hz-10 Hz, the product has the output rated value of approximately 70% at 2Hz, and the output rated value of 95% at 2.5Hz, while the prior art product can only reach 15% of the rated value and only reach 30% at 3 Hz.

Drawings

FIG. 1 is a schematic diagram of the construction of the vibration sensor of the present invention;

FIG. 2 is a cross-sectional view of the vibration sensor of the present invention;

FIG. 3 is a schematic view of the attachment of the hold down blocks to the spring plate;

FIG. 4 is prior art product sensitivity test data;

FIG. 5 is prior art product sensitivity test data;

FIG. 6 is prior art product sensitivity test data;

FIG. 7 is sensitivity test data for a product of the present invention;

FIG. 8 is sensitivity test data for a product of the present invention;

FIG. 9 is sensitivity test data for a product of the present invention;

FIG. 10 is a test curve plotted from the data of FIGS. 4, 5 and 6;

fig. 11 is a test curve plotted from the data of fig. 7, 8 and 9.

The symbols in the drawings illustrate that:

1. the magnetic steel coil comprises a shell, 2 parts of an upper cover, 3 parts of a lower cover, 4 parts of magnetic steel, 5 parts of an upper magnetic shoe, 6 parts of a lower magnetic shoe, 7 parts of an upper spring piece, 8 parts of a lower spring piece, 9 parts of a coil rack, 10 parts of a coil, 11 parts of a compression block and 12 parts of a compression screw.

Detailed Description

The present invention will be described in further detail below with reference to specific embodiments thereof with reference to the attached drawings.

As shown in fig. 1-2, the vibration sensor includes a housing 1, an upper cover 2, a lower cover 3, a magnetic steel 4, an upper magnetic shoe 5, a lower magnetic shoe 6, an upper spring plate 7, a lower spring plate 8, a coil frame 9, and a coil 10, where the upper cover 2 is connected to the housing 1, the lower cover 3 is connected to the housing 1, the lower magnetic shoe 6 is connected to the lower cover 3, the magnetic steel 4 is connected to the lower magnetic shoe 6, the upper magnetic shoe 5 is connected to the magnetic steel 4, the coil 10 is connected to the coil frame 9, the coil frame 10 is sleeved on the magnetic steel 4, the upper spring plate 7 is connected to the upper magnetic shoe 5, the lower spring plate 8 is connected to the lower magnetic shoe 6, an upper end of the coil frame 9 is connected to an outer periphery of the upper spring plate 7, and a lower end of the coil frame 9 is connected to an outer periphery of the lower spring plate 8.

The upper spring plate 7 is made of nonmetal materials such as bakelite, PVC or phenolic resin, and the lower spring plate 8 is made of nonmetal materials such as bakelite, PVC or phenolic resin. The upper spring plate 7 and the lower spring plate 8 made of non-metal materials can reduce the frequency of the vibration sensor, so that the low-frequency and ultralow-frequency performance of the sensor is realized.

The number of the upper spring pieces 7 can be one, or more than two spring pieces can be superposed together, and the specific number is set according to the frequency requirement. As shown in fig. 3, the specific implementation structure of the superposition of the two upper spring leaves may be: after the two upper spring leaves are stacked together, the two upper spring leaves are pressed on the upper end of the coil rack 9 by a pressing block 11, and then a pressing screw 12 passes through the pressing block 11 and is connected with the upper end of the coil rack 9. Three or more upper spring plates are mounted, also stacked together, and then secured with hold-down blocks and hold-down screws.

Similarly, the number of the lower spring pieces 8 is not limited to one, and more than two spring pieces can be stacked together. The two lower spring pieces can also be mounted by pressing the lower end of the coil rack 9 by a pressing block, and a pressing screw penetrates through the pressing block and is connected with the lower end of the coil rack 9. Three or more lower spring plates are mounted, also stacked together, and then fixed with a hold-down block and a hold-down screw.

The spring piece can select suitable size according to the rigidity requirement, if different rigidity is required, the spring piece thickness can be increased or reduced, or the spring piece shape can be changed and the like.

The coil frame 9 can be made of metal or non-metal material with larger density, and the proper size is selected according to the actual quality requirement.

Claims

1. The utility model provides a vibration sensor, includes shell, upper cover, lower cover, magnet steel, go up magnetic shoe, lower magnetic shoe, go up the spring leaf, lower spring leaf, coil former and coil, the upper cover is connected with the shell, the lower cover is connected with the shell, lower magnetic shoe is connected with the lower cover, the magnet steel is connected with lower magnetic shoe, it is connected with the magnet steel to go up magnetic shoe, the coil is connected with the coil former, the coil former cover is on the magnet steel, it is connected with last magnetic shoe to go up the spring leaf, lower spring leaf is connected with lower magnetic shoe, the upper end of coil former is connected with the periphery of last spring leaf, the lower extreme of coil former is connected with the periphery of spring leaf down, a serial communication port, the material of going up the spring leaf is non-metal material, the material of spring leaf is non-metal material down.

2. The vibration sensor according to claim 1, wherein the upper spring plate is made of bakelite, PVC, or phenolic resin; the lower spring leaf is made of bakelite, PVC or phenolic resin.

3. The vibration sensor according to claim 1 or 2, wherein the number of the upper spring pieces is one.

4. The vibration transducer according to claim 1 or 2, wherein the number of the upper spring pieces is two or more, and after the two or more upper spring pieces are stacked together, the two upper spring pieces are pressed against the upper end of the bobbin by a pressing block, and a pressing screw penetrates through the pressing block and is connected to the upper end of the bobbin.

5. The vibration sensor according to claim 1 or 2, wherein the number of the lower spring pieces is one.

6. The vibration sensor according to claim 1 or 2, wherein the number of the lower spring pieces is two or more, and after the two or more lower spring pieces are stacked together, the two lower spring pieces are pressed against the lower end of the bobbin by a pressing block, and a pressing screw penetrates through the pressing block and is connected to the lower end of the bobbin.