CN215415494U

CN215415494U - Piezoresistive acceleration sensor convenient to install

Info

Publication number: CN215415494U
Application number: CN202121285152.2U
Authority: CN
Inventors: 何仑
Original assignee: Yangzhou Kedong Electronics Co ltd
Current assignee: Yangzhou Kedong Electronics Co ltd
Priority date: 2021-06-09
Filing date: 2021-06-09
Publication date: 2022-01-04
Anticipated expiration: 2031-06-09

Abstract

The utility model relates to a piezoresistive acceleration sensor convenient to mount, which comprises a sensor body, wherein the sensor body comprises a frame body, a silicon block is arranged on the inner wall of one side of the frame body, a cantilever beam is arranged on the surface of the silicon block, a mass block is arranged at one end of the cantilever beam, a through groove is arranged on the surface of the mass block, a support rod is arranged in the through groove, two ends of the support rod are respectively connected with the upper inner wall and the lower inner wall of the frame body, the piezoresistive acceleration sensor is suitable for measuring low-frequency micro vibration of large buildings and bridges, and can effectively prevent the breakage of a cantilever beam and be convenient to install due to the structure design of the piezoresistive acceleration sensor, wherein the piezoresistive acceleration sensor is provided with the cantilever beam, the mass block, the through groove, the supporting rod, the limiting plate B, the limiting plate A, the mounting plate, the placing groove, the screw rod, the fixing plate and the like.

Description

Piezoresistive acceleration sensor convenient to install

Technical Field

The utility model relates to the field of piezoresistive acceleration, in particular to a piezoresistive acceleration sensor convenient to mount.

Background

The piezoresistive acceleration sensor is one of sensors, which can be divided into a system feedback device and a navigation device, wherein the former is used for controlling a system to be used as acceleration signal feedback, and the latter is used for detecting the acceleration of the navigation device.

However, the current piezoresistive acceleration sensor structure still has certain problems: firstly, the cantilever beam inside the acceleration sensor can bend downwards or upwards in use, if the vibration amplitude of a measured machine is too large, the cantilever beam is easy to break, the vibration direction of the machine is often random, the bending amplitude of the cantilever beam towards other directions except the measured direction is too large, the service life of the cantilever beam can be shortened, in addition, the sensor is usually installed by adopting glue for bonding, therefore, when a user takes off the sensor, the frame body of the sensor is often easily damaged, the sensor is damaged, and the defects and the shortcomings can be solved by designing a novel structure.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the defects in the prior art, and provides a piezoresistive acceleration sensor convenient to mount.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a piezoresistive acceleration sensor convenient to install comprises a sensor body, wherein the sensor body comprises a frame body, a silicon block is arranged on the inner wall of one side of the frame body, a cantilever beam is arranged on the surface of the silicon block, a mass block is installed at one end of the cantilever beam, a through groove is formed in the surface of the mass block, a supporting rod is arranged inside the through groove, two ends of the supporting rod are respectively connected with the inner walls of the upper side and the lower side of the frame body, limiting plates B are symmetrically arranged on the surface of the supporting rod from top to bottom, the horizontal height of the mass block is positioned between the two limiting plates B, the left side wall and the right side wall of the supporting rod are both connected with limiting plates A through connecting rods, the limiting plates A are positioned inside the through groove, an L-shaped block is connected to one side wall of the frame body, a mounting plate is connected to one side wall of the L-shaped block, the mounting plate is positioned on the lower side of the frame body, and an arc-shaped plate is connected to one side wall of the frame body opposite to the L-shaped block, the surface threaded connection of arc has the screw rod, the one end of screw rod is provided with the slurcam, the spout has been seted up to the bottom of framework, the inside sliding connection of spout has the slider, the bottom of slider is connected with the fixed plate, the surface of mounting panel has been seted up there is the standing groove, the inside of standing groove is provided with the bonding board.

Preferably, a damping block is arranged inside the placing groove and is positioned on the upper side of the bonding plate; the frame body can be driven to vibrate together by the vibration generated by the measured machine, and the damping block is arranged to play a role in buffering and damping in order to prevent the frame body from falling off or internal parts of the frame body from being damaged.

Preferably, the surface of the pushing plate is abutted against the surface of the fixing plate, and a rotating cap is connected to one side wall of the screw rod relative to the pushing plate; the user twists the rotating cap, lets the screw rod carry out horizontal removal to let the slurcam of screw rod one end promote the fixed plate and fix the one end of bonding board.

Preferably, piezoresistors are arranged on the upper surface and the lower surface of one side of the cantilever beam, which is far away from the mass block; the piezoresistor can acquire the stress generated by the bending of the cantilever beam, so that a corresponding acceleration value is obtained.

Preferably, the width of the limiting plate B is larger than that of the through groove, and the horizontal height of the bonding plate is lower than that of the mounting plate and the fixing plate; the width of limiting plate B is great, and when cantilever beam bending amplitude was too big like this, the quality piece can receive limiting plate B's the blockking to avoid the cantilever beam to break off, the bonding board height is lower, and the bonding board just can be with machine surface contact and absorption like this.

Preferably, the anti-skid pads are bonded on one side wall of the placing groove, which is relatively close to the fixed plate, and the two side walls of the bonding plate are respectively abutted against the surfaces of the two anti-skid pads; the non-slip mat can prevent that the bonding board from breaking away from the inside of mounting panel and fixed plate, and is fixed effectual.

Preferably, the use frequency of the sensor body is 0Hz-100Hz, and the measurement range of the sensor body is 0.01g-10 g; the sensor body is used in a limited dynamic range, and data of vibration measurement of a bridge or a large civil structure can be ensured not to be distorted.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, a piezoresistor acceleration sensor usually measures the stress generated by upward or downward bending of a cantilever beam to obtain a corresponding acceleration value, in order to prevent the cantilever beam from breaking due to overlarge bending amplitude, a support rod is arranged in a through groove of a mass block, when the cantilever beam bends up and down, the height of the mass block can be limited by two limiting plates B, and when the cantilever beam bends left and right, the mass block can be limited by two limiting plates A in the through groove in the horizontal direction, so that the cantilever beam can be prevented from breaking due to overlarge bending amplitude towards any direction, the acceleration sensor is more durable, when the vibration of large civil engineering structures such as bridges and the like is measured, the slow vibration of the buildings can be captured by the aid of a dynamic strain gauge, and the measurement data of the sensor body are more accurate.

2. When the sensor is fixed, one end of an adhesive plate is placed in the placing groove, the screw is rotated by rotating the cap, the pushing plate at one end of the screw pushes the fixing plate to move towards one side of the mounting plate until the surface of the fixing plate is abutted against one end of the adhesive plate, the adhesive plate is clamped at the bottom of the frame body firmly, then the adhesive plate and a measured machine are connected through glue, when a user wants to take down the sensor to measure other machines, the screw is directly loosened and the adhesive plate is replaced again, and therefore damage to the sensor frame body is avoided.

Drawings

FIG. 1 is a schematic structural diagram of a piezoresistive acceleration sensor convenient to mount according to the present invention;

FIG. 2 is a bottom view of a piezoresistive acceleration sensor that is easy to install according to the present invention;

FIG. 3 is a schematic diagram of a partial structure of a piezoresistive acceleration sensor convenient to mount according to the present invention;

fig. 4 is a schematic diagram of a second embodiment of a piezoresistive acceleration sensor convenient to mount according to the present invention.

In the figure: 1. a frame; 2. silicon blocks; 3. a voltage dependent resistor; 4. a cantilever beam; 5. a mass block; 6, an L-shaped plate; 7. mounting a plate; 8. a limiting plate A; 9. a limiting plate B; 10. a support bar; 11. a through groove; 12, rotating the cap; 13. a fixing plate; 14. a non-slip mat; 15. a slider; 16. a placement groove; 17. bonding the board; 18. a push plate; 19. a screw; 20. a damping block; 21. an arc-shaped plate; 22. a chute; 23. a sensor body.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

The first embodiment is as follows:

a piezoresistive acceleration sensor convenient to install comprises a sensor body 23, the sensor body 23 comprises a frame body 1, a silicon block 2 is arranged on the inner wall of one side of the frame body 1, a cantilever beam 4 is arranged on the surface of the silicon block 2, a mass block 5 is installed at one end of the cantilever beam 4, a through groove 11 is formed in the surface of the mass block 5, a support rod 10 is arranged inside the through groove 11, two ends of the support rod 10 are respectively connected with the inner walls of the upper side and the lower side of the frame body 1, limiting plates B9 are symmetrically arranged on the surface of the support rod 10 in an up-down mode, the horizontal height of the mass block 5 is located between the two limiting plates B9, the left side wall and the right side wall of the support rod 10 are connected with a limiting plate A8 through connecting rods, a limiting plate A8 is located inside the through groove 11, piezoresistors 3 are respectively arranged on the upper surface and the lower surface of one side, far away from the mass block 5, of the cantilever beam 4, the service frequency of the sensor body 23 is 0Hz-100Hz, the measurement range of the sensor body 23 is 0.01-10 g, see figures 1 and 2; the piezoresistor 3 can acquire the stress generated by the bending of the cantilever beam 4 so as to obtain a corresponding acceleration value, and the sensor body 23 is used in a limited dynamic range, so that the data of vibration measurement of bridges or large civil buildings can be ensured not to be distorted.

An L-shaped block 6 is connected to one side wall of a frame body 1, a mounting plate 7 is connected to one side wall of the L-shaped block 6, the mounting plate 7 is located on the lower side of the frame body 1, an arc plate 21 is connected to one side wall of the frame body opposite to the L-shaped block 6, a screw rod 19 is connected to the surface of the arc plate 21 in a threaded manner, a pushing plate 18 is arranged at one end of the screw rod 19, a sliding groove 22 is formed in the bottom of the frame body 1, a sliding block 15 is connected to the inside of the sliding groove 22 in a sliding manner, a fixing plate 13 is connected to the bottom of the sliding block 15, a placing groove 16 is formed in the surface of the mounting plate 7, an adhesive plate 17 is arranged inside the placing groove 16, the surface of the pushing plate 18 is abutted to the surface of the fixing plate 13, a rotating cap 12 is connected to one side wall of the screw rod 19 opposite to the pushing plate 18, the width of a limiting plate B9 is larger than that of the through groove 11, the horizontal height of the adhesive plate 17 is lower than that of the mounting plate 7 and the fixing plate 13, and anti-slip pads 14 are adhered to one side wall of the placing groove 16 and the fixing plate 13, two side walls of the adhesive plate 17 are respectively abutted against the surfaces of the two anti-skid mats 14, as shown in the attached figures 1, 2 and 3; the user is twisted and is moved rotation cap 12, let screw rod 19 carry out horizontal removal, thereby let the slurcam 18 of screw rod 19 one end promote fixed plate 13 and fix the one end of bonding board 17, limiting plate B9's width is great, like this when cantilever beam 4 bending amplitude is too big, quality piece 5 can receive the blockking of limiting plate B9, thereby avoid cantilever beam 4 to break off, bonding board 17 height is lower, bonding board 17 just can with machine surface contact and adsorb like this, slipmat 14 can prevent that bonding board 17 from breaking away from the inside of mounting panel 7 and fixed plate 13, it is fixed effectual.

Example two:

a damping block 20 is arranged in the placing groove 16, and the damping block 20 is positioned on the upper side of the bonding plate 17, as shown in figure 4; the frame 1 is driven to vibrate by the vibration generated by the measuring machine, and the damping block 20 is arranged to play a role in buffering and absorbing shock in order to prevent the frame 1 from falling off or internal components from being damaged.

The working principle is as follows: the piezoresistive acceleration sensor usually measures the stress generated by the upward or downward bending of the cantilever beam 4 through the piezoresistor 3 to obtain a corresponding acceleration value, in order to prevent the breakage of the cantilever beam 4 due to the overlarge bending amplitude, the support rod 10 is arranged inside the through groove 11 of the mass block 5, when the cantilever beam 4 bends up and down, the two limit plates B9 can limit the height of the mass block 5, and when the cantilever beam 4 bends left and right, the two limit plates A8 in the through groove 11 can limit the mass block 5 in the horizontal direction, so as to ensure that the cantilever beam 4 cannot break due to the overlarge bending amplitude in any direction, so that the acceleration sensor is more durable, when the vibration of large civil engineering structures such as bridges is measured, the slow vibration of buildings can be captured by dynamically equipping a strain gauge, and the measurement data of the sensor body 23 are more accurate, when fixing the sensor, at first place the inside of standing groove 16 with the one end of a bonding board 17, later through rotating cap 12 and rotating screw rod 19, let the catch plate 18 of screw rod 19 one end promote fixed plate 13 and move to the direction of mounting panel 7 one side, until the surface of fixed plate 13 and the one end butt of bonding board 17, firmly clamp the bonding board 17 in the bottom of framework 1, then through glue with bonding board 17 and measurand machine connect can, when the user wants to take off the sensor and measure other machines, directly loosen screw rod 19 and change a bonding board 17 again can, thereby avoided the destruction to sensor framework 1.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. The utility model provides a pressure drag acceleration sensor convenient to installation, includes sensor body (23), its characterized in that, sensor body (23) include framework (1), one side inner wall of framework (1) is provided with silicon block (2), the surface of silicon block (2) is provided with cantilever beam (4), quality piece (5) are installed to the one end of cantilever beam (4), logical groove (11) have been seted up on the surface of quality piece (5), the inside that leads to groove (11) is provided with bracing piece (10), the both ends of bracing piece (10) respectively with the upper and lower both sides inner wall connection of framework (1), the symmetry is provided with limiting plate B (9) about the surface of bracing piece (10), the level of quality piece (5) is located between two limiting plate B (9), the left and right sides wall of bracing piece (10) all is connected with limiting plate A (8) through the connecting rod, the limiting plate A (8) is positioned in the through groove (11), one side wall of the frame body (1) is connected with an L-shaped block (6), a mounting plate (7) is connected with one side wall of the L-shaped block (6), the mounting plate (7) is positioned at the lower side of the frame body (1), an arc-shaped plate (21) is connected to one side wall of the frame body (1) corresponding to the L-shaped block (6), the surface of the arc-shaped plate (21) is in threaded connection with a screw rod (19), one end of the screw rod (19) is provided with a pushing plate (18), a sliding groove (22) is arranged at the bottom of the frame body (1), a sliding block (15) is connected inside the sliding groove (22) in a sliding manner, the bottom of the sliding block (15) is connected with a fixing plate (13), a placing groove (16) is formed in the surface of the mounting plate (7), and an adhesive plate (17) is arranged inside the placing groove (16).

2. Piezoresistive acceleration sensor for easy mounting according to claim 1, characterized in, that inside the placement groove (16) is provided a damping block (20), which damping block (20) is located on the upper side of the adhesive plate (17).

3. Piezoresistive acceleration sensor convenient to mount according to claim 1, characterized in that the surface of the push plate (18) abuts the surface of the fixed plate (13), and the screw (19) has a rotating cap (12) attached to one side wall of the push plate (18).

4. Piezoresistive acceleration sensor convenient to mount according to claim 1, characterized in that the piezoresistors (3) are mounted on both the upper and lower surfaces of the cantilever beam (4) on the side away from the mass (5).

5. Piezoresistive acceleration sensor easy to mount according to claim 1, characterized in that the width of the limiting plate B (9) is larger than the through slot (11), and the level of the adhesive plate (17) is lower than the mounting plate (7) and the fixing plate (13).

6. Piezoresistive acceleration sensor convenient to mount according to claim 1, characterized in that the side wall of the placement groove (16) and the fixed plate (13) are adhered with anti-skid pads (14), and the two side walls of the adhered plate (17) are respectively abutted with the surfaces of the two anti-skid pads (14).

7. Piezoresistive acceleration sensor according to claim 1, characterized in, that the sensor body (23) has a frequency of use between 0Hz and 100Hz, the sensor body (23) has a measuring range between 0.01g and 10 g.