Fiber grating accelerometer

Abstract

The fiber bragg grating accelerometer comprises a main body, an installation assembly and a protection mechanism, the main body comprises a machine body and two groups of first-stage installation plates, the two groups of first-stage installation plates are fixedly connected to two sides of the machine body respectively, and two groups of first-stage through holes are symmetrically formed in plate surfaces of the two groups of first-stage installation plates; the mounting assembly comprises a frame body, a secondary mounting plate and a connecting piece, the protection mechanism comprises four groups of buffer pieces and a cover body, the four groups of buffer pieces are fixedly connected to the four corners of the top of the frame body respectively, and each buffer piece comprises a shell, a movable block, a connecting column and a sponge gasket. The machine body is prevented from being polluted by dust or dirt in the long-term use process, meanwhile, the machine body is prevented from being directly impacted by external force to be damaged, the protection mechanism buffers impact force through a sponge gasket, the influence of impact on the monitoring result of the machine body can be reduced, and the whole device is of an assembled type and convenient to disassemble, assemble and maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber sensing, in particular to a fiber grating accelerometer. Background Art

[0002] Fiber Bragg grating accelerometer is a device used to monitor the vibration frequency of an object. It is mainly used for monitoring bridge cable tension and vibration monitoring of various engineering structures such as bridges and roadbeds. It has the advantages of small size, high sensitivity and reliability, and can work for a long time in harsh environments.

[0003] When installing, the fiber Bragg grating accelerometer is usually fixed directly to the object by fasteners such as screws or bolts. There is a lack of protective measures around it. During long-term use, it is easy to be contaminated by dust and dirt, and may be impacted by the outside world. When the accelerometer is impacted by external forces, it is easy to have a significant impact on the monitoring results and may cause damage to the fiber Bragg grating accelerometer. Therefore, there is room for improvement. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above problems of the fiber Bragg grating accelerometer, the present utility model is proposed.

[0006] Therefore, the purpose of the utility model is to provide a fiber grating accelerometer, which is used to solve the problems that the existing fiber grating accelerometers are insufficient in protective measures after installation, are easily contaminated by dust and dirt during long-term use, and may be impacted by the outside world, resulting in monitoring results being affected or the accelerometer being damaged.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions: a fiber grating accelerometer, comprising:

[0008] The main body includes a machine body and two sets of primary mounting plates, wherein the two sets of primary mounting plates are respectively fixedly connected to two sides of the machine body, and the plate surfaces of the two sets of primary mounting plates are symmetrically provided with two sets of primary through holes;

[0009] The mounting assembly comprises a frame, a secondary mounting plate and a connecting piece, wherein the frame is arranged below the machine body, two groups of the secondary mounting plates are arranged and fixedly connected to the inner walls on both sides of the frame, the two groups of the secondary mounting plates are arranged opposite to the two groups of the primary mounting plates respectively, and the positions of the two groups of the secondary mounting plates opposite to the corresponding primary through holes are provided with secondary through holes, and the connecting piece is arranged in four groups in coordination with the four groups of the primary through holes and the four groups of the secondary through holes, and is used to connect the primary mounting plate and the secondary mounting plate in coordination with the primary through holes and the secondary through holes;

[0010] A protective mechanism, comprising four groups of buffers and a cover body, wherein the four groups of buffers are fixedly connected to the four corners of the top of the frame body, respectively, and comprises a shell, a movable block, a connecting column and a sponge gasket, wherein the shell body is fixedly connected to the frame body, the movable block is movably arranged in the shell body, the top of the shell body has a circular opening, the connecting column is fixedly connected to the top of the movable block and passes through the circular opening, the sponge gasket is sleeved between the inner wall of the shell body and the movable block, and the cover body is arranged outside the four groups of shell bodies and is detachably connected to the four groups of connecting columns;

[0011] Wherein, the circular opening size of the shell is larger than the size of the connecting column and smaller than the size of the movable block.

[0012] As a preferred solution of the fiber grating accelerometer described in the utility model, the connecting member includes a connecting bolt and a locking nut, and the connecting bolt passes through the primary through hole and the corresponding secondary through hole and is threadedly connected with the locking nut.

[0013] As a preferred solution of the fiber grating accelerometer described in the utility model, the tops of the four groups of connecting columns are all provided with screw holes and are equipped with fixing screws, the cover body is provided with openings at positions opposite to the four groups of screw holes, the four groups of fixing screws respectively pass through the four groups of openings and are screwed into the corresponding screw holes, and the cover body is detachably connected to the four groups of connecting columns through the four groups of fixing screws.

[0014] As a preferred solution of the fiber grating accelerometer described in the utility model, wherein: the cover body is made of plastic material, and a plurality of groups of reinforcing ribs are integrally formed on the surface of the cover body.

[0015] As a preferred solution of the fiber grating accelerometer described in the utility model, the corners of the cover body are all rounded.

[0016] As a preferred solution of the fiber grating accelerometer described in the utility model, wherein: the frame is made of aluminum alloy material, and the surfaces of the frame and the movable block are smooth.

[0017] The beneficial effects of the utility model are as follows: by arranging a protective mechanism, the cover body is used to shield and protect the machine body, thereby preventing the machine body from being contaminated by dust or dirt during long-term use, and also avoiding the machine body from being directly damaged by external impact. The protective mechanism also buffers the impact force of the impact by arranging a sponge gasket, which can reduce the impact of the impact on the monitoring results of the machine body. The device as a whole is assembled, which is convenient for disassembly and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0019] Figure 1 The utility model is a schematic diagram of the upper three-dimensional structure of a fiber grating accelerometer.

[0020] Figure 2 It is a schematic diagram of the bottom three-dimensional structure of a fiber grating accelerometer of the utility model.

[0021] Figure 3 The utility model is a schematic diagram of the disassembled structure of a fiber grating accelerometer.

[0022] Figure 4 The utility model is a partial cross-sectional structural schematic diagram of a fiber grating accelerometer.

[0023] Description of the drawings: 100, main body; 101, machine body; 102, primary mounting plate; 102a, primary through hole; 200, mounting assembly; 201, frame; 202, secondary mounting plate; 202a, secondary through hole; 203, connecting bolt; 204, locking nut; 300, protective mechanism; 301, shell; 302, movable block; 303, connecting column; 304, sponge gasket; 305, cover; 306, fixing screw. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0027] Secondly, the utility model is described in detail with reference to the schematic diagram. When describing the embodiments of the utility model, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the utility model. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0028] Reference Figure 1-Figure 4 , is an embodiment of the utility model, and provides a fiber Bragg grating accelerometer, which includes:

[0029] The main body 100 includes a body 101 and two sets of primary mounting plates 102. The two sets of primary mounting plates 102 are respectively fixedly connected to both sides of the body 101. The two sets of primary mounting plates 102 are symmetrically provided with two sets of primary through holes 102a.

[0030] The mounting assembly 200 includes a frame 201, a secondary mounting plate 202 and a connecting piece. The frame 201 is arranged below the machine body 101. Two groups of secondary mounting plates 202 are provided and fixedly connected to the inner walls on both sides of the frame 201. The two groups of secondary mounting plates 202 are respectively arranged opposite to the two groups of primary mounting plates 102. The positions of the two groups of secondary mounting plates 202 opposite to the corresponding primary through holes 102a are provided with secondary through holes 202a. The connecting piece is provided with four groups in coordination with the four groups of primary through holes 102a and the four groups of secondary through holes 202a, and is used to connect the primary mounting plate 102 and the secondary mounting plate 202 in coordination with the primary through holes 102a and the secondary through holes 202a. The connecting piece includes a connecting bolt 203 and a locking nut 204. The connecting bolt 203 passes through the primary through hole 102a and the corresponding secondary through hole 202a and is threadedly connected with the locking nut 204.

[0031] The protection mechanism 300 includes four groups of buffers and a cover 305. The four groups of buffers are fixedly connected to the four corners of the top of the frame 201, and include a shell 301, a movable block 302, a connecting column 303 and a sponge gasket 304. The shell 301 is fixedly connected to the frame 201, and the movable block 302 is movably arranged in the shell 301. The top of the shell 301 has a circular opening. The connecting column 303 is fixedly connected to the top of the movable block 302 and passes through the circular opening. The sponge gasket 304 is sleeved between the inner wall of the shell 301 and the movable block 302. The cover 305 is covered on the outside of the four groups of shells 301 and is detachably connected to the four groups of connecting columns 303.

[0032] The circular opening of the housing 301 has a size larger than that of the connecting column 303 and smaller than that of the movable block 302 , thereby preventing the movable block 302 from falling out and ensuring that the movable block 302 can move.

[0033] In addition, the tops of the four groups of connecting columns 303 are all provided with screw holes and are equipped with fixing screws 306. The cover body 305 is provided with openings at positions opposite to the four groups of screw holes. The four groups of fixing screws 306 pass through the four groups of openings and are screwed into the corresponding screw holes. The cover body 305 is detachably connected to the four groups of connecting columns 303 through the four groups of fixing screws 306.

[0034] It should be noted that the cover body 305 is made of plastic material, which is light, corrosion-resistant, low-cost and easy to process. The surface of the cover body 305 is also integrally formed with multiple sets of reinforcing ribs, which are used to ensure the strength of the cover body 305. The corners of the cover body 305 are all rounded, which improves the aesthetics while preventing sharp corners from hurting people. The frame 201 is made of aluminum alloy material, which is light, strong, corrosion-resistant and easy to process. The surface of the frame 201 and the movable block 302 is smooth, and the smooth surface can reduce friction.

[0035] Working principle: When installing the device, remove the four sets of fixing screws 306 by screwing them outwards. At this time, the cover body 305 can be removed. After removing the cover body 305, remove the four sets of sponge washers 304 by screwing them outwards. Four sets of mounting holes are prefabricated at the installation position, and the positions of the four sets of mounting holes are aligned with the positions of the four sets of secondary through holes 202a one by one. Insert the four sets of connecting bolts 203 into the four sets of mounting holes and then screw them in again and tighten the four sets of locking nuts 204. At this time, the frame 201 and the machine body 101 are fastened. Re-cover the cover body 305 and fix the cover body 305 and the four sets of connecting columns 303 by four sets of fixing screws 306. The device installation is completed.

[0036] When the device is hit, the cover 305 protects the body 101. At the same time, the impact causes the cover 305 to shift in position. The cover 305 drives the four groups of connecting columns 303 to move. The four groups of connecting columns 303 drive the four groups of movable blocks 302 to move. The four groups of sponge washers 304 are squeezed and deformed. The four groups of sponge washers 304 buffer the impact force and reduce the impact on the frame 201 and the body 101. After the impact, the sponge washers 304 are reset under the action of their own elastic force, driving the movable blocks 302, the connecting columns 303 and the cover 305 to reset.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A fiber Bragg grating accelerometer, characterized in that: include: The main body (100) comprises a machine body (101) and two groups of primary mounting plates (102), wherein the two groups of primary mounting plates (102) are respectively fixedly connected to two sides of the machine body (101), and the plate surfaces of the two groups of primary mounting plates (102) are symmetrically provided with two groups of primary through holes (102a); The mounting assembly (200) comprises a frame (201), a secondary mounting plate (202) and a connecting piece, wherein the frame (201) is arranged below the machine body (101), two groups of the secondary mounting plates (202) are arranged and fixedly connected to the inner walls on both sides of the frame (201), the two groups of the secondary mounting plates (202) are arranged opposite to the two groups of the primary mounting plates (102) respectively, and the two groups of the secondary mounting plates (202) are provided with secondary through holes (202a) at positions opposite to the corresponding primary through holes (102a), and the connecting piece is arranged in four groups in coordination with the four groups of the primary through holes (102a) and the four groups of the secondary through holes (202a), and is used to coordinate the primary through holes (102a) and the secondary through holes (202a) to connect the primary mounting plate (102) and the secondary mounting plate (202); A protective mechanism (300) comprises four groups of buffers and a cover (305), wherein the four groups of buffers are respectively fixedly connected to the four corners of the top of the frame (201), and comprises a shell (301), a movable block (302), a connecting column (303) and a sponge gasket (304), wherein the shell (301) is fixedly connected to the frame (201), the movable block (302) is movably arranged in the shell (301), the top of the shell (301) has a circular opening, the connecting column (303) is fixedly connected to the top of the movable block (302) and passes through the circular opening, the sponge gasket (304) is sleeved between the inner wall of the shell (301) and the movable block (302), and the cover (305) is arranged outside the four groups of shells (301) and is detachably connected to the four groups of connecting columns (303); The circular opening of the housing (301) has a size larger than that of the connecting column (303) and smaller than that of the movable block (302).

2. A fiber Bragg grating accelerometer according to claim 1, characterized in that: The connecting member comprises a connecting bolt (203) and a locking nut (204); the connecting bolt (203) passes through the primary through hole (102a) and the corresponding secondary through hole (202a) and is threadedly connected to the locking nut (204).

3. A fiber Bragg grating accelerometer according to claim 1, characterized in that: The tops of the four groups of connecting columns (303) are all provided with screw holes and are matched with fixing screws (306). The positions of the cover body (305) facing the four groups of screw holes are all provided with openings. The four groups of fixing screws (306) pass through the four groups of openings and are screwed into the corresponding screw holes respectively. The cover body (305) is detachably connected to the four groups of connecting columns (303) through the four groups of fixing screws (306).

4. A fiber Bragg grating accelerometer according to claim 1, characterized in that: The cover body (305) is made of plastic material, and a plurality of groups of reinforcing ribs are integrally formed on the surface of the cover body (305).

5. A fiber Bragg grating accelerometer according to claim 1 or 4, characterized in that: The corners of the cover body (305) are all rounded.

6. A fiber Bragg grating accelerometer according to claim 1, characterized in that: The frame (201) is made of aluminum alloy material, and the surfaces of the frame (201) and the movable block (302) are smooth.

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