Fiber grating cable force sensor packaging structure

Abstract

The utility model provides a fiber bragg grating cable force sensor packaging structure, which relates to the fiber bragg grating sensing field, and comprises a sensor body, a clamp and a cable steel wire, the sensor body comprises two groups of terminals, a pedestal, an elastic member and a protection tube, the terminals are symmetrically arranged, the inner sides of the two groups of terminals are provided with connecting seats, and the cable steel wire is connected with the pedestal. A matched connector is arranged at one end, close to the connecting seat, of the base, and the connector is in threaded connection with the connecting seat; according to the utility model, through the terminal, the base, the elastic member and the protection tube, the base is used for fixing the fiber bragg grating, and the elastic member is fixedly connected with the base, so that the fiber bragg grating is telescopically protected to a certain extent, the fiber bragg grating area is prevented from being excessively stretched, and the threaded connection between the base and the terminal is matched with the arrangement of the protection tube. The fiber bragg grating is integrally covered by the cover plate, so that the fiber bragg grating is protected to a certain extent, the fiber bragg grating is prevented from being bent and broken, and the use and the installation are more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber Bragg grating sensing, in particular to a packaging structure of an optical fiber Bragg grating cable force sensor. Background Art

[0002] Currently, although there are various technologies for measuring cable tension, including the resistance strain gauge method, the vibration frequency method, and the magnetic flux method, each of these methods has its own limitations. For example, the resistance strain gauge method is limited by environmental conditions, the signal is unstable, and the sensor is easily damaged; the vibration frequency method has limited application conditions and is affected by the installation location; the magnetic flux method requires complex equipment and high precision, and is easily affected by environmental factors such as temperature;

[0003] The main advantages of fiber grating sensors are small size, light weight, resistance to electromagnetic interference, electrical insulation, geometric shape plasticity, high sensitivity, high resolution, low loss and large transmission capacity; therefore, fiber grating tension sensors show significant advantages and application prospects in cable tension monitoring; since fiber grating itself is relatively fragile and prone to bending and breaking, it needs to be completely packaged and protected, so the utility model proposes a fiber grating tension sensor packaging structure to solve the problems existing in the existing technology. Utility Model Content

[0004] In response to the above problems, the present invention proposes a fiber grating cable force sensor packaging structure, which is composed of a terminal, a base, an elastic member and a protective tube, wherein the base and the terminal are threadedly connected, making the overall installation more convenient.

[0005] To achieve the purpose of the utility model, the utility model is implemented through the following technical solutions: a fiber optic Bragg grating tension sensor packaging structure, including a sensor body, a clamp and a cable wire, the sensor body including terminals, a base, an elastic member and a protective tube, the terminals are symmetrically arranged in two groups, the inner sides of the two groups of terminals are provided with connecting seats, the base is close to the end of the connecting seat and is provided with a matching connecting head, the connecting head is threadedly connected to the connecting seat, an elastic member is installed in the middle of the two groups of bases, the protective tube is located between the two groups of terminals, the protective tube is sleeved on the outside of the elastic member, and the outsides of the two groups of terminals are also provided with threaded heads.

[0006] A further improvement is that the base includes a fixing block and a mounting groove, one end of the fixing block is fixedly connected to the connector, and the other end of the fixing block is provided with a mounting groove fixed with a fiber optic Bragg grating, and the cross-section of the mounting groove is semicircular.

[0007] A further improvement is that the elastic member includes a mounting ring and a telescopic spring, the mounting rings are symmetrically provided in two groups, and a telescopic spring is fixed between the two groups of mounting rings.

[0008] A further improvement is that the protective tube includes a movable sleeve and a protective sleeve, the movable sleeve is located at both ends of the protective sleeve and is slidably connected to the protective sleeve, and the outer end of the movable sleeve is threadedly connected to the outer wall of the connecting seat.

[0009] A further improvement is that an extension tube is provided on the inner side of the movable sleeve, one end of the extension tube is inserted into the protective sleeve, a limiting ring is provided on the end of the extension tube, a limiting groove is provided on the inner side wall of the protective sleeve, and the limiting ring is slidably connected to the limiting groove.

[0010] The beneficial effects of the present invention are as follows: the present invention is composed of a terminal, a base, an elastic member and a protective tube, wherein the base is used to fix the optical fiber Bragg grating, and the elastic member is fixedly connected to the base, thereby providing a certain degree of expansion and contraction protection for the optical fiber Bragg grating, avoiding excessive stretching of the optical fiber Bragg grating area, and at the same time, the base and the terminal are threadedly connected, and the optical fiber Bragg grating is covered as a whole by the setting of the protective tube, thereby providing a certain degree of protection for the optical fiber Bragg grating, avoiding bending and breaking of the optical fiber Bragg grating, making it more convenient to use and install, and improving the service life of the optical fiber Bragg grating, and by arranging a mounting groove with a semicircular cross-section on the base, the two ends of the optical fiber Bragg grating are fixed to the mounting groove by bonding, and the semicircular cross-sectional structure facilitates the installation and fixation of the optical fiber Bragg grating. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a working assembly diagram of the utility model.

[0012] Figure 2 It is a disassembly schematic diagram of the utility model.

[0013] Figure 3 It is a structural schematic diagram of the base and the elastic member of the utility model.

[0014] Figure 4 It is a cross-sectional schematic diagram of the protection tube of the utility model.

[0015] Among them: 1. Sensor body; 2. Clamp; 3. Cable wire; 4. Terminal; 5. Base; 6. Elastic part; 7. Protective tube; 8. Connecting seat; 9. Connecting head; 10. Threaded head; 11. Fixing block; 12. Mounting groove; 13. Mounting ring; 14. Telescopic spring; 15. Moving sleeve; 16. Protective sleeve; 17. Extension tube; 18. Limiting ring; 19. Limiting groove. DETAILED DESCRIPTION

[0016] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0017] according to Figure 1-Figure 4 As shown, this embodiment proposes a fiber grating tension sensor packaging structure, including a sensor body 1, a clamp 2 and a cable wire 3, the sensor body 1 includes a terminal 4, a base 5, an elastic member 6 and a protective tube 7, the terminals 4 are symmetrically provided in two groups, the inner sides of the two groups of terminals 4 are provided with a connecting seat 8, the base 5 is close to the end of the connecting seat 8 and is provided with a matching connector 9, the connector 9 is threadedly connected to the connecting seat 8, an elastic member 6 is installed in the middle of the two groups of bases 5, the protective tube 7 is located between the two groups of terminals 4, the protective tube 7 is sleeved on the outside of the elastic member 6, and the outside of the two groups of terminals 4 is also provided with a threaded head 10.

[0018] This packaging structure consists of a terminal 4, a base 5, an elastic member 6 and a protective tube 7, wherein the base 5 is used to fix the optical fiber Bragg grating, and the elastic member 6 is fixedly connected to the base 5, thereby providing a certain degree of expansion and contraction protection for the optical fiber Bragg grating to avoid excessive stretching of the optical fiber Bragg grating area. At the same time, the base 5 and the terminal 4 are threadedly connected, and the protective tube 7 is used to cover the entire optical fiber Bragg grating, thereby providing a certain degree of protection for the optical fiber Bragg grating to avoid bending and breaking of the optical fiber Bragg grating, making it more convenient to use and install, and improving the service life of the optical fiber Bragg grating.

[0019] The base 5 includes a fixing block 11 and a mounting groove 12. One end of the fixing block 11 is fixedly connected to the connector 9. The other end of the fixing block 11 is provided with a mounting groove 12 for fixing the fiber grating. The cross section of the mounting groove 12 is semicircular.

[0020] The elastic member 6 includes a mounting ring 13 and a telescopic spring 14 . The mounting ring 13 is symmetrically provided in two groups, and a telescopic spring 14 is fixed between the two groups of mounting rings 13 .

[0021] By setting a mounting groove 12 with a semicircular cross-section on the base 5, the two ends of the fiber grating are fixed to the mounting groove 12 by bonding, and the semicircular cross-sectional structure facilitates the installation and fixation of the fiber grating. At the same time, the elastic member 6 is composed of a mounting ring 13 and a telescopic spring 14. During installation, the mounting ring 13 is connected to the fixing block 11 by dispensing glue, which is more convenient when installing the base 5 and the elastic member 6, and greatly reduces the assembly time.

[0022] The protection tube 7 includes a movable sleeve 15 and a protection sleeve 16 . The movable sleeve 15 is located at both ends of the protection sleeve 16 and is slidably connected to the protection sleeve 16 . The outer end of the movable sleeve 15 is threadedly connected to the outer wall of the connecting seat 8 .

[0023] An extension tube 17 is provided on the inner side of the movable sleeve 15, one end of the extension tube 17 is inserted into the protective sleeve 16, a limiting ring 18 is provided on the end of the extension tube 17, and a limiting groove 19 is provided on the inner side wall of the protective sleeve 16, and the limiting ring 18 is slidably connected to the limiting groove 19.

[0024] By setting the protective tube 7 into a structure in which a movable sleeve 15 and a protective sleeve 16 are spliced ​​together, wherein one end of the movable sleeve 15 is threadedly connected to the connecting seat 8 on the side of the terminal 4, a fixed module is formed between the base 5, the terminal 4 and the movable sleeve 15. When the optical fiber Bragg grating is subjected to tension, the telescopic spring 14 extends and the movable sleeve 15 extends synchronously, thereby achieving full protection of the optical fiber Bragg grating. When the movable sleeve 15 moves outward, the limit ring 18 moves in the limit groove 19, and the limit groove 19 also limits the maximum moving distance of the limit ring 18.

[0025] The fiber grating tension sensor packaging structure is achieved by first threading the connector 9 on the base 5 with the connecting seat 8 on a group of terminals 4, then fixing one end of the fiber grating on the mounting groove 12 on the base 5, and then installing the elastic member 6. The fixing block 11 of the base 5 and the mounting ring 13 are installed and connected by gluing. After the base 5 and the elastic member 6 are installed, the protective tube 7 is installed, and one end of the protective tube 7 is fixed by tightening the threads between the movable sleeve 15 and the connecting seat 8, and finally performing threaded installation between another group of terminals 4 and the base 5 and the movable sleeve 15.

[0026] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A fiber Bragg grating cable force sensor packaging structure, comprising a sensor body (1), a fixture (2) and a cable wire (3), characterized in that: The sensor body (1) comprises a terminal (4), a base (5), an elastic member (6) and a protective tube (7), wherein the terminal (4) is symmetrically provided in two groups, a connecting seat (8) is provided on the inner side of the two groups of the terminal (4), an end of the base (5) close to the connecting seat (8) is provided with a matching connecting head (9), the connecting head (9) is threadedly connected to the connecting seat (8), an elastic member (6) is installed between the two groups of the base (5), the protective tube (7) is located between the two groups of the terminal (4), the protective tube (7) is sleeved on the outer side of the elastic member (6), and a threaded head (10) is also provided on the outer side of the two groups of the terminal (4).

2. The fiber Bragg grating cable force sensor packaging structure according to claim 1, characterized in that: The base (5) comprises a fixing block (11) and a mounting groove (12), one end of the fixing block (11) is fixedly connected to the connector (9), and the other end of the fixing block (11) is provided with a mounting groove (12) fixed with a fiber optic Bragg grating, and the cross-section of the mounting groove (12) is semicircular.

3. The fiber Bragg grating cable force sensor packaging structure according to claim 2, characterized in that: The elastic member (6) comprises a mounting ring (13) and a telescopic spring (14). The mounting ring (13) is symmetrically provided with two groups, and a telescopic spring (14) is fixed between the two groups of mounting rings (13).

4. The fiber Bragg grating cable force sensor packaging structure according to claim 1, characterized in that: The protective tube (7) comprises a movable sleeve (15) and a protective sleeve (16), wherein the movable sleeve (15) is located at both ends of the protective sleeve (16) and is slidably connected to the protective sleeve (16), and the outer end of the movable sleeve (15) is threadedly connected to the outer wall of the connecting seat (8).

5. The fiber Bragg grating cable force sensor packaging structure according to claim 4, characterized in that: An extension tube (17) is provided on the inner side of the movable sleeve (15), one end of the extension tube (17) is inserted into the protective sleeve (16), a limiting ring (18) is provided on the end of the extension tube (17), a limiting groove (19) is provided on the inner side wall of the protective sleeve (16), and the limiting ring (18) is slidably connected to the limiting groove (19).

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