Small-size fiber bragg grating pressure ring

Abstract

The utility model provides a small-size fiber bragg grating pressure ring, which comprises a pressure ring stress main body, an inner hole formed by penetrating through the middle part of the pressure ring stress main body, a plurality of fiber bragg grating strain gauges arranged on the outer wall of the pressure ring stress main body along the circumferential direction of the pressure ring stress main body, and a fiber bragg grating thermometer arranged on the outer wall of the pressure ring stress main body, the protection mechanism is arranged on the outer side of the pressure ring stress main body; wherein the stress main body of the pressure ring is of a cylindrical structure. According to the utility model, the stress main body of the pressure ring adopts the hollow cylindrical structure, and can be realized by adopting a standard pipe, so that the machining cost of the traditional I-shaped structure is reduced, and meanwhile, the requirements of the upper and lower protruding parts of the traditional I-shaped structure on the welding space of the fiber bragg grating strain gauge can be reduced; the height of the fiber bragg grating pressure ring is reduced and is lower than 50mm, so that the adaptability of the fiber bragg grating pressure ring under different working conditions is improved.

Description

Technical Field

[0001] The utility model relates to the field of detection technology, in particular to a small-volume optical fiber grating pressure ring. Background Art

[0002] In civil engineering, cables and hangers are common and important load-bearing components. How to accurately and timely respond to the working status of these load-bearing components in a long-term manner is of great significance to production safety in real life. Traditional pressure rings include hydraulic, electromagnetic, vibrating string, etc., which all have problems such as short life, low precision, poor stability, or inability to monitor the stress conditions in real time. Fiber Bragg grating sensors have the characteristics of small size, light weight, high precision, long life, good stability, etc., and also have the function of real-time online monitoring. In recent years, they have been widely used in civil engineering structures such as bridges and tunnels.

[0003] However, the force-bearing body of the traditional fiber Bragg grating pressure ring adopts an "I"-shaped structure, which takes into account the space during production and makes the height more than 80 mm. As a result, the traditional pressure ring is difficult to use in scenarios where the installation space is limited. At the same time, the machining cost of the traditional structure is high and the working hours are long. In addition, the upper and lower protruding parts of the force-bearing body of the traditional "I"-shaped fiber Bragg grating pressure ring interfere with the welding space of the fiber Bragg grating strain gauge, which leads to the problem that the main body height is too high, which has a great impact on the volume and material weight. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide a small-volume fiber grating pressure ring that is compact and can adapt to a variety of working conditions.

[0005] The utility model provides the following technical solutions: a small-volume fiber Bragg grating pressure ring, comprising a pressure ring force-bearing body, an inner hole formed through the middle of the pressure ring force-bearing body, a plurality of fiber Bragg grating strain gauges arranged along the circumference of the outer wall of the pressure ring force-bearing body, a fiber Bragg grating thermometer arranged on the outer wall of the pressure ring force-bearing body, and a protective mechanism arranged outside the pressure ring force-bearing body;

[0006] The pressure ring force-bearing body is a cylindrical structure, the fiber Bragg grating strain gauge and the fiber Bragg grating thermometer are connected, and the protection mechanism is used to protect the pressure ring force-bearing body, the fiber Bragg grating strain gauge and the fiber Bragg grating thermometer.

[0007] Furthermore, 3 to 6 fiber grating strain gauges are arranged on the outer wall of the pressure ring force-bearing body along its circumference.

[0008] Furthermore, the fiber Bragg grating strain gauge and the fiber Bragg grating thermometer are connected via an optical cable.

[0009] Furthermore, the protective mechanism includes a protective ring sleeved on the outside of the pressure ring force-bearing body, and an upper protective cover and a lower protective cover respectively arranged on the upper and lower sides of the protective ring. An inner cavity is formed between the protective ring, the upper protective cover and the lower protective cover, and the pressure ring force-bearing body is located in the inner cavity.

[0010] Furthermore, the upper protective cover and the lower protective cover are welded to the upper and lower sides of the protective ring respectively.

[0011] Furthermore, the height of the small-volume fiber grating pressure ring is less than 50 mm.

[0012] Furthermore, the fiber grating strain gauges are evenly spaced and arranged along the circumferential direction of the outer wall of the pressure ring force-bearing body.

[0013] The beneficial effects of the utility model are as follows: the force-bearing body of the pressure ring adopts a cylindrical structure with a hollow center, which can be realized by using standard pipes, thereby reducing the machining cost of the traditional "I"-shaped structure, and at the same time reducing the welding space requirements for the fiber grating strain gauge at the upper and lower protruding parts of the traditional "I"-shaped structure, so that the height of the fiber grating pressure ring of the utility model is reduced to less than 50 mm, thereby improving the adaptability of the fiber grating pressure ring of the utility model under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0015] Figure 2 It is a schematic diagram of the explosion three-dimensional structure of the utility model.

[0016] The markings in the attached drawings are: 1-optical cable, 2-pressure ring force-bearing body, 3-inner hole, 4-fiber Bragg grating strain gauge, 5-fiber Bragg grating thermometer, 6-upper protective cover, 7-protection ring, 8-lower protective cover. DETAILED DESCRIPTION

[0017] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0018] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0020] A small-volume fiber Bragg grating pressure ring, such as Figure 1-Figure 2 As shown, it includes a pressure ring force-bearing body 2, an inner hole 3 formed through the middle of the pressure ring force-bearing body 2, a plurality of fiber Bragg grating strain gauges 4 arranged on the outer wall of the pressure ring force-bearing body 2 along its circumference, a fiber Bragg grating thermometer 5 arranged on the outer wall of the pressure ring force-bearing body 2, and a protective mechanism arranged on the outer side of the pressure ring force-bearing body 2;

[0021] Specifically, a small-volume fiber Bragg grating pressure ring has a height of less than 50 mm, a pressure ring stress-bearing body 2 is in a cylindrical structure, an inner hole 3 is formed through the middle of the pressure ring stress-bearing body 2, and the inner hole 3 is in a cylindrical shape, so that the pressure ring stress-bearing body 2 is in a cylindrical structure with a hollow center, and the cable is installed through the inner hole 3, a plurality of fiber Bragg grating strain gauges 4 are arranged on the outer wall of the pressure ring stress-bearing body 2 along its circumference, and the fiber Bragg grating strain gauges 4 are evenly spaced along the circumference of the outer wall of the pressure ring stress-bearing body 2, and 3 to 6 fiber Bragg grating strain gauges 4 are arranged, a fiber Bragg grating thermometer 5 is arranged on the outer wall of the pressure ring stress-bearing body 2, and the fiber Bragg grating thermometer 5 is used for temperature compensation, and the fiber Bragg grating thermometer 5 and the fiber Bragg grating strain gauge 4 are connected to the pressure ring stress-bearing body 2 by welding, and the fiber Bragg grating strain gauge 4 and the fiber Bragg grating thermometer 5 are connected by an optical cable 1, and a protective mechanism is arranged on the outside of the pressure ring stress-bearing body 2, and the protective mechanism is used to protect the pressure ring stress-bearing body 2, the fiber Bragg grating strain gauge 4 and the fiber Bragg grating thermometer 5.

[0022] In summary, the pressure ring force-bearing body 2 adopts a cylindrical structure with a hollow middle, which can be realized with standard pipes, reducing the machining cost of the traditional "I"-shaped structure. At the same time, it can reduce the welding space requirements for the fiber grating strain gauge 4 at the upper and lower protruding parts of the traditional "I"-shaped structure, so that the height of the fiber grating pressure ring of the utility model is reduced to less than 50 mm, thereby improving the adaptability of the fiber grating pressure ring of the utility model under different working conditions.

[0023] The protection mechanism includes a protection ring 7 sleeved on the outside of the pressure ring force-bearing body 2, and an upper protection cover 6 and a lower protection cover 8 respectively arranged on the upper and lower sides of the protection ring 7. An inner cavity is formed between the protection ring 7, the upper protection cover 6 and the lower protection cover 8, and the pressure ring force-bearing body 2 is located in the inner cavity.

[0024] It can be understood that the protection ring 7 is a hollow cylindrical structure, and its height is consistent with the height of the pressure ring force-bearing body 2. The inner diameter of the protection ring 7 is larger than the diameter of the pressure ring force-bearing body 2. When installing the protection ring 7, it can be directly put on the outer side of the pressure ring force-bearing body 2. The upper protective cover 6 and the lower protective cover 8 are of the same shape, both of which are circular ring structures, and the inner diameters of the upper protective cover 6 and the lower protective cover 8 are smaller than the diameter of the pressure ring force-bearing body 2. The inner diameters of the upper protective cover 6 and the lower protective cover 8 are greater than or equal to the diameter of the inner hole 3. The upper protective cover 6 and the lower protective cover 8 are welded to the upper and lower sides of the protection ring 7 respectively, thereby forming an inner cavity through the protection ring 7, the upper protective cover 6 and the lower protective cover 8, and the pressure ring force-bearing body 2, the fiber grating strain gauge 4 and the fiber grating thermometer 5 are all located in the inner cavity, thereby protecting the pressure ring force-bearing body 2, the fiber grating strain gauge 4 and the fiber grating thermometer 5.

[0025] When the protective mechanism is specifically assembled: first, put the protective ring 7 on the outside of the pressure ring force-bearing body 2, then take out the upper protective cover 6 and the lower protective cover 8, and then weld the upper protective cover 6 to the upper side of the protective ring 7. During the welding process, the upper protective cover 6 must be fully aligned and fit with the protective ring 7 to prevent a gap from being generated between the protective ring 7 and the upper protective cover 6. After welding is completed, then weld the lower protective cover 8 to the lower side of the protective ring 7. The specific welding process is the same as that of the upper protective cover 6.

[0026] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0027] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A small-volume fiber Bragg grating pressure ring, characterized in that: It includes a pressure ring force-bearing body, an inner hole formed through the middle of the pressure ring force-bearing body, a plurality of fiber Bragg grating strain gauges arranged on the outer wall of the pressure ring force-bearing body along its circumference, a fiber Bragg grating thermometer arranged on the outer wall of the pressure ring force-bearing body, and a protective mechanism arranged on the outer side of the pressure ring force-bearing body; The pressure ring force-bearing body is a cylindrical structure, the fiber Bragg grating strain gauge and the fiber Bragg grating thermometer are connected, and the protection mechanism is used to protect the pressure ring force-bearing body, the fiber Bragg grating strain gauge and the fiber Bragg grating thermometer.

2. The small-volume fiber Bragg grating pressure ring according to claim 1, characterized in that: Three to six fiber grating strain gauges are arranged on the outer wall of the pressure ring force-bearing body along its circumference.

3. The small-volume fiber Bragg grating pressure ring according to claim 1, characterized in that: The fiber grating strain gauge and the fiber grating thermometer are connected via an optical cable.

4. The small-volume fiber Bragg grating pressure ring according to claim 1, characterized in that: The protection mechanism includes a protection ring sleeved on the outside of the pressure ring force-bearing body, and an upper protection cover and a lower protection cover respectively arranged on the upper and lower sides of the protection ring. An inner cavity is formed between the protection ring, the upper protection cover and the lower protection cover, and the pressure ring force-bearing body is located in the inner cavity.

5. The small-volume fiber Bragg grating pressure ring according to claim 4, characterized in that: The upper protective cover and the lower protective cover are welded to the upper and lower sides of the protective ring respectively.

6. The small-volume fiber Bragg grating pressure ring according to claim 1, characterized in that: The small-volume fiber grating pressure ring has a height lower than 50 mm.

7. The small-volume fiber Bragg grating pressure ring according to claim 2, characterized in that: The fiber grating strain gauges are evenly spaced and arranged along the circumferential direction of the outer wall of the pressure ring force-bearing body.

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