Composite material armoring device and method of flexible fiber grating sensor

Abstract

The invention discloses a composite material armoring device and method for a flexible fiber grating sensor, the device comprises feeding assemblies, a clamping assembly, a heating assembly and a cutting assembly, the number of the feeding assemblies is two, the feeding assemblies are oppositely arranged up and down, a grating fiber is arranged between the two feeding assemblies, and the feeding assemblies are used for outputting a prepreg tape and covering the grating fiber; the number of the clamping assemblies is two, the two clamping assemblies are oppositely arranged up and down, and the two clamping assemblies are used for pressing two layers of prepreg tapes; the heating assembly is used for heating the prepreg tape so as to melt the prepreg tape and armour the grating fiber; and the cutting assembly is used for cutting the armored grating fiber into a specific width. The prepreg tape laid on the two sides of the grating fiber is heated, wetted and then cooled, tight combination of the grating fiber and the fiber in the prepreg is achieved, the method has the advantages of being simple and convenient in process, excellent in interface performance and high in structural strength, the service life of the grating fiber sensor can be effectively prolonged, and the survival rate of the grating fiber sensor can be effectively increased.

Description

Technical Field

[0001] This invention relates to the technical field of fiber optic grating sensor armor, specifically to a composite material armoring device and method for a flexible fiber optic grating sensor. Background Technology

[0002] Grating fiber optic sensors are a type of fiber optic sensor. Grating fibers obtain sensing information by modulating the Bragg wavelength of the fiber through external physical parameters (temperature, strain, etc.). They have advantages such as resistance to electromagnetic interference, high sensitivity, small size, light weight, corrosion resistance, and non-conductivity, and are widely used in high-temperature and corrosive environments.

[0003] Composite materials are a critical component of large-scale structures in aerospace, military, and transportation fields, and the integrity of their connection structures is essential for ensuring the overall structural safety. Due to the complex nonlinear coupling factors in composite material connection structures, analyzing their strength and failure modes is extremely difficult. Therefore, flexible fiber optic grating sensors are needed to monitor, diagnose, assess, and predict the structural health status to ensure operational safety. However, fiber optic grating sensors are relatively fragile and prone to breakage during the composite material curing process due to resin shrinkage, leading to monitoring failure. Therefore, armor protection for fiber optic grating sensors is crucial.

[0004] Current methods for armoring fiber optic grating sensors suffer from problems such as complex processes, poor interface performance, large armor size, and impact on structural strength. Therefore, there is an urgent need for a composite material armoring device and method for flexible fiber optic grating sensors to solve these problems. Summary of the Invention

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides a composite material armoring device and method for flexible fiber optic grating sensors, solving problems such as complex processes, poor interface performance, large armoring dimensions, and impact on structural strength in existing grating fiber optic sensor armoring methods.

[0006] According to a first aspect of the present invention, a composite material armoring device for a flexible fiber Bragg grating sensor includes:

[0007] The feeding assembly is provided in two, which are arranged vertically opposite each other. The grating optical fiber is disposed between the two feeding assemblies. The feeding assembly is used to output the prepreg tape and make the prepreg tape cover the upper and lower sides of the grating optical fiber. Two clamping assemblies are provided, which are arranged vertically opposite each other. The two clamping assemblies are used to press the prepreg tapes on the upper and lower sides of the grating optical fiber together. A heating assembly is used to heat the prepreg tape to melt the prepreg tape and armor the grating optical fiber; A cutting component is used to divide the armored grating optical fiber into a preset width.

[0008] A composite material armoring device for a flexible fiber Bragg grating sensor according to an embodiment of the present invention has at least the following beneficial effects: In this embodiment, a prepreg tape is applied to both sides of the grating fiber using a pressing assembly, and then melted by a heating assembly. The molten prepreg tape is tightly bonded to the grating fiber under the pressure of the pressing assembly. The armored grating fiber is then divided using a cutting assembly. This method has the advantages of good interface compatibility and small armor size. It can complete the armoring of flexible grating fibers through simple steps, which is conducive to industrial production. Furthermore, the resulting armored grating fiber has high structural strength and is not easily damaged, which helps to improve the service life and survival rate of fiber optic grating sensors and ensure sensing accuracy.

[0009] According to some embodiments of the present invention, the feeding assembly includes a feeding roller and a take-up roller, the feeding roller is equipped with a prepreg roll, the prepreg roll rotates with the feeding roller to output a prepreg tape, and the take-up roller is used to take up the release paper peeled out from the prepreg roll.

[0010] According to some embodiments of the present invention, the clamping assembly includes a collection roller and a rolling flattening belt arranged at intervals, wherein two of the collection rollers in the two clamping assemblies are arranged opposite each other vertically, and two of the rolling flattening belts are arranged opposite each other vertically.

[0011] According to some embodiments of the present invention, the positions of the two collecting rollers are adjustable in the vertical direction, and the positions of the two rolling flattening belts are adjustable in the vertical direction.

[0012] According to some embodiments of the present invention, both the collecting roller and the rolling flattening belt are provided with pressure sensors, which are used to detect the pressure between the collecting roller and the rolling flattening belt and the prepreg belt.

[0013] According to some embodiments of the present invention, the heating assembly includes a heating box mechanism and a flattening belt heating mechanism. The clamping assembly is disposed in the heating box mechanism. Two flattening belt heating mechanisms are provided, and the two flattening belt heating mechanisms are respectively disposed on the two rolling flattening belts for heating the two rolling flattening belts.

[0014] According to some embodiments of the present invention, the heating temperature of the flattening belt heating mechanism is higher than the heating temperature of the heating box mechanism.

[0015] According to some embodiments of the present invention, the cutting assembly includes a plurality of cutting blades spaced apart along the width direction of the prepreg strip, the plurality of cutting blades being movable and adjustable relative to each other along the width direction of the prepreg strip.

[0016] According to some embodiments of the present invention, a collection component is further included for winding up the armored slit grating fiber, the collection component including a collection roller whose width matches the width of the armored slit grating fiber.

[0017] According to a second aspect of the present invention, a composite material armoring method for a flexible fiber Bragg grating sensor is characterized in that it is applicable to the above-mentioned composite material armoring device, and the armoring method includes: According to the preset monitoring matrix requirements, a grating is set on a blank optical fiber to obtain the grating optical fiber; The grating fiber is introduced between the two feeding components, and the two feeding components are controlled to output the prepreg tape and make the prepreg tape cover the upper and lower sides of the grating fiber; The pressing assembly is controlled to press the prepreg tape onto the upper and lower sides of the grating fiber; The heating component is controlled to heat the prepreg tape, and after cooling, the armored grating optical fiber is obtained; The cutting component is controlled to divide the armored grating optical fiber according to a preset width.

[0018] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 A schematic diagram of an embodiment of a composite material armoring device for a flexible fiber Bragg grating sensor provided by the present invention; Figure 2 A schematic diagram of an embodiment of the composite material armored grating optical fiber obtained by the armoring device provided by the present invention; Figure 3 The flowchart of one embodiment of a composite material armoring method for a flexible fiber Bragg grating sensor provided by the present invention is shown.

[0020] Icon labels: 110 prepreg rolls; 120 prepreg tapes; 130 optical fibers; 140 release paper; Feeding assembly 200; Feeding roller 210; Rewinding roller 220; Clamping assembly 300; collecting roller 310; first support rod 311; rolling flattening belt 320; second support rod 321; Heating component 400; heating box mechanism 410; flattening belt heating mechanism 420; Cutting assembly 500; cutting blade column 510; Collection component 600; collection roller 610. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0024] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0025] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of the present invention, not all embodiments.

[0026] The grating fiber 130 sensor is a type of fiber optic sensor. The grating fiber 130 obtains sensing information by modulating the Bragg wavelength of the fiber through external physical parameters (temperature, strain, etc.). It has the advantages of anti-electromagnetic interference, high sensitivity, small size, light weight, corrosion resistance, and non-conductivity, and is widely used in high temperature and corrosive environments.

[0027] Composite materials are a critical component of large-scale structures in aerospace, military, and transportation fields, and the integrity of their connection structures is crucial for ensuring the overall structural safety. Due to the complex nonlinear coupling factors in composite material connection structures, analyzing their strength and failure modes is extremely difficult. Therefore, flexible fiber optic grating sensors are needed to monitor, diagnose, assess, and predict the health status of the structure to ensure its safe operation. However, the grating fiber optic 130 sensor is relatively fragile and easily breaks during the composite material curing process due to resin shrinkage, leading to monitoring failure. Therefore, armor protection for the grating fiber optic 130 sensor is essential.

[0028] Current methods for armoring fiber Bragg grating (FBG) sensors suffer from problems such as complex processes, poor interface performance, large armor size, and impact on structural strength. Therefore, there is an urgent need for a composite material armoring device and method for flexible FBG sensors to address these issues.

[0029] To address the aforementioned issues, this invention proposes a composite material armoring device and method for flexible fiber Bragg grating sensors, which effectively solves problems such as complex processes, poor interface performance, large armoring dimensions, and impact on structural strength associated with existing grating fiber 130 sensor armoring methods.

[0030] refer to Figure 1 , Figure 2 and Figure 3 The following are embodiments of the composite material armoring device and method for a flexible fiber Bragg grating sensor of the present invention: Reference Figure 1 As shown, a composite material armoring device for a flexible fiber Bragg grating sensor according to an embodiment of the present invention includes a feeding assembly 200, a clamping assembly 300, a heating assembly 400, and a cutting assembly 500.

[0031] The system includes two feeding assemblies 200, which are arranged vertically opposite each other. The grating fiber 130 is located between the two feeding assemblies 200. The feeding assemblies 200 are used to output prepreg tape 120 and cover the upper and lower sides of the grating fiber 130. Two clamping assemblies 300 are also arranged vertically opposite each other. The clamping assemblies 300 are used to press the prepreg tape 120 on the upper and lower sides of the grating fiber 130 together. The heating assembly 400 is used to heat the prepreg tape 120 to melt it and armor the grating fiber 130. The cutting assembly 500 is used to cut the armored grating fiber 130 into specific widths.

[0032] In this embodiment of the invention, a prepreg tape 120 is output from the prepreg material. The pressing assembly covers both sides of the grating fiber 130 with the prepreg tape 120 and melts it with the heating assembly 400. The molten prepreg tape 120 is tightly bonded to the grating fiber 130 under the pressure of the pressing assembly. Then, the armored grating fiber 130 is divided by the cutting assembly 500. This method has the advantages of good interface compatibility and small armor size. The armoring of the flexible grating fiber 130 can be completed in a simple step, which is conducive to industrial production. Moreover, the resulting armored grating fiber 130 has high structural strength and is not easily damaged, which helps to improve the service life and survival rate of the fiber optic grating sensor and ensure sensing accuracy.

[0033] Preferably, the prepreg material is not limited to any particular reinforcing material, including but not limited to carbon fiber, glass fiber, basalt fiber, aramid fiber, ultra-high molecular weight polyethylene fiber, and poly(p-phenylene benzodioxazole) fiber; the prepreg matrix material is not limited and can be adjusted according to the target material. The matrix can be thermoplastic resins such as polypropylene (PP), polyethylene (PE), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), and polyether ketone ketone (PEI); or it can be thermosetting resins such as epoxy resin, phenolic resin, bismaleimide, and cyanate ester resin. It should be noted that the prepreg material used for armor should be similar to or consistent with the composition (resin and fiber) of the final composite material application component.

[0034] In this embodiment, the feeding assembly 200 includes a feeding roller 210 and a take-up roller 220. The two feeding rollers 210 of the two feeding assemblies 200 are arranged vertically opposite each other. A prepreg roll 110 is mounted on the feeding roller 210. During operation, the two feeding rollers 210 rotate synchronously, and the prepreg roll 110 outputs a prepreg tape 120 as the feeding rollers 210 rotate. At the same time, the grating optical fiber 130 is guided between the two feeding rollers 210, and the output prepreg tape 120 moves in the same direction with the grating optical fiber 130, so that the prepreg tape 120 gradually covers both sides of the grating optical fiber 130, resulting in... Figure 2 The layered structure shown.

[0035] The take-up roller 220 is located beside the feed roller 210 and is used to take up the release paper 140 peeled out from the prepreg roll 110 for reuse in the preparation of the prepreg roll 110 or for storage of the armored grating optical fiber 130, thereby reducing manufacturing costs. It should be noted that the rotation direction of the take-up roller 220 is opposite to that of the feed roller 210 to ensure smooth feeding and winding.

[0036] The clamping assembly 300 includes spaced-apart collecting rollers 310 and rolling flattening belts 320. The two collecting rollers 310 and the two rolling flattening belts 320 are arranged opposite each other. The grating fiber 130 and the prepreg tapes 120 on the upper and lower sides pass between the two collecting rollers 310 and the two rolling flattening belts 320 in sequence. The pressure of the collecting rollers 310 causes the prepreg tapes 120 on both sides to partially adhere, which has a certain fixing effect, but cannot form a unified whole. Therefore, the pressure of the rolling flattening belts 320 further presses the prepreg tapes 120 on the upper and lower sides together, so as to achieve the purpose of flexibly armoring the grating fiber 130 with prepreg.

[0037] Furthermore, the positions of the two collecting rollers 310 are adjustable in the vertical direction, thereby controlling the distance and pressure between the two collecting rollers 310 to adapt to the armoring requirements of different specifications of grating optical fibers 130. Similarly, the positions of the two rolling flattening belts 320 are adjustable in the vertical direction, thereby controlling the distance and pressure between the two rolling flattening belts 320 to adapt to the armoring requirements of different specifications of grating optical fibers 130 and achieve a good armoring effect.

[0038] In this embodiment, the collecting roller 310 is connected to a first support rod 311, and the rolling flattening belt 320 is connected to a second support rod 321. The first support rod 311 and the second support rod 321 are telescopic rod structures, which can drive the collecting roller 310 and the rolling flattening belt 320 to move in the up and down direction, respectively. By controlling the telescopic length of the first support rod 311 and the second support rod 321, the pressure between the two collecting rollers 310 and the pressure between the two rolling flattening belts 320 can be adjusted, respectively.

[0039] In some other embodiments, the positions of the collecting roller 310 and the rolling flattening belt 320 can also be adjusted by other structures, such as threaded rods mating with threaded holes.

[0040] Furthermore, both the collecting roller 310 and the rolling flattening belt 320 are equipped with pressure sensors. The pressure sensors are used to detect the pressure between the collecting roller 310 and the rolling flattening belt 320 and the prepreg belt 120, thereby quantifying the production process parameters and facilitating the adjustment of the collecting roller 310 and the rolling flattening belt 320 according to the real-time pressure, so as to accurately control the pressing pressure.

[0041] Furthermore, in some other embodiments, the collecting roller 310 and the rolling flattening belt 320 are also provided with an anti-stick layer, which can be made of materials such as polytetrafluoroethylene, silicone, polyurethane, and non-stick ceramics, to prevent the collecting roller 310 and the rolling flattening belt 320 from sticking to the prepreg belt 120.

[0042] The heating assembly 400 of this embodiment includes a heating box mechanism 410 and a flattening belt heating mechanism 420. The clamping assembly 300 is disposed in the heating box mechanism 410. Two flattening belt heating mechanisms 420 are provided, which are respectively disposed on two rolling flattening belts 320 for heating the two rolling flattening belts 320. The heating box mechanism 410 heats the prepreg tape 120, which reduces the viscosity of the resin in the prepreg tape 120 and increases its fluidity. Combined with the pressure of the collecting roller 310 and the rolling flattening belt 320, the upper and lower layers of prepreg tape 120 are tightly bonded to the grating optical fiber 130, thereby achieving flexible armoring.

[0043] In order to ensure that the resin matrix in the prepreg tape 120 has a good melting effect, the temperature of the heating box mechanism 410 can be adjusted according to the type of resin and process parameters in the prepreg tape 120. For thermosetting resins, the temperature should not exceed its rapid curing temperature, which is usually 20°C to 40°C lower than the first curing plateau temperature and rapid curing temperature of the resin. For thermoplastic resins, the oven temperature should be between the melting temperature and the pyrolysis temperature, which is usually 20°C to 40°C higher than the melting temperature of the resin.

[0044] Furthermore, in order to ensure a good bonding effect between the prepregs on the rolling flattening belts 320, the heating temperature of the flattening belt heating mechanism 420 should be slightly higher than the heating temperature of the heating box mechanism 410, so as to form a gradual temperature gradient, thereby further reducing the resin viscosity and improving the resin flowability based on the heating box mechanism 410, in order to cooperate with the pressing effect of the rolling flattening belts 320. In this embodiment of the invention, the heating temperature of the flattening belt heating mechanism 420 is about 10°C higher than the heating temperature of the heating box mechanism 410.

[0045] In this embodiment of the invention, the cutting assembly 500 includes a plurality of cutting blades 510 spaced apart along the width direction of the prepreg tape 120. The plurality of cutting blades 510 are relatively movable and adjustable along the width direction of the prepreg tape 120, thereby meeting the cutting requirements of grating optical fibers 130 of different specifications, and obtaining armored grating optical fibers 130 of a specific width for subsequent use.

[0046] In this embodiment of the invention, the armoring device further includes a collecting component 600 for winding up the armored grating optical fiber 130 after being cut. The collecting component 600 includes a collecting roller 610, the width of which matches the width of the armored grating optical fiber 130 after being cut. As the armored grating optical fiber 130 is output from the cutting component 500, the collecting roller 610 rotates to drive the grating optical fiber 130 to be wound along the outer surface of the collecting roller 610, thereby ensuring that the grating optical fiber 130 after being completed with flexible armor can be wound up in an orderly manner for easy storage.

[0047] Reference Figure 3 As shown, this embodiment of the invention also provides a composite material armoring method for a flexible fiber Bragg grating sensor, characterized in that it is applicable to the above-mentioned composite material armoring device, and the armoring method includes: Step S100: According to the preset monitoring matrix requirements, set a grating on the blank optical fiber to obtain grating optical fiber 130; Step S200: Introduce the grating fiber 130 between the two feeding components 200, and control the two feeding components 200 to output the prepreg tape 120 and make the prepreg tape 120 cover the upper and lower sides of the grating fiber 130. Step S300: Control the pressing assembly to press the prepreg tape 120 onto the upper and lower sides of the grating optical fiber 130; Step S400: Control the heating component 400 to heat the prepreg tape 120, and after cooling, obtain the armored grating optical fiber 130; Step S500: Control the cutting component 500 to cut the armored grating optical fiber 130 according to the preset width.

[0048] In step S100, gratings can be set at any point on the blank optical fiber according to the preset detection requirements. The grating spacing is arbitrarily adjustable, thereby realizing the manufacturing requirements of various different grating matrices and obtaining the grating optical fiber 130 to be armored.

[0049] In step S200, the grating fiber 130 is introduced between two feeding rollers 210. One end of each of the two prepreg rolls 110 is fixed to the grating fiber 130. After the device is started, the grating fiber 130 moves forward while the two feeding rollers 210 rotate synchronously. The grating fiber 130 drives the prepreg tape 120 to be output from the pre-tensioned roll and follow the grating fiber 130. As the grating fiber 130 and the prepreg tapes 120 on the upper and lower sides move synchronously, the prepreg tape 120 covers the upper and lower sides of the grating fiber 130.

[0050] In step S300, the stack consisting of the grating fiber 130 and the prepreg tapes 120 on the upper and lower sides is sequentially introduced into the gap between the two collecting rollers 310 and the gap between the two rolling flattening tapes 320. The distance between the two collecting rollers 310 and the distance between the two rolling flattening tapes 320 are adjusted to control the pressure applied to the stack consisting of the grating fiber 130 and the prepreg tapes 120 on the upper and lower sides.

[0051] In step S400, the heating box mechanism 410 is controlled to heat and initially melt the resin in the prepreg tape 120. The flattening tape heating mechanism 420 is controlled to heat the rolling flattening tape 320, so that the temperature of the rolling flattening tape 320 is higher than the internal temperature of the heating box, so that the resin melts further, impregnates the grating optical fiber 130, and after cooling, they are tightly bonded to form the armored grating optical fiber 130.

[0052] In step S500, the armored grating fiber 130 is introduced into the cutting assembly 500, and the distance between the multiple cutting blades 510 is adjusted to divide the armored grating fiber 130 according to the preset width. The diced prepreg armored grating fiber 130 is collected by the collecting roller 610 for easy storage.

[0053] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A composite material armoring device for a flexible fiber Bragg grating sensor, characterized in that, include: The feeding assembly is provided in two, which are arranged vertically opposite each other. The grating optical fiber is disposed between the two feeding assemblies. The feeding assembly is used to output the prepreg tape and make the prepreg tape cover the upper and lower sides of the grating optical fiber. Two clamping assemblies are provided, which are arranged vertically opposite each other. The two clamping assemblies are used to press the prepreg tapes on the upper and lower sides of the grating optical fiber together. A heating assembly is used to heat the prepreg tape to melt the prepreg tape and armor the grating optical fiber; A cutting component is used to divide the armored grating optical fiber into a preset width.

2. The composite material armoring device according to claim 1, characterized in that: The feeding assembly includes a feeding roller and a take-up roller. The feeding roller is equipped with a prepreg roll, which rotates with the feeding roller to output a prepreg tape. The take-up roller is used to take up the release paper peeled out from the prepreg roll.

3. The composite material armor device according to claim 1, characterized in that: The clamping assembly includes a collection roller and a rolling flattening belt arranged at intervals. The two collection rollers and the two rolling flattening belts in the two clamping assemblies are arranged opposite each other vertically.

4. The composite material armor device according to claim 3, characterized in that: The positions of the two collecting rollers are adjustable in the vertical direction, and the positions of the two rolling flattening belts are adjustable in the vertical direction.

5. The composite material armoring device according to claim 3, characterized in that: Both the collecting roller and the rolling flattening belt are equipped with pressure sensors, which are used to detect the pressure between the collecting roller and the rolling flattening belt and the prepreg belt.

6. The composite material armoring device according to claim 1, characterized in that: The heating assembly includes a heating box mechanism and a flattening belt heating mechanism. The clamping assembly is located inside the heating box mechanism. There are two flattening belt heating mechanisms, which are respectively located on the two rolling flattening belts and are used to heat the two rolling flattening belts.

7. The composite material armoring device according to claim 6, characterized in that: The heating temperature of the flattening belt heating mechanism is higher than that of the heating box mechanism.

8. The composite material armoring device according to claim 1, characterized in that: The cutting assembly includes a plurality of cutting blades spaced apart along the width direction of the prepreg strip, and the plurality of cutting blades are movable and adjustable relative to each other along the width direction of the prepreg strip.

9. The composite material armoring device according to claim 1, characterized in that: It also includes a collection component for winding up the armored and segmented grating fiber, the collection component including a collection roller whose width matches the width of the armored and segmented grating fiber.

10. A composite material armoring method for a flexible fiber Bragg grating sensor, characterized in that, The composite material armoring device according to any one of claims 1 to 9, the armoring method comprising: According to the preset monitoring matrix requirements, a grating is set on a blank optical fiber to obtain the grating optical fiber; The grating fiber is introduced between the two feeding components, and the two feeding components are controlled to output the prepreg tape and make the prepreg tape cover the upper and lower sides of the grating fiber; The pressing assembly is controlled to press the prepreg tape onto the upper and lower sides of the grating fiber; The heating component is controlled to heat the prepreg tape, and after cooling, the armored grating optical fiber is obtained; The cutting component is controlled to divide the armored grating optical fiber according to a preset width.

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