CN112192865B

CN112192865B - A continuous manufacturing process of pultruded composite sheet with built-in FBG sensor

Info

Publication number: CN112192865B
Application number: CN202010969518.1A
Authority: CN
Inventors: 吕晓轩; 智杰颖; 袁立业; 杨禹; 宋英俊
Original assignee: Shanxi Institute of Coal Chemistry of CAS
Current assignee: Shanxi Institute of Coal Chemistry of CAS
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2021-10-15
Anticipated expiration: 2040-09-15
Also published as: CN112192865A

Abstract

The invention belongs to the field of composite material preparation and non-destructive monitoring, and in particular relates to a continuous manufacturing process of a pultruded composite material sheet with a built-in FBG sensor. The continuous manufacturing process includes fiber grating pre-processing, carbon fiber sheet pultrusion, cutting of the formed composite material, and post-processing of the fiber grating sensor leads. The continuous manufacturing process effectively solves the problem that the lead joint of the fiber grating sensor on a predetermined length is difficult to lead out during the continuous manufacturing process of pultrusion. Under the condition that the pultrusion efficiency is not significantly reduced, the adverse effect of the built-in joint method on the mechanical properties of the composite pultruded sheet is eliminated. A reliable and stable solution is provided for the manufacture of intelligently pultruded composite material sheets and the smooth lead-out of composite material cross-section optical fiber leads.

Description

Continuous manufacturing process of pultrusion composite material plate internally implanted with FBG sensor

Technical Field

The invention belongs to the field of composite material preparation and nondestructive monitoring, and particularly relates to a continuous manufacturing process of a pultrusion composite material plate internally implanted with an FBG sensor.

Background

With the continuous acceleration of social economy and urbanization, the construction of national engineering facilities and urban infrastructure has been rapidly developed in the past period, and many buildings, bridges and engineering structures have been put into use for decades or even longer. As the use time of these infrastructures increases, the aging of the infrastructure and the safety risk of the infrastructure increases, so that the monitoring of the state of the infrastructure and the maintenance and repair of the infrastructure become important issues to be faced in the next social development.

The molding process of the carbon fiber reinforced composite material unidirectional plate is to impregnate fibers with resin, then solidify the fibers in a mold and continuously perform pultrusion molding. The carbon fiber reinforced composite material has the characteristics of high tensile strength, good corrosion resistance, good shock resistance, good impact resistance and the like, can give full play to the strength and the elastic modulus of the carbon fiber, and has wide application in the aspects of shear reinforcement and prestress reinforcement of bridges and tunnels. With the continuous progress of reinforcing and reinforcing technology and the continuous development of on-line monitoring technology, the implantation of sensors in the pultrusion composite material plate structure for the on-line monitoring of the structure health of facilities has become a key development direction in the field of building reinforcement.

The Fiber Bragg Grating (FBG) sensor has the characteristics of simple structure, strong electromagnetic interference resistance, convenience for implantation, easiness in forming a net and the like, and has obvious advantages in-situ online monitoring compared with metal strain gauges and other types of sensors. Of course, the FBG sensor has some disadvantages, the most important of which is that the optical fiber has poor shear resistance, and the grating region is used as a measurement sensitive component, which is fragile and easy to break, and once the grating region of the grating is broken, the monitoring signal is interrupted, which undoubtedly brings great difficulty to the implantation of the FBG sensor in the composite material pultruded plate, the sensor lead wire and the continuous production of the composite material unidirectional plate.

In order to solve the above problems, a series of researches have been carried out in recent years, and specifically, patent 200810217549.0 discloses a system and a method for embedding a fiber grating sensor in a fiber polymer composite material, wherein a single optical fiber is introduced into a fiber bundle from an introduction die and passes through a pultrusion die together. Such a solution does not allow for pre-tensioning of the FBG sensor fiber, which makes it difficult to precisely locate the FBG sensor in the composite material during the implantation process. Patent 200910057487.6 discloses a system and method for preparing an intelligent rib of a fiber grating composite material, the system and method combines the characteristics of pultrusion and compression molding, an FBG sensor is implanted into the middle position of two preformed bodies, and connectors are processed at two ends, on one hand, the production efficiency is reduced, on the other hand, when the system and method are applied to pultrusion plates, because the thickness of the plates is much smaller than the diameter of the rib, the minimum thickness is only 0.9mm-1.4mm, and embedded lead connectors are not easy to be embedded into two ends of an optical fiber. Patent 201710223794.1 discloses a system and method for continuously implanting fiber grating into pultruded composite material, which adds a pre-stretching device in the fiber grating implanting system to avoid the breaking of the optical fiber, but does not consider the problem that the fiber lead of the FBG sensor is led out from the cut end face of the composite material, and is difficult to realize the continuous manufacturing of the composite material pultruded plate with internally implanted long gauge length FBG sensor.

In summary, there is a need for a continuous manufacturing process and method for a pultrusion composite material plate with an FBG sensor built therein, which is significant for realizing stable implantation and continuous manufacturing and use of the FBG sensor in a pultrusion intelligent composite material.

Disclosure of Invention

The invention mainly aims to solve the key problem of providing a continuous manufacturing process of a pultrusion composite material plate with an internally-arranged FBG sensor, and the continuous manufacturing of the pultrusion intelligent composite material plate with the internally-arranged FBG sensor is realized on the premise of ensuring the smooth survival of the FBG sensor in the pultrusion process of the composite material.

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

a continuous manufacturing process of a pultrusion composite material plate internally implanted with FBG sensors comprises the following steps:

step 1, fiber grating pretreatment: according to the processing and manufacturing requirements of the pultrusion composite material plate, a plurality of grating areas are carved on continuous optical fibers in advance, the continuous optical fibers carved with the grating areas are soaked in a surface modifier for surface treatment and heating and drying, and after the surface modifier is completely dried, a self-lubricating coating is uniformly coated on the preset cutting position of each section of the pultrusion composite material plate;

step 2, pultrusion of the carbon fiber plate: leading the coiled carbon fiber material out of the fiber creel, sequentially passing through a fiber guide device and a resin impregnation device in sequence to ensure that the fiber bundle is uniformly impregnated with resin, and leading the carbon fiber material impregnated with the resin to pass through a fiber bundling plate through an optical fiber conveying device; leading out the continuous optical fiber carved with a plurality of grating areas from the optical fiber concentrator, passing through a guide hole at a preset position of the fiber bundling plate by an optical fiber conveyer, and uniformly surrounding the continuous optical fiber carved with a plurality of grating areas by a carbon fiber material; then the materials enter a heating forming die together for curing forming, and the formed composite material plate is continuously conveyed to a plate traction device;

step 3, cutting the formed composite material plate: after the composite material plate is conveyed to a preset cutting position of the optical fiber by the plate traction device, the composite material plate is cut, and the composite material plate is cut by adopting a two-stage cutting device:

firstly, performing transverse cutting, and controlling a cutter to cut from the edge of the composite material plate to the part in which the fiber bragg grating is implanted so as to ensure that the part in the middle of the composite material plate in which the optical fiber is implanted is still continuous; after the transverse cutting of the composite material plate is finished, continuously utilizing a longitudinal cutting tool to perform secondary cutting;

and 4, post-processing of the FBG sensor lead wires: and (3) carrying out post-treatment on the optical fiber outgoing lines at the sections of the two ends of the cut composite material plate, stripping the carbon fibers around the cut optical fibers by using a wire stripper, reserving the complete bare optical fiber outgoing lines, and after the bare optical fiber outgoing lines are welded with the FC/APC jumper, completing the implantation and continuous manufacturing of the FBG sensor in the pultruded composite material plate.

In the above steps, through the surface pretreatment of the optical fiber, the stable implantation of the FBG sensor, the continuous cutting and the post-treatment process, the damage of the mechanical property of the composite material plate caused by the implantation of the FBG sensor can be reduced to the maximum extent, and the interface bonding force between the optical fiber and the composite material is increased. Meanwhile, through a continuous cutting process, the preparation efficiency and stability are improved on the premise of not damaging the FBG sensor and the optical fiber lead.

Further, the difference of the central wavelengths of the grating regions in the step 1 is 10-15 nm, so that the central wavelengths of the intelligent carbon fiber composite material plate after the drift of the grating regions in the using process are prevented from overlapping, and the accuracy and precision of the strain test are effectively guaranteed.

Further, the surface modifier in the step 1 is a coupling agent, silica sol or a blending and compounding solution of the coupling agent and the silica sol, and the surface modifier is dissolved by an organic solvent before the continuous optical fiber engraved with a plurality of grating areas is immersed, so that the viscosity of the immersion solution is ensured to be proper, and the immersion uniformity of the surface modifier on the surface of the optical fiber is improved.

Further, in the step 1, the preset cutting position of the optical fiber is a position where the length of the optical fiber reaches the preset length of the composite material plate, the preset cutting position on the continuous optical fiber is marked, and cutting can be more accurate in a subsequent cutting process.

Further, the self-lubricating coating in the step 1 is made of polytetrafluoroethylene or ultra-high molecular weight polyethylene, the thickness of the self-lubricating coating is 0.2-0.4 mm, and the thickness of the self-lubricating coating is controlled, so that on one hand, small adhesion between an optical fiber lead and a composite material is ensured, on the other hand, good mechanical property of a cutting part of the composite material is ensured, and the optical fiber position of the cutting section is prevented from splitting; the length of the self-lubricating coating is 1-1.5 m, and the optical fiber leads with enough length are reserved on the cross sections of the two ends of the composite material plate.

Further, in the step 2, the preset position of the fiber bundling plate is determined according to the quantity of the optical fiber gratings to be implanted into the composite material plate, the implanted FBG sensors are symmetrically distributed along the central position of the fiber bundling plate, and the distance between two adjacent bundles of optical fibers is not less than 10 mm. If the distance between the two optical fibers is too close, it is difficult to simultaneously peel the two optical fibers from the cured and cut composite material, and the post-processing process increases the risk of breaking the FBG sensor leads.

Further, the two-stage cutting device in step 3 comprises: the device comprises a fixed frame, a lifting device, a longitudinal slide rail, a transverse cutting system and a longitudinal cutting system; the device fixing frame is used for fixing the cutting device and conveying the formed composite material; the lifting device is connected below the top surface of the fixed frame of the device and is used for controlling the feeding of the cutter assembly in the vertical direction; the longitudinal slide rail is connected below the lifting device and used for driving the cutter assembly to move in the front-back direction and feed and cut; the transverse cutting system is connected to the longitudinal slide rail and is used for transverse cutting of the pultrusion composite material perpendicular to the traction direction; the longitudinal cutting system is connected to the longitudinal sliding rail, arranged behind the transverse cutting system and used for longitudinally cutting the pultrusion composite material along the traction direction after the pultrusion composite material is transversely cut.

Still further, the device fixing frame comprises a fixing base, a frame upright post and an upper cover plate, wherein the fixing base is provided with a material conveying groove, and a material conveying guide roller is arranged in the material conveying groove; the lifting device is driven by electricity and comprises a front group of lifting upright posts and a rear group of lifting upright posts, wherein the two groups of lifting upright posts synchronously lift in the operation process and are provided with a descending limiting device.

Still further, the transverse cutting system comprises a primary transverse guide rail, a primary limiting device, a transverse extending arm, a transverse cutting knife wheel and a driving motor; the primary transverse guide rail is connected to the lower portion of the longitudinal slide rail, the primary limiting device is arranged below the primary transverse guide rail and can move towards the center along the edges of the two ends of the primary transverse guide rail, the primary limiting device limits the minimum distance between the two transverse cutting knife wheels to be 2mm, the transverse extending arm is connected with the primary limiting device through a transverse rotating shaft and can rotate around the transverse rotating shaft, the transverse cutting knife wheels and the driving motor are respectively arranged on the front side and the rear side of the transverse extending arm, the driving motor drives the transverse cutting knife wheels to rotate in the cutting process, the installation knife edges of the transverse cutting knife wheels are perpendicular to the conveying direction of the composite material, and the thickness of the knife edges of the transverse cutting knife wheels is 0.6-0.8 mm;

the longitudinal cutting system comprises a secondary transverse guide rail, a secondary limiting device, a longitudinal extending arm, a longitudinal cutting knife wheel and a driving motor; the two-stage transverse guide rail is connected to the lower portion of the longitudinal sliding rail, the left two-stage limiting device and the right two-stage limiting device are arranged on the two-stage transverse guide rail and used for adjusting the distance between the two longitudinal cutting knife wheels, the two-stage limiting device limits the minimum distance between the two longitudinal cutting knife wheels to be 2mm, the longitudinal extending arm is connected with the two-stage limiting device through a longitudinal rotating shaft, the longitudinal extending arm can rotate around the longitudinal rotating shaft, the longitudinal cutting knife wheels and the driving motor are respectively installed on two sides of the longitudinal extending arm, the driving motor drives the longitudinal cutting knife wheels to rotate in the cutting process, the installation knife edge direction of the longitudinal cutting knife wheels is parallel to the conveying direction of the composite material, and the thickness of the knife edge of the longitudinal cutting knife wheels is 0.6-0.8 mm.

Further, the transverse cutting in the step 3 is to stop cutting at a position 2-3 mm near the optical fiber lead, so that the section of the composite material plate is cut smoothly, and the part of the plate where the optical fiber lead is implanted is kept continuous. The minimum cutting distance can be set to reduce the content of fiber and resin coated around the optical fiber lead as much as possible on the premise of ensuring the optical fiber lead to be intact, and the optical fiber lead in the post-treatment process can be conveniently stripped.

Compared with the prior art, the invention has the following advantages:

the pultrusion device and the continuous manufacturing method of the composite material internally implanted with the FBG sensor effectively solve the problem that the lead joint of the fiber bragg grating sensor on the preset length is difficult to lead out in the pultrusion continuous manufacturing process. Under the condition of ensuring that the pultrusion efficiency is not obviously reduced, the adverse effect of a built-in joint method on the mechanical property of the composite material pultruded plate is eliminated. The device and the manufacturing process method can complete the implantation and lead wire of the FBG sensor only by simple pretreatment of the optical fiber and post-treatment of the formed composite material, and provide a reliable and stable scheme for manufacturing the intelligent pultrusion composite material plate.

Drawings

FIG. 1 is a view showing the structure of an apparatus according to the present invention;

FIG. 2 is a schematic view of a completed pultruded composite panel with an embedded fiber grating according to the present invention;

FIG. 3 is an overall schematic view of the two-stage cutting apparatus of the present invention;

FIG. 4 is a front view of the two-stage cutting apparatus of the present invention;

FIG. 5 is a side view of the two-stage cutting apparatus of the present invention;

the device comprises a base, a fiber guide device, a resin impregnation device, a fiber bundling plate, a continuous optical fiber bundle, a plate drawing device, a two-stage cutting device, a grating area, a carbon fiber bundle, a fiber guide device, a resin impregnation device, a fiber bundling plate, a continuous optical fiber bundle, a fiber concentrator, a fiber conveying device, a heating forming die, a plate drawing device, a two-stage cutting device, a grating area, a fiber bundle and a fiber splicing wire, wherein 6 is a carbon fiber material, 7 is a fiber creel, 8 is a fiber guide device, 9 is a resin impregnation device, 10 is a fiber bundling plate, 11 is a continuous optical fiber carved with a plurality of grating areas, 12 is an optical fiber concentrator, 13 is an optical fiber conveying device, 14 is a heating forming die, 15 is a plate drawing device, 16 is a two-stage cutting device, 17 is a grating area, 18 is a carbon fiber bundle, 19 is an FC/APC jumper wire, and 20 is an optical fiber outgoing wire; 1 is a device fixing frame, 2 is a lifting device, 3 is a longitudinal slide rail, 4 is a transverse cutting system, and 5 is a longitudinal cutting system; 101 is a fixed base, 102 is a frame upright post, 103 is an upper cover plate, 104 is a material conveying groove, and 105 is a material conveying guide roller; 201 is a lifting upright post, and 202 is a descending limiting device; 401 is a primary transverse guide rail, 402 is a primary limiting device, 403 is a transverse extending arm, 404 is a transverse cutting knife wheel, 405 is a driving motor, and 406 is a transverse rotating shaft; 501 is a secondary transverse guide rail, 502 is a secondary limiting device, 503 is a longitudinal extending arm, 504 is a longitudinal cutting knife wheel, 505 is a driving motor, and 506 is a longitudinal rotating shaft.

Detailed Description

The invention is further elucidated with reference to the drawing. The following description is given for the purpose of explanation and not limitation.

Example 1

step 1, fiber grating pretreatment: according to the processing and manufacturing requirements of the pultrusion composite material plate, a plurality of grating areas 17 are carved on continuous optical fibers in advance, the continuous optical fibers 11 carved with the grating areas are soaked in a surface modifier for surface treatment and heating and drying, and after the surface modifier is completely dried, self-lubricating coatings are uniformly coated on the preset cutting positions of the continuous optical fibers carved with the grating areas according to the specified length of each section of pultrusion composite material plate;

the 3 grating grid regions are engraved on the continuous optical fiber, the central wavelength of each grating grid region is different, the central wavelength of each grating grid region is 1525nm, 1540nm and 1555nm, the central wavelengths of the intelligent carbon fiber composite material plate after the drift of each grid region are prevented from overlapping in the using process, and the accuracy and precision of the strain test are effectively guaranteed.

The surface modifier adopts a coupling agent, and is dissolved by acetone before the continuous optical fiber engraved with a plurality of grating areas is immersed, so that the viscosity of an immersion solution is ensured to be lower than 300mPa.s, and the immersion uniformity of the surface modifier on the surface of the optical fiber is improved.

The length of each section of pultruded composite material plate is 10m, the preset cutting position of the optical fiber is the position where the length of the optical fiber reaches the preset length of 10m of the composite material plate, and the preset cutting positions on the continuous optical fiber at intervals of 10m are marked.

The self-lubricating coating contains polytetrafluoroethylene, and the thickness of self-lubricating coating is 0.3mm, and the thickness of control self-lubricating coating guarantees on the one hand that optic fibre lead wire and combined material are less adhesion, and on the other hand guarantees the combined material and cuts the better mechanical properties in position, prevents to cut the optic fibre position of cross-section and takes place the splitting.

The length of the self-lubricating coating is 1.5m, and the optical fiber leads with enough length are reserved on the cross sections of the two ends of the composite material plate.

Step 2, pultrusion of the carbon fiber plate: the coiled carbon fiber material 6 is led out from a fiber creel 7 and sequentially passes through a fiber guide device 8 and a resin impregnation device 9 in sequence, and the carbon fiber material impregnated with resin passes through an optical fiber conveying device 13 and passes through a fiber bundling plate 10; leading out the continuous optical fiber 11 carved with a plurality of grating areas from an optical fiber concentrator 12, passing through a guide hole at a preset position of a fiber bundling plate 10 by an optical fiber conveying device 13, and uniformly surrounding the continuous optical fiber 11 carved with a plurality of grating areas 16 by a carbon fiber material impregnated with resin; after passing through the fiber bundling plate 10, the resin-impregnated carbon fiber material and the continuous optical fibers 11 engraved with the plurality of grating areas 16 enter a heating forming die 14 together for curing forming, and the formed composite material plate is continuously conveyed to a plate traction device 15;

the number of the optical fiber gratings to be implanted in the composite material pultrusion plate is 1, and the implanted optical fiber gratings are located in the center of the fiber bundling plate 10.

Step 3, cutting the formed composite material plate: after the composite material plate is conveyed to a preset cutting position of the optical fiber by the plate traction device 15, the composite material plate is cut, and the composite material plate is cut by adopting a two-stage cutting device 16:

the two-stage cutting device 16 includes: the device comprises a device fixing frame 1, a lifting device 2, a longitudinal slide rail 3, a transverse cutting system 4 and a longitudinal cutting system 5; the device fixing frame 1 comprises a fixing base 101, a frame upright post 102 and an upper cover plate 103, wherein the fixing base 101 is provided with a material conveying groove 104, and a material conveying guide roller 105 is arranged in the material conveying groove and used for fixing the cutting device and conveying the formed composite material; the lifting device 2 is connected below the top surface of the device fixing frame 1 and used for controlling the feeding of the cutter assembly in the vertical direction, the driving mode of the lifting device 2 is electric driving and comprises a front group of lifting upright columns 201 and a rear group of lifting upright columns 201, the two groups of lifting upright columns 201 synchronously lift in the operation process, and a descending limiting device 202 is arranged; the longitudinal slide rail 3 is connected below the lifting device 2 and used for driving the cutter assembly to move in the front-back direction and feed and cut; the transverse cutting system 4 is connected to the longitudinal slide rail 3 and is used for transverse cutting of the pultruded composite material perpendicular to the traction direction, and the transverse cutting system 4 comprises a primary transverse guide rail 401, a primary limiting device 402, a transverse extending arm 403, a transverse cutting knife wheel 404 and a driving motor 405; the primary transverse guide rail 401 is connected to the lower portion of the longitudinal slide rail 3, the primary limiting device 402 is arranged below the primary transverse guide rail 401 and can move towards the center along the edges of two ends of the primary transverse guide rail 401, the primary limiting device 402 limits the minimum distance between the two transverse cutting knife wheels 404 to be 2mm, the transverse extending arm 403 is connected with the primary limiting device 402 through a transverse rotating shaft 406, the transverse extending arm 403 can rotate around the transverse rotating shaft 406, the transverse cutting knife wheels 404 and the driving motor 405 are respectively arranged on the front side and the rear side of the transverse extending arm 403, the driving motor 405 drives the transverse cutting knife wheels 404 to rotate in the cutting process, the installation knife edge direction of the transverse cutting knife wheels 404 is perpendicular to the composite material conveying direction, and the thickness of the cutting edge of the transverse cutting knife wheels 404 is 0.6-0.8 mm; the longitudinal cutting system 5 is connected to the longitudinal sliding rail 3, is arranged behind the transverse cutting system 4, and is used for longitudinally cutting the pultruded composite material along the traction direction after the transverse cutting, and the longitudinal cutting system 5 comprises a secondary transverse guide rail 501, a secondary limiting device 502, a longitudinal extending arm 503, a longitudinal cutting knife wheel 504 and a driving motor 505; the two-stage transverse guide rail 501 is connected to the lower portion of the longitudinal slide rail 3, the left two-stage limiting device 502 and the right two-stage limiting device 502 are arranged on the two-stage transverse guide rail 501 and used for adjusting the distance between the two longitudinal cutting knife wheels 504, the two-stage limiting device 502 limits the minimum distance between the two longitudinal cutting knife wheels 504 to be 2mm, the longitudinal extending arm 503 is connected with the two-stage limiting device 502 through a longitudinal rotating shaft 506 and can rotate around the longitudinal rotating shaft 506, the longitudinal cutting knife wheels 504 and a driving motor 505 are respectively arranged on two sides of the longitudinal extending arm, the driving motor 505 drives the longitudinal cutting knife wheels 504 to rotate in the cutting process, the installation blade direction of the longitudinal cutting knife wheels 504 is parallel to the conveying direction of the composite material, and the blade thickness of the longitudinal cutting knife wheels 504 is 0.6-0.8 mm.

And the transverse cutting is stopped at a position which is 3mm close to the optical fiber lead, so that the section of the composite material plate is smoothly cut, and the part of the plate, which is implanted with the optical fiber lead, is kept continuous.

And 4, post-processing of the fiber grating sensor lead: and (3) carrying out post-processing on the optical fiber outgoing lines 20 at the sections of the two ends of the cut composite material plate, stripping the carbon fiber bundles 18 around the cut optical fibers by using a wire stripper, reserving the complete bare optical fiber outgoing lines, and welding the bare optical fiber outgoing lines with an FC/APC jumper 19 to complete the implantation and continuous manufacturing of the fiber grating sensor in the pultruded composite material plate.

Claims

1. a continuous manufacturing process of a pultruded composite material sheet with a built-in FBG sensor, is characterized in that, comprises the following steps:

Step 1, fiber grating pretreatment: according to the processing and manufacturing needs of the pultruded composite material sheet, a plurality of grating grid regions (17) are pre-engraved on the continuous optical fiber, and the continuous optical fiber ( 11) Immerse in the surface modifier for surface treatment and heat drying. After the surface modifier is completely dried, according to the specified length of each pultruded composite material sheet, a plurality of grating grid regions (117 The predetermined cutting position of the continuous optical fiber (11) of ) is uniformly coated with a self-lubricating coating;

Step 2, carbon fiber sheet pultrusion: the rolled carbon fiber material (6) is drawn out from the fiber creel (7), passes through the fiber guide device (8) and the resin impregnation device (9) in sequence, and the resin-impregnated carbon fiber material passes through the fiber guide device (8) and the resin impregnation device (9). The optical fiber conveying device (13) passes through the fiber bundle plate (10); the continuous optical fiber (11) engraved with a plurality of grating grid regions is led out from the optical fiber hub (12), and passes through the optical fiber transmitter (13), from the fiber The bundling plate (10) passes through a guide hole at a predetermined position, so that the continuous optical fiber (11) engraved with a plurality of grating grating regions is evenly surrounded by the resin-impregnated carbon fiber material; the resin-impregnated carbon fiber material is engraved with a plurality of gratings. After the continuous optical fibers (11) in the grid region pass through the fiber bundle plate (10), they enter the thermoforming mold (14) together for curing and forming, and the formed composite material sheet is continuously transported to the sheet pulling device (15);

Step 3, cutting of the formed composite material sheet: after the composite material sheet is conveyed by the sheet pulling device (15) to the predetermined cutting position of the optical fiber, the composite material sheet is cut, and the composite material sheet is cut by a two-stage cutting device (16). Cutting of the sheet:

First, perform transverse cutting, and control the cutter to cut from the edge of the composite material sheet to the part where the fiber grating is implanted, so that the part where the optical fiber is implanted in the middle of the composite material sheet remains continuous; after the transverse cutting of the composite material sheet is completed, continue Use longitudinal cutting tool for secondary cutting;

Step 4, post-processing of the FBG sensor leads: post-processing the optical fiber lead wires (20) at the cross-sections at both ends of the composite material sheet after the cutting is completed, and stripping the carbon fiber bundles (18) around the optical fibers after cutting with a wire stripper, After retaining the intact bare fiber lead-out wire and splicing with the FC/APC jumper (19), the implantation and continuous manufacturing of the FBG sensor in the pultruded composite material sheet are completed.

2 . The continuous manufacturing process of a pultruded composite material sheet with built-in FBG sensor according to claim 1 , wherein in the step 1, the center wavelength of the grating grid region differs by 10-15 nm. 3 .

3. The continuous manufacturing process of a pultruded composite material sheet with a built-in FBG sensor according to claim 1, wherein the surface modifier in the step 1 is a coupling agent, a silica sol or both The blending compound solution, the surface modifier is dissolved in an organic solvent before the continuous optical fiber (11) engraved with a plurality of grating grid regions is immersed.

4 . The continuous manufacturing process of a pultruded composite material sheet with a built-in FBG sensor according to claim 1 , wherein the predetermined cutting position in the step 1 is a continuous line engraved with a plurality of grating grid regions. 5 . When the length of the optical fiber (11) reaches the predetermined length of the composite material sheet, the predetermined cutting position on the continuous optical fiber (11) engraved with a plurality of grating grid regions is marked.

5. The continuous manufacturing process of a pultruded composite material sheet with a built-in FBG sensor according to claim 1, wherein the self-lubricating coating in the step 1 is polytetrafluoroethylene or ultra-high molecular weight polyethylene , the thickness of the self-lubricating coating is 0.2-0.4 mm, and the length is 1-1.5 m.

6 . The continuous manufacturing process of a pultruded composite material sheet with an implanted FBG sensor according to claim 1 , wherein in the step 2, the predetermined position of the fiber bundle plate is implanted according to the need to implant the FBG sensor in the composite material sheet. 7 . The number of fiber gratings is determined, the implanted fiber gratings are symmetrically distributed along the center of the fiber bundle plate, and the distance between adjacent fiber gratings is not less than 10mm.

7. The continuous manufacturing process of a pultruded composite material sheet with a built-in FBG sensor according to claim 1, wherein the two-stage cutting device (16) in the step 3 comprises: a device fixing frame (1 ), a lifting device (2), a longitudinal slide rail (3), a transverse cutting system (4), and a longitudinal cutting system (5); the device fixing frame (1) is used to fix the cutting device and transport the formed composite material; the lifting device (2) is connected under the top surface of the device fixing frame (1), and is used to control the feeding of the tool assembly in the vertical direction; the longitudinal slide rail (3) is connected under the lifting device (2) , used to drive the cutter assembly to move in the front-rear direction and feed cutting; the transverse cutting system (4) is connected to the longitudinal slide rail (3), and is used for transverse cutting of the pultruded composite material perpendicular to the pulling direction ; The longitudinal cutting system (5) is connected to the longitudinal slide rail (3) and placed behind the transverse cutting system (4), for the pultrusion composite material after transverse cutting, along the traction direction Crop lengthwise.

8 . The continuous manufacturing process of a pultruded composite material sheet with built-in FBG sensor according to claim 7 , wherein the device fixing frame ( 1 ) comprises a fixing base ( 101 ), a frame column ( 102 ) ) and an upper cover plate (103), the fixed base (101) is provided with a material conveying groove (104), and a material conveying guide roller (105) is arranged inside the material conveying groove; the lifting device (2) drives the The method is electric drive, including two groups of front and rear liftable uprights (201), the two groups of liftable uprights (201) are raised and lowered synchronously during operation, and a lowering limit device (202) is provided.

9 . The continuous manufacturing process of a pultruded composite material sheet with built-in FBG sensor according to claim 7 , wherein the transverse cutting system ( 4 ) comprises a first-level transverse guide rail ( 401 ), a first-level transverse guide rail ( 401 ), a first-level transverse guide rail ( 401 ), A limiting device (402), a transverse outrigger (403), a transverse cutting wheel (404) and a drive motor (405); the first-level transverse guide rail (401) is connected to the lower part of the longitudinal slide rail (3), and the The first-level limiting device (402) is placed under the first-level transverse guide rail (401), and can move toward the center along the edges of both ends of the first-level transverse guide rail (401). The first-level limiting device (402) limits the two transverse cutting wheels The minimum distance between (404) is 2mm, the lateral outrigger (403) and the primary limiting device (402) are connected by a lateral shaft (406), and the lateral arm (403) can rotate around the lateral shaft (406) , the transverse cutting wheel (404) and the driving motor (405) are respectively installed on the front and rear sides of the transverse outrigger (403), and the driving motor (405) drives the transverse cutting wheel (404) during the cutting process Rotation, the direction of the installation of the blade edge of the transverse cutting blade wheel (404) is perpendicular to the conveying direction of the composite material, and the thickness of the blade edge of the transverse cutting blade wheel (404) is 0.6-0.8 mm;

The longitudinal cutting system (5) includes a secondary transverse guide rail (501), a secondary limiting device (502), a longitudinal extension arm (503), a longitudinal cutting wheel (504) and a drive motor (505); The secondary lateral guide rail (501) is connected to the lower part of the longitudinal slide rail (3), and the left and right secondary limiting devices (502) are placed on the secondary lateral guide rail (501) for adjusting the two longitudinal cuts The distance between the cutter wheels (504), the secondary limit device (502) limits the minimum distance between the two longitudinal cutting cutter wheels (504) to 2mm, the longitudinal outrigger (503) and the secondary limit device (502) ) are connected by a longitudinal axis (506), the longitudinal outrigger (503) can rotate around the longitudinal axis (506), and the longitudinal cutting wheel (504) and the drive motor (505) are respectively installed on the On both sides, the drive motor (505) drives the longitudinal cutting wheel (504) to rotate during the cutting process, and the longitudinal cutting wheel (504) is installed with the blade in a direction parallel to the direction of conveying the composite material. The longitudinal cutting wheel (504) ) of the edge thickness of 0.6 ~ 0.8mm.

10 . The continuous manufacturing process of a pultruded composite material sheet with a built-in FBG sensor according to claim 1 , wherein the transverse cutting in the step 3 is to stop cutting at a position of 2-3 mm near the optical fiber lead. 11 . .