Surface defect on-line detection device for pultrusion FRP (Fiber Reinforced Plastic) profile

Abstract

The invention relates to the technical field of outer surface defect detection devices, in particular to a pultrusion FRP profile surface defect online detection device which comprises a supporting leg, a detection cylinder is fixedly mounted at the upper end of the supporting leg, a shielding cylinder is fixedly mounted at the inner end of the detection cylinder, and a plurality of laser scanning detection devices are fixedly mounted at the inner end of the shielding cylinder. According to the device, discharged magnetic powder can be uniformly distributed and tightly attached to the outer surface of the FRP profile under the action of a guide angle, and the magnetic powder can be uniformly distributed and tightly attached to the outer surface of the FRP profile by means of the selective attachment characteristic of the magnetic powder, so that the magnetic powder can be uniformly distributed and tightly attached to the outer surface of the FRP profile; the laser scanning detection device can distinguish a defect area from a normal surface more clearly, so that the sensitivity and accuracy of defect detection are effectively improved, the phenomena of false detection and missing detection are reduced, and efficient identification of the surface defects of the FRP profile is realized.

Description

Technical Field

[0001] This invention relates to the field of surface defect detection devices, specifically to an online surface defect detection device for pultruded FRP profiles. Background Technology

[0002] Pultrusion is an important manufacturing method for the continuous production of high-performance fiber-reinforced composite (FRP) profiles. This process involves impregnating reinforcing fibers with resin and continuously pultruding them through a heated die to cure the composite material. It has advantages such as high production efficiency, precise profile cross-section, and excellent mechanical properties, and is therefore widely used in fields such as construction, transportation, aerospace, power, and chemical industry.

[0003] A search revealed that prior art publication number CN207571053U discloses a device for detecting surface defects in plastic pipes. This device includes a housing with a display panel on one side. The housing has a large circular hole on both the front and back, and a detachable silicone plate is mounted on each hole. The detachable silicone plate has a central hole for passing through and securing the plastic pipe. A light source is installed inside the housing, and an encoder bracket is fixed inside, mounting an encoder. At least one imaging device with a camera is also fixed inside the housing. This solution employs a closed structure, using a special light source and matching imaging equipment, effectively avoiding interference from external factors, resulting in clearer imaging and more accurate data.

[0004] Therefore, based on the above search and combined with existing technologies, in the existing FRP profile surface defect detection process, conventional methods mostly rely on optical imaging to directly detect the surface condition. Due to the complex surface texture, color difference and light interference of FRP profiles, the detection device often has difficulty in accurately identifying small defects such as cracks and pores, which easily leads to false detection or missed detection, resulting in insufficient detection sensitivity and reliability. To this end, this application proposes an online surface defect detection device for pultruded FRP profiles. Summary of the Invention

[0005] The purpose of this invention is to provide an online detection device for surface defects of pultruded FRP profiles to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an online surface defect detection device for pultruded FRP profiles, comprising a support leg, a detection cylinder fixedly installed at the upper end of the support leg, a shielding cylinder fixedly installed at the inner end of the detection cylinder, and multiple laser scanning detection devices fixedly installed at the inner end of the shielding cylinder for detecting defects on the outer surface of the FRP profile. The laser scanning detection devices are arranged in a ring. The shielding cylinder is used to shield the ambient light to prevent ambient light from interfering with the operation of the laser scanning detection devices and to ensure detection accuracy. A tail cap is fixedly connected to the left end of the detection cylinder, and a central tube is fixedly connected to the outer surface of the tail cap. The central tube is located inside the shielding cylinder. A protective cover is fixedly installed inside the detection cylinder, and a coating device is installed inside the protective cover to assist the laser scanning detection device in improving detection efficiency. A guide ring is fixedly installed at the inner right end of the detection cylinder.

[0007] As a further embodiment of the present invention, a contact ring is fitted on the outer wall of the central tube. When the FRP profile is inserted into the shielding cylinder, its end contacts the outer surface of the contact ring and pushes the contact ring to move towards the tail cover. A corrugated pipe is inserted through the inner end of the central tube, and the end of the corrugated pipe is fixedly connected to the outer surface of the tail cover. A rectangular sliding hole is opened on the outer surface of the central tube. An extension block is fixedly installed at the end of the corrugated pipe away from the tail cover. After the extension block passes through the rectangular sliding hole, it is fixedly connected to the outer surface of the contact ring.

[0008] As a further embodiment of the present invention, the coating device includes a converging sleeve, which is fixedly installed inside the protective cover. The outer surface of the shielding cylinder is provided with multiple push plates, which are arranged in a ring shape. Two adjacent push plates are fixedly connected to each other. A feeding sleeve is fixedly connected to one end of the shielding cylinder away from the tail cover.

[0009] As a further embodiment of the present invention, a storage cylinder is fitted on the outer surface of the feeding sleeve, and the inside of the storage cylinder is filled with magnetic powder. The converging sleeve is fixedly connected to the right end of the feeding sleeve, forming a cavity between them. Multiple guide tubes are fixedly connected to the outer surface of the storage cylinder. The guide tubes are arranged in a ring and are fixedly connected to the feeding sleeve. By setting a storage cylinder outside the feeding sleeve and filling it with magnetic powder, combined with the cavity formed between the converging sleeve and the feeding sleeve and the ring-shaped guide tube structure, the magnetic powder can be uniformly and stably delivered to the surface of the FRP profile, thereby ensuring the continuity and reliability of defect detection.

[0010] As a further embodiment of the present invention, the outer surface of the feeding sleeve is provided with multiple discharge holes, which are connected to the guide tube. The outer surface of the storage cylinder is provided with multiple rectangular perforations, and the push plate is inserted inside the rectangular perforations. When the push plate moves toward the feeding sleeve, it can push the magnetic powder inside the storage cylinder into the cavity between the converging sleeve and the feeding sleeve. By setting rectangular perforations on the outer surface of the storage cylinder and inserting the push plate therein, when the push plate moves, it can evenly push the magnetic powder in the storage cylinder into the cavity between the converging sleeve and the feeding sleeve, making the magnetic powder conveying smoother and more stable, avoiding accumulation or blockage, thereby improving the reliability of defect detection.

[0011] As a further embodiment of the present invention, a rotating ring is fitted on the outer surface of the storage cylinder, and a plurality of recycling boxes are mounted on the outer surface of the rotating ring for collecting spilled magnetic powder. The recycling boxes are arranged in a ring shape, and a return pipe is fixedly connected to the bottom end of the recycling box. A recycling hole is opened above the outer surface of the storage cylinder. When the rotating ring rotates, it drives the recycling box to move above the storage cylinder, and the return pipe aligns with the recycling hole.

[0012] As a further embodiment of the present invention, an auxiliary push rod is provided inside the recycling box. The auxiliary push rod is located above the return pipe and is connected to the recycling box by a reset spring. The outer surface of the recycling box is in contact with the inner wall of the protective cover. By providing an auxiliary push rod with a reset spring inside the recycling box, the magnetic powder can be effectively pushed and released during the recycling process, avoiding accumulation. At the same time, the contact between the outer surface of the recycling box and the inner wall of the protective cover can play a limiting and guiding role, thereby ensuring the stability and reliability of magnetic powder recycling.

[0013] As a further embodiment of the present invention, a pushing block is fixedly installed at the inner end of the protective cover, and the pushing block is parallel to the recycling hole on the outer surface of the storage cylinder. A sliding hole is opened on the outer surface of the recycling box, and a paddle is fixedly connected to the outer surface of the auxiliary push rod, with the paddle passing through the inside of the sliding hole. By setting a pushing block at the inner end of the protective cover, and cooperating with the sliding hole on the outer surface of the recycling box and the paddle structure on the auxiliary push rod, the auxiliary push rod can be effectively driven, so that the magnetic powder can smoothly enter the recycling box, thereby improving the efficiency and reliability of magnetic powder recycling.

[0014] As a further embodiment of the present invention, a plurality of electromagnets are fixedly installed at the inner end of the protective cover, the electromagnets being arranged in a ring. A scraper ring is fixedly installed at the inner end of the protective cover, and a guide groove is provided at the bottom inner side of the protective cover, so that the magnetic powder will flow directly through the guide groove to the rotation trajectory of the recycling box after falling. Subsequently, the recycling box will collect the magnetic powder at this location when it rotates. By setting the ring-arranged electromagnets and scraper ring structure at the inner end of the protective cover, residual magnetic powder on the surface of the FRP profile can be effectively removed, and the magnetic powder can be smoothly flowed into the rotation trajectory position of the recycling box under the action of the guide groove, realizing the automatic collection and recycling of magnetic powder, ensuring a clean testing environment and reducing resource waste.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This invention provides an auxiliary pusher at the end of the pusher plate, which allows the pusher plate to apply a uniform pushing force to the magnetic powder in the storage cylinder during movement, avoiding magnetic powder accumulation or poor flow. This ensures that the magnetic powder can be smoothly discharged through the guide tube, and the discharged magnetic powder can be evenly distributed and closely adhered to the outer surface of the FRP profile under the action of the guide angle. With the selective adhesion characteristics of the magnetic powder, the laser scanning detection device can more clearly distinguish between defect areas and normal surfaces, thereby effectively improving the sensitivity and accuracy of defect detection, reducing false detections and missed detections, and achieving efficient identification of surface defects of FRP profiles.

[0017] 2. In the process of extracting FRP profiles, the silicone scraper ring 306, with its inner diameter smaller than the outer diameter of the FRP profile, can effectively scrape off the magnetic powder remaining on its surface. After the electromagnet 307 inside the protective cover 304 is de-energized, the scraped magnetic powder falls to the bottom of the protective cover under the action of gravity and flows into the rotation trajectory area of ​​the recycling box 406 under the guidance of the guide groove 309. As the recycling box rotates, the magnetic powder is collected and recycled in a concentrated manner. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the detection device.

[0019] Figure 2 This is a schematic diagram of the internal structure of the detection cylinder;

[0020] Figure 3 This is a schematic diagram of the internal structure of the central tube;

[0021] Figure 4 This is a schematic diagram of the internal structure of the protective shield;

[0022] Figure 5 This is a schematic diagram of the internal structure of the converging sleeve and protective cover;

[0023] Figure 6 This is a schematic diagram of the internal structure of the storage cylinder;

[0024] Figure 7 This is a disassembled diagram of the inside of the recycling box;

[0025] Figure 8 This is a partial disassembly diagram of the sealing plate and rotating ring;

[0026] Figure 9 This is a disassembled diagram of the inside of the feed cylinder;

[0027] Figure 10 This is a disassembled diagram of the push block's internal structure.

[0028] Figure 11 This diagram illustrates the relationship between the pusher column and the discharge hole.

[0029] In the diagram: 1. Support leg; 2. Feed cylinder; 3. Detection cylinder; 4. Tail cap;

[0030] 101. Electric actuator; 102. Push block; 103. Balance bar; 104. Passive rod; 105. Conical block; 106. Extrusion block;

[0031] 201. Air pump; 202. Central tube; 203. Guide ring; 204. Bellows; 205. Contact ring; 206. Laser scanning detection device;

[0032] 301. Shielding cylinder; 302. Pressurizing cylinder; 303. Push plate; 304. Protective cover; 305. High-pressure pipe; 306. Scraper ring; 307. Electromagnet; 308. Push block; 309. Guide groove; 310. Auxiliary push column;

[0033] 401. Converging sleeve; 402. Rotating ring; 403. Sealing plate; 404. Storage cylinder; 405. Feeding sleeve; 406. Recycling box; 407. Recycling hole; 408. Guide tube; 409. Discharge hole; 410. Paddle; 411. Inlet; 412. Return pipe; 413. Reset spring; 414. Drive wheel; 415. Auxiliary push rod. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1: Please refer to Figure 1 , Figure 2An online surface defect detection device for pultruded FRP profiles includes a support leg 1. A detection cylinder 3 is fixedly installed on the upper end of the support leg 1 by a clamp. A shielding cylinder 301 is fixedly installed on the inner end of the detection cylinder 3 by bolts. Multiple laser scanning detection devices 206 are fixedly installed on the inner end of the shielding cylinder 301 for detecting defects on the outer surface of the FRP profile. The laser scanning detection devices 206 are arranged in a ring to achieve scanning of the outer surface of the FRP profile without blind spots. The laser scanning detection devices 206 use an internal laser to emit a laser beam of a certain wavelength. After being focused by an optical lens, a beam of light (line laser) or a light spot is formed and irradiates the surface of the FRP profile. When the surface of the FRP profile is flat and smooth, the reflected / scattered light band formed by the laser on the surface is regular and continuous. If defects appear on the outer surface, the light band will deform, break or change in brightness, thereby realizing the detection of the outer surface of the FRP material. The specific structure and working principle will not be described in detail here.

[0036] The shielding cylinder 301 is used to shield the surrounding ambient light and prevent ambient light from interfering with the operation of the laser scanning detection device 206, thus ensuring detection accuracy. The left end of the detection cylinder 3 is fixedly connected to the tail cap 4 by bolts, and the outer surface of the tail cap 4 is fixedly welded with a central tube 202, which is located inside the shielding cylinder 301. The inner side of the detection cylinder 3 is fixedly installed with a protective cover 304 by bolts, and the protective cover 304 is equipped with a coating device to assist the laser scanning detection device 206 in improving detection efficiency. The inner right end of the detection cylinder 3 is fixedly installed with a guide ring 203.

[0037] Specifically, the guide ring 203 is trumpet-shaped, and its inner diameter is the same as the outer diameter of the FRP profile to be tested. The trumpet-shaped guide ring 203 can better guide the FRP profile to be inserted into the shielding cylinder 301, while the protective cover 304 is located on the left side of the guide ring 203.

[0038] like Figure 2 , Figure 3 As shown, a contact ring 205 is fitted on the outer wall of the central tube 202. When the FRP profile is inserted into the shielding cylinder 301, its end contacts the outer surface of the contact ring 205 and pushes the contact ring 205 to move towards the tail cover 4. A bellows 204 is inserted through the inner end of the central tube 202, and the end of the bellows 204 is fixedly connected to the outer surface of the tail cover 4. A rectangular sliding hole is opened on the outer surface of the central tube 202. An extension block (not shown in the figure) is fixedly installed at the end of the bellows 204 away from the tail cover 4. After the extension block passes through the rectangular sliding hole, it is fixedly welded to the outer surface of the contact ring 205. When the contact ring 205 moves towards the tail cover 4, it squeezes the bellows 204, causing it to compress.

[0039] Specifically, an air pump 201 is fixedly installed on the inner end of the tail cover 4 by bolts, and the output end of the air pump 201 is connected to the bellows 204. When the air pump 201 is working, it applies pressure to the inside of the bellows 204. The increased pressure pushes the contact ring 205 to move, thereby pushing out the FRP profile that has been tested inside the shielding cylinder 301.

[0040] Example 2: Please refer to Figure 4 - Figure 6 , Figure 11 An online surface defect detection device for pultruded FRP profiles, based on Embodiment 1, includes a coating device comprising a converging sleeve 401, which is fixedly installed inside a protective cover 304 by bolts. The outer surface of the shielding cylinder 301 is provided with multiple push plates 303, which are arranged in a ring. Two adjacent push plates 303 are fixedly connected to each other. Pressure cylinders 302 are fixedly connected to the upper and lower sides of the shielding cylinder 301 by clamps. The output end of each pressure cylinder 302 is fixedly connected to the corresponding push plate 303, and the input end of each pressure cylinder 302 is fixedly connected to a high-pressure pipe 305. The input end of the high-pressure pipe 305 is connected to an external hydraulic device. The external hydraulic device is an existing mature device, which will not be described in detail here.

[0041] The shielding cylinder 301 is fixedly connected to the end away from the tail cover 4 with a feeding sleeve 405, and the outer surface of the feeding sleeve 405 is fitted with a storage cylinder 404. The storage cylinder 404 is filled with magnetic powder. The converging sleeve 401 is fixedly connected to the right end of the feeding sleeve 405, forming a cavity between them. Multiple guide tubes 408 are fixedly connected to the outer surface of the storage cylinder 404. The guide tubes 408 are arranged in a ring shape and are fixedly connected to the feeding sleeve 405. A sealing plate 403 is fixedly installed on the left end of the protective cover 304.

[0042] The outer surface of the feeding sleeve 405 is provided with multiple discharge holes 409, which are connected to the guide tube 408. The outer surface of the storage cylinder 404 is provided with multiple rectangular through holes, and the push plate 303 is inserted inside the rectangular through holes. When the push plate 303 moves toward the feeding sleeve 405, it will push the magnetic powder inside the storage cylinder 404 into the cavity between the converging sleeve 401 and the feeding sleeve 405.

[0043] To ensure a smoother flow of magnetic powder as the pusher plate 303 moves and compresses the material inside the storage cylinder 404, multiple auxiliary pusher columns 310 are fixedly installed at the ends of the pusher plate 303 (e.g., ...). Figure 11 As shown), the auxiliary pusher 310 corresponds to each guide tube 408. The inner diameter of the feeding sleeve 405 and the converging sleeve 401 is smaller than the outer diameter of the FRP profile to be tested, and the converging sleeve 401 has a guide angle inside (such as...). Figure 5As shown, after the magnetic powder is discharged from the discharge hole 409, it is guided to the outer surface of the FRP profile by the guide angle inside the converging sleeve 401. If there are defects on the surface of the FRP profile, the magnetic powder will be embedded in the defect, which is convenient for the laser scanning detection device 206 to identify. If there are no defects on the surface, the magnetic powder cannot adhere.

[0044] like Figure 5 - Figure 8 As shown, a rotating ring 402 is fitted on the outer surface of the storage cylinder 404. Two limiting rings (not shown in the figure) are fixedly installed on the outer surface of the storage cylinder 404. The rotating ring 402 is located between the two limiting rings. Multiple recycling boxes 406 are installed on the outer surface of the rotating ring 402 for collecting spilled magnetic powder. The recycling boxes 406 are arranged in a ring shape. A return pipe 412 is fixedly connected to the bottom end of the recycling box 406. A recycling hole 407 is opened above the outer surface of the storage cylinder 404. During the rotation of the rotating ring 402, the recycling box 406 is moved to the top of the storage cylinder 404, and the return pipe 412 corresponds to the recycling hole 407.

[0045] An auxiliary push rod 415 is installed inside the recycling box 406. The auxiliary push rod 415 is located above the return pipe 412, and the auxiliary push rod 415 is connected to the recycling box 406 by a return spring 413. Specifically, the outer surface of the recycling box 406 is arc-shaped, and an inlet 411 is provided in the direction of rotation of the recycling box 406. The outer surface of the recycling box 406 is in contact with the inner wall of the protective cover 304. A push block 308 is fixedly installed at the inner end of the protective cover 304. The push block 308 is triangular and parallel to the recycling hole 407 on the outer surface of the storage cylinder 404. A sliding door is provided on the outer surface of the recycling box 406. A paddle 410 is fixedly welded to the outer surface of the auxiliary push rod 415, and the paddle 410 passes through the inside of the sliding hole. Whenever the return pipe 412 is about to correspond with the recycling hole 407, the outer surface of the paddle 410 will contact the outer surface of the push block 308. As the recycling box 406 continues to move, the paddle 410 will be squeezed by the push block 308, causing the auxiliary push rod 415 to move towards the return pipe 412, which is used to assist in pushing the magnetic powder into the storage cylinder 404. It is worth noting that when the push plate 303 moves, it first passes through the recycling hole 407, which can prevent the magnetic powder from being ejected from the hole during the extrusion of the magnetic powder.

[0046] A drive wheel 414 is rotatably mounted on the outer surface of the recycling box 406. The outer surface of the drive wheel 414 contacts the outer surface of the storage cylinder 404, and a hub motor is fixedly mounted on the inner end of the drive wheel 414. The hub motor drives the drive wheel 414 to rotate, thereby driving the recycling box 406 to rotate.

[0047] like Figure 5 , Figure 8As shown, multiple electromagnets 307 are fixedly installed on the inner end of the protective cover 304 and the outer surface of the central tube 202. The electromagnets 307 are arranged in a ring. Specifically, after the magnetic powder adheres to the outer surface of the defective FRP profile, it will enter the interior of the shielding cylinder 301. Under the magnetic force of the electromagnets 307 on the outer surface of the central tube 202, the magnetic powder can be stably adsorbed on the outer surface of the FRP profile, so that the laser scanning detection device 206 can better scan the defects on the outer surface of the FRP profile. After the FRP profile leaves the interior of the shielding cylinder 301, the magnetic powder on the outer surface of the FRP profile will be attracted out by the magnetic force of the electromagnets 307 inside the protective cover 304. It is worth noting that the end of the central tube 202 extends parallel to the interior of the converging sleeve 401, so that the extruded magnetic powder can be directly within the magnetic field range of the electromagnets 307 after being discharged, and thus be stably adsorbed on the outer surface of the FRP profile.

[0048] Because the overall surface of FRP profiles is relatively smooth, the magnetic powder on non-defect areas is relatively thin and not easy to stay stably. However, in defects such as cracks and depressions, the magnetic powder is more likely to accumulate and form obvious accumulation. Therefore, it will not affect the accurate identification of defect areas by the laser scanning detection device 206.

[0049] A scraper ring 306 is fixedly installed at the inner end of the protective cover 304. The scraper ring 306 is made of silicone and its inner diameter is smaller than the outer diameter of the FRP profile. When the FRP profile is pulled out, the scraper ring 306 will scrape off the magnetic powder remaining on the outer surface of the FRP profile. Then, the electromagnet 307 inside the protective cover 304 is de-energized, and the magnetic powder inside the protective cover 304 falls to its bottom under the action of gravity. A guide groove 309 is opened at the bottom inner side of the protective cover 304, so that the magnetic powder will flow directly through the guide groove 309 to the rotation trajectory of the recycling box 406 after falling. Then, the recycling box 406 will collect the magnetic powder at this location when it rotates.

[0050] like Figure 9 , Figure 10As shown, a feed cylinder 2 is fixedly installed on the upper end of the support leg 1 by a clamp. An electric actuator 101 is fixedly installed on the inner end of the feed cylinder 2 by bolts, and a passive rod 104 is fixedly connected to the telescopic end of the electric actuator 101. A push block 102 is provided inside the feed cylinder 2, and the passive rod 104 passes through the inside of the push block 102. Two balance rods 103 are fixedly installed on the upper end of the feed cylinder 2. The outer surface of the push block 102 is sleeved on the outer surface of the two balance rods 103. Two perforations are opened on the outer surface of 02, and extrusion blocks 106 are inserted inside the two perforations. A conical block 105 is fixedly connected to the end of the passive rod 104, and the conical block 105 is located on the left side of the two extrusion blocks 106. When the conical block 105 moves to the right, its outer surface contacts the extrusion block 106 and pushes the extrusion block 106 to move to both sides. If the push block 102 is located inside the FRP profile, the extrusion block 106 can be moved to both sides to achieve the clamping of the FRP profile.

[0051] The working principle of this invention is:

[0052] In use, the FRP profile is placed inside the feed cylinder 2, and then the electric push rod 101 is activated. The telescopic end then pushes the push block 102 through the passive rod 104 to push the FRP profile into the feed cylinder 2 (the electric push rod 101 has a built-in stroke detection, which can determine the current distance in real time. This is a mature technology and will not be described in detail here). When the FRP profile is pushed to the loading sleeve 405, the pressure cylinder 302 drives the push plate 303 to move towards the loading sleeve 405. When the push plate 303 moves, it first passes through the recovery hole 407, and then pushes the magnetic powder inside the storage cylinder 404 into the cavity between the converging sleeve 401 and the loading sleeve 405. After the magnetic powder is discharged from the discharge hole 409, it is guided to the outer surface of the FRP profile by the guide angle inside the converging sleeve 401. If there are defects on the surface of the FRP profile, the magnetic powder will preferentially enter the defect and accumulate under the action of extrusion and gravity, while it is difficult to maintain adhesion on a flat surface.

[0053] As the FRP profile enters the shielding cylinder 301, the bellows 204 is compressed. The laser scanning detection device 206 identifies defects on the outer surface of the FRP profile. After identification, the air pump 201 applies pressure to the inside of the bellows 204, causing the bellows 204 to extend and push the FRP profile out of the detection cylinder 3 through the contact ring 205.

[0054] When the electromagnet 307 inside the protective cover 304 is energized, it attracts the magnetic powder on the outer surface of the FRP profile. The scraper ring 306 then scrapes off the magnetic powder remaining on the outer surface of the FRP profile. After the FRP profile is completely removed, the electromagnet 307 inside the protective cover 304 is de-energized. The magnetic powder inside the protective cover 304 falls to the bottom under the action of gravity and is collected by the rotation of the recycling box 406.

[0055] After the FRP profile is removed from the feed cylinder 2, it will be fitted onto the outer surface of the push block 102. Then, the electric push rod 101 drives the passive rod 104 to move. At this time, when the conical block 105 moves to the right, its outer surface contacts the extrusion block 106 and pushes the extrusion block 106 to move to both sides. If the push block 102 is inside the FRP profile, the extrusion block 106 can clamp the FRP profile by moving to both sides. During the movement of the push block 102, the FRP profile is brought out from the inside of the feed cylinder 2.

[0056] If there are defects on the outer surface of the FRP profile, the staff will clean the residual magnetic powder at the defect site and then repair it according to the severity of the defect.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An online surface defect detection device for pultruded FRP profiles, comprising support legs (1), characterized in that: A detection cylinder (3) is fixedly installed on the upper end of the support leg (1). A shielding cylinder (301) is fixedly installed on the inner end of the detection cylinder (3). A plurality of laser scanning detection devices (206) are fixedly installed on the inner end of the shielding cylinder (301). The laser scanning detection devices (206) are arranged in a ring. The shielding cylinder (301) is used to shield the ambient light. A tail cap (4) is fixedly connected to the left end of the detection cylinder (3). A central tube (202) is fixedly connected to the outer surface of the tail cap (4). The central tube (202) is located inside the shielding cylinder (301). A protective cover (304) is fixedly installed on the inner side of the detection cylinder (3). A coating device is installed inside the protective cover (304). A guide ring (203) is fixedly installed on the inner right end of the detection cylinder (3).

2. The online surface defect detection device for pultruded FRP profiles according to claim 1, characterized in that: The outer wall of the central tube (202) is fitted with a contact ring (205). When the FRP profile is inserted into the shielding cylinder (301), its end contacts the outer surface of the contact ring (205) and pushes the contact ring (205) to move towards the tail cap (4). The inner end of the central tube (202) is provided with a corrugated tube (204), and the end of the corrugated tube (204) is fixedly connected to the outer surface of the tail cap (4). The outer surface of the central tube (202) is provided with a rectangular sliding hole. An extension block is fixedly installed at the end of the corrugated tube (204) away from the tail cap (4). After the extension block passes through the rectangular sliding hole, it is fixedly connected to the outer surface of the contact ring (205).

3. The online surface defect detection device for pultruded FRP profiles according to claim 1, characterized in that: The coating device includes a converging sleeve (401), which is fixedly installed inside the protective cover (304). The outer surface of the shielding cylinder (301) is provided with multiple push plates (303), which are arranged in a ring. Two adjacent push plates (303) are fixedly connected to each other. The end of the shielding cylinder (301) away from the tail cover (4) is fixedly connected with a feeding sleeve (405).

4. The online surface defect detection device for pultruded FRP profiles according to claim 3, characterized in that: The outer surface of the feeding sleeve (405) is fitted with a storage cylinder (404), the inside of which is filled with magnetic powder. The converging sleeve (401) is fixedly connected to the right end of the feeding sleeve (405), forming a cavity between them. A plurality of guide tubes (408) are fixedly connected to the outer surface of the storage cylinder (404). The guide tubes (408) are arranged in a ring shape and are fixedly connected to the feeding sleeve (405).

5. The online surface defect detection device for pultruded FRP profiles according to claim 4, characterized in that: The outer surface of the feeding sleeve (405) is provided with multiple discharge holes (409), which are connected to the guide tube (408). The outer surface of the storage cylinder (404) is provided with multiple rectangular perforations, and the push plate (303) is inserted inside the rectangular perforations. When the push plate (303) moves toward the feeding sleeve (405), the magnetic powder inside the storage cylinder (404) is pushed into the cavity between the converging sleeve (401) and the feeding sleeve (405).

6. The online surface defect detection device for pultruded FRP profiles according to claim 4, characterized in that: A rotating ring (402) is fitted on the outer surface of the storage cylinder (404). Multiple recycling boxes (406) are mounted on the outer surface of the rotating ring (402) for collecting spilled magnetic powder. The recycling boxes (406) are arranged in a ring shape. A return pipe (412) is fixedly connected to the bottom end of the recycling box (406). A recycling hole (407) is opened above the outer surface of the storage cylinder (404). When the rotating ring (402) rotates, it drives the recycling box (406) to move above the storage cylinder (404). Then, the return pipe (412) corresponds to the recycling hole (407).

7. The online surface defect detection device for pultruded FRP profiles according to claim 6, characterized in that: An auxiliary push rod (415) is installed inside the recycling box (406). The auxiliary push rod (415) is located above the return pipe (412), and the auxiliary push rod (415) is connected to the recycling box (406) by a return spring (413). The outer surface of the recycling box (406) is in contact with the inner wall of the protective cover (304).

8. The online surface defect detection device for pultruded FRP profiles according to claim 7, characterized in that: The inner end of the protective cover (304) is fixedly installed with a push block (308), and the push block (308) is parallel to the recycling hole (407) on the outer surface of the storage cylinder (404). The outer surface of the recycling box (406) is provided with a sliding hole. The outer surface of the auxiliary push rod (415) is fixedly connected with a paddle (410), and the paddle (410) passes through the inside of the sliding hole.

9. The online surface defect detection device for pultruded FRP profiles according to claim 8, characterized in that: Multiple electromagnets (307) are fixedly installed at the inner end of the protective cover (304). The electromagnets (307) are arranged in a ring. A scraper ring (306) is fixedly installed at the inner end of the protective cover (304). A guide groove (309) is provided at the bottom inner side of the protective cover (304), so that after the magnetic powder falls, it will flow directly through the guide groove (309) to the rotation trajectory of the recycling box (406). Then, when the recycling box (406) rotates, it will collect the magnetic powder at that location.

Images