Pre-impregnation roller press for thermoplastic composite fiber material and control system of pre-impregnation roller press

Abstract

The invention relates to the technical field of composite material preparation, in particular to a preimpregnation roller press for thermoplastic composite fiber materials, which comprises an unwinding rack, a drying oven and a rolling box which are linearly distributed, and guide wheels are mounted in the drying oven and the rolling box. A cloth-shaped composite fiber material arranged on the unwinding rack penetrates through the drying oven to enter the rolling box under the guiding and conveying effects of the guiding wheels, at least one set of spraying mechanism and one set of rolling mechanism are installed in the rolling box, and expanding mechanisms are installed at the positions, located on the two sides of each set of rolling mechanism, in the rolling box. The fiber cloth is stretched towards the two sides in the rolling process through the spreading mechanism, gaps between fibers are enlarged, more channels are provided for permeation of thermoplastic high polymer material liquid, the thermoplastic high polymer material liquid is made to fully permeate into the fiber cloth, the interface bonding force between the thermoplastic high polymer material liquid and the fibers is enhanced, and the mechanical property of the fiber cloth is improved. And the overall mechanical properties, such as strength, modulus and wear resistance, of the composite material are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material preparation, and particularly relates to a prepreg rolling machine for thermoplastic composite fiber materials and its control system. Background Art

[0002] Due to its excellent mechanical properties, corrosion resistance, and recyclability, thermoplastic composite fiber materials have been widely used in fields such as aerospace, automotive manufacturing, and construction. The prepreg process is a key step in the preparation of thermoplastic composite fiber materials. Its purpose is to uniformly combine the fiber material with the thermoplastic resin to form a prepreg for subsequent forming processing. Currently, the prepreg process mainly relies on prepreg rolling machines to uniformly coat the resin on the fiber surface by rolling and achieve the melting of the resin and the infiltration of the fiber under certain temperature and pressure.

[0003] In the prior art, for example, the patent with the publication number 200810201216.9 and the patent name "Continuous Fiber Reinforced Thermoplastic Resin Composite Prepreg Tape Preparation Equipment and Application" specifically discloses a technical solution of "a continuous fiber reinforced thermoplastic resin composite prepreg tape preparation equipment, which sequentially includes a yarn frame 10, a first tension adjustment device 20, an electrostatic elimination device 30, a preheating oven 40, a second tension adjustment device 50, a double extrusion die head 60, a three-roll impregnation device 70, a cooling roll pressing device 80, and a traction winding device 90. The feature is that the device uses an interleaved double extrusion die head 60 to pre-impregnate the continuous fiber tape". The above solution includes a yarn frame, a tension adjustment device, an electrostatic elimination device, a preheating oven, a tension adjustment device, a double extrusion die head, a three-roll impregnation device, a cooling and shaping roll, and a traction winding device. By using an interleaved double extrusion die head to pre-impregnate the continuous fiber tape, through special design of the process, a continuous fiber reinforced thermoplastic resin composite prepreg tape with uniform fiber dispersion and complete impregnation can be obtained. The manufacturing method of this continuous fiber reinforced thermoplastic resin composite prepreg tape has low cost, the resin content in the prepreg tape can be easily controlled, and it is ensured that the fibers in the manufactured continuous fiber reinforced thermoplastic resin composite prepreg tape are completely infiltrated and the porosity is not higher than 0.2%.

[0004] However, in the actual application process, when pre-impregnating and rolling a cloth-like thermoplastic composite fiber material, the cloth-like fiber material usually consists of fibers woven in warp and weft. The arrangement of the fibers is relatively tight, the surface voids are small, and at the same time, the surface of the fiber cloth is smooth, making it difficult for the resin to adhere and penetrate during the coating process, resulting in uneven resin distribution. In addition, the cloth-like thermoplastic composite fiber material is usually composed of multiple layers of fibers stacked together. The resin needs to penetrate into each layer of fibers to achieve uniform distribution. However, thermoplastic resin has a certain viscosity in the molten state. If the fluidity is insufficient, it is difficult to penetrate into the tiny voids of the fiber cloth, resulting in an unsatisfactory resin penetration effect and uneven resin distribution. Summary of the Invention

[0005] Technical Problems to be Solved

[0006] In view of the above-mentioned disadvantages of the prior art, the present invention provides a pre-impregnating rolling machine and its control system for thermoplastic composite fiber materials, which can solve the problem that the resin cannot fully penetrate into the tiny voids of the cloth-like thermoplastic composite fiber material during pre-impregnating and rolling in the prior art.

[0007] Technical Solutions

[0008] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0009] The present invention provides a pre-impregnating rolling machine and its control system for thermoplastic composite fiber materials, including a linearly distributed unwinding rack, an oven, and a rolling box. Guide wheels are installed in both the oven and the rolling box. The cloth-like composite fiber material arranged on the unwinding rack passes through the oven and enters the rolling box under the guiding and conveying action of the guide wheels. At least one set of spraying mechanism and one set of rolling mechanism are installed in the rolling box. Amplifying mechanisms are installed on both sides of each set of rolling mechanisms inside the rolling box.

[0010] A control box is provided on the side of the rolling box. A driving device and a transmission mechanism are installed inside the control box. The driving device drives the spraying mechanism, the rolling mechanism, and the amplifying mechanism to operate through the transmission mechanism. The spraying mechanism sprays the liquid of thermoplastic polymer material on both side surfaces of the cloth-like composite fiber material when it passes through. The rolling mechanism applies a rolling pressure on both side surfaces of the cloth-like composite fiber material when it passes through. The amplifying mechanism includes two sets of fixed frames installed in the upper and lower lines inside the rolling box. Pressure blocks are slidably installed in both sets of fixed frames. The two pressure blocks form a clamping tension on the cloth-like composite fiber material under the drive of the transmission mechanism, and the tension direction is away from the side of the rolling mechanism.

[0011] Furthermore, the rolling mechanism includes two sets of transmission shafts rotatably mounted on a mounting frame arranged inside the rolling box, the two sets of transmission shafts are distributed up and down, and rolling wheels are provided on the surfaces of the two sets of transmission shafts. The transmission mechanism is used to drive the two sets of rolling wheels to rotate.

[0012] Furthermore, the transmission mechanism includes a central shaft rotatably connected to the control box, the driving device is connected to the central shaft through a transmission member, and a driving gear is provided on the surface of the central shaft; the two groups of transmission shafts are provided with driven gears on one end surface located inside the control box, and the driving gear is meshed and connected with the two groups of driven gears at the same time.

[0013] Furthermore, a slide rail is provided on the surface of the fixed frame, a first slider is slidably installed inside the slide rail, the pressure block is installed on the first slider, a connecting rod is connected to the surface of the pressure block, one end of the connecting rod passes through a slide groove provided on the surface of the rolling box and is inserted into the control box, the slide groove and the slide rail are distributed in parallel, the outer ends of the two groups of connecting rods in the expansion mechanism are connected to push blocks, a second slider is provided on the surface of the push block, the second slider is sleeved on the surface of the fixed rod installed in the control box, the surface of the fixed rod is sleeved with a spring, and the surface of the control wheel is provided with at least two groups of circumferentially distributed protrusions.

[0014] Furthermore, a surface of the pressing block facing the cloth-like composite fiber material is arranged parallel to the cloth-like composite fiber material.

[0015] Furthermore, a tension adjusting wheel is installed on one side of each group of expansion mechanisms inside the rolling box, and the tension adjusting wheel is arranged on the outside of the expansion mechanism relative to the rolling mechanism. The upper end of the tension adjusting wheel is connected to a lifting slide rod, and a top block is slidably installed inside the control box, and the upper end of the top block is connected to the lifting slide rod.

[0016] Furthermore, the spray mechanism comprises two groups of spray pipes installed in the rolling box, the two groups of spray pipes are distributed up and down, and the opposite sides of the two groups of spray pipes are provided with spray heads that are evenly distributed and connected to the inside.

[0017] Furthermore, the outer ends of the two groups of spray pipes are extended to the outside of the rolling box and are provided with a connected solvent box.

[0018] Further, a tee is connected to the surface of the solvent tank and is in communication therewith. One end of the tee penetrates into the interior of the control box, and the other end of the tee faces outward. One-way valves are provided at both the end of the tee facing outward and the end connected to the solvent tank. A turntable is further connected to the surface of the central shaft. A connecting rod is rotatably mounted at a non-central position on the surface of the turntable. The other end of the connecting rod is rotatably connected to a piston rod, and the piston rod is U-shaped. Piston blocks are respectively provided at both ends of the piston rod and are inserted into two groups of tees.

[0019] A control system for a prepreg rolling machine for thermoplastic composite fiber materials, comprising a main control module, an unwinding control module, a drying control module, a spraying control module, a rolling control module, a width expanding control module, and a tension adjusting module; wherein:

[0020] The unwinding control module is used to control the unwinding speed and tension of the cloth-like composite fiber material by the unwinding rack;

[0021] The drying control module is used to control the heating temperature in the oven;

[0022] The spraying control module is used to control the spraying amount of the thermoplastic polymer material liquid;

[0023] The rolling control module is used to control the rotation speed and pressure of the rolling mechanism;

[0024] The width expanding control module is used to control the clamping and stretching degree of the width expanding mechanism;

[0025] The tension adjusting module is used to control the stretching tension of the cloth-like composite fiber material by the tension adjusting wheel.

[0026] Beneficial effects

[0027] The technical solution provided by the present invention has the following beneficial effects compared with the known public technologies:

[0028] First, the present invention sprays the thermoplastic polymer material liquid from both sides of the cloth-like composite fiber material through the spraying mechanism, and combines the pressure of the rolling mechanism to ensure that the thermoplastic polymer material liquid uniformly penetrates into the interior of the fiber cloth, reducing the problem of uneven distribution of the thermoplastic polymer material liquid.

[0029] Second, the present invention stretches the fiber cloth to both sides during the rolling process through the width expanding mechanism, increasing the gaps between the fibers, providing more channels for the penetration of the thermoplastic polymer material liquid, further improving the penetration effect of the thermoplastic polymer material liquid; enabling the thermoplastic polymer material liquid to fully penetrate into the interior of the fiber cloth, enhancing the interfacial bonding force between the thermoplastic polymer material liquid and the fibers, and improving the overall mechanical properties of the composite material, such as strength, modulus, and wear resistance.

[0030] III. Through the collaborative work of the unwind rack, oven, and rolling box with linear distribution, as well as multiple groups of rolling mechanisms and width expansion mechanisms, the present invention realizes continuous operation, reduces the pause time between processes, and improves production efficiency. The control system coordinates the operation of each sub-module through the main control module to ensure seamless connection between each process step, avoiding problems such as uneven distribution of thermoplastic polymer material liquid or material deformation caused by asynchrony. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 Isometric schematic diagram of the structure of the prepreg rolling machine in the embodiment of the present invention;

[0033] Figure 2 Cross-sectional schematic diagram of the overall structure in the embodiment of the present invention;

[0034] Figure 3 Internal structure schematic diagram of the prepreg rolling machine in the embodiment of the present invention;

[0035] Figure 4 Installation schematic diagram of the structure of the width expansion mechanism in the embodiment of the present invention;

[0036] Figure 5 Linkage schematic diagram of the structures of the rolling mechanism and the width expansion mechanism in the embodiment of the present invention;

[0037] Figure 6 Composition schematic diagram of the structure of the width expansion mechanism in the embodiment of the present invention;

[0038] Figure 7 Installation schematic diagram of the structure of the spraying mechanism in the embodiment of the present invention;

[0039] Figure 8 Cooperation schematic diagram of the rolling mechanism, width expansion mechanism, and tension adjusting wheel in the embodiment of the present invention.

[0040] The reference numerals in the figures respectively represent: 1. unwind rack; 2. oven; 3. rolling box; 301. control box; 302. driving device; 303. transmission member; 304. central shaft; 305. turntable; 306. connecting rod; 307. chute; 4. guide wheel; 5. spraying mechanism; 501. spraying pipe; 502. nozzle; 503. solvent tank; 504. three-way pipe; 505. check valve; 506. piston rod; 6. rolling mechanism; 601. transmission shaft; 602. rolling wheel; 603. driven gear; 604. driving gear; 7. width expanding mechanism; 701. fixing frame; 702. slide rail; 703. first slider; 704. pressing block; 705. connecting rod; 706. pushing block; 707. fixing rod; 708. spring; 709. second slider; 710. control wheel; 711. convex block; 8. tension adjusting wheel; 801. lifting slide bar; 802. top block. Detailed implementation manners

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0042] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to" and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0043] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above the top" and "on the top" of the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the bottom" and "under the bottom" of the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0044] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0045] The present invention will be further described below in conjunction with embodiments.

[0046] Embodiment 1:

[0047] Please refer to the attached Figure 1-8 , this solution proposes a prepreg rolling machine for thermoplastic composite fiber materials, which is used to infiltrate a thermoplastic polymer material liquid into a cloth-like composite fiber material by means of prepreg and rolling; to achieve a good bonding effect between the thermoplastic polymer material liquid and the composite fiber material, and to improve the tension, strength and wear resistance of the composite fiber material.

[0048] The polymer material liquid has reversible thermoplasticity, that is, when heated to a certain temperature, the polymer material liquid will melt and regain fluidity, and can be re-solidified after cooling. This characteristic enables thermoplastic composites to be recycled by heating, melting and re-forming, without undergoing irreversible chemical cross-linking like thermosetting polymer material liquids; therefore, the thermoplastic composite fiber materials produced in this way can be recycled, and during the recycling process, the composite fiber materials can usually maintain their structural integrity; thus having the advantages of resource conservation, environmental friendliness, economy, etc.

[0049] It mainly includes a unwind rack 1, an oven 2 and a rolling box 3 which are linearly arranged and installed in sequence; the cloth-like composite fiber material is wound on the unwind roller installed on the unwind rack 1, and at the same time, a power device is integrally installed on the unwind rack 1 to drive the unwind roller to rotate, thereby realizing the unwind operation of the cloth-like composite fiber material and ensuring that the cloth-like composite fiber material can be stably and evenly conveyed in the device.

[0050] The oven 2 is arranged between the unwind rack 1 and the rolling box 3. Guide wheels 4 are installed on both the oven 2 and the rolling box 3 to guide and adjust the conveying direction of the cloth-like composite fiber material, ensuring that the cloth-like composite fiber material maintains a stable and uniform path during the processing. After the cloth-like composite fiber material is unwound on the unwind rack 1, it is guided by the guide wheels 4 and conveyed into the oven 2 for heating to increase the fiber temperature.

[0051] It should be noted that hot fibers are more likely to combine with thermoplastic polymer material liquids because the thermoplastic polymer material liquids will soften or melt faster when in contact with hot fibers, thereby improving the wettability and distribution uniformity of the thermoplastic polymer material liquids; and when in contact, the thermoplastic polymer material liquids will quickly soften or partially melt, forming a tighter bond with the cloth-like composite fiber material.

[0052] After the cloth-like composite fiber material is pre-dried in the oven 2, it enters the inside of the rolling box 3 under the guiding and conveying of the guiding wheel 4.

[0053] At least one set of spraying mechanism 5 and one set of rolling mechanism 6 are installed inside the rolling box 3. On both sides of each set of rolling mechanism 6, a width expanding mechanism 7 is installed in a matching manner; the spraying mechanism 5 is located in front of the rolling mechanism 6. When the cloth-like composite fiber material enters the rolling box 3, it will enter the spraying mechanism 5 under the action of the guiding wheel 4. The operation of the spraying mechanism 5 can spray the thermoplastic polymer material liquid on the surface of the cloth-like composite fiber material; thus, when the cloth-like composite fiber material is conveyed into the rolling mechanism 6, the rolling mechanism 6 generates pressure on the surface of the spraying mechanism 5 during operation, further compressing the cloth-like composite fiber material and the thermoplastic polymer material liquid to ensure that the thermoplastic polymer material liquid is evenly distributed and completely infiltrates the inside of the cloth-like composite fiber material; and during the rolling process, the voids and bubbles in the cloth-like composite fiber material can also be eliminated, improving the density and mechanical properties of the composite material.

[0054] Specifically, a control box 301 is provided on the side of the rolling box 3. Inside the control box 301, a driving device 302 and a transmission mechanism are installed; the driving device 302 is used to drive the transmission mechanism to operate and drive the spraying mechanism 5, the rolling mechanism 6, and the width expanding mechanism 7 to operate synchronously. Thus, when the cloth-like composite fiber material is being conveyed, seamless connection between each process step can be ensured, avoiding problems such as uneven distribution of the thermoplastic polymer material liquid, deformation of the cloth-like composite fiber material, or insufficient rolling caused by asynchronous operation of each mechanism.

[0055] And the control box 301 is arranged on the outer side of the rolling box 3, which can significantly improve the convenience of equipment operation and maintenance.

[0056] Specifically, the spraying mechanism 5 includes two sets of spray pipes 501 installed inside the rolling box 3, and the two sets of spray pipes 501 are distributed vertically.

[0057] When the cloth-like composite fiber material enters the rolling box 3 under the guiding and conveying action of the guide wheel 4, it will first enter the two groups of spray mechanisms 5, pass through the two groups of spray pipes 501, and then be conveyed to the rolling mechanism 6; the two groups of spray pipes 501 are provided with uniformly distributed and internally connected nozzles 502 on the opposite sides, and the thermoplastic polymer material liquid in the spray pipe 501 can be sprayed out through the nozzles 502; and then when the cloth-like composite fiber material passes between the two groups of spray pipes 501, the thermoplastic polymer material liquid can be evenly sprayed on the two side surfaces of the cloth-like composite fiber material, so that the thermoplastic polymer material liquid can penetrate into the inside from both sides of the cloth-like composite fiber material at the same time, reducing the uneven distribution problem caused by unilateral penetration.

[0058] At the same time, the outer ends of the two groups of spray pipes 501 are both extended to the outside of the rolling box 3, and are equipped with a connected solvent box 503. By setting the solvent box 503 outside the rolling box 3, the thermoplastic polymer material liquid can be easily supplemented to improve the working efficiency of the equipment.

[0059] The rolling mechanism 6 includes two sets of transmission shafts 601, which are rotatably mounted on a mounting frame arranged inside the rolling box 3 and are distributed up and down; the surfaces of the two sets of transmission shafts 601 are provided with rolling wheels 602, and when the cloth-like composite fiber material completes the spraying of the thermoplastic polymer material liquid in the spray mechanism 5, it will enter between the two sets of rolling wheels 602 under the guidance of the guide wheel 4.

[0060] As a result, when the two sets of rolling wheels 602 are rotating, the rolling wheels 602 will come into contact with the surface of the cloth-like composite fiber material and roll the cloth-like composite fiber material at a certain pressure and speed. During the rolling process, the pressure of the rolling wheels 602 causes the thermoplastic polymer material liquid to flow on the surface of the cloth-like composite fiber material and further penetrate into the interior, thereby ensuring full combination between the thermoplastic polymer material liquid and the cloth-like composite fiber material.

[0061] The ends of the two transmission shafts 601 on the same side are both inserted into the control box 301, and the surfaces of the ends of the two transmission shafts 601 located inside the control box 301 are both provided with driven gears 603; the rolling box 3 also includes a central shaft 304 rotatably mounted between the two driven gears 603, and the surface of the central shaft 304 is provided with a driving gear 604, and the driving gear 604 is located between the two driven gears 603, and the driving gear 604 is simultaneously meshed and connected with the two driven gears 603. The driving device 302 is connected to the central shaft 304 through a transmission member 303 such as a sprocket and a chain, so that after the driving device 302 is turned on, the central shaft 304 can be driven to rotate, and the two driven gears 603 are simultaneously meshed and rotated through the driving gear 604, and finally the two rolling wheels 602 are synchronously driven to achieve the rolling operation of the cloth-like composite fiber material.

[0062] The rotation directions of the two sets of rolling wheels 602 are the same.

[0063] As Figure 6 shown, both sets of rolling wheels 602 rotate clockwise, and the conveying direction of the cloth-like composite fiber material is from left to right; enabling the two sets of rolling wheels 602 to evenly apply pressure on both sides of the cloth-like composite fiber material, effectively pressing the thermoplastic polymer material liquid into the gaps of the cloth-like composite fiber material and promoting the penetration of the thermoplastic polymer material liquid.

[0064] The difference is that two sets of fabric expanding mechanisms 7 are symmetrically installed on both sides of the rolling mechanism 6. When the rolling mechanism 6 rolls the cloth-like composite fiber material, the fabric expanding mechanisms 7 will simultaneously stretch the cloth-like composite fiber material to both sides with the rolling positions of the two sets of rolling wheels 602 as the center, increasing the distance between the fibers and also making the surface voids larger; this provides more channels for the penetration of the thermoplastic polymer material liquid, enabling the thermoplastic polymer material liquid to penetrate more evenly into the interior of the cloth-like composite fiber material, improving the distribution of the thermoplastic polymer material liquid, being able to better combine with the cloth-like composite fiber material, enhancing the interfacial bonding force between the cloth-like composite fiber material and the thermoplastic polymer material liquid, and improving the overall performance of the material.

[0065] Moreover, after the voids inside the cloth-like composite fiber material become larger, the thermoplastic polymer material liquid is more likely to flow and penetrate into the cloth-like composite fiber material during the rolling process, reducing the phenomenon of the thermoplastic polymer material liquid accumulating on the surface, thereby improving the uniformity and quality of the thermoplastic polymer material liquid.

[0066] The fabric expanding mechanism 7 includes two sets of fixed frames 701 installed inside the rolling box 3. The two sets of fixed frames 701 are distributed vertically, and the cloth-like composite fiber material will pass between the two sets of fixed frames 701 under the guiding and conveying of the guiding wheels 4.

[0067] The surface of the fixed frame 701 is provided with a slide rail 702, and a first slider 703 is slidably installed inside the slide rail 702 in a matching manner. The surface of the first slider 703 is connected with a pressing block 704.

[0068] When the cloth-like composite fiber material passes between the two sets of fixed frames 701 under the guiding and conveying of the guiding wheels 4, it will be located between the two sets of pressing blocks 704; and the surface of the pressing block 704 facing the cloth-like composite fiber material is parallel to the cloth-like composite fiber material. Furthermore, when the two sets of pressing blocks 704 clamp and stretch the cloth-like composite fiber material outward, a larger contact area can be provided, thereby enhancing the clamping force on the cloth-like composite fiber material and improving the effect of void expansion; also avoiding surface damage or destruction of the cloth-like composite fiber material caused by pressure concentration.

[0069] The surface of the briquetting block 704 is connected with a connecting rod 705. One end of the connecting rod 705 penetrates through a sliding groove 307 arranged on the surface of the rolling box 3 and is inserted into the control box 301. The sliding groove 307 and the sliding rail 702 are arranged in parallel and are both inclined, gradually approaching the surface of the cloth-like composite fiber material from the side close to the rolling mechanism 6 towards the far direction.

[0070] At the outer ends of the two groups of connecting rods 705 in the width expanding mechanism 7, there are push blocks 706 connected. The surface of the push block 706 is provided with a second slider 709, and the second slider 709 is sleeved on the surface of a fixed rod 707 installed in the control box 301. And a spring 708 is sleeved on the surface of the fixed rod 707. Under the elastic force of the spring 708, the push block 706 is always pushed towards the side of the rolling mechanism 6.

[0071] A control wheel 710 is connected to the surface of the central shaft 304, and at least two groups of convex blocks 711 distributed in a circular pattern are provided on the surface of the control wheel 710. The two groups of push blocks 706 in the two groups of width expanding mechanisms 7 on both sides of the rolling mechanism 6 are always pushed towards the side of the convex block 711 under the elastic force of the spring and are in contact with the surface of the convex block 711. When the driving device 302 drives the rolling mechanism 6 to operate, it will synchronously drive the central shaft 304 connected to the control wheel 710 to rotate, and then control the convex block 711 to rotate.

[0072] As Figure 4 and Figure 8 shown, when the convex block 711 is not in contact with the push block 706, the push block 706 is close to the side of the rolling mechanism 6 under the elastic force, so that the two groups of briquetting blocks 704 are close to the side of the rolling mechanism 6 on the fixing frame 701. At this time, the cloth-like composite fiber material is not clamped and expanded.

[0073] As the central shaft 304 rotates, the convex block 711 will gradually contact the surface of the push block 706 and push the push block 706 to slide outwards. And when the convex block 711 just contacts the surface of the push block 706 until it pushes the push block 706 to slide to the maximum amplitude; it will synchronously push the second slider 709 to slide outwards on the fixed rod 707 and overcome the elastic force of the spring 708. Furthermore, it makes the push block 706 connected with the connecting rod 705 drive the briquetting block 704 to slide, so that the first slider 703 slides in the sliding rail 702, and when sliding, it will gradually control the two groups of briquetting blocks 704 to approach each other. When the two groups of briquetting blocks 704 clamp the cloth-like composite fiber material, during the continuous outward sliding process of the push block 706, a pulling force on the cloth-like composite fiber material will be generated.

[0074] And width expanding mechanisms 7 are arranged on both sides of the rolling mechanism 6, and the pulling forces generated by the two groups of width expanding mechanisms 7 on the cloth-like composite fiber material are in opposite directions, so that the cloth-like composite fiber material is stretched and unfolded with the rolling position of the rolling mechanism 6 as the center, improving the penetration effect of the liquid of the thermoplastic polymer material.

[0075] When the convex block 711 is continuously rotating, and the pushing distance gradually decreases from pushing the push block 706 to the maximum sliding amplitude, the second slider 709 will slide inward again under the elastic force of the spring 708 until the convex block 711 and the push block 706 are disengaged. At this time, the push block 706 will be reset under the elastic force of the spring 708, and then contact the two groups of pressing blocks 704 to stretch the cloth-like composite fiber material outward. And with the continuous rotation of the central shaft 304, the above process will be repeated periodically. Thus, during the continuous rolling of the rolling mechanism 6, the amplitude expanding mechanism 7 will continuously and periodically stretch the cloth-like composite fiber material to both sides with the rolling position of the rolling mechanism 6 as the center, thereby increasing the expansion of the surface and internal voids of the cloth-like composite fiber material, improving the penetration effect of the thermoplastic polymer material liquid, and enhancing the bonding effect between the cloth-like composite fiber material and the thermoplastic polymer material liquid.

[0076] Meanwhile, when multiple groups of rolling mechanisms 6 are linearly distributed inside the rolling box 3, amplitude expanding mechanisms 7 are installed on both sides of each group of rolling mechanisms 6. Thus, during the transportation of the cloth-like composite fiber material inside the rolling box 3, it can be repeatedly rolled by multiple groups of rolling mechanisms 6 to achieve continuous operation, reduce the pause time between processes, and improve the overall production efficiency; and during each rolling, it will be stretched and unfolded by two groups of amplitude expanding mechanisms 7, realizing the stretching and rolling of the cloth-like composite fiber material at different stages, ensuring that the thermoplastic polymer material liquid can uniformly penetrate into each part of the fiber cloth, and further enhancing the bonding effect between the cloth-like composite fiber material and the thermoplastic polymer material liquid.

[0077] It should be noted that a tension adjusting wheel 8 is also installed inside the rolling box 3. The tension adjusting wheel 8 is used to adjust the tension of the cloth-like composite fiber material, so that when the amplitude expanding mechanism 7 stretches the cloth-like composite fiber material outward, the cloth-like composite fiber material can always be kept in a taut state, thereby ensuring the effective transportation of the cloth-like composite fiber material. A tension adjusting wheel 8 is installed on the outer side of each amplitude expanding mechanism 7 relative to the rolling mechanism 6, and the upper end of the tension adjusting wheel 8 is connected to a lifting slide rod 801; meanwhile, a top block 802 is slidably installed inside the control box 301, and the upper end of the top block 802 is connected to the lifting slide rod 801; the lower end of the top block 802 abuts against the surface of the control wheel 710 under the action of gravity.

[0078] As Figure 4 and Figure 8 shown, when the amplitude expanding mechanism 7 does not stretch and expand the cloth-like composite fiber material, the convex block 711 abuts against the lower end surface of the top block 802, causing the top block 802 to push up the lifting slide rod 801. Thus, when the cloth-like composite fiber material passes through the tension adjusting wheel 8 and enters the amplitude expanding mechanism 7 and the rolling mechanism 6, the cloth-like composite fiber material always remains in a flat state.

[0079] When the rolling mechanism 6 and the width expanding mechanism 7 operate synchronously, when the control wheel 710 rotates and controls the convex block 711 to slide towards the push block 706, the convex block 711 will gradually disengage from the contact with the top block 802, so that the top block 802 gradually slides downward under the action of gravity until it abuts against the surface of the control wheel 710. When the top block 802 slides downward, it will control the tension adjusting wheel 8 to pull the cloth-like composite fiber material downward, further stretching the conveying path of the cloth-like composite fiber material before it enters the width expanding mechanism 7, so that when the width expanding mechanism 7 stretches and expands the cloth-like composite fiber material outward, the width expanding mechanism 7 is always pulled by the tension adjusting wheel 8 to keep the whole body taut, thereby controlling the effective conveying of the cloth-like composite fiber material in the rolling box 3.

[0080] Further, a three-way pipe 504 is connected to the surface of the solvent tank 503, one end of the three-way pipe 504 penetrates into the interior of the control box 301, and the other end of the three-way pipe 504 faces the outside; one-way valves 505 are provided at one end of the three-way pipe 504 facing the outside and at one end connected to the solvent tank 503. The one-way valve 505 connecting the solvent tank 503 can only allow the air in the three-way pipe 504 to enter the solvent tank 503, and the one-way valve 505 connecting to the outside can only allow the outside air to enter the three-way pipe 504.

[0081] The surface of the central shaft 304 is also connected with a turntable 305. A connecting rod 306 is rotatably installed at a non - central position on the surface of the turntable 305. The other end of the connecting rod 306 is rotatably connected with a piston rod 506. The piston rod 506 is U - shaped. Piston blocks are respectively arranged at both ends of the piston rod 506 and are inserted into two groups of three - way pipes 504. When the driving device 302 drives the rolling mechanism 6 and the width - expanding mechanism 7 to operate, the central shaft 304 is synchronously controlled to drive the turntable 305 to rotate, thereby controlling the connecting rod 306 to pull the piston rod 506 to slide back and forth in the three - way pipe 504. When the piston rod 506 slides outwards from the three - way pipe 504, air is drawn in from the outside into the three - way pipe 504. When the piston rod 506 slides inwards from the three - way pipe 504, the drawn - in air is injected into the solvent tank 503. Further, the thermoplastic polymer material liquid in the solvent tank 503 is transported in the spray pipe 501 by air pressure and sprayed out from the nozzle 502. A heating module is also attached to the solvent tank 503, which is used to pre - heat the thermoplastic polymer material liquid in the solvent tank 503, so that its viscosity is significantly reduced and it is easier to flow. This enhanced fluidity facilitates the thermoplastic polymer material liquid to be quickly and evenly sprayed onto the surface of the fiber cloth, ensuring uniform coverage. At the same time, a temperature control module is also arranged in the rolling box 3, which is used to set the temperature in the rolling box 3 at an appropriate processing temperature to ensure the best flow state of the thermoplastic polymer material liquid during spraying and rolling, prevent insufficient fluidity due to too low temperature during the processing, or condensation due to temperature reduction, which affects the infiltration effect, and ensure that it can quickly cover and penetrate the surface of the composite material.

[0082] Finally, the synchronous operation of the spraying mechanism 5, the rolling mechanism 6, the width - expanding mechanism 7 and the tension - adjusting pulley 8 is realized, so as to fully and effectively roll the cloth - like composite fiber material, and improve the bonding effect between the cloth - like composite fiber material and the thermoplastic polymer material liquid.

[0083] Finally, after the cloth - like composite fiber material is rolled, it is conveyed out of the rolling box 3 and enters the subsequent cooling stage.

[0084] Embodiment 2:

[0085] On the basis of Embodiment 1, this solution proposes a control system for a pre - impregnation rolling machine for thermoplastic composite fiber materials, including a main control module, an unwinding control module, a drying control module, a spraying control module, a rolling control module, a width - expanding control module, and a tension - adjusting module;

[0086] The main control module is used to receive the signal data collected by other modules, process the data and make decisions, and issue corresponding control instructions; the unwinding control module is used to control the unwinding speed and tension of the cloth-like composite fiber material on the unwinding rack to ensure the stable and uniform transportation of the cloth-like composite fiber material; the drying control module is used to control the heating temperature in the oven to ensure that the cloth-like composite fiber material reaches the required temperature before entering the rolling box; the spraying control module is used to control the spraying amount of the thermoplastic polymer material liquid to ensure that the thermoplastic polymer material liquid is evenly sprayed on the surface of the cloth-like composite fiber material; the rolling control module is used to control the rotation speed and pressure of the rolling mechanism to ensure the full combination of the thermoplastic polymer material liquid and the cloth-like composite fiber material; the width expansion control module is used to control the clamping and stretching process of the width expansion mechanism to increase the surface voids of the cloth-like composite fiber material; the tension adjustment module is used to control the stretching tension of the tension adjustment wheel 8 on the cloth-like composite fiber material to ensure that it remains taut during the width expansion and rolling processes.

[0087] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A prepreg rolling machine for thermoplastic composite fiber materials, comprising unwind racks, an oven, and a rolling box that are linearly distributed, characterized in that, Guide wheels are installed in both the oven and the rolling box. The cloth-like composite fiber material arranged on the unwinding frame passes through the oven and enters the rolling box under the guiding and conveying action of the guide wheels. At least one group of spraying mechanisms and one group of rolling mechanisms are installed in the rolling box. Expanding mechanisms are installed on both sides of each group of rolling mechanisms in the rolling box. A control box is provided on the side of the rolling box, and a driving device and a transmission mechanism are installed inside the control box. The driving device drives the spraying mechanism, the rolling mechanism and the expanding mechanism to operate through the transmission mechanism. The spraying mechanism sprays thermoplastic polymer material liquid on the surfaces of both sides of the cloth-like composite fiber material when the cloth-like composite fiber material passes through, and the rolling mechanism applies rolling pressure to the surfaces of both sides of the cloth-like composite fiber material when the cloth-like composite fiber material passes through; the expanding mechanism includes two groups of fixed frames installed in the rolling box and distributed on the upper line, and pressure blocks are slidably installed in the two groups of fixed frames. The two groups of pressure blocks form a clamping tension on the cloth-like composite fiber material under the drive of the transmission mechanism, and the tension direction is away from one side of the rolling mechanism.

2. The prepreg rolling machine for thermoplastic composite fiber materials and its control system according to claim 1, characterized in that, The rolling mechanism includes two sets of transmission shafts rotatably mounted on a mounting frame arranged inside the rolling box, the two sets of transmission shafts are distributed up and down, and rolling wheels are arranged on the surfaces of the two sets of transmission shafts. The transmission mechanism is used to drive the two sets of rolling wheels to rotate.

3. The prepreg rolling machine and its control system for thermoplastic composite fiber materials according to claim 2, characterized in that, The transmission mechanism includes a central shaft rotatably connected to the control box, the driving device is connected to the central shaft through a transmission member, and a driving gear is provided on the surface of the central shaft; the two groups of transmission shafts are provided with driven gears on one end surface located inside the control box, and the driving gear is meshed and connected with the two groups of driven gears at the same time.

4. The prepreg rolling machine and its control system for thermoplastic composite fiber materials according to claim 3, characterized in that, The surface of the fixed frame is provided with a slide rail, and the inside of the slide rail is slidably installed with a first slider, the pressure block is installed on the first slider, the surface of the pressure block is connected with a connecting rod, one end of the connecting rod passes through a slide groove provided on the surface of the rolling box and is inserted into the control box, the slide groove and the slide rail are distributed in parallel, the outer ends of the two groups of connecting rods in the expansion mechanism are connected with push blocks, the surface of the push block is provided with a second slider, the second slider is sleeved on the surface of the fixed rod installed in the control box, the surface of the fixed rod is sleeved with a spring, and the surface of the control wheel is provided with at least two groups of circumferentially distributed protrusions.

5. The prepreg rolling machine for thermoplastic composite fiber materials and its control system according to claim 4, characterized in that, The surface of the pressing block facing the cloth-like composite fiber material is distributed in parallel with the cloth-like composite fiber material.

6. The prepreg rolling machine for thermoplastic composite fiber materials and its control system according to claim 4, characterized in that, A tension adjusting wheel is installed on one side of each group of expansion mechanisms inside the rolling box. The tension adjusting wheel is arranged on the outside of the expansion mechanism relative to the rolling mechanism. The upper end of the tension adjusting wheel is connected to a lifting slide bar. A top block is slidably installed inside the control box, and the upper end of the top block is connected to the lifting slide bar.

7. A prepreg rolling press and its control system for thermoplastic composite fiber materials according to claim 3, characterized in that, The spray mechanism comprises two groups of spray pipes installed in the rolling box, the two groups of spray pipes are distributed up and down, and the opposite sides of the two groups of spray pipes are provided with spray heads which are evenly distributed and communicated with the inside.

8. A prepreg rolling machine and its control system for thermoplastic composite fiber materials according to claim 7, characterized in that, The outer ends of the two groups of spray pipes are both passed through the outside of the rolling box and are equipped with a connected solvent box.

9. A prepreg rolling machine and its control system for thermoplastic composite fiber materials according to claim 7, characterized in that, The surface of the solvent tank is connected with a three-way pipe which is communicated. One end of the three-way pipe penetrates into the interior of the control box, and the other end of the three-way pipe faces outward. One-way valves are provided at both the end of the three-way pipe facing outward and the end connected to the solvent tank. A turntable is also connected to the surface of the central shaft. A connecting rod is rotatably installed at a non-central position on the surface of the turntable. The other end of the connecting rod is rotatably connected to a piston rod. The piston rod is U-shaped, and piston blocks are respectively provided at both ends of the piston rod and are inserted into two groups of three-way pipes.

10. A control system for a prepreg rolling machine for thermoplastic composite fiber materials according to any one of claims 1-9, characterized in that, It includes a main control module, an unwinding control module, a drying control module, a spraying control module, a rolling control module, a width expanding control module, and a tension adjusting module; among which: The unwinding control module is used to control the unwinding speed and tension of the cloth-like composite fiber material by the unwinding rack. The drying control module is used to control the heating temperature in the oven. The spraying control module is used to control the spraying amount of the thermoplastic polymer material liquid. The rolling control module is used to control the rotation speed and pressure of the rolling mechanism. The width expanding control module is used to control the clamping and stretching degree of the width expanding mechanism. The tension adjusting module is used to control the stretching tension of the cloth-like composite fiber material by the tension adjusting wheel.

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