A kind of carbon fiber prepreg preparation uses hot roller gap automatic adjusting mechanism

Abstract

The application discloses a kind of carbon fiber prepreg preparation with hot roller gap automatic adjusting mechanism, it is related to carbon fiber prepreg preparation technical field, including shell, shell is equipped with guide cover, first heat conduction roller and second heat conduction roller, first heat conduction roller can be moved in the direction of travel of material body in guide cover;Shell inner wall is equipped with locking mechanism, locking mechanism is used to lock material body in shell;Shell inner bottom is also equipped with preheating airflow circulation system, preheating airflow circulation system is used to heat air entering to shell inside from outside, heated air penetrates fiber layer from the lower surface of material body upwards, heat is evenly brought into fiber bundle inside, and resin is heated and volatilized smoke-like volatile from material body above is carried away.The present application can be heated to carbon fiber prepreg all-around evenly, high-efficiency volatile discharge and local strengthening treatment, significantly improve the infiltration quality, thickness uniformity and process adaptability of prepreg.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber prepreg preparation technology, and specifically to an automatic adjustment mechanism for the gap between hot rollers used in carbon fiber prepreg preparation. Background Technology

[0002] Carbon fiber prepreg is an important component of carbon fiber reinforced resin matrix composites. Its preparation process typically involves impregnating carbon fiber tows or fabrics with molten resin, followed by heating, rolling, and shaping with hot rollers to ultimately form a uniform prepreg product. The temperature control and gap adjustment precision of the hot rollers directly affect the resin impregnation effect, the uniformity of the prepreg thickness, and the internal porosity, making them core factors determining product quality.

[0003] Currently, the hot roller system in existing carbon fiber prepreg preparation equipment mainly suffers from the following technical problems: First, the adjustment method for the gap of the hot roller is simplistic and lacks precision control. Existing equipment typically employs a vertically opposing structure of a fixed roller and a moving roller, with the moving roller usually driven by a screw or hydraulic cylinder for gap adjustment. While this structure allows for basic gap adjustment, the position of the hot roller is locked after adjustment, making it impossible to dynamically adjust based on differences in resin distribution across the width of the prepreg. When the carbon fiber prepreg experiences localized thickness fluctuations due to uneven resin coating or fiber arrangement deviations, the fixed-position hot roller cannot provide targeted compensation, easily leading to problems such as uneven prepreg thickness and resin content deviations.

[0004] Secondly, there is a lack of effective lateral gap adjustment capability: existing hot roller mechanisms can only adjust the gap in a direction perpendicular to the prepreg surface, and cannot move along the width direction (lateral) of the prepreg. In actual production, different areas of the carbon fiber prepreg may have differences in resin viscosity or uneven impregnation. If the hot roller cannot move laterally to reheat or repress specific areas, it is difficult to achieve uniform resin impregnation and bubble removal, affecting the interfacial bonding quality and interlaminar shear strength of the prepreg.

[0005] Third, insufficient volatile matter emission during heating affects the cleanliness of the hot roller: Some resin formulations contain low-boiling-point solvents or volatile components, which form fumes during the hot roller heating process. Existing equipment mostly uses open exhaust or simple top-draft structures, failing to effectively utilize hot air flow to guide and expel volatile matter in a directional manner. Volatile matter easily adheres to the surface of the hot roller, forming scale or a contamination layer, which not only reduces the heat transfer efficiency of the hot roller but may also cause surface contamination of the prepreg, affecting the product's appearance and performance.

[0006] Fourth, there is a lack of effective local preheating and locking heating functions: When local areas of the carbon fiber prepreg have excessively high resin viscosity or poor wetting, existing equipment usually requires transferring the material to other equipment for secondary heating treatment. This not only reduces production efficiency, but also makes the material susceptible to contamination or wrinkling during the secondary transfer process. Existing equipment lacks a mechanism to lock and repeatedly heat and press local areas of the prepreg in situ, making it difficult to meet the requirements of high-precision and high-efficiency preparation.

[0007] In summary, the hot roller mechanism in existing carbon fiber prepreg preparation equipment has significant shortcomings in terms of gap adjustment flexibility, lateral movement capability, volatile matter emission efficiency, local heating function, and thermal decay control. There is an urgent need to provide an integrated mechanism that can realize automatic adjustment of hot roller gap, lateral movement heating, effective exhaust, and local locking reheating to meet the preparation requirements of high-quality carbon fiber prepreg. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art. The purpose is to provide an automatic adjustment mechanism for the gap of hot rollers in the preparation of carbon fiber prepreg. By setting a first heat conduction system that can be moved laterally, a bottom preheating airflow circulation system and a locking mechanism, the present invention achieves all-round uniform heating of carbon fiber prepreg, efficient volatile matter discharge and local strengthening treatment, which significantly improves the impregnation quality, thickness uniformity and process adaptability of the prepreg.

[0009] This invention is achieved through the following technical solution: An automatic adjustment mechanism for the gap of hot rollers in carbon fiber prepreg preparation includes a housing and a guide structure connected to the housing receiving end. The housing is provided with a guide cover, a first heat-conducting roller and a second heat-conducting roller. The guide cover is connected to an external exhaust fan. The first heat-conducting roller is located above the second heat-conducting roller, and the first heat-conducting roller can move along the direction of the material body inside the guide cover. The inner wall of the housing is also provided with a locking mechanism, which is used to lock the material body inside the housing; The bottom of the shell is also equipped with a preheating airflow circulation system, which is used to heat the air entering the shell from the outside. The hot air penetrates the fiber layer from the lower surface of the material body upwards, bringing heat evenly into the fiber bundle and carrying away the volatiles formed by the resin under heat from the top of the material body.

[0010] Furthermore, the guide cover is also provided with an electric slide rail, which is distributed along the direction of the material body; Both ends of the first heat-conducting roller are provided with connecting seats, and a pressing electric push rod is connected to the connecting seat. The fixed end of the pressing electric push rod is connected to the output end of the electric slide rail.

[0011] Furthermore, the inner wall slope of the guide cover towards the discharge end of the housing is less than the inner wall slope of the guide cover towards the receiving end of the housing.

[0012] Furthermore, the connecting seat includes connecting cavities fixed at both ends of the first heat-conducting roller, and heat-conducting pipes are provided on the connecting cavities, the heat-conducting pipes being inserted into the interior of the first heat-conducting roller; A heat-conducting element is embedded between the inner cavity of the first heat-conducting roller and the heat-conducting pipe, and the inner cavity of the heat-conducting pipe is connected to the inner cavity of the connecting cavity.

[0013] Furthermore, a first rotating seat is fixed to the receiving end of the connecting cavity, and a baffle is fixed on the first rotating seat. The output end of the pressing electric push rod rotates between the baffle and the connecting cavity, and the receiving end of the first rotating seat is connected to an external heat conveying structure.

[0014] Furthermore, a detector is fixed on one side of the guide cover, and the control ends of the detector, the electric slide rail, and the pressure electric push rod are all connected to an external controller.

[0015] Furthermore, the top of the guide cover is provided with a discharge port, which extends beyond the top of the housing. An electric valve is also provided inside the discharge port. The bottom of the housing is also provided with several mesh holes. The preheating airflow circulation system is located between the mesh holes and the second heat-conducting roller.

[0016] Furthermore, the preheating airflow circulation system includes a heat-conducting mesh cover, a mounting mesh shell, and an electric heating spring. The heat-conducting mesh cover is fixed inside the shell and forms a cavity with the shell. The heat-conducting mesh cover is located below the guide cover. The mounting mesh shell is fixed inside the cavity. The electric heating spring is fixed inside the mounting mesh shell. The heat-conducting mesh cover is used to evenly distribute the airflow heated by the electric heating spring onto the material body.

[0017] Furthermore, the locking mechanism includes a pressing member, which is fixed to the inner wall of the housing and close to the receiving end and the discharging end of the housing. The inner wall of the housing is also provided with a supporting electric push rod connected to an external controller. The supporting electric push rod is located below the pressing member, and a second transfer roller is rotatably provided at the upper end of the supporting electric push rod.

[0018] Furthermore, the pressing member includes a first transfer roller that abuts against the material body, the first transfer roller being located above the second transfer roller, and the surface of the first transfer roller being elastic; It also includes a second rotating seat that rotates at both ends of the first transfer roller, and a spring plunger is fixed between the second rotating seat and the guide cover.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The present invention sets an electric slide rail on the guide cover and connects the first heat-conducting roller to the output end of the electric slide rail through a pressing electric push rod. When the detector detects abnormal local resin viscosity or uneven wetting in the material body, the external controller can control the electric slide rail to drive the first heat-conducting roller to move laterally along the material body, so as to realize the rolling heating of the first heat-conducting roller on the material body. This structure overcomes the defects of the prior art that the heat roller can only adjust the gap vertically and cannot move laterally. It enables the heat roller to reheat and repress specific areas of the prepreg, ensuring that the resin can uniformly and thoroughly wet each carbon fiber bundle, effectively promoting the formation of a good interface bond between the fiber and the resin. At the same time, the mechanical pressure forces the air bubbles entrained in the resin to be discharged, greatly reducing the voids and defects inside the prepreg. 2. This invention features a heat-conducting mesh cover with an electric heating spring at the bottom of the housing, and an electric valve at the discharge end of the guide cover. During operation, the external exhaust structure draws air through the guide cover, and external air enters through the mesh at the bottom of the housing and is heated by the electric heating spring. The heat-conducting mesh cover evenly disperses the heated air and blows it onto the lower surface of the material body, achieving preheating of the area surrounding the first and second heat-conducting rollers. Simultaneously, the heated air penetrates the fiber layer from the lower surface of the material body upwards, evenly carrying heat into the fiber bundles and carrying away the fumes-like volatiles emitted by the resin from above the material body, keeping the surface of the heated rollers clean. Furthermore, the guide cover has a smaller slope near the discharge end of the housing, which, combined with the precise control of the exhaust speed by the electric valve, creates a smooth thermal attenuation gradient from the heating end to the discharge end of the material body. This avoids rapid cooling of the prepreg after heating, which can cause thermal stress or warping deformation. This structure effectively solves the problems of volatiles easily contaminating the heated rollers, sudden temperature changes in the prepreg, and uneven heat penetration in the prior art. 3. This invention features a pressing component and a supporting electric push rod on the inner wall of the housing, and spring plungers at both ends of the first transfer roller. When the detector detects excessively high local resin viscosity in the material body, the external controller stops the material body transport equipment and drives the supporting electric push rod to press the material body against the pressing component via the second transfer roller, thus locking the material body within the housing in conjunction with the first transfer roller. In this state, the material body can be in contact with the hot air transferred by the heat-conducting mesh for a longer period of time. Simultaneously, the electric slide rail drives the first heat-conducting roller to move repeatedly on the material body, allowing heat to be quickly and evenly transferred to the local area of ​​the material body, effectively reducing the resin viscosity. This structure overcomes the drawback of existing technologies where prepregs with abnormal local viscosity need to be transferred to other equipment for secondary heating. It achieves locking, repeated heating, and repressurization in situ, improving production efficiency and avoiding the risk of material contamination or damage during transport. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram illustrating the usage state of the present invention; Figure 2 This is a diagram showing the connection structure between the guide cover and the housing in this invention; Figure 3 for Figure 2 Schematic diagram of the end face; Figure 4 This is a diagram showing the connection structure between the electric push rod and the electric slide rail in this invention. Figure 5 This is a diagram showing the connection structure between the first transfer roller and the spring plunger in this invention; Figure 6 This is a diagram showing the connection structure between the heat pipe and the first heat-conducting roller in this invention. Figure 7 For the present invention Figure 3 Enlarged view of section A; Figure 8 This is a diagram showing the connection structure between the first heat-conducting roller and the second heat-conducting roller in this invention.

[0021] The attached diagram shows the markings and corresponding component names: 1. Guide structure; 2. Housing; 21. Connecting pipe; 22. Mesh; 3. Guide cover; 31. Electric valve; 4. First heat-conducting roller; 41. Second heat-conducting roller; 42. Electric slide rail; 43. Pressing electric push rod; 44. Heat-conducting pipe; 45. First rotating seat; 46. Connecting cavity; 47. Heat-conducting component; 48. Baffle; 5. First transfer roller; 51. Second transfer roller; 52. Second rotating seat; 53. Spring plunger; 54. Supporting electric push rod; 6. Mounting mesh shell; 61. Electric heating spring; 62. Heat-conducting mesh cover; 7. Pressing component; 8. Material body; 9. Detector. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention. Example

[0023] like Figures 1 to 8As shown, the present invention includes a housing 2 and a guide structure 1 connected to the receiving end of the housing 2. The housing 2 is provided with a guide cover 3, a first heat-conducting roller 4 and a second heat-conducting roller 41. The guide cover 3 is connected to an external exhaust fan. The first heat-conducting roller 4 is located above the second heat-conducting roller 41 and can move within the guide cover 3 along the direction of the material body 8. The inner wall of the housing 2 is also provided with a locking mechanism for locking the material body 8 within the housing 2. A preheating airflow circulation system is also provided at the bottom of the housing 2 for heating the air entering the housing 2 from the outside. The hot air penetrates the fiber layer from the lower surface of the material body 8 upwards, uniformly bringing heat into the fiber bundle and carrying away the fumes of resin volatilized by the heat from above the material body 8.

[0024] To address the significant shortcomings of existing carbon fiber prepreg preparation equipment in terms of the flexibility of gap adjustment, lateral movement capability, volatile matter emission efficiency, and local heating function of the hot roller mechanism, this technical solution incorporates a housing 2 on one side of the existing guide structure 1. The housing 2 has a receiving end and a discharging end on its two sides. A connecting pipe 21 is fixed to the discharging end of the housing 2 and is sleeved onto the material body 8. The receiving end of the housing 2 is connected to the guide structure 1. The material body 8 to be processed enters the housing 2 from the discharging end and is then discharged from the receiving end under the action of the guide structure 1 on the housing 2. Inside the housing 2, a guide cover 3, a first heat-conducting roller 4, and a second heat-conducting roller 41 are respectively installed. The guide cover 3 is located at the upper part of the housing 2, guiding... The cover 3 can be placed over the material body 8 passing through the shell 2. The first heat-conducting roller 4 is located inside the guide cover 3, and the second heat-conducting roller 41 is located directly below the first heat-conducting roller 4. The material body 8 to be processed is located between the first heat-conducting roller 4 and the second heat-conducting roller 41. At the same time, the first heat-conducting roller 4 can move within the guide cover 3 along the receiving end and the discharge end of the shell 2, realizing dynamic adjustment of the position of the first heat-conducting roller 4 within the guide cover 3 along the moving direction of the material body 8, thereby achieving adjustment of the lateral gap between the first heat-conducting roller 4 and the second heat-conducting roller 41. In this way, when the local resin viscosity of the material body 8 to be processed is abnormal or the wetting is uneven, the first heat-conducting roller 4 can move laterally along the material body 8, realizing the rolling heating of the first heat-conducting roller 4 on the material body 8. This structure overcomes the shortcomings of existing technologies where the hot roller can only adjust the gap vertically and cannot move laterally. It enables the hot roller to reheat and repress specific areas of the prepreg, ensuring that the resin can evenly and thoroughly impregnate each carbon fiber bundle, effectively promoting the formation of a good interfacial bond between the fiber and the resin. At the same time, mechanical pressure forces out air bubbles trapped in the resin, greatly reducing voids and defects inside the prepreg.

[0025] Meanwhile, this technical solution also includes a preheating airflow circulation system within the housing 2. This system heats the air entering the housing 2 and evenly disperses the heated air before blowing it onto the lower surface of the material body 8, thus preheating the area surrounding the first heat-conducting roller 4 and the second heat-conducting roller 41. Simultaneously, the hot air penetrates the fiber layer from the lower surface of the material body 8, evenly carrying heat into the fiber bundles and carrying away the fumes emitted by the heated resin from above, keeping the surfaces of the first and second heat-conducting rollers 4 and 41 clean.

[0026] This technical solution also includes a locking mechanism within the housing 2. This locking mechanism temporarily fixes the material body 8 within the housing 2. Thus, when excessively high local resin viscosity is detected in the material body 8 within the housing 2, the external material transport equipment is stopped, and the locking mechanism locks the material body 8 within the housing 2. In this state, the material body 8 can be in contact with the hot air transferred by the preheating airflow circulation system for a longer period. Simultaneously, the first heat-conducting roller 4 repeatedly moves on the material body 8, allowing heat to be quickly and evenly transferred to the localized area of ​​the material body 8, effectively reducing the resin viscosity. This structure overcomes the drawback of existing technologies where prepregs with abnormal local viscosity need to be transferred to other equipment for secondary heating. It achieves locking, repeated heating, and repressurization in situ, improving production efficiency and avoiding the risk of material contamination or damage during transport.

[0027] The guide cover 3 is also provided with an electric slide rail 42, which is distributed along the radial direction of the material body 8; both ends of the first heat-conducting roller 4 are provided with connecting seats, and the connecting seats are connected with a pressing electric push rod 43, the fixed end of the pressing electric push rod 43 is connected to the output end of the electric slide rail 42.

[0028] In this embodiment, in order to ensure that the first heat-conducting roller 4 can move in the direction of movement of the material body 8 within the guide cover 3, an electric slide rail 42 is provided in the guide cover 3. The electric slide rail 42 is a prior art technology. After being powered on, it can drive the first heat-conducting roller 4 connected to it to move in the direction of movement of the material body 8 within the guide cover 3, thereby realizing the dynamic adjustment of the position of the first heat-conducting roller 4 within the guide cover 3.

[0029] The function of the set pressure electric push rod 43 is to adjust the position of the first heat-conducting roller 4 in the vertical direction, thereby adjusting the gap between the first heat-conducting roller 4 and the second heat-conducting roller 41 according to the thickness of the material body 8, so as to meet the processing of material bodies 8 with different thicknesses.

[0030] The slope of the inner wall of the guide cover 3 facing the discharge end of the housing 2 is less than the slope of the inner wall of the guide cover 3 facing the receiving end of the housing 2.

[0031] In existing carbon fiber prepreg preparation methods, there is insufficient control over thermal attenuation in the heated roller area. In existing equipment, the prepreg typically enters the cooling or winding section directly after heating. The lack of a reasonable thermal attenuation gradient design between the heating end and the discharge end can easily lead to rapid cooling of the prepreg after it leaves the heated roller, resulting in thermal stress concentration or warping deformation, which affects the dimensional stability and flatness of the product. Therefore, in this embodiment, the inner wall slope of the guide cover 3 near the discharge end of the housing 2 is less than the inner wall slope of the guide cover 3 near the receiving end of the housing 2. This design allows the preheating airflow circulation system to heat the material body 8, resulting in a stable thermal attenuation gradient from the heating point inside the housing 2 to the discharge end, thus avoiding rapid cooling of the prepreg after heating and the generation of thermal stress or warping deformation.

[0032] The connecting seat includes connecting cavities 46 fixed at both ends of the first heat-conducting roller 4. A heat-conducting pipe 44 is provided on the connecting cavity 46 and inserted into the interior of the first heat-conducting roller 4. A heat-conducting element 47 is embedded between the inner cavity of the first heat-conducting roller 4 and the heat-conducting pipe 44, and the inner cavity of the heat-conducting pipe 44 is connected to the inner cavity of the connecting cavity 46.

[0033] In this embodiment, in order to ensure that the first heat-conducting roller 4 can preheat the material body 8, the connecting seat includes a connecting cavity 46 connected to both ends of the first heat-conducting roller 4. A heat-conducting pipe 44 extending into the first heat-conducting roller 4 is provided in the connecting cavity 46. At the same time, a heat-conducting component 47 is also provided in the first heat-conducting roller 4. In this way, when the material body 8 penetrates through the inside of the shell 2, the external heat-conducting medium will penetrate through the inside of the heat-conducting pipe 44. During this process, the external heat-conducting medium will transfer heat to the first heat-conducting roller 4 through the heat-conducting pipe 44 and the heat-conducting component 47, thereby achieving the purpose of the first heat-conducting roller 4 transferring heat to the carbon fiber prepreg.

[0034] When the first heat-conducting roller 4 heats the material body 8, the second heat-conducting roller 41 located at the bottom can stably heat the material body 8, while the first heat-conducting roller 4 moves to reheat the material body 8, thereby achieving multiple heating of the material body 8 that penetrates the shell 2.

[0035] In another embodiment, the internal structure of the second heat-conducting roller 41 is the same as that of the first heat-conducting roller 4. When the first heat-conducting roller 4 and the second heat-conducting roller 41 transfer heat to the carbon fiber prepreg, the heat transferred by the first heat-conducting roller 4 and the second heat-conducting roller 41 to the carbon fiber prepreg can soften the resin on the carbon fiber prepreg and significantly reduce its viscosity, thereby uniformly and thoroughly impregnating each carbon fiber filament and ensuring a good interfacial bond between the fiber and the resin.

[0036] During the resin impregnation process of carbon fiber, the resin will entrain air and form bubbles. When the first heat-conducting roller 4 and the second heat-conducting roller 41 transfer heat to the carbon fiber prepreg, the heating and crushing action of the first heat-conducting roller 4 and the second heat-conducting roller 41 makes the resin flow better on the one hand, and forces the bubbles out through mechanical pressure on the other hand, which greatly reduces the voids and defects inside the prepreg.

[0037] The receiving end of the connecting cavity 46 is fixed with a first rotating seat 45, and a baffle 48 is fixed on the first rotating seat 45. The output end of the pressing electric push rod 43 rotates between the baffle 48 and the connecting cavity 46. The receiving end of the first rotating seat 45 is connected to an external heat transfer structure.

[0038] In this embodiment, in order to ensure that the pressing electric push rod 43 can be rotatably connected with the first heat-conducting roller 4, a first rotating seat 45 is also provided on the connecting cavity 46, and a baffle 48 is also provided on the first rotating seat 45. In this way, the first rotating seat 45 passes through the output end of the pressing electric push rod 43, and the baffle 48 is used to limit the pressing electric push rod 43 to prevent the pressing electric push rod 43 from falling off the first rotating seat 45.

[0039] A detector 9 is fixed on one side of the guide cover 3. The control ends of the detector 9, the electric slide rail 42, and the pressure electric push rod 43 are all connected to an external controller.

[0040] In this embodiment, the detector 9 can be a dielectric sensor. The dielectric sensor indirectly reflects the viscosity change of the resin by measuring the change in the dielectric constant of the material body 8. Then, the detection data is transmitted to an external controller. The external controller then controls the moving speed of the output end of the electric slide rail 42 according to the detection data of the material body 8, thereby adjusting the rolling speed of the first heat-conducting roller 4 on the material body 8, so as to realize the heating of the material body 8 by the first heat-conducting roller 4.

[0041] The top of the guide cover 3 is provided with a discharge port, which extends beyond the top of the housing 2. An electric valve 31 is also provided inside the discharge port. The bottom of the housing 2 is also provided with several mesh holes 22. The preheating airflow circulation system is located between the mesh holes 22 and the second heat-conducting roller 41.

[0042] According to the production process of carbon fiber prepreg, some resin formulations may contain low-boiling-point solvents or volatile components. This causes the carbon fiber prepreg to volatilize into a mist-like substance when heated. If these substances cannot be discharged in time, they will adhere to the surface of the hot roller, which will hinder the heating of the carbon fiber prepreg by the hot roller. To solve this problem, the top of the guide cover 3 in this embodiment is provided with a discharge port, which is connected to an external exhaust device. At the same time, an electric valve 31 is provided in the discharge port. When the exhaust device is working, the electric valve 31 can be used to adjust the speed at which the air in the guide cover 3 is discharged from the discharge port, thereby precisely controlling the discharge speed of the guide cover 3.

[0043] Meanwhile, in order to ensure that outside air can enter the housing 2 and be heated by the preheating airflow circulation system, several mesh holes 22 are provided at the bottom of the housing 2. When the exhaust device is working, outside air can enter the housing 2 through the mesh holes 22 on the housing 2, so as to achieve the purpose of the preheating airflow circulation system to heat the air.

[0044] The preheating airflow circulation system includes a heat-conducting mesh cover 62, a mounting mesh shell 6, and an electric heating spring 61. The heat-conducting mesh cover 62 is fixed inside the shell 2 and forms a cavity with the shell 2. The heat-conducting mesh cover 62 is located below the guide cover 3. The mounting mesh shell 6 is fixed inside the cavity. The electric heating spring 61 is fixed inside the mounting mesh shell 6. The heat-conducting mesh cover 62 is used to evenly distribute the airflow heated by the electric heating spring 61 on the material body 8.

[0045] In this embodiment, to ensure that the preheating airflow circulation system can heat the air entering through the mesh 22 of the housing 2, the preheating airflow circulation system includes a heat-conducting mesh cover 62, a mounting mesh shell 6, and an electric heating spring 61. The heat-conducting mesh cover 62 has a conical structure, and multiple circular holes are opened in the upper part of the heat-conducting mesh cover 62. Thus, when the first heat-conducting roller 4 and the second heat-conducting roller 41 heat the carbon fiber prepreg, the exhaust port of the guide cover 3 is connected to an external exhaust device. When the external exhaust device is working, the operator adjusts the exhaust speed of the guide cover 3 through the electric valve 31, thereby precisely controlling the exhaust speed of the guide cover 3. When the hot air inside the guide cover 3 is discharged to the external exhaust device, the outside air will pass through the mesh 22 and enter the heat-conducting mesh cover 6. Inside the heat-conducting mesh cover 62, the electric heating spring 61 inside the heat-conducting mesh cover 62 can heat the air inside the heat-conducting mesh cover 62. Then the heat-conducting mesh cover 62 transfers the heated air to the material body 8, thereby preheating the material body 8 around the first heat-conducting roller 4 and the second heat-conducting roller 41. After the material body 8 is preheated by the heated air, the detector 9 can detect the state of the material body 8 in contact with the first heat-conducting roller 4 and the second heat-conducting roller 41, and then transmit the detected information to the external controller. The external controller can operate the electric slide rail 42, thereby enabling the electric slide rail 42 to move by pressing against the first heat-conducting roller 4 on the electric push rod 43, thereby enabling the first heat-conducting roller 4 to roll on the material body 8, thereby enabling the first heat-conducting roller 4 to heat the material body 8.

[0046] When the heat-conducting mesh 62 transfers heated air to the material body 8, the heated air can pass through the material body 8, which can effectively prevent the generation of air bubbles inside the carbon fiber prepreg, improve the density and interlaminar shear strength of the prepreg. When the hot air passes through the fiber layer, it will evenly carry the heat into the fiber bundle, making the resin viscosity in the center of the fiber bundle decrease more evenly, which helps the resin to wet between the fibers. At the same time, the fumes emitted by the carbon fiber prepreg are directly carried away, which can make the surfaces of the first heat-conducting roller 4 and the second heat-conducting roller 41 cleaner, which is convenient for the first heat-conducting roller 4 and the second heat-conducting roller 41 to heat the material body 8 in the future.

[0047] When the guide shroud 3 discharges hot air, the electric valve 31 can control the speed at which the guide shroud 3 discharges hot air, which can prevent the guide shroud 3 from discharging hot air too quickly. At the same time, the slope of the side of the guide shroud 3 near the discharge end of the housing 2 is smaller. This can achieve the formation of a thermal attenuation gradient in the range of the material body 8 from the heating end to the discharge end when the material body 8 is discharged from the inside of the housing 2, so as to avoid the rapid cooling of the material body 8 after it is heated, thereby ensuring the production quality of the material body 8.

[0048] The locking mechanism includes a pressing member 7, which is fixed to the inner wall of the housing 2 and close to the receiving end and the discharge end of the housing 2. The inner wall of the housing 2 is also provided with a supporting electric push rod 54 connected to an external controller. The supporting electric push rod 54 is located below the pressing member 7, and a second transfer roller 51 is rotatably provided at the upper end of the supporting electric push rod 54.

[0049] In this embodiment, in order to ensure that the locking mechanism can stably and temporarily lock the material body 8 in the housing 2, the locking mechanism includes a pressing member 7. The pressing member 7 is used to apply pressure to the upper surface of the material body 8. At the same time, a supporting electric push rod 54 is also provided in the housing 2. The supporting electric push rod 54 can push the second transmission roller 51 to move towards the pressing member 7, so as to act on the lower surface of the material body 8. Together with the pressing member 7, the purpose of locking the material body 8 is achieved.

[0050] The pressing member 7 includes a first transfer roller 5 that abuts against the material body 8. The first transfer roller 5 is located above the second transfer roller 51, and the surface of the first transfer roller 5 is elastic. It also includes a second rotating seat 52 that rotates at both ends of the first transfer roller 5. A spring plunger 53 is fixed between the second rotating seat 52 and the guide cover 3. The spring plunger 53 drives the first transfer roller 5 and the second transfer roller 51 to be relatively distributed.

[0051] In this embodiment, when the detector 9 detects that the resin viscosity of the material body 8 is high, the detector 9 will transmit a signal to the external controller. Subsequently, the external controller will control the transport equipment of the material body 8 to stop working, thereby stopping the material body 8 from penetrating the housing 2. Then, the external controller will control the support electric push rod 54 to work. The support electric push rod 54 will drive the second transfer roller 51 to press against the material body 8, thereby realizing that the first transfer roller 5 and the second transfer roller 51 lock the material body 8 in the housing 2.

[0052] When the second transfer roller 51 presses against the material body 8, the squeezing force applied by the second transfer roller 51 to the material body 8 will be transmitted to the spring plunger 53 through the first transfer roller 5. The spring plunger 53 can drive the first transfer roller 5 to apply squeezing force to the material body 8 under its own restoring force, thereby realizing the locking of the material body 8 by the first transfer roller 5 and the second transfer roller 51. It should be noted that the spring plunger 53 can be purchased from the market. The structure of the spring plunger 53 is known to those skilled in the art and will not be described in detail here.

[0053] This allows the material body 8 to be in contact with the hot air transferred by the heat-conducting mesh cover 62 for a longer period of time, thereby reducing the resin viscosity on the material body 8. When the material body 8 is partially locked inside the shell 2, the output end of the electric slide rail 42 repeatedly drives the first heat-conducting roller 4 to move on the material body 8, thereby enabling the heat on the first heat-conducting roller 4 to be quickly and evenly transferred to the material body 8, achieving repeated and uniform heating of the material body 8.

[0054] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An automatic adjustment mechanism for the gap between hot rollers used in the preparation of carbon fiber prepreg, comprising a housing (2), characterized in that, The housing (2) is provided with a guide cover (3), a first heat-conducting roller (4) and a second heat-conducting roller (41). The guide cover (3) is connected to an external exhaust fan. The first heat-conducting roller (4) is located above the second heat-conducting roller (41), and the first heat-conducting roller (4) can move along the direction of the material body (8) inside the guide cover (3). The inner wall of the housing (2) is also provided with a locking mechanism, which is used to lock the material body (8) inside the housing (2); The bottom of the shell (2) is also provided with a preheating airflow circulation system. The preheating airflow circulation system is used to heat the air entering the shell (2) from the outside. The hot air penetrates the fiber layer from the lower surface of the material body (8), and brings the heat evenly into the fiber bundle, and carries away the volatiles formed by the resin from the top of the material body (8).

2. The automatic adjustment mechanism for the gap between hot rollers used in the preparation of carbon fiber prepreg according to claim 1, characterized in that, The guide cover (3) is also provided with an electric slide rail (42), which is distributed along the travel direction of the material body (8); Both ends of the first heat-conducting roller (4) are provided with connecting seats, and the connecting seats are connected with a pressing electric push rod (43). The fixed end of the pressing electric push rod (43) is connected to the output end of the electric slide rail (42).

3. The automatic adjustment mechanism for the gap between hot rollers used in the preparation of carbon fiber prepreg according to claim 1, characterized in that, The inner wall slope of the guide cover (3) towards the discharge end of the shell (2) is less than the inner wall slope of the guide cover (3) towards the receiving end of the shell (2).

4. The automatic adjustment mechanism for the gap between hot rollers used in the preparation of carbon fiber prepreg according to claim 2, characterized in that, The connecting seat includes connecting cavities (46) fixed at both ends of the first heat-conducting roller (4), and heat-conducting pipes (44) are provided on the connecting cavities (46), and the heat-conducting pipes (44) are inserted into the interior of the first heat-conducting roller (4); A heat-conducting element (47) is embedded between the inner cavity of the first heat-conducting roller (4) and the heat-conducting pipe (44), and the inner cavity of the heat-conducting pipe (44) is connected to the inner cavity of the connecting cavity (46).

5. The automatic adjustment mechanism for the gap between hot rollers used in the preparation of carbon fiber prepreg according to claim 4, characterized in that, The receiving end of the connecting cavity (46) is fixed with a first rotating seat (45), and a baffle (48) is fixed on the first rotating seat (45). The output end of the pressure electric push rod (43) rotates between the baffle (48) and the connecting cavity (46). The receiving end of the first rotating seat (45) is connected to an external heat transfer structure.

6. The automatic adjustment mechanism for the gap between hot rollers used in the preparation of carbon fiber prepreg according to claim 2, characterized in that, A detector (9) is fixed on one side of the guide cover (3). The control ends of the detector (9), the electric slide rail (42), and the pressure electric push rod (43) are all connected to an external controller.

7. The automatic adjustment mechanism for the gap between hot rollers used in the preparation of carbon fiber prepreg according to claim 1, characterized in that, The top of the guide cover (3) is provided with a discharge port, which extends beyond the top of the housing (2). An electric valve (31) is also provided inside the discharge port. The bottom of the housing (2) is also provided with several mesh holes (22). The preheating airflow circulation system is located between the mesh holes (22) and the second heat-conducting roller (41).

8. The automatic adjustment mechanism for the gap between hot rollers used in the preparation of carbon fiber prepreg according to claim 7, characterized in that, The preheating airflow circulation system includes a heat-conducting mesh cover (62), a mounting mesh shell (6), and an electric heating spring (61). The heat-conducting mesh cover (62) is fixed inside the shell (2) and forms a cavity with the shell (2). The heat-conducting mesh cover (62) is located below the guide cover (3). The mounting mesh shell (6) is fixed inside the cavity. The electric heating spring (61) is fixed inside the mounting mesh shell (6). The heat-conducting mesh cover (62) is used to evenly distribute the airflow heated by the electric heating spring (61) on the material body (8).

9. The automatic adjustment mechanism for the gap between hot rollers used in the preparation of carbon fiber prepreg according to claim 1, characterized in that, The locking mechanism includes a pressing member (7), which is fixed to the inner wall of the housing (2) and close to the receiving end and the discharge end of the housing (2). The inner wall of the housing (2) is also provided with a supporting electric push rod (54) connected to an external controller. The supporting electric push rod (54) is located below the pressing member (7), and a second transfer roller (51) is rotatably provided at the upper end of the supporting electric push rod (54).

10. The automatic adjustment mechanism for the gap between hot rollers used in the preparation of carbon fiber prepreg according to claim 9, characterized in that, The pressing member (7) includes a first transfer roller (5) that abuts against the material body (8), the first transfer roller (5) being located above the second transfer roller (51), and the surface of the first transfer roller (5) being elastic; It also includes a second rotating seat (52) that rotates at both ends of the first transfer roller (5), and a spring plunger (53) is fixed between the second rotating seat (52) and the guide cover (3).

Images