A continuous fiber prepreg yarn production line tension regulation system and production line

Abstract

The utility model belongs to the related technical field of machining, and it discloses a continuous fiber prepreg yarn production line tension regulation and control system and production line, the tension regulation and control system includes a plurality of fiber conveying mechanisms and a plurality of tension detection mechanisms along the production line arrangement, a plurality of fiber conveying mechanisms and a plurality of tension detection mechanisms cross arrangement, and the fiber conveying mechanism is used to provide fiber conveying power, and the tension detection mechanism includes a tension sensor;The fiber conveying mechanism is used for adjusting the fiber conveying speed according to the detection information of the tension sensor to regulate the fiber tension. The utility model proposes along the production line to set up a plurality of fiber conveying mechanisms and a plurality of tension detection mechanisms, can carry out fiber tension detection and adjust in a plurality of parts of the production line, is favorable to maintain the stability of the fiber tension state in the whole production line, avoids the greater tension state fluctuation caused in the different parts of the production line, thereby is favorable to guarantee the finished product quality, realizes the stable and efficient production of continuous fiber product.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical processing technology, and more specifically, relates to a tension control system and production line for a continuous fiber prepreg filament production line. Background Technology

[0002] Continuous fiber reinforced thermoplastic composites are high-strength, high-rigidity, and high-toughness composites manufactured using continuous fibers as reinforcement and thermoplastic resin as the matrix, through a process of impregnating the fibers with thermoplastic resin. Utilizing continuous glass fibers, carbon fibers, aramid fibers, and basalt fibers to reinforce thermoplastic resins such as PP (polypropylene), PE (polyethylene), and PA6 (polyamide 6), these products exhibit lightweight, high rigidity, and high toughness, and are widely used in numerous fields including the automotive industry, aerospace, military, and electronics.

[0003] Achieving large-scale and stable high-quality production has always been a core technological challenge in the industrial-scale preparation of continuous fibers. Among these challenges, the tension state of the fiber bundle during production directly affects the quality of the finished fiber and its subsequent performance in composite materials; therefore, tension control during production is a critical step. Existing continuous fiber prepreg production lines typically incorporate tension control structures at the fiber unwinding point to ensure the fibers are unwound at an appropriate tension. However, these lines often fail to consider changes in fiber state during subsequent processes, resulting in significant fluctuations in fiber tension throughout the production line, which in turn affects the quality of the finished product. Utility Model Content

[0004] In response to the above-mentioned defects or improvement needs of the existing technology, this utility model provides a tension control system and production line for a continuous fiber prepreg filament production line, which is used to solve the problem that the fiber tension state in the existing continuous fiber prepreg production line fluctuates greatly, thereby affecting the quality of the finished product.

[0005] To achieve the above objectives, according to one aspect of this utility model, a tension control system for a continuous fiber prepreg production line is provided, comprising multiple fiber conveying mechanisms and multiple tension detection mechanisms arranged along the production line, wherein the multiple fiber conveying mechanisms and multiple tension detection mechanisms are arranged in a cross pattern, wherein the fiber conveying mechanisms are used to provide fiber conveying power, and the tension detection mechanisms include tension sensors; wherein the fiber conveying mechanisms are used to adjust the fiber conveying speed according to the detection information of the tension sensors to control the fiber tension. According to the tension control system for a continuous fiber prepreg production line provided by this utility model, the plurality of fiber conveying mechanisms include an unwinding mechanism, and the plurality of tension detection mechanisms include a first tension detection mechanism disposed after the unwinding mechanism; the first tension detection mechanism includes a first mounting plate and a first guide wheel, a first tension spring guide wheel and a first tension sensor connected to the first mounting plate, the fiber filament alternately passing over the first guide wheel, the first tension spring guide wheel and the first tension sensor; the unwinding mechanism is used to adjust the fiber unwinding and conveying speed according to the detection information of the first tension sensor to control the fiber tension.

[0006] According to the tension control system for a continuous fiber prepreg production line provided by this utility model, the first tension spring guide wheel includes a guide wheel and a tension spring structure connecting the guide wheel and the first mounting plate.

[0007] According to the tension control system for a continuous fiber prepreg production line provided by this utility model, the first mounting plate has a guide hole at one end near the unwinding mechanism for limiting the passage of the fiber filament.

[0008] According to the tension control system for a continuous fiber prepreg production line provided by this utility model, the first mounting plate is provided with multiple sets of the first guide rollers, the first tension spring guide rollers and the first tension sensor to simultaneously transport multiple fiber filaments.

[0009] According to the tension control system for a continuous fiber prepreg production line provided by this utility model, the production line further includes a filament spreading device located after the first tension detection mechanism; the plurality of fiber conveying mechanisms further include two sets of conveying pressure rollers located in the filament spreading device, and the plurality of tension detection mechanisms further include a cantilever tension sensor located between the two sets of conveying pressure rollers, wherein the fiber filament passes through and around the cantilever tension sensor between the conveying pressure rollers; the conveying pressure rollers are used to adjust the fiber conveying speed according to the detection information of the cantilever tension sensor to control the fiber tension.

[0010] According to the tension control system for a continuous fiber prepreg production line provided by this utility model, the plurality of tension detection mechanisms further include a second tension detection mechanism disposed after the two sets of conveyor pressure roller groups. The second tension detection mechanism includes a second mounting plate and a second guide wheel, a second tension spring guide wheel and a second tension sensor connected to the second mounting plate. The fiber filament alternately passes over the second guide wheel, the second tension spring guide wheel and the second tension sensor. The conveyor pressure roller group is used to adjust the fiber conveying speed according to the detection information of the second tension sensor to control the fiber tension.

[0011] According to the tension control system for a continuous fiber prepreg production line provided by this utility model, the plurality of fiber conveying mechanisms further include a traction device disposed after the second tension detection mechanism, and the plurality of tension detection mechanisms further include a third tension detection mechanism disposed after the traction device. The third tension detection mechanism includes a third mounting plate and a third guide wheel, a third tension spring guide wheel and a third tension sensor connected to the third mounting plate. The fiber filament alternately passes over the third guide wheel, the third tension spring guide wheel and the third tension sensor.

[0012] According to the tension control system for a continuous fiber prepreg production line provided by this utility model, the plurality of fiber conveying mechanisms further include a winding device located after the third tension detection mechanism; the winding device and / or the traction device are used to adjust the fiber winding and conveying speed according to the detection information of the third tension sensor to control the fiber tension.

[0013] According to another aspect of the present invention, a continuous fiber prepreg production line is provided, including the tension control system for the continuous fiber prepreg production line described in any of the above claims.

[0014] Overall, compared with the prior art, the tension control system and production line for continuous fiber prepreg production lines provided by this utility model offer the following advantages: The paper proposes setting up multiple fiber conveying mechanisms and multiple tension detection mechanisms along the production line. This allows for fiber tension detection and adjustment at multiple points along the production line, which helps maintain the stability of fiber tension throughout the entire production line and avoids large fluctuations in tension at different points. This, in turn, helps ensure the quality of the finished product and achieves stable and efficient production of continuous fiber products. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the continuous fiber prepreg production line provided by this utility model.

[0016] Figure 2 This is a schematic diagram of the unwinding mechanism provided by this utility model.

[0017] Figure 3 This is a schematic diagram of the structure of the first tension detection mechanism provided by this utility model.

[0018] Figure 4 This is a schematic diagram of the filament spreading device provided by this utility model.

[0019] Figure 5 This is a schematic diagram of the structure of the second tension detection mechanism provided by this utility model.

[0020] Figure 6 This is a schematic diagram of the traction device provided by this utility model.

[0021] Figure 7 This is a schematic diagram of the structure of the third tension detection mechanism provided by this utility model.

[0022] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1. Unwinding mechanism; 1-1 and 1-2. Air shaft; 1-3 and 1-4. Unwinding servo motor; 1-5 and 1-6. Coupling; 1-7. Unwinding bracket; 1-8 and 1-9. Screw guide rail module; 2. Correction mechanism; 3. First tension detection mechanism; 3-1. First mounting plate; 3-2 and 3-3. Ceramic guide hole; 3-4 and 3-5. First tension spring guide wheel; 3-6 and 3-7. First tension sensor; 4. Glue removal device; 5. Spreading device; 5-1. Spreading mounting plate; 5-2. Equal width positioning groove; 5-3. First convex pin; 5-4. Height and width positioning groove; 5-5. Second convex pin; 5-6 and 5-7. Spreading servo motor; 5-8 and 5-9. Linear bearing; 5-10. Cantilever tension sensor; 5-11 and 5-12. Spreading conveyor servo motor; 5-13 and 5-14. Spreading conveyor pressure roller group; 5-15 and 5-16. High-speed camera; 5-17. Ionizing air bar; 5-18. Winding guide wheel; 6. Solution impregnation device; 7. Drying and preheating device; 8. Melt impregnation device; 9. Core-shell device; 10. Cooling device; 10-1. Second mounting plate; 10-2 and 10-3. Annular air knife; 10-4. Second tension spring guide wheel; 10-5. Second tension sensor; 11. Traction device; 11-1. Traction bracket; 11-2. Traction conveyor pair of pressure rollers; 11-3. Traction servo motor; 11-4. Traction reducer; 11-5. Cylinder; 11-6. Traction guide wheel; 12. Wire diameter detection device; 13. Third tension detection mechanism; 13-1. Third mounting plate; 13-2. Third tension spring guide wheel; 13-3. Third tension sensor; 13-4. Meter counter; 14. Winding device. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] Please see Figure 1This embodiment provides a tension control system for a continuous fiber prepreg production line. The tension control system includes multiple fiber conveying mechanisms and multiple tension detection mechanisms arranged along the production line. The multiple fiber conveying mechanisms and multiple tension detection mechanisms are arranged in a cross pattern. The fiber conveying mechanisms are used to provide fiber conveying power, and the tension detection mechanisms include tension sensors. The fiber conveying mechanisms are used to adjust the fiber conveying speed according to the detection information of the tension sensors to control the fiber tension.

[0025] This embodiment includes multiple fiber conveying mechanisms and multiple tension detection mechanisms along the production line. This allows for fiber tension detection and adjustment at multiple points along the production line, helping to maintain stable fiber tension throughout the entire line and preventing significant tension fluctuations at different locations. This, in turn, helps ensure finished product quality and achieves stable and efficient production of continuous fiber products. Optionally, the fiber conveying mechanism adjusts the fiber conveying speed based on detection information from nearby tension detection mechanisms to regulate fiber tension at those mechanisms.

[0026] In some embodiments, reference Figure 1 and Figure 3 The plurality of fiber conveying mechanisms include an unwinding mechanism 1, and the plurality of tension detection mechanisms include a first tension detection mechanism 3 disposed after the unwinding mechanism 1; the first tension detection mechanism 3 includes a first mounting plate 3-1 and a first guide wheel, a first tension spring guide wheel and a first tension sensor connected to the first mounting plate 3-1, the fiber filaments alternately passing over the first guide wheel, the first tension spring guide wheel and the first tension sensor; the unwinding mechanism 1 is used to adjust the fiber unwinding and conveying speed according to the detection information of the first tension sensor to regulate the fiber tension.

[0027] refer to Figure 2 The unwinding mechanism 1 includes a linear motion structure, an unwinding servo motor, and an air shaft. The air shaft is connected to the unwinding servo motor and is used to wind the fiber filaments. Unwinding is achieved through controllable rotation. The unwinding servo motor is connected to the linear motion structure arranged along the axial direction of the air shaft. The linear motion structure can be a lead screw guide module. Unwinding supports 1-7 can also be provided at the unwinding mechanism 1. Multiple unwinding mechanisms 1 and unwinding supports 1-7 can be provided to achieve combined unwinding and manufacturing of various fiber filaments. (Reference) Figure 2 In this embodiment, two sets of unwinding mechanisms 1 are provided. Specifically, the unwinding servo motor 1-3 is connected to the air shaft 1-1 through the coupling 1-5, and the unwinding servo motor 1-3 is mounted on the lead screw guide module 1-8; the unwinding servo motor 1-4 is connected to the air shaft 1-2 through the coupling 1-6, and the unwinding servo motor 1-4 is mounted on the lead screw guide module 1-9. The lead screw guide module 1-9 can be mounted on a bracket to distinguish it from the fiber filament on the air shaft 1-1 in terms of height.

[0028] A correction mechanism 2 can be provided between the unwinding mechanism 1 and the first tension detection mechanism. The correction mechanism 2 includes a correction bracket, at least one channel on the correction bracket, and a set of grating sensors on the upper and lower sides of the channel. The linear movement structure is used to move according to the detection results of the grating sensors to achieve correction.

[0029] refer to Figure 3 The first tension detection mechanism 3 is used to detect the tension of the fiber after correction and to guide it; the first tension spring guide wheel includes a guide wheel and a tension spring structure connecting the guide wheel and the first mounting plate 3-1. That is, the guide wheel is elastically fixed to the first mounting plate 3-1 by the tension spring structure, so that the guide wheel of the first tension spring guide wheel has a vertical vibration space, thereby alleviating the tension fluctuation of the bypassed fiber by floating up and down.

[0030] The first mounting plate 3-1 has a guide hole at one end near the unwinding mechanism 1 for limiting the passage of fiber filaments. The first mounting plate is equipped with multiple sets of first guide rollers, first tension spring guide rollers, and first tension sensors to simultaneously transport multiple fiber filaments, adapting to composite manufacturing processes involving various fibers.

[0031] refer to Figure 3 When two sets of unwinding mechanisms 1 are provided to transport two kinds of fiber filaments, the two kinds of fiber filaments pass through ceramic guide holes 3-2 and ceramic guide holes 3-3 respectively and alternately pass over the two sets of first tension detection mechanisms. One kind of fiber filament passes over the lower first guide wheel, the first tension spring guide wheel 3-4 and the first tension sensor 3-6, while the other kind of fiber filament passes over the upper first guide wheel, the first tension spring guide wheel 3-5 and the first tension sensor 3-7. The first tension sensor 3-6 and the first tension sensor 3-7 detect the tension values ​​of the two kinds of fiber filaments in real time and feed back the signals to the unwinding servo motor 1-3 and the unwinding servo motor 1-4. The tension is adjusted by controlling the unwinding speed.

[0032] refer to Figure 1 In this embodiment, the production line also includes a fiber spreading device 5 located after the first tension detection mechanism; used to spread the fiber filaments. (See reference...) Figure 4 The plurality of fiber conveying mechanisms further include two sets of conveying pressure rollers, namely, the spreading conveying pressure roller set 5-13 and the spreading conveying pressure roller set 5-14, which are disposed in the spreading device 5; the plurality of tension detection mechanisms further include a cantilever tension sensor disposed between the two sets of conveying pressure rollers, through which the fiber filament passes and around the cantilever tension sensor; the conveying pressure roller set is used to adjust the fiber conveying speed according to the detection information of the cantilever tension sensor to regulate the fiber tension.

[0033] Optionally, the conveyor pair pressure roller group located before the cantilever tension sensor is used to adjust the fiber conveying speed according to the detection information of the cantilever tension sensor to regulate the fiber tension.

[0034] refer to Figure 1 and Figure 5 The plurality of tension detection mechanisms also include a second tension detection mechanism disposed after the two sets of conveying pressure roller groups. The second tension detection mechanism includes a second mounting plate 10-1 and a second guide wheel, a second tension spring guide wheel 10-4 and a second tension sensor 10-5 connected to the second mounting plate 10-1. The fiber filament alternately passes over the second guide wheel, the second tension spring guide wheel 10-4 and the second tension sensor 10-5. The conveying pressure roller group is used to adjust the fiber conveying speed according to the detection information of the second tension sensor 10-5 to regulate the fiber tension.

[0035] Optionally, the conveyor roller assembly located before the second tension detection mechanism is used to adjust the fiber conveying speed according to the detection information of the second tension sensor 10-5 to regulate the fiber tension.

[0036] refer to Figure 1 and Figure 6 The plurality of fiber conveying mechanisms also include a traction device 11 disposed after the second tension detection mechanism for providing traction power for the fiber conveying movement. (See reference) Figure 7 The plurality of tension detection mechanisms also include a third tension detection mechanism 13 located after the traction device 11. The third tension detection mechanism 13 includes a third mounting plate 13-1 and a third guide wheel, a third tension spring guide wheel 13-2 and a third tension sensor 13-3 connected to the third mounting plate. The fiber filament alternately passes over the third guide wheel, the third tension spring guide wheel 13-2 and the third tension sensor 13-3.

[0037] refer to Figure 1 The plurality of fiber conveying mechanisms further include a winding device 14 located after the third tension detection mechanism 13, for winding the prepared fiber filaments; the winding device 14 and / or the traction device 11 are used to adjust the fiber winding and conveying speed according to the detection information of the third tension sensor 13-3 to regulate the fiber tension. Optionally, the winding device 14 is used to adjust the fiber winding and conveying speed according to the detection information of the third tension sensor 13-3 to regulate the fiber tension.

[0038] In other embodiments, a continuous fiber prepreg production line is also provided, the production line including the tension control system of any of the above-described continuous fiber prepreg production lines.

[0039] refer to Figure 1A degumming device can also be installed between the fiber spreading device and the first tension detection mechanism in the production line. The fiber spreading device 5 is used to detect defects in the fiber filaments and spread them. The fiber spreading device 5 includes a fiber spreading mounting plate 5-1, an equal-width positioning groove 5-2, a first convex pin 5-3, a height-width positioning groove 5-4, and a second convex pin 5-5. The fiber filaments are passively spread through the positioning groove and the convex pin. The fiber spreading servo motors 5-6 and 5-7 control the linear bearings 5-8 and 5-9 to move laterally for active mechanical spreading. The rotation of the motors can be converted into linear reciprocating movement through a cam connector.

[0040] A cantilever tension sensor 5-10 detects the tension value during the fiber spreading process. Spreading conveyor servo motors 5-11 and 5-12 control the spreading conveyor pressure roller group 5-13 and 5-14 for guiding and traction. A high-speed camera 5-15 detects the surface quality of the raw fiber, and a high-speed camera 5-16 detects the surface quality of the fiber after spreading. An ion bar 5-17 eliminates static electricity accumulation caused by mechanical friction, and a winding guide wheel 5-18 winds the fiber and filament. The spreading device 5, through a combination of passive and mechanical spreading, maintains constant tension, addressing the material's tendency to bend and break easily. Furthermore, it allows for multi-purpose use by simply changing parts for different fiber specifications. Front and rear cameras provide precise online monitoring, and the static elimination device further ensures surface quality.

[0041] The adhesive removal device 4 includes an adhesive removal chamber and a heating tube inside the chamber for heating and removing adhesive from the passing fiber filaments. Following the fiber spreading device 5, the device sequentially includes a solution impregnation device 6, a drying and preheating device 7, a melt impregnation device 8, a core-shell device 9, and a cooling device 10. The solution impregnation device 6 stores a resin solution for impregnating the passing fiber filaments. The drying and preheating device 7 includes a drying chamber and a heating tube inside the chamber for drying and preheating the passing fiber filaments. The melt impregnation device 8 impregnates the passing fiber filaments with molten resin. The core-shell device 9 encapsulates the outer surface of the melt-impregnated fiber filaments with resin.

[0042] The cooling device 10 is used to rapidly cool and shape the pre-impregnated filament. The cooling device 10 can be mounted on the second mounting plate 10-1 and includes annular air knives 10-2 and 10-3. The core-shell device 9 can be mounted on the second mounting plate 10-1 and located between the annular air knives 10-2 and 10-3. The second tension spring guide wheel 10-4 eliminates tension fluctuations during the pre-impregnation process, and the second tension sensor 10-5 detects the tension value of the pre-impregnated filament. The design of the double-sided annular air knives can quickly achieve rapid cooling of the pre-impregnated filament, prevent thermal stress concentration, and ensure surface quality.

[0043] Following the cooling device 10, a traction device 11, a wire diameter detection device 12, a third tension detection mechanism 13, and a winding device 14 can be sequentially installed. The traction device 11 is used to traction the pre-impregnated filaments. The traction device 11 includes a support 11-1, a traction conveyor roller group 11-2, a traction servo motor 11-3, a traction reducer 11-4, a cylinder 11-5, and a traction guide wheel 11-6. The traction reducer 11-4 is connected to the traction servo motor 11-3. The traction servo motor 11-3 is connected to one of the conveyor rollers in the traction conveyor roller group 11-2 via a transmission structure to drive the conveyor roller to rotate. The cylinder 11-5 is connected to the other conveyor roller in the traction conveyor roller group 11-2 to drive the conveyor roller to move up and down to adjust the compression of the fiber filaments. The traction guide wheel 11-6 is connected to the support 11-1 and is used to bypass the fiber filaments for fiber transport.

[0044] The wire diameter detection device 12 is used to measure the diameter of the pre-impregnated filament or the width and thickness of the narrow strip. The third tension detection mechanism 13 is used for tension detection of the pre-impregnated filament; the third tension detection mechanism 13 includes a third mounting plate 13-1, a third tension spring guide wheel 13-2 to alleviate tension fluctuations, and a third tension sensor 13-3 to detect the tension value; a meter counter 13-4 is also provided at the rear end of the third mounting plate 13-1 of the third tension detection mechanism 13 for measuring the length of the pre-impregnated filament. The winding device 14 is used to wind and arrange the formed pre-impregnated filament. The entire production line is divided into four tension zones, with the traction device acting as the main traction speed regulator to adjust the speed at different positions and maintain tension stability.

[0045] The implementation method of this solution is as follows: Five sets of motors control four tension levels. The first level is the tension between the unwinding motor and the spreading motor, which is identified by a tension sensor and the speed of the unwinding motor is adjusted accordingly. The second level is the tension between the spreading motors, and tension fluctuations are controlled by adjusting the speed of the spreading motor. The third level is the tension between the spreading motor and the traction motor, and tension fluctuations are controlled by adjusting the speed of the spreading motor. The fourth level is the tension between the traction motor and the take-up motor, and the speed of the take-up motor is adjusted to maintain constant tension. The entire production line uses the traction motor as the speed reference and adjusts the motors of different mechanisms to maintain constant tension in different levels.

[0046] Control effect: By using the motor of the traction device as the speed reference and performing gradient tension control on the unwinding device, the fiber can maintain constant tension under different processes. At the same time, the speed error caused by the motor response is compensated for by the floating tension spring device to maintain constant tension.

[0047] The tension control system provided in this embodiment decouples the tension of multiple segments of the production line to achieve stable tension throughout the entire production line. At the same time, the reasonable layout of the tension sensors is conducive to effectively correcting factors such as roller friction fluctuations and resistance changes during the impregnation / drying process, thereby achieving highly stable and consistent multi-segment tension precision control.

[0048] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tension control system for a continuous fiber prepreg production line, characterized in that, It includes multiple fiber conveying mechanisms and multiple tension detection mechanisms arranged along the production line, with the multiple fiber conveying mechanisms and multiple tension detection mechanisms arranged in a cross pattern. The fiber conveying mechanisms are used to provide fiber conveying power, and the tension detection mechanisms include tension sensors. The fiber conveying mechanisms are used to adjust the fiber conveying speed according to the detection information of the tension sensors to regulate fiber tension.

2. The tension control system for a continuous fiber prepreg production line as described in claim 1, characterized in that, The plurality of fiber conveying mechanisms include an unwinding mechanism, and the plurality of tension detection mechanisms include a first tension detection mechanism disposed after the unwinding mechanism; the first tension detection mechanism includes a first mounting plate and a first guide wheel, a first tension spring guide wheel and a first tension sensor connected to the first mounting plate, the fiber filaments alternately passing over the first guide wheel, the first tension spring guide wheel and the first tension sensor; The unwinding mechanism is used to adjust the fiber unwinding and conveying speed according to the detection information of the first tension sensor in order to regulate the fiber tension.

3. The tension control system for a continuous fiber prepreg production line as described in claim 2, characterized in that, The first tension spring guide wheel includes a guide wheel and a tension spring structure connecting the guide wheel and the first mounting plate.

4. The tension control system for a continuous fiber prepreg production line as described in claim 2, characterized in that, The first mounting plate has a guide hole at one end near the unwinding mechanism for limiting the passage of the fiber filament.

5. The tension control system for a continuous fiber prepreg production line as described in claim 2, characterized in that, The first mounting plate is provided with multiple sets of the first guide rollers, the first tension spring guide rollers and the first tension sensor to simultaneously transport multiple fiber filaments.

6. The tension control system for a continuous fiber prepreg production line as described in any one of claims 2-5, characterized in that, The production line also includes a fiber spreading device located after the first tension detection mechanism; the plurality of fiber conveying mechanisms also include two sets of conveying pressure rollers located in the fiber spreading device, and the plurality of tension detection mechanisms also include a cantilever tension sensor located between the two sets of conveying pressure rollers, through which the fiber filament passes and around the cantilever tension sensor; the conveying pressure rollers are used to adjust the fiber conveying speed according to the detection information of the cantilever tension sensor to regulate the fiber tension.

7. The tension control system for a continuous fiber prepreg production line as described in claim 6, characterized in that, The plurality of tension detection mechanisms also include a second tension detection mechanism disposed after the two sets of conveyor roller groups. The second tension detection mechanism includes a second mounting plate and a second guide wheel, a second tension spring guide wheel and a second tension sensor connected to the second mounting plate. The fiber filament alternately passes over the second guide wheel, the second tension spring guide wheel and the second tension sensor. The conveyor roller groups are used to adjust the fiber conveying speed according to the detection information of the second tension sensor to regulate the fiber tension.

8. The tension control system for a continuous fiber prepreg production line as described in claim 7, characterized in that, The plurality of fiber conveying mechanisms further include a traction device disposed after the second tension detection mechanism, and the plurality of tension detection mechanisms further include a third tension detection mechanism disposed after the traction device. The third tension detection mechanism includes a third mounting plate and a third guide wheel, a third tension spring guide wheel and a third tension sensor connected to the third mounting plate. The fiber filaments alternately pass over the third guide wheel, the third tension spring guide wheel and the third tension sensor.

9. The tension control system for a continuous fiber prepreg production line as described in claim 8, characterized in that, The plurality of fiber conveying mechanisms also include a winding device located after the third tension detection mechanism; the winding device and / or the traction device are used to adjust the fiber winding and conveying speed according to the detection information of the third tension sensor to regulate the fiber tension.

10. A continuous fiber prepreg production line, characterized in that, The tension control system for a continuous fiber prepreg production line, as described in any one of claims 1-9.

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