Carbon fiber multifilament pultrusion production line and preparation method of carbon fiber detection sample strip

Abstract

The invention relates to the technical field of carbon fiber manufacturing, in particular to a carbon fiber multifilament pultrusion production line and a production method. The gum dipping device, the primary heating and curing device, the secondary heating and curing device, the traction feeding machine, the cutting machine and the sample strip conveying machine are sequentially arranged on the machine table in the advancing direction of the carbon fiber multifilament. The unwinding machine bears the carbon fiber original roll and releases the carbon fiber bundle; the impregnation device infiltrates the carbon fiber bundles into the glue solution; the primary heating and curing device and the secondary heating and curing device are used for curing the carbon fiber bundles step by step; the traction feeding machine conveys the cured carbon fiber bundles to the cutting machine; the cutting machine performs fixed-length cutting to form a carbon fiber detection sample strip, and the carbon fiber detection sample strip is output by the sample strip conveying machine. Thus, automatic production of the carbon fiber detection sample strips is achieved, it is guaranteed that the tension, straightness and curing quality of all the carbon fiber detection sample strips are consistent, the sample preparation efficiency and quality stability are improved, and then reliable support is provided for carbon fiber multifilament quality judgment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon fiber manufacturing, and particularly relates to a carbon fiber multifilament pultrusion production line and a carbon fiber detection sample preparation method. BACKGROUND

[0002] The tensile property of the carbon fiber multifilament is a core index for judging the quality of the carbon fiber multifilament, and directly determines the application adaptability of the carbon fiber multifilament in high-end equipment, aerospace and other fields. The preparation quality and efficiency of the carbon fiber mechanical property detection sample directly affect the accuracy of the tensile property test result and the advancing speed of the test process. Therefore, the preparation technology of the carbon fiber mechanical property detection sample becomes a key link in the quality control system of the carbon fiber multifilament.

[0003] In terms of the current industry status, the preparation of the carbon fiber mechanical property detection sample mainly relies on the manual cooperation with the specific tooling, and the typical preparation process is "winding into a bundle-manual impregnation-resting and curing". The winding positioning of the carbon fiber bundle, the impregnation of the glue and the state monitoring in the curing process are all manually completed by the operator. However, the manual sample preparation method has the following problems: 1) high labor cost and low efficiency. A large number of operators are needed to perform repetitive manual operations, and the curing process of a single sample preparation takes a long time, which cannot meet the demand for rapid sample supply for batch detection; 2) poor sample quality stability. The tension of each carbon fiber bundle cannot be accurately controlled during the manual winding process, and the sample after curing is prone to problems such as straightness deviation and uneven local glue impregnation, which leads to inconsistent mechanical property test standards of different batches or even the same batch, and affects the reliability of the test result; 3) the operation standardization depends on the experience of the operator, and the winding force and impregnation amount controlled by different operators have large differences, which further aggravates the fluctuation of the sample quality.

[0004] Therefore, it is urgent for technical personnel to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a carbon fiber multifilament pultrusion production line, which aims to solve the problems of high labor cost, low efficiency, and difficulty in ensuring the consistency of the sample tension and straightness in the manual sample preparation with tooling in the prior art, and further leads to unstable quality of the carbon fiber mechanical property detection sample and cannot meet the batch standardized sample preparation.

[0006] The present application relates to a carbon fiber multifilament pultrusion production line, wherein a unwinding machine, an impregnation device, a primary heating and curing device, a secondary heating and curing device, a traction feeding machine, a cutting machine and a sample conveying machine are sequentially arranged on a machine table along the running direction of the carbon fiber multifilament. The unwinding machine is used for carrying a carbon fiber original roll and releasing a carbon fiber bundle. The impregnation device is used for impregnating the carbon fiber bundle with glue. The primary heating and curing device is used for primary curing of the impregnated carbon fiber bundle; The secondary heating and curing device is used for complete curing of the primary cured carbon fiber bundle; The traction feeding machine is used for conveying the completely cured carbon fiber bundle to the cutting machine; The cutting machine is used for length cutting of the completely cured carbon fiber bundle; The spline conveying machine is used for conveying the carbon fiber test spline cut by the cutting machine.

[0007] As a further improvement of the disclosed technical solution, the unwinding machine comprises a yarn unwinding device and a tension adjusting device; the yarn unwinding device is used for supporting and positioning the carbon fiber original roll, and during the release of the carbon fiber bundle, it rotates synchronously with the carbon fiber original roll following the release action of the carbon fiber bundle; the tension adjusting device is linked with the yarn unwinding device, and is used for real-time detection of the tension state of the carbon fiber bundle during the release of the carbon fiber bundle, and adjusting the tension of the carbon fiber bundle according to the detected tension state.

[0008] As a further improvement of the disclosed technical solution, the yarn unwinding device comprises a hand sliding table, a machine base, a hand expansion shaft and a magnetic powder brake; the hand sliding table is used to carry the machine base, and is installed based on the machine table; the machine base is used to fixedly install the magnetic powder brake; the magnetic powder brake loads the hand expansion shaft, and forms a transmission cooperation with the hand expansion shaft.

[0009] As a further improvement of the disclosed technical solution, the tension adjusting device comprises an installation plate, an upstream yarn guide wheel, a tension detection wheel and a downstream yarn guide wheel; the installation plate is installed based on the machine table, and at the same time provides installation support for the upstream yarn guide wheel, the tension detection wheel and the downstream yarn guide wheel; the carbon fiber bundle is wound through the upstream yarn guide wheel, the tension detection wheel and the downstream yarn guide wheel in sequence, forming a preset running direction; the tension detection wheel is used for detecting the tension state of the carbon fiber bundle during the release of the carbon fiber bundle, and feeding the tension signal to the magnetic powder brake, so that the rotation resistance of the hand expansion shaft can be adjusted.

[0010] As a further improvement of the disclosed technical solution, the primary heating and curing device comprises a base, a heating mold, a position adjusting assembly and a pressure locking assembly; the base is installed based on the machine table; the heating mold is placed on the base, and a yarn passing channel is formed on the heating mold; the position adjusting assembly is used to drive the heating mold to move along the direction close to or away from the carbon fiber yarn conveying path, and the pressure locking assembly is used to apply downward pressure to the adjusted heating mold and lock the position, and both of them are installed based on the base.

[0011] As a further improvement of the disclosed technical solution, the position adjusting assembly is composed of an upstream front position adjusting subassembly, an upstream rear position adjusting subassembly, a downstream front position adjusting subassembly and a downstream rear position adjusting subassembly; the upstream front position adjusting subassembly, the upstream rear position adjusting subassembly, the downstream front position adjusting subassembly and the downstream rear position adjusting subassembly are in fixed fitting relationship with the base; along the direction perpendicular to the carbon fiber filament conveying path, the upstream front position adjusting subassembly and the upstream rear position adjusting subassembly are in opposite distribution, and the two are coordinated to exert force on the upstream sidewall of the heating mold; along the direction perpendicular to the carbon fiber filament conveying path, the downstream front position adjusting subassembly and the downstream rear position adjusting subassembly are in opposite distribution, and the two are coordinated to exert force on the downstream sidewall of the heating mold.

[0012] As a further improvement of the disclosed technical solution, the traction feeding machine comprises a force bearing frame, an upper traction roller assembly and a lower traction roller assembly; the force bearing frame is installed on the machine table and provides installation support for the upper traction roller assembly; the lower traction roller assembly is installed on the machine table and is arranged opposite to the upper traction roller assembly to form a traction channel for the completely cured carbon fiber bundle.

[0013] As a further improvement of the disclosed technical solution, the cutting machine comprises a fixed blade, a moving blade, a blade seat, a guide assembly and a power unit; the fixed blade, the blade seat, the guide assembly and the power unit are installed on the force bearing frame; the fixed blade is arranged on the feeding path of the carbon fiber multifilament; the moving blade is fixedly installed on the blade seat; the power unit is in transmission connection with the blade seat, and under the auxiliary action of the guide assembly, drives the blade seat to reciprocate along the preset direction, and the moving blade and the fixed blade are coordinated to cut the carbon fiber multifilament on the feeding path into segments.

[0014] As a further improvement of the disclosed technical solution, the spline conveying machine comprises a conveying driving unit, a V-shaped wheel conveying assembly and a baffle assembly; the driving unit and the V-shaped wheel conveying assembly are installed on the force bearing frame, and the conveying driving unit and the V-shaped wheel conveying assembly are linked; the V-shaped wheel conveying assembly is used for receiving the cut carbon fiber detection spline, and the baffle assembly is used for limiting the limit conveying position of the carbon fiber detection spline.

[0015] Furthermore, the application also discloses a carbon fiber detection spline preparation method, which is realized by means of the above-mentioned carbon fiber multifilament pultrusion production line and comprises the following steps: S1, the unwinding machine bears a carbon fiber original roll and releases a carbon fiber bundle; S2, the glue dipping device dips the released carbon fiber bundle in glue solution; S3, the primary heating and curing device preliminarily cures the carbon fiber bundle after dipping in glue, and then the secondary heating and curing device completely cures the preliminarily cured carbon fiber bundle; S4, the traction feeding machine transports the completely solidified carbon fiber bundle to the cutting machine; S5, the cutting machine cuts the carbon fiber bundle to a fixed length to form a carbon fiber test sample; S6, the sample conveying machine conveys the cut carbon fiber test sample to a designated position.

[0016] In practical application, the carbon fiber multifilament pultrusion production line disclosed by the application can at least achieve the following beneficial technical effects, specifically: 1) The automatic production line replaces the traditional manual sample preparation, ensuring the consistency of the quality of the carbon fiber test sample from the source. The release tension of the carbon fiber bundle is stably controlled by the unwinding machine to avoid uneven tension caused by manual winding. The glue impregnation device ensures uniform impregnation of each carbon fiber bundle through a standardized impregnation process. The primary and secondary heating and curing devices are cured in steps, accurately controlling the curing process parameters, reducing sample straightness deviation and local insufficient curing caused by manual operation, and finally realizing the unification of the mechanical property test reference of each sample, providing reliable sample support for carbon fiber multifilament quality evaluation; 2) The continuous pultrusion process greatly shortens the sample preparation period, i.e. realizes the full-process automation of "unwinding-gluing-curing-cutting-conveying", without the need for a large number of manpower investment, significantly reducing labor costs and operation intensity. The traction feeding machine accurately transports the cured carbon fiber bundle, and the sample conveying machine automatically sends the cut sample to the designated position, reducing the manual transfer link, further improving the overall production efficiency, and meeting the demand for fast and stable supply of samples for batch testing. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0018] Figure 1 is a perspective view of the carbon fiber multifilament pultrusion production line disclosed by the application.

[0019] Figure 2 is a perspective view of the unwinding machine in the carbon fiber multifilament pultrusion production line disclosed by the application.

[0020] Figure 3 is a perspective view of the primary heating and curing device in the carbon fiber multifilament pultrusion production line disclosed by the application.

[0021] Figure 4is another perspective view of the disclosed carbon fiber multifilament pultrusion production line once heating and curing device.

[0022] Figure 5 is a perspective view of the disclosed carbon fiber multifilament pultrusion production line traction feeding machine.

[0023] Figure 6 is a perspective view of the disclosed carbon fiber multifilament pultrusion production line cutting machine one perspective view.

[0024] Figure 7 is a perspective view of the disclosed carbon fiber multifilament pultrusion production line cutting machine another perspective view.

[0025] Figure 8 is a perspective view of the disclosed carbon fiber multifilament pultrusion production line cutting machine another perspective view.

[0026] Figure 9 is a perspective view of the disclosed carbon fiber multifilament pultrusion production line power part one perspective view (movable knife, knife seat and guide assembly are shown in double-dot dash line form).

[0027] Figure 10 is a perspective view of the disclosed carbon fiber multifilament pultrusion production line power part another perspective view (movable knife, knife seat and guide assembly are shown in double-dot dash line form).

[0028] Figure 11 is a front view of Figure 9 .

[0029] Figure 12 is an A-A sectional view of Figure 11 .

[0030] Figure 13 is a perspective view of the disclosed carbon fiber multifilament pultrusion production line spline conveying machine one perspective view.

[0031] Figure 14 is a perspective view of the disclosed carbon fiber multifilament pultrusion production line spline conveying machine another perspective view.

[0032] 1-machine; 2-unwinding machine; 21-yarn unwinding device; 211-hand sliding table; 212-machine base; 213-hand winding shaft; 214-magnetic powder brake; 22-tension adjustment device; 221-mounting plate; 222-upstream godet; 223-tension detection wheel; 224-downstream godet; 3-dip coating device; 4-primary heating and curing device; 41-base; 42-heating mold; 421-thread passing channel; 43-position adjustment assembly; 431-upstream front position adjustment subassembly; 432-upstream rear position adjustment subassembly; 433-downstream front position adjustment subassembly; 434-downstream rear position adjustment subassembly; 44-pressure locking assembly; 441-upstream pressure locking subassembly; 442-downstream pressure locking subassembly; 5-secondary heating and curing device; 6-drawing feeding machine; 61-bearing frame; 62-upstream drawing roller assembly; 63-downstream drawing roller assembly; 7-cutting machine; 71-fixed knife; 72-moving knife; 73-knife base; 74-guide assembly; 741-guide sliding rail; 742-guide sliding block; 75-power unit; 751-reduction motor; 752-coupling; 753-transmission shaft; 754-bearing seat; 755-eccentric wheel; 756-force transmission member; 757-resetting assembly; 7571-first spring; 7572-second spring; 76-static electricity removing nozzle; 8-spline conveying machine; 81-conveying drive unit; 82-V-shaped wheel conveying assembly; 83-baffle assembly. DETAILED DESCRIPTION

[0033] The present application will be further described in detail below with reference to specific embodiments. Figure 1 A perspective view of the disclosed carbon fiber multifilament pultrusion production line is shown, which mainly consists of a machine 1, an unwinding machine 2, a dip coating device 3, a primary heating and curing device 4, a secondary heating and curing device 5, a drawing feeding machine 6, a cutting machine 7, and a spline conveying machine 8. Among them, the unwinding machine 2, the dip coating device 3, the primary heating and curing device 4, the secondary heating and curing device 5, the drawing feeding machine 6, the cutting machine 7, and the spline conveying machine 8 are arranged in sequence along the direction of the carbon fiber multifilament to cooperatively realize the unwinding, dip coating, preliminary curing, complete curing, drawing conveying, fixed-length cutting, and spline conveying of the carbon fiber multifilament, and are all fixed based on the machine 1. In this way, the precise connection of the unwinding, dip coating, curing, drawing, cutting, and conveying processes is effectively ensured, which lays a good foundation for the efficient preparation of the carbon fiber test spline, simultaneously realizes the full-process automation of “unwinding-dip coating-curing-cutting-conveying”, does not require a large amount of manpower, significantly reduces the labor cost and operation strength, and greatly shortens the sample preparation period. As Figure 2As shown in the drawings, the unwinding machine 2 mainly consists of two parts, i.e., a yarn releasing device 21 and a tension adjusting device 22. The yarn releasing device 21 is used to support and position the carbon fiber raw roll, and during the release of the carbon fiber bundle, it rotates synchronously with the carbon fiber raw roll to provide a stable fiber source for the subsequent process. The tension adjusting device 22 is linked with the yarn releasing device 21, and is used to detect the tension state in real time during the release of the carbon fiber bundle, and adjust the tension of the carbon fiber bundle according to the detected tension state, so as to avoid the influence of tension fluctuation on the subsequent impregnation and curing quality, and to avoid the uneven tension problem caused by manual winding from the source, thereby ensuring the quality consistency of the carbon fiber test sample. As Figure 2 As shown in the drawings, the yarn releasing device 21 includes a hand sliding table 211, a machine base 212, a hand expansion shaft 213, and a magnetic powder brake 214. The hand sliding table 211 is used to carry the machine base 212, and is installed based on the machine table 1. In actual application, the position of the machine base 212 can be adjusted by rotating the hand wheel, so as to conveniently adapt to carbon fiber raw rolls of different specifications; the machine base 212 is used to fixedly install the magnetic powder brake 214; the magnetic powder brake 214 loads the hand expansion shaft 213, and forms a transmission cooperation with the hand expansion shaft 213. By adjusting the braking force of the magnetic powder brake 214, the rotation speed of the hand expansion shaft 213 can be controlled, and then the release rate and the tension basic value of the carbon fiber bundle can be adjusted, so as to realize the dynamic balance of tension in cooperation with the tension adjusting device 22, and to avoid the breakage of the fiber due to excessive tension or the relaxation winding due to insufficient tension. As Figure 2 As shown in the drawings, the tension adjusting device 22 includes an installation plate 221, an upstream guide wheel 222, a tension detection wheel 223, and a downstream guide wheel 224. The installation plate 221 is installed based on the machine table 1, and simultaneously provides installation support for the upstream guide wheel 222, the tension detection wheel 223, and the downstream guide wheel 224; the carbon fiber bundle passes through the upstream guide wheel 222, the tension detection wheel 223, and the downstream guide wheel 224 in sequence, and forms a preset running direction, so as to uniformly transmit the fiber tension to the tension detection wheel 223. The tension detection wheel 223 is internally provided with a tension sensor, which is used to detect the tension state in real time during the release of the carbon fiber bundle, and feedback the tension signal to the magnetic powder brake 214. The magnetic powder brake 214 adjusts the braking force according to the feedback signal, and then changes the rotation resistance of the hand expansion shaft 213, so as to realize the dynamic balance adjustment of the carbon fiber bundle tension, provide the fiber with stable tension for the subsequent impregnation process, and ensure the uniformity of liquid impregnation. The impregnation device 3 is internally provided with a glue storage cavity, a guide roller assembly, an impregnation pressure roller assembly, and an extrusion roller assembly (not shown in the figure). The glue storage cavity is used to store impregnation glue, the guide roller assembly guides the carbon fiber bundle to enter the glue storage cavity smoothly, the impregnation pressure roller assembly fully presses the fiber bundle into the glue, ensuring that each carbon fiber can uniformly absorb the glue; the extrusion roller assembly is used to preliminarily remove the excess glue on the surface of the fiber bundle, laying a good foundation for the subsequent curing process, avoiding local defects in the sample after curing due to uneven glue distribution, ensuring uniform glue impregnation of each carbon fiber bundle through a standardized impregnation process, and further ensuring the quality consistency of the carbon fiber test sample. As shown in Figure 3 、 Figure 4 , the one-time heating and curing device 4 mainly consists of a base 41, a heating mold 42, a position adjustment assembly 43, and a pressure locking assembly 44. Among them, the base 41 is installed on the machine table 1; the heating mold 42 is placed on the base 41, and a fiber passing channel 421 is provided on the heating mold 42 for the carbon fiber bundle to pass through; the heating mold 42 is internally provided with a heating element, which can realize low-temperature constant temperature control of 50-80℃, providing a preliminary curing environment for the fiber bundle and making the glue preliminary set; the position adjustment assembly 43 and the pressure locking assembly 44 are both installed on the base 41. The position adjustment assembly 43 is used to drive the heating mold 42 to move along the direction close to or away from the carbon fiber fiber conveying path, so as to adapt to different specifications of the carbon fiber bundle, without the need to stop the machine to replace the mold to complete the processing of the fiber bundle of different specifications, improving the applicability and production efficiency of the equipment; the pressure locking assembly 44 is used to apply downward pressure to the heating mold 42 adjusted in place, and realize position locking, avoiding the heating mold 42 from deviating due to vibration or friction force of the fiber bundle during work, maintaining the relative position stability of the heating mold and the conveying path, avoiding secondary friction damage of the fiber bundle due to dynamic deviation, and ensuring the straightness of the sample. Similarly as Figure 3 、 Figure 4As shown in the figure, the position adjusting assembly 43 is composed of an upstream front position adjusting subassembly 431, an upstream rear position adjusting subassembly 432, a downstream front position adjusting subassembly 433, and a downstream rear position adjusting subassembly 434. The upstream front position adjusting subassembly 431, the upstream rear position adjusting subassembly 432, the downstream front position adjusting subassembly 433, and the downstream rear position adjusting subassembly 434 are in fixed matching relationship with the base 41, ensuring stability during adjustment. Along the direction perpendicular to the carbon fiber filament conveying path, the upstream front position adjusting subassembly 431 and the upstream rear position adjusting subassembly 432 are in opposite distribution, and the two are coordinated to exert force on the upstream side wall of the heating mold 42, realizing position adjustment of the upstream end of the heating mold 42; along the direction perpendicular to the carbon fiber filament conveying path, the downstream front position adjusting subassembly 433 and the downstream rear position adjusting subassembly 434 are in opposite distribution, and the two are coordinated to exert force on the downstream side wall of the heating mold 42, realizing position adjustment of the downstream end of the heating mold 42. Through the coordinated action of the upstream front position adjusting subassembly 431, the upstream rear position adjusting subassembly 432, the downstream front position adjusting subassembly 433, and the downstream rear position adjusting subassembly 434, the position adjustment and accurate positioning of the heating mold 42 on the horizontal plane can be realized, the requirements of different rigidities and different cross-sectional sizes of carbon fiber bundles for threading can be met, the frictional damage of the filament to the inner wall of the threading channel 421 is reduced, and the filament is provided in a stable form for subsequent complete solidification. As Figure 1 As shown in the figure, the secondary heating and solidification device 5 adopts a high-temperature oven structure. The oven is provided with multiple groups of heating pipes and hot air circulating fans, which can realize high-temperature constant temperature control of 120-150℃, and the temperature uniformity error is controlled within ±3℃; the inlet and outlet of the oven are provided with high-temperature resistant sealing curtains, which can effectively reduce heat loss and maintain stable temperature in the oven; after the carbon fiber bundle is preliminarily solidified, it is put into the oven to realize complete solidification of the glue liquid in a high-temperature environment, forming a stable carbon fiber multifilament structure, providing a solid foundation for subsequent cutting processing. The primary heating and solidification device 4 and the secondary heating and solidification device 5 are solidified step by step, the solidification temperature and time parameters are accurately controlled, the problems such as sample straightness deviation and local insufficient solidification caused by manual operation are reduced, the mechanical property detection benchmark of each sample is unified, and reliable sample support is provided for carbon fiber multifilament quality judgment. As Figure 5As shown, the traction feeding machine 6, as a key piece of equipment connecting the curing and cutting processes, mainly consists of a support frame 61, an upper traction roller assembly 62, and a lower traction roller assembly 63. The support frame 61 uses the machine base 1 as its mounting foundation and provides support for the upper traction roller assembly 62. The lower traction roller assembly 63 uses the machine base 1 as its mounting foundation and is positioned opposite to the upper traction roller assembly 62, working together to form a traction channel for the fully cured carbon fiber bundles to pass through. During operation, the upper traction roller assembly 62 and the lower traction roller assembly 63 rotate synchronously in opposite directions, using friction to smoothly convey the carbon fiber bundles forward. The conveying speed can be adjusted according to cutting requirements, ensuring that the carbon fiber bundles enter the cutting machine 7 at a constant speed, guaranteeing fixed-length cutting, and accurately conveying the cured carbon fiber bundles, reducing manual intervention and improving overall production efficiency. like Figures 6-8 As shown, the cutting machine 7 mainly consists of several parts, including a fixed blade 71, a moving blade 72, a blade holder 73, a guide assembly 74, and a power unit 75. The fixed blade 71, blade holder 73, guide assembly 74, and power unit 75 are all mounted on a support frame 61 to ensure that the positions of each component are relatively fixed. The fixed blade 71 is positioned on the feeding path of the carbon fiber multifilament and is fixed with bolts, forming a cutting benchmark. The moving blade 72 is fixedly mounted on the blade holder 73, and the moving blade 72 is adapted to the fixed blade 71 to achieve precise cutting. The power unit 75 is connected to the blade holder 73 and, with the assistance of the guide assembly 74, drives the blade holder 73 to reciprocate along a preset direction (perpendicular to the carbon fiber multifilament feeding direction). The moving blade 72 and the fixed blade 71 work together to cut the carbon fiber multifilament on the feeding path into segments. The cutting length can be precisely controlled by controlling the conveying distance of the traction feeding machine 6 and the operating frequency of the power unit 75, ensuring the consistency of the length of each test strip and improving the reliability of the test data. As described above, the guide assembly 74 plays a crucial role in constraining the movement trajectory of the tool holder 73. It is composed of two sets of parallel guide rails 741 and guide sliders 742. Figure 7 , 8 (As shown in the diagram). The guide rail 741 is arranged along the preset reciprocating motion direction of the cutter holder 73 and is fixed to the support frame 61 to form a stable guiding reference. The guide slider 742 corresponds one-to-one with the guide rail 741 and is in clearance sliding fit, while the guide slider 742 is fixed to the cutter holder 73. In practical applications, the precise cooperation between the guide rail 741 and the guide slider 742 effectively limits the movement direction of the cutter holder 73, preventing the cutter holder 73 from deviating or shaking during reciprocating motion, ensuring that the moving cutter 72 and the fixed cutter 71 always maintain precise alignment, further improving cutting accuracy, avoiding rough cross-section phenomena, and meeting the stringent requirements of mechanical test strips for cross-section quality. like Figures 9-12As shown in the middle, the power part 75 as the driving power source of the knife seat 73, composed of several parts such as reduction motor 751, shaft coupling 752, transmission shaft 753, bearing seat 754, eccentric wheel 755, force transmission 756 and reset assembly 757. Among them, the output shaft of the reduction motor 751 is connected with the transmission shaft 753 through the shaft coupling 752, which realizes the efficient transmission of power; the bearing seat 754 is fixedly installed on the force bearing frame 61, which provides stable support for the transmission shaft 753; the transmission shaft 753 penetrates the inner hole of the bearing seat 754 and rotates with the inner bearing, and is fixedly connected with the shaft position of the eccentric wheel 755, which ensures the synchronous rotation of the eccentric wheel 755 with the transmission shaft 753; one end of the force transmission 756 is in contact with the outer circumferential surface of the eccentric wheel 755, and the other end is fixedly connected with the side wall of the knife seat 73, and the contact end of the force transmission 756 is provided with an arc stress surface matched with the curvature radius of the outer circumferential surface of the eccentric wheel 755, so as to increase the contact area of force transmission and ensure the stable transmission of thrust; the reset assembly 757 is connected with the knife seat 73, and the reset assembly 757 includes first spring 7571 and second spring 7572, which are symmetrically arranged on the upper and lower sides of the knife seat 73, and are used to provide reset power for the knife seat 73 during the rotation of the eccentric wheel 755. When the reduction motor 751 works, the eccentric wheel 755 rotates synchronously with the transmission shaft 753, and the eccentric wheel 755 pushes the force transmission 756 in the rotation process, while the reverse reset action of the reset assembly 757 is assisted, which drives the knife seat 73 to reciprocate along the preset direction, finally realizes the continuous cutting action, improves the cutting efficiency, and meets the demand of batch detection for sample strip fast supply. The cutting machine 7 is also provided with an electrostatic nozzle 76 (as shown in the middle). Figure 7 、 Figure 8 The electrostatic nozzle 76 is also installed on the force bearing frame 61, which is connected with the external ion wind generator through the air pipe (not shown in the figure), and the nozzle is directed to the feeding path of the carbon fiber filament. Because the carbon fiber filament is easy to generate static electricity due to friction during conveying, which may cause the filament to deviate and affect the cutting precision, the ion wind sprayed by the electrostatic nozzle 76 can quickly neutralize the static electricity on the surface of the filament, ensure that the filament always maintains a flat and straight conveying state, and provide a good premise for accurate cutting, further guarantee the cutting quality and sample strip consistency. As Figure 13 、 Figure 14As shown in the middle, the spline conveying mechanism 8 as the equipment to realize the automatic conveying of the cut spline, mainly consists of conveying driving part 81, V-shaped wheel conveying assembly 82 and baffle assembly 83 and several parts. Among them, the conveying driving part 81 and the V-shaped wheel conveying assembly 82 are installed on the force frame 61, the conveying driving part 81 adopts the stepping motor and the synchronous belt transmission mechanism to realize the accurate control of the conveying speed, and the conveying driving part 81 and the V-shaped wheel conveying assembly 82 are linked to provide power support for the V-shaped wheel conveying assembly 82; the V-shaped wheel conveying assembly 82 is composed of multiple groups of V-shaped conveying wheels, the notch of the V-shaped wheel is matched with the cross-sectional shape of the carbon fiber detection spline, which can ensure that the spline does not deviate during conveying, and is used to stably receive the cut carbon fiber detection spline; the baffle assembly 83 is fixedly installed at the end of the V-shaped wheel conveying assembly 82, which is used to limit the limit conveying position of the carbon fiber detection spline, so that the splines are neatly stacked in the specified area, facilitating subsequent manual collection or automatic sorting, and avoiding the loss of scattered splines. It should be noted that the present application also discloses a carbon fiber detection spline preparation method, which is realized by the above-mentioned carbon fiber multifilament pultrusion production line, comprising the following steps: S1, the hand expanding shaft 213 loads the carbon fiber original roll, the magnetic powder brake 214 is started, and under the dynamic adjustment of the tension adjusting device 22, the carbon fiber bundle is stably released to avoid the influence of uneven tension on the subsequent process; S2, the released carbon fiber bundle enters the glue dipping device 3, is guided by the guide roller group and is acted on by the glue dipping pressure roller, is fully dipped in glue, and the excess glue is removed by the glue extruding roller assembly to ensure uniform distribution of the glue; S3, the carbon fiber bundle after dipping in glue enters the wire passing channel 421 of the heating mold 42, is preliminarily cured in a low-temperature environment of 50-80℃, then enters the secondary heating and curing device 5 (high-temperature oven), is completely cured in a high-temperature environment of 120-150℃, and the curing parameters are accurately controlled to avoid local curing defects; S4, the completely cured carbon fiber bundle enters the traction channel of the traction feeding mechanism 6, the upper traction roller assembly 62 and the lower traction roller assembly 63 rotate cooperatively to stably convey it to the cutting mechanism 7, and the conveying speed is stable; S5, the power part 75 drives the moving knife 72 to reciprocate, cooperates with the fixed knife 71 to cut the carbon fiber bundle to a certain length, forms the carbon fiber detection spline, and in this process, the electrostatic nozzle 76 continuously sprays ion wind to remove the static electricity of the spline to ensure the cutting accuracy; S6, the cut carbon fiber detection spline falls into the V-shaped wheel conveying assembly 82, and under the driving of the conveying driving part 81, moves towards the end, is finally blocked by the baffle assembly 83, is neatly stacked in the specified position, and the preparation process is completed. The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A carbon fiber multifilament pultrusion production line, characterized by, The unwinding machine, the impregnation device, the primary heating and curing device, the secondary heating and curing device, the traction feeding machine, the cutting machine and the sample conveying machine are arranged in sequence along the advancing direction of the carbon fiber filaments on the machine table. The unwinding machine is used to carry the carbon fiber original roll and release the carbon fiber bundle. The impregnation device is used to impregnate the carbon fiber bundle with the glue solution. The primary heating and curing device is used to preliminarily cure the carbon fiber bundle after impregnation. The secondary heating and curing device is used to completely cure the carbon fiber bundle after preliminary curing. The traction feeding machine is used to convey the completely cured carbon fiber bundle to the cutting machine. The cutting machine is used to cut the completely cured carbon fiber bundle into a fixed length. The sample conveying machine is used to convey the carbon fiber test sample cut by the cutting machine.

2. The carbon fiber multifilament pultrusion line according to claim 1, characterized in that The unwinding machine comprises a yarn releasing device and a tension adjusting device. The yarn releasing device is used to support and position the carbon fiber original roll and rotate synchronously with the carbon fiber original roll during the release of the carbon fiber bundle. The tension adjusting device is linked with the yarn releasing device and used to detect the tension state of the carbon fiber bundle during the release of the carbon fiber bundle and adjust the tension of the carbon fiber bundle according to the detected tension state.

3. The carbon fiber multifilament pultrusion line according to claim 2, characterized in that The yarn releasing device comprises a hand sliding table, a machine base, a hand expanding shaft and a magnetic powder brake. The hand sliding table is used to carry the machine base and is installed on the machine table. The machine base is used to fixedly install the magnetic powder brake. The magnetic powder brake loads the hand expanding shaft and is in transmission cooperation with the hand expanding shaft.

4. The carbon fiber multifilament pultrusion line according to claim 3, wherein The tension adjusting device comprises an installation plate, an upstream guide wheel, a tension detecting wheel and a downstream guide wheel. The installation plate is installed on the machine table and provides installation support for the upstream guide wheel, the tension detecting wheel and the downstream guide wheel. The carbon fiber bundle is wound around the upstream guide wheel, the tension detecting wheel and the downstream guide wheel in sequence to form a preset running direction. The tension detecting wheel is used to detect the tension state of the carbon fiber bundle during the release of the carbon fiber bundle and feed the tension signal to the magnetic powder brake. The rotating resistance of the hand expanding shaft can be adjusted.

5. The carbon fiber multifilament pultrusion line according to claim 1, wherein The primary heating and curing device comprises a base, a heating mold, a position adjusting assembly and a pressure locking assembly. The base is installed on the machine table. The heating mold is placed on the base and has a filament passing channel. The position adjusting assembly is used to drive the heating mold to move along the direction of approaching or moving away from the carbon fiber filament conveying path. The pressure locking assembly is used to apply downward pressure to the adjusted heating mold and lock the position. Both of them are installed on the base.

6. The carbon fiber multifilament pultrusion line according to claim 5, wherein The position adjusting assembly is composed of an upstream front position adjusting subassembly, an upstream rear position adjusting subassembly, a downstream front position adjusting subassembly, and a downstream rear position adjusting subassembly; the upstream front position adjusting subassembly, the upstream rear position adjusting subassembly, the downstream front position adjusting subassembly, and the downstream rear position adjusting subassembly are in fixedly matched relationship with the base; along the direction perpendicular to the carbon fiber filament conveying path, the upstream front position adjusting subassembly and the upstream rear position adjusting subassembly are in opposite distribution, and the two are coordinated to exert force on the upstream side wall of the heating mold; along the direction perpendicular to the carbon fiber filament conveying path, the downstream front position adjusting subassembly and the downstream rear position adjusting subassembly are in opposite distribution, and the two are coordinated to exert force on the downstream side wall of the heating mold.

7. The carbon fiber multifilament pultrusion line according to claim 1, wherein The traction feeding machine comprises a force bearing frame, an upper traction roller assembly, and a lower traction roller assembly; the force bearing frame is installed on the machine table and provides installation support for the upper traction roller assembly; the lower traction roller assembly is installed on the machine table and is arranged opposite to the upper traction roller assembly to form a traction channel for the completely cured carbon fiber bundle.

8. The carbon fiber multifilament pultrusion line according to claim 7, characterized in that The cutting machine comprises a fixed blade, a movable blade, a blade seat, a guide assembly, and a power unit; the fixed blade, the blade seat, the guide assembly, and the power unit are installed on the force bearing frame; the fixed blade is arranged on the feeding path of the carbon fiber multifilament; the movable blade is fixedly installed on the blade seat; the power unit is in transmission connection with the blade seat and drives the blade seat to reciprocate along a preset direction under the auxiliary action of the guide assembly; the movable blade and the fixed blade are coordinated to cut the carbon fiber multifilament on the feeding path into segments.

9. The carbon fiber multifilament pultrusion line according to claim 7, wherein The sample conveying machine comprises a conveying drive unit, a V-shaped wheel conveying assembly, and a baffle assembly; the drive unit and the V-shaped wheel conveying assembly are installed on the force bearing frame, and the conveying drive unit and the V-shaped wheel conveying assembly are linked; the V-shaped wheel conveying assembly is used to receive the cut carbon fiber test sample, and the baffle assembly is used to limit the limit conveying position of the carbon fiber test sample.

10. A method for preparing carbon fiber test strips, characterized in that, The carbon fiber multifilament pultrusion production line is implemented by means of the carbon fiber multifilament pultrusion production line according to any one of claims 1-9, comprising the following steps: S1, the unwinding machine bears a carbon fiber original roll and releases a carbon fiber bundle; S2, the glue dipping device dips the released carbon fiber bundle in glue solution; S3, the primary heating and curing device preliminarily cures the dipped carbon fiber bundle, and then the secondary heating and curing device completely cures the preliminarily cured carbon fiber bundle; S4, the traction feeding machine conveys the completely cured carbon fiber bundle to the cutting machine; S5, the cutting machine cuts the carbon fiber bundle to a fixed length to form a carbon fiber test sample; S6, the sample conveying machine conveys the cut carbon fiber test sample to a designated position.

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