Automatic preparation equipment and preparation method for tensile property sample of carbon fiber multifilament

Abstract

The invention discloses automatic preparation equipment and a preparation method for a carbon fiber multifilament tensile property sample, and relates to the technical field of fiber multifilament sample preparation. The automatic preparation equipment comprises a pultrusion module and a gluing module; the pultrusion module is sequentially provided with a creel unit, a glue dipping unit, a curing unit and a traction cutting unit in the multifilament conveying direction; tension control wire releasing, quantitative gum dipping, continuous curing and fixed-length cutting are achieved; the gluing module comprises a positioning tool, a supporting plate, kraft paper, a gluing unit and a workpiece transferring unit, and positioning of the supporting plate, laying of the kraft paper, coating of a glue solution and fitting of a sample are completed by transferring stations through the positioning tool. Full-process automation and process parameter monitoring are achieved, the sample quality consistency is guaranteed, the sample preparation efficiency is improved, the batch production requirement is met, and a reliable sample foundation is provided for carbon fiber tensile property evaluation.

Description

Technical Field

[0001] This invention relates to the field of fiber multifilament sample preparation technology, specifically to an automated preparation equipment and method for carbon fiber multifilament tensile performance samples. Background Technology

[0002] Carbon fiber, with its superior properties such as high specific strength and high specific modulus, has become an indispensable key strategic material in both national defense and civilian fields. Its tensile properties (including tensile strength, tensile modulus, and elongation at break) are core assessment indicators for quality evaluation and grading, and the quality of sample preparation directly determines the accuracy of tensile property testing. Currently, the industry mainly follows GB / T3362-2017 "Test Method for Tensile Properties of Carbon Fiber Multifilament" for sample preparation and testing. This standard specifies two methods: manual impregnation and machine impregnation, but it does not specify sample preparation details, and there is no unified standard within the industry. This results in inconsistent evaluation results for carbon fiber tensile properties, becoming one of the main points of disagreement between manufacturers and users.

[0003] The preparation of carbon fiber multifilament tensile specimens involves four key steps: winding, impregnation, curing, and attaching reinforcing sheets. Each step significantly impacts specimen quality and consistency. Currently, the mainstream sample preparation method in China is manual preparation. Although it follows the procedure outlined in GB / T3362 2017—manually winding the multifilament onto a frame, immersing it in epoxy resin for 2-4 minutes, removing excess resin, straightening and fixing it, and then drying and attaching the reinforcing sheet after curing—the entire process lacks quantifiable indicators. Key parameters such as winding tension, impregnation time, and impregnation amount rely entirely on the operator's experience and skill, resulting in numerous uncontrollable factors. This leads to poor specimen stability and high dispersion, directly affecting test results. Furthermore, manual sample preparation is inefficient and time-consuming, making it difficult to meet production requirements.

[0004] To improve sample consistency and preparation efficiency, several auxiliary sample preparation devices have been developed in China in recent years, but significant shortcomings remain. According to published patents, the sample preparation device disclosed in CN117664673A can only achieve sample pre-forming, cannot fully cure, and lacks a patching device; the continuous preparation system disclosed in CN219416911U lacks a patching unit; and the devices disclosed in CN219694671U and CN113607533B are not equipped with curing and patching devices. These devices mostly mechanize only the impregnation stage; curing and patching still require manual assistance. This discontinuous process not only leads to the release of tension in the multifilament after impregnation but also affects sample quality. Furthermore, the lack of full continuity and automation makes it difficult to guarantee sample preparation efficiency and consistency.

[0005] In summary, both existing manual and equipment-assisted sample preparation methods suffer from discontinuous processes, excessive human intervention, and low efficiency, failing to meet the requirements of mass production for sample preparation efficiency and sample consistency. Therefore, achieving continuous and automated sample preparation, precisely controlling the consistency of process conditions such as tension, impregnation time, impregnation amount, and curing time, and minimizing human interference are crucial for objectively and accurately evaluating the tensile properties of carbon fiber multifilaments. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an automated preparation device and method for carbon fiber multifilament tensile performance specimens.

[0007] This invention discloses an automated equipment for preparing carbon fiber multifilament tensile test specimens, comprising:

[0008] The pultrusion module includes a yarn frame unit, an impregnation unit, a curing unit and a traction cutting unit arranged sequentially along the carbon fiber bundle conveying direction. The traction cutting unit is used to drive the carbon fiber multifilament to move and cut it to a preset length to obtain a carbon fiber multifilament sample.

[0009] The gluing module includes a positioning fixture transfer unit, a pallet transfer unit, a kraft paper transfer unit, a gluing unit, and a part transfer unit. The positioning fixture transfer unit carries the pallet and moves it between the workstations of each unit. The pallet transfer unit picks up the pallet from the pallet hopper and transfers it to the positioning fixture of the positioning fixture transfer unit. The kraft paper transfer unit picks up kraft paper from the kraft paper hopper and transfers it to a designated position on the pallet. The gluing unit applies resin adhesive to the surface of the kraft paper on the pallet according to preset parameters. The part transfer unit picks up the carbon fiber multifilament sample cut by the traction cutting unit and transfers it to a designated position on the glued kraft paper.

[0010] As a further improvement of the present invention, the pultrusion module further includes a first frame, on the table surface of the first frame, along the carbon fiber multifilament conveying direction, a yarn frame unit, an impregnation unit, a curing unit and a traction cutting unit are arranged sequentially.

[0011] The yarn frame unit includes a hand-operated expansion shaft, a tension sensor, and a yarn breakage detection sensor arranged in sequence. A magnetic powder brake is installed at one end of the hand-operated expansion shaft. A yarn spool with carbon fiber bundles wound on the hand-operated expansion shaft is installed on the hand-operated expansion shaft. The traction cutting unit cooperates with the rotation of the hand-operated expansion shaft to sequentially transport the carbon fiber bundles to the tension sensor and the impregnation unit. The yarn breakage detection sensor is used for yarn breakage alarm.

[0012] As a further improvement of the present invention, the impregnation unit includes an impregnation tank and a resin return tank arranged sequentially along the carbon fiber bundle conveying direction; the impregnation tank is filled with resin liquid, and at least one set of impregnation rollers are arranged at intervals in the impregnation tank, and an extrusion roller group is provided at the end of the impregnation tank; the extrusion rollers include two extrusion rollers arranged vertically, and the two extrusion rollers respectively abut against the carbon fiber bundle and apply pressure to the carbon fiber bundle; the axial directions of the impregnation rollers and the extrusion rollers are both perpendicular to the carbon fiber bundle conveying direction.

[0013] The carbon fiber bundle output by the tension sensor passes under the impregnation roller to achieve full impregnation. After impregnation, the carbon fiber bundle is extruded by the extrusion roller group and then transported to the curing unit. The excess adhesive generated by the extrusion is returned to the resin return tank.

[0014] As a further improvement of the present invention, the curing unit includes a curing mold and an oven arranged sequentially along the carbon fiber bundle conveying direction, and the curing mold is equipped with a heating plate;

[0015] After being impregnated by the impregnation unit, the carbon fiber bundles are sequentially conveyed to the traction and cutting unit through the curing mold and the oven. The curing mold is used to heat the adhesive on the carbon fiber bundles to accelerate the curing of the adhesive and ensure the shape of the carbon fiber bundles. The oven is used to cure the pre-cured and shaped carbon fiber bundles by heating.

[0016] As a further improvement of the present invention, the traction cutting unit includes a fixing frame, wherein a traction part is provided on the side of the fixing frame near the impregnation unit, and a cutting part and a discharge part are provided on the side of the fixing frame away from the impregnation unit.

[0017] The traction unit includes an upper traction roller and a lower traction roller arranged vertically. The upper traction roller is driven by a cylinder to move up and down to cooperate with the lower traction roller to adhere to the carbon fiber bundle and drive the carbon fiber bundle to be conveyed to the discharge unit. The fixing frame is provided with through holes for the carbon fiber bundle to pass through. The cutting unit cuts the carbon fiber bundle to a preset length to obtain a carbon fiber multifilament sample.

[0018] As a further improvement of the present invention, the glue application module further includes a second frame, on the table of the second frame, a positioning tooling transfer unit is provided;

[0019] The positioning fixture transfer unit includes a first single-axis motion module laid along the length of the second frame. A positioning fixture is installed on the moving part of the first single-axis motion module. The positioning fixture is provided with a pallet positioning groove for bearing and limiting the fixing of the pallet. The first single-axis motion module sequentially forms a pallet transfer station, a kraft paper transfer station, a glue application station and a part transfer station along the moving direction of the moving part. The second frame table is sequentially provided with pallet transfer units, kraft paper transfer units, glue application units and part transfer units corresponding to each station.

[0020] As a further improvement of the present invention, the pallet transfer unit includes a first dual-axis motion module. The X-axis moving part of the first dual-axis motion module is horizontally disposed above the first single-axis motion module. The Z-axis moving part of the first dual-axis motion module is equipped with a first suction cup mounting plate. The bottom of the first suction cup mounting plate is provided with a first vacuum suction cup for gripping the pallet from the pallet hopper.

[0021] The kraft paper transfer unit includes a second dual-axis motion module. The X-axis moving part of the second dual-axis motion module is horizontally arranged above the first single-axis motion module. The Z-axis moving part of the second dual-axis motion module is equipped with a second suction cup mounting plate. The bottom of the second suction cup mounting plate is provided with a second vacuum suction cup for gripping the kraft paper from the kraft paper hopper.

[0022] The part transfer unit includes a third biaxial motion module. The X-axis moving part of the third biaxial motion module extends toward the traction cutting unit, and the Z-axis moving part of the third biaxial motion module is equipped with a gripping mechanism for gripping carbon fiber multifilament samples.

[0023] As a further improvement of the present invention, the glue application unit includes a second single-axis motion module, which is mounted across the first single-axis motion module via a frame, and a glue application part is installed on its moving part; the glue application part includes a screw valve fixing plate, a two-component screw valve, a static mixing tube and a glue dispensing needle, and the two-component screw valve, the static mixing tube and the glue dispensing needle are arranged sequentially from top to bottom on the screw valve fixing plate;

[0024] The static mixing tube has a double helix structure; the second single-axis motion module drives the coating part to move along a preset trajectory to apply glue to the preset surface position of the kraft paper.

[0025] As a further improvement of the present invention, both the kraft paper hopper and the pallet hopper include a base and a bottom plate disposed thereon; the bottom plate is provided with two sets of fixed baffles and two sets of centering baffles, which together enclose the hopper to form the hopper; and the centering baffles are arranged adjacent to the fixed baffles; the centering baffles are L-shaped, and their horizontal sections are connected to the bottom plate through a locking handle, and the position of the centering baffles can be adjusted by loosening the locking handle;

[0026] A photoelectric switch is installed at the bottom of the kraft paper hopper, which is used to detect whether the kraft paper in the hopper is exhausted.

[0027] The bottom of the pallet hopper is equipped with a proximity switch, which is used to detect whether the pallets in the hopper are exhausted.

[0028] This invention also discloses an automated method for preparing carbon fiber multifilament tensile test specimens, which is applied to the aforementioned automated preparation equipment for carbon fiber multifilament tensile test specimens, comprising:

[0029] The carbon fiber multifilament spool is installed in the yarn frame unit of the pultrusion module. The yarn frame unit is adjusted to maintain the stability of the multifilament tension and monitors the multifilament status simultaneously. The multifilament is then conveyed to the impregnation unit.

[0030] Carbon fiber multifilaments are impregnated with adhesive solution in the impregnation unit, and excess adhesive solution is removed by the extrusion roller group of the impregnation unit to control the amount of adhesive impregnation. The excess adhesive solution is recycled.

[0031] After being impregnated with resin, the carbon fiber multifilaments undergo pre-curing and full curing sequentially through a curing unit.

[0032] The cured carbon fiber multifilament is moved by the traction cutting unit and cut to a preset length to obtain a carbon fiber multifilament sample. The carbon fiber multifilament sample is then transported to a preset position.

[0033] The positioning fixture transfer unit of the glue application module drives the positioning fixture to the pallet transfer station, and the pallet transfer unit grabs the pallet from the pallet hopper and places it in the positioning fixture for fixation.

[0034] The positioning fixture moves the pallet to the kraft paper transfer station, where the kraft paper transfer unit grabs kraft paper from the kraft paper hopper and places it at the designated position on the pallet.

[0035] The positioning fixture moves the pallet to the gluing station, and the gluing unit mixes the resin according to preset parameters and then applies it to the surface of the kraft paper along a preset trajectory.

[0036] Position the tooling to the part transfer station, and the part transfer unit grabs the carbon fiber multifilament sample from the traction and cutting unit and places it on the coated kraft paper.

[0037] The positioning fixture returns to the kraft paper transfer station, and the kraft paper transfer unit grabs the kraft paper again and places it on top of the carbon fiber multifilament sample.

[0038] The positioning fixture moves the prepared multifilament sample to the material handling station, where the tray with the multifilament sample is manually removed.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0040] This invention, through an integrated design of a "pultrusion module + adhesive coating module," achieves fully automated and continuous operation of the entire process, from tension control and unwinding of carbon fiber multifilaments, quantitative adhesive impregnation, continuous curing, traction cutting to automatic application of reinforcing sheets. It effectively solves the core problems of existing manual and equipment-assisted sample preparation, such as fragmented processes, excessive manual intervention, uncontrollable process parameters, poor sample quality consistency, and low sample preparation efficiency. It meets the needs of batch and continuous production while also considering safety and environmental protection characteristics.

[0041] This invention integrates the entire sample preparation process, including tension control and fiber feeding, quantitative resin impregnation, continuous curing, traction cutting, pallet transfer, kraft paper laying, resin coating, and sample bonding, into a continuous process through the coordinated connection of the pultrusion module and the glue coating module. It also monitors key process parameters such as tension, mold temperature, oven temperature, traction rate, resin coating length, and glue coating amount in real time, completely breaking the limitations of existing equipment-assisted sample preparation where curing and bonding processes rely on manual labor and are disconnected from the process. This significantly shortens the sample preparation cycle and meets the needs of mass production.

[0042] This invention achieves stable tension application to carbon fiber multifilaments throughout the entire sample preparation process through closed-loop adjustment of the magnetic powder brake and tension sensor in the yarn frame unit, avoiding tension release caused by process interruption. Simultaneously, relying on a standardized equipment structure, it ensures consistency of process conditions such as tension, impregnation time, and curing parameters by precisely controlling the amount of resin impregnation with adjustable extrusion rollers, graded regulation of curing temperature in the curing mold and oven, and precise cutting of cutting components to preset lengths. This completely solves the problem of high sample dispersion caused by reliance on operator experience in manual sample preparation, thus guaranteeing the accuracy of tensile performance testing.

[0043] This invention relies on the coordinated operation of each unit of the gluing module. The motion modules of the pallet transfer unit and the kraft paper transfer unit, along with the suction cups, complete the precise transfer of materials. The part transfer unit realizes the positioning and bonding of the sample. The gluing unit adopts a two-component screw valve and a double-spiral static mixing tube to realize the automatic and continuous coating of resin and precise control of the glue output and mixing ratio. This avoids the accuracy deviation of manual patching, reduces glue waste, and ensures the bonding strength between the reinforcing sheet and the sample. Attached Figure Description

[0044] Figure 1This is a schematic diagram of the structure of an automated preparation equipment for carbon fiber multifilament tensile performance test specimens disclosed in one embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of the pultrusion module of an automated carbon fiber multifilament tensile performance specimen preparation device disclosed in one embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of the structure of the yarn frame unit of the automated preparation equipment for carbon fiber multifilament tensile performance test specimens disclosed in one embodiment of the present invention;

[0047] Figure 4 This is a schematic diagram of the assembly of the manual expansion shaft and magnetic powder brake of an automated preparation equipment for tensile properties of carbon fiber multifilament specimens disclosed in one embodiment of the present invention.

[0048] Figure 5 This is a schematic diagram of the impregnation unit of an automated carbon fiber multifilament tensile performance specimen preparation device disclosed in one embodiment of the present invention;

[0049] Figure 6 This is a schematic diagram of the curing unit of an automated carbon fiber multifilament tensile performance specimen preparation device disclosed in one embodiment of the present invention;

[0050] Figure 7 This is a schematic diagram of the traction cutting unit of an automated carbon fiber multifilament tensile performance specimen preparation device disclosed in an embodiment of the present invention.

[0051] Figure 8 This is a schematic diagram of the traction cutting unit of the automated carbon fiber multifilament tensile performance specimen preparation equipment disclosed in one embodiment of the present invention from another angle.

[0052] Figure 9 This is a schematic diagram of the coating module of an automated carbon fiber multifilament tensile performance specimen preparation device disclosed in one embodiment of the present invention;

[0053] Figure 10 This is a schematic diagram of the coating module of the automated carbon fiber multifilament tensile performance specimen preparation equipment disclosed in one embodiment of the present invention from another angle.

[0054] Figure 11 This is a schematic diagram of the positioning tooling transfer unit of an automated carbon fiber multifilament tensile performance specimen preparation equipment disclosed in one embodiment of the present invention;

[0055] Figure 12 This is a schematic diagram of the workstation of an automated carbon fiber multifilament tensile performance specimen preparation equipment disclosed in one embodiment of the present invention;

[0056] Figure 13This is a schematic diagram of the positioning fixture structure of an automated preparation equipment for carbon fiber multifilament tensile performance test specimens disclosed in one embodiment of the present invention;

[0057] Figure 14 This is a schematic diagram of the pallet transfer unit of an automated carbon fiber multifilament tensile performance specimen preparation device disclosed in one embodiment of the present invention.

[0058] Figure 15 This is a schematic diagram of the pallet hopper of an automated carbon fiber multifilament tensile performance specimen preparation device disclosed in one embodiment of the present invention.

[0059] Figure 16 This is a schematic diagram of the structure of the tray of an automated preparation equipment for tensile performance test specimens of carbon fiber multifilaments disclosed in one embodiment of the present invention.

[0060] Figure 17 This is a schematic diagram of the kraft paper transfer unit of an automated carbon fiber multifilament tensile performance specimen preparation device disclosed in one embodiment of the present invention.

[0061] Figure 18 This is a schematic diagram of the kraft paper hopper of an automated preparation equipment for carbon fiber multifilament tensile performance test specimens disclosed in one embodiment of the present invention.

[0062] Figure 19 This is a schematic diagram of the component transfer unit of an automated carbon fiber multifilament tensile performance specimen preparation device disclosed in one embodiment of the present invention.

[0063] Figure 20 This is a schematic diagram of the gripping mechanism of the part transfer unit of the automated carbon fiber multifilament tensile performance specimen preparation equipment disclosed in one embodiment of the present invention.

[0064] Figure 21 This is a schematic diagram of the coating unit of an automated carbon fiber multifilament tensile performance specimen preparation device disclosed in one embodiment of the present invention;

[0065] Figure 22 This is a schematic diagram of the coating section of an automated carbon fiber multifilament tensile performance specimen preparation device disclosed in one embodiment of the present invention;

[0066] Figure 23 This is a schematic diagram of the adhesive application trajectory of an automated carbon fiber multifilament tensile performance specimen preparation device disclosed in one embodiment of the present invention;

[0067] Figure 24 This is a schematic diagram of the finished sample structure of an automated preparation equipment for carbon fiber multifilament tensile performance test samples disclosed in an embodiment of the present invention.

[0068] Figure 25This is a flowchart of an automated method for preparing carbon fiber multifilament tensile test specimens according to an embodiment of the present invention.

[0069] In the picture:

[0070] 1. Pultrusion Module; 11. Yarn Frame Unit; 11-1. Hand-held Expansion Shaft; 11-1-1. Hand-held Expansion Shaft Tightening Knob; 11-2. Tension Sensor; 11-3. Yarn Breakage Detection Sensor; 11-4. Magnetic Powder Brake; 12. Impregnation Unit; 12-1. Impregnation Tank; 12-2. Resin Return Tank; 12-3. Yarn Guide Roller; 12-4. Impregnation Roller; 12-5. Extrusion Roller Assembly; 13. Curing Unit; 13-1. Curing Mold; 13-2. Oven; 13-3. Heating Plate; 13-4. Mold Fixing Frame; 14. Traction and Cutting Unit; 14-1. Upper Traction Roller; 14-2. Lower Traction Roller; 4-3. Fixed frame; 14-4. Cylinder; 14-5. Cutting section; 14-6. Discharge section; 14-7. Limiting plate; 14-8. Limiting plate cylinder; 15. First frame; 2. Glue application module; 21. Second frame; 22. Positioning fixture transfer unit; 22-1. First single-axis motion module; 22-2. Mold mounting plate; 23. Kraft paper transfer unit; 23-1. Second dual-axis motion module; 23-2. Kraft paper hopper; 23-3. Second suction cup mounting plate; 23-4. Buffer guide rod; 23-5. Second vacuum suction cup; 23-6. Photoelectric switch; 24. Pallet transfer unit; 24 -1. First dual-axis motion module; 24-2. Pallet hopper; 24-3. First suction cup mounting plate; 24-4. First vacuum suction cup; 24-5. Second proximity switch; 25. Glue application unit; 25-1. Second single-axis motion module; 25-2. Glue application section; 25-2-1. Screw valve fixing plate; 25-2-2. Two-component screw valve; 25-2-3. Static mixing tube; 25-2-4. Glue dispensing needle; 25-2-5. Needle fixing bracket; 26. Part transfer unit; 26-1. Third dual-axis motion module; 26-2. Gripping mechanism; 3. Positioning fixture; 3-1. Pallet positioning slot; 3-2 Clamping cylinder; 3-3 Tooling and mold positioning pin holes; 3-4 First proximity switch; 4 Manual material handling station; 5 Pallet transfer station; 6 Kraft paper transfer station; 7 Glue application station; 8 Part transfer station; 100 Carbon fiber tow / carbon fiber multifilament strip; 100-1 Carbon fiber multifilament sample; 200 Pallet; 200-1 Kraft paper placement slot; 200-2 Tow placement slot; 300 Kraft paper; 400 Glue application trajectory; 500 Resin; 600 Base; 700 Base plate; 800 Fixing baffle; 900 Centering baffle; 1000 Tightening handle. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0072] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0073] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0074] The present invention will now be described in further detail with reference to the accompanying drawings:

[0075] like Figure 1As shown, an automated preparation device for carbon fiber multifilament tensile performance specimens according to the present invention includes a pultrusion module 1 and a coating module 2. The pultrusion module 1 includes a yarn frame unit 11, a coating unit 12, a curing unit 13, and a traction cutting unit 14 arranged sequentially along the conveying direction of the carbon fiber tow / carbon fiber multifilament sample 100. The traction cutting unit 14 is used to move the carbon fiber multifilament 100 and cut it to a preset length to obtain a carbon fiber multifilament specimen 100-1. The coating module 2 includes a positioning fixture transfer unit 22, a pallet transfer unit 24, a kraft paper transfer unit 23, a coating unit 25, and a part transfer unit 26. The positioning fixture transfer unit... Unit 22 is used to support the pallet 200 and move it between the workstations of each unit; Pallet transfer unit 24 is used to pick up the pallet 200 from the pallet hopper 24-2 and transfer it to the positioning fixture 3 of the positioning fixture transfer unit 22; Kraft paper transfer unit 23 is used to pick up the kraft paper 300 from the kraft paper hopper 23-2 and transfer it to the designated position of the pallet 200; Glue application unit 25 is used to apply resin 500 adhesive to the surface of the kraft paper 300 on the pallet 200 according to preset parameters; Part transfer unit 26 is used to pick up the carbon fiber multifilament sample 100-1 cut by the traction cutting unit 14 and transfer it to the designated position of the glued kraft paper 300.

[0076] Specifically:

[0077] like Figure 2-4 As shown, in the above embodiment, preferably, the pultrusion module 1 further includes a first frame 15. On the table surface of the first frame 15, along the conveying direction of the carbon fiber multifilament 100, a yarn frame unit 11, an impregnation unit 12, a curing unit 13, and a traction cutting unit 14 are arranged sequentially. The yarn frame unit 11 includes a hand-operated shaft 11-1, a tension sensor 11-2, and a yarn breakage detection sensor 11-3 arranged sequentially. A magnetic powder brake 11-4 is installed at one end of the hand-operated shaft 11-1. A yarn spool wound with carbon fiber filaments is installed on the hand-operated shaft 11-1. The traction cutting unit 14 cooperates with the hand-operated shaft 11-1 to rotate and convey the carbon fiber filaments sequentially to the tension sensor 11-2 and the impregnation unit 12. The yarn breakage detection sensor 11-3 is used for yarn breakage alarm.

[0078] In the above embodiment, preferably, the magnetic powder brake 11-4 adjusts the output torque in real time according to the detection data fed back by the tension sensor 11-2 to ensure that the yarn tension is consistent with the set value.

[0079] In the above embodiments, preferably, when preparing the sample, a bobbin with a filament bundle of the required specifications is selected, fitted onto the outer wall of the hand-operated tensioning shaft 11-1, and the tensioning knob 11-1-1 is tightened to fix the bobbin. After the filament bundle is unwound from the bobbin, it passes sequentially through the tension sensor 11-2 and the yarn breakage detection sensor 11-3. The yarn frame unit 11 is equipped with the yarn breakage detection sensor 11-3, which will trigger an alarm when the yarn breaks. Specifically, when the carbon fiber filament bundle is wound on the bobbin, the bobbin is first placed on the hand-operated tensioning shaft 11-1 of the yarn frame unit 11. The hand-operated tensioning shaft 11-1 is a rotating shaft structure, and a tensioning knob 11-1-1 is provided on the hand-operated tensioning shaft 11-1-1. When the tensioning knob 11-1-1 is rotated clockwise, the hand-operated tensioning shaft 11-1 tightens; when the tensioning knob 11-1-1 is rotated counterclockwise, the hand-operated tensioning shaft 11-1 loosens. Specifically, the hand-operated expansion shaft 11-1 has toothed protrusions on its sidewalls along its length. Rotating the expansion shaft tension knob 11-1-1 changes the height of these protrusions, thereby altering the radial dimension of the hand-operated expansion shaft 11-1. Adjusting the tension knob 11-1-1 changes the radial dimension of the hand-operated expansion shaft 11-1, ensuring tight contact between the hand-operated expansion shaft 11-1 and the inner wall of the yarn drum, thus causing the yarn drum and the hand-operated expansion shaft 11-1 to rotate synchronously. The rotation of the hand-operated expansion shaft 11-1 unwinds the coiled yarn bundle and conveys it to the tension sensor 11-2. The tension sensor 11-2 measures the yarn bundle tension to adjust the unwinding damping provided by the magnetic powder brake 11-4, thereby regulating the tension of the yarn bundle during transport.

[0080] In this embodiment, the carbon fiber tow / carbon fiber multifilament strip 100 is a flat strip structure with a predetermined width. The multifilament includes multiple carbon fiber monofilaments. For example, a 1k tow is represented by 1000 carbon fiber monofilaments. The tension of the tow varies with the number of monofilaments. The more monofilaments, the greater the required tension. In this embodiment, the tension parameter of the 3k tow is set to 5N, the tension parameter of the 6k tow is set to 10N, and the tension parameter of the 12k tow is set to 20N.

[0081] like Figure 5As shown, in the above embodiment, preferably, the impregnation unit 12 includes an impregnation tank 12-1 and a resin return tank 12-2 arranged sequentially along the conveying direction of the carbon fiber tow / carbon fiber multifilament sample 100; the impregnation tank 12-1 is filled with resin liquid, and a yarn guide roller 12-3 and at least one set of impregnation rollers 12-4 are arranged sequentially in the impregnation tank 12-1; an extrusion roller group 12-5 is arranged at the end of the impregnation tank 12-1; the extrusion roller group 12-5 includes two extrusion rollers arranged vertically, and the two extrusion rollers respectively interact with the carbon fiber tow / carbon fiber multifilament sample 100. The carbon fiber tow / carbon fiber multifilament sample 100 abuts against the carbon fiber tow / carbon fiber multifilament sample 100 and applies pressure to it; the axial directions of the impregnation roller 12-4 and the extrusion roller are both perpendicular to the conveying direction of the carbon fiber tow / carbon fiber multifilament sample 100; the carbon fiber tow output by the tension sensor 11-2 passes under the impregnation roller 12-4 to achieve full impregnation, and the carbon fiber tow / carbon fiber multifilament sample 100 after impregnation is extruded by the extrusion roller group 12-5 and conveyed to the curing unit 13; the excess glue produced by extrusion is returned to the resin return tank 12-2.

[0082] In the above embodiments, preferably, the dipping roller 12-4 is a rolling type, adjustable in height within a certain range, and is made of polytetrafluoroethylene. The extrusion roller group 12-5 is a rolling type, the spacing of the extrusion roller group 12-5 is adjustable, and it is made of polytetrafluoroethylene.

[0083] In the above embodiments, preferably, the side wall of the impregnation tank 12-1 has graduations, is coated with polytetrafluoroethylene, has a smooth shape, and the corners are smoothly connected without sharp edges, and is detachable.

[0084] In the above embodiment, preferably, the impregnation unit 12 is located downstream of the yarn frame unit 11, and is used to impregnate the yarn bundle conveyed from the yarn frame unit 11 with epoxy resin. The impregnation unit 12 includes an impregnation tank 12-1 and a resin return tank 12-2; the impregnation tank 12-1 contains epoxy resin, and the yarn bundle is impregnated with epoxy resin during the conveying process in the impregnation tank 12-1. The impregnation tank 12-1 is a box-type structure with rounded connections, which makes the connection between adjacent side walls and the connection between the side walls and the bottom of the impregnation tank 12-1 without sharp edges, avoiding the difficulty of cleaning the epoxy resin at the sharp edges, and ensuring that the remaining epoxy resin in the impregnation tank 12-1 can be easily cleaned. The length of the impregnation tank 12-1 is set in the same direction as the conveying direction of the yarn bundle, so that the yarn bundle can be fully impregnated with the epoxy resin in the impregnation tank 12-1. Two sets of impregnation rollers 12-4 are installed in the impregnation tank 12-1, and their positions are fixed by bolts. During sample preparation, the carbon fiber tow / carbon fiber multifilament sample 100 passes under the two sets of impregnation rollers 12-4, ensuring that the carbon fiber tow / carbon fiber multifilament sample 100 is fully impregnated with the resin during movement. The extrusion roller assembly 12-5 includes two extrusion rollers respectively positioned at both ends of the carbon fiber tow / carbon fiber multifilament sample 100 in the thickness direction. The two extrusion rollers abut against the tow and apply pressure to the carbon fiber tow / carbon fiber multifilament sample 100. When the carbon fiber tow / carbon fiber multifilament sample 100 passes through the extrusion roller assembly 12-5, the two extrusion rollers squeeze the carbon fiber tow / carbon fiber multifilament sample 100 in the thickness direction to remove excess resin. The excess resin removed by the extrusion roller assembly 12-5 flows back to the resin return tank 12-2 to avoid resin waste. The resin return tank 12-2 is located downstream of the extrusion roller group 12-5. It can also be used to collect the resin liquid that is heated and extruded at the curing unit 13, while preventing the heated resin from mixing into the impregnation tank 12-1.

[0085] like Figure 6 As shown, in the above embodiment, preferably, the curing unit 13 includes a curing mold 13-1 and an oven 13-2 arranged sequentially along the conveying direction of the carbon fiber tow / carbon fiber multifilament sample 100. The curing mold 13-1 is equipped with a heating plate 13-3. After being impregnated by the impregnation unit 12, the carbon fiber tow / carbon fiber multifilament sample 100 is conveyed to the traction and cutting unit 14 after passing through the curing mold 13-1 and the oven 13-2 in sequence. The curing mold 13-1 is used to heat the adhesive on the carbon fiber tow / carbon fiber multifilament sample 100 to accelerate the curing of the adhesive and ensure the shape of the carbon fiber tow / carbon fiber multifilament sample 100. The oven 13-2 is used to cure the pre-cured and shaped carbon fiber tow / carbon fiber multifilament sample 100 by heating.

[0086] In the above embodiment, preferably, the heating plate 13-3 is equipped with a thermocouple to detect the temperature of the curing mold 13-1 in real time.

[0087] In the above embodiments, preferably, the oven 13-2 adopts a side-opening structure, and the top of the oven 13-2 is equipped with a thermocouple to detect the temperature of the oven 13-2 in real time.

[0088] In the above embodiment, preferably, the curing unit 13 includes a curing mold 13-1, an oven 13-2, a heating plate 13-3, and a mold fixing frame 13-4. The heating plate 13-3 is an L-shaped heating plate, and two heating plates 13-3 clamp and heat the curing mold 13-1. An exhaust gas collection device (not shown in the figure) is provided above the curing mold 13-1. The curing mold 13-1 consists of upper and lower parts connected by pins, which facilitates disassembly and mold cleaning after the preparation of the fiber bundle sample, preventing the residual adhesive in the curing mold 13-1 from damaging the carbon fiber bundle in the next preparation process after curing. During the curing process, the adhesive will volatilize exhaust gas. The exhaust gas collection device is used to discharge the exhaust gas volatilized from the curing unit 13. The exhaust gas collection device can be connected to the exhaust system of the installation site. The oven 13-2 is located downstream of the curing mold 13-1 and is used to cure the pre-cured and shaped carbon fiber bundle / carbon fiber multifilament sample 100 by heating.

[0089] like Figure 7-8 As shown, the traction and cutting unit 14 includes a fixed frame 14-3. The fixed frame 14-3 is provided with a traction part on the side near the impregnation unit 12, and a cutting part 14-5 and a discharge part 14-6 are provided on the side away from the impregnation unit 12. The traction part includes an upper traction roller 14-1 and a lower traction roller 14-2 arranged vertically. The upper traction roller 14-1 is driven by a cylinder 14-4 to move up and down to cooperate with the lower traction roller 14-2 to adhere to the carbon fiber bundle / carbon fiber multifilament sample 100 and drive the carbon fiber bundle / carbon fiber multifilament sample 100 to be conveyed to the discharge part 14-6. The fixed frame 14-3 is provided with a through hole for the carbon fiber bundle / carbon fiber multifilament sample 100 to pass through. The cutting part 14-5 cuts the carbon fiber bundle / carbon fiber multifilament sample 100 to a preset length to obtain a carbon fiber multifilament sample. The length of the carbon fiber multifilament sample meets the requirements of GB / T 3362-2017, and the test section of the sample is not damaged during cutting. The bottom of the first frame 15 corresponding to the cutting section 14-5 is equipped with a waste box, and the cutting debris falls and is collected in the waste box.

[0090] In the above embodiment, preferably, the discharge section 14-6 is composed of several V-shaped guide wheels to transport the cut filament strip sample to a designated position; the limiting plate 14-7 is used to block the filament strip on the output discharge section 14-6; the limiting plate cylinder 14-8 is used to control the extension and retraction of the limiting plate 14-7.

[0091] like Figure 9-12 As shown, in the above embodiment, preferably, the gluing module 2 further includes a second frame 21, and a positioning fixture transfer unit 22 is provided on the table of the second frame 21; wherein, the positioning fixture transfer unit 22 includes a first single-axis motion module 22-1 laid along the length direction of the second frame 21, the first single-axis motion module 22-1 is fixedly installed on the table of the second frame 21 by a mold mounting plate 22-2, a positioning fixture 3 is installed on the moving part of the first single-axis motion module 22-1, and a pallet positioning groove 3-1 for bearing and limiting the fixed pallet is provided on the positioning fixture 3; the first single-axis motion module 22-1 sequentially forms a manual material picking station 4, a pallet transfer station 5, a kraft paper transfer station 6, a gluing station 7 and a part transfer station 8 along the moving direction of the moving part; a pallet transfer unit 24, a kraft paper transfer unit 23, a gluing unit 25 and a part transfer unit 26 are sequentially provided on the table of the second frame 21 corresponding to each station.

[0092] like Figure 13 As shown, in the above embodiment, preferably, the positioning fixture 3 is provided with a pallet positioning groove 3-1 for supporting and limiting the fixed pallet, and also includes four clamping cylinders 3-2 arranged around the pallet positioning groove 3-1. The bottom of the positioning fixture 3 is equipped with a first proximity switch 3-4, which is used to detect whether the pallet 200 is placed in place. In actual installation, after the positioning fixture 3 is positioned by the tooling and mold positioning pin hole 3-3, it is fixed on the moving part of the first single-axis motion module 22-1.

[0093] like Figure 14 As shown, in the above embodiment, preferably, the pallet transfer unit 24 includes a first dual-axis motion module 24-1. The X-axis moving part of the first dual-axis motion module 24-1 is transversely disposed above the first single-axis motion module 22-1, that is, the moving direction of the X-axis moving part is perpendicular to the laying direction of the first single-axis motion module 22-1. The Z-axis moving part of the first dual-axis motion module 24-1 is equipped with a first suction cup mounting plate 24-3, and the bottom of the first suction cup mounting plate 24-3 is provided with a first vacuum suction cup 24-4 for gripping the pallet 200 from the pallet hopper 24-2.

[0094] In the above embodiment, preferably, the pallet hopper 24-2 is fixed to the profile frame base plate of the table of the second frame 21 and positioned by positioning pins.

[0095] like Figure 15As shown, in the above embodiment, preferably, the pallet hopper 24-2 includes a base 600 and a bottom plate 700 disposed thereon; the bottom plate 700 is provided with two sets of fixed baffles 800 and two sets of centering baffles 900, which together form a hopper; and the centering baffles 900 are arranged adjacent to the fixed baffles 800; the centering baffles 900 are L-shaped, and their horizontal section is connected to the bottom plate 700 through a locking handle 1000. Loosening the locking handle 1000 can adjust the position of the centering baffles 900 to facilitate workers placing pallets 200; a second proximity switch 24-5 is provided at the bottom of the pallet hopper 24-2, which is used to detect whether the pallets 200 in the hopper are exhausted. When the pallets 200 in the hopper are exhausted, the equipment's yellow light flashes to remind workers to replenish the material.

[0096] like Figure 16 As shown, in the above embodiment, preferably, the tray 200 has a hollow design in the middle, and the two opposite sides of the tray 200 are shaped as kraft paper placement grooves 200-1 for placing kraft paper; multiple filament placement grooves 200-2 are formed at intervals on the kraft paper placement grooves 200-1 on both sides of the tray 200; the two ends of the carbon fiber filament / carbon fiber multifilament strip 100 can cross the hollow part and overlap the corresponding filament placement groove 200-2.

[0097] like Figure 17 As shown, in the above embodiment, preferably, the kraft paper transfer unit 23 includes a second dual-axis motion module 23-1. The X-axis moving part of the second dual-axis motion module 23-1 is transversely disposed above the first single-axis motion module 22-1, that is, the moving direction of the X-axis moving part is perpendicular to the laying direction of the first single-axis motion module 22-1. The Z-axis moving part of the second dual-axis motion module 23-1 is equipped with a second suction cup mounting plate 23-3, and the bottom of the second suction cup mounting plate 23-3 is provided with a second vacuum suction cup 23-5 for gripping the kraft paper 300 from the kraft paper hopper 23-2.

[0098] In the above embodiment, preferably, the kraft paper transfer unit 23 further includes buffer guide rods 23-4. In actual installation, the second suction cup mounting plate 23-3 is mounted on the Z-direction moving part of the second dual-axis motion module 23-1, and the bottom of the second suction cup mounting plate 23-3 is connected to the second vacuum suction cup 23-5 through multiple buffer guide rods 23-4.

[0099] like Figure 17As shown, in the above embodiment, preferably, the kraft paper hopper 23-2 includes a base 600 and a bottom plate 700 disposed thereon; the bottom plate 700 is provided with two sets of fixed baffles 800 and two sets of centering baffles 900, which together form the hopper; the centering baffles 900 are arranged adjacent to the fixed baffles 800; the centering baffles 900 are L-shaped, and their horizontal section is connected to the bottom plate 700 through a locking handle 1000. Loosening the locking handle 1000 can adjust the position of the centering baffles 900 to facilitate workers in placing kraft paper 300 and ensure that the placement position of multiple batches of kraft paper 300 remains consistent; a photoelectric switch 23-6 is provided at the bottom of the hopper of the kraft paper hopper 23-2, which is used to detect whether the kraft paper 300 in the hopper is exhausted. When the kraft paper 300 in the hopper is exhausted, the yellow light of the equipment flashes to remind the worker to replenish the material.

[0100] like Figures 19-20 As shown, in the above embodiment, preferably, the part transfer unit 26 includes a third dual-axis motion module 26-1, the X-axis moving part of the third dual-axis motion module 26-1 extends toward the traction cutting unit 14, and the Z-axis moving part of the third dual-axis motion module 26-1 is equipped with a gripping mechanism 26-2 for gripping carbon fiber multifilament samples.

[0101] In the above embodiment, preferably, the part transfer unit 26 further includes a frame, one end of which is fixed to the surface of the profile frame base plate of the second frame 21 and positioned by a positioning pin. The other end is placed on the ground and is equipped with adjustable feet at the bottom.

[0102] In the above embodiments, preferably, the gripping mechanism 26-2 is composed of two opposing gripper cylinders, the gripper head of which is made of rubber.

[0103] like Figure 21-22 As shown, in the above embodiment, preferably, the gluing unit 25 includes a second single-axis motion module 25-1, which is mounted across the frame above the first single-axis motion module 22-1. The moving part of the module is equipped with a gluing part 25-2. The gluing part 25-2 includes a screw valve fixing plate 25-2-1, a two-component screw valve 25-2-2, a static mixing tube 25-2-3, and a glue dispensing needle 25-2-4. The screw valve fixing plate 25-2-1 is fixed on the moving part of the second single-axis motion module 25-1. The two-component screw valve 25-2-2, the static mixing tube 25-2-3, and the glue dispensing needle 25-2-4 are arranged sequentially from top to bottom on the screw valve fixing plate 25-2-1. The second single-axis motion module 25-1 drives the gluing part 25-2 to move along a preset trajectory to achieve gluing on a preset surface position of the kraft paper 300. In this embodiment, the dispensing needle 25-2-4 is fixed to the screw valve fixing plate 25-2-1 by the needle fixing bracket 25-2-5.

[0104] In the above embodiment, preferably, the two-component screw valve 25-2-2 is equipped with two 500cc Teflon dispensing syringes, each with a φ45mm nozzle, for adding component A and component B respectively. A level gauge is mounted on the outer surface of the dispensing syringe; when the glue level in the syringe is too low, a yellow light flashes, prompting the operator to replenish the material. The dispensing syringes are made of Teflon for its corrosion resistance. Inside the two-component screw valve 25-2-2, components A and B are completely separated, preventing glue solidification within the valve.

[0105] In the above embodiment, preferably, the static mixing tube 25-2-3 has a double-helix structure to ensure thorough mixing of materials A and B during flow. In this embodiment, the dispensing amount and the mixing ratio of materials A and B are set by parameters. The adhesive application trajectory 400 follows a programmed trajectory. The adhesive application width and thickness can be set (e.g., the adhesive application trajectory 400...). Figure 23 As shown, the adhesive application width is 3mm and the thickness is 1mm.

[0106] In the above embodiments, preferably, a control module is also included. The pultrusion module 1 and the coating module 2 are electrically connected to the control module. Specifically, the yarn frame unit 11, the impregnation unit 12, the curing unit 13, and the traction cutting unit 14 in the pultrusion module 1 are electrically connected to the control module. The positioning tooling transfer unit 22, the pallet transfer unit 24, the kraft paper transfer unit 23, the coating unit 25, and the part transfer unit 26 in the coating module 2 are electrically connected to the control module, so as to coordinate the operation of each unit and monitor the operation of each unit through the control module, thereby realizing the automated preparation of carbon fiber multifilament.

[0107] like Figure 25 As shown, an automated method for preparing carbon fiber multifilament tensile test specimens according to the present invention, applied to the aforementioned automated equipment for preparing carbon fiber multifilament tensile test specimens, includes:

[0108] The carbon fiber multifilament spool is installed in the yarn frame unit 11 of the pultrusion module 1. The yarn frame unit 11 is adjusted to maintain the tension of the multifilament and monitors the status of the multifilament simultaneously. The multifilament is then conveyed to the impregnation unit 12.

[0109] Specifically, the yarn spool wrapped with carbon fiber multifilament is installed in the yarn frame unit 11 of the pultrusion module 1. The yarn frame unit 11 maintains the tension during the multifilament conveying process consistent with the set value through closed-loop feedback adjustment of the magnetic powder brake 11-4 and the tension sensor 11-2. The yarn breakage detection sensor 11-3 synchronously monitors the multifilament status. After tension adjustment, the multifilament is conveyed to the impregnation unit 12.

[0110] The carbon fiber multifilament is impregnated with adhesive solution by the impregnation unit 12, and excess adhesive solution is removed by the extrusion roller group 12-5 of the impregnation unit 12 to control the amount of impregnation. The excess adhesive solution is recycled.

[0111] Specifically, the multifilament enters the impregnation tank 12-1 of the impregnation unit 12, is guided by the impregnation roller 12-4 to be fully impregnated with the resin, and then the excess resin is squeezed out by the adjustable-pitch extrusion roller group 12-5 to control the amount of impregnation. The excess resin flows back to the resin return tank 12-2 for recycling. The heated resin flowing out during the curing process is collected separately by the resin return tank 12-2 to avoid mixing with the unheated resin.

[0112] After being impregnated with resin, the carbon fiber multifilaments undergo pre-curing and full curing sequentially via curing unit 13.

[0113] Specifically, the resin-impregnated multifilament enters the curing unit 13, where it is first pre-cured and shaped by a temperature-controlled curing mold 13-1, and then sent to the oven 13-2 to complete the complete curing of the resin. The waste gas generated during the curing process is treated by a waste gas collection device.

[0114] The cured carbon fiber multifilament is moved by the traction and cutting unit 14 and cut into carbon fiber multifilament samples according to the preset length. The carbon fiber multifilament samples are then transported to the preset position.

[0115] Specifically, the cured multifilament is continuously moved by the upper traction roller 14-1 and the lower traction roller 14-2 of the traction and cutting unit 14. The cutting part cuts the multifilament sample to a preset length, and the sample is transported to the designated position through the discharge part 14-6.

[0116] The positioning fixture transfer unit 22 of the glue application module 2 drives the positioning fixture 3 to the pallet transfer station 5, and the pallet transfer unit 24 grabs the pallet 200 from the pallet hopper 24-2 and places it in the positioning fixture 3 for fixation.

[0117] Specifically, the positioning fixture transfer unit 22 of the glue application module 2 drives the positioning fixture 3 to move to the pallet transfer station 5. The pallet transfer unit 24 grabs the pallet 200 from the pallet hopper 24-2 and transfers it to the pallet positioning groove 3-1 of the positioning fixture 3. The positioning fixture 3 fixes the pallet 200 by clamping cylinder 3-2.

[0118] Positioning fixture 3 moves pallet 200 to kraft paper transfer station 6, and kraft paper transfer unit 23 grabs kraft paper from kraft paper hopper and places it at the designated position on pallet 200.

[0119] Positioning fixture 3 drives pallet 200 to glue application station 7. Glue application unit 25 mixes resin liquid according to preset parameters and applies it to the surface of kraft paper 300 along preset trajectory.

[0120] Positioning fixture 3 to part transfer station 8, part transfer unit 26 grabs carbon fiber multifilament sample at traction cutting unit 14 and places it on coated kraft paper 300.

[0121] Positioning fixture 3 returns to kraft paper transfer station 6, and kraft paper transfer unit 23 grabs kraft paper again and places it on top of carbon fiber multifilament sample.

[0122] Specifically, the positioning fixture 3 moves to the part transfer station 8, the part transfer unit 26 picks up the cut multifilament sample and places it in the designated position on the glued kraft paper 300; the positioning fixture 3 returns to the kraft paper transfer station 6, the kraft paper transfer unit 23 picks up the kraft paper 300 again and lays it on top of the sample to form a reinforcing sheet bonding structure.

[0123] Positioning fixture 3 moves the prepared multifilament sample to manual material handling station 4, where a manual person removes the tray 200 containing the multifilament sample (e.g., ...). Figure 24 The diagram shown is a schematic diagram of the finished product sample structure.

[0124] like Figure 24 As shown, in the above embodiment, preferably, the prepared multifilament sample includes a carbon fiber bundle / carbon fiber multifilament strip 100 composed of several single filament bundles 100-1 arranged side by side, and kraft paper 300 pasted on the upper and lower ends of the carbon fiber bundle / carbon fiber multifilament strip 100 as reinforcing sheets. That is, two kraft papers 300 are respectively pasted on both ends of the carbon fiber bundle / carbon fiber multifilament strip 100 in the thickness direction. After the reinforcing sheets are pasted on both ends of the carbon fiber bundle / carbon fiber multifilament strip 100 in the length direction, a kraft paper 300-resin 500-carbon fiber bundle / carbon fiber multifilament strip 100-resin 500-kraft paper 300 structure is formed in the thickness direction.

[0125] The advantages of this invention are:

[0126] This invention, through an integrated design of "pultrusion module 1 + adhesive coating module 2," achieves fully automated and continuous operation of the entire process, from tension control and unwinding of carbon fiber multifilaments, quantitative adhesive impregnation, continuous curing, traction cutting to automatic application of reinforcing sheets. It effectively solves the core problems of existing manual and equipment-assisted sample preparation, such as fragmented processes, excessive manual intervention, uncontrollable process parameters, poor sample quality consistency, and low sample preparation efficiency. It meets the needs of batch and continuous production while also considering safety and environmental protection characteristics.

[0127] This invention integrates the entire sample preparation process, including tension control and fiber feeding, quantitative resin impregnation, continuous curing, traction cutting, pallet transfer, kraft paper laying, resin coating, and sample bonding, into a continuous process through the coordinated connection of pultrusion module 1 and coating module 2. It also monitors key process parameters such as tension, mold temperature, oven temperature, traction rate, resin coating length, and coating amount in real time, completely breaking the limitations of existing equipment in assisted sample preparation where curing and bonding rely on manual labor and the processes are disconnected. This significantly shortens the sample preparation cycle and meets the needs of mass production.

[0128] This invention achieves stable tension application to carbon fiber multifilaments throughout the entire sample preparation process through closed-loop adjustment of the magnetic powder brake 11-4 and tension sensor 11-2 in the yarn frame unit 11, avoiding tension release caused by process interruption. At the same time, relying on the standardized equipment structure, the invention ensures the consistency of process conditions such as tension, impregnation time, and curing parameters by precisely controlling the amount of resin impregnation with an adjustable extrusion roller, adjusting the curing temperature in stages with the curing mold 13-1 and the oven 13-2, and precisely cutting the cutting parts to the preset length. This completely solves the problem of large sample dispersion caused by manual sample preparation relying on the operator's experience, and provides a guarantee for the accuracy of tensile performance testing.

[0129] This invention relies on the coordinated operation of each unit in the gluing module 2. The motion module of the pallet transfer unit 24 and the kraft paper transfer unit 23, along with the suction cup, completes the precise transfer of materials. The part transfer unit 26 realizes the positioning and bonding of the sample. The gluing unit 25 uses a two-component screw valve 25-2-2 and a double spiral static mixing tube to realize the automatic and continuous coating of resin and precise control of the glue output and mixing ratio. This avoids the accuracy deviation of manual patching, reduces glue waste, and ensures the bonding strength between the reinforcing sheet and the sample.

[0130] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. 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 automated preparation device for tensile performance test specimens of carbon fiber multifilament, characterized in that, include: The pultrusion module includes a yarn frame unit, an impregnation unit, a curing unit and a traction cutting unit arranged sequentially along the carbon fiber bundle conveying direction. The traction cutting unit is used to drive the carbon fiber multifilament to move and cut it to a preset length to obtain a carbon fiber multifilament sample. The gluing module includes a positioning fixture transfer unit, a pallet transfer unit, a kraft paper transfer unit, a gluing unit, and a part transfer unit. The positioning fixture transfer unit carries the pallet and moves it between the workstations of each unit. The pallet transfer unit picks up the pallet from the pallet hopper and transfers it to the positioning fixture of the positioning fixture transfer unit. The kraft paper transfer unit picks up kraft paper from the kraft paper hopper and transfers it to a designated position on the pallet. The gluing unit applies resin adhesive to the surface of the kraft paper on the pallet according to preset parameters. The part transfer unit picks up the carbon fiber multifilament sample cut by the traction cutting unit and transfers it to a designated position on the glued kraft paper.

2. The automated preparation equipment for carbon fiber multifilament tensile performance specimens according to claim 1, characterized in that, The pultrusion module also includes a first frame, on which a yarn frame unit, an impregnation unit, a curing unit and a traction cutting unit are sequentially arranged along the carbon fiber multifilament conveying direction on the table surface of the first frame; The yarn frame unit includes a hand-operated expansion shaft, a tension sensor, and a yarn breakage detection sensor arranged in sequence. A magnetic powder brake is installed at one end of the hand-operated expansion shaft. A yarn spool with carbon fiber bundles wound on the hand-operated expansion shaft is installed on the hand-operated expansion shaft. The traction cutting unit cooperates with the rotation of the hand-operated expansion shaft to sequentially transport the carbon fiber bundles to the tension sensor and the impregnation unit. The yarn breakage detection sensor is used for yarn breakage alarm.

3. The automated preparation equipment for carbon fiber multifilament tensile performance specimens according to claim 2, characterized in that, The impregnation unit includes an impregnation tank and a resin return tank arranged sequentially along the carbon fiber bundle conveying direction; the impregnation tank is filled with resin liquid, and at least one set of impregnation rollers are arranged at intervals in the impregnation tank, and an extrusion roller group is provided at the end of the impregnation tank; the extrusion rollers include two extrusion rollers arranged vertically, and the two extrusion rollers respectively abut against the carbon fiber bundle and apply pressure to the carbon fiber bundle; the axial directions of the impregnation rollers and the extrusion rollers are both perpendicular to the carbon fiber bundle conveying direction. The carbon fiber bundle output by the tension sensor passes under the impregnation roller to achieve full impregnation. After impregnation, the carbon fiber bundle is extruded by the extrusion roller group and then transported to the curing unit. The excess adhesive generated by the extrusion is returned to the resin return tank.

4. The automated preparation equipment for carbon fiber multifilament tensile performance specimens according to claim 2, characterized in that, The curing unit includes a curing mold and an oven arranged sequentially along the carbon fiber bundle conveying direction, and the curing mold is equipped with a heating plate. After being impregnated by the impregnation unit, the carbon fiber bundles are sequentially conveyed to the traction and cutting unit through the curing mold and the oven. The curing mold is used to heat the adhesive on the carbon fiber bundles to accelerate the curing of the adhesive and ensure the shape of the carbon fiber bundles. The oven is used to cure the pre-cured and shaped carbon fiber bundles by heating.

5. The automated preparation equipment for carbon fiber multifilament tensile performance specimens according to claim 2, characterized in that, The traction cutting unit includes a fixed frame, with a traction part on the side of the fixed frame close to the impregnation unit and a cutting part and a discharge part on the side of the fixed frame away from the impregnation unit. The traction unit includes an upper traction roller and a lower traction roller arranged vertically. The upper traction roller is driven by a cylinder to move up and down to cooperate with the lower traction roller to adhere to the carbon fiber bundle and drive the carbon fiber bundle to be conveyed to the discharge unit. The fixing frame is provided with through holes for the carbon fiber bundle to pass through. The cutting unit cuts the carbon fiber bundle to a preset length to obtain a carbon fiber multifilament sample.

6. The automated preparation equipment for carbon fiber multifilament tensile performance specimens according to claim 1, characterized in that, The adhesive application module also includes a second frame, on the table of which a positioning tooling transfer unit is provided; The positioning fixture transfer unit includes a first single-axis motion module laid along the length of the second frame. A positioning fixture is installed on the moving part of the first single-axis motion module. The positioning fixture is provided with a pallet positioning groove for bearing and limiting the fixing of the pallet. The first single-axis motion module sequentially forms a pallet transfer station, a kraft paper transfer station, a glue application station and a part transfer station along the moving direction of the moving part. The second frame table is sequentially provided with pallet transfer units, kraft paper transfer units, glue application units and part transfer units corresponding to each station.

7. The automated preparation equipment for carbon fiber multifilament tensile performance specimens according to claim 6, characterized in that, The pallet transfer unit includes a first dual-axis motion module. The X-axis moving part of the first dual-axis motion module is horizontally arranged above the first single-axis motion module. The Z-axis moving part of the first dual-axis motion module is equipped with a first suction cup mounting plate. The bottom of the first suction cup mounting plate is provided with a first vacuum suction cup for gripping the pallet from the pallet hopper. The kraft paper transfer unit includes a second dual-axis motion module. The X-axis moving part of the second dual-axis motion module is horizontally arranged above the first single-axis motion module. The Z-axis moving part of the second dual-axis motion module is equipped with a second suction cup mounting plate. The bottom of the second suction cup mounting plate is provided with a second vacuum suction cup for gripping the kraft paper from the kraft paper hopper. The part transfer unit includes a third biaxial motion module. The X-axis moving part of the third biaxial motion module extends toward the traction cutting unit, and the Z-axis moving part of the third biaxial motion module is equipped with a gripping mechanism for gripping carbon fiber multifilament samples.

8. The automated preparation equipment for carbon fiber multifilament tensile performance specimens according to claim 6, characterized in that, The glue application unit includes a second single-axis motion module, which is mounted across the first single-axis motion module via a frame, and a glue application part is installed on its moving part; the glue application part includes a screw valve fixing plate, a two-component screw valve, a static mixing tube and a glue dispensing needle, and the two-component screw valve, the static mixing tube and the glue dispensing needle are arranged sequentially from top to bottom on the screw valve fixing plate; The static mixing tube has a double helix structure; the second single-axis motion module drives the coating part to move along a preset trajectory to apply glue to the preset surface position of the kraft paper.

9. The automated preparation equipment for carbon fiber multifilament tensile performance specimens according to claim 1, characterized in that, Both the kraft paper hopper and the pallet hopper include a base and a bottom plate disposed thereon; the bottom plate is provided with two sets of fixed baffles and two sets of centering baffles, which together enclose the hopper to form a hopper; and the centering baffles are arranged adjacent to the fixed baffles; the centering baffles are L-shaped, and their horizontal sections are connected to the bottom plate through a locking handle, and the position of the centering baffles can be adjusted by loosening the locking handle; A photoelectric switch is installed at the bottom of the kraft paper hopper, which is used to detect whether the kraft paper in the hopper is exhausted. The bottom of the pallet hopper is equipped with a proximity switch, which is used to detect whether the pallets in the hopper are exhausted.

10. An automated method for preparing carbon fiber multifilament tensile test specimens, which is applied to the automated preparation equipment for carbon fiber multifilament tensile test specimens according to any one of claims 1 to 9, characterized in that, include: The carbon fiber multifilament spool is installed in the yarn frame unit of the pultrusion module. The yarn frame unit is adjusted to maintain the stability of the multifilament tension and monitors the multifilament status simultaneously. The multifilament is then conveyed to the impregnation unit. Carbon fiber multifilaments are impregnated with adhesive solution in the impregnation unit, and excess adhesive solution is removed by the extrusion roller group of the impregnation unit to control the amount of adhesive impregnation. The excess adhesive solution is recycled. After being impregnated with resin, the carbon fiber multifilaments undergo pre-curing and full curing sequentially through a curing unit. The cured carbon fiber multifilament is moved by the traction cutting unit and cut to a preset length to obtain a carbon fiber multifilament sample. The carbon fiber multifilament sample is then transported to a preset position. The positioning fixture transfer unit of the glue application module drives the positioning fixture to the pallet transfer station, and the pallet transfer unit grabs the pallet from the pallet hopper and places it in the positioning fixture for fixation. The positioning fixture moves the pallet to the kraft paper transfer station, where the kraft paper transfer unit grabs kraft paper from the kraft paper hopper and places it at the designated position on the pallet. The positioning fixture moves the pallet to the gluing station, and the gluing unit mixes the resin according to preset parameters and then applies it to the surface of the kraft paper along a preset trajectory. Position the tooling to the part transfer station, and the part transfer unit grabs the carbon fiber multifilament sample from the traction and cutting unit and places it on the coated kraft paper. The positioning fixture returns to the kraft paper transfer station, and the kraft paper transfer unit grabs the kraft paper again and places it on top of the carbon fiber multifilament sample. The positioning fixture moves the prepared multifilament sample to the material handling station, where the tray with the multifilament sample is manually removed.

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