Carbon fiber multifilament tensile property test sample preparation device and method of using same

Abstract

The present application relates to carbon fiber multifilament tensile property test technical field, especially in kind of carbon fiber multifilament tensile property test sample preparation device and its using method.Carbon fiber multifilament tensile property test sample preparation device includes: silk device for conveying tow and adjusting the tension of tow in the conveying process;Glue dipping device is used to adhere tow glue and detect the concentration of glue at preset temperature and adjust the concentration of unqualified glue;Solidification device is used to heat the sizing of tow;Cutting device is used to cut the tow to the predetermined length;Patch device is used to patch the tow.The present application can realize automatic sampling, to improve the efficiency of sample preparation and sample quality, also can control the tension of tow, to ensure the consistency and stability of test results;And the concentration of glue is monitored on line and the unqualified glue is adjusted, so that the concentration of glue reaches the sampling standard, to further improve the sample quality.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber multifilament tensile property testing technology, and in particular to a sample preparation device for carbon fiber multifilament tensile property testing and its usage method. Background Technology

[0002] Carbon fiber is a high-performance fiber with excellent properties such as high specific modulus, high specific strength, and strong fatigue resistance, and is widely used in wind power, aerospace, sporting goods, and transportation. The tensile properties of carbon fiber are a crucial factor affecting the performance and quality of related products; therefore, the tensile strength of carbon fiber multifilament is an important mechanical property indicator for evaluating fiber performance. Tensile property testing of carbon fiber multifilament typically involves manual sample preparation, which has the following drawbacks:

[0003] 1. The tension control of the filament bundle is greatly affected by human factors, and the inconsistent tension of the sample affects the consistency and stability of the test results;

[0004] 2. When manually preparing the adhesive solution and performing the dipping operation, it is impossible to detect the adhesive concentration online. During the dipping operation, it is impossible to monitor and adjust the parameters of adhesive concentration and temperature. Deviations in adhesive concentration and temperature will affect the dipping effect. Current methods mostly involve manual measurement at intervals during the dipping operation, which is cumbersome and inefficient.

[0005] 3. When manually removing excess adhesive from carbon fiber multifilaments after impregnation, the amount of adhesive can vary greatly due to differences in the operator's strength and experience, leading to deviations in the test results.

[0006] 4. When cutting the resin-impregnated samples, the manual operation is inconsistent. Most of them are done with simple tools such as scissors or cutters, resulting in defects such as inconsistent sample lengths and uneven cuts.

[0007] 5. When applying reinforcing sheets, manual application requires manual control of the spacing between sheets, the width of the sheets, and whether the sheet ends are perpendicular to the carbon fiber multifilaments. Due to the complexity of the operation and the operator's skill level, application errors are prone to occur, which will affect the accuracy of the test results. Moreover, the application process is time-consuming, labor-intensive, and inefficient.

[0008] 6. The sample preparation process involves multiple steps, resulting in low overall process integration, numerous steps, and significant susceptibility to human factors.

[0009] 7. When preparing samples manually, trace amounts of organic reagents may be encountered, and long-term accumulation may increase the risk of occupational diseases. Summary of the Invention

[0010] In view of this, the purpose of this application is to provide a sample preparation device and its method for testing the tensile properties of carbon fiber multifilament, so as to solve the problem that the quality of the required sample for the existing carbon fiber multifilament tensile property test cannot be guaranteed, and the tension and adhesive parameters cannot be controlled, which leads to a decrease in the accuracy of the test results of the carbon fiber multifilament tensile property test.

[0011] The first aspect of this invention provides a sample preparation device for testing the tensile properties of carbon fiber multifilaments, wherein the sample preparation device comprises:

[0012] A yarn feeding device includes a yarn feeding component and a first tension adjusting component; a coiled yarn bundle is sleeved on the side wall of the yarn feeding component; the yarn feeding component rotates to unwind the coiled yarn bundle and convey it to the first tension adjusting component; the rotation speed of the first tension adjusting component and the rotation speed of the yarn feeding component form a speed difference to adjust the tension of the yarn bundle during the conveying process.

[0013] An adhesive dipping device, located downstream of the feeding device, is used to adhere adhesive to the filament bundles conveyed by the feeding device. The adhesive dipping device includes an adhesive dipping tank and an adhesive detection and adjustment device connected to the adhesive dipping tank. The adhesive dipping tank contains the adhesive, and the filament bundles adhere to the adhesive during their conveying process in the adhesive dipping tank. A portion of the adhesive in the adhesive dipping tank can flow into the adhesive detection and adjustment device, enabling the adhesive detection and adjustment device to detect the concentration of the adhesive at a preset temperature and adjust the adhesive if the concentration is unqualified.

[0014] A curing device, located downstream of the impregnation device, is used to heat and shape the filaments adhered to the adhesive, thereby hardening the soft filaments.

[0015] A filament cutting device, located downstream of the curing device, is used to cut the cured filament bundle to a predetermined length;

[0016] A patching device is located downstream of the slicing device and is used to patch both ends of the slicing bundle along its length.

[0017] Preferably, the coiled filament bundle is formed as a filament spool with the filament bundle wound on it, and the filament unloading member is formed as a rotating shaft structure;

[0018] The yarn feeding component includes a drive part capable of driving the yarn bobbin to rotate and an expansion part capable of being inflated. The drive part has a groove formed on its side wall in the length direction for the expansion part to be inserted into. By adjusting the air pressure injected into the expansion part, the expansion volume of the expansion part is changed, so that the expansion part abuts against the inner wall of the yarn bobbin, thereby driving the yarn bobbin and the drive part to rotate synchronously.

[0019] Preferably, the wire feeding device further includes a support member connected to the wire feeding component;

[0020] The filament bundle includes multiple monofilaments, and multiple filament feeding members are provided. The support member is connected to multiple filament feeding members. At least some of the filament feeding members have different numbers of monofilaments in the filament bundle to prepare multifilament samples of different specifications. The first tension adjusting member is provided in a one-to-one correspondence with the filament feeding members. The tension of the filament bundle with different numbers of monofilaments is different. The more monofilaments there are, the greater the required tension.

[0021] Preferably, the filament feeding device further includes a filament separating member disposed between the filament feeding member and the first tension adjusting member. The filament separating member extends along the length direction of the filament feeding member and is provided with a plurality of filament feeding sections at intervals along the length direction of the filament separating member to form a conveying channel through which the filament bundles on different filament feeding members pass independently, so that filament bundles with different numbers of monofilaments are separated.

[0022] Preferably, the yarn feeding device further includes a guide assembly disposed between the yarn feeding member and the yarn separating member;

[0023] The guiding assembly includes a first guide member and a second guide member;

[0024] Multiple wire feeding components are arranged alternately in multiple columns along the vertical direction, and the projections of the multiple wire feeding components in the horizontal direction do not overlap; multiple first guide components are provided and are arranged one-to-one with the wire feeding components. The first guide components are arranged on the side of the wire feeding components, so that the wire bundles unwound from the wire feeding components are conveyed in the horizontal direction, and the wire bundles on the multiple wire feeding components are arranged in multiple rows.

[0025] The second guide is disposed between the first guide and the filament splitter. The second guide has a guide groove extending along the length direction of the filament splitter so that multiple filament bundles can pass through and extend to different filament feeding sections.

[0026] Multiple filament bundles arranged in multiple rows by the first guide member merge into one row when passing through the second guide member. The multiple filament bundles that merge into one row are spaced apart in the guide groove, such that each filament bundle corresponds to a different wire feeding section.

[0027] Preferably, the adhesive detection and adjustment device includes a temperature detection element, a temperature adjustment component, a concentration detection element, and a concentration adjustment component; the temperature detection element extends into the adhesive and is used to detect the temperature of the adhesive.

[0028] The concentration of the adhesive solution has a preset concentration range at a standard temperature, and the temperature regulating component includes a heating element and a cooling element that can extend into the adhesive solution;

[0029] When the temperature parameter detected by the temperature sensor is lower than the standard temperature, the heating element is activated to heat the adhesive until the temperature of the adhesive reaches the standard temperature; when the temperature parameter detected by the temperature sensor is higher than the standard temperature, the cooling element is activated to cool the adhesive until the temperature of the adhesive reaches the standard temperature.

[0030] The concentration of the adhesive solution is directly proportional to its density, and the concentration detection device is used to detect the density of the adhesive solution.

[0031] The concentration adjustment component includes a diluent additive and a thickener additive component. The thickener additive component includes a resin additive and a curing agent additive. The mass ratio of the resin additive and the curing agent additive to the adhesive is 10:2 to 5.

[0032] Preferably, the impregnation device further includes a liquid level detection element disposed in the impregnation tank. The liquid level detection element can detect the liquid level height of the adhesive in the impregnation tank and feed the parameter back to the adhesive detection and adjustment device. The adhesive detection and adjustment device determines the volume of the adhesive in the impregnation tank based on the liquid level height and the size and shape of the impregnation tank.

[0033] The adhesive solution continuously circulates in the dipping tank and the adhesive solution detection and adjustment device, so that the adhesive solution detection and adjustment device can detect and adjust the adhesive solution in the dipping tank in real time.

[0034] When the concentration of the adhesive solution extracted by the adhesive solution detection and adjustment device is higher than the preset concentration range, the diluent additive adds material to the adhesive solution;

[0035] The formula for the volume V1 of material added to the adhesive by the diluent additive is:

[0036]

[0037] In the formula, ρ 胶 The density of the adhesive solution as detected by the concentration detection device;

[0038] ρ 设1 It is the maximum or median value within the preset range;

[0039] ρ1 is the density of the material in the diluent additive;

[0040] V0 is the volume of the adhesive solution in the impregnation tank;

[0041] When the concentration of the adhesive solution extracted by the adhesive solution detection and adjustment device is lower than the preset concentration range, the thickener addition component adds material to the adhesive solution;

[0042] The formula for the volume V2 of material added to the adhesive by the thickener addition component is:

[0043]

[0044] In the formula, ρ 设2 It is the minimum or intermediate value within the preset range;

[0045] ρ2 is the concentration of the material in the resin additive and the material in the curing agent additive after mixing.

[0046] Preferably, the liquid level detection element has a liquid level warning value. When the liquid level of the adhesive in the impregnation tank is lower than the liquid level warning value, the liquid level detection element feeds back to the adhesive detection and adjustment device, so that the diluent additive, the resin additive and the curing agent additive are added at a mass ratio of 10-15:10:2-5 and mixed to form a new adhesive, so as to replenish the adhesive in the impregnation tank.

[0047] Preferably, the output end of the adhesive detection and adjustment device is provided with a switch element for controlling whether the adhesive in the adhesive detection and adjustment device is delivered to the impregnation tank;

[0048] When the concentration detection device detects that the concentration of the adhesive solution is within the preset concentration range, the concentration adjustment component is not activated, and the on / off component is opened, so that the adhesive solution is directly transported back into the impregnation tank.

[0049] When the concentration detection device detects that the concentration of the adhesive solution is not within the preset concentration range, the switch is closed until the concentration adjustment component adjusts the concentration of the adhesive solution to within the preset concentration range. Then the switch is opened, allowing the adjusted adhesive solution to be transported back into the impregnation tank.

[0050] Preferably, the impregnation apparatus further includes a conveying assembly disposed within the impregnation tank and an extrusion component disposed downstream of the conveying assembly;

[0051] The conveying assembly includes a plurality of conveying shafts spaced apart along the conveying path of the filament bundle. The filament bundle conforms to the sidewall of a portion of each conveying shaft. Rotation of the conveying shaft can drive the filament bundle to move along its conveying direction.

[0052] In the conveying assembly, at least a portion of the conveying shaft is disposed below the liquid surface of the adhesive, so that the filaments can adhere to the adhesive during the conveying process. The conveying shaft disposed at the end of the conveying assembly is disposed above the liquid surface of the adhesive, so that the filaments leave the adhesive and move to the extruder.

[0053] The extrusion member is disposed above the liquid surface of the adhesive. The extrusion member has two extrusion portions respectively disposed at both ends in the thickness direction of the filament bundle. The two extrusion portions abut against the filament bundle. When the filament bundle passes through the extrusion member, the two extrusion portions squeeze the two sides of the filament bundle in the thickness direction to remove excess adhesive from the filament bundle. The adhesive removed by the extrusion portions flows back to the impregnation tank.

[0054] Preferably, the curing device includes a heating element and an air outlet element corresponding to the heating element, wherein the heating element and the air outlet element are disposed at both ends in the thickness direction of the filament bundle;

[0055] Multiple heating elements and multiple air outlets are provided, and the multiple heating elements and multiple air outlets are respectively arranged at intervals along the conveying path of the filament bundle;

[0056] Along the conveying direction of the filament bundle, the air volume of the air outlet decreases sequentially; the plurality of heating elements form a variable temperature zone and a constant temperature zone, and along the conveying direction of the filament bundle, the heat generation of the heating element located in the variable temperature zone increases sequentially, and the constant temperature zone is located downstream of the variable temperature zone.

[0057] Preferably, the slicing device includes a cutting platform and a cutter and a filament detection element disposed toward the cutting platform;

[0058] The cutting platform has a conveying groove extending along the conveying direction of the filament bundle to guide the conveying path of the filament bundle, so that the filament bundle moves in the conveying groove toward the direction of the patching device; the cutter is disposed at the inlet end of the conveying groove along the conveying direction of the filament bundle, and the filament bundle detection element is disposed at the outlet end of the conveying groove.

[0059] The cutter can move toward the cutting platform to cut the cured filament bundle and form a slit between the uncut and cut filament bundles. The uncut filament bundles push the cut filament bundles to continue moving in the conveying groove. When the filament bundle detection element detects the slit, the filament bundle detection element feeds a signal back to the cutter, causing the cutter to move toward the cutting platform to cut the filament bundles and form a new slit.

[0060] Preferably, the shredding device further includes a clamping device disposed at the outlet end of the conveying trough and a sample collection device disposed downstream of the cutting platform;

[0061] When the filament detection element detects the cut, the clamping element moves toward the cutting platform before the cutter moves and presses the filament toward the conveying groove to stop the filament from moving; when the cutter cuts the stopped filament, the clamping element leaves the cutting platform, so that the cut filament enters the sample collector under the push of the uncut filament.

[0062] Preferably, the patching device includes a conveyor and a reinforcing sheet unloading assembly, an adhesive spraying assembly, and a filament unloading assembly disposed above the conveyor;

[0063] The reinforcing sheet unloading assembly includes a first reinforcing sheet unloading component and a second reinforcing sheet unloading component spaced apart along the conveying direction of the conveying component. The filament unloading component is disposed between the first reinforcing sheet unloading component and the second reinforcing sheet unloading component. Both the first reinforcing sheet unloading component and the second reinforcing sheet unloading component include two unloading portions corresponding to the two ends of the cut filament in the length direction.

[0064] The adhesive spraying component is disposed between the first reinforcing sheet unloading component and the filament unloading component to apply adhesive to the first reinforcing sheet falling from the first reinforcing sheet unloading component onto the conveying component; when the adhesive-coated first reinforcing sheet is conveyed to the bottom of the filament unloading component, the cut filament falls and adheres to the top of the adhesive-coated first reinforcing sheet; when the filament adhered to the first reinforcing sheet is conveyed to the bottom of the second reinforcing sheet, the second reinforcing sheet falling from the second reinforcing sheet unloading component covers the top of the first reinforcing sheet, so that both ends of the filament in the length direction are adhered between the first reinforcing sheet and the second reinforcing sheet.

[0065] Preferably, the patching device further includes a pre-drying component disposed above the conveyor, the pre-drying component being disposed downstream of the second reinforcing sheet unloading component, the heat released by the pre-drying component being able to cure the adhesive-coated reinforcing sheet.

[0066] Preferably, the patching device further includes a curing assembly disposed downstream of the conveyor, the curing assembly including a curing platform and a heating plate disposed above the curing platform;

[0067] The conveyor transports the filament bundle with the first reinforcing sheet and the second reinforcing sheet attached to it to the top of the curing platform, so that the adhesive between the first reinforcing sheet and the second reinforcing sheet can be naturally dried and cured, or the heating plate moves toward the curing platform, so that the first reinforcing sheet and the second reinforcing sheet are clamped between the curing platform and the heating plate, and the heating plate can release heat to accelerate the curing of the adhesive.

[0068] The second aspect of the present invention provides a method for using a carbon fiber multifilament tensile performance test sample preparation device, which is applied to the carbon fiber multifilament tensile performance test sample preparation device described in any of the above technical solutions.

[0069] Before the carbon fiber multifilament tensile performance test sample preparation device is put into use, the fiber bundle is sequentially passed through the fiber feeding device, the resin impregnation device, the curing device and the fiber cutting device to form a defined conveying path;

[0070] After the carbon fiber multifilament tensile performance test sample preparation device is activated, the conveying components in the fiber feeding device, the resin impregnation device, the curing device, the fiber cutting device, and the patching device move to drive the fiber bundle along its conveying path, so that the fiber bundle completes the sample preparation process sequentially in each device.

[0071] At least some of the components with conveying functions in the filament feeding device, the resin impregnation device, and the curing device adjust the tension of the filament bundle during the conveying process;

[0072] The impregnation device monitors and controls the parameters of the adhesive solution adhering to the filaments in real time, so that the adhesive solution adhering to the filaments meets the sample requirements.

[0073] The curing device heats the filament bundles with the adhesive solution adhering to them, causing the filament bundles to cure; during the curing process, the curing effect of the sample is ensured by controlling parameters such as heating temperature and time.

[0074] The slicing device cuts the solidified filament bundle into multiple segments, ensuring that the cut edges of each segment of the filament bundle are flush.

[0075] The patching device automatically attaches reinforcing sheets to the segmented filament bundles and transports the reinforcing sheets-attached filament bundles to the test sampling location; during the transport process, the patching device can cure the adhesive on the reinforcing sheets to shorten the sample preparation time.

[0076] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0077] The carbon fiber multifilament tensile performance test sample preparation device of the present invention can control the tension of the fiber bundle while conveying the fiber bundle to ensure the consistency and stability of the test results; the glue impregnation device can monitor the concentration of the glue solution in real time and adjust the unqualified glue solution so that the concentration of the glue solution reaches the sample preparation standard, thereby improving the quality of the sample and improving the accuracy of the carbon fiber multifilament tensile performance test results.

[0078] Furthermore, the sample preparation device for carbon fiber multifilament tensile performance testing can automate the sample preparation process, making the sample preparation steps continuous and reducing the time consumed by process connections. This significantly reduces the time required for sample preparation. Moreover, the automated sample preparation process can greatly reduce the impact of human factors on the test results. While improving sample preparation efficiency, it also ensures that the samples are not affected by the operator's work experience or working status, thus guaranteeing the quality of the samples and reducing the coefficient of variation of the test data. This ensures that the test results are more scientific, reasonable, and convincing, and thus more realistically reflect the true performance of carbon fiber products.

[0079] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0080] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0081] Figure 1 A schematic diagram of the carbon fiber multifilament tensile property test sample preparation device provided in an embodiment of the present invention;

[0082] Figure 2 A schematic diagram of the fiber feeding device in the sample preparation apparatus for testing the tensile properties of carbon fiber multifilament provided in an embodiment of the present invention;

[0083] Figure 3 A schematic diagram of the impregnation device in the sample preparation apparatus for testing the tensile properties of carbon fiber multifilament provided in an embodiment of the present invention;

[0084] Figure 4 A schematic diagram of the adhesive detection and adjustment device in the carbon fiber multifilament tensile performance test sample preparation apparatus provided in an embodiment of the present invention;

[0085] Figure 5 A schematic diagram of the curing device in the carbon fiber multifilament tensile performance test sample preparation apparatus provided in an embodiment of the present invention;

[0086] Figure 6 A schematic diagram of the fiber cutting device in the carbon fiber multifilament tensile property test sample preparation device provided in the embodiments of the present invention;

[0087] Figure 7 A schematic diagram of the patching device in the carbon fiber multifilament tensile performance test sample preparation apparatus provided in an embodiment of the present invention;

[0088] Figure 8 A schematic diagram of the patching device in the carbon fiber multifilament tensile property test sample preparation device provided in an embodiment of the present invention, viewed from another perspective.

[0089] Figure 9 A schematic diagram of the fiber feeding component in the carbon fiber multifilament tensile property test sample preparation device provided in the embodiments of the present invention;

[0090] Figure 10 A schematic diagram of the fiber cutting process of the carbon fiber multifilament tensile property test sample preparation device provided in the embodiments of the present invention;

[0091] Figure 11 A schematic diagram of the sample preparation device for testing the tensile properties of carbon fiber multifilament provided in an embodiment of the present invention;

[0092] Figure 12 A schematic diagram of the fiber bundle patch of the carbon fiber multifilament tensile performance testing sample preparation device provided in an embodiment of the present invention;

[0093] Figure 13 A schematic diagram of the fiber bundle patch of the carbon multifilament tensile performance testing sample preparation device provided in an embodiment of the present invention from another perspective;

[0094] Figure 14 A schematic diagram of the equipment control system of the carbon fiber multifilament tensile performance test sample preparation device provided in an embodiment of the present invention.

[0095] Icons: 10-Fiber feeding device; 100-First tension adjusting component; 11-Fiber feeding component; 111-Drive unit; 112-Expansion unit; 12-Support component; 13-Fiber separating component; 141-First guide component; 142-Second guide component; 20-Impregnation device; 200-Second tension adjusting component; 21-Impregnation tank; 22-Adhesive solution detection and adjustment device; 221-Temperature detection component; 222-Concentration detection component; 223-Heating component; 224-Cooling component; 231-Diluent additive component; 232-Resin additive component; 233-Curing agent additive component; 24-Liquid level detection component; 25-Conveying assembly; 26-Extrusion component; 27-Adhesive suction pump; 28-On / off component; 29-Stirring component; 30-Curing device 300-Third tension adjustment component; 31-Heating component; 32-Air outlet component; 33-Temperature measuring component; 40-Skewing device; 41-Cutting platform; 411-Conveying trough; 42-Cutter; 43-Skew bundle detection component; 44-Pressure component; 45-Sample collection component; 451-Opening; 50-Patching device; 51-Conveying component; 52-Reinforcing sheet unloading assembly; 521-First reinforcing sheet unloading component; 522-Second reinforcing sheet unloading component; 53-Skew bundle unloading component; 531-Sampling component; 54-Adhesive spraying component; 55-Pre-drying component; 561-Curing platform; 562-Heating pressure plate; 60-Skew bundle; 61-Uncut skewed skew bundle; 62-Cut skew bundle; 63-Slit; 70-Reinforcing sheet. Detailed Implementation

[0096] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0097] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0098] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0099] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0100] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0101] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0102] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0103] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0104] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0105] According to a first aspect of the present invention, a sample preparation device for testing the tensile properties of carbon fiber multifilament includes a fiber feeding device 10, a resin impregnation device 20, a curing device 30, a fiber cutting device 40, and a patching device 50.

[0106] In this embodiment, as Figure 1 and Figure 2 As shown, the filament feeding device 10 includes a filament feeding component 11 and a first tension adjusting component 100. Specifically, a coiled filament bundle 60 is sleeved on the side wall of the filament feeding component 11. The filament feeding component 11 rotates to unwind the coiled filament bundle 60 and convey it to the first tension adjusting component 100. The rotational speed of the first tension adjusting component 100 and the rotational speed of the filament feeding component 11 form a speed difference to adjust the tension of the filament bundle 60 during the conveying process. The speed of the filament bundle 60 during the conveying process is 5 to 30 cm / min.

[0107] It should be noted that the filament bundle 60 is a carbon fiber filament bundle 60, with the unit being k. The filament bundle 60 is formed into a flat strip structure with a predetermined width. The filament bundle 60 includes multiple carbon fiber monofilaments. For example, a 1k filament bundle 60 means that it is composed of 1000 carbon fiber monofilaments. The tension of the filament bundle 60 varies depending on the number of monofilaments. The more monofilaments, the greater the required tension. In this embodiment, the tension parameters of 1k, 3k, and 6k filament bundles 60 are set to 100-500g; the tension parameter of 12k filament bundle 60 is set to 200-1000g; the tension parameter of 24k and above filament bundles 60 is set to 500-1500g; and the tension parameter of 48k and above filament bundles 60 is set to 2000-3500g.

[0108] In this embodiment, the coiled filament bundle 60 is formed as a filament bobbin with the filament bundle 60 wound on it, and the filament feeding member 11 is formed as a rotating shaft structure, specifically, as shown in... Figure 1 , Figure 2 and Figure 9 As shown, the wire feeding component 11 includes a drive part 111 capable of driving the wire spool to rotate and an expansion part 112 capable of being inflated. The drive part 111 has a groove formed on its side wall in the length direction for the expansion part 112 to be inserted. The expansion part 112 is formed of an elastic material, and its volume is changed by filling it with gas, thereby changing the radial dimension of the wire feeding component 11. The expansion volume of the expansion part 112 is changed by adjusting the air pressure filled into it, so that the expansion part 112 abuts against the inner wall of the wire spool, thereby driving the wire spool and the drive part 111 to rotate synchronously. In this embodiment, the expansion part 112 can be an air bladder. When preparing the sample, a wire spool with a wire bundle 60 of the required specifications is selected and placed on the outer wall of the wire feeding component 11.

[0109] In a preferred embodiment, such as Figure 1 and Figure 2 As shown, multiple expansion portions 112 are provided, and the multiple expansion portions 112 are arranged at intervals around the circumferential sidewall of the drive portion 111; for example, when two expansion portions 112 are provided, the two expansion portions 112 extend along the axial direction of the drive portion 111 and are symmetrically arranged at both ends of the drive portion 111 in the radial direction.

[0110] In this embodiment, as Figure 1 and Figure 2 As shown, the yarn feeding device 10 also includes a support member 12 connected to the yarn feeding member 11, which supports the yarn feeding member 11 and fixes its position, ensuring that the yarn feeding member 11 can rotate along its axis, thereby unwinding the yarn bundle 60 on the yarn spool and completing the yarn feeding operation. The support member 12 can be formed into a rod-shaped structure to reduce costs and prevent the support member 12 from obstructing the yarn feeding member 11, allowing the operator to observe the unwinding of the yarn bundle 60 by the yarn feeding member 11 at all times. When the yarn feeding member 11 malfunctions, the operator can promptly detect and handle the problem.

[0111] In this embodiment, as Figure 1 and Figure 2As shown, multiple filament feeding components 11 are provided to improve sample preparation efficiency and enable multiple filament feeding components 11 to work synchronously. The support component 12 is connected to the multiple filament feeding components 11 to support them. The multiple filament feeding components 11 are preferably arranged alternately in multiple columns along the vertical direction, such as two columns, and the projections of the multiple filament feeding components 11 in the horizontal direction do not overlap to ensure that the filament bundles 60 on different filament feeding components 11 will not entangle during the filament feeding process. Depending on the arrangement of the filament feeding components 11, the support component 12 can be formed into a triangular frame structure to improve the structural stability of the support component 12 and prevent the multiple filament feeding components 11 from interfering with each other.

[0112] In a preferred embodiment, such as Figure 1 and Figure 2 As shown, at least some of the filament bundles 60 on the filament feeding member 11 have different numbers of monofilaments to prepare multifilament samples of different specifications. Thus, multiple specifications of multifilament samples can be prepared with only one use of the sample preparation device, improving efficiency, reducing sample preparation costs, and further improving the detection efficiency and sample quantity of carbon fiber multifilament tensile performance test. In addition, the first tension adjustment member 100 is set in a one-to-one correspondence with the filament feeding member 11, so that the tension of multifilament samples of different specifications can be adjusted independently to ensure that the tension of each multifilament sample is within the above-mentioned set range, thereby improving the detection accuracy of carbon fiber multifilament tensile performance test.

[0113] In this embodiment, as Figure 1 and Figure 2 As shown, the first tension adjusting member 100 includes multiple conveying rollers, with the sidewalls of two adjacent conveying rollers fitting together. The filament bundle 60 passes between the two fitted conveying rollers. The conveying rollers clamp the filament bundle 60 and drive it to move along the conveying direction during their rotation.

[0114] In this embodiment, as Figure 1 and Figure 2 As shown, the wire feeding device 10 also includes a wire splitting member 13 disposed between the wire feeding member 11 and the first tension adjusting member 100. The wire splitting member 13 is formed into a strip structure and extends along the length direction of the wire feeding member 11. Multiple wire feeding sections are provided at intervals along the length direction of the wire splitting member 13 to form a conveying channel through which the wire bundles 60 on different wire feeding members 11 pass independently, so that the wire bundles 60 with different numbers of monofilaments are separated to avoid confusion of multifilament samples.

[0115] In this embodiment, as Figure 1 and Figure 2As shown, the structure of the filament separating member 13 can be such that its top has multiple protrusions spaced apart along the length of the filament separating member 13, and the filament feeding part is formed between two adjacent protrusions, the protrusions being able to separate different filament bundles 60; the structure of the filament separating member 13 can also be such that the main body of the filament separating member 13 has a perforated structure extending along the conveying direction of the filament bundle 60, the perforated structure corresponding to the filament feeding part. However, the structure of the filament separating member 13 is not limited to this, as long as it can form a conveying channel through which the filament bundles 60 on different filament feeding members 11 can pass independently.

[0116] In this embodiment, as Figure 1 and Figure 2 As shown, the yarn feeding device 10 also includes a guide assembly disposed between the yarn feeding member 11 and the yarn separating member 13, so that the conveying path of the yarn bundle 60 is clear and well-defined, and the conveying paths of different yarn bundles 60 interfere with each other. Specifically, the guide assembly includes a first guide member 141 and a second guide member 142. Multiple first guide members 141 are provided and are arranged one-to-one with the yarn feeding member 11. The first guide members 141 are disposed on the side of the yarn feeding member 11, so that the yarn bundles 60 unwound from the yarn feeding member 11 are conveyed horizontally. Multiple first guide members 141 are spaced apart vertically, and the yarn bundles 60 on the multiple yarn feeding members 11 are arranged in multiple rows, so that the movement paths of the multiple yarn bundles 60 do not interfere. In an embodiment, the first guide member 141 is preferably formed as a cylindrical structure to avoid the sharp edges scratching the yarn bundles 60, thereby preventing the yarn bundles 60 from becoming fuzzy or broken.

[0117] In this embodiment, as Figure 1 and Figure 2 As shown, the second guide 142 is disposed between the first guide 141 and the filament splitter 13. The second guide 142 has a guide groove extending along the length direction of the filament splitter 13, allowing multiple filament bundles 60 to pass through and extend to different feeding sections. Multiple filament bundles 60 arranged in multiple rows by the first guide 141 merge into one row when passing through the second guide 142. The merged filament bundles 60 are spaced apart in the guide groove, so that each filament bundle 60 corresponds to a different feeding section, thereby guiding the dispersed filament bundles 60 to the filament splitter 13. In this embodiment, the second guide 142 can be formed as an integral structure, with the guide groove forming an elongated hole structure penetrating the second guide 142. Alternatively, the second guide 142 is preferably formed as a split structure, with the guide groove formed at the gap of the split structure. The size of the guide groove can be adjusted by adjusting the spacing of the gaps to allow filament bundles 60 of different specifications to pass through.

[0118] In this embodiment, as Figure 1 , Figure 3 and Figure 4As shown, the impregnation device 20 is located downstream of the feeding device 10 and is used to adhere the adhesive to the fiber bundle 60 conveyed by the feeding device 10. The impregnation device 20 includes an impregnation tank 21 and an adhesive detection and adjustment device 22 connected to the impregnation tank 21. The impregnation tank 21 contains adhesive, and the fiber bundle 60 adheres to the adhesive during its conveying process in the impregnation tank 21. A portion of the adhesive in the impregnation tank 21 can flow into the adhesive detection and adjustment device 22, so that the adhesive detection and adjustment device 22 can detect the concentration of the adhesive at a preset temperature and adjust the adhesive with unqualified concentration, thereby ensuring that the adhesive adhered to the fiber bundle 60 meets the sample preparation requirements and improving the accuracy of the carbon fiber multifilament tensile performance test.

[0119] It should be noted that, in this embodiment, downstream refers to the direction of conveying the filament bundle 60. The device or component is disposed on the conveying path of the filament bundle 60 and is disposed at the position where the filament bundle 60 passes later.

[0120] In this embodiment, as Figure 1 and Figure 3 As shown, the impregnation tank 21 is formed into a box-like structure, as long as it has the function of holding adhesive liquid. The impregnation tank 21 preferably has sufficient length, such as a rectangular structure, with its length aligned with the conveying direction of the filament bundle 60, allowing the filament bundle 60 to be fully impregnated in the impregnation tank 21. The bottom of the impregnation tank 21 is preferably formed with an inward-curving structure (i.e., the sidewalls of the bottom of the impregnation tank 21 are inclined inwards) to increase the liquid level of the adhesive liquid and save adhesive liquid. Furthermore, the top of the impregnation tank 21 is provided with a sealing cover to provide isolation and protection. Specifically, the sealing cover is fastened to the impregnation tank 21, making the impregnation device 20 a closed structure, thus preventing adhesive liquid evaporation, saving costs, and also preventing volatile substances from entering the air and causing harm to the human body.

[0121] In addition, it should be noted that the sealing cover is detachably connected to the impregnation tank 21 to facilitate the debugging and maintenance of the impregnation device 20 and the sampling of the adhesive in the impregnation tank 21.

[0122] In this embodiment, as Figure 1 and Figure 3 As shown, a suction pump 27 is provided on the communication path between the dip tank 21 and the glue detection and adjustment device 22. The suction pump 27 can be an electric pump or a pneumatic pump, as long as it can draw the glue from the dip tank 21 into the glue detection device and draw the glue with qualified concentration from the glue detection device back into the dip tank 21.

[0123] It should be noted that, along the flow path of the adhesive in the dipping tank 21 and the adhesive detection and adjustment device 22, the outer wall of the dipping tank 21 has an outlet end and an inlet end for the adhesive to flow. The adhesive in the dipping tank 21 flows into the adhesive detection and adjustment device 22 from the outlet end, and the adhesive with qualified concentration or after concentration adjustment is completed returns to the dipping tank 21 from the inlet end. The outlet end and the inlet end are preferably set at both ends in the length direction of the dipping tank 21, so that the outlet end and the inlet end have a certain distance, so as to avoid the adhesive that has been adjusted for concentration entering the dipping tank 21 from the inlet end and then immediately flowing out from the outlet end.

[0124] In this embodiment, as Figure 1 , Figure 3 and Figure 4 As shown, the adhesive liquid detection and adjustment device 22 includes a temperature detection element 221 and a concentration detection element 222. The temperature detection element 221 extends into the adhesive liquid to detect its temperature. The concentration of the adhesive liquid is directly proportional to its density (i.e., a higher density indicates a higher concentration, and a lower density indicates a lower concentration). The concentration detection element 222 is used to detect the density of the adhesive liquid. Preferably, the temperature detection element 221 and the concentration detection element 222 are formed as an integral structure to improve the accuracy of the measurement. The integral structure of the temperature detection element 221 and the concentration detection element 222 can be a thermometric tuning fork densitometer. Alternatively, the temperature detection element 221 and the concentration detection element 222 can also be formed as two independent structures to measure the temperature and density of the adhesive liquid separately. The temperature detection element 221 uses a temperature sensor, and the concentration detection element 222 uses a densitometer.

[0125] In this embodiment, as Figure 1 , Figure 3 and Figure 4 As shown, the adhesive detection and adjustment device 22 further includes a temperature adjustment component and a concentration adjustment component. The adhesive concentration has a preset concentration range at a standard temperature. The temperature adjustment component includes a heating element 223 and a cooling element 224 that can extend into the adhesive. The heating element 223 can be a heating rod, and the cooling element 224 can be a compressed air refrigeration device. When the temperature parameter detected by the temperature detection element 221 is lower than the standard temperature, the heating element 223 is activated to heat the adhesive until the adhesive temperature reaches the standard temperature. When the temperature parameter detected by the temperature detection element 221 is higher than the standard temperature, the cooling element 224 is activated to cool the adhesive until the adhesive temperature reaches the standard temperature. In this embodiment, the standard temperature is 25±2℃, and the preset concentration range is 0.7~1.0g / cm³. 3 To ensure the quality of the resin impregnation.

[0126] In this embodiment, as Figure 1 , Figure 3 and Figure 4As shown, the concentration adjustment component includes a diluent additive 231 and a thickener additive component. The diluent additive 231 can reduce the concentration of the adhesive, and the thickener additive can increase the concentration of the adhesive. The thickener additive component includes a resin additive 232 and a curing agent additive 233. The diluent additive 231, resin additive 232, and curing agent additive 233 are disposed on the top of the adhesive detection and adjustment device 22 and are all formed into a can-shaped structure, so that they contain the corresponding materials (the material in the diluent additive 231 is diluent, and the material in the resin additive 233 is...). The material in component 232 is resin, and the material in component 233 is curing agent. Each outlet of the release agent additive, resin additive 232, and curing agent additive 233 is equipped with a filler switch, which is an electrically controlled switch. When the concentration detector 222 detects that the concentration of the adhesive is not within the preset concentration range, it transmits a signal to the corresponding filler switch, causing the filler switch to open. By controlling the opening time of the filler switch, the amount of release agent additive or resin additive 232 and curing agent additive 233 added to the adhesive can be controlled. In this embodiment, the mass ratio of the materials added to the adhesive by the resin additive 232 and curing agent additive 233 is 10:2 to 5.

[0127] In one implementation, such as Figure 1 , Figure 3 and Figure 4 As shown, the basic unit for adding the release agent or resin additive 232 and the curing agent additive 233 to the adhesive is 5 to 50 ml. After each addition, the concentration is tested. If the test is not qualified, the agent is added again. This forms a small-volume, multiple-time concentration adjustment method to avoid adding too much at once, which would directly cause the concentration of the adhesive to exceed the preset concentration range, thereby improving the efficiency of concentration adjustment.

[0128] In this embodiment, as Figure 1 , Figure 3 and Figure 4 As shown, the impregnation device 20 also includes a liquid level detection element 24 disposed in the impregnation tank 21. The liquid level detection element 24 can be a liquid level sensor. The liquid level detection element 24 can detect the liquid level height of the glue in the impregnation tank 21 and feed the parameter back to the glue detection and adjustment device 22. The glue detection and adjustment device 22 determines the volume of the glue in the impregnation tank 21 according to the liquid level height and the size and shape of the impregnation tank 21.

[0129] In a preferred embodiment, such as Figure 1 , Figure 3 and Figure 4 As shown, the adhesive solution continuously circulates in the impregnation tank 21 and the adhesive solution detection and adjustment device 22, so that the adhesive solution detection and adjustment device 22 can detect and adjust the adhesive solution in the impregnation tank 21 in real time, so as to improve the detection effect of adhesive solution concentration, ensure sample preparation quality, and thus improve the accuracy of carbon fiber multifilament tensile performance test.

[0130] Specifically, when the concentration of the adhesive solution extracted by the adhesive solution detection and adjustment device 22 is higher than the preset concentration range, the diluent additive 231 adds material to the adhesive solution. The formula for the volume V1 of the material added to the adhesive solution by the diluent additive 231 is:

[0131]

[0132] In the formula, ρ 胶 The density of the adhesive solution detected by the concentration detection device 222;

[0133] ρ 设1 The maximum or median value within the preset range;

[0134] ρ1 is the density of the material in diluent additive 231;

[0135] V0 is the volume of the adhesive solution in the impregnation tank 21;

[0136] When the concentration of the adhesive solution extracted by the adhesive solution detection and adjustment device 22 is lower than the preset concentration range, the thickener addition component adds material to the adhesive solution. The formula for the volume V2 of material added by the thickener addition component to the adhesive solution is:

[0137]

[0138] In the formula, ρ 设2 The minimum or median value within the preset range;

[0139] ρ2 is the concentration of the material in resin additive 232 and curing agent additive 233 after mixing.

[0140] The amount of adhesive added is controlled according to the formulas V1 and V2, so that the concentration of the adhesive can reach the preset concentration range with only one addition, thereby saving the time of adjusting the concentration of the adhesive and improving the adjustment efficiency of the concentration of the adhesive. After the concentration of the adhesive is adjusted in the adhesive detection and adjustment device 22, it is transported back to the impregnation tank 21 and the adhesive is re-extracted for detection and adjustment to achieve continuous circulation.

[0141] It should be noted that when ρ 设1 When ρ is the maximum value in the preset interval, 设2 Preferably, it is the minimum value within a preset range, so that the concentration of the unqualified adhesive solution is quickly adjusted back to within the preset concentration range; when ρ 设1 When ρ is the median value within the preset interval 设2 The preferred value is the middle value within a preset interval, i.e., ρ 设1 =ρ 设2 This is to facilitate calculations by the equipment control system.

[0142] It should be further noted that ρ1 and ρ2 are known parameters of the selected product.

[0143] Furthermore, in this embodiment, such as Figure 1 , Figure 3 and Figure 4 As shown, the liquid level detection element 24 has a liquid level warning value. When the liquid level of the adhesive in the dipping tank 21 is lower than the liquid level warning value, the liquid level detection element 24 feeds back to the adhesive detection and adjustment device 22, so that the diluent additive 231, resin additive 232 and curing agent additive 233 are added at a mass ratio of 10 to 15:10:2 to 5 and mixed to form a new adhesive solution to replenish the adhesive in the dipping tank 21.

[0144] It should be noted that, in this embodiment, before the impregnation process of the filament 60 begins, the adhesive solution in the impregnation tank 21 is mixed according to the mass ratio of diluent, resin and curing agent of 10-15:10:2-5, that is, the new adhesive mixed by the concentration adjustment component is consistent with the adhesive solution concentration in the initial state of the impregnation tank 21.

[0145] It should be further noted that when the adhesive solution in the initial state of the dipping tank 21 is mixed in other proportions, the addition ratio of the diluent additive 231, resin additive 232 and curing agent additive 233 during the replenishment of adhesive should be consistent with the ratio of the adhesive solution in the initial state of the dipping tank 21.

[0146] Furthermore, in this embodiment, such as Figure 1 , Figure 3 and Figure 4 As shown, the output end of the adhesive detection and adjustment device 22 is equipped with an on / off element 28, which can be an electrically controlled valve used to control the opening and closing of the conveying path from the adhesive detection and adjustment device 22 to the impregnation tank 21, thereby controlling whether the adhesive in the adhesive detection and adjustment device 22 is conveyed to the impregnation tank 21. Specifically, when the concentration detector 222 detects that the concentration of the adhesive is within the preset concentration range, the concentration adjustment component is not activated, and the on / off element 28 is opened, allowing the adhesive to be directly conveyed back into the impregnation tank 21. When the concentration detector 222 detects that the concentration of the adhesive is not within the preset concentration range, the on / off element 28 is closed until the concentration adjustment component adjusts the concentration of the adhesive to within the preset concentration range, at which point the on / off element 28 is opened again, allowing the adjusted adhesive to be conveyed back into the impregnation tank 21, thus completing the adjustment of the adhesive concentration.

[0147] Furthermore, in this embodiment, such as Figure 1 , Figure 3 and Figure 4As shown, the impregnation device 20 also includes a stirring element 29 disposed inside the adhesive detection and adjustment device 22. The stirring element 29 rotates to stir the adhesive in the adhesive detection and adjustment device 22, so that the material in the concentration adjustment component can be quickly dissolved into the adhesive and the uniformity of the adhesive can be ensured, thereby ensuring the accuracy of the concentration detection result. In the impregnation process, the stirring element 29 preferably rotates continuously to ensure the stirring effect.

[0148] In this embodiment, as Figure 1 and Figure 3 As shown, the impregnation device 20 also includes a conveying assembly 25 disposed in the impregnation tank 21. The conveying assembly 25 is used to drive the filament bundle 60 to move within the impregnation device 20 and to adhere the adhesive during the movement. Specifically, the conveying assembly 25 includes a plurality of conveying shafts spaced apart along the conveying path direction of the filament bundle 60. The filament bundle 60 conforms to the sidewall of a portion of each conveying shaft. The rotation of the conveying shaft can drive the filament bundle 60 to move along its conveying direction.

[0149] In a preferred embodiment, such as Figure 1 and Figure 3 As shown, at least a portion of the conveying shafts in the conveying assembly 25 are positioned below the surface of the adhesive liquid, allowing the filament bundle 60 to adhere to the adhesive liquid during conveying. At least two conveying shafts are positioned below the surface of the adhesive liquid, and the conveying shafts positioned below and above the surface of the adhesive liquid are alternately arranged, ensuring that the filament bundle 60 is immersed in the adhesive liquid at least twice during the conveying process, thereby ensuring sufficient impregnation and improving sample preparation. Furthermore, a conveying shaft located at the end of the conveying assembly 25 is positioned above the surface of the adhesive liquid, allowing the filament bundle 60 to leave the adhesive liquid and move to the extrusion component 26 described below.

[0150] In this embodiment, as Figure 1 and Figure 3 As shown, the impregnation apparatus 20 also includes an extrusion member 26 disposed downstream of the conveying assembly 25. The extrusion member 26 is disposed above the liquid surface of the adhesive and is used to remove excess adhesive from the filament bundle 60. The extrusion member 26 is formed with two extrusion sections respectively disposed at both ends in the thickness direction of the filament bundle 60. The extrusion sections are formed into a roller-shaped structure. The sidewalls of the two extrusion sections abut against the filament bundle 60 and apply pressure to the filament bundle 60. When the filament bundle 60 passes through the extrusion member 26, the two extrusion sections squeeze the two sides of the filament bundle 60 in the thickness direction to remove excess adhesive from the filament bundle 60. The adhesive removed by the extrusion sections flows back to the impregnation tank 21 to avoid waste of adhesive.

[0151] In a preferred embodiment, such as Figure 1 and Figure 3As shown, multiple extrusion parts 26 are provided along the conveying path of the filament bundle 60. The extrusion capacity of two extrusion parts 26 increases along the conveying path of the filament bundle 60. For example, if two extrusion parts 26 are provided, the pressure between the two extrusion sections of the upstream extrusion part 26 is 500-1000 N / m, and the pressure between the two extrusion sections of the downstream extrusion part 26 is 1500-2500 N / m. This allows the upstream extrusion part 26 to perform preliminary extrusion of the adhesive on the filament bundle 60, and the downstream extrusion part 26 to completely remove excess adhesive from the filament bundle 60.

[0152] Furthermore, in this embodiment, such as Figure 1 and Figure 3 As shown, the impregnation device 20 also includes a second tension adjusting member 200 disposed downstream of the extrusion member 26. The second tension adjusting member 200 can be disposed outside the impregnation tank 21, and is used to provide power for the filament bundle 60 to move along the conveying path and to control the tension of the filament bundle 60 in the impregnation process. The second tension adjusting member 200 can have the same structure as the first tension adjusting member 100.

[0153] In this embodiment, as Figure 1 and Figure 5 As shown, the curing device 30 is located downstream of the impregnation device 20 and is used to heat and shape the adhesive-adhesive-adhesive-coated filament bundle 60, making the soft filament bundle 60 hard. Specifically, the curing device 30 includes a heating element 31 and an air outlet 32 ​​corresponding to the heating element 31. The heating element 31 and the air outlet 32 ​​are located at both ends in the thickness direction of the filament bundle 60. The heating element 31 is used to dry the adhesive on the filament bundle 60 to accelerate the curing of the adhesive. The heating element 31 can be located below the filament bundle 60, and the rising airflow of hot air allows the heat generated by the heating element 31 to be quickly transferred to the filament bundle 60 to improve the curing efficiency. During the curing process, the adhesive will evaporate solvent. The air outlet 32 ​​is used to discharge the evaporated solvent from the curing device 30. The air outlet 32 ​​can be located above the filament bundle 60 to help accelerate the evaporation of solvent. The heating element 31 can be a thermal resistor or a heating rod, as long as it has the ability to dissipate heat. The air outlet 32 ​​can be a fan, as long as it can form an airflow within the curing device 30.

[0154] In a preferred embodiment, such as Figure 1 and Figure 5 As shown, multiple heating elements 31 and multiple air outlets 32 are provided. Multiple heating elements 31 and multiple air outlets are arranged at intervals along the conveying path of the filament bundle 60 to accelerate the curing speed of the adhesive. The heating elements 31 and their corresponding air outlets 32 in the thickness direction of the filament bundle 60 form a curing unit. The filament bundle 60 stays in each curing unit for a preset time to improve the curing effect. The preferred residence time of the filament bundle 60 in the entire curing device 30 is 10 to 30 minutes.

[0155] Furthermore, in this embodiment, such as Figure 1 and Figure 5 As shown, the curing device 30 also includes a temperature measuring element 33. Multiple temperature measuring elements 33 are provided, and each temperature measuring element 33 is located between two adjacent curing units. The temperature measuring element 33 is a temperature sensor used to measure the temperature of each part in the curing device 30.

[0156] In this embodiment, as Figure 1 and Figure 5 As shown, since the solvent evaporates more at the inlet of the curing device 30, the air volume of the air outlet 32 ​​decreases sequentially along the conveying direction of the filament bundle 60 to save energy and reduce costs. The air volume of the air outlet 32 ​​can be controlled by the power of the air outlet 32.

[0157] Furthermore, in this embodiment, such as Figure 1 and Figure 5 As shown, multiple heating elements 31 form a variable-temperature zone and a constant-temperature zone, thus improving the curing effect and avoiding the situation where the outside of the filament bundle 60 is completely cured while the inside has a poor curing effect. Specifically, along the conveying direction of the filament bundle 60, the heat generation of the heating elements 31 located in the variable-temperature zone increases sequentially, and the constant-temperature zone is located downstream of the variable-temperature zone. The variable-temperature zone can ensure uniform curing of the adhesive, and the constant-temperature zone can consolidate the curing effect. For example, four heating elements 31 are set. Along the conveying direction of the filament bundle 60, the first two heating elements 31 form a variable-temperature zone, and the last two heating elements 31 form a constant-temperature zone. The temperature range of the first heating element 31 is 60-90℃, the temperature range of the second heating element 31 is 90-120℃, and the temperature range of the third and fourth heating elements 31 is 100-150℃.

[0158] In this embodiment, as Figure 1 and Figure 5 As shown, the curing device 30 also includes an exhaust gas emission component, which is formed as a pipe structure. One end of the exhaust gas emission component is connected to the curing device 30 and the other end is connected to the outside or a heat exchange device. When the exhaust gas emission component is connected to the heat exchange device, the preheating generated in the curing process can be recovered and the preheated fresh air can be injected back into the curing device 30 to reduce the temperature difference and reduce energy consumption.

[0159] Furthermore, in this embodiment, such as Figure 1 and Figure 5 As shown, the curing device 30 also includes a third tension adjusting member 300 disposed at the end of the curing device 30, which is used to provide power for the filament bundle 60 to move along the conveying path and to control the tension of the filament bundle 60 in the curing process. The third tension adjusting member 300 may have the same structure as the first tension adjusting member 100 or the second tension adjusting member 200.

[0160] In this embodiment, as Figure 1 , Figure 6 and Figure 10 As shown, the filament cutting device 40 is located downstream of the curing device 30 to cut the cured filament bundle 60 to a predetermined length. The predetermined length is set according to the sample requirements. Specifically, the filament cutting device 40 includes a cutting platform 41, a cutter 42 and a filament bundle detection element 43 facing the cutting platform 41. The cutter 42 can be a circular or strip-shaped structure and can move towards or away from the cutting platform 41. The filament bundle detection element 43 can be a displacement sensor. The cutting platform 41 has a conveying groove 411 extending along the conveying direction of the filament bundle 60 to guide the conveying path of the filament bundle 60, so that the filament bundle 60 moves towards the patch device 50 within the conveying groove 411. Preferably, multiple conveying grooves 411 are provided and are arranged one-to-one with the above-mentioned wire feeding section, so that the multifilament sample specifications in each conveying groove 411 are different, avoiding confusion between multifilament samples of different specifications during cutting.

[0161] In this embodiment, as Figure 1 , Figure 6 and Figure 10 As shown, a cutter 42 is disposed at the inlet end of the conveying trough 411 along the conveying direction of the filament bundle 60, and a filament bundle detection element 43 is disposed at the outlet end of the conveying trough 411. The cutter 42 can move toward the cutting platform 41 (so that the entire filament bundle 60 is cut into two segments along the length direction, wherein the segment detached from the filament tube is the cut filament bundle 62, and the filament bundle 60 still connected to the filament tube is the uncut filament bundle 61), so as to cut the cured filament bundle 60 and form a cut 63 between the uncut and cut filament bundle 62. The uncut filament bundle 61 pushes the cut filament bundle 62 to continue moving in the conveying trough 411. When the filament bundle detection element 43 detects the cut 63, the filament bundle detection element 43 feeds back a signal to the cutter 42, so that the cutter 42 moves toward the cutting platform 41 to cut the filament bundle 60 and form a new cut 63.

[0162] It should be noted that the cutter 42 can completely cut the filament bundle 60 in each conveying groove 411 in one cutting action, thereby improving the efficiency of the filament cutting process.

[0163] In this embodiment, as Figure 1 , Figure 6 and Figure 10As shown, the slicing device 40 also includes a clamping member 44 disposed at the outlet end of the conveying trough 411 and a sample collecting member 45 disposed downstream of the cutting platform 41. The clamping member 44 is formed as an L-shaped strip structure extending along the arrangement direction of the plurality of conveying troughs 411, so that it can abut against the top and side wall of the cutting platform 41 to fix the position of the clamping member 44. The sample collecting member 45 can be formed as a strip structure, so that the filament bundles 60 inside the sample collecting member 45 are stacked in a horizontal state. The end of the sample collecting member 45 near the cutting platform 41 can be formed as a slope, which helps the filament bundles 60 on the cutting platform 41 to enter the interior of the sample collecting member 45. The inclination direction of the slope makes the top to bottom of the sample collecting member 45 form a constricted structure. In addition, multiple sample collecting members 45 are preferably provided, and each sample collecting member 45 is provided in a one-to-one correspondence with the conveying trough 411.

[0164] The filament cutting process is as follows: when the filament bundle detector 43 detects the cut 63, the clamping device 44 moves toward the cutting platform 41 before the cutter 42 moves, and presses the filament bundle 60 toward the conveying groove 411 to prevent the filament bundle 60 from continuing to move forward; when the cutter 42 cuts the stopped filament bundle 60, the clamping device 44 leaves the cutting platform 41, so that the cut filament bundle 62 enters the sample collection device 45 under the push of the uncut filament bundle 61.

[0165] In this embodiment, as Figure 1 , Figure 7 and Figure 8 As shown, the patching device 50 is located downstream of the shredding device 40 and is used to patch both ends of the shredded bundle 60 in the length direction. Specifically, the patching device 50 includes a conveyor 51 and a reinforcing sheet feeding assembly 52, a glue spraying assembly 54 and a shredded bundle feeding assembly 53 disposed above the conveyor 51. The conveyor 51 is a conveyor belt, and patching is completed during the conveying process.

[0166] It should be noted that, as Figure 11 and Figure 12 As shown, additional reinforcing plates 70 need to be attached to both ends of the filament bundle 60 along its length, and two reinforcing plates 70 are provided at each end. The two reinforcing plates 70 are attached to both ends of the filament bundle 60 along its thickness, and the filament bundle 60 needs to be attached to the exact center of the reinforcing plate 70.

[0167] In this embodiment, as Figure 1 , Figure 7 , Figure 8 and Figure 11As shown, the tow feeding component 53 includes a sample collecting component 45 and a laying component 531. The laying component 531 is located below the sample collecting component 45. One end of the sample collecting component 45 facing the laying component 531 is formed into a strip-shaped opening 451, and the size of the opening 451 is only large enough for one tow 60 to pass through. The laying component 531 is formed into a gear-shaped structure. The outer wall of the gear structure can abut against the opening 451 when the laying component 531 rotates. When the laying component 531 rotates to the point where the groove between two adjacent gear teeth faces the opening 451, the tow 60 falls from the opening 451 and enters the groove. When the groove rotates to leave the opening 451, the gear teeth on the side of the groove abut against the opening 451 to prevent the tow 60 in the sample collecting component from falling further, until the laying component 531 rotates so that the next groove corresponds to the opening 451. In this way, the tow 60 in the sample collecting component 45 can fall onto the conveying component 51 at intervals. It should be noted that the filament bundle 60 located in the groove rotates synchronously with the lofting component 531 until the groove faces the conveyor component 51, at which point the filament bundle 60 in the groove falls onto the conveyor belt. In this way, the falling time of the filament bundle 60 in the groove can be controlled by controlling the rotation speed of the lofting component 531, so that the filament bundle 60 can fall accurately onto the first reinforcing sheet with adhesive and be located in the exact center of the first reinforcing sheet.

[0168] In this embodiment, as Figure 1 , Figure 7 and Figure 8 As shown, the reinforcing sheet feeding assembly 52 includes a first reinforcing sheet feeding member 521 and a second reinforcing sheet feeding member 522, which are spaced apart along the conveying direction of the conveyor 51. The filament feeding member 53 is disposed between the first reinforcing sheet feeding member 521 and the second reinforcing sheet feeding member 522. Both the first reinforcing sheet feeding member 521 and the second reinforcing sheet feeding member 522 include two feeding portions corresponding to the two ends of the cut filament bundle 62 (formed in the filament cutting device 40) in the length direction. The feeding portion is formed into a vertically extending cylindrical structure. Multiple reinforcing sheets are stacked inside the cylindrical structure. Each feeding portion feeds only one reinforcing sheet onto the conveyor 51 at a time (the first reinforcing sheet feeding member feeds the first reinforcing sheet, and the second reinforcing sheet feeding member 522 feeds the second reinforcing sheet).

[0169] In this embodiment, as Figure 1 , Figure 7 and Figure 8As shown, the glue spraying component 54 is disposed between the first reinforcing sheet unloading component 521 and the filament bundle unloading component 53. The glue spraying component 54 is provided with two nozzles, which are disposed at both ends in the length direction of the filament bundle 60, to apply glue to the two first reinforcing sheets that fall from the first reinforcing sheet unloading component 521 onto the conveyor component 51. Preferably, the glue spraying component is connected to the glue dipping device 20, so that the glue sprayed by the glue spraying component comes from the glue dipping device 20. This eliminates the need for additional glue preparation, thereby saving costs and making the glue concentration controllable.

[0170] The process of attaching the filament bundle 60 is as follows: the first reinforcing sheet unloading component 521 places two first reinforcing sheets on the conveyor 51; when the first reinforcing sheet moves to the setting position of the adhesive spraying component 54 under the action of the conveyor 51, the adhesive spraying component 54 sprays adhesive liquid corresponding to the first reinforcing sheet; when the first reinforcing sheet is conveyed to the bottom of the filament bundle unloading component 53, the cut filament bundle 62 falls and adheres to the top of the adhesive-coated first reinforcing sheet and is located in the middle of the two first reinforcing sheets; when the filament bundle 60 adhered to the first reinforcing sheet is conveyed to the bottom of the second reinforcing sheet, the second reinforcing sheet falling from the second reinforcing sheet unloading component 522 covers the top of the first reinforcing sheet, so that both ends of the filament bundle 60 in the length direction are adhered between the first reinforcing sheet and the second reinforcing sheet.

[0171] In this embodiment, as Figure 1 , Figure 7 and Figure 8 As shown, the patch applicator 50 also includes a pre-drying component 55 disposed above the conveyor 51. The pre-drying component 55 can be an infrared heating lamp. The pre-drying component 55 is disposed downstream of the second reinforcing sheet feeder 522 and corresponds to the placement position of the reinforcing sheet. The heat released by the pre-drying component 55 can pre-cure the adhesive-coated reinforcing sheet. In a preferred embodiment, multiple pre-drying components 55 are provided, and the multiple components are arranged along the movement direction of the conveyor 51 with the drying component to improve the curing effect of the adhesive-coated reinforcing sheet.

[0172] In this embodiment, as Figure 1 , Figure 7 and Figure 8As shown, the patch assembly 50 also includes a curing component located downstream of the conveyor 51. The curing component includes a curing platform 561 and a heating plate 562 located above the curing platform 561. The conveyor 51 conveys the filament bundle 60 with the first and second reinforcing sheets attached to it to the top of the curing platform 561, allowing the adhesive between the first and second reinforcing sheets to dry and cure naturally at room temperature for 10–24 hours. Alternatively, when the filament bundle 60 is conveyed to the top of the curing platform 561, the heating plate 562 moves toward the curing platform 561, clamping the first and second reinforcing sheets between the curing platform 561 and the heating plate 562. The heating plate 562 releases heat to accelerate the curing of the adhesive. The heating temperature of the heating plate 562 is preferably 50–90°C to accelerate the curing of the adhesive while preventing the reinforcing sheets from being burned. The curing time is 30–90 minutes, which saves time and improves sample preparation efficiency compared to natural curing. In addition, the sample can be taken from the curing platform 561 during the test.

[0173] It should be noted that before the formal sample preparation begins, the beginning of the filament bundle 60 on the spool is passed sequentially through the filament feeding device 10, the resin impregnation device 20, the curing device 30, and the filament cutting device 40 to form a clear conveying path for the filament bundle 60. The filament bundle 60 is clamped and stretched under the action of the filament feeding device 11, the first tension adjusting device 100, the second tension adjusting device 200, and the third tension adjusting device 300 to prevent the filament bundle 60 from falling off the carbon fiber multifilament tensile performance test sample preparation device. When the formal sample preparation begins, the portion of the beginning of the filament bundle 60 that has not undergone the resin impregnation and curing processes is considered waste and is not counted as a test sample.

[0174] Furthermore, in this embodiment, such as Figure 13As shown, the carbon fiber multifilament tensile performance testing sample preparation device also includes an equipment control system, which includes an alarm device, a parameter control device, and an emergency stop device. The parameter control device processes the signals fed back by the liquid level detector 24, the fiber bundle detector 43, the temperature detector 221, and the concentration detector 222, and issues commands to drive the temperature adjustment component, the concentration adjustment component, the on / off component 28, the clamping component 44, the cutter 42, and other components to open, close, or move, so as to regulate the operating status of the whole machine in real time. For example, when the actual parameter in a certain device deviates from the set range, the alarm device issues an alarm signal. When the alarm signal is issued, the adjustment module in the device, such as the temperature adjustment component or the concentration adjustment component, will activate. The components can be automatically adjusted to bring the actual parameters to the set range to clear the alarm; or when the alarm signal is issued, manual intervention can be performed to bring the actual parameters to the set range to clear the alarm. In addition, the parameter control device can also control the start and stop of the conveying motion of the filament bundle 60. The emergency stop device can stop the conveying motion of the filament bundle 60. When the emergency stop device is activated, the clamping fastener 44 presses against the cutting platform 41 to prevent the filament bundle 60 from continuing to move. At the same time, the conveying system consisting of the filament feeding component 11, the first tension adjusting component 100, the second tension adjusting component 200, the third tension adjusting component 300 and the conveying component 51 stops moving to avoid injury to personnel caused by sudden events.

[0175] It should be noted that the equipment control system is equipped with a program lock to ensure the safe use of the whole machine, and the system used to control the cutter 42 is equipped with a physical lock to ensure the safe use of the cutter 42.

[0176] In addition, in this embodiment, the carbon fiber multifilament tensile performance test sample preparation device also includes a display device connected to the equipment control system. The display device can be a display screen, used to show parameters that affect the sample preparation effect, such as the concentration of the adhesive and the temperature inside the curing device 30, so that the operator can understand the operating status of the whole machine in real time.

[0177] The carbon fiber multifilament tensile property testing sample preparation device according to the present invention has the following beneficial effects:

[0178] First, the carbon fiber multifilament tensile performance test sample preparation device can control the tension of the fiber bundle while conveying it, so as to ensure the consistency and stability of the test results. The glue impregnation device can monitor the concentration of the glue solution in real time and adjust the unqualified glue solution so that the concentration of the glue solution meets the sample preparation standard, thereby improving the quality of the sample and improving the accuracy of the carbon fiber multifilament tensile performance test results.

[0179] Secondly, this device automates the sample preparation process for carbon fiber multifilament tensile performance testing. Operators only need to take the prepared sample from the curing platform and perform result testing, reducing the workload of operators.

[0180] Importantly, during the operation of the entire equipment, the operator only needs to monitor whether the equipment is operating normally. The sample preparation operation is carried out by the equipment according to the requirements of the test sample, which can greatly reduce the impact of human factors on the test results. While improving the sample preparation efficiency, the sample is not affected by the operator's work experience or work status. This ensures the quality of the sample and reduces the coefficient of variation of the test data, so as to ensure that the test results are more scientific, reasonable and convincing, and thus more realistically reflect the true performance of the product.

[0181] The continuous operation of each device ensures a seamless sample preparation process, reducing the time spent on process connections and significantly shortening the time required for sample preparation. This allows for more timely provision of test data, enabling prompt feedback to production and facilitating timely adjustment of carbon fiber product process control. It also further shortens the required man-hours for carbon fiber product production cycles, thereby improving production efficiency.

[0182] In addition, automated sample preparation can reduce the operator's contact with carbon fiber and chemical products such as adhesives. This can ensure the purity of the sample and protect the operator by blocking the operator's intake channels such as inhalation or skin contact, thereby reducing the risk of occupational diseases.

[0183] The second aspect of the present invention provides a method for using a carbon fiber multifilament tensile performance test sample preparation device, which is applied to the above-mentioned carbon fiber multifilament tensile performance test sample preparation device. The method of use in this embodiment includes the applications mentioned in the embodiments of the above-mentioned carbon fiber multifilament tensile performance test sample preparation device, and will not be repeated in this embodiment.

[0184] In this embodiment, before the carbon fiber multifilament tensile performance test sample preparation device is activated, the fiber bundle is sequentially passed through the fiber feeding device, the resin impregnation device, the curing device, and the fiber cutting device to form a defined conveying path. It should be noted that fiber bundles that do not sequentially pass through the fiber feeding device, the resin impregnation device, the curing device, the fiber cutting device, and the patching device are considered waste and cannot be used as samples.

[0185] In this embodiment, after the carbon fiber multifilament tensile performance test sample preparation device is activated, the components with conveying functions in the fiber feeding device, impregnation device, curing device, fiber cutting device and patching device move to drive the fiber bundle along its conveying path, so that the fiber bundle completes the sample preparation process sequentially in each device.

[0186] In this embodiment, at least some of the components with conveying functions in the filament feeding device, the resin impregnation device, and the curing device adjust the tension of the filament bundle during the conveying process.

[0187] In this embodiment, the impregnation device monitors and controls the parameters of the adhesive solution adhering to the filaments in real time, so that the adhesive solution adhering to the filaments meets the sample requirements.

[0188] In this embodiment, the curing device heats the filament bundle with adhesive to cure it; during the curing process, the curing effect of the sample is ensured by controlling parameters such as heating temperature and time.

[0189] In this embodiment, the slicing device cuts the solidified filament bundle into multiple segments, ensuring that the cut of each segment is flush.

[0190] In this embodiment, the patching device automatically applies reinforcing sheets to the segmented filament bundles and transports the filament bundles with reinforcing sheets to the test sampling location; the patching device can cure the adhesive on the reinforcing sheets during the transport process to shorten the sample preparation time.

[0191] The method of using the carbon fiber multifilament tensile performance test sample preparation device according to the present invention can realize the automated sample preparation process, making the sample preparation process continuous, reducing the time consumed by process connection, greatly reducing the time required for sample preparation, and the automated sample preparation process can also significantly reduce the influence of human factors on the test results. While improving the sample preparation efficiency, it makes the sample unaffected by the operator's work experience and working status, thus ensuring the quality of the sample, reducing the coefficient of variation of the test data, and ensuring that the test results are more scientific, reasonable and convincing, thereby more realistically reflecting the true performance of carbon fiber products.

[0192] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A sample preparation device for testing the tensile properties of carbon fiber multifilament, characterized in that, The sample preparation device for testing the tensile properties of carbon fiber multifilament includes: A yarn feeding device includes a yarn feeding component and a first tension adjusting component; a coiled yarn bundle is sleeved on the side wall of the yarn feeding component; the yarn feeding component rotates to unwind the coiled yarn bundle and convey it to the first tension adjusting component; the rotation speed of the first tension adjusting component and the rotation speed of the yarn feeding component form a speed difference to adjust the tension of the yarn bundle during the conveying process. An adhesive dipping device, located downstream of the feeding device, is used to adhere adhesive to the filament bundles conveyed by the feeding device. The adhesive dipping device includes an adhesive dipping tank and an adhesive detection and adjustment device connected to the adhesive dipping tank. The adhesive dipping tank contains the adhesive, and the filament bundles adhere to the adhesive during their conveying process in the adhesive dipping tank. A portion of the adhesive in the adhesive dipping tank can flow into the adhesive detection and adjustment device, enabling the adhesive detection and adjustment device to detect the concentration of the adhesive at a preset temperature and adjust the adhesive if the concentration is unqualified. A curing device, located downstream of the impregnation device, is used to heat and shape the filaments adhered to the adhesive, thereby hardening the soft filaments. A filament cutting device, located downstream of the curing device, is used to cut the cured filament bundle to a predetermined length; A patching device is located downstream of the slicing device and is used to patch both ends of the cut filament bundle along its length. The slicing device includes a cutting platform, a cutter, and a filament detection element disposed toward the cutting platform; The cutting platform has a conveying groove extending along the conveying direction of the filament bundle to guide the conveying path of the filament bundle, so that the filament bundle moves in the conveying groove toward the direction of the patching device; the cutter is disposed at the inlet end of the conveying groove along the conveying direction of the filament bundle, and the filament bundle detection element is disposed at the outlet end of the conveying groove. The cutter can move toward the cutting platform to cut the cured filament bundle and form a slit between the uncut and cut filament bundles. The uncut filament bundles push the cut filament bundles to continue moving in the conveying groove. When the filament bundle detection element detects the slit, the filament bundle detection element feeds a signal back to the cutter, causing the cutter to move toward the cutting platform to cut the filament bundles and form a new slit. The patch assembly includes a conveyor and a reinforcing sheet unloading assembly, an adhesive spraying assembly, and a filament unloading assembly disposed above the conveyor; The reinforcing sheet unloading assembly includes a first reinforcing sheet unloading component and a second reinforcing sheet unloading component spaced apart along the conveying direction of the conveying component. The filament unloading component is disposed between the first reinforcing sheet unloading component and the second reinforcing sheet unloading component. Both the first reinforcing sheet unloading component and the second reinforcing sheet unloading component include two unloading portions corresponding to the two ends of the cut filament in the length direction. The adhesive spraying component is disposed between the first reinforcing sheet unloading component and the filament unloading component to apply adhesive to the first reinforcing sheet falling from the first reinforcing sheet unloading component onto the conveying component; when the adhesive-coated first reinforcing sheet is conveyed to below the filament unloading component, the cut filament falls and adheres to the top of the adhesive-coated first reinforcing sheet; when the filament adhered to the first reinforcing sheet is conveyed to below the second reinforcing sheet, the second reinforcing sheet falling from the second reinforcing sheet unloading component covers the top of the first reinforcing sheet, so that both ends of the filament in the length direction are adhered between the first reinforcing sheet and the second reinforcing sheet; The filament feeding component includes a sample collector and a laying component. The laying component is located below the sample collector. One end of the sample collector facing the laying component has a strip-shaped opening, the size of which allows only one filament to pass through. The laying component has a gear-shaped structure, the outer wall of which abuts against the opening when the laying component rotates. When the laying component rotates until the groove between two adjacent teeth faces the opening, the filament falls from the opening and enters the groove between the two adjacent teeth. When the groove between the two adjacent teeth rotates away from the opening, the teeth on the side of the groove abut against the opening to prevent the filament in the sample collector from falling further, until the laying component rotates so that the groove between the next two adjacent teeth corresponds to the opening. In this way, the filament in the sample collector can fall onto the conveyor at intervals.

2. The carbon fiber multifilament tensile property test sample preparation device according to claim 1, characterized in that, The coiled filament bundle is formed into a filament spool with the filament bundle wound on it, and the filament feeding member is formed into a rotating shaft structure; The yarn feeding component includes a drive part capable of driving the yarn bobbin to rotate and an expansion part capable of being inflated. The drive part has a groove formed on its side wall in the length direction for the expansion part to be inserted into. By adjusting the air pressure injected into the expansion part, the expansion volume of the expansion part is changed, so that the expansion part abuts against the inner wall of the yarn bobbin, thereby driving the yarn bobbin and the drive part to rotate synchronously.

3. The carbon fiber multifilament tensile property test sample preparation device according to claim 1, characterized in that, The wire feeding device also includes a support member connected to the wire feeding component; The filament bundle includes multiple monofilaments, and multiple filament feeding members are provided. The support member is connected to multiple filament feeding members. At least some of the filament feeding members have different numbers of monofilaments in the filament bundle to prepare multifilament samples of different specifications. The first tension adjusting member is provided in a one-to-one correspondence with the filament feeding members. The tension of the filament bundle with different numbers of monofilaments is different. The more monofilaments there are, the greater the required tension.

4. The carbon fiber multifilament tensile property test sample preparation device according to claim 3, characterized in that, The filament feeding device further includes a filament separating member disposed between the filament feeding member and the first tension adjusting member. The filament separating member extends along the length direction of the filament feeding member and has multiple filament feeding sections spaced apart along the length direction of the filament separating member to form a conveying channel through which the filament bundles on different filament feeding members pass independently, so that filament bundles with different numbers of monofilaments are separated.

5. The carbon fiber multifilament tensile property test sample preparation device according to claim 4, characterized in that, The wire feeding device further includes a guide assembly disposed between the wire feeding member and the wire separating member; The guiding assembly includes a first guide member and a second guide member; Multiple wire feeding components are arranged alternately in multiple columns along the vertical direction, and the projections of the multiple wire feeding components in the horizontal direction do not overlap; multiple first guide components are provided and are arranged one-to-one with the wire feeding components. The first guide components are arranged on the side of the wire feeding components, so that the wire bundles unwound from the wire feeding components are conveyed in the horizontal direction, and the wire bundles on the multiple wire feeding components are arranged in multiple rows. The second guide is disposed between the first guide and the filament splitter. The second guide has a guide groove extending along the length direction of the filament splitter so that multiple filament bundles can pass through and extend to different filament feeding sections. Multiple filament bundles arranged in multiple rows by the first guide member merge into one row when passing through the second guide member. The multiple filament bundles that merge into one row are spaced apart in the guide groove, such that each filament bundle corresponds to a different wire feeding section.

6. The sample preparation device for testing the tensile properties of carbon fiber multifilaments according to claim 1, characterized in that, The adhesive detection and adjustment device includes a temperature detection element, a temperature adjustment component, a concentration detection element, and a concentration adjustment component; the temperature detection element extends into the adhesive to detect the temperature of the adhesive. The concentration of the adhesive solution has a preset concentration range at a standard temperature, and the temperature regulating component includes a heating element and a cooling element that can extend into the adhesive solution; When the temperature parameter detected by the temperature detection device is lower than the standard temperature, the heating device is activated to heat the adhesive until the temperature of the adhesive reaches the standard temperature. When the temperature parameter detected by the temperature detection device is higher than the standard temperature, the cooling device is activated to cool the adhesive until the temperature of the adhesive reaches the standard temperature. The concentration of the adhesive solution is directly proportional to its density, and the concentration detection device is used to detect the density of the adhesive solution. The concentration adjustment component includes a diluent additive and a thickener additive component. The thickener additive component includes a resin additive and a curing agent additive. The mass ratio of the materials added to the adhesive by the resin additive and the curing agent additive is 10:2~5.

7. The carbon fiber multifilament tensile property test sample preparation device according to claim 6, characterized in that, The impregnation device also includes a liquid level detection element disposed in the impregnation tank. The liquid level detection element can detect the liquid level height of the adhesive in the impregnation tank and feed the parameter back to the adhesive detection and adjustment device. The adhesive detection and adjustment device determines the volume of the adhesive in the impregnation tank based on the liquid level height and the size and shape of the impregnation tank. The adhesive solution continuously circulates in the dipping tank and the adhesive solution detection and adjustment device, so that the adhesive solution detection and adjustment device can detect and adjust the adhesive solution in the dipping tank in real time. When the concentration of the adhesive solution extracted by the adhesive solution detection and adjustment device is higher than the preset concentration range, the diluent additive adds material to the adhesive solution; The volume of material added to the adhesive by the diluent additive V The formula for 1 is: In the formula, ρ 胶 The density of the adhesive solution as detected by the concentration detection device; ρ 设1 It is the maximum or median value within the preset range; ρ1 is the density of the material in the diluent additive; V 0 represents the volume of the adhesive solution in the impregnation tank; When the concentration of the adhesive solution extracted by the adhesive solution detection and adjustment device is lower than the preset concentration range, the thickener addition component adds material to the adhesive solution; The thickener addition component adds material volume to the adhesive liquid. V The formula for 2 is: In the formula, ρ 设2 It is the minimum or intermediate value within the preset range; ρ2 is the concentration of the material in the resin additive and the material in the curing agent additive after mixing.

8. The carbon fiber multifilament tensile property test sample preparation device according to claim 7, characterized in that, The liquid level detection element generates a liquid level warning value. When the liquid level of the adhesive in the impregnation tank is lower than the liquid level warning value, the liquid level detection element feeds back to the adhesive detection and adjustment device, so that the diluent additive, the resin additive and the curing agent additive are added at a mass ratio of 10~15:10:2~5 and mixed to form a new adhesive, so as to replenish the adhesive in the impregnation tank.

9. The carbon fiber multifilament tensile property test sample preparation device according to claim 6, characterized in that, The output end of the adhesive detection and adjustment device is provided with a switch element, which is used to control whether the adhesive in the adhesive detection and adjustment device is delivered to the impregnation tank. When the concentration detection device detects that the concentration of the adhesive solution is within the preset concentration range, the concentration adjustment component is not activated, and the on / off component is opened, so that the adhesive solution is directly transported back into the impregnation tank. When the concentration detection device detects that the concentration of the adhesive solution is not within the preset concentration range, the switch is closed until the concentration adjustment component adjusts the concentration of the adhesive solution to within the preset concentration range. Then the switch is opened, allowing the adjusted adhesive solution to be transported back into the impregnation tank.

10. The carbon fiber multifilament tensile property test sample preparation device according to claim 1, characterized in that, The impregnation apparatus further includes a conveying assembly disposed in the impregnation tank and an extrusion component disposed downstream of the conveying assembly; The conveying assembly includes a plurality of conveying shafts spaced apart along the conveying path of the filament bundle. The filament bundle conforms to the sidewall of a portion of each conveying shaft. Rotation of the conveying shaft can drive the filament bundle to move along its conveying direction. In the conveying assembly, at least a portion of the conveying shaft is disposed below the liquid surface of the adhesive, so that the filaments can adhere to the adhesive during the conveying process. The conveying shaft disposed at the end of the conveying assembly is disposed above the liquid surface of the adhesive, so that the filaments leave the adhesive and move to the extruder. The extrusion member is disposed above the liquid surface of the adhesive. The extrusion member has two extrusion portions respectively disposed at both ends in the thickness direction of the filament bundle. The two extrusion portions abut against the filament bundle. When the filament bundle passes through the extrusion member, the two extrusion portions squeeze the two sides of the filament bundle in the thickness direction to remove excess adhesive from the filament bundle. The adhesive removed by the extrusion portions flows back to the impregnation tank.

11. The carbon fiber multifilament tensile property test sample preparation device according to claim 1, characterized in that, The curing device includes a heating element and an air outlet element corresponding to the heating element, wherein the heating element and the air outlet element are disposed at both ends in the thickness direction of the filament bundle; Multiple heating elements and multiple air outlets are provided, and the multiple heating elements and multiple air outlets are respectively arranged at intervals along the conveying path of the filament bundle; Along the conveying direction of the filament bundle, the air volume of the air outlet decreases sequentially; the plurality of heating elements form a variable temperature zone and a constant temperature zone, and along the conveying direction of the filament bundle, the heat generation of the heating element located in the variable temperature zone increases sequentially, and the constant temperature zone is located downstream of the variable temperature zone.

12. The carbon fiber multifilament tensile property test sample preparation device according to claim 1, characterized in that, The shredding device also includes a clamping device disposed at the outlet end of the conveying trough and a sample collection device disposed downstream of the cutting platform; When the filament detection element detects the cut, the clamping element moves toward the cutting platform before the cutter moves and presses the filament toward the feed groove to prevent the filament from moving. When the cutter cuts the stopped filament bundle, the clamping element leaves the cutting platform, causing the cut filament bundle to enter the sample collector under the push of the uncut filament bundle.

13. The carbon fiber multifilament tensile property test sample preparation device according to claim 1, characterized in that, The patching device also includes a pre-drying component disposed above the conveyor, which is located downstream of the second reinforcing sheet feeder. The heat released by the pre-drying component can cure the adhesive-coated reinforcing sheet.

14. The carbon fiber multifilament tensile property test sample preparation device according to claim 1, characterized in that, The patching device further includes a curing assembly disposed downstream of the conveyor, the curing assembly including a curing platform and a heating plate disposed above the curing platform; The conveyor transports the filament bundle with the first reinforcing sheet and the second reinforcing sheet attached to it to the top of the curing platform, so that the adhesive between the first reinforcing sheet and the second reinforcing sheet can be naturally dried and cured, or the heating plate moves toward the curing platform, so that the first reinforcing sheet and the second reinforcing sheet are clamped between the curing platform and the heating plate, and the heating plate can release heat to accelerate the curing of the adhesive.

15. A method for using a sample preparation device for tensile property testing of carbon fiber multifilament, characterized in that, Applied to the sample preparation device for testing the tensile properties of carbon fiber multifilaments as described in any one of claims 1 to 14; Before the carbon fiber multifilament tensile performance test sample preparation device is put into use, the fiber bundle is sequentially passed through the fiber feeding device, the resin impregnation device, the curing device and the fiber cutting device to form a defined conveying path; After the carbon fiber multifilament tensile performance test sample preparation device is activated, the conveying components in the fiber feeding device, the resin impregnation device, the curing device, the fiber cutting device, and the patching device move to drive the fiber bundle along its conveying path, so that the fiber bundle completes the sample preparation process sequentially in each device. At least some of the components with conveying functions in the filament feeding device, the resin impregnation device, and the curing device adjust the tension of the filament bundle during the conveying process; The impregnation device monitors and controls the parameters of the adhesive solution adhering to the filaments in real time, so that the adhesive solution adhering to the filaments meets the sample requirements. The curing device heats the filament bundles with the adhesive solution adhering to them, causing the filament bundles to cure; during the curing process, the curing effect of the sample is ensured by controlling parameters such as heating temperature and time. The slicing device cuts the solidified filament bundle into multiple segments, ensuring that the cut edges of each segment of the filament bundle are flush. The patching device automatically attaches reinforcing sheets to the segmented filament bundles and transports the reinforcing sheets-attached filament bundles to the test sampling location; during the transport process, the patching device can cure the adhesive on the reinforcing sheets to shorten the sample preparation time.

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