A glass fiber pre-dispersing device for the production of long glass fiber reinforced thermoplastics

Abstract

The invention relates to the field of glass fiber dispersion technology, and in particular to a glass fiber pre-dispersion device for producing long glass fiber reinforced thermoplastic plastics, comprising: an extrusion dispersion component, a stretching dispersion component, a shaping component, a dispersion detection module and a dispersion feedback module, wherein the extrusion dispersion component mixes and extrudes the long glass fiber with a molten plastic to form an initial dispersed molten plastic, the stretching dispersion component stretches the initial dispersed molten plastic to obtain a first dispersed molten plastic, the shaping component is used to flatten and shape the first dispersed molten plastic, the dispersion detection module detects glass fiber distribution and analyzes whether there is an abnormality in pre-dispersion, and the dispersion feedback module adjusts the pre-dispersion process according to the detection result; the invention accurately controls the dispersion state of the long glass fiber in the plastic to ensure uniform distribution, and simultaneously intelligently monitors quality and adjusts feedback to optimize the production process, thereby improving the mechanical properties and impact resistance of the composite material and reducing the risk of glass fiber breakage.

Description

Technical Field

[0001] The invention relates to the technical field of glass fiber dispersion, in particular to a glass fiber pre-dispersing device used for the production of long glass fiber reinforced thermoplastic plastics. Background Art

[0002] The existing technology of pre-dispersion of glass fiber mainly includes using a twin-screw extruder to mix resin, dispersant, stabilizer and other additives evenly, then heating and melting, then feeding the glass fiber filaments into the melted plastic, and using a shearing element to cut the glass fiber and disperse it in the plastic melt. In addition, it also includes using a glass fiber pre-dispersion tension frame to optimize the dispersion of glass fibers by adjusting the tension direction. However, these technologies have some problems, such as high manufacturing cost, uneven dispersion of glass fibers, and fiber aggregation caused by electrostatic effects.

[0003] Chinese patent application publication number: CN113332902A, discloses a glass fiber rapid dispersion device for filter material production, including a melting reactor and a workbench, the melting reactor is fixedly arranged at the upper end of the workbench, and support legs are fixed around the bottom of the workbench, and a bracket is horizontally connected between the two support legs. A jacket is provided on the outside of the melting reactor, and a plurality of groups of guide plates are evenly distributed on the inner wall of the melting reactor, and the guide plates are inclined downward and distributed in a ring shape; a shell is provided at the bottom of the workbench, and extrusion components are symmetrically provided on both sides of the inner wall of the shell; the bottom of the shell is connected to a discharge port; it can be seen that the glass fiber rapid dispersion device for filter material production has the following problems: it is impossible to adjust the shape of the long glass fiber during the dispersion process, resulting in the inability to form long glass fiber plastics with regular glass fiber distribution. Summary of the invention

[0004] To this end, the present invention provides a glass fiber pre-dispersing device for the production of long glass fiber reinforced thermoplastic plastics, which is used to overcome the problem in the prior art that the morphology of the long glass fibers cannot be adjusted during the dispersion process, resulting in the inability to form long glass fiber plastics with regular glass fiber distribution.

[0005] To achieve the above object, the present invention provides a glass fiber pre-dispersing device for the production of long glass fiber reinforced thermoplastics, comprising:

[0006] An extrusion dispersion component, comprising a plurality of screw extrusion mechanisms, for adding long glass fibers into a molten plastic, and extruding the molten plastic at a preset pulling speed to obtain a plurality of initial dispersed molten plastics;

[0007] A stretching and dispersing component connected to the extrusion and dispersing component, used for stretching and extending each of the initial dispersed molten plastics at a preset extension speed to obtain a plurality of first dispersed molten plastics;

[0008] A shaping component, connected to the stretching and dispersing component, for spreading and shaping the first dispersed molten plastic;

[0009] a dispersion detection module, which is connected to the stretching dispersion component and the shaping component respectively, and is used to obtain a glass fiber distribution image of the first dispersed molten plastic on the shaping component, and to process and analyze the glass fiber distribution image to determine whether there is an abnormality in the pre-dispersion of the long glass fiber;

[0010] A dispersion feedback module is respectively connected to the extrusion dispersion component, the stretching dispersion component and the dispersion detection module, and is used to determine an adjustment method for pre-dispersion of the long glass fiber according to a judgment result of the dispersion detection module.

[0011] Furthermore, the stretching dispersion component includes:

[0012] A first stretching unit connected to each of the screw extrusion mechanisms, for separating each of the initial dispersed molten plastics using an initial rolling speed;

[0013] A second stretching unit, connected to the first stretching unit, for stretching each of the initial dispersed molten plastics at a preset stretching speed to obtain the first dispersed molten plastic;

[0014] A convergence unit is connected to the second stretching unit and is used for collecting the dispersed first dispersed molten plastic.

[0015] Wherein, the initial rolling speed is the same as the preset traction speed.

[0016] Furthermore, the shaping component comprises:

[0017] A shaping platform, used to provide a laying plane for the first dispersed molten plastic, wherein the laying plane is parallel to a horizontal plane;

[0018] A cutting unit connected to the shaping platform and used for cutting the first dispersed molten plastic located at two ends of the laying plane;

[0019] The recycling unit is connected to the cutting unit and is used for recycling the cut first dispersed melt plastic.

[0020] Furthermore, the shaping platform is located behind the convergence unit along the moving direction of the first dispersed molten plastic.

[0021] Furthermore, the dispersion detection module performs grayscale processing on the glass fiber distribution image and obtains an average grayscale of the glass fiber distribution image;

[0022] The dispersion detection module identifies points with grayscale greater than the average as abnormal points, and records the abnormal points as analysis results.

[0023] Furthermore, the dispersion detection module selects glass fiber position analysis points in each of the first dispersed melt plastics in the grayscale image of the glass fiber distribution image, and performs a magnification process to obtain a glass fiber position analysis image;

[0024] The dispersion detection module obtains the angles between the glass fiber positions and the central axis of each long glass fiber in the image and the first dispersed molten plastic, and records them as analysis results;

[0025] Wherein, the glass fiber position analysis point is a non-abnormal point.

[0026] Furthermore, the dispersion detection module determines the glass fiber distribution discrete parameter and the glass fiber position consistency characterization parameter according to each of the analysis results to determine whether there is an abnormality in the pre-dispersion of the long glass fiber;

[0027] If the analysis result meets the long glass fiber pre-dispersion condition, it is determined that there is no abnormality in the pre-dispersion of the long glass fibers of the molten plastic;

[0028] Among them, the long glass fiber pre-dispersion condition is that the glass fiber distribution discrete parameter is greater than the standard dispersion parameter, and the glass fiber position consistency characterization parameter is less than the standard consistency characterization parameter.

[0029] Furthermore, the dispersion feedback module determines an adjustment method for pre-dispersion of the long glass fiber according to a judgment result of the dispersion detection module;

[0030] If the glass fiber distribution discrete parameters do not meet the long glass fiber pre-dispersion conditions, the pre-dispersion adjustment method of the long glass fiber is to reduce the addition rate of the long glass fiber into the molten plastic in the extrusion dispersion component, and collect all the first dispersed molten plastics for secondary extrusion and stretching to obtain a second dispersed molten plastic.

[0031] Furthermore, the dispersion feedback module determines, based on the judgment result of the dispersion detection module, that the adjustment method of the pre-dispersion of the long glass fiber also includes:

[0032] If the glass fiber position consistency characterization parameter does not meet the long glass fiber pre-dispersion condition, the pre-dispersion adjustment method of the long glass fiber is to collect all the first dispersed molten plastics and then perform secondary extrusion and stretching to obtain a second dispersed molten plastic.

[0033] Furthermore, when the stretching dispersion component is not stretched for the first time, the stretching speed is less than the preset stretching speed;

[0034] Among them, the extension speed of non-first stretching is negatively correlated with the number of stretching times.

[0035] Compared with the prior art, the beneficial effect of the present invention is that the device adds long glass fibers to the molten plastic and extrude them through a screw extrusion mechanism, then stretches and extends them through a stretching dispersion component, and the shaping component is responsible for flattening and shaping. The dispersion detection module uses grayscale processing and image analysis to determine whether there is an abnormality in the pre-dispersion of the long glass fibers, and the dispersion feedback module automatically adjusts the pre-dispersion process according to the detection results, reduces the addition speed or performs secondary extrusion and stretching. The present invention can accurately control the dispersion state of long glass fibers in plastics and ensure uniform distribution, thereby improving the mechanical properties and impact resistance of composite materials, reducing the risk of glass fiber breakage, and improving product quality and performance. At the same time, it realizes intelligent quality monitoring and feedback adjustment, optimizes the production process, and ensures that the manufacturing process of long glass fiber reinforced thermoplastics is more efficient and reliable.

[0036] Furthermore, in the present invention, the dispersion of long glass fibers in plastics is detected by machine vision technology, and the abnormal points of fiber aggregation are accurately identified by grayscale analysis. Considering that the optical properties of the fiber aggregation area are different from those of the surrounding environment, the reflected or transmitted light in the grayscale image changes, which in turn affects the grayscale value. By comparing these grayscale values ​​with the average grayscale, the fiber aggregation phenomenon can be quickly located and analyzed, ensuring the quality of long glass fiber pre-dispersion, and providing a better foundation for the manufacturing process of long glass fiber reinforced plastics.

[0037] Furthermore, in the present invention, through grayscale analysis and abnormal point identification, the fiber aggregation phenomenon can be accurately located, thereby ensuring the pre-dispersion quality of long glass fibers and improving the mechanical properties of composite materials. Grayscale processing is used to obtain the average grayscale of the glass fiber distribution image, and abnormal points with grayscale values ​​greater than the average are identified to ensure the accuracy of identification. In addition, the use of the nearest neighbor distance method to calculate the discrete parameters of the glass fiber distribution can effectively judge the uniformity of the glass fiber and ensure that the material's bearing capacity and impact resistance are significantly improved. The setting of standard dispersion parameters and consistent characterization parameters provides a clear quantitative standard for quality control, further enhancing the reliability and accuracy of detection.

[0038] Furthermore, by determining the discrete parameters and position consistency characterization parameters of the glass fiber distribution and comparing them with the preset dispersion conditions, it is determined whether the pre-dispersion of the long glass fiber meets the requirements. If not, the system will automatically adjust the operating parameters of the extrusion dispersion components, such as reducing the glass fiber addition speed, or performing secondary extrusion and stretching of the molten plastic to improve the dispersion state of the glass fiber. This adjustment strategy based on historical data and real-time feedback can ensure the rationality of the addition speed and flexibly adjust it according to actual conditions to meet the needs of quality control. In addition, the system reduces the risk of glass fiber breakage by reducing the extension speed to maintain the good condition of the glass fiber, which is conducive to improving the product quality and performance of long glass fiber reinforced thermoplastics and ensuring the consistency of its mechanical properties and appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the connection of a glass fiber pre-dispersion device for producing long glass fiber reinforced thermoplastics according to an embodiment of the present invention;

[0040] Figure 2 This is a schematic structural diagram of a glass fiber pre-dispersion device for producing long glass fiber reinforced thermoplastics according to an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the structure of a stretching and dispersing component according to an embodiment of the present invention;

[0042] Figure 4 It is a structural schematic diagram of a shaping component according to an embodiment of the present invention;

[0043] Figure 5 A logic diagram for determining whether there is an abnormality in the pre-dispersion of long glass fibers according to an embodiment of the present invention;

[0044] In the figure: 1, feeding port; 2, screw extrusion mechanism; 3, first stretching unit; 4, track; 5, second stretching unit; 6, initial dispersed molten plastic; 7, convergence unit; 8, first dispersed molten plastic; 9, shaping platform. DETAILED DESCRIPTION

[0045] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0046] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0047] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0048] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] See also Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the connection of a glass fiber pre-dispersion device for producing long glass fiber reinforced thermoplastics according to an embodiment of the present invention; Figure 2 The present invention is a schematic structural diagram of a glass fiber pre-dispersing device for producing long glass fiber reinforced thermoplastic plastics according to an embodiment of the present invention; the present invention provides a glass fiber pre-dispersing device for producing long glass fiber reinforced thermoplastic plastics, comprising:

[0050] An extrusion dispersion component, comprising a plurality of screw extrusion mechanisms 2, for adding long glass fibers into a molten plastic, and extruding the molten plastic at a preset pulling speed to obtain a plurality of initial dispersed molten plastics;

[0051] A stretching and dispersing component connected to the extrusion and dispersing component, used for stretching and extending each of the initial dispersed molten plastics at a preset extension speed to obtain a plurality of first dispersed molten plastics;

[0052] A shaping component, connected to the stretching and dispersing component, for spreading and shaping the first dispersed molten plastic;

[0053] a dispersion detection module, which is connected to the stretching dispersion component and the shaping component respectively, and is used to obtain a glass fiber distribution image of the first dispersed molten plastic on the shaping component, and to process and analyze the glass fiber distribution image to determine whether there is an abnormality in the pre-dispersion of the long glass fiber;

[0054] A dispersion feedback module is respectively connected to the extrusion dispersion component, the stretching dispersion component and the dispersion detection module, and is used to determine an adjustment method for pre-dispersion of the long glass fiber according to a judgment result of the dispersion detection module.

[0055] In implementation, the screw extrusion mechanism is preferably a twin-screw extruder, and its preset traction speed is 0.5-2.5 m / min. If the long glass fiber content is high (reaching 40% by mass), its preset traction speed is 0.5-1.5 m / min.

[0056] The long glass fibers are added through the feed port 1 of the screw extruder mechanism and mixed into the molten plastic.

[0057] The device adds long glass fibers to the molten plastic through a screw extrusion mechanism and extrude it, then stretches and extends it through a stretching dispersion component, and the shaping component is responsible for flattening and shaping. The dispersion detection module uses grayscale processing and image analysis to determine whether there is an abnormality in the pre-dispersion of the long glass fibers, and the dispersion feedback module automatically adjusts the pre-dispersion process according to the detection results, reduces the addition speed or performs secondary extrusion and stretching. The present invention can accurately control the dispersion state of long glass fibers in plastics, ensure uniform distribution, thereby improving the mechanical properties and impact resistance of composite materials, reducing the risk of glass fiber breakage, and improving product quality and performance. At the same time, it realizes intelligent quality monitoring and feedback adjustment, optimizes the production process, and ensures that the manufacturing process of long glass fiber reinforced thermoplastics is more efficient and reliable.

[0058] See also Figure 3 As shown, it is a schematic diagram of the structure of the stretching dispersion component of an embodiment of the present invention, and the stretching dispersion component includes:

[0059] A first stretching unit 3, connected to each of the screw extrusion mechanisms, for separating each of the initial dispersed molten plastics 6 using an initial rolling speed;

[0060] A second stretching unit 5, connected to the first stretching unit, for stretching each of the initial dispersed molten plastics at a preset stretching speed to obtain the first dispersed molten plastics 8;

[0061] The convergence unit 7 is connected to the second stretching unit and is used for collecting the dispersed first dispersed molten plastic.

[0062] Wherein, the initial rolling speed is the same as the preset traction speed.

[0063] In implementation, the first stretching unit is a parallel rod parallel to each screw extrusion mechanism, and a traction roller corresponding to each screw extrusion mechanism is arranged on the parallel rod, and the traction roller only pulls each initial dispersed molten plastic from the outlet of the screw extrusion mechanism to avoid the initial dispersed molten plastic from crossing;

[0064] The second stretching unit includes a plurality of stretching rollers, the number of which is the same as the number of outlets of the screw extruder mechanism. The preset extension speed of the second stretching unit is greater than the preset traction speed, and the preset extension speed is 1 to 5 m / min. If the long glass fiber content is high (reaching 40% by mass), the preset traction speed is 1 to 3 m / min. The second stretching unit moves on a track 4 with a length of 125 cm to stretch the initial dispersed molten plastic.

[0065] The stretching speed is closely related to the melt viscosity of the material. For long glass fiber reinforced thermoplastics, in its molten state, the melt viscosity determines the fluidity and deformation resistance of the material during the stretching process. Longer glass fibers are susceptible to excessive axial tension at higher stretching speeds, while in the lower stretching speed range, the glass fibers can gradually tend to be parallel as the melt stretches, reducing the risk of breakage.

[0066] See also Figure 4 As shown, it is a schematic diagram of the structure of the shaping component of an embodiment of the present invention, and the shaping component includes:

[0067] A shaping platform 9, used to provide a laying plane for the first dispersed molten plastic, wherein the laying plane is parallel to a horizontal plane;

[0068] A cutting unit connected to the shaping platform and used for cutting the first dispersed molten plastic located at two ends of the laying plane;

[0069] The recycling unit is connected to the cutting unit and is used for recycling the cut first dispersed melt plastic.

[0070] In practice, the surface of the shaping platform is smooth and has no protrusions. The shaping platform is a regular square with a length of not less than 50 cm and a width that allows each first dispersed molten plastic to be tightly laid on the shaping platform without overlapping. The structures of the cutting unit and the recycling unit are not specifically limited, and can complete the cutting and recycling of the molten plastic.

[0071] Specifically, the shaping platform is located behind the convergence unit along the moving direction of the first dispersed molten plastic.

[0072] In this embodiment, long glass fibers are added to the molten plastic through the feed port 1 on the screw extrusion mechanism 2 in the extrusion dispersion component, and the initial dispersed molten plastic 6 is formed by extrusion through the first stretching unit 3 at a preset traction speed. The second stretching unit 5 stretches and extends the initial dispersed molten plastic to obtain the first dispersed molten plastic 8, and the shaping component flattens and shapes the first dispersed molten plastic. In this process, the dispersion detection module obtains and processes the glass fiber distribution image of the first dispersed molten plastic, and analyzes whether there is any abnormality in the pre-dispersion. Finally, the dispersion feedback module automatically adjusts the pre-dispersion process according to the analysis results of the dispersion detection module. If necessary, the extrusion speed will be reduced or secondary extrusion and stretching will be performed to optimize the dispersion state of the glass fibers, ensure the uniform distribution of the long glass fibers in the plastic, improve the mechanical properties and impact resistance of the composite material, and reduce the risk of glass fiber breakage, thereby realizing intelligent quality monitoring and production process optimization.

[0073] See also Figure 5As shown, it is a logic diagram for determining whether there is an abnormality in the pre-dispersion of long glass fibers according to an embodiment of the present invention, wherein the dispersion detection module performs grayscale processing on the glass fiber distribution image and obtains the average grayscale of the glass fiber distribution image;

[0074] The dispersion detection module identifies points with grayscale greater than the average as abnormal points, and records the abnormal points as analysis results.

[0075] In implementation, the function of obtaining the glass fiber distribution image of the dispersion detection module can be realized through machine vision detection equipment. Usually, industrial cameras, lenses, light sources and image processing software are used. The image of the object is collected by the camera, and then the image is analyzed and processed using the image processing algorithm. This is a prior art and there is no specific limitation on the selection of equipment. The process of obtaining the glass fiber distribution image will not be repeated.

[0076] It can be understood that when fibers are aggregated, from the perspective of optical imaging, if the reflection or absorption characteristics of the fibers to light are different from those of the surrounding environment, and the imaging method is based on the reflection or transmission of light to form a grayscale image, then the light reflection or transmission of the fiber aggregation area will change. Usually, fiber aggregation will cause more light to be reflected or scattered back to the detector (in reflection imaging), or block more light from passing through (in transmission imaging), thereby increasing the grayscale value of the area in the image.

[0077] Therefore, the points with large gray values ​​can be judged as the existence of glass fiber aggregation, that is, the long glass fiber pre-dispersion of the molten plastic does not meet the requirements.

[0078] In the present invention, the dispersion of long glass fibers in plastics is detected by machine vision technology, and grayscale analysis is used to accurately identify abnormal points of fiber aggregation. Considering that the optical properties of the fiber aggregation area are different from the surrounding environment, the reflected or transmitted light in the grayscale image changes, which in turn affects the grayscale value. By comparing these grayscale values ​​with the average grayscale, the fiber aggregation phenomenon can be quickly located and analyzed, ensuring the quality of long glass fiber pre-dispersion, and providing a better foundation for the manufacturing process of long glass fiber reinforced plastics.

[0079] Specifically, the dispersion detection module selects glass fiber position analysis points in each of the first dispersed melt plastics in the grayscale image of the glass fiber distribution image, and performs a magnification process to obtain a glass fiber position analysis image;

[0080] The dispersion detection module obtains the angles between the glass fiber positions and the central axis of each long glass fiber in the image and the first dispersed molten plastic, and records them as analysis results;

[0081] Wherein, the glass fiber position analysis point is a non-abnormal point.

[0082] Specifically, the dispersion detection module determines the glass fiber distribution discrete parameters and the glass fiber position consistency characterization parameters according to each of the analysis results to determine whether there is an abnormality in the pre-dispersion of the long glass fiber;

[0083] If the analysis result meets the long glass fiber pre-dispersion condition, it is determined that there is no abnormality in the pre-dispersion of the long glass fibers of the molten plastic;

[0084] Among them, the long glass fiber pre-dispersion condition is that the glass fiber distribution discrete parameter is greater than the standard dispersion parameter, and the glass fiber position consistency characterization parameter is less than the standard consistency characterization parameter.

[0085] In the implementation, the nearest neighbor distance method is used to determine the discrete parameters of glass fiber distribution. For all abnormal points on the plane, the distance from it to its nearest neighbor point is calculated. If the variation range of these distances is small, it means that the distribution of the points is relatively uniform. The uniformity is judged by comparing the maximum value dmax and the minimum value dmin of these distances. The discrete parameter of glass fiber distribution is the average value of dmax / dmin of all abnormal points. The standard dispersion parameter is selected in the interval [1.05,1.1].

[0086] It is understandable that evenly distributed long glass fibers help to improve the comprehensive mechanical properties of composite materials, including bending and tensile strength. Evenly dispersed long glass fibers can transfer stress more effectively, increase the material's bearing capacity, and significantly improve the material's impact resistance, which is manifested in a 2 to 3 times increase in impact strength.

[0087] Therefore, smaller standard dispersion parameters can ensure the dispersion effect of glass fiber pre-dispersion, thereby improving the material properties of long glass fiber reinforced thermoplastics.

[0088] In the above embodiment, the glass fiber position consistency characterization parameter is determined by comparing the average deviation of the angle between each long glass fiber and the central axis of the first dispersed molten plastic with the corresponding average value, and the standard consistency characterization parameter is selected within the interval [0.15, 0.25]. If the long glass fiber reinforced thermoplastic plastic has no requirements on the parallelism of the glass fibers therein, the glass fiber position consistency characterization parameter may not be used for determination.

[0089] It is understandable that the uniform and parallel distribution of long glass fibers in plastics can significantly improve the mechanical properties of composite materials, such as tensile strength, impact strength and hardness, because the orderly arranged glass fibers can effectively transmit their high strength and high stiffness characteristics.

[0090] In the present invention, through grayscale analysis and abnormal point identification, the fiber aggregation phenomenon can be accurately located, thereby ensuring the pre-dispersion quality of long glass fibers and improving the mechanical properties of composite materials. Grayscale processing is used to obtain the average grayscale of the glass fiber distribution image, and abnormal points with grayscale values ​​greater than the average are identified to ensure the accuracy of identification. In addition, the use of the nearest neighbor distance method to calculate the discrete parameters of the glass fiber distribution can effectively judge the uniformity of the glass fiber and ensure that the material's bearing capacity and impact resistance are significantly improved. The setting of standard dispersion parameters and consistent characterization parameters provides a clear quantitative standard for quality control, further enhancing the reliability and accuracy of detection.

[0091] Specifically, the dispersion feedback module determines the adjustment method of the pre-dispersion of the long glass fiber according to the judgment result of the dispersion detection module;

[0092] If the glass fiber distribution discrete parameters do not meet the long glass fiber pre-dispersion conditions, the pre-dispersion adjustment method of the long glass fiber is to reduce the addition rate of the long glass fiber into the molten plastic in the extrusion dispersion component, and collect all the first dispersed molten plastics for secondary extrusion and stretching to obtain a second dispersed molten plastic.

[0093] In implementation, the initial addition rate of the long glass fiber to the molten plastic is determined according to the addition rate that meets the pre-dispersion requirements during the production process of the long glass fiber reinforced thermoplastic plastic with the same parameters in historical data.

[0094] Specifically, the dispersion feedback module determines, based on the judgment result of the dispersion detection module, that the adjustment method of the pre-dispersion of the long glass fiber also includes:

[0095] If the parameter characterizing the consistent position of the glass fibers does not meet the pre-dispersion condition of the long glass fibers, the pre-dispersion adjustment method of the long glass fibers is to collect all the first dispersed molten plastics and then perform secondary extrusion and stretching to obtain a second dispersed molten plastic.

[0096] In practice, the process of collecting the first dispersed molten plastic is not specifically limited. All the first dispersed molten plastic can be collected here and put into the extrusion dispersion component, which will not be described in detail.

[0097] Specifically, when the stretching dispersion component is not stretched for the first time, the stretching speed is less than the preset stretching speed;

[0098] Among them, the extension speed of non-first stretching is negatively correlated with the number of stretching times.

[0099] In implementation, the adjusted extension speed is 0.9 times the original extension speed. During the stretching process of long glass fiber reinforced thermoplastics, when the number of extensions increases, the slow extension speed can ensure that the glass fiber remains in a good state in the plastic matrix, avoid glass fiber breakage, and improve product quality and performance.

[0100] In the present invention, by determining the discrete parameters and position consistency characterization parameters of the glass fiber distribution and comparing them with the preset dispersion conditions, it is determined whether the pre-dispersion of the long glass fiber meets the requirements. If not, the system will automatically adjust the operating parameters of the extrusion dispersion component, such as reducing the glass fiber addition speed, or performing secondary extrusion and stretching on the molten plastic to improve the dispersion state of the glass fiber. This adjustment strategy based on historical data and real-time feedback can ensure the rationality of the addition speed and flexibly adjust it according to actual conditions to meet the needs of quality control. In addition, the system reduces the risk of glass fiber breakage by reducing the extension speed to maintain the good state of the glass fiber, which is conducive to improving the product quality and performance of long glass fiber reinforced thermoplastics and ensuring the consistency of its mechanical properties and appearance.

[0101] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0102] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A glass fiber pre-dispersion device for the production of long glass fiber reinforced thermoplastics, characterized in that: include: An extrusion dispersion component, comprising a plurality of screw extrusion mechanisms, for adding long glass fibers into a molten plastic, and extruding the molten plastic at a preset pulling speed to obtain a plurality of initial dispersed molten plastics; A stretching and dispersing component connected to the extrusion and dispersing component, used for stretching and extending each of the initial dispersed molten plastics at a preset extension speed to obtain a plurality of first dispersed molten plastics; A shaping component, connected to the stretching and dispersing component, for spreading and shaping the first dispersed molten plastic; a dispersion detection module, which is connected to the stretching dispersion component and the shaping component respectively, and is used to obtain a glass fiber distribution image of the first dispersed molten plastic on the shaping component, and to process and analyze the glass fiber distribution image to determine whether there is an abnormality in the pre-dispersion of the long glass fiber; A dispersion feedback module, which is respectively connected to the extrusion dispersion component, the stretching dispersion component and the dispersion detection module, and is used to determine an adjustment method for pre-dispersion of the long glass fiber according to a judgment result of the dispersion detection module; Wherein, the dispersion detection module performs grayscale processing on the glass fiber distribution image and obtains the average grayscale of the glass fiber distribution image; The dispersion detection module identifies points with grayscale values ​​greater than the average grayscale as abnormal points, and records the abnormal points as analysis results; The dispersion detection module selects glass fiber position analysis points in each of the first dispersed melt plastics in the grayscale image of the glass fiber distribution image, and performs a magnification process to obtain a glass fiber position analysis image; The dispersion detection module obtains the angles between the glass fiber positions and the central axis of each long glass fiber in the image and the first dispersed molten plastic, and records them as analysis results; Wherein, the glass fiber position analysis point is a non-abnormal point; The dispersion detection module determines the glass fiber distribution discrete parameters and the glass fiber position consistency characterization parameters according to each of the analysis results to determine whether there is an abnormality in the pre-dispersion of the long glass fiber; If the analysis result meets the long glass fiber pre-dispersion condition, it is determined that there is no abnormality in the pre-dispersion of the long glass fibers of the molten plastic; Wherein, the long glass fiber pre-dispersion condition is that the glass fiber distribution discrete parameter is greater than the standard dispersion parameter, and the glass fiber position consistency characterization parameter is less than the standard consistency characterization parameter; The dispersion feedback module determines the adjustment method of the pre-dispersion of the long glass fiber according to the judgment result of the dispersion detection module, including: If the glass fiber distribution discrete parameters do not meet the long glass fiber pre-dispersion conditions, the pre-dispersion adjustment method of the long glass fiber is to reduce the addition rate of the long glass fiber into the molten plastic in the extrusion dispersion component, and collect all the first dispersed molten plastics for secondary extrusion and stretching to obtain a second dispersed molten plastic.

2. The glass fiber pre-dispersion device for the production of long glass fiber reinforced thermoplastics according to claim 1, characterized in that: The stretch dispersion component comprises: A first stretching unit connected to each of the screw extrusion mechanisms, for separating each of the initial dispersed molten plastics using an initial rolling speed; A second stretching unit, connected to the first stretching unit, for stretching each of the initial dispersed molten plastics at a preset stretching speed to obtain the first dispersed molten plastic; A collecting unit connected to the second stretching unit, for collecting the dispersed first dispersed molten plastic; Wherein, the initial rolling speed is the same as the preset traction speed.

3. The glass fiber pre-dispersion device for the production of long glass fiber reinforced thermoplastics according to claim 2, characterized in that: The shaping component comprises: A shaping platform, used to provide a laying plane for the first dispersed molten plastic, wherein the laying plane is parallel to a horizontal plane; A cutting unit connected to the shaping platform and used for cutting the first dispersed molten plastic located at two ends of the laying plane; The recovery unit is connected to the cutting unit and is used for recovering the cut first dispersed melt plastic.

4. The glass fiber pre-dispersion device for the production of long glass fiber reinforced thermoplastics according to claim 3, characterized in that: The shaping platform is located behind the convergence unit along the moving direction of the first dispersed molten plastic.

5. The glass fiber pre-dispersing device for the production of long glass fiber reinforced thermoplastics according to claim 4, characterized in that: The dispersion feedback module determines, based on the judgment result of the dispersion detection module, that the adjustment method of the pre-dispersion of the long glass fiber also includes: If the parameter characterizing the consistent position of the glass fibers does not meet the pre-dispersion condition of the long glass fibers, the pre-dispersion adjustment method of the long glass fibers is to collect all the first dispersed molten plastics and then perform secondary extrusion and stretching to obtain a second dispersed molten plastic.

6. The glass fiber pre-dispersing device for the production of long glass fiber reinforced thermoplastics according to claim 5, characterized in that: When the stretching dispersion component is not stretched for the first time, the stretching speed is less than the preset stretching speed; Among them, the extension speed of non-first stretching is negatively correlated with the number of stretching times.

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