A long fiber thermoplastic composite material impregnation equipment

Abstract

This invention discloses a linkage impregnation device for long-fiber thermoplastic composite materials, comprising a combined pushing device, a transition device, an impregnation fusion device, and a temperature control module. The combined pushing device includes a fluid material flow channel, a drive roller, and a driven roller. A scraper is positioned between the drive roller and the driven roller. The drive roller and the driven roller synchronously squeeze the scraper, continuously adhering to the drive roller while simultaneously pushing the material. During the pushing process, material adhesion to the drive roller and the driven roller is prevented. The material is continuously pushed forward through an arc-shaped concave-convex surface, effectively preventing fiber breakage. The impregnation fusion device includes a working chamber, with a driving device configured to drive the top and bottom extrusion linkage dies. Because the extrusion linkage dies employ a variable diameter and are arranged with concave-convex fits, they effectively prevent the long-fiber material from being torn and ensures uniform mixing of the molten material and the long-fiber material.

Description

Technical Field

[0001] This invention relates to the field of mixing, conveying and impregnation molding technology for long fiber reinforced thermoplastic composites, and particularly to a linkage impregnation equipment and operating method for long fiber reinforced thermoplastic composites. Background Technology

[0002] In the one-step production process of long fiber reinforced thermoplastic materials widely used in China, a large number of long fibers are torn during the shearing and mixing process of the long fiber material in the melting and plasticizing chamber. This results in an excessive number of short fibers and a small number of long fibers in the sheared fiber material. Consequently, the average fiber length in the injection molded product is difficult to meet the process requirements for strength and toughness of composite parts. Therefore, the mixing and conveying process after fiber shearing has become a major obstacle to further improving the performance of composite parts. As a result, a stable and continuous pushing mechanism is very necessary during the mixing and conveying process.

[0003] Meanwhile, the most commonly used process in the industrial field is extrusion melt impregnation. This method has simple equipment, high production efficiency, and can be continuously produced. However, it has problems such as high viscosity of thermoplastic resin matrix melt and difficulty in impregnating fibers, especially carbon fibers, which have small fiber diameters. Moreover, most of the sizing agents on the surface of commercial carbon fibers are designed for epoxy resin matrix, which has poor compatibility with thermoplastic resin, making it more difficult for the resin to impregnate carbon fibers. In addition, the long residence time in the mold will cause the resin to degrade and carbonize at high temperature, reducing the performance of the composite material. At the same time, the continuous high temperature conditions also result in relatively high energy consumption.

[0004] The shortcomings of existing technologies can be summarized as follows: 1. They cannot solve the problem of long fiber breakage during the mixing and conveying process after the fiber material is sheared; 2. They cannot achieve stable overall material conveying; 3. In the extrusion melt impregnation process, the high viscosity of the thermoplastic resin matrix melt makes it difficult to impregnate the fibers; 4. In the extrusion melt impregnation process, fiber breakage during fiber conveying should be avoided. Summary of the Invention

[0005] This invention aims to at least solve the following technical problems existing in the prior art or related technologies:

[0006] (1) The mixing and conveying of long fiber reinforced thermoplastic composites after shearing of long fiber materials in the prior art. During the conveying process, fiber breakage and material adhesion to high-temperature equipment should be avoided as much as possible to prevent material aging.

[0007] (2) In the prior art, long fiber reinforced thermoplastic composites are not impregnated and dispersed evenly in the mold structure, resulting in fiber breakage;

[0008] (3) Impregnation problems under high resin viscosity and temperature control problems of heat-sensitive aggregates in the prior art.

[0009] The solution disclosed in this invention is described as follows:

[0010] A long-fiber thermoplastic composite material linkage impregnation equipment includes at least a joint pushing device, a transition device, and an impregnation fusion device; the above devices are supported by a support device; both the joint pushing device and the impregnation fusion device are equipped with temperature control devices.

[0011] The combined propulsion device includes an upper module, a lower module, a transmission module, and a power unit; a fluid material flow channel is provided between the upper module and the lower module;

[0012] The upper module has an upper roller cavity, and the lower module has a lower roller cavity. When the two are combined, a transmission roller passes through and is fixed inside them. A driven roller is provided on the rear side of the transmission roller. Both the transmission roller and the driven roller have several arc-shaped concave and convex surfaces evenly distributed on their outer surfaces. A scraper is provided between the transmission roller and the driven roller. The transmission roller and the driven roller rotate in opposite directions, and they simultaneously squeeze the scraper to continuously adhere to the transmission roller. Both the upper module and the lower module are provided with heating devices.

[0013] The impregnation and fusion device includes a top layer mechanism and a bottom layer mechanism, which are connected together to form a working box. The working box is provided with a feed inlet and a discharge outlet. A height adjustment device is provided between the top layer mechanism and the bottom layer mechanism. The top layer mechanism and the bottom layer mechanism are respectively provided with a top extrusion pull linkage die head and a bottom extrusion pull linkage die head. A driving device is provided in conjunction with the working box to drive the top extrusion pull linkage die head and the bottom extrusion pull linkage die head. A pad is provided between the top layer mechanism and the bottom layer mechanism.

[0014] The power module is mounted on the upper or lower module and includes a speed-regulating drive device connected to the transmission module via a drive shaft. The transmission module is equipped with a drive gear and a transmission roller. Corresponding to the drive gear, a linkage module is mounted on its rear side. The linkage module includes a driven gear and a driven roller. The drive gear and the driven gear mesh to achieve reverse driving.

[0015] The drive gears are arranged in two positions, which are respectively arranged on the left and right sides of the transmission roller. There are also two driven gears, which mesh with the two drive gears respectively. Each driven gear is provided with a driven roller.

[0016] The upper module has a heating chamber at its top, which contains heating pipes that supply heat to the interior. The heating chamber is positioned directly above the fluid material flow channel and the upper roller cavity.

[0017] The lower module is equipped with several spiral heaters, which are used to heat the entire lower module.

[0018] The upper or lower module is provided with a heating zone at the material inlet to heat the material inlet.

[0019] The upper or lower module is provided with a guide groove, and the scraper is provided with a guide protrusion. The guide protrusion and the guide groove cooperate to guide the horizontal movement of the scraper.

[0020] The upper module is equipped with a hook on its top surface, which is used to lift the long fiber reinforced thermoplastic material mixing and linkage propulsion device.

[0021] Both the upper and lower modules are equipped with temperature detection ports, which measure temperature data to control the operation of the heating device.

[0022] The top-layer mechanism has an angled inner cavity and a synchronous extrusion groove at its bottom. The gap between the synchronous extrusion groove and the top extrusion drive die is 1-5mm, and the bottom of the top-layer mechanism has an inclination angle of 0-10°. Similarly, the bottom-layer mechanism has an angled inner cavity and a synchronous extrusion groove at its top. The gap between the synchronous extrusion groove and the bottom extrusion drive die is 1-5mm, and the top of the bottom-layer mechanism has an inclination angle of 0-10°. Several heating devices are installed inside the working chamber to heat the material running area within the working chamber.

[0023] The height adjustment device is located at the left and right ends of the top and bottom mechanisms, and includes upper and lower fixing plates, which are connected and fixed by adjusting bolts.

[0024] The top extrusion pull-linkage die head and the bottom extrusion pull-linkage die head are horizontally stacked and staggered, and the rotation directions of the top extrusion pull-linkage die head and the bottom extrusion pull-linkage die head are opposite.

[0025] The driving device is a single driving source, which directly realizes unidirectional driving of the top extrusion pulling die head or the bottom extrusion pulling die head through the driving gear. A driven gear is meshed with the driving gear. The driving gear and the driven gear are meshed in opposite directions.

[0026] The ends of the multiple top extrusion pull linkage dies and the bottom extrusion pull linkage dies are all equipped with driven sprockets. The multiple driven sprockets on the top extrusion pull linkage die are linked by a top chain; the multiple driven sprockets on the bottom extrusion pull linkage die are linked by a bottom chain; and tensioning devices are provided on both the top chain and the bottom chain.

[0027] The working chamber is equipped with several heating devices to heat the material running area inside the working chamber.

[0028] The shafts of both the top extrusion and bottom extrusion dies are hollow, and heaters are placed inside the shafts to heat the top and bottom extrusion dies.

[0029] The top extrusion pull-linkage die head is a variable-diameter rotating body structure with a smooth coarse-diameter area and a smooth fine-diameter area on its periphery; the bottom extrusion pull-linkage die head is a variable-diameter rotating body structure with a smooth coarse-diameter area and a smooth fine-diameter area on its periphery; the top extrusion pull-linkage die head and the bottom extrusion pull-linkage die head are complementaryly assembled, and the coarse-diameter area and the fine-diameter area are connected and complementary to achieve assembly.

[0030] Compared with existing technologies, the beneficial effects of this device are as follows:

[0031] This equipment includes a combined pushing device, a transition device, an impregnation and fusion device, and a temperature control module. The combined pushing device includes an upper module, a lower module, a transmission module, and a power module. A fluid material flow channel, a transmission roller, and a driven roller are provided between the upper module and the lower module. A scraper is provided between the transmission roller and the driven roller. The transmission roller and the driven roller rotate in opposite directions, and they simultaneously squeeze the scraper to continuously adhere to the transmission roller, thereby pushing the material. During the pushing process, the material is prevented from sticking to the transmission roller and the driven roller. The material is continuously pushed by the arc-shaped concave and convex surface, which can effectively prevent the fiber in the material from breaking.

[0032] The impregnation and fusion device includes a top layer mechanism and a bottom layer mechanism. The two layers are joined together to form a working box. A driving device is set in the working box to drive the top extrusion linkage die head and the bottom extrusion linkage die head inside. Because the extrusion linkage die head adopts a variable diameter and is arranged with concave and convex fits, it can effectively avoid the long fiber material being torn and uneven mixing. It can maximize the length of the long fiber material after shearing and mixing, and maximize the uniform mixing of the molten material and the long fiber material. It effectively improves the mechanical strength, high temperature performance and impact resistance of the long fiber composite material product.

[0033] This device is also equipped with temperature control modules in both the joint propulsion device and the impregnation and fusion device. The temperature control modules enable precise control of the working temperature of each working part, avoiding the degradation and carbonization of the resin at inappropriate high temperatures due to prolonged residence time in the mold, which would reduce the performance of the composite material product. At the same time, it avoids continuous high temperature conditions and reduces energy consumption. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0035] Figure 2 This is a schematic diagram of the internal structure of the present invention from the main view.

[0036] Figure 3 This is a three-dimensional structural diagram of the combined propulsion device of the present invention;

[0037] Figure 4 This is a schematic diagram of the main cross-sectional structure of the combined propulsion device of the present invention;

[0038] Figure 5 This is a schematic diagram of the internal three-dimensional structure of the combined propulsion device of the present invention;

[0039] Figure 6 for Figure 2 Enlarged schematic diagram of the cross-sectional structure of region A in the middle;

[0040] Figure 7 for Figure 2 Enlarged schematic diagram of the cross-sectional structure of region B in the middle;

[0041] Figure 8 for Figure 2 Enlarged schematic diagram of the cross-sectional structure of region C in the middle;

[0042] Figure 9 for Figure 5 Enlarged schematic diagram of the cross-sectional structure of region D in the middle;

[0043] Figure 10 A schematic diagram of the control system for the combined propulsion device;

[0044] Figure 11 This is a schematic diagram of the control system for the impregnation and fusion device;

[0045] Figure 12 This is a schematic diagram of the assembly structure of the top extrusion pull-linkage die head and the bottom extrusion pull-linkage die head;

[0046] Figure 13 This is a schematic diagram of the top assembly structure of the top extrusion pultrusion die and the bottom extrusion pultrusion die;

[0047] Figure 14 A schematic diagram of the cross-sectional structure of the top extrusion pultrusion die and the bottom extrusion pultrusion die assembly;

[0048] Figure 15 This is a schematic diagram of the main cross-section structure of the impregnation and fusion device;

[0049] Figure 16 This is a schematic diagram of the inclined structure of the inner cavity of the top and bottom mechanisms.

[0050] In the diagram, 1 is the support frame, 10 is the horizontal buffer pad, 101 is the vertical elastic composite, 102 is the vertical support, 103 is the vertical plastic support, 11 is the vertical buffer pad, 111 is the horizontal elastic composite, 112 is the horizontal plastic support, 12 is the impregnation molding controller, 121 is the inlet temperature sensing point, 122 is the outlet temperature sensing point, 13 is the mixing and conveying controller, 131 is the front temperature sensing point, 132 is the rear temperature sensing point, 2 is the combined pushing device, 21 is the feeding heating chamber, 211 is the heating chamber. 22. Heat pipe; 221. Transmission module; 222. Transmission roller; 223. Drive shaft; 224. Outer drive gear; 225. Inner drive gear; 23. Linkage module; 231. Outer driven roller; 232. Inner driven roller; 233. Bushing fixing seat; 234. Outer driven gear; 235. Inner driven gear; 24. Upper module; 240. Upper roller cavity; 241. Fluid material flow channel; 25. Lower module; 250. Lower roller cavity; 251. Lower module temperature detection. Measuring point, 26. Spiral heater, 261. Connecting thread, 262. Central heating core, 27. Moving area, 271. Guide groove, 28. Feed inlet, 281. Feed heating area, 29. Discharge outlet, 3. Transition device, 4. Impregnation and fusion device, 41. Top layer mechanism, 411. Upper driven sprocket, 412. Top chain, 413. Tensioner pulley, 414. Drive gear, 415. Impregnation feed inlet, 416. Impregnation discharge outlet, 417. Top extrusion pulley, 418. Heightening shim, 419. Upper same 42. Bottom extrusion groove, 421. Lower driven sprocket, 422. Bottom chain, 423. Lower tensioning wheel, 424. Driven gear, 425. Bottom extrusion linkage die head, 426. Spiral heater, 427. Lower synchronous extrusion groove, 5. Push drive motor, 51. Immersion drive motor, 6. Scraper body, 61. Transmission roller scraper, 62. Side scraper, 63. Guide protrusion, 7. Roll forming device, 8. Adjusting bolt, 9. Die head body, 91. Rough diameter area, 92. Fine diameter area, 93. Heating chamber. Detailed Implementation

[0051] The following specific embodiments illustrate the implementation of the present invention.

[0052] A long-fiber thermoplastic composite material impregnation device, such as Figure 1 and Figure 2As shown, it includes a support frame 1, which supports and fixes the combined pushing device 2, the transition device 3, and the impregnation and fusion device 4. A roll cutting forming device 7 is connected to the rear side of the impregnation and fusion device 4 to cut the forming material.

[0053] Because this device is composed of interconnected modules, each module functions independently. To facilitate understanding of this technical solution by those skilled in the art, the structure and independent operation of each module are described below:

[0054] During operation, this equipment uses a combined pushing device to extrude and convey materials, while minimizing fiber breakage and material adhesion to high-temperature equipment to prevent aging. Its specific structure and operation are described below: The combined pushing device 2 includes an upper module 24, a lower module 255, a transmission module 22, and a push drive motor 5. The upper module 24 and lower module 255 are connected vertically and sealed by a sealing device. An upper groove is provided between the upper module 24 and lower module 255, forming a fluid material flow channel 241. In front of the fluid material flow channel 241, the upper module 24 contains an upper roller cavity 240, and the lower module 255 contains a lower roller cavity 250. When combined, the upper module 24 contains a transmission roller 221 fixed within it. Two driven rollers are located behind the transmission roller 221, spaced apart.

[0055] Both the drive roller 221 and the driven roller have several evenly distributed arc-shaped concave and convex surfaces on their outer surfaces. A scraper 6 is disposed between the drive roller and the driven roller. When the drive roller 221 and the driven roller rotate simultaneously, while the drive roller 221 pushes the material backward, the arc-shaped concave and convex surfaces on the outer driven roller 231 and the inner driven roller 232 synchronously squeeze and adhere the scraper to the drive roller 221, removing the material that has been heated and adhered to the drive roller 221 and preventing it from sticking to the drive roller 221. Heating devices are installed on both the upper module 24 and the lower module 25 of this device to provide the operating temperature for the entire equipment.

[0056] With the above structure set up, the device achieves synchronous reverse rotation of the transmission roller 221 and the driven roller under the drive of the drive motor 5, thereby achieving the same-direction drive of the material and simultaneously clearing the material from the transmission roller 221.

[0057] This technical solution provides a simpler driving method, the purpose of which is to achieve synchronous reverse rotation of the transmission roller 221 and the driven roller under the drive of a single power module. The specific driving principle is as follows: the drive motor 5 is mounted on the lower module 25, and a drive shaft 223 extends from the gearbox of the drive motor 5. The drive shaft 223 is connected to the transmission module 22, as shown below. Figure 5 , 9 As shown, the transmission module 22 is equipped with an outer drive gear 224 and an inner drive gear 225, with a transmission roller 221 positioned between them. The transmission roller 221 is located between the upper roller cavity 240 and the lower roller cavity 250. The outer drive gear 224 and the inner drive gear 225 are fixed to the left and right sides of the lower module 25.

[0058] Corresponding to the outer drive gear 224 and the inner drive gear 225, two linkage modules 23 are provided on their rear sides. These linkage modules 23 are symmetrically fixed to the lower module 25 via bushing fixing seats 233. Each linkage module 23 is equipped with a driven roller and a driven gear, namely an outer driven roller 231, an inner driven roller 232, an outer driven gear 234, and an inner driven gear 235. The outer driven gear 234 and the inner driven gear 235 mesh with the outer drive gear 224 and the inner drive gear 225 respectively to achieve drive. It should be noted that the meshing of the drive gear and the driven gear here is a non-standard gear meshing, requiring reverse drive to achieve rotation of the outer driven roller 231 and the inner driven roller 232 in the opposite direction to the transmission roller 221. To ensure the horizontal stability of the scraper body 6 during driving, the lower module 25 is provided with an active area 27, within which a guide groove 271 is provided. The scraper body 6 is provided with a transmission roller scraper 61 and a guide protrusion 63. The guide protrusion 63 is matched with the guide groove 271, and the horizontal movement of the transmission roller scraper 61 is guided by the cooperation of the two. Figure 6 As shown, the scraping body 6 includes a transmission roller scraper 61 and side scrapers 62 on the left and right sides. There is a guide protrusion 63 on the rear side of the side scraper 62. The side scrapers 62 are pressed against the outer driven roller 231 and the inner driven roller 232 respectively. The transmission roller scraper 61 is pressed against the transmission roller 221, so that the entire scraping body 6 moves horizontally within the active area 27.

[0059] Through the above driving structure, the outer driven roller 231, the inner driven roller 232, and the transmission roller 221 can be synchronously rotated simultaneously under the same driving source. Furthermore, the rotation directions of the outer driven roller 231 and the inner driven roller 232 are opposite to the rotation direction of the transmission roller 221, achieving unidirectional force application to the material. In a further technical improvement, a feeding heating zone 281 is provided at the feed inlet at the junction of the upper module 24 and the lower module 25. A spiral heater 26 is inserted into the feeding heating zone 281, achieving the first stage of heating.

[0060] The upper module 24 has a feeding heating chamber 21 at its top, which contains several heating pipes 211 that supply heat to the inside of the feeding heating chamber 21. The feeding heating chamber 21 is located directly above the fluid material flow channel 241 and the upper roller cavity 240, and it provides temperature assurance during material flow.

[0061] Several spiral heaters 26 are horizontally fixed on the lower module 25, and the overall heating of the lower module 25 is achieved through the spiral heaters 26. In order to cooperate with the normal operation of the above heating device, the device has a front temperature sensing point 131 and a rear temperature sensing point 132 fixed on the feed inlet 28 and the discharge outlet 29, respectively, and connected to the mixing and conveying controller 13. The mixing and conveying controller 13 enables flexible control of the heating of the feed heating zone 281, the feed heating chamber 21 and the spiral heaters 26.

[0062] The spiral heater 26 described above, as Figure 14 As shown, it has a long rod-shaped structure, including a rod-shaped spiral heating body. The outer diameter of the spiral heating body has a connecting thread 261. Each part is provided with a central heating core 262, which can be connected to an external heating wire or external heat transfer oil to heat the central heating core 262. The connecting thread 261, as an annular protrusion, can effectively improve the heating efficiency.

[0063] During operation, this equipment achieves the fusion of fibers and viscous molten materials through the impregnation and fusion device 4. Simultaneously, it addresses the issues of uneven impregnation and dispersion of materials within the mold structure during the melting process, preventing fiber breakage. It also solves the impregnation problem under high resin viscosity and the temperature control problem for heat-sensitive aggregates. Its specific structure and operation mode are described below:

[0064] The impregnation and fusion device 4 includes a top layer mechanism 41 and a bottom layer mechanism 42 with a square structure. The two layers are joined together and locked to form a working box. The working box is provided with an impregnation inlet 415 and an impregnation outlet 416. A height adjustment device is provided between the top layer mechanism 41 and the bottom layer mechanism 42. It is used to fine adjust the size of the working chamber inside the working box to adapt to the extrusion and conveying of materials with different viscosities.

[0065] As described above, the bottom of the top layer mechanism 41 is provided with an inner cavity, and the inner cavity is provided with an oblique angle from left to right. Several upper synchronous extrusion grooves 419 are evenly distributed on the bottom of the body of the top layer mechanism 41. The gap between the upper synchronous extrusion grooves 419 and the top extrusion linkage die head 417 is 2 mm. The tilt angle of the bottom of the body of the top layer mechanism 41 is 0-10°, and a 5° angle is preferred in this embodiment.

[0066] As described above, the top of the bottom layer mechanism 42 also has an inner cavity, which is angled from left to right. The top of the body of the bottom layer mechanism 42 has a lower synchronous extrusion groove 427, the gap between the lower synchronous extrusion groove 427 and the bottom extrusion linkage die head 425 is 2 mm, and the bottom inclination angle of the body of the bottom layer mechanism 42 is 0-10°, preferably 5° in this embodiment. The inclination states of the bottom layer mechanism 42 and the top layer mechanism 41 described above are as follows: Figure 15 , 16 As shown.

[0067] The aforementioned 2 mm gap allows materials adhering to the top extrusion joint die 417 and the bottom extrusion joint die 425 to be scraped off by the synchronous extrusion groove, preventing excessive material adhesion.

[0068] With the above structural configuration, in the embodiments of this application, the top layer mechanism 41 and the bottom layer mechanism 42, when combined, form a channel between them that can accommodate the flow of molten material. The channel shape is bucket-shaped or trumpet-shaped, and the direction of the opening (right side opening) is along the direction of material flow. The synchronous extrusion groove is a smooth and regular concave-convex arc surface, which respectively matches the outer contour of the top extrusion linkage die 417 and the bottom extrusion linkage die 425. The molten material and long fiber material enter the flow channel of the long fiber impregnation and mixing device through the impregnation feed port 415. In the flow channel, the molten mixture is repeatedly extruded by one or more top extrusion linkage dies 417 and bottom extrusion linkage dies 425 to fully ensure that the molten material and long fiber material are fully impregnated and mixed. After impregnation and mixing, the molten mixture enters the next process through the impregnation discharge port 416.

[0069] This device, in conjunction with the working housing, is equipped with a drive motor to drive the top extrusion linkage die head 417 and the bottom extrusion linkage die head 425. Because this device has the function of fine-tuning the size of the working cavity inside the working housing, a height-increasing shim 418 is provided between the top layer mechanism 41 and the bottom layer mechanism 42. The height-increasing shim 418 allows for fine-tuning of the joint seam of the working housing. To achieve the aforementioned fine-tuning function, the height adjustment device is located at the four corners on both the left and right ends of the joint between the top layer mechanism 41 and the bottom layer mechanism 42. Correspondingly, upper and lower fixing plates are provided at each of the four corners of both the top layer mechanism 41 and the bottom layer mechanism 42, and these upper and lower fixing plates are connected and fixed together by adjusting bolts 8.

[0070] Furthermore, the overall structure of the top extrusion pull-linkage die head 417 and the bottom extrusion pull-linkage die head 425 disclosed in this device is the same, such as... Figure 12-16 As shown, both types of pultrusion dies are variable-diameter rotating structures, each including a die body 9. The die body 9 has a smooth coarse-diameter area 91 and a smooth fine-diameter area 92. During assembly, the top pultrusion die 417 and the bottom pultrusion die 425 are assembled complementaryly, with the coarse-diameter area 91 and the fine-diameter area 92 mating together for assembly. Figure 12 , 13 As shown, the top extrusion pull-linkage die 417 is on top, and the bottom extrusion pull-linkage die 425 is on the bottom. The coarse diameter area 91 of the top extrusion pull-linkage die 417 corresponds to the fine diameter area 92 of the bottom extrusion pull-linkage die 425, and the fine diameter area 92 of the top extrusion pull-linkage die 417 corresponds to the coarse diameter area 91 of the bottom extrusion pull-linkage die 425. The upper and lower double-layer die bodies 9 are assembled by overlapping the coarse and fine diameter areas. The center distance between the top extrusion pull-linkage dies is 100-200mm, and the center distance between the bottom extrusion pull-linkage dies is 100-200mm. The specific assembly structure is adjusted within this range.

[0071] In operation, the horizontally stacked, staggered top extrusion pull-linkage die head 417 and bottom extrusion pull-linkage die head 425 rotate in opposite directions. This structure achieves material driving in the same direction and maximizes the stretching and kneading of the material in a gentle state to mix it with the fibers, avoiding the unnecessary cutting of long fibers. To achieve the above actions, in this embodiment, two sets of drive systems can be set to independently drive the top extrusion pull-linkage die head 417 and bottom extrusion pull-linkage die head 425. However, this driving method is not suitable for confined equipment spaces.

[0072] To improve upon the above, in this embodiment, the driving device is a single driving source, such as... Figure 1 , 2As shown, the immersion drive motor 51 drives the drive gear 414 to directly realize the unidirectional drive of the extrusion and pulling linkage die head 417. The drive gear 414 is meshed with a driven gear 424. The drive gear 414 and the driven gear 424 are reversible meshing and rotate in opposite directions (opposite rotation, same driving force direction).

[0073] With the above structural configuration, the linkage structure of the top extrusion linkage die 417 and the bottom extrusion linkage die 425 is described as follows: Taking the top extrusion linkage die 417 as an example, each end of the multiple top extrusion linkage dies 417 is provided with an upper driven sprocket 411, and the multiple upper driven sprockets 411 on the top extrusion linkage die are linked around each other by the top chain 412. The bottom extrusion linkage die uses the same structure to achieve linkage driven by the bottom chain 422. Both the top chain 412 and the bottom chain 422 are provided with tensioning devices, namely an upper tensioning wheel 413 and a lower tensioning wheel 423, which have the same structure and each includes a tensioning wheel support frame for connection with the side wall of the working box. The upper tensioning wheel 413 and the lower tensioning wheel 423 are respectively fixed on the chain to achieve chain tension support and prevent the chain from loosening.

[0074] like Figure 11 As shown, further technical optimizations are made to the long glass fiber reinforced thermoplastic material melt impregnation and extrusion device optimized in this application. Multiple temperature sensing devices (inlet temperature sensing point 121 and outlet temperature sensing point 122) are set on the inlet transition device 3 at the front end of the long fiber impregnation mixing device and at the impregnation outlet 416. These devices are connected to the impregnation molding controller 12 through multi-point fixed sensors. The impregnation molding controller 12 connects to multiple spiral heaters 26 of the top layer mechanism 41 and the bottom layer mechanism 42 to achieve heating control. Through multi-point detection and multi-point heating, the overall temperature of the working area can reach the temperature requirements when conveying different molten materials.

[0075] To further improve heating efficiency, the shafts of the top extrusion pull linkage die 417 and the bottom extrusion pull linkage die 425 are both hollow, with a spiral heater 26 placed inside.

[0076] Furthermore, when the lifting height of the long fiber impregnation and mixing device needs to be adjusted, the top layer mechanism 41 is first raised using hoisting equipment, while the bottom layer mechanism 42 remains stationary. One or more lifting shims 418 are placed between the top layer mechanism 41 and the bottom layer mechanism 42 according to the required lifting height to control the height adjustment. Once the gap between the top layer mechanism 41 and the bottom layer mechanism 42 is determined, the locking position is achieved by adjusting the bolts 8. Based on the above description, those skilled in the art can implement this procedure themselves.

[0077] This device also aims to improve the stability of equipment operation, such as... Figure 2 As shown, a horizontal buffer pad 10 and a vertical buffer pad 11 are respectively provided between the pushing device 2 and the support frame, between the pushing device 2 and the transition device 3, and between the transition device 3 and the impregnation and fusion device 4. The horizontal buffer pad 10 includes a vertical elastic composite 101, a vertical support 102, and a vertical plastic support 103. The vertical buffer pad 11 includes a horizontal elastic composite 111, a horizontal plastic support 112, and a horizontal plastic support 113. Through the use of the above horizontal and vertical buffer components, they can work together to offset the horizontal force generated during the operation of the combined pushing device 2 and the impregnation and fusion device 4; at the same time, they are also used to offset the vertical force generated during the operation between the combined pushing device 2 and the transition device 3, and between the transition device 3 and the impregnation and fusion device 4.

[0078] In this device, the transition device 3 is used to connect the combined pushing device 2 and the impregnation and fusion device 4, and maintains the temperature during the material conversion process through the heat preservation structure, ensuring that the temperature of the molten mixture is maintained at 200-250℃ during the fluid transition conversion process, thus providing stable conditions for stable material processing.

Claims

1. A long-fiber thermoplastic composite material impregnation device, characterized in that: It includes at least a combined propulsion device, a transition device, and an impregnation and fusion device; both the combined propulsion device and the impregnation and fusion device are equipped with temperature control devices; The combined propulsion device includes an upper module, a lower module, a transmission module, and a power device; a fluid material flow channel is provided between the upper and lower modules; both the upper and lower modules have roller cavities inside, with a fixed transmission roller passing through the roller cavity; a driven roller is provided behind the transmission roller, and both the transmission roller and the driven roller have several evenly distributed arc-shaped concave and convex surfaces on their outer surfaces; a scraper is provided between the transmission roller and the driven roller, and the transmission roller and the driven roller rotate in opposite directions, synchronously squeezing the scraper to continuously adhere to the transmission roller; both the upper and lower modules are equipped with heating devices; The power unit is mounted on the upper or lower module and is connected to the transmission module via a drive shaft. The transmission module is equipped with a drive gear and a transmission roller. Corresponding to the drive gear, a linkage module is mounted on its rear side. The linkage module includes a driven gear and a driven roller. The drive gear and the driven gear mesh to achieve reverse drive. The upper or lower module is provided with a guide groove, and the scraper is provided with a guide protrusion. The guide protrusion cooperates with the guide groove to guide the scraper to move horizontally. The impregnation and fusion device includes a working box composed of a top layer mechanism and a bottom layer mechanism. The working box is provided with a feed inlet and a discharge outlet. The top layer mechanism and the bottom layer mechanism are respectively provided with a top extrusion pull linkage die head and a bottom extrusion pull linkage die head. A driving device is provided in conjunction with the working box to drive the top extrusion pull linkage die head and the bottom extrusion pull linkage die head. The inner cavities of the top layer mechanism and the bottom layer mechanism are provided with bevels. Both the top layer mechanism and the bottom layer mechanism are provided with synchronous extrusion grooves to fix the top extrusion pull linkage die head and the bottom extrusion pull linkage die head. The top extrusion pull linkage die and the bottom extrusion pull linkage die are horizontally stacked and staggered, and the rotation directions of the top extrusion pull linkage die and the bottom extrusion pull linkage die are opposite. The top extrusion pull-linkage die head is a variable-diameter rotating body structure with a smooth coarse-diameter area and a smooth fine-diameter area on its periphery; the bottom extrusion pull-linkage die head is a variable-diameter rotating body structure with a smooth coarse-diameter area and a smooth fine-diameter area on its periphery; the top extrusion pull-linkage die head and the bottom extrusion pull-linkage die head are assembled in a complementary manner.

2. The long fiber thermoplastic composite material impregnation equipment according to claim 1, characterized in that: The drive gears are arranged in two positions, which are respectively arranged on the left and right sides of the transmission roller. There are also two driven gears, which mesh with the two drive gears respectively. Each driven gear is provided with a driven roller.

3. The long fiber thermoplastic composite material impregnation equipment according to claim 1, characterized in that: The driving device is a single driving source, which directly realizes unidirectional driving of the top extrusion pulling die head or the bottom extrusion pulling die head through the driving gear. A driven gear is meshed with the driving gear, and the driving gear and the driven gear are configured to reversible mesh.

4. The long fiber thermoplastic composite material impregnation equipment according to claim 1, characterized in that: Each of the aforementioned top extrusion pull linkage die head and bottom extrusion pull linkage die head is provided with a driven sprocket at its end. The multiple driven sprockets on the top extrusion pull linkage die head are linked together by a top chain; the multiple driven sprockets on the bottom extrusion pull linkage die head are linked together by a bottom chain; and tensioning devices are provided on both the top chain and the bottom chain.

5. The long fiber thermoplastic composite material impregnation equipment according to claim 1, characterized in that: The working chamber is equipped with several heating devices to heat the material running area inside the working chamber.

6. The long fiber thermoplastic composite material impregnation equipment according to claim 1, characterized in that: The shafts of both the top extrusion and bottom extrusion dies are hollow, and heaters are placed inside the shafts.

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