A twin-screw extruder for preparing a special compatibilizer for thermoplastic composites

Abstract

The utility model relates to the technical field of double screw extruder provides a special compatibilizer preparation of thermoplastic composite double screw extruder, including the tail, the one end of tail evenly is provided with the connecting barrel, the connecting barrel is away from the tail one end and is provided with the machine head, the inner wall of connecting barrel all is fixed with heating assembly, the inside of connecting barrel all is provided with screw rod structure, the both ends of connecting barrel all are fixed with the connecting structure, the outside of connecting structure all is provided with the protection structure. The utility model discloses is provided with the protection structure, and the upper protection cover and the lower protection cover of semicircular shape form a protection cover, and the key connecting part is wrapped up, can effectively prevent the erosion of water vapor, rain, dust or chemical substance in the environment to bolt and flange face, realizes the device convenient to the protection of connecting structure has the function, improves the convenience of the special compatibilizer preparation of thermoplastic composite double screw extruder when using.

Description

Technical Field

[0001] This utility model relates to the field of twin-screw extruder technology, and in particular to a twin-screw extruder for preparing compatibilizers for thermoplastic composite materials. Background Technology

[0002] With the surge in demand for lightweight, high-performance thermoplastic composites in the automotive, aerospace, and other fields, the interfacial bonding problem between the core components—the incompatible resin matrix and the reinforcing fillers / fibers—has become a key bottleneck restricting the improvement of material performance. Compatibilizers, acting as the "molecular bridge" to solve this problem, directly determine the final performance of the composite material. Traditional compatibilizer preparation methods, such as solution methods, suffer from high pollution and energy consumption; while ordinary extrusion equipment faces challenges such as incomplete reaction, imprecise process control, and difficulty in continuous production when used for compatibilizer preparation. Therefore, it is necessary to design a twin-screw extruder specifically for preparing compatibilizers for thermoplastic composites. To address this, patent CN201960728U discloses a twin-screw extruder, belonging to the field of plastic machinery manufacturing. Currently, there is no twin-screw extruder with a simple structure, reasonable design, and two screws of different lengths. This utility model includes a drive motor, a distribution box with a drive gear and a driven gear, a reduction gearbox, a barrel, an exhaust system, a hopper, a feeding system, and a frame. The drive motor, distribution box, reduction gearbox, and barrel are all mounted on the frame. The reduction gearbox is connected to the drive motor, and the drive gear in the distribution box is connected to the reduction gearbox. The drive gear and driven gear mesh. The feeding system is connected to the barrel, and the exhaust system is mounted on the barrel. Its distinguishing feature is that it also includes a long screw and a short screw respectively mounted on the drive gear and the driven gear, both located within the barrel. This utility model has a reasonable structural design, scientific layout, stable pressure, and good extrusion performance, combining the advantages of a single-screw extruder and a twin-screw extruder. Although the twin-screw extruders mentioned above can be easily combined with single-screw and twin-screw extruders during use, the connection point is easily eroded by rainwater, affecting the stability of the connection. Therefore, it is necessary to design a twin-screw extruder for preparing compatibilizers for thermoplastic composite materials. Utility Model Content

[0003] The purpose of this invention is to provide a twin-screw extruder for preparing compatibilizers for thermoplastic composite materials, in order to solve the defect of existing twin-screw extruders that are easily eroded by rainwater at the joint, affecting the stability of the joint.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a twin-screw extruder for preparing a compatibilizer for thermoplastic composite materials, including a tail section; A connecting cylinder is evenly provided at one end of the tail section, and a machine head is provided at the end of the connecting cylinder away from the tail section. Heating components are fixed on the inner wall of each connecting cylinder, and screw structures are provided on the inner side of each connecting cylinder. Both ends of the connecting cylinder are fixed with connecting structures, and protective structures are provided on the outer side of the connecting structures. The protective structures include an upper protective cover located below the connecting structures, and a lower protective cover located above the upper protective cover. A connecting block is fixed to one end of both the upper and lower protective covers, and a connecting bolt passes through the interior of each connecting block.

[0005] Preferably, a discharge pipe is fixed at the bottom of the tail section and a feed hopper is fixed at the top of the head section.

[0006] Preferably, the screw structure includes a central shaft evenly arranged inside the connecting cylinder, with helical blades fixed on the outer wall of the central shaft. The screw structure also includes a gear evenly rotatably connected to the outer wall of one end of the machine head, and a servo motor fixed to the outer wall of the machine head below the gear.

[0007] Preferably, the spiral blades are symmetrically distributed on both sides of the connecting cylinder, one end of the central shaft extends into the interior of the tail and is rotatably connected to the tail, the other end of the central shaft extends into the exterior of the head and is fixedly connected to one side of the gear, and the output end of the servo motor is fixedly connected to one side of the gear.

[0008] Preferably, the heating assembly includes a heating base, a heating cavity, and a heating wire. The heating base is fixed to the inner wall of the connecting cylinder, and each heating base has a heating cavity inside, with a heating wire inside each heating cavity.

[0009] Preferably, the connecting structure includes a first connecting plate, a second connecting plate, a third connecting plate, and bolts. The first connecting plate is fixed to the outer wall of both ends of the connecting cylinder, the second connecting plate is fixed to the outer wall of the machine head near the end of the connecting cylinder, and the third connecting plate is fixed to the outer wall of the machine tail near the end of the connecting cylinder. Bolts penetrate the interior of each of the first connecting plates.

[0010] Preferably, the first connecting plate and the second connecting plate are fixedly connected by bolts, and the first connecting plate and the third connecting plate are fixedly connected by bolts.

[0011] Preferably, the upper protective cover and the lower protective cover are hinged at the ends away from the connecting block, and the side view cross-section of the upper protective cover and the lower protective cover is semi-circular.

[0012] This utility model provides a twin-screw extruder for preparing compatibilizers for thermoplastic composite materials, which has the following advantages: By incorporating a protective structure, the upper and lower protective covers, which are semi-circular in shape, form a protective shield that encloses the critical connection points. This effectively prevents moisture, rain, dust, or chemicals in the environment from corroding the bolts and flange surfaces, thus solving the problem of "connections being easily corroded by rain" mentioned in the background technology. The protective shield prevents personnel from accidentally coming into contact with high temperatures or moving parts, improving operational safety. The design, with one end hinged and the other end fixed by a component, allows the protective shield to be easily opened like a door, facilitating regular inspection of the connection status or tightening operations. This makes maintenance convenient and enables the device to protect the connection structure, improving the ease of use of the twin-screw extruder for preparing thermoplastic composite material compatibilizers. By incorporating a connecting structure, the first, second, and third connecting plates ensure a tight connection between the various sections of the barrel, effectively preventing material leakage under high pressure, ensuring clean production and high material utilization. The modular design makes the disassembly and assembly of components such as the barrel sections and screw more convenient, facilitating cleaning, screw configuration replacement, or equipment maintenance, greatly reducing downtime. This enables the device to be easy to assemble, disassemble, and maintain, improving the convenience and efficiency of the twin-screw extruder for preparing thermoplastic composite material compatibilizers. By incorporating a screw structure and heating components, the central shaft and helical blades provide strong shearing and kneading effects during rotation, ensuring thorough mixing and reaction of the base polymer with reactive monomers, initiators, and other components. This improves the grafting rate and reaction rate of the compatibilizer. The presence of two sets of heating components facilitates temperature control of each set, enabling zoned temperature management and ensuring the material is at its optimal process temperature at each reaction stage. This design facilitates material mixing and heating, enhancing the efficiency of the twin-screw extruder used for preparing thermoplastic composite compatibilizers. Attached Figure Description

[0013] Figure 1 This is a three-dimensional schematic diagram of the entire utility model; Figure 2 This is a schematic front sectional view of the present invention; Figure 3 This is a three-dimensional perspective view of the main cross-section of this utility model; Figure 4 This is a three-dimensional side view sectional diagram of the present invention. Figure 5 This is a top view cross-sectional three-dimensional schematic diagram of the present invention; Figure 6 This is a top sectional view of the present invention.

[0014] The following are the annotations in the diagram: 1. Tail end; 2. Screw structure; 21. Central shaft; 22. Spiral blade; 23. Gear; 24. Servo motor; 3. Connecting cylinder; 4. Heating assembly; 41. Heating seat; 42. Heating chamber; 43. Heating wire; 5. Connecting structure; 51. First connecting plate; 52. Second connecting plate; 53. Third connecting plate; 54. Bolt; 6. Protective structure; 61. Upper protective cover; 62. Lower protective cover; 63. Connecting block; 64. Connecting bolt; 7. Feed hopper; 8. Machine head; 9. Discharge pipe. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1-6 The present invention provides a twin-screw extruder for preparing a compatibilizer for thermoplastic composite materials, including a tail section 1.

[0017] Reference Figures 2-6 As shown, a connecting cylinder 3 is evenly arranged at one end of the tail 1, and a machine head 8 is arranged at the end of the connecting cylinder 3 away from the tail 1. A discharge pipe 9 is fixed at the bottom of the tail 1, and a feed hopper 7 is fixed at the top of the machine head 8. A heating component 4 is fixed on the inner wall of the connecting cylinder 3. The heating component 4 includes a heating seat 41, a heating chamber 42 and a heating wire 43. The heating seats 41 are all fixed on the inner wall of the connecting cylinder 3. A heating chamber 42 is opened inside the heating seat 41, and a heating wire 43 is arranged inside the heating chamber 42.

[0018] When an external power source is connected, the heating wire 43 is activated. The heat generated by the heating wire 43 is transferred to the inner side of the heating base 41 through the heating base 41. The heat is conducted to the material, causing it to melt and maintain at the set temperature. A temperature sensor is installed on the inner wall of the heating base 41 to monitor the barrel temperature in real time and feed the signal back to the temperature control system. The temperature control system switches on or off or adjusts the power of the heating wire 43 according to the difference between the set value and the feedback value, thereby achieving closed-loop precise temperature control.

[0019] Reference Figures 1-6As shown, a screw structure 2 is provided on the inner side of the connecting cylinder 3. The screw structure 2 includes a central shaft 21 evenly distributed on the inner side of the connecting cylinder 3. Spiral blades 22 are fixed on the outer wall of the central shaft 21. The screw structure 2 also includes a gear 23 evenly rotatably connected to the outer wall of one end of the machine head 8. The screw structure 2 also includes a servo motor 24 fixed to the outer wall of the machine head 8 below the gear 23. The spiral blades 22 are symmetrically distributed on both sides of the connecting cylinder 3. One end of the central shaft 21 extends into the interior of the tail 1 and is rotatably connected to the tail 1. The other end of the central shaft 21 extends into the exterior of the machine head 8 and is fixedly connected to one side of the gear 23. The output end of the servo motor 24 is fixedly connected to one side of the gear 23.

[0020] When an external power source is connected and the servo motor 24 is started, the rotation of the servo motor 24 will drive the gear 23 to rotate. When the gear 23 rotates, it will drive the other gear 23 on one side to rotate. The rotation of the gear 23 will drive the central shaft 21 and the spiral blade 22 to rotate in opposite directions. This can help ensure that the central shaft 21 and the spiral blade 22 rotate synchronously and in opposite directions, so as to achieve a stable mixing and conveying process.

[0021] Reference Figures 1-6 As shown, both ends of the connecting cylinder 3 are fixed with connecting structures 5. The connecting structure 5 includes a first connecting plate 51, a second connecting plate 52, a third connecting plate 53, and bolts 54. The first connecting plates 51 are fixed to the outer walls of both ends of the connecting cylinder 3. The second connecting plate 52 is fixed to the outer wall of the machine head 8 near the end of the connecting cylinder 3. The third connecting plate 53 is fixed to the outer wall of the machine tail 1 near the end of the connecting cylinder 3. Bolts 54 penetrate the interior of each first connecting plate 51. The first connecting plate 51 and the second connecting plate 52 are fixedly connected by bolts 54. 51 and the third connecting plate 53 are fixedly connected by bolts 54. A protective structure 6 is provided on the outside of the connecting structure 5. The protective structure 6 includes an upper protective cover 61 located below the connecting structure 5. A lower protective cover 62 is provided above the upper protective cover 61. A connecting block 63 is fixed to one end of the upper protective cover 61 and the lower protective cover 62. A connecting bolt 64 passes through the inside of the connecting block 63. The ends of the upper protective cover 61 and the lower protective cover 62 away from the connecting block 63 are hinged. The side view cross section of the upper protective cover 61 and the lower protective cover 62 is semi-circular.

[0022] The first connecting plate 51 is fixed to the end of the connecting cylinder 3. The second connecting plate 52 and the third connecting plate 53 are fixed to one end of the head 8 and the tail 1, respectively, and are aligned with the first connecting plate 51. The first connecting plate 51 and the second connecting plate 52, and the first connecting plate 51 and the third connecting plate 53 can be fixedly connected by bolts 54, pressing the components tightly together. Under the pre-tightening force of the bolts 54, due to the sealing ring between the sealing surfaces of the flanges, sufficient contact pressure is generated between the sealing surfaces, forming a reliable static seal. The upper protective cover 61 and the lower protective cover 62 are connected by hinges and can be closed to form a complete cylindrical protective cover, completely covering the connecting flange and bolts 54. When maintenance is required, simply loosen the connecting bolts 64 to lift the lower protective cover 62 around the hinge point to expose the internal connecting structure 5. After the operation is completed, the upper part is closed and locked with the connecting bolts 64.

[0023] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A twin-screw extruder for preparing compatibilizers for thermoplastic composites, comprising a tail section (1); Its features are: A connecting cylinder (3) is evenly provided at one end of the tail (1), and a machine head (8) is provided at the end of the connecting cylinder (3) away from the tail (1). Heating components (4) are fixed on the inner wall of each connecting cylinder (3), and screw structures (2) are provided on the inner side of each connecting cylinder (3). Both ends of the connecting cylinder (3) are fixed with connecting structures (5), and protective structures (6) are provided on the outside of the connecting structures (5). The protective structures (6) include an upper protective cover (61) located below the connecting structure (5), and a lower protective cover (62) is provided above the upper protective cover (61). A connecting block (63) is fixed at one end of the upper protective cover (61) and the lower protective cover (62). A connecting bolt (64) passes through the interior of the connecting block (63).

2. The twin-screw extruder for preparing a compatibilizer for thermoplastic composite materials according to claim 1, characterized in that: The bottom of the tail section (1) is fixed with a discharge pipe (9), and the top of the head section (8) is fixed with a feed hopper (7).

3. The twin-screw extruder for preparing a compatibilizer for thermoplastic composite materials according to claim 1, characterized in that: The screw structure (2) includes a central shaft (21) evenly arranged inside the connecting cylinder (3), and helical blades (22) are fixed on the outer wall of the central shaft (21). The screw structure (2) also includes a gear (23) evenly rotatably connected to the outer wall of one end of the machine head (8). The screw structure (2) also includes a servo motor (24) fixed on the outer wall of the machine head (8) below the gear (23).

4. The twin-screw extruder for preparing a compatibilizer for thermoplastic composite materials according to claim 3, characterized in that: The spiral blades (22) are symmetrically distributed on both sides of the connecting cylinder (3). One end of the central shaft (21) extends into the interior of the tail (1) and is rotatably connected to the tail (1). The other end of the central shaft (21) extends into the exterior of the head (8) and is fixedly connected to one side of the gear (23). The output end of the servo motor (24) is fixedly connected to one side of the gear (23).

5. The twin-screw extruder for preparing a compatibilizer for thermoplastic composite materials according to claim 1, characterized in that: The heating assembly (4) includes a heating seat (41), a heating cavity (42) and a heating wire (43). The heating seat (41) is fixed on the inner wall of the connecting cylinder (3). The heating seat (41) is provided with a heating cavity (42) and the heating cavity (42) is provided with a heating wire (43).

6. The twin-screw extruder for preparing a compatibilizer for thermoplastic composite materials according to claim 1, characterized in that: The connecting structure (5) includes a first connecting plate (51), a second connecting plate (52), a third connecting plate (53), and bolts (54). The first connecting plate (51) is fixed to the outer wall at both ends of the connecting cylinder (3). The second connecting plate (52) is fixed to the outer wall of the head (8) near the end of the connecting cylinder (3). The third connecting plate (53) is fixed to the outer wall of the tail (1) near the end of the connecting cylinder (3). Bolts (54) pass through the interior of the first connecting plate (51).

7. The twin-screw extruder for preparing a compatibilizer for thermoplastic composite materials according to claim 6, characterized in that: The first connecting plate (51) and the second connecting plate (52) are fixedly connected by bolts (54), and the first connecting plate (51) and the third connecting plate (53) are fixedly connected by bolts (54).

8. The twin-screw extruder for preparing a compatibilizer for thermoplastic composite materials according to claim 1, characterized in that: The upper protective cover (61) and the lower protective cover (62) are hinged together at the ends away from the connecting block (63), and the side view sections of the upper protective cover (61) and the lower protective cover (62) are both semi-circular.

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