Mould pressing device and method for jute / PLA composite material for automotive upholstery

Abstract

The invention relates to the technical field of automotive upholstery processing, and discloses a jute / PLA composite material mold pressing device and method for automotive upholstery, the jute / PLA composite material mold pressing device comprises a shell, the front end of the shell is fixedly connected with a lower mold, the top of the lower mold is provided with an upper mold, and the interior of the shell is slidably connected with a base plate; the front end of the base plate is fixedly connected with a heating plate, and the top of the base plate is rotationally connected with a closing plate through a hinge. According to the jute PLA composite material mold pressing device for the automotive upholstery, automatic bearing and preheating of raw materials are achieved through the conveying mechanism, it is guaranteed that the temperature of the jute PLA composite material is stable before mold pressing, molecular activity is sufficient, preheating, conveying, flattening and fixed linkage are achieved, temperature loss and material wrinkle displacement are avoided, the defects of forming break angles and cracking are reduced from the source, and the production efficiency is improved. The preheating material does not need to be manually transferred, the procedure connection efficiency is improved, the quality of a formed part and production continuity are synchronously optimized, and large-scale machining is adapted.

Description

Technical Field

[0001] This invention relates to the field of automotive interior parts processing technology, and in particular to a jute / PLA composite material molding device and method for automotive interior parts. Background Technology

[0002] With the rapid development of the automotive industry towards environmental protection and lightweighting, jute PLA polylactic acid composite materials have become one of the preferred materials for automotive interior parts due to their advantages such as biodegradability, low cost, low specific gravity and good mechanical properties. They are widely used in the processing and production of door panels, dashboards, seat back panels and other components. Compression molding is the core process for preparing jute PLA composite materials for automotive interior parts, and its processing efficiency and molding quality directly determine the comprehensive performance and production benefits of the products.

[0003] Because jute PLA composite materials have high hardness at room temperature, direct molding can easily lead to defects such as corner deformation and insufficient fusion of internal components. Preheating is required before molding to improve the material's softness and molecular activity. However, existing equipment either lacks a preheating process or its preheating and conveying functions, resulting in independent molding processes and a lack of automated linkage. This often requires manual transfer of preheated raw materials to the molding area, which not only leads to time-consuming process connections but may also affect the subsequent molding effect due to material temperature loss and uneven stress during the transfer. On the other hand, the raw materials lack effective fixing and flattening structures during conveying and pretreatment. Jute PLA composite materials are thin and lightweight, making them prone to displacement and deviation during conveying, and their surface is prone to natural wrinkles. Existing equipment cannot simultaneously complete the flattening process during conveying, resulting in insufficient positioning accuracy and poor surface flatness when the raw materials enter the molding area. The final molded interior parts are prone to quality defects such as dimensional deviations, uneven surfaces, and corner cracks, significantly reducing the product qualification rate. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing technology has the disadvantages of lacking a pretreatment step for raw materials and having an inconsistent processing procedure. To address this, we propose a molding device and method for jute / PLA composite materials for automotive interior parts.

[0005] To achieve the above objectives, this application employs the following molding device for jute / PLA composite materials used in automotive interior parts, comprising a housing, a lower mold fixedly connected to the front end of the housing, an upper mold mounted on the top of the lower mold, a base plate slidably connected inside the housing, a heating plate fixedly connected to the front end of the base plate, a closing plate rotatably connected to the top of the base plate via a hinge, a dividing mold provided on the inner wall of the lower mold, and also including rollers and push rods;

[0006] The top of the housing is provided with a conveying mechanism, which enables the closing plate to automatically deflect downward and close to carry the raw material, preheat the raw material, and then convey the raw material to the processing area for molding.

[0007] A flattening mechanism is connected to the conveying mechanism so that the rollers roll along the surface of the raw material during the forward movement of the closing plate, smoothing out the tortuous parts of the raw material surface and ensuring that the raw material is in a relatively flat state before entering the processing area.

[0008] A fixing mechanism is connected to the conveying mechanism so that the push rod automatically moves down to clamp and fix the raw material during the forward movement of the closing plate, thereby preventing displacement during material conveying and pretreatment and ensuring the smoothness of the entire processing flow.

[0009] The demolding mechanism is connected to the conveying mechanism so that the mold can be automatically lifted after the closing plate is reset, and the molded part can be lifted out to achieve demolding.

[0010] Preferably, the conveying mechanism includes:

[0011] Two lead screws are installed on both sides of the housing. A movable plate is threaded onto the surface of the lead screw. Long grooves are formed on both sides of the housing. Limiting grooves are formed on both sides of the housing. Slide plates are fixedly connected to both sides of the base plate. The slide plates are slidably connected to the inner wall of the long grooves. Slide rods are fixedly connected to both sides of the closing plate. The slide rods are slidably connected to the inner wall of the limiting grooves and the inner wall of the movable plate. An extension plate is fixedly connected to one side of the lower mold. A hydraulic rod is fixedly connected to one side of the extension plate. A pressure plate is fixedly connected to the output end of the hydraulic rod. Sensors are installed at the bottom of the pressure plate and the top of the closing plate.

[0012] Preferably, the flattening mechanism includes:

[0013] The rack consists of two racks fixedly connected to both sides of the inner wall of the housing. Long rods are fixedly connected to both sides of the bottom of the closing plate. Slider blocks are slidably connected to the surface of the long rods. The two ends of the roller are installed between the two sliders. A toothed plate is fixedly connected to the top of the slider. Gears are rotatably connected to both sides of the top of the closing plate via a rotating shaft. The top of the toothed plate meshes with the bottom of the gear, and the bottom of the gear meshes with the top of the rack.

[0014] Preferably, the fixing mechanism includes:

[0015] The limiting plates are two in number and fixedly connected to both sides of the closed plate. The push rod is slidably connected to the surface of the limiting plates. The top of the limiting plates is fixedly connected to both sides of the top. The top of the closed plate is fixedly connected to both sides of the top. The top of the spring is fixedly connected to the push rod. The top of the housing is fixedly connected to two guide shells. The top of the push rod is slidably connected to the inner wall of the guide shell.

[0016] Preferably, the demolding mechanism includes:

[0017] A limiting shell has a carrier plate slidably connected to its inner wall. Two sliding pillars are fixedly connected to one end of the carrier plate. The top of the sliding pillars is fixedly connected to the dividing mold, and the sliding pillars are slidably connected to the inside of the lower mold. L-shaped plates are fixedly connected to both sides of the bottom of the base plate. A U-shaped rod is rotatably connected between the two L-shaped plates. The U-shaped rod is slidably connected to the inner wall of the carrier plate. Lifting grooves are opened on both sides of the inner wall of the shell. The bottom of the L-shaped plate is slidably connected to the inner wall of the lifting groove, and both sides of the U-shaped rod are slidably connected to the inner wall of the lifting groove.

[0018] Preferably, both the heating plate and the closing plate have notches on one side, and the two sides of the bottom of the pressure plate are inserted into the notches.

[0019] Preferably, the inner wall of the moving plate is obliquely opened, and the inclination direction of the interior of the moving plate is opposite to that of the inner wall of the limiting groove.

[0020] Preferably, both ends of the guide shell are designed at an angle, and the length of the bottom end of the guide shell is greater than the sliding distance of the slider.

[0021] This application also provides the following molding method: a molding method for jute PLA composite material for automotive interior parts, comprising the following steps:

[0022] S1: The staff places the jute PLA composite material on the top of the heating plate, and then the screw drives the closing plate to deflect downward to the top of the heating plate. After that, the heating plate is activated to heat the raw material on the top. The preheating treatment makes the jute PLA composite material reach the appropriate softness and avoids corner deformation during molding.

[0023] S2: The heating plate is driven forward by the screw. During the forward movement, the flattening mechanism and the fixing mechanism are linked. The fixing mechanism fixes the raw material on the surface of the heating plate. Then, the roller rolls along the surface of the raw material to smooth out the folds and wrinkles on the surface of the raw material, effectively avoiding molding defects caused by uneven raw materials.

[0024] S3: The raw material is conveyed to the top of the lower mold through the heating plate. The pressure plate moves down using the sensor to clamp one side of the raw material. The pressure plate is then gradually moved away from the lower mold by the screw. The raw material is then pulled out from between the heating plate and the closing plate and laid flat on the surface of the lower mold. Then the upper mold moves down and closes with the lower mold. The pressure of the upper mold causes the jute PLA composite material to be evenly and tightly adhered to the lower mold and the upper mold. The jute PLA composite material is compressed and deformed to form the shape of the automotive interior parts that meet the design requirements.

[0025] S4: After molding is completed, the screw reverses to drive the relevant components to reset to the initial position. When reset to the initial position, the demolding mechanism moves the mold upward to lift the finished part inside the lower mold, completing the demolding process. Afterward, the finished part is removed by the staff, and the device is reset to the initial state to prepare for the next processing.

[0026] The technical effects and advantages of this invention are as follows:

[0027] In this invention, the entire process of automatic loading, preheating, and precise delivery of raw materials to the processing area is completed through the cooperation of the conveying mechanism and various components. The preheating treatment allows the jute PLA composite material to reach a suitable softness, avoiding angular deformation during molding. At the same time, it activates the activity of material molecules and improves the integration of components, ensuring the quality of the molded parts from the source. The entire process does not require manual intervention in the connection between conveying and preheating, which greatly improves production efficiency.

[0028] In this invention, the flattening mechanism is linked with the conveying mechanism. During the raw material conveying process, the rollers automatically roll to flatten the surface tortuosity, avoiding molding defects caused by uneven materials. The fixing mechanism simultaneously clamps and fixes the raw material to prevent displacement during conveying and pre-processing, ensuring the flattening effect and subsequent molding positioning accuracy, and significantly improving the appearance integrity and dimensional accuracy of the molded parts.

[0029] In this invention, the demolding mechanism and the conveying mechanism work together to automatically lift the lower mold after the bearing component is reset, and push the molded part out of the lower mold. There is no need for manual prying or assisted demolding. This design avoids damage to the molded part caused by manual demolding, while reducing operation steps, reducing the labor intensity of workers, and improving the finished product qualification rate and production continuity.

[0030] In this invention, the conveying mechanism serves as the core transmission foundation, linking the three major mechanisms of flattening, fixing, and demolding to operate synchronously. The processes are seamlessly connected, eliminating the need for additional independent drive components. This simplifies the equipment structure, reduces coordination errors in each stage, and makes the processing flow smoother. It is adapted to the characteristics of jute PLA composite materials, taking into account all the needs of material pretreatment, molding, and demolding, thus broadening the applicable scenarios of the equipment. Attached Figure Description

[0031] Figure 1This is a schematic diagram of the main structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the shell structure of the present invention;

[0033] Figure 3 This is a schematic diagram of a portion of the conveying mechanism of the present invention;

[0034] Figure 4 This is a schematic diagram of a portion of the conveying mechanism of the present invention;

[0035] Figure 5 This is a schematic diagram of the moving mechanism of the present invention;

[0036] Figure 6 This is a partial structural cross-sectional view of the flattening mechanism of the present invention;

[0037] Figure 7 This is a schematic diagram of the guide shell structure of the present invention;

[0038] Figure 8 This is an exploded view of part of the demolding mechanism of the present invention;

[0039] Figure 9 This is a flowchart of the molding method of the present invention.

[0040] Legend: 1. Housing; 2. Lower mold; 3. Upper mold; 4. Base plate; 5. Heating plate; 6. Closing plate; 7. Separating mold; 8. Roller; 9. Push rod; 10. Lead screw; 11. Moving plate; 12. Long groove; 13. Limiting groove; 14. Slide plate; 15. Slide rod; 16. Extension plate; 17. Hydraulic rod; 18. Pressure plate; 19. Sensor; 20. Rack; 21. Long rod; 22. Slider; 23. Toothed plate; 24. Gear; 25. Limiting plate; 26. Protruding rod; 27. Spring; 28. Guide shell; 29. ​​Limiting shell; 30. Carrier plate; 31. Slide column; 32. L-shaped plate; 33. U-shaped rod; 34. Lifting groove. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the invention in a schematic manner, and therefore only show the components relevant to the invention.

[0042] Reference Figure 1 - Figure 9As shown, the present invention provides a jute / PLA composite material molding device for automotive interior parts, including a housing 1, a lower mold 2 fixedly connected to the front end of the housing 1, an upper mold 3 installed on the top of the lower mold 2, a base plate 4 slidably connected inside the housing 1, a heating plate 5 fixedly connected to the front end of the base plate 4, a closing plate 6 rotatably connected to the top of the base plate 4 via a hinge, a dividing mold 7 provided on the inner wall of the lower mold 2, and also includes a roller 8 and a push rod 9.

[0043] The top of the housing 1 is provided with a conveying mechanism, a flattening mechanism is driven to the conveying mechanism, a fixing mechanism is driven to the conveying mechanism, and a demolding mechanism is driven to the conveying mechanism.

[0044] Reference Figure 1 - Figure 8 As shown, in this embodiment, the conveying mechanism includes:

[0045] Two lead screws 10 are installed on both sides of the housing 1. A movable plate 11 is threaded onto the surface of each lead screw 10. Long slots 12 and limiting slots 13 are provided on both sides of the housing 1. Slide plates 14 are fixedly connected to both sides of the base plate 4, and the slide plates 14 are slidably connected to the inner walls of the long slots 12. Slide rods 15 are fixedly connected to both sides of the closing plate 6, and the slide rods 15 are slidably connected to the inner walls of the limiting slots 13 and the inner walls of the movable plate 11. An extension plate 16 is fixedly connected to one side of the lower mold 2, and a hydraulic rod 17 is fixedly connected to one side of the extension plate 16. A pressure plate 18 is fixedly connected to the output end of the hydraulic rod 17. Sensors 19 are installed at the bottom of the pressure plate 18 and the top of the closing plate 6. A heating plate 5 and... The closing plate 6 has a notch on one side, and the bottom sides of the pressure plate 18 are inserted into the notch. The user places the jute PLA composite material to be processed on the top area of ​​the heating plate 5, and then starts the screw 10 to run, so that the moving plate 11 moves forward in a straight line along the surface of the screw 10. The forward movement of the moving plate 11 drives the slide rod 15 to slide along the limiting groove 13. When the slide rod 15 gradually descends along the limiting groove 13, it will drive the closing plate 6 to gradually deflect downward, so that the closing plate 6 rotates to a state parallel to the heating plate 5. Then the screw 10 stops running, and the heating element inside the heating plate 5 is energized, so that the top area of ​​the heating plate 5 heats up. The temperature rise between the heating plate 5 and the closing plate 6 is conducted to the processing material to preheat the processing material.

[0046] After the material is preheated for a period of time and reaches the predetermined temperature before molding, the lead screw 10 will run again, driving the slide bar 15 to slide forward along the limiting groove 13. This causes the closing plate 6, heating plate 5, and base plate 4 to move forward synchronously. During this process, the slide plate 14 will also slide straight along the long groove 12. When the closing plate 6 and heating plate 5 move to the other end through the sliding of the moving plate 11, the heating plate 5 and closing plate 6 will be placed at the bottom of the upper mold 3. At this time, the notches on both sides of the front end of the closing plate 6 will be inserted into the two ends of the pressure plate 18. At the same time, the sensor 19 on the top of the closing plate 6 and the sensor 19 on the bottom of the pressure plate 18 are aligned. The signal transmitted between the two sensors 19 controls the hydraulic rod 17 to descend, which causes the pressure plate 18 to move down and approach the extension plate 16. The raw material is placed between the heating plate 5 and the closing plate 6. After one end moves to the bottom of the upper mold 3, the raw material is inserted between the pressure plate 18 and the extension plate 16. The pressure plate 18 descends and forms a clamping and fixing of the raw material with the extension plate 16.

[0047] Then, the lead screw 10 reverses and drives the moving plate 11 to move in the opposite direction to reset. When the heating plate 5 and the closing plate 6 move backward, the raw material inside will be clamped by the pressure plate 18 and the extension plate 16 and will no longer move with the heating plate 5. At this time, the raw material is in a soft state and, as the heating plate 5 moves backward, it is laid flat on the top of the lower mold 2. This causes the two sensors 19 to move away from each other. The sensors 19 transmit signals to the control terminal. After the two sensors 19 move away, the preset program delays and starts the upper mold 3 to descend and close the mold for molding. During this process, the closing plate 6 and the heating plate 5 have completely moved out from the bottom of the upper mold 3. In addition, the hydraulic rod 17 will also rise to release the pressure plate 18 and the extension plate 16 from clamping the raw material. At this time, the raw material is laid flat on the surface of the lower mold 2. The upper mold 3 descends to mold the preheated raw material. After the molding is completed, the operator takes out the molded part inside the lower mold 2 and completes one processing. During the mold closing process of the lower mold 2 and the upper mold 3, the heating plate 5 and the closing plate 6 will continue to move backward to reset to the initial position through the lead screw 10 to prepare for the next processing.

[0048] By preheating the raw materials before molding, the material is prevented from being damaged by bending and deformation due to its hardness under constant temperature and pressure from the upper mold 3. Preheating allows the raw materials to reach a suitable softness, enabling them to better conform to the mold shape when the upper mold 3 closes for molding, ensuring the quality and appearance integrity of the molded parts. Furthermore, preheating makes the molecular structure of the raw materials more active, which is conducive to better integration of the components during molding, improving the overall performance of jute PLA composite materials for automotive interior parts. At the same time, preheating also reduces the internal stress caused by excessive material hardness during molding, reducing the probability of cracking and other problems during use, and extending the service life of the product.

[0049] Reference Figure 3, Figure 4 and Figure 6 As shown in this implementation plan, the flattening mechanism includes:

[0050] Two racks 20 are fixedly connected to both sides of the inner wall of the housing 1. Long rods 21 are fixedly connected to both sides of the bottom of the closing plate 6. Slider 22 is slidably connected to the surface of the long rods 21. The two ends of the roller 8 are installed between the two sliders 22. A toothed plate 23 is fixedly connected to the top of the slider 22. Gears 24 are rotatably connected to both sides of the top of the closing plate 6 through a rotating shaft. The top of the toothed plate 23 is meshed with the bottom of the gear 24. The bottom of the gear 24 is meshed with the top of the rack 20. When the heating plate 5 and the closing plate 6 are parallel and move forward, the gear 24 will follow the closing plate 6 and mesh with the rear end of the rack 20. As the closing plate 6 moves backward, the rack 20 pushes the gear 24 to rotate counterclockwise. The rotation of the gear 24 drives the toothed plate 23 to move backward, so that the toothed plate 23 drives the slider 22 to slide along the surface of the long rod 21. The roller 8 slides with the slider 22 and will roll along the top of the raw material to one side. The movement of the roller 8 rolls and smooths the preheated raw material.

[0051] The design of this smoothing mechanism, which ensures that the raw materials are in a relatively flat state before processing, is ingenious. While ensuring the flatness of the raw materials, it will not cause additional damage or deformation to the preheated raw materials, effectively avoiding molding defects caused by uneven raw materials. This further improves the quality of molding of jute PLA composite materials for automotive interior parts, so that the final automotive interior parts produced can meet higher standards in terms of appearance and performance, satisfying the market's demand for high-quality automotive interior parts. Moreover, the entire smoothing process is completed automatically as the device moves forward and backward, without the need for additional manual intervention, which greatly improves production efficiency and reduces production costs.

[0052] It should be noted that when the closing plate 6 is rotated to the vertical position and the toothed plate 23 is in a vertically downward position, its bottom will be restricted by the base plate 4 and cannot move down. As a result, in the initial state of the closing plate 6, the toothed plate 23 is reset to the top. In addition, the smoothing process occurs before the closing plate 6 moves to the bottom area of ​​the upper mold 3. After the smoothing is completed and the gear 24 is separated from the rack 20, the heating plate 5 and the closing plate 6 still need to move forward a certain distance before one side of the closing plate 6 can be placed in the bottom area of ​​the upper mold 3.

[0053] Reference Figure 6 and Figure 7 As shown in this embodiment, the fixing mechanism includes:

[0054] Two limiting plates 25 are fixedly connected to both sides of the closing plate 6. A push rod 9 is slidably connected to the surface of the limiting plate 25. Protruding rods 26 are fixedly connected to both sides of the top of the limiting plate 25. Springs 27 are fixedly connected to both sides of the top of the closing plate 6, with the top of the springs 27 fixedly connected to the push rod 9. Two guide shells 28 are fixedly connected to the top of the housing 1. The top of the push rod 9 is slidably connected to the inner wall of the guide shell 28. Both ends of the guide shell 28 are angled, and the length of the bottom end of the guide shell 28 is greater than the sliding distance of the slider 22. Before the gear 24 meshes with the rack 20, the forward movement of the heating plate 5 and the closing plate 6 will cause the push rod 9 to move to the bottom of the guide shell 28. As the closing plate 6 moves forward, the protruding rods 26 contact the angled surfaces of the guide shell 28. When the guide shell 28 is touched, the inclined surface of the guide shell 28 guides the protruding rod 26 downward and presses the spring 27 to store force, so that the push rod 9 slides down along the limiting plate 25 to clamp the raw material on the top of the heating plate 5. The raw material is fixed to the top of the heating plate 5 by the pressure of the push rod 9, so as to ensure that the roller 8 will not shift when rolling and smoothing the surface of the raw material. After the smoothing movement of the roller 8 is completed, the protruding rod 26 will slide to the other side of the guide shell 28. Using the inclined surface of the protruding rod 26 and the other side of the guide shell 28, the spring 27 is no longer guided by the guide shell 28, causing the spring 27 to rebound and drive the push rod 9 to rise to release the clamping and fixing of the raw material. After that, the raw material is placed at the bottom of the upper mold 3 and can be removed from between the heating plate 5 and the closing plate 6 by the clamping of the pressure plate 18.

[0055] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 8 As shown in this implementation scheme: the demolding mechanism includes:

[0056] A limiting shell 29 has a carrier plate 30 slidably connected to its inner wall. Two sliding pillars 31 are fixedly connected to one end of the carrier plate 30. The top of the sliding pillars 31 is fixedly connected to the dividing mold 7, and the sliding pillars 31 are slidably connected to the inside of the lower mold 2. L-shaped plates 32 are fixedly connected to both sides of the bottom of the base plate 4. A U-shaped rod 33 is rotatably connected between the two L-shaped plates 32. The U-shaped rod 33 is slidably connected to the inner wall of the carrier plate 30. Lifting grooves 34 are provided on both sides of the inner wall of the shell 1. The bottom of the L-shaped plate 32 is slidably connected to the inner wall of the lifting groove 34, and both sides of the U-shaped rod 33 are slidably connected to the inner wall of the lifting groove 34. In the initial state, the L-shaped plate 32 and the U-shaped rod 33 are both in the inclined groove of the lifting groove 34. At this time, the U-shaped rod 33 is in an inclined state, which will lift the carrier plate 30 upward along the limiting shell. The upward sliding of 29 causes the carrier plate 30 to drive the sliding column 31 to slide upward along the inside of the lower mold 2, pushing the sub-mold 7 to move upward. This causes the sub-mold 7 to be lifted out of the surface of the lower mold 2. When the heating plate 5 and the closing plate 6 move forward, the L-shaped plate 32 and the U-shaped rod 33 slide into the straight groove of the lifting groove 34. The height of the U-shaped rod 33 will decrease and be in a horizontal state, so that the height of the carrier plate 30 will decrease, and the height of the sub-mold 7 will be lowered into the lower mold 2. At this time, the lower mold 2 and the sub-mold 7 are fully connected. After the raw material is molded through the upper mold 3 and the lower mold 2, the lifting of the sub-mold 7 will push the raw material formed inside the lower mold 2 upward, causing the raw material to detach from the lower mold 2 and complete the demolding process, so that the workers can take out the molded finished part.

[0057] Reference Figure 2 As shown in this embodiment: the inner wall of the moving plate 11 is opened at an angle, and the inclination direction of the inner wall of the moving plate 11 is opposite to that of the inner wall of the limiting groove 13. By utilizing the opposite opening of the moving plate 11 and the limiting groove 13, when the moving plate 11 initially moves backward, the moving plate 11 can guide the slide rod 15 downward to slide along the inclined groove of the limiting groove 13, ensuring that the slide rod 15 can slide along the limiting groove 13 into the straight groove. When moving in the opposite direction, the moving plate 11 can guide the slide rod 15 upward to slide along the limiting groove 13 to the highest point, so as to complete the deflection of the closing plate 6 in the forward and reverse directions.

[0058] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 molding device for jute / PLA composite material for automotive interior parts, comprising a housing (1), characterized in that: The front end of the housing (1) is fixedly connected to a lower mold (2), the top of the lower mold (2) is equipped with an upper mold (3), the interior of the housing (1) is slidably connected to a base plate (4), the front end of the base plate (4) is fixedly connected to a heating plate (5), the top of the base plate (4) is rotatably connected to a closing plate (6) via a hinge, the inner wall of the lower mold (2) is provided with a dividing mold (7), and also includes a roller (8) and a push rod (9); The top of the housing (1) is provided with a conveying mechanism, which enables the closing plate (6) to automatically deflect downward to close and carry the raw material, preheat the raw material, and then convey the raw material to the processing area for molding. A flattening mechanism is connected to the conveying mechanism so that the roller (8) rolls along the surface of the raw material during the forward movement of the closed plate (6) to flatten the tortuous surface of the raw material. A fixing mechanism is connected to the conveying mechanism so that the push rod (9) automatically moves down to clamp and fix the raw material during the forward movement of the closing plate (6); The demolding mechanism is connected to the conveying mechanism so that after the closing plate (6) is reset, the mold (7) is automatically lifted to lift the molded part out and achieve demolding.

2. The molding device for jute / PLA composite materials for automotive interior parts according to claim 1, characterized in that: The conveying mechanism includes: Two lead screws (10) are installed on both sides of the housing (1). The surface of the lead screw (10) is threaded with a moving plate (11). Long grooves (12) are opened on both sides of the housing (1). Limiting grooves (13) are opened on both sides of the housing (1). Slide plates (14) are fixedly connected to both sides of the base plate (4). The slide plates (14) are slidably connected to the inner wall of the long grooves (12). Both sides of the closing plate (6) are fixedly connected to... There is a slide rod (15), which is slidably connected to the inner wall of the limiting groove (13) and the inner wall of the moving plate (11). An extension plate (16) is fixedly connected to one side of the lower mold (2), and a hydraulic rod (17) is fixedly connected to one side of the extension plate (16). A pressure plate (18) is fixedly connected to the output end of the hydraulic rod (17). Sensors (19) are installed at the bottom of the pressure plate (18) and the top of the closing plate (6).

3. The molding device for jute / PLA composite materials for automotive interior parts according to claim 2, characterized in that: The flattening mechanism includes: Two racks (20) are fixedly connected to the two sides of the inner wall of the housing (1). Long rods (21) are fixedly connected to both sides of the bottom of the closing plate (6). Slider (22) is slidably connected to the surface of the long rods (21). The two ends of the roller (8) are installed between the two sliders (22). A toothed plate (23) is fixedly connected to the top of the slider (22). Gears (24) are rotatably connected to both sides of the top of the closing plate (6) through a rotating shaft. The top of the toothed plate (23) is meshed with the bottom of the gear (24). The bottom of the gear (24) is meshed with the top of the rack (20).

4. The molding device for jute / PLA composite materials for automotive interior parts according to claim 3, characterized in that: The fixing mechanism includes: Limiting plates (25), there are two limiting plates (25) and they are fixedly connected to both sides of the closing plate (6). The push rod (9) is slidably connected to the surface of the limiting plate (25). The top of the limiting plate (25) is fixedly connected to both sides of the top. The top of the closing plate (6) is fixedly connected to both sides of the top. The top of the spring (27) is fixedly connected to the push rod (9). The top of the housing (1) is fixedly connected to two guide shells (28). The top of the push rod (9) is slidably connected to the inner wall of the guide shell (28).

5. The molding device for jute / PLA composite materials for automotive interior parts according to claim 4, characterized in that: The demolding mechanism includes: A limiting shell (29) has a carrier plate (30) slidably connected to its inner wall. Two sliding columns (31) are fixedly connected to one end of the carrier plate (30). The top of the sliding column (31) is fixedly connected to the dividing mold (7). The sliding column (31) is slidably connected to the inside of the lower mold (2). L-shaped plates (32) are fixedly connected to both sides of the bottom of the base plate (4). A U-shaped rod (33) is rotatably connected between the two L-shaped plates (32). The U-shaped rod (33) is slidably connected to the inner wall of the carrier plate (30). Lifting grooves (34) are opened on both sides of the inner wall of the shell (1). The bottom of the L-shaped plate (32) is slidably connected to the inner wall of the lifting groove (34). Both sides of the U-shaped rod (33) are slidably connected to the inner wall of the lifting groove (34).

6. The molding device for jute / PLA composite material for automotive interior parts according to claim 2, characterized in that: The heating plate (5) and the closing plate (6) each have a notch on one side, and the two sides of the bottom of the pressure plate (18) are inserted into the notch.

7. The molding device for jute / PLA composite materials for automotive interior parts according to claim 2, characterized in that: The inner wall of the moving plate (11) is obliquely opened, and the inclination direction of the interior of the moving plate (11) is opposite to that of the inner wall of the limiting groove (13).

8. A molding device for jute / PLA composite materials for automotive interior parts according to claim 4, characterized in that: Both ends of the guide shell (28) are designed to be angled, and the length of the bottom end of the guide shell (28) is greater than the sliding distance of the slider (22).

9. A molding method using the jute / PLA composite material molding apparatus for automotive interior parts as described in claim 5, characterized in that: Includes the following steps: S1: Feeding stage: The staff places the jute PLA composite material on the top of the heating plate (5), and then drives the closing plate (6) to deflect downward to the top of the heating plate (5) through the operation of the screw (10). After that, the heating plate (5) starts to heat the raw material on the top. The preheating treatment makes the jute PLA composite material reach the appropriate softness. S2: Pre-treatment stage: The heating plate (5) is driven forward by the screw (10). During the forward movement, the flattening mechanism and the fixing mechanism are linked. The fixing mechanism is used to fix the raw material on the surface of the heating plate (5). Then, the roller (8) rolls along the surface of the raw material to smooth out the folds and wrinkles on the surface of the raw material. S3: Molding preparation: The raw material is conveyed to the top of the lower mold (2) through the heating plate (5). The pressure plate (18) is moved down by the sensor (19) to clamp one side of the raw material. The screw (10) is reset and gradually moves away from the lower mold (2) so that the raw material is pulled out from between the heating plate (5) and the closing plate (6) and laid flat on the surface of the lower mold (2). Then the upper mold (3) moves down and closes with the lower mold (2). The pressure of the upper mold (3) makes the jute PLA composite material fit evenly and tightly in the lower mold (2) and the upper mold (3), so that the jute PLA composite material is squeezed and deformed to form the shape of automotive interior parts. S4: Demolding process: After molding is completed, the screw (10) reverses to drive the relevant components to reset to the initial position. When reset to the initial position, the demolding mechanism is linked to cause the sub-mold (7) to move up, lift out the finished part inside the lower mold (2), and complete the demolding process. Afterwards, the finished part is taken out by the staff.

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