Hollow plate production line formed by extruding powder through one-step method and hollow plate production method

Abstract

The invention relates to a production line for extrusion molding of a hollow plate by using a powder one-step method and a production method of the hollow plate, and relates to the technical field of hollow plate production, the production line for extrusion molding of the hollow plate by using the powder one-step method comprises a feeding mechanism used for uniformly conveying quantitative powder and plastic granules; the extruder is arranged below the feeding mechanism and is used for directly extruding the powder conveyed by the feeding mechanism and the plastic granules into molten materials; the molding mechanism comprises a molding mold and a shaping table which are sequentially arranged in the horizontal direction, the molding mold is used for molding the extruded molten material into a hollow plate, the shaping table is used for cooling and shaping the molded hollow plate, powder and plastic granules are directly input into an extruder, an intermediate granulation process is not needed, energy consumption can be greatly reduced, and the production efficiency is improved. And the production cycle can be greatly shortened, the occupied area of equipment is reduced, and the production efficiency of the hollow plate can be remarkably improved.

Description

Technical Field

[0001] This application relates to the field of hollow board production technology, and in particular to a hollow board production line and method using a one-step extrusion molding process for powder. Background Technology

[0002] Hollow core board, also known as plastic hollow core board or corrugated board, is a lightweight, high-strength, corrosion-resistant, and recyclable green and environmentally friendly board material, widely used in packaging, advertising, construction and other fields. With the deepening of the concept of resource recycling, the production of hollow core board by blending powders (such as calcium powder, stone powder, etc.) with plastic granules has become an important direction for realizing solid waste resource utilization and reducing production costs.

[0003] Currently, traditional hollow board extrusion molding production methods typically employ a step-by-step process when mixing and extruding powder and plastic granules. Specifically, the powder and plastic granules are first initially mixed using a low-speed mixer, then processed into uniform granular mixtures using a granulator, and finally fed into an extruder for melt extrusion molding. However, the granulation process itself is an independent energy-consuming step, and the subsequent extruder needs to reheat the cooled granules to a molten state, resulting in repeated energy consumption and high overall energy consumption. Furthermore, the granulation step prolongs the production process, increases equipment investment and floor space requirements, and reduces production efficiency. Summary of the Invention

[0004] In order to solve the problems of long production process, high heating energy consumption and low production efficiency caused by the need for granulation in the existing hollow board production process using powder, this application provides a hollow board production line using a one-step extrusion molding process using powder.

[0005] Firstly, the hollow board production line using one-step extrusion molding of powder provided in this application adopts the following technical solution: A production line for one-step extrusion molding of hollow boards using powder, the production line comprising: The feeding mechanism is used to uniformly convey a fixed amount of powder and plastic granules; An extruder, located below the feeding mechanism, is used to directly extrude the powder and plastic granules conveyed by the feeding mechanism into molten material; The molding mechanism includes a molding die and a shaping table arranged sequentially along the horizontal direction. The molding die is used to shape the extruded molten material into a hollow plate, and the shaping table is used to cool and shape the shaped hollow plate.

[0006] By adopting the above technical solution and using a one-step production method, in which powder and plastic granules are directly fed into the extruder without the need for an intermediate granulation process, energy consumption can be greatly reduced, the production cycle can be significantly shortened, the equipment footprint can be reduced, and the production efficiency of hollow boards can be significantly improved. This solves the problems of long production process, high heating energy consumption, and low production efficiency caused by the need for granulation in the existing production of hollow boards using powder.

[0007] Optionally, the extruder includes: chassis; Two rotors are rotatably mounted inside the housing, each rotor including a first rotating segment extending axially, the first rotating segment being offset. Wherein, when the two rotors rotate, the distance between the two first rotating segments can change periodically.

[0008] By adopting the above technical solution and setting a first rotating section, a volumetric pulsating deformation melting and plasticizing transport method based on tensile rheology can be formed when the rotor rotates. This makes the force on the material mainly tensile force, thus transforming the traditional shearing transport method into a volumetric pulsating transport method based on tensile rheology. This not only makes energy transfer more uniform and ensures consistent force on the inside and surface of the material, avoiding local overheating, but also breaks up material agglomeration through periodic extrusion and relaxation, enhancing the mixing effect. This allows the high-temperature mixture to flow uniformly in the extrusion chamber, enabling the extruder to directly extrude powder and plastic granules into molten material.

[0009] Optionally, the housing includes a first exhaust port and a second exhaust port that communicate with the extrusion chamber. The first exhaust port and the second exhaust port are arranged sequentially along the material flow direction. The first exhaust port is used to communicate with external air, and the second exhaust port is connected to a vacuum device to vacuum adsorb water vapor in the extrusion chamber.

[0010] By adopting the above technical solution, by setting a first exhaust port to squeeze the gas to the outside when the mixture is compressed, the mixture can be stably and continuously conveyed in the extrusion chamber. By setting a second exhaust port to absorb the water vapor trapped in the molten material, the molten material entering the molding die is ensured to be dense, uniform and free of water vapor, thereby helping to improve the molding quality of the hollow board.

[0011] The feeding mechanism includes: A mixing device, located above the extruder, is used to feed uniformly mixed powder and plastic granules into the extruder; and, A feeding device is located above the mixing device to feed a fixed amount of powder and plastic granules to the mixing device.

[0012] By adopting the above technical solution, by setting up a feeding device, the conveying amount of powder and plastic granules can be precisely controlled to avoid affecting the performance of the hollow board due to material fluctuations. By setting up a mixing device, the powder can be evenly coated on the surface of the plastic granules or dispersed in the matrix, thereby ensuring that the powder and plastic granules input into the extruder are mixed evenly.

[0013] Optionally, the mixing device includes: A mixer, located above the extruder, is used to feed uniformly mixed powder and plastic granules into the extruder; and, A metering component is located above the mixer to feed a fixed amount of powder and plastic granules into the mixer.

[0014] By adopting the above technical solution and setting up metering components, the conveying volume of the mixed materials can be accurately controlled to prevent differences in board performance caused by material fluctuations. By setting up a mixer, it can be ensured that the powder can be evenly coated on the surface of the plastic granules or dispersed in the matrix, reducing surface pitting or mechanical property degradation caused by powder agglomeration, thereby helping to improve the quality of hollow boards.

[0015] Optionally, the metering component includes: A metering chamber, located above the mixer, is used to receive powder and plastic granules; A weighing sensor, disposed in the measuring chamber, is used to detect the weight of the measuring chamber; and, A metering valve is located in the metering chamber and is used to adjust the size of the metering chamber's outlet.

[0016] By adopting the above technical solution, a metering chamber is set up to buffer and stabilize the feeding, reducing the fluctuations in mixing effect, extrusion pressure and temperature caused by feeding fluctuations. By setting up a weighing sensor and an adjustable metering valve to form a closed-loop system, the output quantity can be measured and precisely adjusted in real time, thereby ensuring that the amount of material input into the mixer meets the process requirements.

[0017] Optionally, the feeding device includes two feeding structures, each of which includes a feeding bin and a screw conveyor. The feeding bin is located above the mixing device and is used to collect powder or plastic granules. The screw conveyor is located between the feeding bin and the mixing device and is used to quantitatively transport powder or plastic granules.

[0018] By adopting the above technical solution, and by setting up two feeding structures, the two feeding bins can collect powder and plastic granules respectively. By controlling the rotation speed of the screw shaft of the screw conveyor, one screw conveyor can transport powder and the other can transport plastic granules according to process requirements. The two are kept independent before entering the mixing device, and then merged in proportion after entering, which helps to accurately control the conveying amount of powder and plastic granules.

[0019] Optionally, the production line for one-step extrusion molding of hollow boards using powder includes a first traction machine, a baking oven, an air cooler, a second traction machine, a cutting machine, and a stacking machine arranged sequentially in a horizontal direction. The first traction machine is used to transfer the hollow boards from the shaping table to the baking oven, where the baking oven is used to reheat the hollow boards. The air cooler is used to cool the reheated hollow boards. The second traction machine is used to transfer the air-cooled hollow boards to the cutting machine, where the cutting machine is used to cut the hollow boards. The stacking machine is used to transfer the cut hollow boards to a storage area for stacking.

[0020] By adopting the above technical solutions and setting up ovens and air coolers to heat-treat hollow boards, the quality and performance stability of hollow boards can be improved. Furthermore, by using automated traction machines, cutting machines, and palletizing machines, the scattered and independent subsequent processing processes can be integrated into a continuous line, which can greatly reduce material transfer and manual intervention in intermediate links, thereby realizing integrated and automated production from raw materials to finished products.

[0021] Secondly, the hollow board production method provided in this application adopts the following technical solution: A method for producing hollow boards, based on a one-step extrusion molding production line for powder, the production line including a feeding mechanism for uniformly conveying a fixed amount of powder and plastic granules, an extruder located below the feeding mechanism for directly extruding the powder and plastic granules conveyed by the feeding mechanism into molten material, and a molding mechanism including a molding die and a setting table arranged sequentially along a horizontal direction, the molding die for shaping the extruded molten material into a hollow board, and the setting table for cooling and setting the shaped hollow board. The method for producing hollow boards includes: Feeding: The feeding mechanism evenly conveys a fixed amount of powder and plastic granules to the extruder; Extrusion: An extruder directly extrudes the input powder and plastic granules into a molten material; Molding: The molding die shapes the extruded molten material into a hollow plate, and the shaping table cools and shapes the shaped hollow plate into a hollow plate.

[0022] By adopting the above technical solution, the intermediate step of granulation is eliminated through the seamless connection between the feeding step and the extrusion step, allowing the powder and plastic granules to directly enter the extruder. The extrusion step further extrudes the powder and plastic granules directly into molten material, and the final shaping and solidification of the product are completed through the molding and shaping steps. This can reduce energy consumption and production costs, and shorten the production cycle.

[0023] Optionally, the material conveyed by the feeding mechanism includes the following mass percentages: powder: 30%-70%, plastic granules: 25%-68%, and small materials: 2%-5%.

[0024] By adopting the above technical solution and this ratio, the powder and plastic granules can be directly fed into the extruder for extrusion, and the performance of the final hollow board can be guaranteed to meet the standards.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. This application achieves one-step production by directly feeding powder and plastic granules into the extruder through a vertical and compact layout in which the extruder is set below the feeding device, eliminating the traditional granulation process, thereby greatly reducing the energy consumption and production cost of the entire production process. 2. By setting a mixer with a specific speed range and a metering component equipped with weighing feedback, it is ensured that the powder and plastic granules can be fully and uniformly mixed in a precise ratio, effectively preventing powder agglomeration or uneven dispersion, and providing a mixture with stable composition and suitable temperature for extrusion, thereby significantly improving the mechanical property consistency and surface quality of the final hollow board. 3. By integrating a series of subsequent processes such as vacuum conveying, automated traction, reheating, precision cutting and palletizing, continuous and automated production is achieved from raw material conveying, mixing and extrusion to finished product processing. This significantly reduces manual intervention and material turnover, and while improving product performance stability, it further enhances overall production efficiency and intelligence. Attached Figure Description

[0026] Figure 1 This application provides a three-dimensional structural schematic diagram of a production line for one-step extrusion molding of hollow boards using powder. Figure 2 yes Figure 1 A side enlarged schematic diagram of a production line for one-step extrusion molding of hollow boards using powder materials; Figure 3 yes Figure 1 A side view of the extruder in the diagram; Figure 4 yes Figure 1 A partial structural diagram of the rotor of the extruder in the image; Figure 5This is a flowchart illustrating the hollow board production method provided in this application.

[0027] Explanation of reference numerals in the attached figures: 100. Hollow Board Production Line Using One-Step Extrusion Molding of Powder; 1. Feeding Device; 11. Feeding Structure; 111. Feeding Hopper; 112. Screw Conveyor; 12. Vacuum Conveyor; 2. Mixing Device; 21. Metering Component; 211. Metering Bin; 22. Mixer; 3. Extruder; 31. Casing; 311. First Exhaust Port; 312. Second Exhaust Port; 313. Feed Inlet; 32. Rotor; 321. First Rotating Section; 322. Second Rotating Section; 3221. Rotating Body; 3222. Thread; 4. Molding Mechanism; 41. Molding Mold; 42. Sterilizing Table; 51. First Traction Machine; 52. Baking Oven; 53. Air Cooler; 54. Second Traction Machine; 55. Cutting Machine; 56. Palletizer; 6. Raw Material Hopper. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This application will be described in further detail below.

[0029] In one embodiment of this application, please refer to Figure 1 and Figure 2 The production line 100 for one-step extrusion molding of hollow boards using powder includes a feeding mechanism, an extruder 3, and a molding mechanism 4. The feeding mechanism is used to uniformly convey a quantitative amount of powder and plastic granules. The extruder 3 is located below the feeding mechanism and is used to directly extrude the powder and plastic granules conveyed by the feeding mechanism into molten material. The molding mechanism 4 includes a molding die 41 and a shaping table 42 arranged sequentially along the horizontal direction. The molding die 41 is used to shape the extruded molten material into a hollow board, and the shaping table 42 is used to cool and shape the shaped hollow board.

[0030] Understandably, the feeding mechanism, as the starting point of raw material transportation, is responsible for uniformly conveying a fixed amount of powder and plastic granules, providing a precise raw material basis for subsequent mixing processes. The extruder 3 is connected below the feeding mechanism, and its function is to receive the powder and plastic granules conveyed by the feeding mechanism and directly extrude them into molten material, providing a malleable material form for subsequent molding. The molding mechanism 4 includes a molding die 41 and a shaping table 42 arranged in sequence along the horizontal direction. The molding die 41 and the extruder 3 are distributed in the horizontal direction to initially shape the molten material into a hollow plate. The shaping table 42 cools the initially shaped hollow plate to fix its shape.

[0031] The feeding mechanism uniformly delivers a fixed amount of powder and plastic granules according to a preset ratio to avoid the imbalance of raw material ratio affecting product quality. The extruder 3 directly receives the powder and plastic granules delivered by the feeding mechanism and directly and quickly extrudes them into molten material. Then the molten material enters the molding die 41 to form the initial shape of the hollow plate under the constraint of the die cavity. The sizing table 42 then reduces the temperature of the hollow plate through a cooling medium (such as cooling water or cooling air) to stabilize its molecular structure and finally form the finished hollow plate.

[0032] In the technical solution of this application, a one-step production method is adopted, that is, the feeding mechanism directly feeds the powder and plastic granules into the extruder 3 without the need for an intermediate granulation process. This can greatly reduce energy consumption, significantly shorten the production cycle, reduce the equipment footprint, and significantly improve the production efficiency of hollow boards. This solves the problems of long production process, high heating energy consumption and low production efficiency caused by the need for granulation in the existing production of hollow boards using powder.

[0033] Furthermore, traditional co-rotating twin-screw extruders 3 typically rely on shear rheology-driven transport methods, which suffer from bottlenecks such as high energy consumption, large temperature rise, and uneven dispersion when extruding mixtures of powder and plastic granules. Therefore, in one embodiment of this application, the extruder 3 includes a housing 31 and two rotors 32 rotatably mounted within the housing 31. Each rotor 32 includes a first rotating end extending axially, and the first rotating segment 321 is offset, allowing the distance between the two first rotating segments 321 to be periodically adjusted as the two rotors 32 rotate. Specifically, when the eccentric rotor 32 rotates to a certain position, the distance between the two first rotating segments 321 decreases, exerting a squeezing effect on the material within the extrusion chamber; when the rotor 32 rotates to another position, the distance between the two first rotating segments 321 increases, creating a localized negative pressure that drives material flow. This periodic change in distance causes the material to be periodically stretched, compressed, and re-stretched. Thus, by adopting an offset first rotating section 321, a volumetric pulsating deformation melting and plasticizing transport mode based on tensile rheology can be formed when the rotor 32 rotates. This makes the force on the material mainly tensile force, transforming the traditional shearing transport mode into a volumetric pulsating transport mode based on tensile rheology. This not only makes energy transfer more uniform and ensures consistent force on the inside and surface of the material, avoiding local overheating, but also breaks up material agglomeration through periodic extrusion and relaxation, enhancing the mixing effect. This allows the high-temperature mixture to flow uniformly in the extrusion chamber, enabling the extruder 3 to directly extrude the high-temperature mixture discharged from the mixing device 2.

[0034] Furthermore, the first rotating segment 321 can be offset in various ways. In one embodiment, along the axial direction of the rotor 32, the first rotating segment 321 is bent back and forth along the radial direction of the rotor 32, that is, the first rotating segment 321 is approximately S-shaped. Thus, through the shape design of the first rotating segment 321, the distance between the two first rotating segments 321 can change periodically when the rotor 32 rotates, thereby allowing the material to be periodically stretched and compressed. In another embodiment, the first rotating segment 321 is eccentrically positioned, that is, the center of the first rotating segment 321 is not coaxial with its rotation center. Thus, the first rotating segment 321 is eccentrically positioned so that the distance between the two first rotating segments 321 can change periodically when the rotor 32 rotates.

[0035] It is understood that the entire rotor 32 can be offset, or only a portion of the rotor 32 can be offset. In one embodiment of this application, the casing is provided with a feed inlet, and each rotor 32 further includes a second rotating section 322. The second rotating section 322 is positioned corresponding to the feed inlet, and the distance between the two second rotating sections 322 is the same when the rotor 32 rotates. The second rotating section 322 is connected to the first rotating section 321 and is arranged along the material flow direction so that the powder and plastic granules can enter the extruder uniformly, thereby ensuring that the extruder can continuously and uniformly extrude the material. Further, please refer to... Figure 3 and Figure 4 The second rotating section 322 includes a rotating body 3221 and a thread 3222. The rotating body 3221 is rotatably mounted on the housing 31 and is eccentrically arranged. The thread 3222 is provided on the rotating body 3221. Thus, by setting the rotating body 3221, the thread 3222 is driven to rotate. By setting the thread 3222, an axial thrust can be generated when the rotating body 3221 rotates, so that the material can be stably and continuously conveyed in the housing.

[0036] In one embodiment of this application, please refer to Figure 3The casing 31 includes a first exhaust port 311 and a second exhaust port 312 connecting to the extrusion chamber. The first exhaust port 311 and the second exhaust port 312 are arranged sequentially along the material flow direction. The first exhaust port 311 is used to connect to the external air, and the second exhaust port 312 is connected to a vacuum device to vacuum adsorb water vapor in the extrusion chamber. During storage and transportation, the mixed material (especially powder) will adsorb moisture from the air. When the material enters the extrusion chamber, the moisture evaporates under high temperature to form water vapor, and some low-molecular-weight volatiles in the material will also form gas. When the material first enters the extrusion chamber, the material has not yet completely melted, and there is a lot of air between the particles. The first exhaust port 311, by connecting to the external air, squeezes out the air and a small amount of water vapor in the mixture when the rotor 32 compresses the mixture and discharges it directly to the outside, so as to prevent the gas backflow from causing the mixture to roll back, and to ensure that the mixture is stably and continuously conveyed in the extrusion chamber. As the mixture moves towards the outlet, the temperature rises to a molten state, and a large amount of moisture in the mixture evaporates, forming a large amount of water vapor. Due to the high viscosity of the molten material, the water vapor cannot escape on its own. At this time, the second exhaust port 312 uses the negative pressure created by the vacuum device to break the surface tension of the material, allowing the water vapor to quickly detach from the material and strongly adsorb and expel the water vapor trapped in the molten material. Thus, by setting the first exhaust port 311 to squeeze the gas to the outside when the mixture is compressed, the mixture can be stably and continuously conveyed in the extrusion chamber. By setting the second exhaust port 312 to absorb the water vapor trapped in the molten material, it is ensured that the molten material entering the molding die 41 is dense, uniform, and free of water vapor, thereby helping to improve the molding quality of the hollow plate. Furthermore, the casing is also provided with a feed port 313 to deliver the high-temperature mixture into the extrusion chamber.

[0037] In one embodiment of this application, please refer to the following: Figure 1 and Figure 2 The feeding mechanism includes a mixing device 2 and a feeding device 1. The mixing device 2 is located above the extruder 3 and is used to feed uniformly mixed powder and plastic granules into the extruder 3. The feeding device 1 is located above the mixing device 2 and is used to feed a fixed amount of powder and plastic granules into the mixing device 2. In this way, by setting the feeding device 1, the feeding amount of powder and plastic granules can be precisely controlled to avoid affecting the performance of the hollow board due to material fluctuations. By setting the mixing device 2, the powder can be uniformly coated on the surface of the plastic granules or dispersed in the matrix, thereby ensuring that the powder and plastic granules input into the extruder 3 are uniformly mixed. Of course, in other embodiments, the feeding mechanism may also directly feed the powder and plastic granules to the extruder 3 without mixing through the mixing device 2. The embodiments of this application do not limit this.

[0038] In one embodiment of this application, please refer to [the relevant documentation]. Figure 1 and Figure 2The mixing device 2 includes a metering component 21 and a mixer 22. The mixer 22 is located above the extruder 3 and is used to feed the uniformly mixed powder and plastic granules to the extruder. The metering component 21 is located above the mixer 22 and is used to feed a fixed amount of powder and plastic granules to the mixer 22. After the feeding device 1 feeds the powder and plastic granules to the metering component 21, the metering component 21 accurately measures the weight of the materials to ensure that the feeding amount of powder and plastic granules strictly meets the production process requirements and avoids unstable performance of the mixture due to material feeding deviation. When the metered mixture enters the mixer 22, the mixer 22 stirs the powder and plastic granules to ensure that the powder and plastic granules are in full contact and interpenetrate, ensuring the uniform distribution of the two components in the mixture. After mixing, the mixer 22 directly feeds the mixture to the extruder 3. Thus, by setting up the metering component 21, the conveying amount of the mixed materials can be precisely controlled to prevent differences in board performance caused by material fluctuations. By setting up the mixer 22, it is ensured that the powder can be evenly coated on the surface of the plastic granules or dispersed in the matrix, reducing surface pitting or mechanical property degradation caused by powder agglomeration, thereby helping to improve the quality of hollow boards.

[0039] Furthermore, when the speed of the mixer 22 is too low, the internal stirring components do not exert enough force on the powder and plastic granules, which cannot effectively break up the agglomeration of the powder. Moreover, the relative movement speed of the two raw materials is slow and the contact time is short, which easily leads to uneven mixing in some areas. For example, the powder may gather at the bottom or edge of the mixer 22 and cannot be fully integrated with the plastic granules. Conversely, when the speed is too high, the excessive speed will increase the friction between the materials, generate a lot of heat, and cause the plastic granules to melt prematurely, forming lumpy agglomerates. This not only affects the uniformity of mixing but also increases the difficulty of cleaning the mixer 22 later. It may even damage the physical properties of the powder due to excessive temperature, affecting the quality of the final hollow board. Based on this, in one embodiment of this application, the rotational speed of the mixer 22 is r, wherein 650rpm≤r≤1500rpm, so that the shearing force and impact force generated by the stirring component in the mixer 22 can just disperse the agglomerated powder particles. This can both drive the powder and granules to form a circulating flow in the mixer 22, ensuring that the powder and granules can fully contact each other and guarantee the dispersion of the powder, and avoid the risk of excessive temperature caused by excessive stirring, reducing the risk of premature softening or melting of plastic granules, maintaining the original characteristics of plastic granules, and thus facilitating their input into the extruder 3.

[0040] In one embodiment of this application, the metering component 21 includes a metering chamber 211, a weighing sensor, and a metering valve. The metering chamber 211 is located above the mixer 22 and is used to collect the powder and plastic granules conveyed by the feeding device 1. The weighing sensor is located in the metering chamber 211 to detect the weight of the metering chamber 211, and the metering valve is located in the metering chamber 211 to adjust the outlet size of the metering chamber 211. When the powder and plastic granules enter the metering chamber 211, the weighing sensor continuously monitors the weight change of the material inside the chamber. When it is necessary to discharge material to the mixer 22, the control system controls the discharge speed by adjusting the opening of the metering valve according to a preset discharge weight target value. During the discharge process, the data from the weighing sensor is fed back to the control system in real time. The system dynamically and precisely adjusts the opening of the metering valve by comparing the difference between the actual weight and the target weight, thereby achieving high-precision quantitative feeding. Thus, by setting up the metering chamber 211, it plays a role in buffering and stabilizing the feeding, reducing the fluctuations in mixing effect, extrusion pressure and temperature caused by feeding fluctuations. By setting up a weighing sensor and an adjustable metering valve, a closed-loop system is formed to achieve real-time metering and precise adjustment of the output, thereby ensuring that the amount of material discharged each time strictly meets the process requirements.

[0041] In one embodiment of this application, please refer to Figure 1 and Figure 2 The feeding device 1 includes two feeding structures 11. Each feeding structure 11 includes a feeding bin 111 and a screw conveyor 112. The feeding bin 111 is located above the mixing device 2 and is used to collect powder or plastic granules. The screw conveyor 112 is located between the feeding bin 111 and the mixing device 2 and is used to transport a fixed amount of powder or plastic granules. In this way, by setting two feeding structures 11, the two feeding bins 111 can collect powder and plastic granules respectively. By controlling the rotation speed of the screw shaft of the screw conveyor 112, a fixed amount of powder can be transported by one screw conveyor 112 and a fixed amount of plastic granules can be transported by the other screw conveyor according to the process requirements. The two are kept independent before entering the mixing device 2 so that they are transported to the mixing device 2 in proportion for mixing, which helps to accurately control the amount of powder and plastic granules transported.

[0042] In one embodiment of this application, please refer to [the relevant documentation]. Figure 1 and Figure 2 The feeding device 1 also includes two vacuum conveyors 12 respectively located in the two feeding bins 111, which are used to transport powder and plastic granules from the raw material bin 6 to the two feeding bins 111 respectively. In this way, by setting up vacuum conveyors 12, on the one hand, materials can be transported in a closed pipeline, effectively reducing dust leakage and helping to achieve clean production; on the other hand, materials can be automatically replenished to the feeding bins 111, which helps to improve feeding efficiency and ensure that the production line can operate continuously and stably for a long time, thereby reducing the probability of material shortage and shutdown due to untimely feeding.

[0043] It should be noted that each raw material bin 6 stores a different type of material, such as powder or plastic granules. Furthermore, the raw material bins 6 and the feeding structure 11 are configured as feeding groups, with multiple feeding groups to transport different materials respectively.

[0044] In one embodiment of this application, please refer to Figure 1 and Figure 2 The hollow board production line 100, which utilizes a one-step extrusion molding process for powder materials, includes a first traction machine 51, a baking oven 52, an air cooler 53, a second traction machine 54, a cutting machine 55, and a stacking machine 56 arranged sequentially along a horizontal direction. The first traction machine 51 transfers the hollow boards from the shaping table 42 to the baking oven 52, where the oven reheats the hollow boards. The air cooler 53 cools the reheated hollow boards. The second traction machine 54 transfers the air-cooled hollow boards to the cutting machine 55, where the cutting machine cuts the hollow boards. The stacking machine 56 transfers the cut hollow boards to a storage area for stacking. The first traction machine 51 stably pulls out the partially shaped but not fully cooled hollow boards continuously drawn from the shaping table 42, providing uniform traction force to ensure the boards are straight. Subsequently, the hollow boards enter the baking oven 52 for reheating. This process eliminates the internal stress generated during the rapid cooling and shaping process, relaxing the molecular chains and improving the dimensional stability and toughness of the hollow boards. After reheating, the hollow boards enter the air cooler 53 for controlled secondary cooling, allowing their temperature to drop uniformly to room temperature and fully set. Then, the fully cooled hollow boards are smoothly fed into the cutting machine 55 by the second traction machine 54, which precisely cuts them according to the set length. Finally, the palletizer 56 automatically stacks the cut finished boards neatly for easy packaging, storage, and transportation. Thus, by setting up the oven and air cooler 53 for heat treatment of the hollow boards, it helps to improve the quality and performance stability of the hollow boards. Furthermore, by using automated traction machines, cutting machines 55, and palletizers 56, the dispersed and independent subsequent processing steps are integrated into a continuous line, which can greatly reduce material transfer and manual intervention in intermediate links, thereby realizing integrated and automated production from raw materials to finished products.

[0045] Based on the above structure, this application also provides a method for producing hollow boards. Please refer to [link / reference]. Figure 5 Hollow core board production methods include: S10: Feeding: The feeding mechanism uniformly conveys the powder and plastic granules to the extruder 3 in a certain proportion; S20: Extrusion: Extruder 3 directly extrudes the input powder and plastic granules into molten material; S30: Molding: The molding die 41 shapes the extruded molten material into a hollow plate, and the shaping table 42 cools and shapes the shaped hollow plate into a hollow plate.

[0046] In this implementation, the feeding step uniformly delivers a fixed amount of powder and plastic granules, providing precisely proportioned raw materials for subsequent processes. This avoids the impact of raw material imbalance on mixing and extrusion effects. The extrusion step utilizes a stretching rheological mechanism to achieve volumetric pulsation conveying, ensuring continuous and stable material transport. In the molding step, the molding die 41 first determines the structural shape of the hollow plate, and then the shaping table 42 fixes the shape, preventing deformation caused by insufficient cooling. Thus, the seamless connection between the feeding and extrusion steps eliminates the intermediate granulation step, allowing the powder and plastic granules to directly enter the extruder 3. This avoids potential material changes due to cooling, and the final shaping and solidification of the product are completed through the molding and shaping steps. This reduces energy consumption and production costs while shortening the production cycle.

[0047] Furthermore, in one embodiment of this application, the material conveyed by the feeding mechanism includes the following mass percentages: powder: 30%-70%, plastic granules: 25%-68%, and small materials: 2%-5%.

[0048] In this embodiment, the powder, as the main filler component, has a proportion of 30%-70%. This not only fully leverages the advantages of solid waste resource utilization, significantly reducing environmental pollution by digesting large amounts of solid waste, but also avoids insufficient fluidity during material melting due to an excessively high proportion, preventing material blockage or incomplete molding during extrusion. The plastic granules, as the matrix material, have a proportion of 25%-68%. This ensures that a continuous phase with sufficient binding force is formed after melting, uniformly coating the dispersed powder and providing basic mechanical strength for the hollow board. This avoids insufficient matrix support leading to easy breakage of the board when the proportion is too low, or increased stress when the proportion is too high. This reduces raw material costs and lowers solid waste utilization efficiency. However, a 2%-5% proportion of minor additives (such as antioxidants, flame retardants, color masterbatches, and other functional additives) can precisely impart specific functions to the hollow board without affecting the uniformity of the main components. For example, adding antioxidants can delay the aging of the board, adding flame retardants can improve fire resistance, and adding trace amounts can avoid excessive minor additives that could lead to a decrease in compatibility between components, preventing delamination or surface defects in the board. Thus, by adopting this ratio, the powder and plastic granules can be directly fed into the extruder for extrusion, while ensuring that the final hollow board meets performance standards.

[0049] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A production line for extrusion of hollow plates by means of a one-step process with powder, characterized in that, The application relates to a hollow plate production device, which comprises: a feeding mechanism for uniformly feeding a certain amount of powder and plastic particles; an extruder (3) arranged below the feeding mechanism and used for directly extruding the powder and plastic particles fed by the feeding mechanism into molten material; a forming mechanism (4) comprising a forming die (41) and a shaping table (42) arranged in sequence in the horizontal direction, the forming die (41) being used for shaping the extruded molten material into a hollow plate, and the shaping table (42) being used for cooling and shaping the shaped hollow plate.

2. The production line for extrusion of hollow plates with powder in one step according to claim 1, characterized in that, The extruder (3) comprises: a casing (31); two rotors (32) rotatably arranged in the casing (31), each of the rotors (32) comprising a first rotating section (321) extending in the axial direction, and the first rotating sections (321) being arranged in a staggered manner; wherein the distance between the two first rotating sections (321) can periodically change when the two rotors (32) rotate.

3. The production line for extrusion of hollow plates with powder in one step according to claim 2, characterized in that, The casing (31) comprises a first exhaust port (311) and a second exhaust port (312) communicating with the extrusion cavity, the first exhaust port (311) and the second exhaust port (312) being arranged in sequence in the material flow direction, the first exhaust port (311) being used for communicating with external air, and the second exhaust port (312) being used for communicating with a vacuum device to vacuum adsorb water vapor in the extrusion cavity.

4. The production line for extrusion of hollow plates with powder in one step according to claim 1, characterized in that, The feeding mechanism comprises: a mixing device (2) arranged above the extruder (3) and used for feeding the extruder (3) with uniformly mixed powder and plastic particles; and a feeding device (1) arranged above the mixing device (2) and used for feeding the mixing device (2) with a certain amount of powder and plastic particles.

5. The production line for extrusion of hollow plates with powder in one step according to claim 4, characterized in that, The mixing device (2) comprises: a mixer (22) arranged above the extruder (3) and used for feeding the extruder (3) with uniformly mixed powder and plastic particles; and a metering assembly (21) arranged above the mixer (22) and used for feeding the mixer (22) with a certain amount of powder and plastic particles.

6. The production line for extrusion of hollow sheet using powder in one step according to claim 5, wherein The metering assembly (21) comprises: a metering bin (211) arranged above the mixer (22) and used for collecting the powder and plastic particles fed by the feeding device (1); a weighing sensor arranged in the metering bin (211) and used for detecting the weight of the metering bin (211); and a metering valve arranged in the metering bin (211) and used for adjusting the size of the outlet of the metering bin (211).

7. The production line for extrusion of hollow plates with powder in one step according to claim 4, characterized in that, The feeding device (1) comprises two feeding structures (11), each of the feeding structures (11) comprising a feeding bin (111) arranged above the mixing device (2) and used for collecting powder or plastic particles, and a screw conveyor (112) arranged between the feeding bin (111) and the mixing device (2) and used for feeding a certain amount of powder or plastic particles.

8. The production line for extrusion of hollow sheet using powder in one step according to claim 1, wherein, The hollow plate production line using the powder one-step extrusion molding method comprises a first traction machine (51), an oven (52), an air cooling machine (53), a second traction machine (54), a cutting machine (55) and a stacking machine (56) arranged in sequence along the horizontal direction, the first traction machine (51) is used to transfer the hollow plate of the shaping table (42) to the oven (52), the oven (52) is used to reheat the hollow plate, the air cooling machine (53) is used to cool the reheated hollow plate, the second traction machine (54) is used to transfer the air-cooled hollow plate to the cutting machine (55), the cutting machine (55) is used to cut the hollow plate, and the stacking machine (56) is used to transfer the cut hollow plate to the storage area for stacking.

9. A method for producing a hollow plate based on a one-step extrusion molding of a hollow plate production line according to any one of claims 1 to 8, characterized by, The hollow plate production method comprises: Feeding: the feeding mechanism uniformly delivers the powder and plastic particles in a certain proportion to the extruder (3); Extrusion: the extruder (3) directly extrudes the input powder and plastic particles into molten material; Molding: the molding die (41) shapes the extruded molten material into a hollow plate, and the shaping table (42) cools and shapes the shaped hollow plate into a hollow plate.

10. The method of producing a hollow plate according to claim 9, wherein The material delivered by the feeding mechanism comprises the following mass percentage: powder: 30%-70%, plastic particles: 25%-68%, and small material: 2%-5%.

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