A water-cooled segmented temperature control system for the extrusion section of stone paper preparation

Abstract

This utility model discloses a water-cooled segmented temperature control system for the extrusion section of stone paper preparation, including a machine base, a screw assembly and drive component, a feeder, a hopper, a cooler, and an industrial chiller. The screw assembly and drive component are mounted on the machine base, and the feeder and hopper for controlling feeding are mounted on the top of the screw assembly and drive component. This water-cooled segmented temperature control system for the extrusion section of stone paper preparation divides the cooling unit into sections according to the required temperature and the internal material temperature, namely a feeding section, a melting section, and a metering and die head section. By recovering the high-temperature medium from the melting section and sending it to the feeding section that requires preheating, the temperature is recovered and reused. At the same time, it can reduce the temperature of the medium circulating to the industrial chiller A, thereby reducing the cooling pressure and energy consumption of the industrial chiller A.

Description

Technical Field

[0001] This utility model relates to the technical field of stone paper production equipment, specifically a water-cooled segmented temperature control system for the extrusion section of stone paper preparation. Background Technology

[0002] Stone paper is a new type of environmentally friendly paper. Its raw materials are mainly inorganic minerals, with a small amount of polymer materials and other auxiliary materials. The inorganic mineral powder (core raw material) is mainly calcium carbonate (CaCO3), and may also contain mineral powders such as talc and kaolin. The proportion of mineral powders such as calcium carbonate is usually as high as 70%-80%, which is the "skeleton" of stone paper and gives the paper its basic physical form (such as hardness and stiffness). Utilizing its natural whiteness and opacity, it can replace plant fibers in traditional paper and reduce wood consumption.

[0003] The twin-screw extruder solves the key process pain points in stone paper production, such as "difficulty in dispersing high calcium carbonate, easy degradation of resin, and low sheet precision," through its three core advantages: high filling and mixing capacity, precise temperature control and plasticizing, and stable extrusion molding. It is the "core equipment" for stone paper to move from laboratory formulation to industrial mass production. Its performance directly determines the physical properties (strength, flatness), production efficiency and cost control of stone paper, and it has now become the standard equipment in mainstream stone paper production lines.

[0004] The core function of the water cooling system in a twin-screw extruder (commonly used for extrusion molding of materials such as plastics and rubber) is to precisely control the temperature during the extrusion process, prevent the material from degrading and carbonizing due to local overheating, and protect equipment components (such as the barrel and screw) from high-temperature wear, ensuring stable extruded product quality. Since the required temperatures for the sections of a twin-screw extruder differ, the currently configured media cooling systems output the same temperature. Furthermore, the material entering the feeding section needs to be preheated by heating wires, which not only wastes heat but also increases the energy consumption of the cooling equipment. Therefore, this application is submitted to optimize and upgrade the existing technology. Utility Model Content

[0005] The purpose of this invention is to provide a water-cooled segmented temperature control system for the extrusion section of stone paper preparation, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A water-cooled segmented temperature control system for the extrusion section of stone paper preparation includes a machine base, a screw assembly and drive unit, a feeder, a hopper, a cooler, and an industrial refrigeration unit. The screw assembly and drive unit are mounted on the machine base. The feeder and hopper for controlling the feeding are mounted on the top of the screw assembly and drive unit. The cooler is installed outside the screw assembly and drive unit to cool and exchange heat with the internal material. The cooler consists of multiple cooling units. The extrusion process is divided into a feeding section, a melting section, and a metering and die head section. The cooling unit includes a housing, connecting flanges, a material tank, a water collector a, a coil, and a water distributor a. Connecting flanges are provided on both sides of the housing. The cooling unit is connected and fixed in parallel by connecting flanges and bolts. A material tank is fixedly installed inside the housing. A coil is arranged outside the material tank inside the housing. A water distributor a and a water collector a are installed at the inlet and outlet ends of the coil, respectively. There are two industrial chillers, namely industrial chiller A and industrial chiller B. The cold medium output end of industrial chiller A is connected to water distributor a of the melting section cooling unit through water distributor b. The medium output from the melting section cooling unit is transported to water distributor c through a transfer pipeline. Water distributor c then transports the medium to water distributor a of the feeding section cooling unit. The medium output from the feeding section cooling unit is sent back to industrial chiller A for recycling through a recovery pipeline. The cold medium output end of industrial chiller B is connected to the water distributor a of the metering and head section cooling unit through water distributor d. After heat exchange, it is sent back to industrial chiller B for recycling through circulation pipeline.

[0007] As a further improvement of this utility model: the cooling unit is provided with two sets of coils symmetrically distributed front and back, each responsible for cooling and heat exchange on one side of the installation. The input and output ends of the two sets of coils are connected through a water distributor a and a water collector a, respectively, to control the uniform distribution of the fluid medium.

[0008] As a further embodiment of this utility model: the water distributors c, b, and d have the same structure and distribute the medium evenly to the cooling units of the feeding section, melting section, metering section, and head section, respectively. The water distributors c, b, and d are connected to the water distributors a of each cooling unit through multiple branch pipes.

[0009] As a further embodiment of this utility model: one end of the water collector a of the cooling unit is connected to the recovery pipeline, the medium output by the feeding section cooling unit is sent to the industrial chiller A through the recovery pipeline, the medium output by the melting section cooling unit is sent to the transfer pipeline through the recovery pipeline, and the medium output by the metering and head section cooling unit is sent to the circulation pipeline through the recovery pipeline.

[0010] As a further improvement of this utility model, temperature sensors are installed on both the branch pipe and the recovery pipeline to monitor the inlet and outlet temperatures of the medium in each cooling unit.

[0011] As a further embodiment of this utility model: a transfer tank a is provided between the recovery pipeline and the industrial chiller A, and the industrial chiller A and the water distributor b are connected by a medium pipeline, on which a liquid pump a is provided.

[0012] As a further improvement of this utility model: a liquid pump b is provided between the industrial chiller B and the water distributor d, and a transfer tank b is installed on the circulation pipeline.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This water-cooled segmented temperature control system for the extrusion section of stone paper production divides the cooling unit into sections: a feeding section, a melting section, and a metering and die head section, based on the required temperature and the internal material temperature. By recovering the high-temperature medium from the melting section and sending it to the feeding section that requires preheating, the temperature is recovered and reused. At the same time, it can reduce the temperature of the medium circulating to the industrial chiller A, thereby reducing the refrigeration pressure and energy consumption of the industrial chiller A. Attached Figure Description

[0014] Figure 1 A schematic diagram of a water-cooled segmented temperature control system for the extrusion section of stone paper; Figure 2 A schematic diagram of pipeline connections in a water-cooled segmented temperature control system for the extrusion section of stone paper preparation. Figure 3 A schematic diagram of the cooler in a water-cooled segmented temperature control system for the extrusion section of stone paper preparation. Figure 4 A cross-sectional view of the cooler in a water-cooled segmented temperature control system for the extrusion section of stone paper preparation.

[0015] In the diagram: 1. Base; 2. Screw assembly and drive components; 3. Feeder; 4. Hopper; 5. Cooler; 501. Housing; 502. Connecting flange; 503. Material bucket; 504. Water collector a; 505. Coil; 506. Water distributor a; 6. Branch pipe; 7. Recovery pipeline; 8. Water distributor c; 9. Transfer pipeline; 10. Transfer tank a; 11. Industrial chiller A; 12. Liquid pump a; 13. Medium pipeline; 14. Water distributor b; 15. Water distributor d; 16. Liquid pump b; 17. Industrial chiller B; 18. Transfer tank b; 19. Circulation pipeline; 20. Temperature sensor. Detailed Implementation

[0016] Please see Figures 1-4In this embodiment of the invention, a water-cooled segmented temperature control system for the extrusion section of stone paper preparation includes a base 1, a screw assembly and drive component 2, a feeder 3, a hopper 4, a cooler 5, and an industrial chiller. The base 1 is equipped with the screw assembly and drive component 2. The top of the screw assembly and drive component 2 is equipped with the feeder 3 and the hopper 4 for controlling feeding. The cooler 5 is installed outside the screw assembly of the screw assembly and drive component 2 to cool and exchange heat with the internal material. The cooler 5 consists of multiple cooling units. The extrusion process is divided into a feeding section, a melting section, and a metering and die head section. The feeding section is a low-temperature zone, requiring the internal material, such as PVC or PE, to be heated to a certain temperature, which must be below the melting point of the material, such as PVC. The glass transition temperature is about 80℃. To prevent the material from melting too early and clogging the feed inlet, it currently relies on an external heating electric heating coil. The melting section completes the transformation of the material from solid to molten state. Shear heat dominates the temperature rise, the material viscosity decreases, the fluidity increases, and the temperature is not too high or too low. The metering and die head sections need to be further cooled to reduce the internal material temperature. Temperature comparison of each section: feeding section < melting section > metering and die head section; The cooling unit includes a housing 501, a connecting flange 502, a material tank 503, a water collector a504, a coil 505, and a water distributor a506. The housing 501 has connecting flanges 502 on both sides. The cooling unit is fixedly connected by the connecting flanges 502 and bolts. The material tank 503 is fixedly installed inside the housing 501. The coil 505 is arranged outside the material tank 503 inside the housing 501. The water distributor a506 and the water collector a504 are installed at the input and output ends of the coil 505, respectively. There are two industrial chillers, namely industrial chiller A11 and industrial chiller B17. The cold medium output end of industrial chiller A11 is connected to water distributor a506 of the melting section cooling unit through water distributor b14. The medium output from the melting section cooling unit is transported to water distributor c8 through transfer pipeline 9. The medium is then transported to water distributor a506 of the feeding section cooling unit through water distributor c8. The medium output from the feeding section cooling unit is sent back to industrial chiller A11 for recycling through recovery pipeline 7. The cold medium output end of industrial chiller B17 is connected to water distributor a506 of metering and head section cooling unit via water distributor d15. After heat exchange, it is sent back to industrial chiller B17 for recycling through circulation pipeline 19. The medium enters the melting section to cool the material inside the melting section, and the heat is transferred to the medium, raising the medium temperature to 70-90 degrees Celsius. After exiting the melting section, the medium enters the feeding section to preheat the material inside the feeding section, bringing it to a higher temperature, thus achieving heat recovery and utilization. The temperature of the medium can be improved by the circulation speed of the medium. The slower the circulation speed, the higher the temperature of the medium exiting the melting section and the lower the cooling efficiency of the melting section. The faster the circulation speed, the shorter the heat exchange time in the melting section and the lower the temperature of the medium exiting the melting section, and the higher the cooling efficiency of the melting section. By controlling the circulation speed, the temperature of the medium entering the feeding section is controlled, and the temperature of the medium is further reduced in the feeding section before entering industrial chiller A11. This reduces the cooling pressure and energy consumption of industrial chiller A11, while also recovering and utilizing the heat from the melting section.

[0017] In a preferred embodiment, the cooling unit is provided with two sets of coils 505 symmetrically distributed front and back, each responsible for cooling and heat exchange on one side of the installation. The input and output ends of the two sets of coils 505 are connected through a water distributor a506 and a water collector a504, respectively, to control the uniform distribution of the fluid medium. The flow velocity of the medium is related to the heat exchange efficiency and the efficiency of subsequent heat recovery. Therefore, the water distributor a506 and the water collector a504 are provided to control the uniformity of the flow velocity and flow rate within the coils 505.

[0018] As a further embodiment of this utility model: water distributors c8, b14, and d15 have the same structure, and uniformly distribute the medium to the cooling units of the feeding section, melting section, and metering and head section, respectively. Water distributors c8, b14, and d15 are connected to the water distributors a506 of each cooling unit through multiple branch pipes 6. One end of the water collector a504 of the cooling unit is connected to the recovery pipeline 7. The medium output from the cooling unit of the feeding section is sent to the industrial chiller A11 through the recovery pipeline 7. The medium output from the cooling unit of the melting section is sent to the transfer pipeline 9 through the recovery pipeline 7. The medium output from the cooling unit of the metering and head section is sent to the circulation pipeline 19 through the recovery pipeline 7. Temperature sensors 20 are installed on both the branch pipes 6 and the recovery pipeline 7. The temperature sensors 20 monitor the temperature of the medium entering and exiting each cooling unit.

[0019] In a preferred embodiment, a transfer tank a10 is provided between the recovery pipeline 7 and the industrial chiller A11. The industrial chiller A11 is connected to the water distributor b14 via a medium pipeline 13, on which a liquid pump a12 is provided. A liquid pump b16 is provided between the industrial chiller B17 and the water distributor d15. A transfer tank b18 is installed on the circulation pipeline 19. As the temperature rises, some of the medium increases in volume or partially vaporizes, resulting in increased internal pressure in the pipeline. Therefore, a transfer tank is provided to buffer the pipeline pressure and provide a certain reserve of medium. The refrigeration equipment is divided into industrial chiller A11 and industrial chiller B17. Industrial chiller A11 is responsible for cooling the recovery medium in the feeding section where the temperature is high and the temperature recovery is unstable after heat recovery. Industrial chiller B17 is responsible for cooling the recovery medium in the metering and head section where the temperature is low and the temperature recovery is stable.

[0020] It should be noted that all the above embodiments belong to the same utility model concept, and the descriptions of each embodiment have different focuses. Where the description in a particular embodiment is not detailed, please refer to the description in other embodiments.

[0021] The embodiments described above merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A water-cooled segmented temperature control system for the extrusion section of stone paper preparation, comprising a base (1), a screw assembly and drive component (2), a feeder (3), a hopper (4), a cooler (5), and an industrial chiller, wherein the screw assembly and drive component (2) are mounted on the base (1), and the feeder (3) and hopper (4) for controlling feeding are mounted on the top of the screw assembly and drive component (2), and the cooler (5) is installed on the outside of the screw assembly of the screw assembly and drive component (2) to cool and exchange heat with the internal material, characterized in that, The cooler (5) consists of multiple cooling units, and the extrusion process is divided into a feeding section, a melting section, and a metering and die head section. The cooling unit includes a housing (501), a connecting flange (502), a material tank (503), a water collector a (504), a coil (505), and a water distributor a (506). The housing (501) is provided with connecting flanges (502) on both sides. The cooling unit is connected and fixed by connecting flanges (502) and bolts side by side. The material tank (503) is fixedly installed inside the housing (501). The coil (505) is arranged outside the material tank (503) inside the housing (501). The water distributor a (506) and the water collector a (504) are installed at the input and output ends of the coil (505), respectively. There are two industrial chillers, namely industrial chiller A (11) and industrial chiller B (17). The cold medium output end of industrial chiller A (11) is connected to the water distributor a (506) of the melting section cooling unit through water distributor b (14). The medium output from the melting section cooling unit is transported to water distributor c (8) through transfer pipeline (9). The medium is transported to water distributor a (506) of the feeding section cooling unit through water distributor c (8). The medium output from the feeding section cooling unit is sent to industrial chiller A (11) for recycling through recovery pipeline (7). The cold medium output end of the industrial chiller B (17) is connected to the water distributor a (506) of the metering and head section cooling unit through the water distributor d (15). After heat exchange, it is sent back to the industrial chiller B (17) for recycling through the circulation pipeline (19).

2. The water-cooled segmented temperature control system for the extrusion section of stone paper preparation according to claim 1, characterized in that, The cooling unit is equipped with two sets of coils (505) symmetrically distributed front and back, each responsible for cooling and heat exchange on one side of the installation. The input and output ends of the two sets of coils (505) are connected through a water distributor a (506) and a water collector a (504) respectively to control the uniform distribution of the fluid medium.

3. The water-cooled segmented temperature control system for the extrusion section of stone paper preparation according to claim 1, characterized in that, The water distributors c (8), b (14) and d (15) have the same structure and distribute the medium evenly to the cooling units of the feeding section, melting section and metering and head section respectively. The water distributors c (8), b (14) and d (15) are connected to the water distributors a (506) of each cooling unit through multiple branch pipes (6).

4. The water-cooled segmented temperature control system for the extrusion section of stone paper preparation according to claim 3, characterized in that, One end of the water collector a (504) of the cooling unit is connected to the recovery pipeline (7). The medium output from the feeding section cooling unit is sent to the industrial chiller A (11) through the recovery pipeline (7). The medium output from the melting section cooling unit is sent to the transfer pipeline (9) through the recovery pipeline (7). The medium output from the metering and head section cooling unit is sent to the circulation pipeline (19) through the recovery pipeline (7).

5. The water-cooled segmented temperature control system for the extrusion section of stone paper preparation according to claim 4, characterized in that, Temperature sensors (20) are installed on both the branch pipe (6) and the recovery pipeline (7). The temperature sensors (20) monitor the temperature of the medium entering and exiting each cooling unit.

6. The water-cooled segmented temperature control system for the extrusion section of stone paper preparation according to claim 1, characterized in that, A transfer tank a (10) is provided between the recovery pipeline (7) and the industrial chiller A (11). The industrial chiller A (11) and the water separator b (14) are connected through a medium pipeline (13). A liquid pump a (12) is provided on the medium pipeline (13).

7. The water-cooled segmented temperature control system for the extrusion section of stone paper preparation according to claim 1, characterized in that, A liquid pump b (16) is installed between the industrial chiller B (17) and the water distributor d (15), and a transfer tank b (18) is installed on the circulation pipeline (19).

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