Extrusion molding system for polyamide heat insulation strip
By introducing a control system consisting of a melt pump and a pressure sensor into the production of polyamide thermal insulation strips, the problem of extrusion flow fluctuations was solved, resulting in product dimensional stability and increased output, while reducing defect rates and material waste.
Patent Information
- Application Number
- CN202423109311.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2034-12-17
AI Technical Summary
Existing single-screw extruders suffer from fluctuations in extrusion flow and pressure during the production of polyamide thermal insulation strips, which affects the dimensional accuracy and yield of the products.
The system employs a control system that includes a melt pump, pressure sensor, PLC microcontroller, and frequency converter. It stabilizes the extrusion flow supply by identifying and compensating for the die head pressure in real time, and ensures temperature control accuracy by combining it with a temperature sensor.
It improves the dimensional stability of extruded products, reduces defect rates and raw material waste, and increases the output and ease of use of the extruder.
Smart Images
Figure CN223835017U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat insulation strip processing technology, and in particular to a polyamide heat insulation strip extrusion molding system. Background Technology
[0002] Thermal insulation strips are typically composed of polyamide (PA) and glass fiber, with the polyamide content being no less than 65% and the glass fiber content being 25% ± 2.5%. This material combination gives the thermal insulation strips good mechanical properties and thermal stability, making them suitable for building applications such as aluminum alloy doors and windows and curtain walls. A single-screw extruder is required in the production and molding process of thermal insulation strips.
[0003] Single-screw extruders have always suffered from fluctuations in extrusion flow rate or pressure. This becomes a problem that must be solved in applications requiring precise extrusion flow rate for thermal insulation strips. Many factors affect the stability of extrusion flow rate, mainly including extrusion process parameters (die pressure, screw speed), equipment structural parameters, and the performance parameters of the resin being processed. The interaction and effect of these factors often exacerbate flow rate fluctuations, leading to a decrease in the dimensional accuracy of the extruded products and product defects. Considering the above conditions, how to compensate for and control the die pressure is the key to solving the problem. Therefore, this utility model proposes a polyamide thermal insulation strip extrusion molding system to solve the problems existing in the prior art. Summary of the Invention
[0004] To address the aforementioned issues, this invention proposes a polyamide heat insulation strip extrusion molding system. This system facilitates stable extrusion flow supply, improves the dimensional stability of extruded products, reduces the defect rate of finished products, minimizes raw material waste, and increases extruder output.
[0005] To achieve the purpose of this utility model, the utility model is implemented through the following technical solution: a polyamide heat insulation strip extrusion molding system, including an extrusion assembly and a melt pump, the extrusion assembly including a base and a drive motor, the drive motor being disposed on one side above the base, and an extrusion pipe being provided on one side of the drive motor, and a die head being provided on one side of the extrusion pipe, the melt pump having an input pipe and an output pipe respectively at both ends, the input pipe being connected to the die head, the output pipe being connected to a mold, and the melt pump being driven by a drive component;
[0006] Pressure sensors are installed on both the input and output tubes, and the signal output terminals of the pressure sensors are connected to the controller. The controller includes a frame and a PLC microcontroller. The PLC microcontroller is located inside the frame and is equipped with an A / D converter and a D / A converter. The A / D converter receives the signal from the pressure sensor, and the instruction output terminal of the D / A converter is connected to the frequency converter of the drive unit.
[0007] A further improvement is that: a spiral shaft is provided inside the extrusion tube for rotation, the output end of the drive motor is connected to the spiral shaft, and a material cylinder is provided on one side above the extrusion tube.
[0008] A further improvement is that temperature sensors are installed inside the extrusion tube, the die head, and the mold, and the signal output of the temperature sensors is connected to the manual control center.
[0009] A further improvement is that the drive unit includes a base plate and a reducer, the reducer is located above the base plate, and the input end of the reducer is connected to a motor, and the frequency converter is built into the motor.
[0010] A further improvement is that a bracket is provided above the reducer, the melt pump is located above the bracket, and a connecting piece is connected between the output end of the reducer and the drive end of the melt pump.
[0011] A further improvement is that: universal wheels are provided at the four corners of the bottom of the base plate, and screws are threadedly installed at the four corners inside the base plate, with the lower end of the screws connected to support feet.
[0012] A further improvement is that the input pipe and the machine head are connected by a flange, and the output pipe and the mold are connected by a flange.
[0013] The beneficial effects of this utility model are as follows:
[0014] 1. This utility model utilizes the pressurization and metering characteristics of a melt pump, combining it in series with the die head of an extrusion assembly and connecting it to the mold. By integrating the advantages of both the extrusion assembly and the melt pump, it compensates for the die head pressure. Pressure sensors on the input and output pipes identify the pressure in real time. The identification signals are converted by an A / D converter and input to the PLC microcontroller to calculate the signal difference between the two pressure sensors. This difference is compared with the set pressurization pressure value to determine the parameters that need adjustment. The parameters are then converted into instructions by a D / A converter and input to the frequency converter of the drive unit, thereby controlling the compensation of the melt pump. This helps to stabilize the extrusion flow supply, improve the dimensional stability of the extruded products, reduce the defect rate of finished products, reduce raw material waste, and increase extruder output.
[0015] 2. The melt pump of this utility model is mounted on the drive unit and connected to the extrusion assembly via a flange. It is easy to move at any time through the action of casters, and the support legs are easy to support on the ground through the action of screws and the height can be adjusted by threads. Thus, the melt pump can be adapted to different extrusion assemblies and is more convenient to use. Attached Figure Description
[0016] Figure 1 This is the front view of the present invention;
[0017] Figure 2This is a schematic diagram of the driving component of this utility model;
[0018] Figure 3 This is a schematic diagram of the controller of this utility model;
[0019] Figure 4 This is a schematic diagram of the control principle of this utility model.
[0020] The components are as follows: 1. Melt pump; 2. Base; 3. Drive motor; 4. Extrusion tube; 5. Die head; 6. Input tube; 7. Output tube; 8. Mold; 9. Pressure sensor; 10. Controller; 11. Frame; 12. PLC control microcontroller; 13. A / D converter; 14. D / A converter; 15. Screw shaft; 16. Barrel; 17. Base plate; 18. Reducer; 19. Motor; 20. Bracket; 21. Connecting parts; 22. Flange; 23. Casters; 24. Screw. Detailed Implementation
[0021] To deepen the understanding of this utility model, the following detailed description will be provided in conjunction with embodiments. These embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model. Example 1
[0022] according to Figure 1 , 2 As shown in Figures 3 and 4, this embodiment proposes a polyamide thermal insulation strip extrusion molding system, including an extrusion assembly and a melt pump 1. The extrusion assembly includes a base 2 and a drive motor 3. The drive motor 3 is located on one side above the base 2, and an extrusion pipe 4 is provided on one side of the drive motor 3. A die head 5 is provided on one side of the extrusion pipe 4. An input pipe 6 and an output pipe 7 are respectively provided at both ends of the melt pump 1. The input pipe 6 is connected to the die head 5, and the output pipe 7 is connected to a mold 8. The melt pump 1 is driven by a drive component.
[0023] Pressure sensors 9 are installed on both the input pipe 6 and the output pipe 7, and the signal output terminals of the pressure sensors 9 are connected to the controller 10. The controller 10 includes a frame 11 and a PLC regulating microcontroller 12. The PLC regulating microcontroller 12 is located inside the frame 11 and is equipped with an A / D converter 13 and a D / A converter 14. The A / D converter 13 receives the signal from the pressure sensor 9, and the instruction output terminal of the D / A converter 14 is connected to the frequency converter of the drive unit. The melt pump 1 is a power device specifically used for conveying, pressurizing, and metering high-temperature, high-viscosity polymer melts. It mainly consists of a pump casing, a drive gear, a driven gear, a sliding bearing, front and rear end plates, and a packing seal. The rotation of the gears carries the melt from the input pipe 6 into the conveying area and then pressurizes it to the output pipe 7, achieving stable and efficient melt conveying. The frame 11 is equipped with a control panel connected to the PLC regulating microcontroller, which facilitates the preset pressurization pressure value of the melt pump 1. In use, the pressurization and metering characteristics of the melt pump 1 are utilized to combine it with other pumps in series. The die 5 of the extrusion assembly is connected to the mold 8. Combining the advantages of the extrusion assembly and the melt pump 1, the pressure of the die 5 is compensated. The pressure is identified in real time by the pressure sensors 9 on the input pipe 6 and the output pipe 7. The identification signal is converted by the A / D converter 13 and input to the PLC regulating microcontroller 12 to calculate the signal difference between the two pressure sensors 9. The difference is compared with the set boost pressure value to obtain the parameters that need to be adjusted. The parameters are then converted into instructions by the D / A converter 14 and input to the frequency converter of the drive component to control the compensation of the melt pump 1.
[0024] The extrusion tube 4 has a rotating screw shaft 15 inside, and the output end of the drive motor 3 is connected to the screw shaft 15. A material cylinder 16 is located on one side above the extrusion tube 4. Temperature sensors are installed inside the extrusion tube 4, the die head 5, and the mold 8, and the signal output ends of the temperature sensors are connected to a manual control center. In use, material is fed through the material cylinder 16, and the drive motor 3 drives the screw shaft 15 to rotate, extruding the material to the die head 5. The temperature sensors identify the material temperature at multiple locations. During production, the key temperature control points of the extrusion system are checked regularly, and emergency plans are developed to ensure that the temperature control range is within ±0.5℃. Example 2
[0025] according to Figure 1 , 2 As shown in Figures 3 and 4, this embodiment proposes a polyamide thermal insulation strip extrusion molding system, including an extrusion assembly and a melt pump 1. The extrusion assembly includes a base 2 and a drive motor 3. The drive motor 3 is located on one side above the base 2, and an extrusion pipe 4 is provided on one side of the drive motor 3. A die head 5 is provided on one side of the extrusion pipe 4. An input pipe 6 and an output pipe 7 are respectively provided at both ends of the melt pump 1. The input pipe 6 is connected to the die head 5, and the output pipe 7 is connected to a mold 8. The melt pump 1 is driven by a drive component.
[0026] Pressure sensors 9 are installed on both the input pipe 6 and the output pipe 7, and the signal output terminals of the pressure sensors 9 are connected to the controller 10. The controller 10 includes a frame 11 and a PLC regulating microcontroller 12. The PLC regulating microcontroller 12 is located inside the frame 11 and is equipped with an A / D converter 13 and a D / A converter 14. The A / D converter 13 receives the signal from the pressure sensor 9, and the instruction output terminal of the D / A converter 14 is connected to the frequency converter of the drive unit. The melt pump 1 is a power device specifically used for conveying, pressurizing, and metering high-temperature, high-viscosity polymer melts. It mainly consists of a pump casing, a drive gear, a driven gear, a sliding bearing, front and rear end plates, and a packing seal. The rotation of the gears carries the melt from the input pipe 6 into the conveying area and then pressurizes it to the output pipe 7, achieving stable and efficient melt conveying. The frame 11 is equipped with a control panel connected to the PLC regulating microcontroller, which facilitates the preset pressurization pressure value of the melt pump 1. In use, the pressurization and metering characteristics of the melt pump 1 are utilized to combine it with other pumps in series. The die 5 of the extrusion assembly is connected to the mold 8. Combining the advantages of the extrusion assembly and the melt pump 1, the pressure of the die 5 is compensated. The pressure is identified in real time by the pressure sensors 9 on the input pipe 6 and the output pipe 7. The identification signal is converted by the A / D converter 13 and input to the PLC regulating microcontroller 12 to calculate the signal difference between the two pressure sensors 9. The difference is compared with the set boost pressure value to obtain the parameters that need to be adjusted. The parameters are then converted into instructions by the D / A converter 14 and input to the frequency converter of the drive component to control the compensation of the melt pump 1.
[0027] The driving component includes a base plate 17 and a reducer 18. The reducer 18 is located above the base plate 17, and its input end is connected to a motor 19. The frequency converter is built into the motor 19. A bracket 20 is provided above the reducer 18, and the melt pump 1 is located above the bracket 20. A connecting piece 21 connects the output end of the reducer 18 and the drive end of the melt pump 1. Universal wheels 23 are provided at each of the four corners of the bottom of the base plate 17, and screws 24 are threadedly installed at each of the four corners inside the base plate 17. The lower end of each screw 24 is connected to a support foot. The input pipe 6 and the machine head 5 are connected via a flange 22, and the output pipe 7 and the mold 8 are connected via a flange 22. The melt pump 1 is a power device specifically designed for conveying, pressurizing, and metering high-temperature, high-viscosity polymer melts. It mainly consists of a pump casing, a drive gear, a driven gear, sliding bearings, front and rear end plates, and packing seals. The rotation of the gears carries the melt from the input pipe 6 into the conveying area, and then pressurizes it to the output pipe 7, achieving stable and efficient melt conveying. During operation, the motor 19 drives the reducer 18, which in turn drives the melt pump 1 through the connecting piece 21. During adjustment, the D / A converter 14 converts the parameters into commands and inputs them to the frequency converter to control the speed of the motor 19, thereby controlling the pipeline pressure. The melt pump 1 is mounted on the drive unit and connected to the extrusion assembly through the flange 22. The casters 23 facilitate easy movement, and the screws 24 allow for easy support on the ground and adjustment of the height, making the melt pump 1 adaptable to different extrusion assemblies and more convenient to use.
[0028] This polyamide thermal insulation strip extrusion molding system utilizes the pressurization and metering characteristics of the melt pump 1, which is connected in series with the die head 5 of the extrusion assembly and connected to the mold 8. By combining the advantages of both the extrusion assembly and the melt pump 1, it compensates for the pressure in the die head 5. Pressure sensors 9 on the input pipe 6 and output pipe 7 identify the pressure in real time. An A / D converter 13 converts the identified signals and inputs them to the PLC microcontroller 12, which calculates the signal difference between the two pressure sensors 9. This difference is compared with the set pressurization pressure value to determine the parameters that need adjustment. A D / A converter 14 then converts these parameters into commands, which are input to the frequency converter of the drive unit to control the compensation of the melt pump 1. This helps stabilize the extrusion flow supply, improve the dimensional stability of the extruded product, reduce the defect rate of the finished product, reduce raw material waste, and increase extruder output. Simultaneously, the melt pump 1 is mounted on the drive unit and connected to the extrusion assembly via a flange 22. Casters 23 facilitate easy movement, and screws 24 allow for easy support on the ground and height adjustment, making the melt pump 1 adaptable to different extrusion assemblies and more convenient to use.
[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A polyamide thermal insulation strip extrusion molding system, comprising an extrusion assembly and a melt pump (1), characterized in that: The extrusion assembly includes a base (2) and a drive unit (3). The drive unit (3) is located on one side above the base (2), and an extrusion pipe (4) is provided on one side of the drive unit (3). A die head (5) is provided on one side of the extrusion pipe (4). An input pipe (6) and an output pipe (7) are provided at both ends of the melt pump (1). The input pipe (6) is connected to the die head (5), and the output pipe (7) is connected to a mold (8). The melt pump (1) is driven by a drive component. Pressure sensors (9) are provided on both the input tube (6) and the output tube (7), and the signal output terminal of the pressure sensor (9) is connected to the controller (10). The controller (10) includes a frame (11) and a PLC regulating microcontroller (12). The PLC regulating microcontroller (12) is located inside the frame (11), and the PLC regulating microcontroller (12) is provided with an A / D converter (13) and a D / A converter (14). The A / D converter (13) receives the signal from the pressure sensor (9), and the instruction output terminal of the D / A converter (14) is connected to the frequency converter of the drive unit.
2. The polyamide thermal insulation strip extrusion molding system according to claim 1, characterized in that: The extrusion tube (4) is equipped with a rotating spiral shaft (15), the output end of the drive machine (3) is connected to the spiral shaft (15), and a material cylinder (16) is provided on one side above the extrusion tube (4).
3. The polyamide thermal insulation strip extrusion molding system according to claim 2, characterized in that: Temperature sensors are provided inside the extrusion tube (4), the die head (5), and the mold (8), and the signal output of the temperature sensors is connected to the manual control center.
4. The polyamide thermal insulation strip extrusion molding system according to claim 1, characterized in that: The drive unit includes a base plate (17) and a reducer (18). The reducer (18) is located above the base plate (17), and the input end of the reducer (18) is connected to a motor (19). The frequency converter is built into the motor (19).
5. The polyamide thermal insulation strip extrusion molding system according to claim 4, characterized in that: A bracket (20) is provided above the reducer (18), and the melt pump (1) is located above the bracket (20). A connector (21) is connected between the output end of the reducer (18) and the drive end of the melt pump (1).
6. The polyamide thermal insulation strip extrusion molding system according to claim 5, characterized in that: The bottom of the base plate (17) is provided with casters (23) at the four corners, and screws (24) are threadedly installed at the four corners inside the base plate (17), with the lower end of the screws (24) connected to the support feet.
7. The polyamide thermal insulation strip extrusion molding system according to claim 1, characterized in that: The input pipe (6) and the head (5) are connected by a flange (22), and the output pipe (7) and the mold (8) are connected by a flange (22).