Temperature and pressure control system of modified plastic particle extruder for vehicle

Abstract

The utility model discloses a temperature and pressure control system of a modified plastic particle extruder for a vehicle. The particle extruder comprises a machine barrel, a feeding hopper, a screw rod, a reduction gearbox and a machine head die; the machine barrel is sequentially divided into a feeding section, a compression section and a homogenizing section from left to right; the control system comprises four temperature control units, and the four temperature control units are arranged on a feeding section, a compression section, a homogenization section and a machine head die respectively and used for monitoring and controlling the temperature of the feeding section, the compression section, the homogenization section and the machine head die. Each temperature control unit comprises a heating device, a cooling device and a temperature sensor; the pressure control unit is used for monitoring and controlling the internal pressure of the machine barrel and comprises a driving motor in transmission connection with the reduction gearbox and further comprises a pressure sensor and a back pressure valve which are arranged at the discharging end of the machine barrel; and the controller is respectively connected with the four temperature control units and the pressure control unit. Through the design, the internal temperature and pressure of the extruder are more accurately controlled, so that the failure rate and the defective rate are reduced.

Description

Technical Field

[0001] This utility model relates to the field of extruders, and in particular to a temperature and pressure control system for an automotive modified plastic granule extruder. Background Technology

[0002] Common production methods for modified plastic granules for automobiles include blending modification, filler modification, fiber reinforcement modification, and chemical modification. All of these methods require the use of a granule extruder.

[0003] During operation, the internal temperature and pressure of a pellet extruder must be maintained within a suitable range. Appropriate temperature ensures the material remains at a suitable temperature during extrusion, guaranteeing good flowability and plasticity, which is beneficial for plasticization, mixing, and extrusion molding. It also prevents problems such as material degradation and discoloration due to excessively high temperatures, or extrusion difficulties and poor product quality due to excessively low temperatures. Appropriate pressure ensures stable material pressure during extrusion, helping to improve the dimensional accuracy and stability of the product. It avoids quality problems such as bubbles, deformation, and uneven wall thickness caused by pressure fluctuations, and also protects the extruder's screw, barrel, and other components, extending the equipment's service life.

[0004] Existing pellet extruders do not have precise control over their internal temperature and pressure, making it difficult to ensure the stability of their internal temperature and pressure. Therefore, the above-mentioned problems occur frequently. Utility Model Content

[0005] The purpose of this invention is to provide a temperature and pressure control system for automotive modified plastic granule extruders that provides more precise control over internal temperature and pressure.

[0006] The purpose of this utility model is achieved as follows: a temperature and pressure control system for a modified plastic granule extruder for automobiles; the granule extruder includes a barrel, a feed hopper, a screw, a gearbox, and a die head; the barrel is divided into a feeding section, a compression section, and a homogenization section from left to right; the control system includes four temperature control units, respectively located in the feeding section, compression section, homogenization section, and die head, for monitoring and controlling their temperatures; each temperature control unit includes a heating device, a cooling device, and a temperature sensor; a pressure control unit, used to monitor and control the internal pressure of the barrel, including a drive motor connected to the gearbox, and a pressure sensor and a back pressure valve located at the discharge end of the barrel; and a controller, connected to the four temperature control units and the pressure control unit respectively.

[0007] Furthermore, the heating device is an electric heating tube heater, which is spirally distributed along the length of the barrel; the cooling device includes a cooling tube spirally distributed along the length of the barrel, and also includes a cooling component connected to the cooling tube, located below the barrel, for recovering high-temperature cooling water and providing low-temperature cooling water; the electric heating tube heater and the cooling tube are staggered.

[0008] Furthermore, the aforementioned controller is electrically connected to the electric heating tube heaters, cooling components, and temperature sensors of the four temperature control units, as well as the drive motor, back pressure valve, and pressure sensor of the pressure control unit.

[0009] Compared with existing technologies, the advantages of this invention are as follows: the control system provided by this invention provides more precise control over the internal temperature and pressure of the extruder, thereby reducing the failure rate and defect rate. Specifically, four temperature control units are set up to monitor and control the temperature of the feeding section, compression section, homogenization section, and die head separately. A pressure control unit is also set up to monitor and control the pressure of the barrel, thus enabling precise control of the temperature and pressure inside the barrel at each location. Attached Figure Description

[0010] Figure 1 This is a schematic diagram showing the relationship between the present invention and the pellet extruder.

[0011] The components include: 1. barrel, 1a. feeding section, 1b. compression section, 1c. homogenization section, 2. feeding hopper, 3. screw, 4. gearbox, 5. die head, 6. electric heating tube heater, 7. cooling pipe, 8. cooling assembly, 9. temperature sensor, 10. drive motor, 11. back pressure valve, 12. pressure sensor, and 13. controller. Detailed Implementation

[0012] The above-mentioned and other technical features and advantages of this utility model will be described in more detail below with reference to the accompanying drawings.

[0013] Combined with appendix Figure 1As shown, a temperature and pressure control system for a modified plastic granule extruder for automobiles is disclosed. The granule extruder includes a barrel 1, a feed hopper 2, a screw 3, a gearbox 4, and a die head 5. The barrel 1 is divided into a feeding section 1a, a compression section 1b, and a homogenization section 1c from left to right. The control system includes four temperature control units, which are respectively located at the feeding section 1a, compression section 1b, homogenization section 1c, and die head 5, for monitoring and controlling their temperatures. Each temperature control unit includes a heating device, a cooling device, and a temperature sensor 9. A pressure control unit is used to monitor and control the internal pressure of the barrel 1. It includes a drive motor 10 connected to the gearbox 4, and a pressure sensor 12 and a back pressure valve 11 located at the discharge end of the barrel 1. A controller 13 is connected to the four temperature control units and the pressure control unit.

[0014] It should be noted that the reason for segmented temperature control of barrel 1 is as follows: Extruder barrel 1 is usually divided into 35 temperature zones (depending on screw length and process requirements), each corresponding to a different functional section: Feeding section 1a: Material enters in solid form, requiring low temperature to prevent premature melting; Compression section 1b: Material gradually melts, requiring gradual temperature increase; Homogenization section 1c: Melt homogenization, requiring high temperature to maintain fluidity; The purpose of temperature control for die head 5 is to ensure stable molding process, excellent product performance, and improved production efficiency; In summary, the temperature requirements of each section are different, therefore, separate temperature control is required.

[0015] The heating device is an electric heating tube heater 6, which is spirally distributed along the length of the barrel 1; the cooling device includes a cooling tube 7 spirally distributed along the length of the barrel 1, and a cooling component 8 connected to the cooling tube 7, located below the barrel 1, for recovering high-temperature cooling water and providing low-temperature cooling water; the electric heating tube heater 6 and the cooling tube 7 are staggered.

[0016] It should be noted that the spirally staggered cooling pipes 7 and electric heating pipes 6 are in direct contact with the outside of the barrel 1. The heat transfer response between them and the barrel 1 is faster and the heat loss is smaller, thereby reducing the direct heat exchange between the electric heating pipes 6 and the cooling pipes 7 when they are working at the same time, and reducing heat loss. Furthermore, a heat insulation layer can be added between the electric heating pipes 6 and the cooling pipes 7.

[0017] The controller 13 is electrically connected to the electric heating tube heater 6, cooling assembly 8, and temperature sensor 9 of the four temperature control units, as well as the drive motor 10, back pressure valve 11, and pressure sensor 12 of the pressure control unit.

[0018] During monitoring and control,

[0019] Pressure sensor 12 feeds back the pressure signal parameter inside barrel 1 to controller 13. Controller 13 compares it with the set pressure value and outputs a control signal according to the deviation value. If the deviation value is positive, that is, the pressure is too high, controller 13 controls drive motor 10 to reduce speed and increases the opening of back pressure valve 11 to release excess pressure. If the deviation value is negative, the opposite is true. Until the pressure returns to the normal range.

[0020] Temperature sensor 9 detects the temperature in real time and feeds back the temperature parameters from various locations to controller 13. Controller 13 compares the temperature parameters with the set temperature value and outputs a control signal based on the deviation value. If the deviation value is positive, that is, the temperature is too high, controller 13 will reduce the power of the heating device or turn it off, and at the same time turn on the cooling device as appropriate; if the deviation value is negative, the opposite will happen; until the temperature returns to the normal range.

[0021] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A temperature and pressure control system for a modified plastic pellets extruder for vehicle; said pellets extruder comprising a barrel (1), a hopper (2), a screw (3), a reduction gearbox (4), a head die (5); characterized by: The machine barrel (1) is sequentially divided into a feeding section (1a), a compression section (1b) and a homogenizing section (1c) from left to right; the control system comprises a temperature control unit, four of which are arranged at the feeding section (1a), the compression section (1b), the homogenizing section (1c) and the head die (5) respectively, for monitoring and controlling the temperature thereof; each of the temperature control units comprises a heating device, a cooling device and a temperature sensor (9); a pressure control unit for monitoring and controlling the internal pressure of the machine barrel (1), which comprises a driving motor (10) in driving connection with the reduction gearbox (4), and further comprises a pressure sensor (12) and a back pressure valve (11) arranged at the discharge end of the machine barrel (1); a controller (13) connected with the four temperature control units and the pressure control unit respectively.

2. The temperature and pressure control system of a modified plastic pellets extruder for vehicles according to claim 1, characterized in that: The heating device is an electric heating tube heater (6) spirally distributed along the length direction of the machine barrel (1); The cooling device comprises a cooling pipe (7) spirally distributed along the length direction of the machine barrel (1), and further comprises a cooling assembly (8) in communication with the cooling pipe (7) and located below the machine barrel (1) for recycling high-temperature cooling water and providing low-temperature cooling water; the electric heating tube heater (6) and the cooling pipe (7) are arranged in a staggered manner.

3. The temperature and pressure control system of a modified plastic pellets extruder for vehicles according to claim 2, characterized in that: The controller (13) is electrically connected with the electric heating tube heater (6), the cooling assembly (8) and the temperature sensor (9) of the four temperature control units, and electrically connected with the driving motor (10), the back pressure valve (11) and the pressure sensor (12) of the pressure control unit.

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