Efficient extrusion molding device for polycarbonate plates

Abstract

The invention belongs to the technical field of polycarbonate sheet production and manufacturing, and discloses a polycarbonate sheet efficient extrusion molding device which comprises an extrusion barrel and a mold body. According to the high-efficiency extrusion molding device for the polycarbonate sheet, some problems existing in actual use of an existing high-efficiency extrusion molding device for the polycarbonate sheet can be effectively solved, firstly, an infrared heating control mode based on heating power calculation is adopted, a polycarbonate raw material and a mold body are accurately heated, uniform heating is ensured, and the phenomenon of non-uniform cooling is avoided; according to the invention, dynamic adjustment of the heating power is realized by combining the application of a detection unit and a dynamic adjustment formula, so that the response capability of the whole temperature control system is improved, and finally, the cooling liquid flow can be adjusted according to the actual temperature difference by monitoring the temperature of the cooling area and controlling the cooling liquid flow, so that the cooling effect is further improved. And the stability and the consistency of the product quality are ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of production and manufacturing of polycarbonate sheets, in particular to a high-efficiency extrusion molding device for polycarbonate sheets. Background Art

[0002] Existing high-efficiency extrusion molding devices for polycarbonate sheets usually include an extrusion barrel, a mold body and related heating and cooling systems. A spiral feeding assembly is provided in the extrusion barrel to transport the polycarbonate raw material from the feed hopper to the molding block of the mold body. The mold body is generally composed of a molding block and a cooling block. Heating and cooling control are used to ensure that the polycarbonate raw material is evenly heated and smoothly molded in the mold. In order to improve the molding efficiency, a heating assembly is usually provided on the extrusion barrel and the outer surface of the mold so that the molten polycarbonate raw material is evenly heated before entering the molding block. At the same time, the cooling assembly cools down by the flow of cooling water so that the final sheet can be quickly solidified.

[0003] The existing high-efficiency extrusion molding device for polycarbonate sheets has some problems in actual use, especially the shortcomings of the temperature control system. First, due to the inaccurate temperature control of the molding block of the mold body, the surface of the polycarbonate sheet may cool rapidly when entering the mold, resulting in defects such as poor surface quality, bubbles or cracks, thereby affecting the molding effect. Secondly, although the existing technology heats the extrusion barrel through a heating component, it is impossible to achieve accurate and dynamic heating control of the polycarbonate raw material and the mold body, resulting in uneven heating and low production efficiency. In addition, the existing cooling system cannot accurately adjust the coolant flow rate, resulting in low cooling efficiency and uneven cooling, which in turn affects the curing speed and molding quality of the sheet.

[0004] Therefore, there is an urgent need for an efficient polycarbonate sheet extrusion molding device that can achieve precise temperature control and dynamic adjustment to solve the above problems and improve production quality and efficiency. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides a polycarbonate sheet high-efficiency extrusion molding device, which has the advantages of intelligent temperature control system, precise heating, dynamic adjustment of heating power and optimized coolant flow control, and can improve heating uniformity, cooling effect and stability of product quality.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a polycarbonate sheet high-efficiency extrusion molding device, comprising an extrusion barrel and a mold body, wherein the mold body comprises a molding block and a cooling block from right to left, wherein the molding block and the cooling block are plugged in, and heating components are arranged at the middle of the outer surface of the extrusion barrel and the outer surface of the molding block, wherein one of the heating components comprises a first infrared heater distributed in a linear array on the surface of the extrusion barrel, and a cooling component distributed in a linear array is arranged inside the cooling block, wherein the cooling component comprises a cooling dark channel in a continuous S-bend shape; It also includes a detection unit, an analysis and processing unit and a control unit, wherein: When heating, the analysis and processing unit calculates the required power, the control unit issues instructions, the heating component works, the detection unit monitors the temperature and provides feedback, and the analysis and processing unit dynamically adjusts the power; During cooling, the detection unit monitors the temperature of the cooling block and provides feedback. The analysis and processing unit calculates the amount of heat exchange that needs to be adjusted based on the difference between the current temperature of the cooling zone and the preset temperature threshold, and the control unit adjusts the speed of the variable frequency pump.

[0007] Preferably, a feeding motor is fixedly mounted on the right side surface of the extrusion barrel, and a screw feeding assembly is provided inside the extrusion barrel for realizing a screw feeding action on the polycarbonate raw material flowing in through the extrusion barrel feed hopper, the screw feeding assembly includes a rotating screw rotatably sleeved on the right side inner wall of the extrusion barrel, the output shaft of the feeding motor is fixedly connected to the right end of the rotating screw through a coupling, the outer surface of the feeding motor is fixedly connected to a motor mounting frame mounted on the ground, the outer surface of the left end of the rotating screw is provided with a check ring for preventing the conveyed polycarbonate raw material from flowing back, and the control unit is fixedly mounted on the front side of the motor mounting frame.

[0008] Preferably, one of the heating components also includes a limit block fixedly sleeved on the outer surface of the extrusion barrel, the right side surface of the first infrared heater is semicircular, and the upper and lower adjacent two first infrared heaters are slidably connected to form a full circle sleeved on the outer surface of the extrusion barrel.

[0009] Preferably, the right side surfaces of the two upper and lower adjacent first infrared heaters located on the rightmost side of the outer surface of the extrusion cylinder are movably connected to the left side surface of the limit block, and the outer surface of the extrusion cylinder is wrapped with an aerogel adhesive insulation cover, and the right side surface of the aerogel adhesive insulation cover is in contact with the left side surfaces of the two upper and lower adjacent first infrared heaters located on the leftmost side of the outer surface of the extrusion cylinder.

[0010] Preferably, the other heating component comprises a second infrared heater embedded in the upper surface and the lower surface of the forming block, and the feed port of the forming block is fixedly mounted to the discharge area of ​​the extrusion barrel.

[0011] Preferably, after the cooling water flows into the cooling dark channel, the molten polycarbonate sheet extruded through the die head of the extrusion barrel is cooled and solidified. The cooling component also includes a water supply pipe which is symmetrically distributed and connected to an external frequency conversion pump. The right side surface of the water supply pipe is T-shaped, and the two water outlet ends of one water supply pipe are respectively fixedly connected to the water inlet ends of two of the cooling dark channels, and the two water outlet ends of the other water supply pipe are respectively fixedly connected to the water inlet ends of the other two cooling dark channels. The outer surfaces of the two water supply pipes are fixedly connected with flow valves, and the water outlet ends of the upper and lower adjacent cooling dark channels are fixedly connected with water collecting pipes, and a third RTD temperature sensor is fixedly installed on the surface of the cooling block.

[0012] Preferably, the detection unit includes a first infrared temperature sensor fixedly installed in the heating zone of the extrusion barrel, a second infrared temperature sensor fixedly installed in the discharge zone of the extrusion barrel, a third infrared temperature sensor fixedly installed on the right side surface of the forming block, a first RTD temperature sensor fixedly installed on the outer surfaces of the two water supply pipes, and a second RTD temperature sensor fixedly installed on the outer surface of the water collecting pipe.

[0013] Preferably, when a heating component is required to uniformly heat the polycarbonate raw material transported by the screw feeding component, the first infrared temperature sensor and the second infrared temperature sensor collect the surface temperature of the polycarbonate raw material in the heating zone and the discharge zone of the extrusion barrel, and use the weighted average formula to calculate the weighted average of the temperatures in the two different areas.

[0014] Preferably, based on the control amount of heating power required to be adjusted calculated by the analysis and processing unit for the first infrared heater, the control unit forms a first control instruction to adjust the heating power of the first infrared heater in real time; based on the control amount of heating power required to be adjusted calculated by the analysis and processing unit for the second infrared heater, the control unit forms a second control instruction to adjust the heating power of the second infrared heater in real time.

[0015] Preferably, the current temperature of the cooling zone With preset temperature threshold For comparison, if , it means that the coolant flow needs to be increased to increase the heat exchange and thus cool down. Conversely, if , it means reducing the coolant flow.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention adopts three groups of first infrared heaters distributed in a circular array on the outer surface of the extrusion barrel, with a power density of 15W / cm², which can achieve rapid and uniform heating of the polycarbonate raw material to ensure a stable molten state. Secondly, the second infrared heater is embedded on the upper and lower surfaces of the molding block of the mold body, and its 2-5μm wavelength range accurately matches the absorption peak characteristics of the polycarbonate raw material, effectively improving the preheating efficiency and reducing the temperature fluctuation in the initial molding stage.

[0017] 2. The present invention adopts PID control algorithm and realizes dynamic power regulation through real-time temperature feedback, which improves the temperature control accuracy to ±1°C and significantly reduces the quality problems of the board caused by temperature fluctuations. In addition, the algorithm integrates self-learning function, which can automatically optimize the control parameters according to the characteristics of different batches of materials, and has good adaptability and long-term operation stability.

[0018] 3. The present invention innovates and optimizes the existing cooling system: the cooling tunnel adopts a continuous S-shaped bend pipe design, and achieves a turbulent flow state through a Reynolds number Re>4000, which greatly improves the cooling efficiency and shortens the molding cycle; at the same time, it is equipped with a variable frequency pump system to achieve precise control of the coolant flow rate of ±0.5L / min, and can be dynamically adjusted according to the requirements of different cooling stages of the plate, effectively reducing residual stress and improving the overall performance of the product. In addition, by adopting turbulent cooling technology, the cooling rate is increased to ≥5.5℃ / s, which significantly reduces residual stress and improves the quality of the plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a three-dimensional diagram of the water collecting pipe structure of the present invention; Figure 3 It is a three-dimensional diagram of the structure of the second infrared temperature sensor of the present invention; Figure 4 It is a three-dimensional diagram of the structure of the second infrared heater of the present invention; Figure 5 This is a three-dimensional diagram of the cooling dark channel structure of the present invention; Figure 6 It is a three-dimensional diagram of the structure of the first infrared heater of the present invention; Figure 7 It is a three-dimensional diagram of the limit block structure of the present invention; Figure 8 The schematic diagram of the working process of the high-efficiency extrusion molding device for polycarbonate sheet of the present invention.

[0020] In the figure: 1. extrusion barrel; 2. forming block; 3. cooling block; 4. first infrared heater; 41. limit block; 42. aerogel sticky insulation sleeve; 43. second infrared heater; 5. cooling tunnel; 51. water supply pipe; 52. flow valve; 53. water collecting pipe; 54. third RTD temperature sensor; 6. rotating screw; 61. motor mounting bracket; 62. check ring; 7. detection unit; 71. first infrared temperature sensor; 72. second infrared temperature sensor; 73. third infrared temperature sensor; 74. first RTD temperature sensor; 75. second RTD temperature sensor; 8. analysis and processing unit; 9. control unit; 10. feeding motor. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figures 1 to 8 As shown, the present invention provides a high-efficiency extrusion molding device for polycarbonate sheets, comprising an extrusion barrel 1 and a mold body, wherein the mold body comprises a molding block 2 and a cooling block 3 from right to left in sequence, the molding block 2 and the cooling block 3 are plugged in, a feeding motor 10 is fixedly installed on the right side surface of the extrusion barrel 1, a spiral feeding assembly is arranged inside the extrusion barrel 1 for realizing a spiral feeding action for the polycarbonate raw material flowing in through the feeding hopper of the extrusion barrel 1, a heating assembly is arranged in the middle of the outer surface of the extrusion barrel 1 and the outer surface of the molding block 2, one of the heating assemblies comprises a first infrared heater 4 distributed in a linear array on the surface of the extrusion barrel 1, wherein the first infrared heater 4 located in the middle of the outer surface of the extrusion barrel 1 transfers heat to the inner wall of the extrusion barrel 1 by infrared radiation, so that the polycarbonate raw material conveyed by the spiral feeding assembly is evenly heated, and the first infrared heater 4 located on the outer surface of the molding block 2 preheats the molding block 2 of the mold body by infrared radiation to ensure that it can evenly receive the molten polycarbonate raw material. The purpose of this design is: Avoid uneven cooling: If the temperature of the molding block 2 of the mold body is too low, the polycarbonate sheet will cool down quickly after entering the molding block 2 of the mold body, resulting in poor surface quality of the product and even possible molding failure; Improve molding quality: through proper preheating, it can ensure that the molten polycarbonate can flow smoothly when entering the molding block 2 of the mold body and evenly fill the mold cavity, thereby avoiding defects such as bubbles and cracks; usually, the preheating temperature control of the molding block 2 is set to 40-80°C, and the specific temperature range depends on the material of the molding block 2 and the requirements of the plate. A cooling component distributed in a linear array is arranged inside the cooling block 3, and the cooling component includes a cooling dark channel 5 in a continuous S-bend shape. After the cooling water flows into the cooling dark channel 5, the molten polycarbonate plate extruded by the die head of the extrusion barrel 1 is cooled and solidified; It also includes a detection unit 7, an analysis and processing unit 8 and a control unit 9, wherein: When the heating components are needed to heat the polycarbonate raw material and the molding block 2 respectively transported by the screw feeding component, the analysis and processing unit 8 first calculates the power required for each heating using the infrared heating power formula to generate two sets of power calculation results. Secondly, the control unit 9 generates corresponding control instructions to enable the two heating components to start heating respectively. Finally, the detection unit 7 detects the surface temperature of the polycarbonate raw material in the heating zone and the discharge zone of the extrusion barrel 1 and the cavity temperature of the molding block 2, and sends them to the analysis and processing unit 8, and uses the dynamic adjustment formula to calculate the corresponding dynamic adjustment heating power control amount. When the polycarbonate raw material passes through the molding block 2 cavity of the mold body and enters the cooling block 3 for cooling, the detection unit 7 detects the temperature of the cooling zone of the cooling block 3, establishes a cooling zone temperature detection data set, and sends the cooling zone temperature detection data set to the analysis and processing unit 8. Based on the difference between the current temperature of the cooling zone and the preset temperature threshold, the heat exchange amount that needs to be adjusted is calculated, and the required coolant flow rate is calculated based on the obtained heat exchange amount calculation value, and then the control unit 9 forms a control instruction to adjust the speed of the variable frequency pump.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, the spiral feeding assembly includes a rotating screw 6 rotatably sleeved on the right inner wall of the extrusion barrel 1, the output shaft of the feeding motor 10 is fixedly connected to the right end of the rotating screw 6 through a coupling, the outer surface of the feeding motor 10 is fixedly connected to a motor mounting frame 61 installed on the ground, the outer surface of the left end of the rotating screw 6 is provided with a check ring 62 for preventing the conveyed polycarbonate raw material from flowing back, and the control unit 9 is fixedly installed on the front side of the motor mounting frame 61.

[0024] like Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7As shown, one of the heating components also includes a limit block 41 fixedly sleeved on the outer surface of the extrusion barrel 1, the right side surface of the first infrared heater 4 is semicircular, and the two upper and lower adjacent first infrared heaters 4 are slidably inserted to form a full circle sleeved on the outer surface of the extrusion barrel 1, and the right side surfaces of the two upper and lower adjacent first infrared heaters 4 located on the rightmost side of the outer surface of the extrusion barrel 1 are movably engaged with the left side surface of the limit block 41, and the outer surface of the extrusion barrel 1 is wrapped with an aerogel adhesive insulation sleeve 42, and the right side surface of the aerogel adhesive insulation sleeve 42 is in contact with the left side surfaces of the two upper and lower adjacent first infrared heaters 4 located on the leftmost side of the outer surface of the extrusion barrel 1, and the other heating component includes a second infrared heater 43 embedded in the upper and lower surfaces of the forming block 2, and the feed port of the forming block 2 is fixedly installed with the discharge area of ​​the extrusion barrel 1.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the cooling assembly also includes a water supply pipe 51 which is symmetrically distributed and connected to an external frequency conversion pump. The right side surface of the water supply pipe 51 is T-shaped. The two water outlet ends of one water supply pipe 51 are respectively fixedly connected to the water inlet ends of two of the cooling dark channels 5, and the two water outlet ends of the other water supply pipe 51 are respectively fixedly connected to the water inlet ends of the other two cooling dark channels 5. The outer surfaces of the two water supply pipes 51 are fixedly connected with a flow valve 52, and the water outlet ends of the upper and lower adjacent cooling dark channels 5 are fixedly connected with a water collecting pipe 53, and a third RTD temperature sensor 54 is fixedly installed on the surface of the cooling block 3.

[0026] like Figure 8 As shown, the detection unit 7 includes a first infrared temperature sensor 71 fixedly installed in the heating zone of the extrusion barrel 1, a second infrared temperature sensor 72 fixedly installed in the discharge zone of the extrusion barrel 1, a third infrared temperature sensor 73 fixedly installed on the right side surface of the forming block 2, a first RTD temperature sensor 74 fixedly installed on the outer surfaces of the two water supply pipes 51, and a second RTD temperature sensor 75 fixedly installed on the outer surface of the water collecting pipe 53, wherein: When the heating component is required to uniformly heat the polycarbonate raw material conveyed by the screw feeding component, the first infrared temperature sensor 71 and the second infrared temperature sensor 72 collect the surface temperature of the polycarbonate raw material in the heating zone and the discharge zone of the extrusion barrel 1, and use the weighted average formula to calculate the weighted average of the temperatures in the two different zones. In this case, the weighted average formula represents the combined influence of the temperature in the heating zone and the temperature in the discharge zone. The specific calculation formula of the weighted average formula is: ; in, represents the weighted mean temperature, Indicates the surface temperature of the polycarbonate raw material in the heating zone of the extrusion barrel 1, Indicates the surface temperature of the polycarbonate raw material in the discharge area of ​​the extrusion barrel 1, It is a weighted coefficient, which indicates the influence ratio of the heating zone temperature on the comprehensive temperature. The range is 0 to 1 and is usually set according to the actual application. For example, if , which means that the temperature of the heating zone accounts for 70% of the weight, and the temperature of the discharging zone accounts for 30%, so that the heating power can be comprehensively adjusted according to the temperatures of the heating zone and the discharging zone.

[0027] The specific calculation formula of the infrared heating power formula used by the first infrared heater 4 is: ; in, The heating power of radiation is expressed in , represents the emissivity of the polycarbonate raw material, represents the Stefan-Boltzmann constant, which is used to describe the radiation intensity of polycarbonate raw materials, Indicates the heating area of ​​polycarbonate raw materials, in units of , represents the weighted average temperature, i.e. the surface temperature of the polycarbonate raw material, in Kelvin, , Indicates the ambient temperature of the extrusion barrel 1, in Kelvin. ; The specific calculation formula of the infrared heating power formula adopted by the second infrared heater 43 is: ; in, The heat power of radiation is expressed in , represents the emissivity of the molding block 2. In addition, the emissivity The value is usually between 0 and 1, 1 means that the material is an ideal black body, which completely absorbs and emits radiation of all wavelengths; while 0 means that the material has no radiation ability, that is, no thermal radiation. The emissivity of most actual materials is between 0 and 1. represents the Stefan-Boltzmann constant, , used to describe the radiation intensity of the forming block 2, Indicates the heating area of ​​the forming block 2, in units of , Indicates the cavity temperature of molding block 2 in Kelvin. , represents the ambient temperature around the molding block 2, in Kelvin, .

[0028] The dynamic adjustment formula of the first infrared heater 4 by the analysis and processing unit 8 is: ; in, Indicates the control amount of the heating power that needs to be adjusted by the first infrared heater 4, It indicates the preset temperature threshold of the polycarbonate raw material after being heated in the extrusion barrel 1. For example, the temperature threshold is set to 250°C. represents the weighted average temperature actually measured, denote the proportional, integral and differential coefficients respectively, The integral term representing the error represents the accumulation of the difference between the target temperature and the current temperature. The integral term can compensate for long-term and slow errors, ensuring that the heating temperature of the polycarbonate raw material can eventually stabilize at the target temperature. It represents the error differential term, which indicates the rate of change of the difference between the target temperature and the current temperature. The differential term helps to predict the temperature change trend, thereby reducing temperature fluctuations. In the above formula, the control unit 9 dynamically adjusts the infrared heating power by feedback error temperature error, thereby ensuring that the temperature is always kept near the set value; The dynamic adjustment formula of the second infrared heater 43 by the analysis and processing unit 8 is: ; in, Indicates the control amount of heating power that needs to be adjusted. represents the difference between the preset preheating temperature threshold of the forming block 2 and the actual temperature, i.e., the temperature error, wherein the preset preheating temperature threshold of the forming block 2 is set to 180°C in this application, denote the proportional, integral and differential coefficients respectively, Indicates time. In the above formula, the PID controller dynamically adjusts the infrared heating power by feedback error temperature error, thereby ensuring that the temperature always remains near the set value; Based on the control amount of heating power that needs to be adjusted calculated by the analysis and processing unit 8 for the first infrared heater 4, the control unit 9 forms a first control instruction to adjust the heating power of the first infrared heater 4 in real time; based on the control amount of heating power that needs to be adjusted calculated by the analysis and processing unit 8 for the second infrared heater 43, the control unit 9 forms a second control instruction to adjust the heating power of the second infrared heater 43 in real time.

[0029] Compare the current temperature of the cooling zone with the preset temperature threshold. , it means that the coolant flow needs to be increased to increase the heat exchange and thus cool down. Conversely, if , it means reducing the coolant flow; Based on the comparison results, the calculation formula for the heat exchange amount needs to be adjusted as follows: ; in, Indicates the amount of heat exchange that needs to be adjusted. Represents the proportional gain coefficient, which determines the response speed of the temperature deviation to the control quantity. Indicates the preset temperature threshold of the cooling zone. In this application, the temperature threshold is set to 50°C. Indicates the current temperature of the surface of cooling block 3; The required coolant flow rate is calculated as: ; in, Indicates the required coolant flow rate in units of , Represents the specific heat capacity of the coolant in units of , Indicates the coolant temperature difference, that is, the difference between the coolant inlet temperature and the outlet temperature, in units of ; Based on the required coolant flow rate, calculate the speed adjustment ratio of the variable frequency pump to ensure that the change in coolant flow rate matches the target. The specific calculation formula is: ; in, Indicates the speed of the variable frequency pump after adjustment. Indicates the current speed of the variable frequency pump. Indicates the required coolant flow rate, Indicates the current coolant flow rate.

[0030] In addition, we also conducted system tests on 10 groups of trial samples, and the results are as follows: Table 1 Temperature control accuracy test:

[0031] Table 2 Extrusion pressure stability test:

[0032] Table 3 Cooling system efficiency comparison:

[0033] In summary, through the experimental data recorded in the above three tables, we can find that the relationship between temperature accuracy and surface quality is: 1. When the temperature fluctuation is ≤0.5℃ (groups 1-4), the glossiness is stable above 90GU, indicating that the temperature control accuracy has a significant impact on the surface quality; 2. For every 0.1℃ increase in temperature fluctuation, the yellowing index increases by 0.15ΔYI, indicating that the temperature control accuracy is crucial to the color stability of the board; At the same time, the threshold effect of cooling rate is significant. Specifically: 1. When the cooling rate is greater than 5°C / s (groups 7-10), the residual stress is less than 10MPa, indicating that the efficient cooling system can significantly reduce the residual stress; 2. The optimal transmittance window is 4-5°C / s (corresponding to groups 5-8), indicating that the cooling rate has an important influence on the optical properties of the plate.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A polycarbonate sheet high-efficiency extrusion molding device, comprising an extrusion barrel (1) and a mold body, wherein the mold body comprises a molding block (2) and a cooling block (3) from right to left, wherein the molding block (2) and the cooling block (3) are plugged together, and characterized in that: A heating component is provided at the middle of the outer surface of the extrusion barrel (1) and the outer surface of the forming block (2), wherein one of the heating components comprises a first infrared heater (4) distributed in a linear array on the surface of the extrusion barrel (1), and a cooling component distributed in a linear array is provided inside the cooling block (3), wherein the cooling component comprises a cooling dark channel (5) in a continuous S-bend shape; It also includes a detection unit (7), an analysis and processing unit (8) and a control unit (9), wherein: During heating, the analysis and processing unit (8) calculates the required power, the control unit (9) issues instructions, the heating component works, the detection unit (7) monitors the temperature and provides feedback, and the analysis and processing unit (8) dynamically adjusts the power; During cooling, the detection unit (7) monitors the temperature of the cooling block (3) and provides feedback, the analysis and processing unit (8) calculates the amount of heat exchange that needs to be adjusted based on the difference between the current temperature of the cooling zone and a preset temperature threshold, and the control unit (9) adjusts the speed of the variable frequency pump.

2. The polycarbonate sheet high-efficiency extrusion molding device according to claim 1, characterized in that: A feeding motor (10) is fixedly mounted on the right side surface of the extrusion barrel (1), and a screw feeding assembly is arranged inside the extrusion barrel (1) for realizing a screw feeding action for the polycarbonate raw material flowing in through the feed hopper of the extrusion barrel (1). The screw feeding assembly comprises a rotating screw (6) rotatably sleeved on the right side inner wall of the extrusion barrel (1), the output shaft of the feeding motor (10) is fixedly connected to the right end of the rotating screw (6) via a coupling, the outer surface of the feeding motor (10) is fixedly connected to a motor mounting frame (61) mounted on the ground, the outer surface of the left end of the rotating screw (6) is provided with a check ring (62) for preventing the transported polycarbonate raw material from flowing back, and the control unit (9) is fixedly mounted on the front side of the motor mounting frame (61).

3. The polycarbonate sheet high-efficiency extrusion molding device according to claim 2, characterized in that: One of the heating components further comprises a limit block (41) fixedly sleeved on the outer surface of the extrusion barrel (1); the right side surface of the first infrared heater (4) is semicircular in shape; two upper and lower adjacent first infrared heaters (4) are slidably connected to form a full circle sleeved on the outer surface of the extrusion barrel (1).

4. The polycarbonate sheet high-efficiency extrusion molding device according to claim 3, characterized in that: The right side surfaces of the two first infrared heaters (4) located on the rightmost side of the outer surface of the extrusion barrel (1) and adjacent to each other are both movably engaged with the left side surface of the limit block (41); the outer surface of the extrusion barrel (1) is wrapped with an aerogel adhesive insulation sleeve (42); the right side surface of the aerogel adhesive insulation sleeve (42) is in contact with the left side surfaces of the two first infrared heaters (4) located on the leftmost side of the outer surface of the extrusion barrel (1) and adjacent to each other.

5. The polycarbonate sheet high-efficiency extrusion molding device according to claim 4, characterized in that: The other heating component comprises a second infrared heater (43) embedded in the upper surface and the lower surface of the forming block (2), and the feed port of the forming block (2) is fixedly mounted on the discharge area of ​​the extrusion barrel (1).

6. The polycarbonate sheet high-efficiency extrusion molding device according to claim 5, characterized in that: After the cooling water flows into the cooling dark channel (5), the molten polycarbonate sheet extruded through the die head of the extrusion barrel (1) is cooled and solidified. The cooling component also includes a water supply pipe (51) which is symmetrically distributed and connected to an external variable frequency pump. The right side surface of the water supply pipe (51) is T-shaped. The two water outlet ends of one water supply pipe (51) are respectively fixedly connected to the water inlet ends of two of the cooling dark channels (5), and the two water outlet ends of the other water supply pipe (51) are respectively fixedly connected to the water inlet ends of the other two cooling dark channels (5). The outer surfaces of the two water supply pipes (51) are fixedly connected to flow valves (52), and the water outlet ends of the upper and lower adjacent cooling dark channels (5) are both fixedly connected to water collecting pipes (53). A third RTD temperature sensor (54) is fixedly installed on the surface of the cooling block (3).

7. The polycarbonate sheet high-efficiency extrusion molding device according to claim 6, characterized in that: The detection unit (7) comprises a first infrared temperature sensor (71) fixedly mounted on a heating zone of the extrusion barrel (1), a second infrared temperature sensor (72) fixedly mounted on a discharge zone of the extrusion barrel (1), a third infrared temperature sensor (73) fixedly mounted on the right side surface of the forming block (2), a first RTD temperature sensor (74) fixedly mounted on the outer surfaces of the two water supply pipes (51), and a second RTD temperature sensor (75) fixedly mounted on the outer surface of the water collecting pipe (53).

8. The polycarbonate sheet high-efficiency extrusion molding device according to claim 7, characterized in that: When it is necessary to use a heating component to uniformly heat the polycarbonate raw material conveyed by the screw conveying component, the first infrared temperature sensor (71) and the second infrared temperature sensor (72) collect the surface temperature of the polycarbonate raw material in the heating zone and the discharge zone of the extrusion barrel (1), and calculate the weighted average value of the temperatures in the two different zones using a weighted average formula.

9. The polycarbonate sheet high-efficiency extrusion molding device according to claim 8, characterized in that: Based on the control amount of heating power that needs to be adjusted calculated by the analysis and processing unit (8) for the first infrared heater (4), the control unit (9) forms a first control instruction to adjust the heating power of the first infrared heater (4) in real time; based on the control amount of heating power that needs to be adjusted calculated by the analysis and processing unit (8) for the second infrared heater (43), the control unit (9) forms a second control instruction to adjust the heating power of the second infrared heater (43) in real time.

10. The polycarbonate sheet high-efficiency extrusion molding device according to claim 9, characterized in that: Set the current temperature of the cooling zone With preset temperature threshold For comparison, if , it means that the coolant flow needs to be increased to increase the heat exchange and thus cool down. Conversely, if , it means reducing the coolant flow.

Images