Polystyrene particle extrusion process

Abstract

The invention discloses a polystyrene particle extrusion process, and belongs to the technical field of plastic product production. Comprising an extrusion device main body, a control execution main module, a data acquisition module, a calculation control module and an execution equipment module are respectively mounted and connected on the extrusion device main body, and instructions for respectively setting the initial rotating speed and the ideal temperature of the front section of a screw rod and the initial rotating speed of the rear section of the screw rod are issued to the execution equipment module and executed by utilizing the control execution main module. A data acquisition module is used for acquiring the current feeding speed and the current temperature in real time, a calculation control module is used for calculating the rotating speed of the front section of a screw rod after adjustment, the rotating speed of the rear section of the screw rod after adjustment and the temperature after adjustment, and a control execution main module issues and executes related adjustment instructions to an execution equipment module. According to the polystyrene particle extrusion process, dynamic self-adaptive control, multi-factor cooperative adjustment and data-based intelligent optimization are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic product production, and particularly to a polystyrene particle extrusion process. Background Art

[0002] With the development and progress of technology, printers have been widely used in people's daily lives, and the manufacturing requirements of printers are also constantly improving. Polystyrene is the third largest plastic variety in the world, with low price. At the same time, polystyrene has the advantages of being colorless, odorless, tasteless and having a smooth surface. Therefore, it is also usually used as the raw material for preparing printer casings.

[0003] In the production process of the polystyrene particle extrusion process, whether there are slight changes in the characteristics of raw materials or fluctuations in the environmental temperature, due to the set fixed production temperature, the fluidity of the material is unstable, making it difficult to monitor the screw torque parameters in real time and difficult to detect unreasonable local temperatures in a timely manner. As a result, product defects are likely to occur due to temperature fluctuations.

[0004] Secondly, in the prior art, simple adjustment based only on the feeding speed will result in insufficient refinement of material conveying and extrusion control.

[0005] In addition, the traditional process mainly relies on post-quality inspection and adjustment after quality problems are found, and it is unable to correct quality deviations in the production process in real time, resulting in a decrease in product qualification rate. Summary of the Invention

[0006] The technical problem to be solved by the present invention is that there are disadvantages in the prior art such as the lack of a dynamic adjustment mechanism, lack of intelligent optimization, lack of prevention and real-time control adjustment. For this reason, we propose a polystyrene particle extrusion process.

[0007] The technical solution mainly is: a polystyrene particle extrusion process, including a main body of an extrusion device, on which a main control execution module, a data acquisition module, a calculation control module and an execution device module are respectively installed and connected; The main control execution module is used to issue and execute an initial setting instruction including the initial rotation speed of the front section of the screw, the ideal temperature, and the initial rotation speed of the rear section of the screw to the execution device module; The data acquisition module is used to collect the current feeding speed and the current temperature in real time; The calculation control module is used to receive the transmission of the initial setting instruction, the current feeding speed, and the current temperature, and observe and record experimental data in the experiment to obtain influence coefficient characteristics; The influence coefficient characteristics include a first influence coefficient, a second influence coefficient, a third influence coefficient, a fourth influence coefficient, a fifth influence coefficient, and a sixth influence coefficient; Obtain the adjusted front - section rotational speed of the screw according to the initial setting instruction, the first influence coefficient, and the second influence coefficient; Obtain the adjusted rear - section rotational speed of the screw according to the adjusted front - section rotational speed of the screw, the third influence coefficient, and the fourth influence coefficient; Obtain the adjusted temperature W according to the adjusted rear - section rotational speed of the screw, the fifth influence coefficient, and the sixth influence coefficient new ; The calculation and control module is used to transmit the adjusted front - section rotational speed of the screw, the adjusted rear - section rotational speed of the screw, and the adjusted temperature W new to the main control and execution module, and the main control and execution module issues and executes relevant adjustment instructions to the execution device module; Among them, the adjustment instructions include the adjusted front - section rotational speed of the screw, the adjusted rear - section rotational speed of the screw, and the adjusted temperature.

[0008] Preferably, the devices used by the main control and execution module include a control system; The devices used by the data acquisition module include a flow sensor and a temperature controller; The devices used by the calculation and control module include the calculation devices within the control system; The devices used by the execution device module include a heating system, a motor control system, and a feeding twin - screw; Among them, the output end of the motor control system is respectively connected to the front section and the rear section of the screw of the feeding twin - screw.

[0009] Preferably, the calculation and control module obtains the first influence amount at the front end of the screw according to the first influence coefficient and the fluctuation of the feeding speed from the initial to the current; Obtain the temperature deviation characteristic according to the difference between the current temperature and the ideal temperature, multiply the temperature deviation characteristic by the second influence coefficient, and obtain the second influence amount at the front end of the screw; Add the initial rotational speed of the front section of the screw, the first influence amount at the front end of the screw, and the second influence amount at the front end of the screw to obtain the adjusted front - section rotational speed of the screw; The specific calculation formula for the adjusted front - section rotational speed LQ of the screw is as follows: ; Among them: LQ is the adjusted front - section rotational speed of the screw; LQ0 is the initial rotational speed of the front section of the screw, and LQ0 represents the rotational speed initially set for the front section of the screw during production; SB is the feeding speed fluctuation value, and SB reflects the difference degree between the current feeding speed and the initial feeding speed; Both t2 and t1 are influence coefficients; t1 reflects the adjustment range of the rotational speed of the front section of the screw when the fluctuation value SB of the feeding speed changes by 1 kg / h. t2 reflects the temperature deviation and the adjustment range of the rotational speed of the front section of the screw when the deviation is 1 °C. W is the current temperature; W0 is the ideal temperature, and W0 is preset according to the production process requirements of polystyrene particles.

[0010] Preferably, after receiving the adjusted rotational speed of the front section of the screw, the calculation control module obtains the first influence amount at the rear end of the screw according to the third influence coefficient and the adjusted rotational speed of the front section of the screw; obtains the second influence amount at the rear end of the screw according to the temperature deviation feature and the fourth influence coefficient; obtains the adjusted rotational speed of the rear section of the screw by using the initial rotational speed of the rear section of the screw, the first influence amount at the rear end of the screw, and the second influence amount at the rear end of the screw; The specific calculation process of the adjusted rotational speed LH of the rear section of the screw is as follows: ; Wherein: LH is the adjusted rotational speed of the rear section of the screw; LH0 is the initial rotational speed of the rear section of the screw, and LH0 represents the initially set rotational speed of the rear section of the screw during production; Both t3 and t4 are influence coefficients; t3 reflects the influence degree of the change in the rotational speed of the front section of the screw on the adjustment of the rotational speed of the rear section of the screw; t4 reflects the temperature deviation and the influence degree on the adjustment of the rotational speed of the rear section of the screw.

[0011] Preferably, after receiving the adjusted rotational speed of the front section of the screw and the adjusted rotational speed of the rear section of the screw, the calculation control module obtains the first temperature influence amount according to the adjusted rotational speed of the front section of the screw, the adjusted rotational speed of the rear section of the screw, and the fifth influence coefficient; obtains the second temperature influence amount according to the fluctuation of the feeding speed from the initial to the current speed and the sixth influence coefficient; obtains the adjusted temperature by using the current temperature, the first temperature influence amount, and the second temperature influence amount; The specific calculation process of the adjusted temperature is as follows: ; Wherein: W new is the adjusted temperature; Both t5 and t6 are influence coefficients; t5 reflects the amplitude of temperature adjustment required when the rotational speed of the rear section of the screw LH changes by 1 r / min after adjustment; t6 reflects the amplitude of temperature adjustment required when the fluctuation value SB of the feeding speed changes by 1 kg / h.

[0012] Preferably, before the calculation and adjustment by the calculation control module, experiments are gradually increased for the influencing coefficient features including feeding speed, temperature, rotational speed of the front section of the screw, and rotational speed of the rear section of the screw, and experimental data is observed and recorded during the experiments. The influencing coefficients are determined by combining experimental data with statistical analysis and machine learning methods, as follows: The first influencing coefficient: Gradually increase the feeding speed, record the change in the rotational speed of the front section of the screw when the feeding speed changes by 1 kg / h, and use the statistical method of linear regression to obtain the first influencing coefficient; The second influencing coefficient: Gradually increase the temperature, record the change in the rotational speed of the front section of the screw when the temperature deviates from the set value by 1 °C, and obtain the second influencing coefficient; The third influencing coefficient: Gradually increase the rotational speed of the front section of the screw, record the degree of influence on the rotational speed of the rear section of the screw, and obtain the third influencing coefficient; The fourth influencing coefficient: Gradually increase the temperature, record the influence of the temperature deviation on the rotational speed of the rear section of the screw, and obtain the fourth influencing coefficient; The fifth influencing coefficient: Gradually increase the rotational speed of the rear section of the screw, record its influence on the temperature, and obtain the fifth influencing coefficient; The sixth influencing coefficient: Gradually increase the feeding speed, record its influence on the temperature, and obtain the sixth influencing coefficient; Among them, gradually increasing specifically includes increasing the speed based on the initial setting instructions of the feeding speed, rotational speed of the front section of the screw, and rotational speed of the rear section of the screw, and increasing the temperature based on the initial setting instructions of the temperature.

[0013] Preferably, the motor control system performs re-setting and adjustment according to the results of the adjusted rotational speed of the front section of the screw and the adjusted rotational speed of the rear section of the screw; The heating system performs re-setting and adjustment according to the result of the adjusted temperature.

[0014] The technical effects and advantages of the present invention: When obtaining the adjusted rotational speed of the front section of the screw in the present invention, the second influencing factor at the front end of the screw takes into account the influence of temperature deviation on the rotational speed of the front section of the screw. By real-time monitoring the difference between the current temperature and the ideal temperature, the rotational speed of the front section of the screw is dynamically adjusted, thereby affecting the conveying and heating of the material, achieving dynamic adaptive adjustment of temperature. In this way, it can better adapt to the changes in raw material characteristics and production environment, reduce product defects caused by temperature fluctuations. During the process of obtaining the adjusted temperature, the influence of the rotational speed change of the rear section of the screw and the feeding speed fluctuation on the temperature is comprehensively considered. By adjusting the adjusted temperature, the temperature control of the entire extrusion process is made more precise.

[0015] In the present invention, the adjusted rotational speed of the front section of the screw is adjusted according to the feeding speed fluctuation and temperature deviation. The adjusted rotational speed of the rear section of the screw is then adjusted in coordination with the adjusted rotational speed of the front section of the screw and the temperature deviation. This multi-factor collaborative control method realizes more refined material conveying and extrusion control.

[0016] In the present invention, the initial setting instructions, the current feeding speed, the current temperature, and the influence coefficient characteristics used to obtain the adjusted rotational speed of the front section of the screw, the adjusted rotational speed of the rear section of the screw, and the adjusted temperature are all calculated based on real-time collected data. By real-time monitoring these parameters and adjusting according to the formula, real-time feedback control of the production process is realized. Once a quality deviation is found, the process parameters can be adjusted in a timely manner, thereby establishing a correlation model between the parameters. This model can automatically adjust the process parameters in advance to achieve preventive control, and change the passive post-quality control to active pre-prevention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the front view of the main body of the extrusion device of the present invention; Figure 2 is the side sectional view of the main body of the extrusion device of the present invention; Figure 3 is the method flow chart of the polystyrene particle extrusion process of the present invention; Figure 4 is the overall module structure schematic diagram of the present invention.

[0018] In the figure: 1 - main body of the extrusion device, 2 - control system, 3 - motor control system, 34 - feeding twin screw, 4 - flow sensor, 5 - heating system, 6 - temperature controller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Now, the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments.

[0020] Refer to Figure 1 and Figure 4As shown in the figure, the present invention provides a polystyrene particle extrusion process, including an extrusion device main body 1, on which a control execution main module, a data acquisition module, a calculation control module and an execution device module are respectively installed and connected; The control execution main module is used to issue and execute an initial setting instruction including the initial rotation speed of the front section of the screw, the ideal temperature, and the initial rotation speed of the rear section of the screw to the execution device module; The data acquisition module is used to collect the current feeding speed and the current temperature in real time; The calculation control module is used to receive the transmission of the initial setting instruction, the current feeding speed, and the current temperature, and observe and record experimental data during the experiment to obtain the influence coefficient characteristics; The influence coefficient characteristics include a first influence coefficient, a second influence coefficient, a third influence coefficient, a fourth influence coefficient, a fifth influence coefficient, and a sixth influence coefficient; According to the initial setting instruction, the first influence coefficient, and the second influence coefficient, the adjusted rotation speed of the front section of the screw is obtained; According to the adjusted rotation speed of the front section of the screw, the third influence coefficient, and the fourth influence coefficient, the adjusted rotation speed of the rear section of the screw is obtained; According to the adjusted rotation speed of the rear section of the screw, the fifth influence coefficient, and the sixth influence coefficient, the adjusted temperature W is obtained. new ; The calculation control module is used to transmit the adjusted rotation speed of the front section of the screw, the adjusted rotation speed of the rear section of the screw, and the adjusted temperature W new to the control execution main module, and the control execution main module issues and executes relevant adjustment instructions to the execution device module; Among them, the adjustment instructions include the adjusted rotation speed LQ of the front section of the screw, the adjusted rotation speed LH of the rear section of the screw, and the adjusted temperature W. new ; The equipment used by the control execution main module includes a control system 2; The equipment used by the data acquisition module includes a flow sensor 4 and a temperature controller 6; The equipment used by the calculation control module includes the calculation equipment in the control system 2; The equipment used by the execution device module includes a heating system 5, a motor control system 3, and a feeding twin screw 34; Among them, the output end of the motor control system 3 is respectively connected to the front section and the rear section of the screw of the feeding twin screw 34; The motor control system performs a re-setting adjustment according to the results of the adjusted rotation speed LQ of the front section of the screw and the adjusted rotation speed LH of the rear section of the screw; The heating system performs a re-setting adjustment according to the result of the adjusted temperature W. new

[0021] ​In this embodiment, the adjusted rotational speed LQ of the front section of the screw, the adjusted rotational speed LH of the rear section of the screw, and the adjusted temperature W new Combined with the data acquisition module, the calculation control module, the execution device module, the control execution main module, and related devices, the dynamic adaptive control of the polystyrene particle extrusion process is realized. By collecting data in real time and calculating and adjusting the screw rotational speed and temperature according to the formula, it can adapt to changes in raw material characteristics and production environment, reduce product defects, indirectly improve product dimensional accuracy, qualification rate, and production stability, and transform post-event quality control into pre-event prevention; Specifically, the control system 2 first controls the feeding twin screws 34 connected to the motor control system 3 to respectively execute the initial rotational speed LQ0 of the front section of the screw and the initial rotational speed LH0 of the rear section of the screw, and uses the heating system 5 to perform the initial setting of the ideal temperature W0.

[0022] Subsequently, polystyrene particles are fed from the feed port of the extrusion device main body 1. During the feeding process, the flow sensor 4 senses and records the feeding speed in real time.

[0023] The resistance heating coil in the heating system 5 transfers heat to the extrusion device main body 1 through close contact with the inner wall of the extrusion device main body 1, thereby heating the polystyrene particles in the extrusion device main body 1. The feeding twin screws 34 stir and extrude the heated polystyrene particles. The sensing end of the temperature controller 6 senses the temperature in the extrusion device main body 1 in real time and transmits it to the control system 2.

[0024] The calculation device in the control system 2 calculates the current extrusion operation and outputs an adjustment instruction. Specifically, through the heating system 5 and the motor control system 3, the adjusted rotational speed LQ of the front section of the screw, the adjusted rotational speed LH of the rear section of the screw, and the adjusted temperature W new are adjusted in real time.

[0025] Refer to Figure 1 As shown, in this implementation scheme: the calculation control module obtains the first influence amount at the front end of the screw according to the first influence coefficient and the fluctuation of the feeding speed from the initial to the current; According to the difference between the current temperature and the ideal temperature, the temperature deviation characteristic is obtained, and the temperature deviation characteristic is multiplied by the second influence coefficient to obtain the second influence amount at the front end of the screw; Add the initial rotational speed of the front section of the screw, the first influence amount at the front end of the screw, and the second influence amount at the front end of the screw to obtain the adjusted rotational speed of the front section of the screw; The specific calculation process of the adjusted rotational speed of the front section of the screw is as follows: ; Among them: LQ is the adjusted rotational speed of the front section of the screw; LQ0 is the initial rotational speed of the front section of the screw, and LQ0 represents the rotational speed initially set for the front section of the screw during production; SB is the feed rate fluctuation value, and SB reflects the degree of difference between the current feed rate and the initial feed rate; Both t2 and t1 are influence coefficients; t1 reflects the adjustment amplitude required for the rotational speed of the front section of the screw when the feed rate fluctuation value SB changes by 1 kg / h; t2 reflects the temperature deviation The adjustment amplitude required for the rotational speed of the front section of the screw when deviating from 1 °C each; W is the current temperature; W0 is the ideal temperature, and W0 is preset according to the production process requirements of polystyrene particles.

[0026] In this embodiment, the initial rotational speed LQ0 of the front section of the screw is used as the base value for adjusting the rotational speed of the front section of the screw, representing the rotational speed initially set for the front section of the screw during production. It is a standard rotational speed preset according to the production process requirements and equipment characteristics, providing a stable benchmark for subsequent adjustments based on feed rate fluctuations and temperature deviations, enabling the rotational speed LQ of the front section of the screw after adjustment to accurately reflect the change of the actual situation relative to the initial state; The calculation part calculates the influence amount of the feed rate fluctuation on the rotational speed of the front section of the screw to ensure stable conveyance of the material when the feed rate changes. The two are multiplied to obtain the rotational speed amount that needs to be adjusted due to the feed rate fluctuation. When the feed rate changes, that is, in the cases of increasing and decreasing the feed rate, The calculation result of the calculation part will increase or decrease the initial rotational speed LQ0 of the front section of the screw, so that the rotational speed of the front section of the screw can be adjusted accordingly according to the change of the feed rate and maintain the stability of material conveyance; The calculation part calculates the influence amount of the temperature deviation on the rotational speed of the front section of the screw, and the influence of temperature on the fluidity of the material is considered to ensure normal material conveyance; Among them, represents the difference between the current temperature W and the ideal temperature W0, The calculation part multiplies to obtain the rotational speed amount that needs to be adjusted due to the temperature deviation. This is because temperature will affect the physical state of polystyrene particles and further affect the conveyance situation of the material in the screw. Specifically: Too high temperature will enhance the fluidity of the material. At this time, the result of the calculation part is negative, and thus the rotational speed of the front section of the screw is appropriately reduced. Too low temperature will make the fluidity of the material poor. At this time, the result of the calculation part is positive, and thus the rotational speed of the front section of the screw can be increased, thereby ensuring the stability of material conveyance and improving the stability of product quality, while The calculation results of the calculation part will be The calculated parts are added together so that the speed of the front section of the screw can be adjusted by comprehensively considering the temperature factor.

[0027] Reference Figure 1 As shown, in this embodiment: after receiving the adjusted screw front section speed, the calculation control module obtains the first influence amount of the screw rear end according to the third influence coefficient and the adjusted screw front section speed; According to the temperature deviation characteristics and the fourth influence coefficient, the second influence quantity of the rear end of the screw is obtained; The initial speed of the rear section of the screw, the first influence amount of the rear section of the screw, and the second influence amount of the rear section of the screw are calculated to obtain the speed of the rear section of the screw after adjustment; The specific calculation process of the rear section speed of the screw after adjustment is as follows: ; in: LH is the speed of the rear section of the screw after adjustment; LH0 is the initial speed of the rear section of the screw. LH0 indicates the speed of the rear section of the screw initially set during production; t3 and t4 are both influence coefficients; t3 reflects the influence of the change of the speed of the front section of the screw on the speed adjustment of the rear section of the screw; t4 reflects temperature deviation The degree of influence on the speed adjustment of the rear section of the screw.

[0028] In this embodiment, the initial speed LH0 of the rear section of the screw is used as the basic value for adjusting the speed of the rear section of the screw. It is the speed setting of the rear section of the screw in the initial state. Similar to the initial speed LQ0 of the front section of the screw, it is a standard speed predetermined according to the process and equipment requirements and is the starting point for subsequent adjustments. The calculation part calculates the influence of the screw front section speed adjustment on the screw rear section speed, so as to ensure the coordinated coordination of the front and rear section screw speeds, and ensure the extrusion pressure and product molding quality. The multiplication of the calculated parts gives the amount of adjustment required for the speed of the rear section due to the change in the speed of the front section. The speeds of the front and rear sections of the screw are interrelated. Adjustment of the speed of the front section will affect the transportation and distribution of the material, and thus affect the extrusion pressure and product molding of the rear section. The calculation results of the calculation part will be added to the initial speed LH0 of the rear section of the screw, so that the speed of the rear section can be coordinated and adjusted according to the changes in the speed of the front section; The calculation part calculates the influence of temperature deviation on the speed of the rear section of the screw, which takes into account the influence of temperature on the rheological properties of the material to ensure the extrusion pressure and product molding quality. It is worth noting that The calculation part takes the absolute value to eliminate the influence of the temperature deviation direction and only focuses on the magnitude of the deviation. This is because the rear section of the screw is mainly responsible for controlling the extrusion pressure and the quality of product formation. When the current temperature W deviates from the ideal temperature W0, whether it is too high or too low, it will affect the rheological properties of the material, and further affect the extrusion pressure and product formation. Specifically, too high a temperature will make the material too thin, resulting in insufficient extrusion pressure, and too low a temperature will make the material too viscous, increasing the extrusion resistance. Using the absolute value can uniformly measure the magnitude of the temperature deviation, and the square root operation is to appropriately "compress" the large temperature deviation to avoid excessive adjustment of the rotation speed of the rear section of the screw when the temperature deviation is too large. In this way, temperature has an important influence on the extrusion process of the material in the rear section of the screw, so the calculation result of the calculation part will be added to the calculation part, so that the rotation speed of the rear section can be adjusted by comprehensively considering the temperature factor to ensure the extrusion pressure and the quality of product formation.

[0029] Refer to Figure 1 As shown, in this implementation scheme: after receiving the adjusted rotation speed of the front section of the screw and the adjusted rotation speed of the rear section of the screw, the calculation control module obtains the first temperature influence amount according to the adjusted rotation speed of the front section of the screw, the adjusted rotation speed of the rear section of the screw, and the fifth influence coefficient; obtains the second temperature influence amount according to the fluctuation of the feeding speed from the initial to the current and the sixth influence coefficient; obtains the adjusted temperature by using the current temperature, the first temperature influence amount, and the second temperature influence amount; The specific calculation process of the adjusted temperature is as follows: ; Among them: W new is the adjusted temperature; Both t5 and t6 are influence coefficients; t5 reflects the amplitude of temperature adjustment required when the rotation speed LH of the rear section of the adjusted screw changes by 1 r / min; t6 reflects the amplitude of temperature adjustment required when the feeding speed fluctuation value SB changes by 1 kg / h.

[0030] In this embodiment, the current temperature W is used as the basic value for temperature adjustment, representing the current actual temperature, which is obtained by real-time measurement by a temperature sensor installed in the heating zone and is the starting point for subsequent temperature adjustment; The calculation part calculates the influence amount of the change in the rotation speed of the rear section of the screw on the temperature. Considering the influence of the rotation speed of the rear section of the screw on the heat generation and heat dissipation of the material, the temperature is adjusted to ensure process stability. Among them, the calculation part represents the change amount of the rotation speed of the rear section of the screw, By multiplying the calculation part, the temperature adjustment amount required due to the change in the rotational speed of the rear section is obtained. During the production process of the extrusion process, the change in the rotational speed of the rear section of the screw will affect the residence time and shear force of the material in the screw, thereby affecting the heat generation and heat dissipation of the material. The calculation result held by the calculation part will be added to the current temperature W, enabling the temperature to be adjusted according to the change in the rotational speed of the rear section. The calculation part calculates the influence amount of the feed speed fluctuation on the temperature. Considering the influence of the feed speed on the heating and mixing process of the material in the screw, the temperature is adjusted to ensure the process effect, and thus the temperature adjustment amount required due to the feed speed fluctuation is obtained. Among them, the change in the feed speed will affect the filling situation and residence time of the material in the screw, and further affect the heating and mixing effect of the material. The calculation result of the calculation part will be added to the calculation part, enabling the temperature to be adjusted by comprehensively considering the feed speed factor. In addition, it should be noted that the adjusted temperature W obtained by calculation new will be used as the new current temperature W in the next calculation and substituted into , , for calculation in sequence, so that the entire extrusion process forms a closed-loop control system. And during the production process, the feed speed, screw rotational speed, and temperature parameters affect and restrict each other, and enable the system to continuously make dynamic adjustments according to the real-time production situation. As the production process progresses, the algorithm can adaptively adjust the screw rotational speed and temperature.

[0031] Referring to Figure 1 as shown, in this implementation: 6. Before the calculation control module performs calculation and adjustment, the experimental influence coefficients including the feed speed, temperature, rotational speed of the front section of the screw, and rotational speed of the rear section of the screw are gradually increased, and the experimental data is observed and recorded during the experiment. The experimental data is combined with statistical analysis and machine learning methods to determine, specifically as follows: The first influence coefficient: Gradually increase the feed speed, record the change in the rotational speed of the front section of the screw when the feed speed changes by 1 kg / h each time, and use the statistical method of linear regression to obtain the first influence coefficient. The second influence coefficient: Gradually increase the temperature, record the change in the rotational speed of the front section of the screw when the temperature deviates from the set value by 1 °C each time, and obtain the second influence coefficient. The third influence coefficient: Gradually increase the rotational speed of the front section of the screw, record the influence degree on the rotational speed of the rear section of the screw, and obtain the third influence coefficient. The fourth influence coefficient: Gradually increase the temperature, record the influence of the temperature deviation on the rotational speed of the rear section of the screw, and obtain the fourth influence coefficient. The fifth influence coefficient: Gradually increase the rotational speed of the rear section of the screw, record its influence on the temperature, and obtain the fifth influence coefficient; The sixth influence coefficient: Gradually increase the feeding speed, record its influence on the temperature, and obtain the sixth influence coefficient; Among them, the gradual increase specifically includes increasing the speed based on the initial setting commands of the feeding speed, the rotational speed of the front section of the screw, and the rotational speed of the rear section of the screw, as well as increasing the temperature based on the initial setting command of the temperature.

[0032] In this embodiment, for the first influence coefficient t1, the second influence coefficient t2, the third influence coefficient t3, the fifth influence coefficient t5, and the sixth influence coefficient t6 that present a linear relationship, the least squares method can be used for linear regression analysis to determine. Since in the calculation of the adjusted rotational speed LH of the rear section of the screw, the influence of the temperature deviation on the rotational speed of the rear section of the screw adopts a non-linear form, the fourth influence coefficient t4 can be determined by using a non-linear regression method for adjustment; After determining the second influence coefficient t2, the rotational speed of the front section of the screw can be accurately adjusted according to the temperature deviation. When the current temperature W deviates from the ideal temperature W0, the rotational speed of the front section of the screw can be changed in a timely manner to adapt to the change in the fluidity of the material, ensuring stable material transportation and reducing product defects caused by temperature fluctuations. After determining the fifth influence coefficient t5 and the sixth influence coefficient t6, the influence of the change in the rotational speed of the rear section of the screw and the fluctuation of the feeding speed on the temperature can be comprehensively considered, and the temperature can be dynamically adjusted according to the actual production situation to achieve a more optimized temperature control strategy; After determining the first influence coefficient t1, the rotational speed of the front section of the screw can be accurately adjusted according to the fluctuation of the feeding speed. After determining the third influence coefficient t3 and the fourth influence coefficient t4, the rotational speed of the rear section of the screw can be adjusted synergistically, considering the influence of the change in the rotational speed of the front section of the screw and the temperature deviation on the rotational speed of the rear section, to achieve more refined material transportation and extrusion control; In summary, by accurately determining these coefficients, the entire extrusion process forms a tight closed-loop control system. The adjusted rotational speed LQ of the front section of the screw, the adjusted rotational speed LH of the rear section of the screw, and the adjusted temperature W new are interrelated and dynamically adjusted according to the real-time collected data, which can timely correct the quality deviation in the production process and transform the passive post-quality control into active pre-prevention.

[0033] It should be noted that any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall also be within the protection scope of the present invention.

Claims

1. A polystyrene particle extrusion process, comprising an extrusion device body (1), characterized in that: The extrusion device body (1) is respectively connected to a control execution main module, a data acquisition module, a calculation control module and an execution equipment module; The control execution main module is used to issue and execute the initial setting instructions including the initial speed of the front section of the screw, the ideal temperature, and the initial speed of the rear section of the screw to the execution device module; The data acquisition module is used to collect the current feed speed and current temperature in real time; The calculation control module is used to receive the transmission of the initial setting instruction, the current feed speed, and the current temperature, and observe and record experimental data in the experiment to obtain the influence coefficient characteristics; The influence coefficient characteristics include a first influence coefficient, a second influence coefficient, a third influence coefficient, a fourth influence coefficient, a fifth influence coefficient, and a sixth influence coefficient; According to the initial setting instruction, the first influence coefficient, and the second influence coefficient, obtaining the adjusted front-stage speed of the screw; According to the adjusted screw front section speed, the third influence coefficient, and the fourth influence coefficient, the adjusted screw rear section speed is obtained; According to the adjusted screw rear section speed, the fifth influence coefficient, and the sixth influence coefficient, the adjusted temperature W is obtained. new ; The calculation control module is used to adjust the screw front section speed after adjustment, the screw rear section speed after adjustment, and the temperature W after adjustment. new The control execution main module transmits the information to the control execution main module, and the control execution main module issues and executes the relevant adjustment instructions to the execution device module; The adjustment instructions include adjusting the speed of the front section of the screw, adjusting the speed of the rear section of the screw, and adjusting the temperature.

2. A polystyrene particle extrusion process according to claim 1, characterized in that: The equipment used by the control execution main module includes a control system (2); The equipment used in the data acquisition module includes a flow sensor (4) and a temperature controller (6); The equipment used by the computing control module includes computing equipment in the control system (2); The equipment used in the execution equipment module includes a heating system (5), a motor control system (3), and a feeding twin screw (34); The output ends of the motor control system (3) are respectively connected to the front section and the rear section of the feeding twin screw (34).

3. A polystyrene particle extrusion process according to claim 2, characterized in that: Based on the calculation control module, according to the first influence coefficient and the fluctuation of the initial to current feeding speed, a first influence amount of the front end of the screw is obtained; According to the difference between the current temperature and the ideal temperature, a temperature deviation characteristic is obtained, and the temperature deviation characteristic is multiplied by the second influence coefficient to obtain a second influence amount of the front end of the screw; The initial rotation speed of the front section of the screw, the first influence amount of the front end of the screw, and the second influence amount of the front end of the screw are added together to obtain the rotation speed of the front section of the screw after adjustment.

4. A polystyrene particle extrusion process according to claim 3, characterized in that: After the calculation control module receives the adjusted screw front section speed, the first influence amount of the screw rear end is obtained according to the third influence coefficient and the adjusted screw front section speed; According to the temperature deviation characteristic and the fourth influence coefficient, a second influence amount of the rear end of the screw is obtained; The initial rotation speed of the rear section of the screw, the first influence amount of the rear end of the screw, and the second influence amount of the rear end of the screw are calculated to obtain the rotation speed of the rear section of the screw after adjustment.

5. A polystyrene particle extrusion process according to claim 4, characterized in that: After the calculation control module receives the adjusted screw front section speed and the adjusted screw rear section speed, the first temperature influence amount is obtained according to the adjusted screw front section speed, the adjusted screw rear section speed and the fifth influence coefficient; Obtaining a second temperature influence amount according to the fluctuation of the feed rate from the initial to the current feed rate and the sixth influence coefficient; The current temperature, the first temperature influence amount, and the second temperature influence amount are used to obtain the adjusted temperature.

6. A polystyrene particle extrusion process according to claim 5, characterized in that: Before the calculation and adjustment, the calculation control module gradually increases the influencing coefficient characteristics including feed rate, temperature, screw front section speed and screw rear section speed, and observes and records the experimental data in the experiment, and determines it through the experimental data combined with statistical analysis and machine learning methods, as follows: The first influence coefficient: gradually increase the feed rate, record the change in the screw front section speed when the feed rate changes by 1 kg / h, and use a linear regression statistical method to obtain the first influence coefficient; The second influence coefficient: gradually increase the temperature, record the change in the speed of the front section of the screw when the temperature deviates from the set value by 1°C, and obtain the second influence coefficient; The third influence coefficient: gradually increase the speed of the front section of the screw, record the influence of the speed on the rear section of the screw, and obtain the third influence coefficient; The fourth influence coefficient: gradually increase the temperature, record the influence of temperature deviation on the speed of the rear section of the screw, and obtain the fourth influence coefficient; The fifth influence coefficient: gradually increase the speed of the rear section of the screw, record its influence on the temperature, and obtain the fifth influence coefficient; The sixth influence coefficient: gradually increase the feed rate, record its influence on the temperature, and obtain the sixth influence coefficient; The gradual increase specifically includes increasing the speed based on the initial setting instructions of the feed speed, the rotation speed of the front section of the screw and the rotation speed of the rear section of the screw, and increasing the temperature based on the initial setting instructions of the temperature.

7. A polystyrene particle extrusion process according to claim 5, characterized in that: The motor control system is reset and adjusted according to the results of the adjusted front-end speed of the screw and the adjusted rear-end speed of the screw.

8. A polystyrene particle extrusion process according to claim 7, characterized in that: The heating system is reset and adjusted according to the result of the adjusted temperature.

Images