Temperature feedback control system for precise cable sheath extrusion process

Abstract

The invention provides a temperature feedback control system for a precise cable sheath extrusion process, relates to the technical field of temperature feedback control, and determines a temperature variation sequence when extrusion equipment operates in a closed water circulation mode. According to the temperature variation sequence and all the dynamic temperature information, determining a temperature adjustment delay trend of the temperature of the extrusion charging barrel in response to the change of the wire diameter, and performing parallel compensation on an operation guide temperature fed back in an external runner of the charging barrel when the sheath is extruded according to the temperature adjustment delay trend; according to the temperature conversion attribute and all the temperature control adaptation deviations, determining a standing temperature circulation rule when the temperature of the extrusion charging barrel is matched with temperature adjusting medium circulation, and carrying out credible identification on a temperature correction strategy when the extrusion temperature is fed back and corrected; and performing cooperative interaction control on the extrusion temperature according to the operation guidance temperature after parallel compensation and the temperature correction strategy after credible identification. According to the invention, collaborative optimization can be carried out on temperature control elements under a complex extrusion working condition, so that the processing precision of the precise cable sheath is improved.

Description

Technical Field

[0001] The present application relates to the technical field of temperature feedback control, and more specifically, to a temperature feedback control system for a precision cable sheath extrusion process. Background Art

[0002] Temperature feedback control involves real-time monitoring of the actual temperature in each barrel temperature zone during the precision cable sheath extrusion process, comparing and analyzing it with the set temperature to obtain temperature deviation information. Based on the deviation size and trend, the operating parameters of the heating or cooling system are dynamically adjusted to achieve precise control of the extrusion temperature. This control mechanism can promptly respond to temperature fluctuations during the extrusion process, such as those caused by changes in raw material characteristics and equipment operating status. Through continuous feedback and correction, it ensures that the barrel temperature remains stable within the process requirements, thereby ensuring key indicators such as the dimensional accuracy and mechanical properties of the cable sheath and improving product quality consistency.

[0003] However, the existing temperature feedback control for precision cable sheath extrusion fails to effectively integrate dynamic temperature fluctuations and process range adaptation deviations. It also lacks precise quantification of the temperature variation dynamic sequence under closed-circuit water circulation and the temperature control hysteresis trend caused by wire diameter changes. Furthermore, the temperature control strategy fails to integrate the heat conversion properties of the electronic control mode with the temperature control medium circulation rules for reliable verification. This results in response lag, insufficient compensation, and low strategy reliability in temperature control, leading to poor extrusion temperature stability, large fluctuations in sheath dimensional accuracy and mechanical properties, and thus affecting product quality consistency. Therefore, how to collaboratively optimize temperature control factors under complex extrusion conditions to improve the processing accuracy of precision cable sheaths is a challenge facing the industry. Summary of the Invention

[0004] The present application provides a temperature feedback control system for the precision cable sheath extrusion process, which can collaboratively optimize temperature control factors under complex extrusion conditions to improve the processing accuracy of the precision cable sheath.

[0005] In a first aspect, the present application provides a temperature feedback control system for a precision cable sheath extrusion process, the temperature feedback control system comprising: The temperature acquisition module is used to obtain the dynamic temperature information of each heating zone and the temperature control adaptation deviation within each extrusion process interval when the extrusion equipment extrudes the precision cable sheath under the same extrusion process conditions; A parallel compensation module is used to determine the temperature variation fluctuation sequence of the extrusion equipment when operating in a closed-circuit water circulation mode, and determine the temperature adjustment hysteresis trend of the extrusion barrel temperature in response to the change in wire diameter based on the temperature variation fluctuation sequence and all dynamic temperature information. The temperature adjustment hysteresis trend is then used to perform parallel compensation for the operating guide temperature fed back from the barrel external flow channel during sheath extrusion; A trusted identification module is used to detect in real time the temperature conversion properties of the extrusion equipment when performing heat conversion by setting the temperature in the electronic control mode. Based on the temperature conversion properties and all temperature control adaptation deviations, the temperature stationary cycle rule of the extrusion barrel temperature when matching the temperature control medium circulation is determined. The temperature stationary cycle rule is then used to trust the temperature correction strategy during the extrusion temperature feedback correction. The feedback control module is used to collaboratively and interactively control the extrusion temperature based on the operating guidance temperature after parallel compensation and the temperature correction strategy after credible identification.

[0006] In this embodiment, the temperature control adaptation deviation refers to the difference between the actual temperature and the set temperature of the extrusion equipment in different extrusion process intervals.

[0007] In this embodiment, the dynamic temperature information refers to the temperature data of each heating zone of the extrusion equipment that changes continuously over time during the extrusion process.

[0008] In this embodiment, determining the temperature variation sequence when the extrusion equipment operates in a closed-circuit water circulation mode specifically includes: Determine static temperature deviations when extrusion equipment is operating in closed-loop water circulation mode; Determining the adjacent temperature gradient when the operating temperature changes by using the static temperature deviation; A temperature variation fluctuation sequence is determined based on the adjacent temperature gradient when the extrusion equipment is operated in a closed-circuit water circulation mode.

[0009] In this embodiment, the response to the change in wire diameter refers to the process in which the extrusion equipment senses the change in cable diameter and adjusts the barrel temperature to adapt to the new wire diameter processing requirements.

[0010] In this embodiment, the parallel compensation of the operating guide temperature fed back in the flow channel outside the barrel during the extrusion of the sheath by the temperature adjustment hysteresis trend specifically includes: Determining the thermal inertia compensation margin of the external flow channel of the barrel according to the temperature adjustment hysteresis trend; Obtain the operating guidance temperature fed back from the flow channel outside the barrel during sheath extrusion; The thermal inertia compensation margin is dynamically allocated to the operating guide temperature to obtain the operating guide temperature after parallel compensation.

[0011] In this embodiment, the real-time detection of the temperature conversion properties of the extrusion device when performing heat conversion by setting the temperature in the electronic control mode specifically includes: Real-time collection of temperature fluctuation indicators of the extrusion equipment barrel under electronic control mode; Determine the temperature response sequence when heat is converted through set temperatures in the historical operating data of the extrusion equipment; The temperature conversion property of the extrusion device when performing heat conversion by setting the temperature in the electronic control mode is determined according to the temperature fluctuation index and the temperature response sequence.

[0012] In this embodiment, the closed-circuit water circulation mode refers to an operating mode in which water circulates between the extrusion equipment and the temperature control device through a pipeline.

[0013] In this embodiment, the temperature regulating medium circulation refers to a cyclic process in which the temperature regulating medium flows through the pipes in each temperature zone of the barrel, and the temperature of each temperature zone is regulated through heat exchange.

[0014] In this embodiment, the collaborative interactive control of the extrusion temperature based on the operating guide temperature after parallel compensation and the temperature correction strategy after trustworthy identification specifically includes: Determine the dynamic interaction entropy in cooperative interactive control based on the operating guidance temperature after parallel compensation and the temperature correction strategy after credible identification; Generate collaborative feedback weights of temperature control instructions through the dynamic interaction entropy; The final execution temperature of the cooperative interactive control of the extrusion temperature is determined by the cooperative feedback weight.

[0015] The technical solutions provided by the embodiments disclosed in this application have the following beneficial effects: By obtaining the dynamic temperature information of each heating zone and the temperature control adaptation deviation within each extrusion process interval when the extrusion equipment extrudes precision cable sheaths under the same extrusion process conditions; determining the temperature variation fluctuation sequence of the extrusion equipment when operating in a closed-circuit water circulation mode, determining the temperature adjustment hysteresis trend of the extrusion barrel temperature in response to wire diameter changes based on the temperature variation fluctuation sequence and all dynamic temperature information, and then using the temperature adjustment hysteresis trend to perform parallel compensation for the operating guide temperature fed back in the barrel external flow channel during sheath extrusion; real-time detection of the temperature conversion properties of the extrusion equipment when performing heat conversion by setting the temperature in the electronic control mode, determining the stationary temperature cycle rules of the extrusion barrel temperature when matching the temperature control medium circulation based on the temperature conversion properties and all temperature control adaptation deviations, and then using the stationary temperature cycle rules to perform credible identification of the temperature correction strategy during extrusion temperature feedback correction; and collaborative interactive control of the extrusion temperature based on the parallel-compensated operating guide temperature and the credibly identified temperature correction strategy.

[0016] It can be seen from this that in the present application, precise coordinated control of temperature can be achieved during the extrusion process of precision cable sheathing; among them, by obtaining the dynamic temperature information of each heating zone of the extrusion equipment under the same process conditions and the temperature control adaptation deviation of each process interval, it is possible to fully capture the dynamic temperature changes and process adaptation differences, provide a complete data basis for subsequent temperature control, and effectively improve the perception of complex extrusion conditions; by determining the temperature variation fluctuation sequence under the closed-circuit water circulation mode, analyzing the temperature adjustment hysteresis trend and performing parallel compensation for the operating guide temperature, it is possible to offset the influence of temperature variation hysteresis in advance, so that the temperature response and wire diameter change are accurately matched, significantly improving the timeliness and foresight of temperature control; by detecting the temperature conversion properties under the electronic control mode, determining the temperature stationary cycle rules and reliably identifying the temperature correction strategy, it is possible to ensure the reliability of the temperature control medium circulation and correction strategy, avoid invalid or conflicting temperature adjustments, and enhance the stability of temperature control and the effectiveness of the strategy; by performing collaborative interactive control based on the operating guide temperature after parallel compensation and the temperature correction strategy after reliably identified, it is possible to achieve dynamic and precise temperature regulation, greatly improving the dimensional accuracy and product quality consistency of the precision cable sheath.

[0017] In summary, the technical solution adopted in this application can collaboratively optimize the temperature control factors under complex extrusion conditions to improve the processing accuracy of precision cable sheaths. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 This is a module structure diagram of a temperature feedback control system for a precision cable sheath extrusion process provided by the present application; Figure 2 It is a schematic diagram of a process for determining the temperature adjustment hysteresis trend provided by the present application; Figure 3 It is a flow chart of determining the temperature-maintaining cycle rules provided in this application. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0021] The embodiment of the present application provides a temperature feedback control system for the precision cable sheath extrusion process, the core of which is to obtain the dynamic temperature information of each heating zone and the temperature control adaptation deviation within each extrusion process interval when the extrusion equipment extrudes the precision cable sheath under the same extrusion process conditions; determine the temperature variation fluctuation sequence of the extrusion equipment when operating in a closed-circuit water circulation mode, and determine the temperature adjustment hysteresis trend of the extrusion barrel temperature in response to the wire diameter change based on the temperature variation fluctuation sequence and all the dynamic temperature information, and then use the temperature adjustment hysteresis trend to perform parallel compensation for the operating guide temperature fed back in the external flow channel of the barrel during sheath extrusion; real-time detection of the temperature conversion properties of the extrusion equipment when performing heat conversion by setting the temperature in the electronic control mode, and determine the temperature stationary cycle rules of the extrusion barrel temperature when matching the temperature control medium circulation based on the temperature conversion properties and all the temperature control adaptation deviations, and then use the temperature stationary cycle rules to perform credible identification of the temperature correction strategy during the extrusion temperature feedback correction; and collaboratively and interactively control the extrusion temperature based on the parallel-compensated operating guide temperature and the credibly identified temperature correction strategy.

[0022] In order to better understand the above technical solution, the following will be described in detail with reference to the accompanying drawings and specific implementation methods. Figure 1 As shown in the figure, this figure is a module structure diagram of a temperature feedback control system for a precision cable sheath extrusion process according to this embodiment of the present application. The temperature feedback control system includes: a temperature acquisition module 100, a parallel compensation module 200, a trustworthy identification module 300 and a feedback control module 400, which are described as follows: The temperature acquisition module 100 is used to obtain the dynamic temperature information of each heating zone and the temperature control adaptation deviation in each extrusion process interval when the extrusion equipment extrudes the precision cable sheath under the same extrusion process conditions.

[0023] To obtain dynamic temperature information for each heating zone of an extruder extruding precision cable sheath under the same extrusion process conditions, the following method can be used: Platinum resistance temperature sensors with an accuracy of ±0.1°C are installed on the surfaces of the extruder's heating zones, including the feed zone, melting zone, homogenizing zone, and die head. These sensors are connected to a data acquisition system via shielded cables. The data acquisition system's sampling frequency is set to 10 times per second to ensure that subtle temperature changes are captured. Maintaining stable extrusion process conditions (i.e., a fixed screw speed of 50 rpm, a feed rate of 20 kg / h, and set temperatures for each heating zone (e.g., 150°C for the feed zone and 200°C for the melting zone), the equipment is started to extrude the precision cable sheath. Temperature data is collected continuously for three hours. The data acquisition system automatically stores the data in CSV format. After importing the data into a computer, data analysis software is used to generate temperature-time curves for each heating zone, representing the dynamic temperature information.

[0024] It should be noted that, in this application, dynamic temperature information refers to the temperature data of each heating zone of the extrusion equipment that changes continuously over time during the extrusion process.

[0025] In addition, in specific implementation, the temperature control adaptation deviation within each extrusion process range can be obtained by the following method: divide the extrusion process range, such as dividing it into three ranges according to cable diameter: 1mm-2mm, 2mm-3mm, and 3mm-4mm. In each range, the actual temperature data is collected and the set temperature of the corresponding range is recorded. For each set of temperature data in each range, the set temperature is subtracted from the actual temperature to obtain the instantaneous deviation. The average, maximum value, and standard deviation of all instantaneous deviations within the range are then calculated, and the calculated results are used as the temperature control adaptation deviation within the extrusion process range.

[0026] It should be noted that, in this application, the temperature control adaptation deviation refers to the difference between the actual temperature of the extrusion equipment and the set temperature within different extrusion process ranges.

[0027] The parallel compensation module 200 is used to determine the temperature variation fluctuation sequence when the extrusion equipment is operating in a closed-circuit water circulation mode, and determine the temperature adjustment hysteresis trend of the extrusion barrel temperature in response to the change in wire diameter based on the temperature variation fluctuation sequence and all dynamic temperature information. Then, the temperature adjustment hysteresis trend is used to perform parallel compensation for the operating guide temperature fed back in the external flow channel of the barrel during the extrusion of the sheath.

[0028] In this embodiment, the temperature variation sequence of the extrusion equipment when operating in the closed-circuit water circulation mode can be determined in the following manner, namely: Determine static temperature deviations when extrusion equipment is operating in closed-loop water circulation mode; Determining the adjacent temperature gradient when the operating temperature changes by using the static temperature deviation; A temperature variation fluctuation sequence is determined based on the adjacent temperature gradient when the extrusion equipment is operated in a closed-circuit water circulation mode.

[0029] In specific implementation, first, set the closed-circuit water circulation system parameters of the extrusion equipment to fixed values, such as setting the circulating water temperature to 45°C and the water flow rate to 1.5L / min. At the same time, fix the set temperature of each heating zone of the extrusion equipment (such as 160°C in the feeding zone, 210°C in the melting zone, 200°C in the homogenizing zone, and 190°C in the die head zone); install high-precision temperature sensors at key positions of the equipment, and the measurement accuracy of the sensors must reach ±0.1°C. Start the equipment and keep it running in closed-circuit water circulation mode. Record the actual temperature of each monitoring point every 1 minute for 30 consecutive times. For each monitoring point, subtract the corresponding set temperature from the actual temperature recorded each time to obtain 30 instantaneous deviation values. Then calculate the average of the 30 instantaneous deviation values. This average value is the static temperature deviation when running in closed-circuit water circulation mode. Then, determine the position distribution of each monitoring point, identify adjacent monitoring points (such as the feeding section is adjacent to the melting section, the melting section is adjacent to the homogenizing section, and the homogenizing section is adjacent to the head section), calculate the actual temperature difference between the two adjacent monitoring points, and then measure the straight-line distance between the two monitoring points. Divide the actual temperature difference between the adjacent monitoring points by the distance between the two points. The result is the adjacent temperature gradient between the two adjacent monitoring points, that is, the adjacent temperature gradient when the operating temperature changes; finally, each monitoring point records the actual temperature value every 10 seconds to form a time-temperature data group for each monitoring point. The time-temperature data of each monitoring point are arranged in chronological order, and the temperature change characteristics related to the adjacent temperature gradient are marked to form a complete temperature variation fluctuation sequence, that is, the temperature variation fluctuation sequence of the extrusion equipment when operating in closed-circuit water circulation mode is obtained.

[0030] It should be noted that, in this application, the closed-circuit water circulation mode refers to an operating mode in which water is circulated between the extrusion equipment and the temperature control device through a pipe to achieve heat exchange to regulate the temperature of the equipment, and the water is not directly connected to the outside world; the static temperature deviation refers to the difference between the actual temperature and the set temperature of each monitoring point when the extrusion equipment is stably operating in the closed-circuit water circulation mode; the adjacent temperature gradient refers to the temperature change rate between two adjacent monitoring points during the operation of the extrusion equipment; the temperature variation sequence refers to an ordered data set of the continuous change of the temperature of each monitoring point over time when the extrusion equipment is operating in the closed-circuit water circulation mode.

[0031] Preferably, in this embodiment, the temperature adjustment hysteresis trend of the extrusion barrel temperature in response to the wire diameter change is determined according to the temperature variation sequence and all dynamic temperature information, referring to Figure 2 As shown in FIG, this figure is a flow chart of determining the temperature adjustment hysteresis trend in some embodiments of the present application. In this embodiment, determining the temperature adjustment hysteresis trend can be achieved by using the following steps: In step S21, the temperature response characteristics of the extrusion barrel under dynamic conditions are determined through the temperature variation dynamic sequence; In step S22, the temperature transfer boundary in response to the wire diameter change is extracted from all dynamic temperature information; In step S23, the temperature adjustment hysteresis gap of the extrusion barrel temperature in response to the change in wire diameter is determined; In step S24, the temperature adjustment hysteresis trend of the extrusion barrel temperature in response to the wire diameter change is determined based on the temperature response characteristics, the temperature transfer boundary, and the temperature adjustment hysteresis gap.

[0032] In its implementation, the researchers first extracted four consecutive hours of barrel temperature data from the temperature variation sequence and organized it chronologically into a time-temperature dataset. The cable diameter was artificially changed at various time points (e.g., from 2mm to 3mm, and from 3mm to 2.5mm), and the moments of diameter change were recorded. For each diameter change, the temperature data before and after the change were captured. The average rate of temperature increase from the initial value to the new stable value, the time required to reach the stable value, and the temperature fluctuation amplitude were calculated. These calculated data were used as the temperature response characteristics of the extruder barrel under dynamic conditions. Next, the temperature data segments containing the diameter change process were selected from all dynamic temperature information. The temperature data for each heating zone was analyzed, and the stable temperature values ​​before and after the diameter change were marked. The temperature critical values ​​between adjacent heating zones were then determined: at the boundary between the feed zone and the melt zone, the critical temperature before the diameter change was 165°C and after the diameter change, due to heat transfer requirements, the critical temperature became 170°C. These two values ​​constituted the temperature transfer boundary at this boundary in response to the diameter change. Then, a wire diameter detection device records the moment of wire diameter change in real time, accurate to the second. The barrel temperature data is extracted from the dynamic temperature information, and the moment when the temperature begins to deviate from its original stable value is determined. The difference between the two moments is calculated, which represents the temperature hysteresis gap of the extrusion barrel temperature in response to the wire diameter change. Finally, a three-dimensional analysis model is established, with the horizontal axis representing the heating rate in the temperature response characteristic, the vertical axis representing the critical temperature of the temperature transfer boundary, and the third axis representing the temperature hysteresis gap. The temperature response characteristic, temperature transfer boundary, and temperature hysteresis gap are input into the model, and the data distribution pattern is analyzed. For example, when the heating rate is increased to 1.5°C / min and the critical temperature rises to 175°C, the hysteresis gap shortens to 3 seconds. When the heating rate is reduced to 0.8°C / min and the critical temperature drops to 165°C, the hysteresis gap lengthens to 7 seconds, forming an overall trend of "faster heating rate, higher critical temperature, shorter hysteresis gap". This overall trend is used as the temperature hysteresis trend of the extrusion barrel temperature in response to wire diameter changes.

[0033] It should be noted that, in this application, responding to wire diameter changes refers to the process in which the extrusion equipment senses the change in cable diameter and adjusts the barrel temperature to adapt to the new wire diameter processing requirements; the temperature response characteristic refers to the law of temperature changes of the extrusion barrel under dynamic working conditions as the wire diameter changes and the water circulation parameters are adjusted; the temperature transfer boundary refers to the critical temperature value of different areas of the barrel when responding to wire diameter changes; the temperature adjustment hysteresis gap refers to the time difference between the moment when the wire diameter begins to change and the moment when the barrel temperature begins to respond to the change; the temperature adjustment hysteresis trend refers to the overall change trend of the extrusion barrel temperature when it exhibits hysteresis when responding to wire diameter changes.

[0034] In this embodiment, the parallel compensation of the operating guide temperature fed back in the flow channel outside the barrel during the extrusion of the sheath by the temperature adjustment hysteresis trend can be specifically achieved by the following steps, namely: Determining the thermal inertia compensation margin of the external flow channel of the barrel according to the temperature adjustment hysteresis trend; Obtain the operating guidance temperature fed back from the flow channel outside the barrel during sheath extrusion; The thermal inertia compensation margin is dynamically allocated to the operating guide temperature to obtain the operating guide temperature after parallel compensation.

[0035] To implement this, the thermal inertia parameters of the barrel's external flow channel are first measured. Experiments can be conducted to obtain data such as the specific heat capacity, mass, and surface area of ​​the flow channel material. The heat capacity of the flow channel is calculated (heat capacity = specific heat capacity × mass), and the heat dissipation rate is recorded at different ambient temperatures. The thermal inertia compensation margin can be calculated using the following formula: Thermal inertia compensation margin = required temperature rise value - natural temperature rise value during the hysteresis period. If heat dissipation occurs, an additional heat dissipation loss must be added, which is the product of the unit time and the absolute value of the temperature change per unit time. Platinum resistance temperature sensors with an accuracy of ±0.1°C are then installed at the inlet, middle, and outlet sections of the barrel's external flow channel. The sensor probes are in close contact with the inner wall of the flow channel. The sampling frequency is set to 10 times per second. Outliers are first removed, and then a weighted average algorithm is used to calculate the weighted average value, which serves as the operating guide temperature feedback from the barrel's external flow channel during sheath extrusion. Finally, a wire diameter detector measures the wire diameter change rate in real time, simultaneously calculating the deviation between the actual flow channel temperature and the operating guide temperature. A set rule is established: when the wire diameter changes rapidly and the actual temperature is below the guide temperature, a 100% thermal inertia compensation margin is added to the guide temperature; when the wire diameter changes slowly and the actual temperature is close to the guide temperature, a 50% thermal inertia compensation margin is added; and when the wire diameter remains unchanged, a 0% thermal inertia compensation margin is added. The control system performs dynamic allocation in real time: reading the wire diameter change rate and temperature deviation every 50 milliseconds, and calculating the current thermal inertia compensation margin to be added based on the set rule. The formula is: Operating guide temperature after parallel compensation = Operating guide temperature + (Thermal inertia compensation margin × Allocation ratio). The compensated temperature command is sent to the flow channel's heating and cooling devices, driving the actuator to adjust power or flow in real time to achieve temperature control.

[0036] It should be noted that, in this application, the external flow channel of the barrel refers to a pipeline arranged around the barrel of the extruder for circulating the temperature-regulating medium to regulate the temperature of the barrel; the operating guide temperature refers to the target temperature value of the external flow channel of the barrel used to guide the flow channel temperature control during the sheath extrusion process; the thermal inertia compensation margin refers to the pre-set temperature compensation amount to offset the temperature response delay caused by the thermal inertia of the external flow channel of the barrel; parallel compensation refers to the addition of an additional compensation amount to the operating guide temperature outside the original temperature control loop, and the synchronization with the original control to offset the hysteresis; dynamic allocation refers to adjusting the proportion of the thermal inertia compensation margin added to the operating guide temperature according to the real-time extrusion conditions. The operating guide temperature after parallel compensation refers to the new target temperature formed by adding the thermal inertia compensation margin to the original operating guide temperature according to the dynamic allocation rules.

[0037] The trusted identification module 300 is used to detect in real time the temperature conversion properties of the extrusion equipment when performing heat conversion by setting the temperature in the electronic control mode, and determine the temperature stationary cycle rules of the extrusion barrel temperature when matching the temperature control medium circulation based on the temperature conversion properties and all temperature control adaptation deviations. The temperature correction strategy during the extrusion temperature feedback correction is then trustedly identified based on the temperature stationary cycle rules.

[0038] In this embodiment, the real-time detection of the temperature conversion property of the extrusion device when performing heat conversion by setting the temperature in the electronic control mode can be specifically achieved by the following steps, namely: Real-time collection of temperature fluctuation indicators of the extrusion equipment barrel under electronic control mode; Determine the temperature response sequence when heat is converted through set temperatures in the historical operating data of the extrusion equipment; The temperature conversion property of the extrusion device when performing heat conversion by setting the temperature in the electronic control mode is determined according to the temperature fluctuation index and the temperature response sequence.

[0039] In the specific implementation, first, install a thermocouple temperature sensor in the feeding area, melting area, homogenization area and head area of ​​the extrusion equipment barrel, and connect them to the data collector through a high-temperature resistant cable. The heating power adjustment range is fixed to 0%~100%, and the temperature control accuracy target is set to ±0.5℃. Start the equipment and maintain the electronic control mode. The data collector collects temperature data of each area in real time at a frequency of 20 times per second. It can be set to collect data continuously for 1 hour. The difference between the maximum and minimum temperature values ​​of each area collected within 10 seconds is calculated. The number of times the fluctuation amplitude exceeds ±0.3℃ per minute is counted, and the temperature difference between two adjacent data points is divided by the time interval. The result is used as the temperature fluctuation index of the extrusion equipment barrel under the electronic control mode. Then, the operating data of the past period, for example, the operating data in the electronic control mode within 3 months, is extracted from the historical database of the equipment control system, and 50 groups of valid data segments in which the set temperature undergoes a step change are screened out, where the step change can be a temperature change of more than 20°C. The time when the set temperature changes is used as the time origin, and the time before is marked as a negative value, and the time after is marked as a positive value; the actual temperature value at each time point is extracted and arranged in chronological order to form a "time-actual temperature" correspondence table, and the time for the actual temperature in each group of data to reach the stable temperature after the set temperature change from the stable temperature before the set temperature change, as well as the difference between the actual temperature at each time point and the new stable value are calculated. The "time-actual temperature" correspondence tables of all groups and the calculated differences are summarized to obtain the temperature response sequence when heat conversion is performed through the set temperature in the historical operating data of the extrusion equipment. Finally, the historical set temperature change and actual electrical energy consumption are extracted from the temperature response sequence. Combined with the barrel's heat capacity, the historical conversion efficiency is calculated as (heat capacity × actual temperature change) ÷ electrical energy. Simultaneously, the current conversion efficiency is calculated based on the stable temperature change in the current temperature fluctuation index and the current electrical energy consumption. The average of the historical and current efficiencies is taken as the final conversion efficiency. The historical average time it takes for the actual temperature to reach 90% of the new stable value after a set temperature change is extracted from the temperature response sequence. Combined with the temperature change rate in the current temperature fluctuation index, the current response time is calculated as (set temperature change × 90%) ÷ current heating rate. The weighted average of the historical average time and the current response time is taken as the final response speed. The final conversion efficiency and final response speed are used as the temperature conversion properties of the extruder when converting heat at the set temperature under electronic control mode.

[0040] It should be noted that, in this application, the electric control mode refers to the operating mode in which the extrusion equipment sets the temperature through the electronic control system, drives the heating element to convert electrical energy into thermal energy, and realizes the temperature control of the barrel; the set temperature refers to the target temperature value preset by the control system before the extrusion equipment is operated to guide the operation of the heating device; heat conversion refers to the energy conversion process in which the extrusion equipment is in the electric control mode and the electrical energy is converted into thermal energy through the heating element and transferred to the barrel to achieve the set temperature; the temperature fluctuation index refers to the amplitude, frequency and rate of change of the actual temperature of the barrel of the extrusion equipment deviates from the set temperature in the electric control mode; the temperature response sequence refers to the ordered data set of the continuous change of the actual temperature of the barrel over time when the set temperature changes in the historical operation of the extrusion equipment; the temperature conversion property refers to the inherent characteristics exhibited by the extrusion equipment when the set temperature is converted into the actual heat of the barrel through the electric heating system in the electric control mode.

[0041] Preferably, in this embodiment, the stationary temperature circulation rule of the extrusion barrel temperature when matching the temperature control medium circulation is determined according to the temperature conversion property and all temperature control adaptation deviations, referring to Figure 3 As shown in FIG, this figure is a flow chart of determining the temperature-holding cycle rule in some embodiments of the present application. In this embodiment, determining the temperature-holding cycle rule can be implemented by the following steps: In step S31, dynamic configuration parameters of the temperature regulating medium circulating in each temperature zone of the barrel are determined according to the temperature conversion properties; In step S32, the temperature zone priority weights for temperature control medium circulation distribution are determined based on all dynamic configuration parameters; In step S33, determining the thermal interference conflict index under the coupling of multiple temperature zones of the extrusion barrel; In step S34, a stationary temperature circulation rule for the extrusion barrel temperature when matching the temperature regulating medium circulation is determined according to the temperature zone priority weight and the thermal interference conflict index.

[0042] In a specific implementation, the conversion efficiency, response speed, and stability index of each temperature zone are first extracted from the temperature conversion properties. The average values ​​of the conversion efficiency, response speed, and stability index for all temperature zones are calculated. The calculated average values ​​are used as dynamic configuration parameters for the temperature control medium circulation in each temperature zone of the barrel. In other embodiments, other methods can be used to determine the dynamic configuration parameters for the temperature control medium circulation in each temperature zone of the barrel, which are not limited here. Next, the dynamic configuration parameters of the medium flow rate, inlet and outlet temperature difference, and cycle frequency are assigned weights according to their importance. The actual value of each dynamic configuration parameter is divided by the maximum value of the parameter across all temperature zones to obtain a normalized value. The comprehensive score of each temperature zone is calculated using the following formula: Comprehensive score = (normalized flow rate value × 40%) + (normalized temperature difference value × 35%) + (normalized cycle frequency value × 25%). The comprehensive scores of each temperature zone are ranked from high to low, and the ranking result is used as the temperature zone priority weight when allocating the temperature control medium circulation. Then, the adjacent temperature zone combinations of the barrel (such as the feeding zone-melting zone, melting zone-homogenizing zone, homogenizing zone-die zone) and the interval temperature zone combinations (such as the feeding zone-homogenizing zone, melting zone-die zone) were selected as monitoring objects, and a thermal interference test was performed on each combination, that is: the parameters of other temperature zones were fixed, the set temperature of a certain temperature zone was increased by 5°C, and the actual temperature change of the affected temperature zone was recorded at the same time. The average value was taken after three consecutive tests. The thermal interference conflict index under the coupling of multiple temperature zones of the extrusion barrel can be calculated using the following formula: Thermal interference conflict index = (actual temperature change of the affected temperature zone ÷ set temperature change of the actively adjusted temperature zone) × 100%. The higher the value of the thermal interference conflict index, the stronger the interference. Finally, a medium allocation sequence rule is formulated, and the temperature control medium can be allocated from high to low according to the temperature zone priority weight, giving priority to meeting the dynamic configuration parameter requirements of the high-weight temperature zone; when the high-weight temperature zone reaches a stable temperature, the remaining medium is allocated to the second-highest-weight temperature zone. When the actual temperature of a temperature zone deviates from the target temperature by more than ±0.5°C, the flow adjustment of the temperature zone is triggered, and the adjustment range = target temperature deviation × (1 + the priority weight of the temperature zone); if the thermal interference conflict index between the temperature zone and other temperature zones is greater than 30% (strong interference), the adjustment timing is delayed until the interfered temperature zone is stable. For temperature zone combinations with thermal interference conflict index less than 20% (weak interference), synchronous circulation (simultaneous adjustment at intervals of 30 seconds) can be adopted; for combinations with indexes ≥20%, staggered circulation (alternating adjustment at intervals of 1 minute) is adopted, and the formulated medium allocation sequence rule is used as the stationary temperature circulation rule when the extrusion barrel temperature matches the temperature control medium circulation.

[0043] It should be noted that, in this application, the temperature control medium circulation refers to the temperature control medium (such as water, heat transfer oil) flowing in the pipes of each temperature zone of the barrel, and the circulation process of realizing temperature regulation of each temperature zone through heat exchange; the dynamic configuration parameter refers to the temperature control medium circulation parameter dynamically adjusted according to the temperature requirements of each temperature zone of the barrel; the temperature zone priority weight refers to the priority value of each temperature zone when allocating the temperature control medium when the total amount of temperature control medium is limited; the thermal interference conflict index refers to the parameter that quantitatively describes the degree of thermal interference between multiple temperature zones; the stationary temperature circulation rule represents the fixed logic guiding the circulation of the temperature control medium in each temperature zone of the barrel, including the medium allocation order, flow adjustment timing, and cycle interval.

[0044] In this embodiment, the reliable identification of the temperature correction strategy during the extrusion temperature feedback correction by the temperature dwelling cycle rule can be specifically implemented in the following manner, namely: Determining the temperature variation elimination constraint during extrusion temperature feedback correction based on the temperature stationary cycle rule; generating fusion identification information corresponding to a temperature correction strategy during extrusion temperature feedback correction according to the temperature change elimination constraint; The temperature correction strategy is verified to be credible based on the fused identification information to obtain a credible identified temperature correction strategy.

[0045] In the specific implementation, first, the target temperature range of each temperature zone, the maximum adjustment range of the temperature control medium flow, the minimum interval time between two adjacent temperature corrections, and the synchronous adjustment taboo of the thermal interference conflict zone are extracted from the temperature stationary cycle rules, and the constraints are set: the single temperature correction range of any temperature zone shall not exceed ±1°C; the temperature change rate shall not exceed 0.2°C / second; the interval between two consecutive corrections in the same temperature zone shall not be less than 30 seconds, which matches the medium circulation period of the temperature stationary cycle; the temperature zone combination with thermal interference conflict index greater than 30% shall not be subjected to temperature correction at the same time. The set constraints are used as temperature change elimination constraints during extrusion temperature feedback correction. Then, the actual temperature of each temperature zone is collected in real time through temperature sensors. The execution records of the 200 historical temperature correction strategies are extracted from the control system log, recording the current temperature variation elimination constraints. The deviation between the current actual temperature and the target temperature in each temperature zone is calculated. The average deviation elimination rate of historical correction strategies with similar deviations (e.g., within ±0.2°C) is calculated to determine whether the proposed correction strategy meets the temperature variation elimination constraints. A weighted fusion method is used to standardize the data and calculate a comprehensive score (ranging from 0 to 100). A higher score indicates a closer match between the strategy and actual requirements. The resulting score is used as the fused identification information corresponding to the temperature correction strategy for extrusion temperature feedback correction. Finally, a trustworthy verification standard is set: the comprehensive score of the fused identification information must be ≥70 points; the temperature correction strategy must meet all items of the temperature variation elimination constraints; and the standard deviation of the deviation elimination rate of similar temperature correction strategies in history must be ≤5%. Check whether the comprehensive score is ≥70 points. If it is lower, it is directly judged as unreliable. For temperature correction strategies that meet the score requirements, check each item to see whether they meet the temperature change elimination constraints. If one of them is violated, it is judged as unreliable. For the temperature correction strategies that meet the first two requirements, extract the deviation elimination rate data of similar temperature correction strategies in history and calculate the standard deviation. If it is ≤5%, it is judged as reliable, otherwise it is unreliable.

[0046] It should be noted that, in this application, extrusion temperature feedback correction refers to the deviation between the actual extrusion temperature detected in real time and the target temperature; temperature correction strategy refers to the specific adjustment plan formulated to eliminate the deviation between the extrusion temperature and the target temperature; temperature change elimination constraint refers to the restriction conditions set during the extrusion temperature feedback correction process to ensure that temperature changes can smoothly eliminate deviations and do not cause new temperature fluctuations; fusion identification information refers to the data set used to verify the effectiveness of the temperature correction strategy; temperature correction strategy after trusted identification refers to a temperature adjustment plan that has been confirmed by trusted verification, meets the constraints, and has a stable and effective correction effect; trusted verification refers to the process of verifying whether the temperature correction strategy meets the temperature change elimination constraint, can effectively eliminate temperature deviations and is stable.

[0047] The feedback control module 400 is used to perform collaborative interactive control on the extrusion temperature according to the operating guide temperature after parallel compensation and the temperature correction strategy after trustworthy identification.

[0048] In this embodiment, the extrusion temperature is collaboratively and interactively controlled based on the operating guide temperature after parallel compensation and the temperature correction strategy after trustworthy identification, specifically in the following manner: Determine the dynamic interaction entropy in cooperative interactive control based on the operating guidance temperature after parallel compensation and the temperature correction strategy after credible identification; Generate collaborative feedback weights of temperature control instructions through the dynamic interaction entropy; The final execution temperature of the cooperative interactive control of the extrusion temperature is determined by the cooperative feedback weight.

[0049] In specific implementation, the data acquisition system first acquires the real-time value of the operating guide temperature after parallel compensation and the temperature change rate within one minute. Simultaneously, the adjustment amplitude and frequency of the temperature correction strategy after trusted identification are extracted. The Pearson correlation coefficient is used to calculate the correlation between the real-time value of the operating guide temperature after parallel compensation and the adjustment amplitude of the temperature correction strategy after trusted identification (value range: -1 to 1). A positive value indicates a positive correlation, a negative value indicates a negative correlation, and a larger absolute value indicates a higher correlation. The entropy value is calculated based on the correlation: dynamic interaction entropy = 1 - |correlation coefficient|. When the correlation coefficient is 0.7, dynamic interaction entropy = 1 - 0.7 = 0.3; if the correlation coefficient is -0.5, dynamic interaction entropy = 1 - 0.5 = 0.5. Entropy values ​​range from 0 to 1, with smaller values ​​indicating better synergy (more orderly interaction) and larger values ​​indicating worse synergy (more chaotic interaction). Then, when the dynamic interaction entropy is ≤ 0.3, the weight of the operating guidance temperature after parallel compensation (w1) is 0.5, and the weight of the temperature correction strategy after credible identification (w2) is 0.5. When 0.3 < dynamic interaction entropy ≤ 0.6: w1 = 0.4, w2 = 0.6 (the influence of the correction strategy is enhanced, as it is more stable after credible identification). When the dynamic interaction entropy is greater than 0.6: w1 = 0.3, w2 = 0.7 (further strengthening the dominance of the correction strategy and weakening the influence of the guidance temperature with poor synergy). Calculate the specific weight values: If the real-time dynamic interaction entropy is 0.4 (in the 0.3-0.6 range), then use w1 = 0.4 and w2 = 0.6 according to the rules; if the entropy is 0.7, use w1 = 0.3 and w2 = 0.7. The weight values ​​must satisfy w1 + w2 = 1. The calculated result serves as the collaborative feedback weight for the temperature control command. Finally, the weighted summation formula is used: Final execution temperature = w1 × Operating guide temperature after parallel compensation + w2 × Target adjustment value of the temperature correction strategy after trusted identification. The calculated final execution temperature is sent in real time to the temperature control actuator of the extrusion equipment (such as the heating rod and water-cooling valve), driving the actuator to adjust the flow rate so that the actual barrel temperature converges to this value.

[0050] It should be noted that, in this application, extrusion temperature refers to the target temperature value obtained after weighting by collaborative feedback weight, which is used to drive the temperature control actuator of the extrusion equipment; dynamic interaction entropy refers to the parameter that quantifies the degree of interaction between the operating guidance temperature after parallel compensation and the temperature correction strategy after credible identification; temperature control instruction refers to the target temperature instruction used to drive the temperature control actuator; collaborative feedback weight refers to the proportion of the operating guidance temperature after parallel compensation and the temperature correction strategy after credible identification in the final control instruction.

[0051] It can be seen from this that in the present application, precise coordinated control of temperature can be achieved during the extrusion process of precision cable sheathing; among them, by obtaining the dynamic temperature information of each heating zone of the extrusion equipment under the same process conditions and the temperature control adaptation deviation of each process interval, it is possible to fully capture the dynamic temperature changes and process adaptation differences, provide a complete data basis for subsequent temperature control, and effectively improve the perception of complex extrusion conditions; by determining the temperature variation fluctuation sequence under the closed-circuit water circulation mode, analyzing the temperature adjustment hysteresis trend and performing parallel compensation for the operating guide temperature, it is possible to offset the influence of temperature variation hysteresis in advance, so that the temperature response and wire diameter change are accurately matched, significantly improving the timeliness and foresight of temperature control; by detecting the temperature conversion properties under the electronic control mode, determining the temperature stationary cycle rules and reliably identifying the temperature correction strategy, it is possible to ensure the reliability of the temperature control medium circulation and correction strategy, avoid invalid or conflicting temperature adjustments, and enhance the stability of temperature control and the effectiveness of the strategy; by performing collaborative interactive control based on the operating guide temperature after parallel compensation and the temperature correction strategy after reliably identified, it is possible to achieve dynamic and precise temperature regulation, greatly improving the dimensional accuracy and product quality consistency of the precision cable sheath.

[0052] In summary, the technical solution adopted in this application can collaboratively optimize the temperature control factors under complex extrusion conditions to improve the processing accuracy of precision cable sheaths.

[0053] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0054] Those skilled in the art will appreciate that all or part of the steps in the various methods of the above embodiments can be completed by instructing related hardware through a program. The program can be stored in a computer-readable storage medium, including a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM), or other optical disc storage, magnetic disk storage, or magnetic tape storage, or any other computer-readable medium capable of carrying or storing data.

[0055] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

Claims

1. A temperature feedback control system for precision cable sheath extrusion process, characterized in that: The temperature feedback control system comprises: The temperature acquisition module is used to obtain the dynamic temperature information of each heating zone and the temperature control adaptation deviation within each extrusion process interval when the extrusion equipment extrudes the precision cable sheath under the same extrusion process conditions; A parallel compensation module is used to determine the temperature variation fluctuation sequence of the extrusion equipment when operating in a closed-circuit water circulation mode, and determine the temperature adjustment hysteresis trend of the extrusion barrel temperature in response to the change in wire diameter based on the temperature variation fluctuation sequence and all dynamic temperature information. The temperature adjustment hysteresis trend is then used to perform parallel compensation for the operating guide temperature fed back from the barrel external flow channel during sheath extrusion; A trusted identification module is used to detect in real time the temperature conversion properties of the extrusion equipment when performing heat conversion by setting the temperature in the electronic control mode. Based on the temperature conversion properties and all temperature control adaptation deviations, the temperature stationary cycle rule of the extrusion barrel temperature when matching the temperature control medium circulation is determined. The temperature stationary cycle rule is then used to trust the temperature correction strategy during the extrusion temperature feedback correction. The feedback control module is used to collaboratively and interactively control the extrusion temperature based on the operating guidance temperature after parallel compensation and the temperature correction strategy after credible identification.

2. A temperature feedback control system for a precision cable sheath extrusion process according to claim 1, characterized in that: The temperature control adaptation deviation refers to the difference between the actual temperature of the extrusion equipment and the set temperature in different extrusion process ranges.

3. A temperature feedback control system for a precision cable sheath extrusion process according to claim 1, characterized in that: The dynamic temperature information refers to the temperature data of each heating zone of the extrusion equipment that changes continuously over time during the extrusion process.

4. A temperature feedback control system for a precision cable sheath extrusion process according to claim 1, characterized in that: Determine the temperature variation sequence when the extrusion equipment is running in closed water circulation mode, including: Determine static temperature deviations when extrusion equipment is operating in closed-loop water circulation mode; Determining the adjacent temperature gradient when the operating temperature changes by using the static temperature deviation; A temperature variation fluctuation sequence is determined based on the adjacent temperature gradient when the extrusion equipment is operated in a closed-circuit water circulation mode.

5. A temperature feedback control system for a precision cable sheath extrusion process according to claim 1, characterized in that: The response to wire diameter change refers to the process in which the extrusion equipment senses the change in cable diameter and adjusts the barrel temperature to adapt to the new wire diameter processing requirements.

6. A temperature feedback control system for a precision cable sheath extrusion process according to claim 1, characterized in that: The parallel compensation of the operating guide temperature fed back in the flow channel outside the barrel during the extrusion of the sheath by the temperature adjustment hysteresis trend specifically includes: Determining the thermal inertia compensation margin of the external flow channel of the barrel according to the temperature adjustment hysteresis trend; Obtain the operating guidance temperature fed back from the flow channel outside the barrel during sheath extrusion; The thermal inertia compensation margin is dynamically allocated to the operating guide temperature to obtain the operating guide temperature after parallel compensation.

7. A temperature feedback control system for a precision cable sheath extrusion process according to claim 1, characterized in that: Real-time detection of the temperature conversion properties of the extruder when performing heat conversion by setting the temperature in the electronic control mode specifically includes: Real-time collection of temperature fluctuation indicators of the extrusion equipment barrel under electronic control mode; Determine the temperature response sequence when heat is converted through set temperatures in the historical operating data of the extrusion equipment; The temperature conversion property of the extrusion device when performing heat conversion by setting the temperature in the electronic control mode is determined according to the temperature fluctuation index and the temperature response sequence.

8. A temperature feedback control system for a precision cable sheath extrusion process according to claim 1, characterized in that: The closed-circuit water circulation mode refers to an operating mode in which water circulates between the extrusion equipment and the temperature control device through pipes.

9. A temperature feedback control system for a precision cable sheath extrusion process according to claim 1, characterized in that: The temperature regulating medium circulation refers to the circulation process in which the temperature regulating medium flows in the pipes of each temperature zone of the barrel and realizes temperature regulation of each temperature zone through heat exchange.

10. A temperature feedback control system for a precision cable sheath extrusion process according to claim 1, characterized in that: The collaborative interactive control of the extrusion temperature based on the operating guidance temperature after parallel compensation and the temperature correction strategy after trustworthy identification specifically includes: Determine the dynamic interaction entropy in cooperative interactive control based on the operating guidance temperature after parallel compensation and the temperature correction strategy after credible identification; Generate collaborative feedback weights of temperature control instructions through the dynamic interaction entropy; The final execution temperature of the cooperative interactive control of the extrusion temperature is determined by the cooperative feedback weight.

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