A temperature feedback control system for precision cable jacket extrusion processes

Abstract

The application provides a temperature feedback control system for a precision cable sheath extrusion process, relates to the technical field of temperature feedback control, determines a temperature variation action sequence when an extrusion device operates in a closed water circulation mode, determines a temperature adjustment hysteresis trend of an extrusion barrel temperature when a response line diameter changes according to the temperature variation action sequence and all dynamic temperature information, and performs parallel compensation on feedback operation guide temperature in the outer flow channel of the barrel during sheath extrusion according to the temperature adjustment hysteresis trend; determines a temperature holding circulation rule of the extrusion barrel temperature when matching a temperature adjustment medium circulation according to temperature conversion attributes and all temperature control adaptation deviations, and performs credible identification on a temperature correction strategy during extrusion temperature feedback correction; and performs cooperative interactive control on the extrusion temperature according to the operation guide temperature after parallel compensation and the temperature correction strategy after credible identification. The application can cooperatively optimize temperature control elements under complex extrusion conditions, so as to improve the processing precision of the precision cable sheath.

Description

TECHNICAL FIELD

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

[0002] Temperature feedback control refers to a method of monitoring the actual temperature of each temperature zone of the barrel during the precision cable sheath extrusion process in real time, comparing it with the set temperature, obtaining temperature deviation information, and dynamically adjusting the operating parameters of the heating or cooling system according to the deviation size and change trend, so as to realize precise regulation of the extrusion temperature. This control mechanism can respond to temperature deviations caused by factors such as changes in raw material properties and changes in equipment operating state in the extrusion process in a timely manner, and through continuous feedback and correction, ensures that the barrel temperature is stable within the process requirement range, thereby ensuring the size accuracy, mechanical properties and other key indicators of the cable sheath, and improving the consistency of product quality.

[0003] However, in the existing temperature feedback control of the precision cable sheath extrusion, the dynamic temperature fluctuation and process interval adaptation deviation are not effectively integrated, the temperature variation dynamic sequence under closed-loop water circulation and the temperature adjustment hysteresis trend caused by the change in wire diameter are not accurately quantified, and the temperature control strategy is not combined with the heat conversion properties of the electric control mode and the temperature adjustment medium circulation rules for reliable verification, resulting in problems such as response lag, insufficient compensation and low strategy reliability in temperature control, poor extrusion temperature stability, large sheath size accuracy and mechanical property fluctuations, and thus affecting the consistency of product quality. Therefore, how to synergistically optimize the temperature control elements under complex extrusion conditions to improve the processing precision of the precision cable sheath is a difficult problem faced by the industry. SUMMARY

[0004] The present application provides a temperature feedback control system for a precision cable sheath extrusion process, which can synergistically optimize temperature control elements under complex extrusion conditions to improve the processing precision 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, which comprises:

[0006] a temperature acquisition module for acquiring dynamic temperature information of each heating zone and temperature control adaptation deviation in each extrusion process interval when the extrusion equipment extrudes the precision cable sheath under the same extrusion process condition;

[0007] The parallel compensation module is configured to determine a temperature change dynamic sequence of the extrusion equipment when the extrusion equipment is running in the closed water circulation mode, determine a temperature adjustment hysteresis trend of the extrusion barrel temperature when the response line diameter changes according to the temperature change dynamic sequence and all dynamic temperature information, and then perform parallel compensation on the running guide temperature fed back in the flow channel outside the barrel during sheath extrusion according to the temperature adjustment hysteresis trend.

[0008] The trusted recognition module is configured to detect a temperature conversion attribute of the extrusion equipment when the extrusion equipment converts heat by setting a temperature in the electric control mode in real time, determine a temperature holding circulation rule of the extrusion barrel temperature when matching the temperature adjustment medium circulation according to the temperature conversion attribute and all temperature control adaptation deviations, and then perform trusted recognition on a temperature correction strategy when the extrusion temperature is corrected according to the temperature holding circulation rule.

[0009] The feedback control module is configured to perform cooperative interactive control on the extrusion temperature according to the running guide temperature after the parallel compensation and the temperature correction strategy after the trusted recognition.

[0010] In the embodiment, the temperature control adaptation deviation refers to a difference between an actual temperature and a set temperature of the extrusion equipment in different extrusion process intervals.

[0011] In the embodiment, the dynamic temperature information refers to temperature data of each heating zone of the extrusion equipment continuously changing over time during the extrusion process.

[0012] In the embodiment, the determination of the temperature change dynamic sequence of the extrusion equipment when the extrusion equipment is running in the closed water circulation mode specifically includes:

[0013] Determination of a static temperature deviation of the extrusion equipment when the extrusion equipment is running in the closed water circulation mode.

[0014] Determination of an adjacent temperature gradient when the running temperature changes through the static temperature deviation.

[0015] Determination of the temperature change dynamic sequence of the extrusion equipment when the extrusion equipment is running in the closed water circulation mode according to the adjacent temperature gradient.

[0016] In the embodiment, the response line diameter change refers to a process of adjusting the barrel temperature to adapt to the new line diameter processing requirement after the extrusion equipment senses the cable line diameter change.

[0017] In the embodiment, the parallel compensation on the running guide temperature fed back in the flow channel outside the barrel during sheath extrusion according to the temperature adjustment hysteresis trend specifically includes:

[0018] Determination of a thermal inertia compensation margin of the flow channel outside the barrel through the temperature adjustment hysteresis trend.

[0019] Obtaining the running guide temperature fed back in the flow channel outside the barrel during sheath extrusion.

[0020] The thermal inertia compensation margin is dynamically allocated to the operating guide temperature to obtain a parallel-compensated operating guide temperature.

[0021] In the embodiment, the temperature conversion attribute of the extrusion equipment in the electric control mode when converting heat by setting temperature specifically includes:

[0022] The temperature fluctuation index of the barrel of the extrusion equipment in the electric control mode is collected in real time.

[0023] The temperature response sequence of the extrusion equipment when converting heat by setting temperature is determined from historical operation data of the extrusion equipment.

[0024] The temperature conversion attribute of the extrusion equipment in the electric control mode when converting heat by setting temperature is determined according to the temperature fluctuation index and the temperature response sequence.

[0025] In the embodiment, the closed-loop water circulation mode refers to an operation mode in which water is circulated between the extrusion equipment and the temperature control device through a pipeline.

[0026] In the embodiment, the temperature adjustment medium circulation refers to a circulation process in which the temperature adjustment medium flows in the pipeline of each temperature zone of the barrel and temperature adjustment of each temperature zone is achieved through heat exchange.

[0027] In the embodiment, the synergistic interactive control of the extrusion temperature according to the parallel-compensated operating guide temperature and the temperature correction strategy after reliable identification specifically includes:

[0028] The dynamic interaction entropy in the synergistic interactive control is determined according to the parallel-compensated operating guide temperature and the temperature correction strategy after reliable identification.

[0029] The synergistic feedback weight of the temperature control instruction is generated through the dynamic interaction entropy.

[0030] The final execution temperature of the synergistic interactive control of the extrusion temperature is determined through the synergistic feedback weight.

[0031] The technical scheme provided by the embodiments disclosed in the application has the following beneficial effects:

[0032] The temperature control method comprises the following steps: acquiring dynamic temperature information of each heating zone and temperature control adaptive deviation of each extrusion process interval of an extrusion device when the extrusion device extrudes a precision cable sheath under the same extrusion process condition; determining a temperature variation dynamic sequence when the extrusion device runs in a closed water circulation mode; determining a temperature adjustment lagging trend of the extrusion barrel temperature when responding to the line diameter change according to the temperature variation dynamic sequence and all the dynamic temperature information; then performing parallel compensation on the running guide temperature fed back in the flow channel outside the barrel during sheath extrusion according to the temperature adjustment lagging trend; detecting a temperature conversion attribute when the extrusion device converts heat by setting the temperature in the electric control mode in real time; determining a temperature standing cycle rule of the extrusion barrel temperature when matching the temperature adjustment medium circulation according to the temperature conversion attribute and all the temperature control adaptive deviations; then performing credible identification on the temperature correction strategy when the extrusion temperature is corrected according to the temperature standing cycle rule; and performing coordinated interactive control on the extrusion temperature according to the running guide temperature after the parallel compensation and the temperature correction strategy after the credible identification.

[0033] It can be seen that in the present application, precise coordinated control of temperature can be realized during the extrusion process of the precision cable sheath. By acquiring dynamic temperature information of each heating zone and temperature control adaptive deviation of each process interval of the extrusion device under the same process condition, temperature dynamic change and process adaptive difference can be comprehensively captured, providing a complete data basis for subsequent temperature control and effectively improving the perception ability of complex extrusion conditions. By determining the temperature variation dynamic sequence in the closed water circulation mode, analyzing the temperature adjustment lagging trend and performing parallel compensation on the running guide temperature, the temperature variation lagging influence can be offset in advance, the temperature response can be accurately matched with the line diameter change, and the timeliness and foresight of temperature control can be significantly improved. By detecting the temperature conversion attribute in the electric control mode, determining the temperature standing cycle rule and performing credible identification on the temperature correction strategy, the reliability of the temperature adjustment medium circulation and the correction strategy can be ensured, invalid or conflicting temperature adjustment can be avoided, and the stability and strategy effectiveness of temperature control can be enhanced. By performing coordinated interactive control according to the running guide temperature after the parallel compensation and the temperature correction strategy after the credible identification, dynamic and precise regulation of temperature can be realized, and the size precision and product quality consistency of the precision cable sheath can be greatly improved.

[0034] In summary, the technical solution adopted in the present application can optimize the temperature control elements in complex extrusion conditions to improve the processing precision of the precision cable sheath. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only the embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0036] Figure 1 is a module structure diagram of a temperature feedback control system for a precision cable sheath extrusion process according to the present application;

[0037] Figure 2 is a flowchart for determining a temperature adjustment hysteresis trend according to the present application;

[0038] Figure 3 is a flowchart for determining a temperature holding cycle rule according to the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0040] The present application provides a temperature feedback control system for a precision cable sheath extrusion process, which acquires dynamic temperature information of each heating zone and temperature control adaptation deviation in each extrusion process interval when the extrusion equipment extrudes a precision cable sheath under the same extrusion process condition, determines a temperature variation dynamic sequence when the extrusion equipment runs in a closed water circulation mode, determines a temperature adjustment hysteresis trend of the extrusion barrel temperature when the line diameter changes according to the temperature variation dynamic sequence and all the dynamic temperature information, and then compensates the running guide temperature fed back in the flow channel outside the barrel during sheath extrusion in parallel according to the temperature adjustment hysteresis trend. The present application detects the temperature conversion attribute when the extrusion equipment converts heat by setting the temperature in an electric control mode in real time, determines a temperature holding cycle rule of the extrusion barrel temperature when matching the temperature adjustment medium circulation according to the temperature conversion attribute and all the temperature control adaptation deviations, and then performs credible identification on the temperature correction strategy when the extrusion temperature is fed back according to the temperature holding cycle rule. The present application performs coordinated interactive control on the extrusion temperature according to the running guide temperature after parallel compensation and the temperature correction strategy after credible identification.

[0041] In order to better understand the above technical solutions, the above technical solutions will be described in detail below with reference to the drawings in the specification and specific embodiments. Referring to Figure 1 The figure is a module structure diagram of a temperature feedback control system for a precision cable sheath extrusion process according to the present application, which includes a temperature acquisition module 100, a parallel compensation module 200, a credible identification module 300 and a feedback control module 400, which are described as follows:

[0042] The temperature acquisition module 100 is configured to acquire dynamic temperature information of each heating zone of the extrusion equipment when the extrusion equipment extrudes the precision cable sheath under the same extrusion process condition and temperature control adaptation deviation in each extrusion process interval.

[0043] In a specific implementation, the dynamic temperature information of each heating zone of the extrusion equipment when the extrusion equipment extrudes the precision cable sheath under the same extrusion process condition can be acquired in the following manner: A platinum resistance temperature sensor with a precision of ±0.1℃ is installed on the surface of each heating zone of the extrusion equipment, such as the feeding zone, the melting zone, the homogenizing zone, and the die head zone. The sensor is connected to a data acquisition instrument through a shielded cable. The sampling frequency of the data acquisition instrument is set to 10 times per second to ensure capturing the subtle changes in temperature. The extrusion process condition is kept stable, that is, the screw rotation speed is fixed at 50 r / min, the feeding rate is 20 kg / h, and the set temperature of each heating zone is set (for example, the feeding zone is set to 150℃ and the melting zone is set to 200℃). The equipment is started to extrude the precision cable sheath. The temperature data is continuously collected for 3 hours. The data acquisition instrument automatically stores the data in CSV format. After being imported into a computer, the temperature-time curve of each heating zone is generated by using a data analysis software, which is the dynamic temperature information.

[0044] It should be noted that, in the present application, the dynamic temperature information refers to the temperature data of each heating zone of the extrusion equipment continuously changing with time during the extrusion process.

[0045] In addition, in a specific implementation, the temperature control adaptation deviation in each extrusion process interval can be acquired in the following manner: The extrusion process interval is divided, for example, into three intervals according to the cable diameter, that is, 1mm-2mm, 2mm-3mm, and 3mm-4mm. In each interval, the actual temperature data is collected, and the set temperature of the corresponding interval is recorded. For each set of temperature data in each interval, the instantaneous deviation is obtained by subtracting the set temperature from the actual temperature. The average value, the maximum value, and the standard deviation of all the instantaneous deviations in the interval are calculated, and the calculation results are taken as the temperature control adaptation deviation in the extrusion process interval.

[0046] It should be noted that, in the present application, 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.

[0047] The parallel compensation module 200 is configured to determine a temperature variation dynamic sequence of the extrusion equipment when the extrusion equipment operates in the closed-loop water circulation mode, determine a temperature adjustment hysteresis trend of the extrusion barrel when the temperature of the extrusion barrel responds to the change in the cable diameter according to the temperature variation dynamic sequence and all the dynamic temperature information, and perform parallel compensation on the operation guide temperature fed back from the flow channel outside the barrel during the sheath extrusion according to the temperature adjustment hysteresis trend.

[0048] In the present embodiment, the temperature variation dynamic sequence of the extrusion equipment when the extrusion equipment operates in the closed-loop water circulation mode can be determined in the following manner:

[0049] determining a static temperature deviation of the extrusion equipment when running in the closed water circulation mode;

[0050] determining an adjacent temperature gradient when the running temperature changes through the static temperature deviation;

[0051] determining a temperature change action sequence of the extrusion equipment when running in the closed water circulation mode according to the adjacent temperature gradient.

[0052] In a specific implementation, first, the closed water circulation system parameters of the extrusion equipment are set to fixed values, such as setting the circulating water temperature to 45℃ and the water flow rate to 1.5 L / min, and the set temperatures of each heating zone of the extrusion equipment are fixed (such as 160℃ for the feeding zone, 210℃ for the melting zone, 200℃ for the homogenizing zone, and 190℃ for the head zone); high-precision temperature sensors are installed at key positions of the equipment, the measurement accuracy of the sensors needs to reach ±0.1℃, the equipment is started and kept running in the closed water circulation mode, the actual temperature is recorded every 1 minute for each monitoring point, 30 times of continuous recording are performed, for each monitoring point, the actual temperature recorded each time is subtracted from the corresponding set temperature to obtain 30 instantaneous deviation values, and then the average of the 30 instantaneous deviation values is calculated, which is the static temperature deviation when running in the closed water circulation mode. Then, the position distribution of each monitoring point is determined, the adjacent monitoring points (such as the feeding section and the melting section, the melting section and the homogenizing section, and the homogenizing section and the head position) are determined, the actual temperature difference of the adjacent two monitoring points is calculated, and the linear distance between the two monitoring points is measured, and the actual temperature difference of the adjacent monitoring points is divided by the distance between the two points to obtain the adjacent temperature gradient between the two adjacent monitoring points, that is, the adjacent temperature gradient when the running temperature changes. Finally, the actual temperature value is recorded every 10 seconds for each monitoring point to form a time-temperature data set 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 labeled to form a complete temperature change action sequence, that is, the temperature change action sequence of the extrusion equipment when running in the closed water circulation mode is obtained.

[0053] It should be noted that, in this application, the closed water circulation mode refers to an operation mode in which water is circulated between the extrusion equipment and the temperature control device through a pipeline to exchange heat and control 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 running in the closed water circulation mode; the adjacent temperature gradient refers to the temperature change rate between two adjacent monitoring points during the running of the extrusion equipment; and the temperature change action sequence refers to an ordered data set in which the temperature of each monitoring point continuously changes with time when the extrusion equipment is running in the closed water circulation mode.

[0054] Preferably, in the present embodiment, the temperature adjusting hysteresis trend of the extrusion barrel temperature in response to the line diameter change is determined according to the temperature change dynamic sequence and all dynamic temperature information, and the temperature adjusting hysteresis trend is referenced Figure 2 As shown in the figure, the figure is a flow diagram for determining the temperature adjusting hysteresis trend in some embodiments of the present application, and the temperature adjusting hysteresis trend in the present embodiment can be achieved by the following steps:

[0055] In step S21, the temperature response characteristics of the extrusion barrel under dynamic working conditions are determined by the temperature change dynamic sequence;

[0056] In step S22, the temperature transfer boundary in response to the line diameter change is extracted from all dynamic temperature information;

[0057] In step S23, the temperature adjusting hysteresis gap of the extrusion barrel temperature in response to the line diameter change is determined;

[0058] In step S24, the temperature adjusting hysteresis trend of the extrusion barrel temperature in response to the line diameter change is determined according to the temperature response characteristics, the temperature transfer boundary and the temperature adjusting hysteresis gap.

[0059] In a specific implementation, first, 4 hours of continuous barrel temperature data is extracted from the temperature variation dynamic sequence and arranged in time order as time-temperature data set. The cable diameter is artificially changed at different time points (e.g., from 2 mm to 3 mm, from 3 mm to 2.5 mm), and the time of diameter change is recorded. For each diameter change time, the temperature data before and after the change is intercepted, the average rate of temperature rise from the initial value to the new stable value, the time required to reach the stable value, and the temperature fluctuation amplitude are calculated, and the calculated data is taken as the temperature response characteristics of the extrusion barrel under dynamic working conditions. Then, the temperature data segment containing the diameter change process is filtered out from all dynamic temperature information, the temperature data of each heating zone is analyzed, and the stable temperature value before the diameter change and the stable temperature value after the diameter change are marked. The temperature critical value between adjacent heating zones is determined: at the junction of the feeding zone and the melting zone, the critical temperature before the diameter change is 165℃, and the critical temperature after the diameter change is 170℃ due to the heat transfer demand, which are the temperature transfer boundaries of the border in response to the diameter change. Then, the diameter change time is recorded in real time by the diameter detection device, the temperature data of the barrel is extracted from the dynamic temperature information, the time when the temperature starts to deviate from the original stable value is found, and the difference between the two times is calculated. The difference is the temperature adjustment hysteresis gap of the extrusion barrel in response to the diameter change. Finally, a three-dimensional analysis model is established, the horizontal axis is the temperature rise rate in the temperature response characteristics, the vertical axis is the critical temperature value of the temperature transfer boundary, and the third axis is the temperature adjustment hysteresis gap. The temperature response characteristics, temperature transfer boundary, and temperature adjustment hysteresis gap are entered into the model, and the data distribution rule is analyzed: for example, when the temperature rise rate increases to 1.5℃ / min and the critical temperature rises to 175℃, the hysteresis gap shortens to 3 seconds; when the temperature rise rate decreases to 0.8℃ / min and the critical temperature decreases to 165℃, the hysteresis gap extends to 7 seconds, forming an overall change trend of "the faster the temperature rise rate, the higher the critical temperature, and the shorter the hysteresis gap". The overall change trend is taken as the temperature adjustment hysteresis trend of the extrusion barrel in response to the diameter change.

[0060] It should be noted that in this application, the response to the diameter change refers to the process of adjusting the barrel temperature to adapt to the new diameter processing requirements after the extrusion equipment senses the change in the cable diameter; the temperature response characteristics refer to the law of temperature change with the diameter change and the adjustment of water circulation parameters under dynamic working conditions; the temperature transfer boundary refers to the temperature critical value of different regions of the barrel in response to the diameter change; the temperature adjustment hysteresis gap refers to the time difference between the time when the diameter starts to change and the time when the barrel temperature starts to respond to the change; and the temperature adjustment hysteresis trend refers to the overall change trend of the temperature adjustment hysteresis of the extrusion barrel in response to the diameter change.

[0061] In the embodiment, the parallel compensation of the running guide temperature fed back in the flow channel outside the barrel during the sheath extrusion by the temperature adjustment hysteresis trend can be achieved by the following steps, that is:

[0062] determining the thermal inertia compensation margin of the flow channel outside the barrel through the temperature adjustment hysteresis trend;

[0063] acquiring the running guide temperature fed back in the flow channel outside the barrel during the sheath extrusion;

[0064] dynamically allocating the thermal inertia compensation margin to the running guide temperature to obtain the running guide temperature after the parallel compensation.

[0065] In the specific implementation, first, the thermal inertia parameters of the flow channel outside the barrel can be obtained by experimentally acquiring the specific heat capacity, mass, surface area and other data of the flow channel material, calculating the heat capacity of the flow channel (heat capacity = specific heat capacity x mass), and recording the heat dissipation rate at different ambient temperatures; the thermal inertia compensation margin can be calculated by the following formula: thermal inertia compensation margin = required temperature rise value - natural temperature rise value during hysteresis. If there is heat dissipation, the heat dissipation loss needs to be additionally superimposed, that is, the product of the unit time and the absolute value of the temperature change per unit time. Then, platinum resistance temperature sensors with an accuracy of ±0.1℃ are installed at the inlet section, middle section and outlet section of the flow channel outside the barrel, the sensor probe is in close contact with the inner wall of the flow channel, the sampling frequency is set to 10 times per second, the abnormal values are removed, and then the weighted average algorithm is used, and the calculated weighted average value is taken as the running guide temperature fed back in the flow channel outside the barrel during the sheath extrusion. Finally, the line diameter detector is used to acquire the line diameter change rate in real time, and the deviation between the actual temperature and the running guide temperature is calculated, and the rules are set: when the line diameter changes rapidly and the actual temperature is lower than the guide temperature, 100% thermal inertia compensation margin is added to the guide temperature; when the line diameter changes slowly and the actual temperature is close to the guide temperature, 50% thermal inertia compensation margin is added; when the line diameter does not change, 0% thermal inertia compensation margin is added. The control system dynamically allocates in real time: the line diameter change rate and the temperature deviation are read every 50 milliseconds, the thermal inertia compensation margin that should be added at present is calculated according to the set rules, and the formula is: running guide temperature after parallel compensation = running guide temperature + (thermal inertia compensation margin x allocation proportion). The compensated temperature instruction is sent to the heating device and the cooling device of the flow channel, the actuator is driven to adjust the power or flow rate in real time, and the temperature control is realized.

[0066] It should be noted that in the present application, the outer flow channel of the barrel refers to the pipeline arranged around the barrel of the extruder for circulating the temperature control medium to regulate the temperature of the barrel; the running guide temperature refers to the target temperature value of the outer flow channel of the barrel for guiding the temperature control of the flow channel during the sheath extrusion process; the thermal inertia compensation margin refers to the temperature compensation amount set in advance to offset the temperature response delay of the outer flow channel of the barrel due to thermal inertia; the parallel compensation refers to the additional compensation amount added to the running guide temperature outside the original temperature control loop to offset the delay in a synchronous manner with the original control; the dynamic allocation refers to adjusting the proportion of the thermal inertia compensation margin added to the running guide temperature according to the real-time extrusion working condition, and the running guide temperature after parallel compensation refers to the new target temperature formed by adding the thermal inertia compensation margin to the original running guide temperature according to the dynamic allocation rule.

[0067] The trusted recognition module 300 is configured to detect in real time a temperature conversion attribute of the extrusion equipment when converting heat by setting a temperature in the electric control mode, determine a temperature holding cycle rule of the extrusion barrel temperature when matching the temperature control medium circulation according to the temperature conversion attribute and all temperature control adaptation deviations, and then perform trusted recognition on a temperature correction strategy when the extrusion temperature is corrected according to the temperature holding cycle rule.

[0068] In the present embodiment, the temperature conversion attribute of the extrusion equipment when converting heat by setting a temperature in the electric control mode can be detected in real time by the following steps, that is:

[0069] Real-time acquisition of a temperature fluctuation index of the barrel of the extrusion equipment in the electric control mode;

[0070] Determination of a temperature response sequence of the extrusion equipment when converting heat by setting a temperature in the historical operation data of the extrusion equipment;

[0071] Determination of a temperature conversion attribute of the extrusion equipment when converting heat by setting a temperature in the electric control mode according to the temperature fluctuation index and the temperature response sequence.

[0072] In a specific implementation, first, install one thermocouple temperature sensor in each of the feeding zone, melting zone, homogenizing zone and die head zone of the extrusion equipment barrel, and connect it to the data collector through a high-temperature-resistant cable, fix the heating power adjustment range as 0%-100%, set the temperature control accuracy target as ±0.5℃, start the equipment and maintain the electric control mode operation, the data collector collects real-time temperature data of each zone at a frequency of 20 times per second, which can be set to continuously collect for 1 hour, calculate the difference between the maximum and minimum values of the temperature collected in each 10 seconds of each zone, count the number of times the fluctuation amplitude exceeds ±0.3℃ per minute, and divide the temperature difference between the adjacent two data points by the time interval to obtain the result as the temperature fluctuation index of the extrusion equipment barrel in the electric control mode. Then, extract the running data in the electric control mode in the past period of time, such as 3 months, from the historical database of the equipment control system, filter out 50 groups of effective data segments with step changes in the set temperature, where the step change can be a temperature change of more than 20℃, take the set temperature change time as the time origin, mark the previous time as negative and the subsequent time as positive; extract the actual temperature value at each time point, arrange them in chronological order to form a "time-actual temperature" correspondence table, calculate the time for the actual temperature to change from the stable temperature before the set temperature change to the stable temperature after the set temperature change in each group of data, and the difference between the actual temperature at each time point and the new stable value, and all groups of "time-actual temperature" correspondence tables and the calculated differences are summarized to obtain the temperature response sequence in the historical running data of the extrusion equipment when the heat is converted by the set temperature. Finally, extract the set temperature change amount and the actual consumed electric energy from the temperature response sequence in history, combine the heat capacity of the barrel to obtain the historical conversion efficiency = (heat capacity x actual temperature change amount) ÷ electric energy; at the same time, calculate the current conversion efficiency according to the stable segment temperature change amount in the current temperature fluctuation index and the current consumed electric energy, take the average value of the historical and current efficiencies as the final conversion efficiency; extract the average time for the actual temperature to reach 90% of the new stable value after the set temperature change in history from the temperature response sequence; combine the temperature change rate in the current temperature fluctuation index to calculate the current response time = (set temperature change amount x 90%) ÷ current heating rate, and take the weighted average of the historical average time and the current response time as the final response speed. Take the final conversion rate and the final response speed as the temperature conversion properties of the extrusion equipment in the electric control mode when converting heat by the set temperature.

[0073] It should be noted that in the present application, the electric control mode refers to the operation mode of the extrusion equipment in which the temperature is set by the electronic control system, the heating element is driven to convert electrical energy into heat energy, and the barrel temperature is regulated; the set temperature refers to the target temperature value preset by the control system before the operation of the extrusion equipment, which is used to guide the work of the heating device; the heat conversion refers to the energy conversion process in which the electrical energy is converted into heat energy by the heating element in the electric control mode of the extrusion equipment, and the heat energy is transferred to the barrel to achieve the set temperature; the temperature fluctuation index refers to the amplitude, frequency and change rate of the actual temperature of the barrel of the extrusion equipment deviating 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 with time when the set temperature changes in the historical operation of the extrusion equipment; and the temperature conversion attribute refers to the inherent characteristics exhibited when the set temperature is converted into the actual heat of the barrel by the electric heating system in the electric control mode of the extrusion equipment.

[0074] Preferably, in the present embodiment, the temperature holding cycle rule of the extrusion barrel temperature in matching the temperature regulating medium circulation is determined according to the temperature conversion attribute and all temperature control adaptation deviations, and the temperature holding cycle rule is determined according to the temperature conversion attribute and all temperature control adaptation deviations. Figure 3 As shown in the figure, the figure is a flowchart for determining the temperature holding cycle rule in some embodiments of the present application, and the temperature holding cycle rule in the present embodiment can be realized by the following steps:

[0075] In step S31, the dynamic configuration parameters of the temperature regulating medium circulation in each temperature zone of the barrel are determined according to the temperature conversion attribute;

[0076] In step S32, the temperature zone priority weight in the temperature regulating medium circulation distribution is determined according to all dynamic configuration parameters;

[0077] In step S33, the thermal interference conflict index under the coupling effect of the multi-temperature zone of the extrusion barrel is determined;

[0078] In step S34, the temperature holding cycle rule of the extrusion barrel temperature in matching the temperature regulating medium circulation is determined according to the temperature zone priority weight and the thermal interference conflict index.

[0079] In a specific implementation, first, the conversion efficiency, response speed, and stability index of each temperature zone are extracted from the temperature conversion attribute, and the average of the conversion efficiency, response speed, and stability index in all temperature zones is calculated. The calculated average values are used as the dynamic configuration parameters of the temperature control medium circulating in each temperature zone of the barrel. In other embodiments, other methods can be used to determine the dynamic configuration parameters of the temperature control medium circulating in each temperature zone of the barrel, which is not limited here. Next, the medium flow, inlet and outlet temperature difference, and circulation frequency in the dynamic configuration parameters are assigned weights according to importance. The actual value of each dynamic configuration parameter is divided by the maximum value of the parameter in all temperature zones to obtain a standardized value. The comprehensive score of each temperature zone is calculated, which can be calculated using the following formula: comprehensive score = (flow standardized value x 40%) + (temperature difference standardized value x 35%) + (circulation frequency standardized value x 25%). The comprehensive scores of the temperature zones are sorted from high to low, and the sorting result is used as the temperature zone priority weight when the temperature control medium is circulated and distributed. Then, adjacent temperature zone combinations (such as the feeding zone-melt zone, melt zone-homogenization zone, and homogenization zone-head zone) and interval temperature zone combinations (such as the feeding zone-homogenization zone and melt zone-head zone) of the barrel are selected as monitoring objects. Heat interference testing is performed on each combination, that is, the set temperature of a certain temperature zone is increased by 5°C while the other temperature zone parameters are fixed, and the actual temperature change of the affected temperature zone is recorded at the same time. The heat interference conflict index under the coupling effect of the multi-temperature zone of the extrusion barrel is calculated, which can be calculated using the following formula: heat interference conflict index = (actual temperature change of the affected temperature zone ÷ set temperature change of the actively adjusted temperature zone) x 100%. The higher the value of the heat interference conflict index, the stronger the interference. Finally, the medium distribution sequence rule is developed. The temperature control medium can be distributed according to the temperature zone priority weight from high to low to meet the dynamic configuration parameter requirements of the high-priority temperature zone. When the high-priority temperature zone reaches the stable temperature, the remaining medium is distributed to the next high-priority temperature zone. When the actual temperature of a certain 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 amplitude = target temperature deviation x (1 + priority weight of the temperature zone). If the heat interference conflict index of the temperature zone and other temperature zones is > 30% (strong interference), the adjustment opportunity is delayed until the disturbed temperature zone is stable. For temperature zone combinations with a heat interference conflict index < 20% (weak interference), synchronous circulation (adjustment every 30 seconds) can be used. For combinations with an index ≥ 20%, staggered circulation (adjustment alternately every 1 minute) is used. The developed medium distribution sequence rule is used as the temperature holding circulation rule when the temperature of the extrusion barrel is matched with the circulating temperature control medium.

[0080] It should be noted that in the present application, the temperature regulating medium circulation refers to the circulation process of the temperature regulating medium (such as water, heat conducting oil) flowing in the pipelines of each temperature zone of the barrel, and realizing temperature regulation of each temperature zone through heat exchange; the dynamic configuration parameter refers to the temperature regulating medium circulation parameter dynamically adjusted according to the temperature requirement of each temperature zone of the barrel; the temperature zone priority weight refers to the priority value of each temperature zone when distributing the temperature regulating medium when the total amount of the temperature regulating medium is limited; the thermal interference conflict index refers to a parameter quantitatively describing the degree of thermal interference between multiple temperature zones; and the temperature holding circulation rule represents a fixed logic for guiding the circulation of the temperature regulating medium in each temperature zone of the barrel, including the medium distribution sequence, the flow adjustment opportunity, and the circulation interval.

[0081] In the present embodiment, the temperature modification strategy for the extrusion temperature feedback correction can be reliably identified by the temperature holding circulation rule in the following manner, that is:

[0082] The temperature variation elimination constraint for the extrusion temperature feedback correction is determined based on the temperature holding circulation rule;

[0083] The fusion identification information corresponding to the temperature modification strategy for the extrusion temperature feedback correction is generated according to the temperature variation elimination constraint;

[0084] The temperature modification strategy is reliably checked according to the fusion identification information, and a reliably identified temperature modification strategy is obtained.

[0085] In a specific implementation, first, the target temperature range of each temperature zone, the maximum amplitude of the flow adjustment of the temperature adjustment medium, the minimum interval time of two adjacent temperature corrections, and the synchronization adjustment taboo of the thermal interference conflict zone are extracted from the isothermal cycle rule to set the constraint conditions: the single temperature correction amplitude of any temperature zone shall not exceed ±1°C; the temperature change rate shall not exceed 0.2°C / s; 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 isothermal cycle; the temperature correction of the temperature zone combination with a thermal interference conflict index greater than 30% shall not be performed at the same time, and the constraint conditions are set as the temperature change elimination constraints in the extrusion temperature feedback correction. Then, the actual temperature of each temperature zone is collected in real time through the temperature sensor, the execution records of the historical 200 times of temperature correction strategies are extracted from the control system log, and the current temperature change elimination constraint is recorded. The deviation value of the current actual temperature of each temperature zone from the target temperature is calculated, the average deviation elimination rate of the correction strategy similar to the current deviation (such as within ±0.2°C) in the history is counted, whether the currently adopted correction strategy meets the temperature change elimination constraint is judged, a weighted fusion method is used, the comprehensive score (range 0-100 points) is calculated after the standardization of each data, and the higher the score is, the higher the matching degree of the strategy with the actual demand is. The score result is used as the fusion identification information corresponding to the temperature correction strategy in the extrusion temperature feedback correction. Finally, the credible checking standards are set: the comprehensive score of the fusion identification information is greater than or equal to 70 points; the temperature correction strategy meets all the items of the temperature change elimination constraint, and the standard deviation of the deviation elimination rate of the historical similar temperature correction strategy is less than or equal to 5%. Whether the comprehensive score is greater than or equal to 70 points is checked, if not, it is directly determined as untrustworthy; for the temperature correction strategy with a score meeting the standard, whether it meets the temperature change elimination constraint is checked item by item, if one item is violated, it is determined as untrustworthy; for the temperature correction strategy meeting the first two items, the deviation elimination rate data of the historical similar temperature correction strategy are extracted, the standard deviation is calculated, if it is less than or equal to 5%, it is determined as trustworthy, otherwise, it is determined as untrustworthy.

[0086] It should be noted that, in the present application, the extrusion temperature feedback correction refers to the deviation between the actual extrusion temperature and the target temperature detected in real time; the temperature correction strategy refers to a specific adjustment scheme formulated to eliminate the deviation between the extrusion temperature and the target temperature; the temperature change elimination constraint refers to a limitation condition set in the extrusion temperature feedback correction process to ensure that the temperature change can eliminate the deviation smoothly and not cause new temperature fluctuations; the fusion identification information refers to a data set used to verify the effectiveness of the temperature correction strategy; the temperature correction strategy after credible identification refers to a temperature adjustment scheme confirmed by credible checking to meet the constraint conditions, have stable and effective correction effects; and the credible checking refers to a process of verifying whether the temperature correction strategy meets the temperature change elimination constraint, can effectively eliminate the temperature deviation, and has stability.

[0087] The feedback control module 400 is configured to perform cooperative interactive control on the extrusion temperature according to the parallel compensation running guide temperature and the temperature correction strategy after credible identification.

[0088] In the embodiment, the extrusion temperature is specifically controlled according to the running guide temperature after parallel compensation and the temperature correction strategy after reliable identification in a cooperative and interactive manner in the following manner, that is,

[0089] The dynamic interactive entropy in the cooperative and interactive control is determined according to the running guide temperature after parallel compensation and the temperature correction strategy after reliable identification.

[0090] The cooperative feedback weight of the temperature control instruction is generated through the dynamic interactive entropy.

[0091] The final execution temperature of the extrusion temperature cooperative and interactive control is determined through the cooperative feedback weight.

[0092] In the specific implementation, first, the real-time value of the running guide temperature after parallel compensation and the temperature change rate within 1 minute are obtained in real time through the data acquisition system; meanwhile, the adjustment amplitude and adjustment frequency of the temperature correction strategy after reliable identification are extracted. The correlation between the real-time value of the running guide temperature after parallel compensation and the adjustment amplitude of the temperature correction strategy after reliable identification is calculated by using the Pearson correlation coefficient (the value range is -1 to 1), a positive value indicates a positive correlation, a negative value indicates a negative correlation, and the greater the absolute value, the higher the correlation degree. Based on the correlation degree, the entropy value calculation formula is defined as: dynamic interactive entropy = 1 - |correlation coefficient|. When the correlation coefficient is 0.7, the dynamic interactive entropy = 1 - 0.7 = 0.3; if the correlation coefficient is -0.5, the dynamic interactive entropy = 1 - 0.5 = 0.5. The entropy value range is 0-1, and the smaller the value, the better the cooperation (the interaction is more ordered), and the larger the value, the worse the cooperation (the interaction is more chaotic). Then, when the dynamic interactive entropy ≤ 0.3: the running guide temperature after parallel compensation weight (w1) = 0.5, and the temperature correction strategy after reliable identification weight (w2) = 0.5; when 0.3 < dynamic interactive entropy ≤ 0.6: w1 = 0.4, w2 = 0.6 (enhance the influence of the correction strategy, because it is more stable after reliable identification); when the dynamic interactive entropy > 0.6: w1 = 0.3, w2 = 0.7 (further strengthen the dominant position of the correction strategy, and weaken the influence of the guide temperature with poor cooperation). The specific weight value is calculated: if the real-time dynamic interactive entropy is 0.4 (in the interval of 0.3-0.6), w1 = 0.4 and w2 = 0.6 are taken according to the rules; if the entropy value is 0.7, w1 = 0.3 and w2 = 0.7 are taken. The weight value needs to satisfy w1 + w2 = 1. The calculation result is used as the cooperative feedback weight of the temperature control instruction, and finally, the weighted sum formula is used: the final execution temperature = w1 × the running guide temperature after parallel compensation + w2 × the target adjustment value of the temperature correction strategy after reliable identification. The final execution temperature calculated is sent to the temperature control executor (such as a heating rod or a water cooling valve) of the extrusion equipment in real time, the executor is driven to adjust the flow, and the actual temperature of the barrel converges to the value.

[0093] It should be noted that in the present application, the extrusion temperature refers to the target temperature value obtained after the synergistic feedback weighting, which is used to drive the temperature control actuator of the extrusion equipment; the dynamic interaction entropy refers to the parameter quantifying the interaction degree between the running guide temperature after parallel compensation and the temperature correction strategy after reliable identification; the temperature control instruction refers to the target temperature instruction used to drive the temperature control actuator; and the synergistic feedback weight refers to the proportion of the running guide temperature after parallel compensation and the temperature correction strategy after reliable identification in the final control instruction.

[0094] It can be seen that in the present application, precise synergistic control of temperature can be realized in the process of extruding the precise cable sheath. Through obtaining the dynamic temperature information of each heating zone and the temperature control adaptation deviation of each process interval of the extrusion equipment under the same process condition, the temperature dynamic change and process adaptation difference can be fully captured, providing a complete data basis for subsequent temperature control, and effectively improving the perception ability of complex extrusion conditions. By determining the temperature variation dynamic sequence under the closed-loop water circulation mode, analyzing the temperature adjustment hysteresis trend and parallel compensating the running guide temperature, the temperature response can be matched with the diameter change precisely, and the timeliness and foresight of temperature control can be significantly improved. By detecting the temperature conversion attribute under the electric control mode, determining the temperature holding circulation rule and reliably identifying the temperature correction strategy, the reliability of the temperature adjustment medium circulation and the correction strategy can be ensured, invalid or conflicting temperature adjustment can be avoided, and the stability and strategy effectiveness of temperature control can be enhanced. Through synergistic interaction control according to the running guide temperature after parallel compensation and the temperature correction strategy after reliable identification, dynamic and precise temperature regulation can be realized, and the size precision and product quality consistency of the precise cable sheath can be greatly improved.

[0095] In summary, the technical solution adopted in the present application can synergistically optimize the temperature control elements under complex extrusion conditions to improve the processing precision of the precise cable sheath.

[0096] The present application is described with reference to 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 flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to the 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 produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The device that implements the functions specified in one flow or multiple flows and / or blocks Figure 1 The device that implements the functions specified in one flow or multiple flows and / or blocks

[0097] Those skilled in the art can understand that all or part of the steps of various methods in the above embodiments can be completed by instructing the relevant hardware by means of a program, and the program can be stored in a computer readable storage medium, including Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically-Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM) or other optical disk storage, magnetic disk storage, magnetic tape storage, or any other medium that can be used to carry or store data in a computer readable manner.

[0098] It should also be noted that the terms "comprising", "containing", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article, 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 of the extrusion equipment 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. 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. 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. a parallel compensation module for determining a temperature variation fluctuation sequence when the extruder operates in a closed-circuit water circulation mode, determining a temperature adjustment hysteresis trend of the extrusion barrel temperature in response to changes in wire diameter based on the temperature variation fluctuation sequence and all dynamic temperature information, and then performing parallel compensation for the operating guide temperature fed back from the barrel external flow channel during sheath extrusion based on the temperature adjustment hysteresis trend, wherein the closed-circuit water circulation mode refers to an operating mode in which water circulates between the extruder and the temperature control device through a pipeline; 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, determine the temperature station 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 use the temperature station cycle rules to trust the temperature correction strategy during the extrusion temperature feedback correction. The temperature control medium circulation refers to the cyclic process in which the temperature control medium flows through the pipes in each temperature zone of the barrel to achieve temperature regulation in each temperature zone through heat exchange; 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: 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.

3. 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.

4. 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.

5. 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.

6. 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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