Intelligent optimization method and system for plastic particle production process parameters

Abstract

The present application relates to the technical field of process parameter optimization, in particular to a plastic particle production process parameter intelligent optimization method and system, comprising the following steps: arranging particle passage slot timing based on die discharge temperature, cooling water tank inlet and outlet water temperature and traction device linear speed, determining heat exchange promotion state in combination with section temperature change, residence time, flow rate and water temperature relationship, forming flow temperature combination constraint, further adjusting valve opening and inlet water temperature, screening adjustment combination, and outputting control execution instruction. The present application establishes a unified timing relationship along the particle cooling path, arranges multiple measurement point data into a traceable sequence, makes temperature change and flow state form synchronous correspondence, forms a heat exchange promotion relationship along the path based on section division, determines section difference in combination with flow rate and water temperature combination constraint, then screens and sorts the adjustment combination, forms a continuous control output path, and relieves adjustment fluctuation and repeated correction problems.

Description

Technical Field

[0001] This invention relates to the field of process parameter optimization technology, and in particular to intelligent optimization methods and systems for plastic granule production process parameters. Background Technology

[0002] The field of process parameter optimization technology involves the setting, adjustment, and management of parameters for manufacturing processes. It primarily focuses on the acquisition, analysis, modeling, and control of process variables such as temperature, pressure, speed, proportioning, and time. This technology is used to analyze the relationships, patterns of change, and control requirements of parameters during production. It is widely applied in industries such as plastics processing, chemical production, machinery manufacturing, food processing, and pharmaceutical manufacturing. Specifically, intelligent optimization methods for plastic granulation production process parameters refer to the techniques for analyzing and optimizing process parameters involved in extrusion, granulation, cooling, and pelletizing during plastic granulation production. This typically involves processing production data, establishing relationships between parameters, and using data analysis methods and optimization algorithms to adjust and configure various parameters for process parameter setting and control during production.

[0003] Existing technologies in plastic pellet production focus on setting single-point parameters. Temperature, flow rate, and traction speed operate with independent control logic, lacking continuous cross-segment correlation. Although data acquisition covers multiple locations, the time signatures of different measuring points lack unified organization, making it difficult to form a coherent mapping of the pellet's state along the cooling path. Temperature changes and water flow changes within a segment are difficult to match, the cooling process lacks clear segmentation criteria, flow rate and water temperature adjustments rely on local feedback, making it difficult to reflect overall process differences. Imbalances in cooling rhythm between segments are not easily identified, and the adjustment process is prone to multiple repeated corrections. Parameter configurations fluctuate, making it difficult to maintain stable operation. Summary of the Invention

[0004] To address the technical problems existing in the prior art, embodiments of the present invention provide a method and system for intelligent optimization of process parameters in plastic pellet production. The technical solution is as follows: On the one hand, a method for intelligent optimization of process parameters in plastic pellet production is provided, including the following steps: S1: Based on the die head discharge temperature record, obtain the cooling water tank inlet temperature record and outlet temperature record time. Combine the linear velocity of the traction device to determine the particle entry time and exit time. Organize the measurement point time markers according to the order of particles passing through the tank in the same batch to obtain the time sequence correspondence. S2: Based on the time-series correspondence sequence, the transport path is divided into segments, the particle surface temperature change is correlated with the segment residence time, and the heat exchange propulsion sequence of each segment is determined by combining the cooling water inlet temperature, outlet temperature difference and flow rate change. S3: Based on the heat exchange propulsion sequence, correlate the flow state and water temperature state changes of each section, compare the heat exchange performance of the section with the fixed propulsion sequence, determine the insufficient heat exchange section and the excessive heat exchange section, and obtain the flow-temperature combination constraint zone. S4: Based on the flow-temperature combination constraint zone, determine the flow adjustment direction and water temperature adjustment direction of the insufficient heat exchange section, adjust the opening of the electric valve to change the water flow state of the section, compare the heat exchange performance of the section after adjustment, and screen the combination within the outlet set temperature range to obtain the adjustment combination set. S5: Based on the set of adjustment combinations, compare the heat exchange performance and coordination relationship of each combination section, check the corresponding situation of the outlet set temperature, select the combination with the highest matching order of the sections, adjust the flow rate setting and inlet water temperature setting of each section of the cooling water tank, and obtain the control execution command.

[0005] On the other hand, the time-series correspondence sequence includes a batch identifier chain, a measurement point synchronization index, and a travel priority identifier; the heat exchange propulsion sequence includes a section cooling gradient, a heat exchange level along the flow path, and a water-thermal coupling identifier; the flow-temperature combination constraint zone includes a cooling offset zone, a combination matching boundary, and an allowable adjustment range; the adjustment combination set includes a valve position configuration item, a water supply item, and an end-point temperature matching item; and the control execution command includes a section valve position command, a water inlet setting command, and a linkage issuance sequence.

[0006] On the other hand, the steps of the time-series correspondence sequence are as follows: S101: Based on the die head discharge temperature record, analyze the corresponding time with the cooling water tank inlet and outlet water temperature record, compare the order of each measuring point acquisition, determine the time misalignment segment in the same round of acquisition, adjust the order of the die head measuring point and the cooling water tank measuring point, and obtain the measuring point time sequence index set. S102: Based on the time sequence index set of the measuring points, calculate the entry time and exit time of the traction device corresponding to the linear velocity of the traction device, compare the order of particle leaving the mold and passing through the trough, determine the order of particle movement along the trough in the same batch, and obtain the batch passing through the trough sequence. S103: Based on the batch aging sequence, compare the temperature recording intervals corresponding to the entry and exit times of particles in the same batch, adjust the time stamp arrangement order of each measuring point, determine the corresponding position of the batch identifier chain and the synchronization index, and obtain the time sequence correspondence sequence.

[0007] On the other hand, the specific steps of the heat exchange propulsion sequence are as follows: S201: Based on the time sequence correspondence, check the segment position mark and particle movement sequence, match the inlet temperature segment and outlet temperature segment of the same batch of particles, compare the front and back positions along the corresponding time along the conveying path, and obtain the conveying temperature change sequence. S202: Based on the conveying temperature change sequence, retrieve the start and end times of the segment and the travel interval, calculate the surface temperature drop corresponding to the particle residence time, verify the correspondence between residence time and cooling direction, associate the segment residence time with the temperature change range, and obtain the segment cooling correspondence set. S203: Based on the set of corresponding cooling relationships in the section, retrieve the cooling water inlet temperature, outlet temperature and section flow records, compare the changes in water temperature difference and flow rate in the same section, determine the correspondence between particle temperature change and water flow state, screen the heat exchange advancement order of the section, and obtain the heat exchange advancement sequence.

[0008] On the other hand, the specific steps of the flow-temperature combination constraint band are as follows: S301: Based on the heat exchange propulsion sequence, retrieve the inlet water temperature record, outlet water temperature record and flow rate record of each section, check the correspondence between the direction of water temperature change and the flow rate status of the same section according to the section order, associate the flow rate status and water temperature status change of each section, and obtain the section flow temperature correspondence set. S302: Based on the set of corresponding flow temperatures in the sections, call the records of particle surface temperature changes in each section and the corresponding process of the outlet shaping temperature range, compare the heat exchange performance of the sections with the connection relationship of the shaping progress order, determine the location of the insufficient heat exchange section and the location of the excessive heat exchange section, and obtain the section offset data. S303: Based on the section offset data, associate the flow state and water temperature state of each section with their corresponding positions, screen the combination relationship between insufficient heat exchange sections and excessive heat exchange sections, and sort out the corresponding restriction relationship of each section to obtain the flow-temperature combination constraint zone.

[0009] On the other hand, the specific steps of adjusting the combination set are as follows: S401: Based on the flow-temperature combination constraint zone, check the flow state and water temperature state restrictions corresponding to the location of the insufficient heat exchange section, compare the order of inlet water temperature, outlet water temperature and flow rate coordination of each section, determine the direction of flow increase / decrease and water temperature rise / fall of each insufficient heat exchange section, and obtain the flow-temperature adjustment judgment set. S402: Based on the flow temperature adjustment determination set, call the opening position of the electric valve and the water supply passage position of each section, adjust the opening and closing sequence of the valves in the corresponding section, check the connection relationship of the water supply path of each section after the valve position change, determine the result of the change of water supply status of each section, and obtain the valve position water supply mapping table. S403: Based on the valve position water flow mapping table, compare the heat exchange performance after the water flow status changes in each section with the corresponding relationship of the outlet set temperature range, screen the matching position of the section flow state and the inlet water temperature, and sort out the corresponding combination relationship of the outlet temperature state to obtain the adjustment combination set.

[0010] On the other hand, the specific steps of the control execution instruction are as follows: S501: Based on the set of adjustment combinations, check the order of the flow rate status, inlet water temperature status and heat exchange performance of each combination, compare the correspondence between the temperature connection position of each section and the outlet set temperature range, and obtain the section heat connection sequence. S502: Based on the heat connection sequence of the section, associate the heat exchange connection status of adjacent sections within the same combination, calculate the correspondence between the cooling continuity of the front section and the shaping acceptance of the rear section, compare the degree of coordination of the advancement of each combination section, and obtain the combination coordination sequence. S503: Based on the combined coordination sequence, compare the degree of correspondence between the outlet shaping temperature of each combination and the position of the matching order of the sections, screen out the combination with the higher matching order, adjust the flow rate setting and inlet water temperature setting of each section of the cooling water tank, and obtain the control execution command.

[0011] On the other hand, the water outlet temperature record refers to the water temperature record corresponding to the location where the cooling water flows out of the cooling water tank outlet, and the particle entry time refers to the time marker corresponding to the location where the particles enter the cooling water tank inlet.

[0012] On the other hand, the conveying path refers to the movement path of the plastic particles from the inlet position of the cooling water tank to the outlet position, and the segment dwell time refers to the duration corresponding to the particles passing through a single segment.

[0013] On the other hand, an intelligent optimization system for plastic pellet production process parameters is provided. This system is applied to intelligent optimization methods for plastic pellet production process parameters, including: The timing construction module obtains the inlet and outlet water temperature records of the cooling water tank based on the die head discharge temperature record. It combines the linear velocity of the traction device to determine the entry and exit times of the particles into the tank and organizes the time markers of the measuring points according to the order of the particles passing through the tank in the same batch, thus obtaining the timing correspondence sequence. Based on the time-series correspondence sequence, the heat exchange propulsion module divides the transport path into segments, correlates the particle surface temperature change with the segment residence time, and combines the cooling water inlet temperature, outlet temperature difference and flow rate change to determine the heat exchange propulsion sequence of each segment. Based on the heat exchange propulsion sequence, the flow temperature constraint module associates the flow state and water temperature state changes of each section, compares the heat exchange performance of the section with the fixed propulsion sequence, determines the insufficient heat exchange section and the excessive heat exchange section, and obtains the flow temperature combined constraint zone. Based on the flow-temperature combination constraint zone, the adjustment combination module determines the flow adjustment direction and water temperature adjustment direction of the insufficient heat exchange section, adjusts the opening of the electric valve to change the water flow state of the section, compares the heat exchange performance of the section after adjustment, and selects combinations within the outlet set temperature range to obtain the adjustment combination set. Based on the aforementioned set of adjustment combinations, the control output module compares the heat exchange performance and propulsion coordination of each combination section, verifies the corresponding outlet set temperature, selects the combination with the highest matching order, adjusts the flow rate setting and inlet water temperature setting of each section of the cooling water tank, and obtains the control execution command.

[0014] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: By establishing a unified temporal relationship through the continuous changes of particles along the cooling path, multi-point data are integrated into a traceable sequence, enabling synchronous reference between temperature changes and flow state. Based on the segment division, a flow-through heat transfer advancement expression is formed, providing a comparable basis for the cooling process at each location. By constructing a combined constraint relationship between flow rate and water temperature, segment differences have a clear direction for judgment. Combining segment differences to carry out combined screening and adjustment path limitation, the regulation behavior revolves around the overall cooling process, reducing local offset interference. By combining and sorting, a stable control output path is formed, making parameter configuration continuous and consistent, and improving the fluctuations and repeated corrections during the regulation process. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart of the main steps of the present invention; Figure 2 This is a flowchart of steps S1 of the present invention; Figure 3 This is a flowchart of steps S2 of the present invention; Figure 4 This is a flowchart of steps S3 of the present invention; Figure 5 This is a flowchart of step S4 of the present invention; Figure 6 This is a flowchart of steps S5 of the present invention; Figure 7 This is a system block diagram of the present invention. Detailed Implementation

[0017] The technical solution of the present invention will now be described with reference to the accompanying drawings.

[0018] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0019] This invention provides a method for intelligent optimization of process parameters in plastic pellet production, such as... Figure 1 As shown, it includes the following steps: S1: Based on the die head discharge temperature record, analyze the time correspondence between the die head temperature record and the cooling water tank inlet and outlet temperature records, calculate the particle entry and exit times corresponding to the linear velocity of the traction device, determine the correlation between the order of particles passing through the tank in the same batch, adjust the time markers of each measuring point, and obtain the time sequence correspondence. S2: Based on the time-series correspondence sequence, obtain the order of change of particle surface temperature along the conveying path in each section, calculate the temperature change amplitude corresponding to the residence time of the section, compare the flow rate change of the temperature difference between the cooling water inlet temperature and the outlet temperature, determine the correspondence between the temperature change of the section and the water flow state, screen the heat exchange propulsion sequence of the section, and obtain the heat exchange propulsion sequence. S3: Based on the heat exchange propulsion sequence, obtain the water temperature state change corresponding to the flow state of each section, compare the heat exchange performance of the section with the fixed propulsion sequence, determine the location of insufficient heat exchange section and excessive heat exchange section, filter the water temperature state combination relationship corresponding to the flow state of the section, organize the section constraints, and obtain the flow-temperature combination constraint zone. S4: Based on the flow-temperature combination constraint zone, determine the flow adjustment direction and water temperature adjustment direction of the insufficient heat exchange section, adjust the opening of the electric valve, change the water flow state of the section, compare the heat exchange performance of the section after the flow change, screen the combination within the outlet set temperature range, and obtain the set of adjustment combinations. S5: Based on the set of adjustment combinations, obtain the sequence of heat exchange performance of each section, calculate the coordination relationship of each combination of sections, compare the degree of correspondence of outlet set temperature of each combination, screen the combination with the highest matching sequence of sections, and adjust the flow rate setting and inlet water temperature setting of each section of the cooling water tank to obtain the control execution command.

[0020] The time-series correspondence sequence includes batch identifier chain, measurement point synchronization index and travel priority identifier; the heat exchange propulsion sequence includes section cooling gradient, heat exchange level along the process and water-heat coupling identifier; the flow-temperature combination constraint zone includes cooling offset zone, combination matching boundary and regulation allowable range; the regulation combination set includes valve position configuration item, water supply item and terminal temperature matching item; the control execution command includes section valve position command, water inlet setting command and linkage issuance sequence.

[0021] In S1, the die head temperature record refers to the temperature record of the molten plastic surface corresponding to the outlet position of the extruder die head; the inlet water temperature record refers to the water temperature record corresponding to the inlet position of the cooling water entering the cooling water tank; the outlet water temperature record refers to the water temperature record corresponding to the outlet position of the cooling water flowing out of the cooling water tank; the traction device linear speed refers to the linear running speed of the traction device along the particle conveying direction; the particle entry time refers to the time mark corresponding to the particle entering the cooling water tank inlet position; the exit time refers to the time mark corresponding to the particle leaving the cooling water tank outlet position; the sequence association of passing through the tank refers to the sequential passing relationship of particles of the same batch along the cooling water tank conveying direction; the measuring point time mark refers to the acquisition time mark corresponding to each temperature sensor, flow sensor, and position detection unit.

[0022] In S2, each section refers to a continuous segment of the cooling water tank along the particle conveying direction; the conveying path refers to the movement path of the plastic particles from the inlet to the outlet of the cooling water tank; the section residence time refers to the duration of time the particles pass through a single section; the temperature change amplitude refers to the change in surface temperature of the particles between the inlet and outlet of the same section; the flow rate change refers to the change in volumetric flow rate of the cooling water in the corresponding time period or section; the water-side flow state refers to the flow distribution of the cooling water in the cooling water tank or circulating water pipeline; and the section heat exchange progression order refers to the sequence of heat exchange during the cooling process of the particles along each section.

[0023] In S3, the flow rate status of each section refers to the distribution of cooling water flow rate in each section; the heat transfer performance of each section refers to the heat transfer situation corresponding to the changes in particle surface temperature, water temperature, and flow rate in each section; the shaping and propulsion sequence refers to the order in which particles change from the initial hot state to the outlet shaping state along the cooling path; the insufficient heat transfer section refers to the section where the cooling process of particles is slower than the preset shaping process in the corresponding section; the excessive heat transfer section refers to the section where the cooling process of particles is faster than the preset shaping process in the corresponding section; the water temperature state combination relationship refers to the coordination relationship between the cooling water inlet temperature, outlet temperature, and corresponding flow rate; and the section constraint refers to the corresponding restriction relationship between the flow rate status, water temperature status, and shaping and propulsion state in a single section.

[0024] In S4, the flow rate adjustment direction refers to the direction of flow rate increase or decrease determined by the water flow situation in the corresponding section; the water temperature adjustment direction refers to the direction of inlet water temperature increase or decrease determined by the cooling situation in the corresponding section; the section water flow status refers to the water supply and flow status of cooling water in the corresponding section; and the combination within the outlet shaping temperature range refers to the flow rate and water temperature combination corresponding to the outlet temperature being within the preset shaping temperature range when the particles leave the cooling water tank.

[0025] In S5, the segment progression order refers to the sequential arrangement of the cooling processes of each segment; the progression coordination relationship refers to the connection relationship between the cooling processes of each segment; and the degree of correspondence refers to the proximity relationship between the outlet temperature and the preset temperature range.

[0026] like Figure 2 As shown, the specific steps of the time-series correspondence sequence are as follows: S101: Based on the die head discharge temperature record, analyze the corresponding time with the cooling water tank inlet and outlet water temperature record, compare the order of each measuring point acquisition, determine the time misalignment segment in the same round of acquisition, adjust the order of the die head measuring point and the cooling water tank measuring point, and obtain the measuring point time sequence index set. First, the data collection records from three measuring points—the mold head outlet, cooling water tank inlet, and cooling water tank outlet—during the same production period are sequentially arranged in seconds. Continuous records can be extracted within the workshop at a frequency of once every 0.5 seconds. For example, at 10 seconds, the mold head temperature is 210℃, the inlet water temperature is 24℃, and the outlet water temperature is 31℃; at 10.5 seconds, the mold head temperature is 209℃, the inlet water temperature is 24.2℃, and the outlet water temperature is 31.4℃. Then, the order of the records from the three measuring points is checked one by one. First, check if the timestamps are reversed; then check if any measuring point arrives more than 1 second late in the same round of data collection. Set 1 second as the misalignment judgment threshold; this value can be based on a sensor response delay of 0.2 seconds. The communication delay of 0.3 seconds and the buffer fluctuation of 0.5 seconds are accumulated sequentially. When the inlet or outlet measuring point is offset from the mold head measuring point by more than 1 second, the record segment is listed as a misaligned segment. Then, the time stamps in the segment are rearranged in chronological order, and the corresponding temperature value is also shifted to the rearranged time position. For example, if the mold head is 10 seconds away but the inlet is recorded at 11.5 seconds, the inlet record is moved forward to the corresponding acquisition round near 10 seconds. Then, the next set of records is checked until there are no misaligned items exceeding 1 second in the continuous records. Finally, the correspondence between the mold head, inlet, and outlet measuring points in each acquisition round is organized into a unified index order to obtain a measuring point time sequence index set that can be called later.

[0027] S102: Based on the timing index set of measuring points, calculate the entry and exit times of the traction device corresponding to the linear velocity of the traction device, compare the order of particle departure from the mold and passing through the trough, determine the order of particle movement along the trough in the same batch, and obtain the batch passing through the trough sequence. Substituting the relationship between the linear velocity of the traction device and the equipment position into the specific travel process, first read the actual linear velocity of the current production line, for example, 0.6 meters per second. Then read the distance from the die head to the water tank inlet, 0.6 meters, and the effective tank length, 3 meters. Based on this, we first obtain that it takes approximately 1 second for the particles to travel from the die to the tank, and then approximately 5 seconds for the particles to travel from the tank to the outlet. Then, using each die head record as a starting point, we extrapolate the approximate time for the particles to enter and leave the water tank. For example, if the die head records 208°C at 20 seconds, then the corresponding entry time for that batch of particles is recorded as 21 seconds, and the exit time as 26 seconds. Next, we compare 21 seconds and 26 seconds with the actual sampling times at the inlet and outlet. If the difference between the inlet or outlet record and the extrapolated time does not exceed 0... If the time is 0.8 seconds, it is directly identified as the corresponding record of the same batch of particles. The 0.8-second limit can be calculated based on a 5% fluctuation in production line speed, a 0.1-meter measurement point installation error, and a 0.5-second sampling step. If it exceeds 0.8 seconds, the search continues to the adjacent records before and after, and the one with the smallest deviation is selected as the matching result. After completing the matching of the entry and exit of each batch of particles, the exit order of each batch of particles is compared. For example, if the first batch corresponds to exiting the tank at 26 seconds and the second batch corresponds to exiting the tank at 26.5 seconds, the first batch is placed before the second batch. If a later batch exits the tank earlier, it is marked as an abnormal order and the batch arrangement is readjusted. Finally, a batch passing through the tank in sequence is formed according to the actual order of passing through the tank.

[0028] S103: Based on the batch-to-tank sequence, compare the temperature recording intervals corresponding to the entry and exit times of particles in the same batch, adjust the order of time markers at each measuring point, determine the corresponding position of the batch identifier chain and the synchronization index, and obtain the time sequence correspondence. For each batch of particles, relevant temperature records are extracted from the time they enter the water tank until they leave the tank. The die head record, inlet water temperature record, and outlet water temperature record are then compared within the same time frame. For example, if a batch of particles enters the tank at 31 seconds and leaves at 36 seconds, the inlet and outlet water temperature records are extracted between 31 and 36 seconds. Simultaneously, the die head temperature record at the time the batch of particles leaves the mold is extracted one second earlier. These three sets of records are then re-merged and sorted according to time. If all three measurement points have records at a given moment, a direct correspondence is established based on that moment. If a measurement point record is missing at a given moment, adjacent records are used to fill the gap. For example, the die head temperature is missing at 32 seconds, but is 20 at 31.5 seconds. If 6℃ and 32.5 seconds equal 202℃, then the temperature at 32 seconds is set to 204℃. This ensures that the time chain of the same batch of particles remains unbroken throughout the entire process of passing through the tank. Then, the batch number of the particles is bound to each synchronous time position one by one to check if there are two batches corresponding to the same synchronous position. If an overlap is found, the batch that ranks earlier in the tank passage sequence is retained first, and the corresponding record of the next batch is carried over to the next synchronous position. This check is repeated until only one batch correspondence is retained for each synchronous position. Finally, the batch identifier, synchronous position, and order of movement along the tank are organized into a unified sequence to obtain a time sequence correspondence that can be directly used for subsequent section heat transfer analysis.

[0029] like Figure 3 As shown, the specific steps of the heat exchange propulsion sequence are as follows: S201: Based on the time-series correspondence sequence, check the segment position mark and particle movement sequence, match the inlet temperature segment and outlet temperature segment of the same batch of particles, compare the front and back positions along the corresponding time along the conveying path, and obtain the conveying temperature change sequence. Read the batch identifier chain, synchronization index, and travel sequence identifier corresponding to the same batch of particles. Then, divide the cooling water tank into front, middle-front, middle-rear, and final sections along the conveying direction. Compare the position markers of each section with the position records corresponding to the batch of particles at each synchronization moment. For example, if the 8th batch of particles is located at the front section entrance at 41 seconds, the middle-front section entrance at 42.2 seconds, the middle-rear section entrance at 43.5 seconds, and the final section entrance at 44.7 seconds, check whether the position numbers are consecutively increasing according to the time sequence. If 43.5 seconds is still marked as the front section, compare this record with the adjacent position records within 0.5 seconds before and after, rearrange them, and then extract the corresponding temperature record from the batch of particles. Temperature segments from the inlet and outlet sides of each section are extracted. The interval before and after the extraction is defined as the same segment. For example, if the inlet time of the middle-front section corresponds to 186℃ and the outlet time of the middle-front section corresponds to 171℃, then 186℃ is recorded as the inlet segment of that section, and 171℃ is recorded as the outlet segment of that section. Subsequently, the corresponding segments of the middle-rear and final sections are organized sequentially, and the segments of each section are sorted according to the transport direction. If it is found that the time increases but the segment number jumps, the synchronous records in the missing interval are checked and the missing temperature segments are added. Finally, the inlet segments, outlet segments, and positional order of the same batch of particles from the front to the end are written into a unified sequence table to obtain the transport temperature change sequence.

[0030] S202: Based on the conveying temperature change sequence, retrieve the start and end times of the segment and the travel interval, calculate the surface temperature drop corresponding to the particle residence time, verify the correspondence between residence time and cooling direction, associate the segment residence time with the temperature change range, and obtain the segment cooling correspondence set. The entry and exit times of each batch of particles, along with the corresponding segment numbers, are retrieved. The completeness of the travel intervals is then checked according to the sequence of segments. For example, if the entry time of the 8th batch of particles in the early-middle section is 42.2 seconds and the exit time is 43.5 seconds, and in the late-middle section it is 43.5 seconds and the exit time is 44.7 seconds, then the dwell time in each segment is calculated: 1.3 seconds for the early-middle section and 1.2 seconds for the late-middle section. Next, the entry and exit temperatures of the corresponding segments are read, and the temperature drop is directly calculated. For example, if the entry temperature in the early-middle section is 186℃ and the exit temperature is 171℃, the result is 15℃; if the entry temperature in the late-middle section is 171℃ and the exit temperature is 159℃, the result is 12℃. Then, the dwell time is checked segment by segment. To verify whether the dwell time and cooling direction are consistent, first check if the outlet temperature is lower than the inlet temperature. If the inlet temperature is 168℃ and the outlet temperature is 170℃, then check the supplementary temperature records within 0.5 seconds before and after. If the decreasing relationship is still not satisfied after the check, mark the segment as an anomaly. Then, register the dwell time and cooling amplitude accordingly. When registering, less than 1 second is classified as a short period, 1 to 1.5 seconds as a medium period, and more than 1.5 seconds as a long period. Less than 5℃ is classified as a small drop, 5℃ to 12℃ as a medium drop, and more than 12℃ as a large drop. For example, 1.3 seconds corresponding to 15℃ is recorded as a medium period corresponding to a large drop. Finally, summarize the corresponding results of multiple batches according to the segment number to obtain the segment cooling amplitude correspondence set.

[0031] S203: Based on the section cooling correspondence set, retrieve the cooling water inlet temperature, outlet temperature and section flow record, compare the water temperature difference change and flow change in the same section, determine the correspondence between particle temperature change and water side flow state, screen the section heat exchange advancement order, and obtain the heat exchange advancement sequence. Retrieve the inlet water temperature, outlet water temperature, and flow rate records for the corresponding time period according to the section number. Then, compare the temperature drop record of the particles within that section with the water-side record within the same time window item by item. For example, if the time for the 8th batch of particles to pass through the middle section is 42.2 seconds to 43.5 seconds, the inlet water temperature in this section is 24℃, the outlet water temperature is 29℃, the flow rate is 18 liters per minute, and the particle surface temperature drops from 186℃ to 171℃, first record the water temperature difference as 5℃. Then continue to read the records of the 9th and 10th batches in the same section. For example, the 9th batch corresponds to an inlet temperature of 24℃, an outlet temperature of 30℃, a flow rate of 20 liters per minute, and a particle temperature drop of 16℃, while the 10th batch corresponds to an inlet temperature of 25℃, an outlet temperature of 29℃, and a flow rate of 16 liters per minute. The flow rate is 12°C per minute, and the temperature drop of particles is 12°C. Then, the direction of change of water temperature difference and the direction of change of flow rate are compared within the same section. If both increase simultaneously and the temperature drop of particles also increases, it is recorded as a state of the same direction. If the flow rate increases but the water temperature difference decreases and the temperature drop of particles decreases, it is recorded as a state of opposite direction. Then, the flow rate state and water temperature difference state are divided into intervals. Less than 12 liters per minute is recorded as low flow rate, 12 to 20 liters per minute is recorded as medium flow rate, and more than 20 liters per minute is recorded as high flow rate. Less than 3°C is recorded as low temperature difference, 3 to 6°C is recorded as medium temperature difference, and more than 6°C is recorded as high temperature difference. Then, the state combinations appearing in each section and the particle temperature drop records are sorted segment by segment. The segments with stable corresponding relationships in consecutive batches are prioritized to obtain the heat exchange propulsion sequence.

[0032] like Figure 4 As shown, the specific steps for the flow-temperature combination constraint band are as follows: S301: Based on the heat exchange propulsion sequence, retrieve the inlet water temperature record, outlet water temperature record and flow rate record of each section, check the correspondence between the direction of water temperature change and the flow rate status of the same section according to the section sequence, associate the flow rate status and water temperature status change of each section, and obtain the section flow temperature correspondence set. Read the inlet and outlet water records and branch flow records for the first, middle, middle-rear, and final sections in sequence during the same batch. Then, pair the inlet and outlet water temperatures for each section by time, checking each record to see if the water temperature is rising, remaining constant, or falling. Compare this trend with the flow rate of that section in the same record. In actual production, the following can be used: first section: inlet 24℃, outlet 28℃, flow rate 19 liters per minute; middle-front section: inlet 24℃, outlet 30℃, flow rate 20 liters per minute; middle-rear section: inlet 25℃, outlet 29℃, flow rate 16 liters per minute; final section: inlet 25℃, outlet 27℃, flow rate 21 liters per minute. Then, compare the water temperature difference and flow rate within each section in sequence to see if they change synchronously. Less than 12 liters per minute is recorded as low flow rate, 12 to 20 liters per minute as medium flow rate, and more than 20 liters per minute as high flow rate. Temperature difference less than 3°C is recorded as low temperature difference, 3 to 6°C as medium temperature difference, and more than 6°C as high temperature difference. In the above example, the first segment corresponds to medium flow rate and medium temperature difference, the middle segment to medium flow rate and high temperature difference, the middle and later segments to medium flow rate and medium temperature difference, and the last segment to high flow rate and low temperature difference. If the state is consistent in three consecutive batches of records for the same segment, it is retained as a stable correspondence. If the flow rate increases but the temperature difference decreases by more than 2°C between two consecutive batches, it is recorded as a deviation and marked separately. Finally, the flow rate and water temperature changes of each segment are organized into a continuous correspondence table according to the segment number and sequence, resulting in a set of flow-temperature correspondences for each segment.

[0033] S302: Based on the section flow temperature correspondence set, call the particle surface temperature change records of each section and the corresponding process of the outlet shaping temperature range, compare the heat exchange performance of the section with the shaping progress sequence, determine the location of insufficient heat exchange section and excessive heat exchange section, and obtain section offset data. Retrieve the temperature change records of the particles at the inlet and outlet positions for each section. Then, compare the preset shaping temperature range at the outlet of the cooling water tank with the cooling process of the particles segment by segment. In practice, the outlet shaping temperature range can be set to 148℃ to 154℃, where below 148℃ is recorded as the undercooled section, 148℃ to 154℃ as the adaptation section, and above 154℃ as the incomplete section. Then, check whether the particle surface temperature is consistent with the expected progress rhythm of each section from the beginning to the end. For example, for a batch of particles, the temperature drops from 205℃ to 188℃ in the first section, from 188℃ to 170℃ in the middle section, from 170℃ to 158℃ in the middle and later sections, and from 158℃ to 158℃ in the last section. If the temperature reaches 51℃, the final section enters the shaping range. If another batch of particles reaches 157℃ at the final section, the final section is marked as a position with insufficient heat exchange. If the temperature in the middle and later sections has dropped to 149℃ and the final section continues to drop to 143℃, the boundary between the middle and later sections and the final section is marked as a position with excessive heat exchange. When making the judgment, the connection between the previous and the next section is checked. If the temperature difference between two adjacent sections is greater than 8℃, it is recorded as a significant advance deviation. If the difference is between 3℃ and 8℃, it is recorded as a moderate advance deviation. If the difference is less than 3℃, it is recorded as a slight advance deviation. Finally, the insufficient and excessive positions and the corresponding deviation levels of each section are written into the section sequence table to obtain the section deviation data.

[0034] S303: Based on the section offset data, associate the flow status and water temperature status of each section with their corresponding positions, screen the combination relationship between insufficient heat exchange sections and excessive heat exchange sections, and sort out the corresponding restriction relationship of each section to obtain the flow-temperature combination constraint zone. List the marked insufficient and excessive heat exchange locations in each section alongside the corresponding flow rate and water temperature status. Then, check for continuous or opposite offsets between sections following the heat exchange progression sequence. In practice, the first and middle sections can be recorded as medium flow rate with high temperature difference and deemed normal; the middle and later sections as medium flow rate with medium temperature difference and deemed insufficient; and the last section as high flow rate with low temperature difference and deemed excessive. First, check if the insufficient and excessive sections are adjacent. If they are, group them together and check if the flow rate difference is greater than 3 liters per minute and the temperature difference is greater than 2°C. If both conditions are met, retain the group; otherwise, leave the group unchecked. Then, continue to search for the next set of offset segments forward or backward for re-pairing. Subsequently, a restriction registration is formed for each segment. If a low flow segment also corresponds to a high outlet temperature, it is listed as a flow lower limit restricted area. If a medium flow segment corresponds to a fixed shape close to the interval boundary, it is listed as a fine adjustment area. If a high flow segment corresponds to a low temperature difference and the outlet temperature is below 148℃, it is listed as a pullback area. Then, the restriction relationship is continuously expanded according to the segment position to form a banded distribution in which the first section allows maintenance, the middle and first section allows a small increase in flow, the middle and last section allows an increase in flow and a reduction in the inlet water temperature within 1℃, and the last section restricts continued increase in flow. Finally, the matching position and restriction boundary order of each segment are sorted to obtain the flow temperature combination constraint zone.

[0035] like Figure 5 As shown, the specific steps for adjusting the combined set are as follows: S401: Based on the flow-temperature combination constraint zone, check the flow state and water temperature state restrictions corresponding to the location of the insufficient heat exchange section, compare the order of inlet water temperature, outlet water temperature and flow in each section, determine the direction of flow increase / decrease and water temperature rise / fall in each insufficient heat exchange section, and obtain the flow-temperature adjustment judgment set. Identify the marked insufficient heat exchange locations in each section and extract the corresponding flow rate range and water temperature limit range for that section. Then, arrange the current inlet water temperature, outlet water temperature, and flow rate records for that section item by item. For example, if the record for the middle and later sections is an inlet water temperature of 25℃, an outlet water temperature of 29℃, and a flow rate of 16 liters per minute, and it is marked as insufficient heat exchange, first compare the current flow rate of that section with the allowable range in the constraint zone. If the allowable flow rate range for that section in the constraint zone is 18 to 22 liters per minute, then calculate the difference between the current 16 liters per minute and the lower limit of 18, obtaining a difference of 2 liters per minute. Next, check the inlet water temperature with the corresponding water temperature range in the constraint zone. If the allowable inlet water temperature is 23℃ to 25℃, then the current 25℃ is at the upper limit. Then continue to compare this section with the previous section. The water temperature and flow rate of the next section are arranged in order. For example, if the previous section is 20 liters per minute corresponding to 28℃ and the next section is 21 liters per minute corresponding to 27℃, then the current state of the middle and later sections is compared with the state of the adjacent sections one by one. If the flow rate is lower than that of the adjacent section but the temperature is higher than that of the adjacent section, then the flow rate adjustment direction of that section is marked as upward and the water temperature adjustment direction is marked as downward. At the same time, a judgment threshold is set: if the flow rate difference is greater than 1.5 liters per minute, it is judged that adjustment is needed; if the water temperature difference is greater than 1℃, it is judged that adjustment is needed. If the difference does not reach the threshold, the original state remains unchanged. Then, the same operation is performed on all sections with insufficient heat exchange. The flow rate adjustment direction and water temperature adjustment direction of each section are recorded as a pair of pointing data and arranged in the order of section number to obtain the flow and temperature adjustment judgment set.

[0036] S402: Based on the flow temperature adjustment judgment set, call the opening position of the electric valve and the water supply passage position of each section, adjust the opening and closing sequence of the valve in the corresponding section, check the connection relationship of the water supply path of each section after the valve position change, determine the result of the change of water supply status of each section, and obtain the valve position water supply mapping table. Obtain the current opening position of the electric valves in each section and the corresponding water supply circuit number. For example, if the current opening of the valve in the middle and later sections is 45% and the water supply circuit number is branch 2, then based on the flow rate adjustment direction of this section, set the valve opening target to 55%, and adjust the opening in a step-by-step manner, with each adjustment increment set to 5%. That is, adjust from 45% to 50%, pause for 2 seconds, and then adjust from 50% to 55%. After each adjustment, read the real-time flow rate change value of this section, for example, from 16 liters per minute to 18 liters per minute, and then to 20 liters per minute. At the same time, record the inlet water temperature change at the corresponding time point, for example, from 25℃ to 24.5℃. The temperature is then lowered to 24℃. The adjusted water supply path of this section is then checked against the paths of adjacent sections. For example, if the middle and later sections are connected to the end section by branch 3 after adjustment from branch 2, the flow difference at the junction of the two branches is checked to see if it exceeds 2 liters per minute. If it does, it is recorded as a discontinuity of the path and fine-tuned. The valve opening of this section is adjusted back by 2% until the flow difference between adjacent sections is controlled within 2 liters per minute. The valve opening is then adjusted in the same way for all sections. The flow value, water temperature value and path number change before and after the adjustment are recorded one by one. The valve position change of each section and the corresponding water path status are compiled into a correspondence table to obtain the valve position water flow mapping table.

[0037] S403: Based on the valve position water flow mapping table, compare the heat exchange performance and the corresponding relationship between the water flow state changes of each section and the outlet set temperature range, screen the matching position of the section flow state and the inlet water temperature, and sort out the corresponding combination relationship of the outlet temperature state to obtain the set of adjustment combinations. The adjusted flow rate, inlet water temperature, and corresponding particle surface temperature changes are read segment by segment. Then, the temperature drop of each batch of particles in each segment is compared with the outlet set temperature range. For example, if a batch of particles has an adjusted flow rate of 20 liters per minute and an inlet water temperature of 24°C in the middle and later stages, with the particle temperature dropping from 170°C to 155°C, and an inlet water temperature of 23.5°C in the final stage, with the particle temperature dropping from 155°C to 150°C, then the outlet temperature of 150°C is compared with the preset set temperature range of 148°C to 154°C. If it falls within this range, the combination is marked as valid, and the process continues for the next segment. The same comparison is performed on batches of particles. For example, if another batch drops to 147°C at the end, it is recorded as below the range and excluded. Then, all section combinations are screened. When screening, the combination retention condition is set as follows: the outlet temperature of two or more consecutive batches is within the range of 148°C to 154°C and the temperature drop difference between sections does not exceed 5°C. Then, the combinations that meet the conditions are arranged in order by section number. For example, the flow rate of 19 liters per minute in the middle and front section is matched with an inlet temperature of 24°C, the flow rate of 20 liters per minute in the middle and rear section is matched with an inlet temperature of 24°C, and the flow rate of 21 liters per minute in the final section is matched with an inlet temperature of 23.5°C. This combination is recorded as a complete configuration. Then, all valid combinations are compiled into a list to form a set of adjustment combinations.

[0038] like Figure 6 As shown, the specific steps for controlling the execution of instructions are as follows: S501: Based on the set of adjustment combinations, check the order of the flow rate status, inlet water temperature status and heat exchange performance of each combination, compare the correspondence between the temperature connection position of each section and the outlet set temperature range, and obtain the section heat connection sequence. Each candidate combination is expanded in the order of front section, middle front section, middle rear section, and final section. The corresponding flow rate, inlet water temperature, and particle surface temperature change records are read item by item. These records are then compared segment by segment with the heat exchange progression sequence established previously. Combination A can be used as an example: Front section flow rate 19 L / min, inlet water temperature 24.5℃, particle temperature drops from 205℃ to 188℃; Middle front section flow rate 20 L / min, inlet water temperature 24℃, particle temperature drops from 188℃ to 171℃; Middle rear section flow rate 20 L / min, inlet water temperature 24℃, particle temperature drops from 171℃ to 156℃; Final section flow rate 21 L / min, inlet water temperature 23.5℃, particle temperature drops from 156℃ to 151℃. The results are then checked segment by segment. For temperature connection positions, first check whether the outlet temperature of the previous section and the inlet temperature of the next section are consistent under the condition of continuous movement of the same batch of particles. If the outlet temperature of the previous section is 188℃ and the inlet temperature of the middle section is 188℃, it is recorded as a direct connection. If the outlet temperature of the previous section is 188℃ and the inlet temperature of the middle section is recorded as 184℃, then retrieve the supplementary record within the adjacent 0.5 seconds for further verification. If there is still a difference of more than 3℃ after the supplementary check, it is recorded as a connection offset. Then, compare the outlet temperature of the last section with the shaping range of 148℃ to 154℃ item by item. If it is within the range, it is recorded as the shaping corresponding position. If it is below 148℃, it is recorded as the advanced position. If it is above 154℃, it is recorded as the lagging position. Finally, organize the temperature connection positions, offsets and outlet corresponding positions of each combination from the front section to the last section in order to obtain the segment thermal connection sequence.

[0039] S502: Based on the segment heat connection sequence, associate the heat exchange connection status of adjacent segments within the same combination, calculate the correspondence between the cooling continuity of the front segment and the shaping acceptance of the rear segment, compare the degree of coordination of the advancement of each combination segment, and obtain the combination coordination sequence. Within the same combination, extract the thermal connection status between adjacent sections sequentially, and then check the cooling continuity of the previous section against the shaping connection of the next section one by one. Taking combination A as an example, if the front section cools by 17℃, the middle section by 17℃, the middle and rear section by 15℃, and the final section by 5℃, first check if the outlet temperature of the front section (188℃) is continuous with the inlet temperature of the middle section (188℃). Then check if the outlet temperature of the middle section (171℃) is continuous with the inlet temperature of the middle and rear section (171℃). If the temperature difference between the beginning and end of two adjacent sections does not exceed 2℃, it is considered continuous connection. A difference between 2℃ and 5℃ is considered a slight deviation, and a difference exceeding 5℃ is considered a severe deviation. Then check if the cooling result of the front section is smoothly connected to the connection position of the rear section. For example, if the outlet temperature of the middle section is 171℃ after cooling, and the inlet temperature of the middle and rear section is... If the temperature at the outlet is still around 171℃, it is considered a successful connection. If the temperature at the outlet of the middle and front section is still around 178℃ while the temperature at the inlet of the middle and rear section has fallen below 165℃, it is considered a jump in the advance section. Then, the connection status of the final section is checked together with the outlet shaping interval. If the outlet of the middle and rear section is 156℃ and the outlet of the final section is 151℃, it is considered that the connection has entered the shaping interval. If the outlet of the middle and rear section is 150℃ and the outlet of the final section is 145℃, it is considered that the connection has crossed the shaping interval. Then, the number of consecutive connection sections, the number of light offset sections, and the number of heavy offset sections are counted for each combination. Three consecutive connection sections are considered high coordination, two consecutive connection sections without heavy offset are considered medium coordination, and the rest are considered low coordination. Finally, the continuity of the front section, the connection status of the rear section, and the coordination level are sorted according to the combination number to obtain the combination coordination sequence.

[0040] S503: Based on the combined coordination sequence, compare the degree of correspondence between the outlet temperature of each combination and the position of the matching order of the sections, screen out the combination with the earlier matching order, adjust the flow rate setting and inlet water temperature setting of each section of the cooling water tank, and obtain the control execution command. The coordination level of each combination is recorded alongside the corresponding final outlet temperature. Then, the final outlet temperature is compared item by item with a preset range of 148℃ to 154℃. First, it is checked whether the outlet temperature falls within the range. Then, its deviation from the range center value of 151℃ is checked. A deviation of no more than 1℃ is recorded as a priority position, a deviation of 1℃ to 2℃ is recorded as a secondary priority position, a deviation of more than 2℃ but still within the range is recorded as a reserved position, and those exceeding the range are directly listed as subsequent positions. This result is then checked against the order of segment matching. If a combination has a high coordination level and a final outlet temperature of 151℃, and there are no skips in the thermal connection sequence from the beginning to the end, then this combination is ranked first. If another combination has an outlet temperature of 150℃ but there is a slight deviation in the middle or later stages, then it is ranked later. If the combined outlet temperature is 154℃ and the coordination level is only medium, it is listed in the subsequent positions. Then, the final flow rate setting and inlet water temperature setting of each section are extracted from the top-ranked combinations. For example, the optimal combination corresponds to a flow rate of 19 liters per minute and an inlet water temperature of 24.5℃ in the front section, a flow rate of 20 liters per minute and an inlet water temperature of 24℃ in the middle section, a flow rate of 20 liters per minute and an inlet water temperature of 24℃ in the middle and rear sections, and a flow rate of 21 liters per minute and an inlet water temperature of 23.5℃ in the final section. Then, the setting values ​​are written into the control output table according to the section and simultaneously written into the linkage output order. During execution, the front section and the middle section are sent first, then the middle and rear sections are sent, and finally the final section is sent. If the flow rate difference between adjacent sections exceeds 2 liters per minute, a first-level transition setting is added to the instruction. Finally, the control execution instruction is formed.

[0041] like Figure 7 As shown, the intelligent optimization system for plastic pellet production process parameters includes: The timing construction module obtains the inlet and outlet water temperature records of the cooling water tank based on the die head discharge temperature record. It combines the linear velocity of the traction device to determine the entry and exit times of the particles into the tank and organizes the time markers of the measuring points according to the order of the particles passing through the tank in the same batch, thus obtaining the timing correspondence sequence. The heat exchange propulsion module is based on the time-series correspondence sequence, divides the transport path into sections, associates the particle surface temperature change with the residence time of the section, and combines the cooling water inlet temperature, outlet temperature difference and flow rate change to determine the heat exchange propulsion sequence of each section. The flow-temperature constraint module is based on the heat exchange propulsion sequence, associates the flow state and water temperature state changes of each section, compares the heat exchange performance of the section with the fixed propulsion sequence, and judges the insufficient heat exchange section and the excessive heat exchange section to obtain the flow-temperature combined constraint zone. The adjustment combination module is based on the flow-temperature combination constraint zone to determine the flow adjustment direction and water temperature adjustment direction of the insufficient heat exchange section. It adjusts the opening of the electric valve to change the water flow state of the section, compares the heat exchange performance of the section after adjustment, and selects combinations within the outlet set temperature range to obtain the adjustment combination set. The control output module is based on the set of adjustment combinations. It compares the heat exchange performance and coordination relationship of each combination section, checks the corresponding outlet set temperature, selects the combination with the highest matching order of the sections, adjusts the flow rate setting and inlet water temperature setting of each section of the cooling water tank, and obtains the control execution command.

[0042] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for intelligent optimization of process parameters in plastic pellet production, characterized in that, The method includes: S1: Based on the die head discharge temperature record, obtain the cooling water tank inlet temperature record and outlet temperature record time. Combine the linear velocity of the traction device to determine the particle entry time and exit time. Organize the measurement point time markers according to the order of particles passing through the tank in the same batch to obtain the time sequence correspondence. S2: Based on the time-series correspondence sequence, the transport path is divided into segments, the particle surface temperature change is correlated with the segment residence time, and the heat exchange propulsion sequence of each segment is determined by combining the cooling water inlet temperature, outlet temperature difference and flow rate change. S3: Based on the heat exchange propulsion sequence, correlate the flow state and water temperature state changes of each section, compare the heat exchange performance of the section with the fixed propulsion sequence, determine the insufficient heat exchange section and the excessive heat exchange section, and obtain the flow-temperature combination constraint zone. S4: Based on the flow-temperature combination constraint zone, determine the flow adjustment direction and water temperature adjustment direction of the insufficient heat exchange section, adjust the opening of the electric valve to change the water flow state of the section, compare the heat exchange performance of the section after adjustment, and screen the combination within the outlet set temperature range to obtain the adjustment combination set. S5: Based on the set of adjustment combinations, compare the heat exchange performance and coordination relationship of each combination section, check the corresponding situation of the outlet set temperature, select the combination with the highest matching order of the sections, adjust the flow rate setting and inlet water temperature setting of each section of the cooling water tank, and obtain the control execution command.

2. The intelligent optimization method for plastic pellet production process parameters according to claim 1, characterized in that, The time-series correspondence sequence includes a batch identifier chain, a measurement point synchronization index, and a travel priority identifier. The heat exchange propulsion sequence includes a section cooling gradient, a heat exchange level along the flow path, and a water-thermal coupling identifier. The flow-temperature combination constraint zone includes a cooling offset zone, a combination matching boundary, and an allowable adjustment range. The adjustment combination set includes a valve position configuration item, a water supply item, and an end-point temperature matching item. The control execution command includes a section valve position command, an inlet water setting command, and a linkage issuance sequence.

3. The intelligent optimization method for plastic pellet production process parameters according to claim 1, characterized in that, The steps for the time-series correspondence sequence are as follows: S101: Based on the die head discharge temperature record, analyze the corresponding time with the cooling water tank inlet and outlet water temperature record, compare the order of each measuring point acquisition, determine the time misalignment segment in the same round of acquisition, adjust the order of the die head measuring point and the cooling water tank measuring point, and obtain the measuring point time sequence index set. S102: Based on the time sequence index set of the measuring points, calculate the entry time and exit time of the traction device corresponding to the linear velocity of the traction device, compare the order of particle leaving the mold and passing through the trough, determine the order of particle movement along the trough in the same batch, and obtain the batch passing through the trough sequence. S103: Based on the batch aging sequence, compare the temperature recording intervals corresponding to the entry and exit times of particles in the same batch, adjust the time stamp arrangement order of each measuring point, determine the corresponding position of the batch identifier chain and the synchronization index, and obtain the time sequence correspondence sequence.

4. The intelligent optimization method for plastic pellet production process parameters according to claim 1, characterized in that, The specific steps of the heat exchange propulsion sequence are as follows: S201: Based on the time sequence correspondence, check the segment position mark and particle movement sequence, match the inlet temperature segment and outlet temperature segment of the same batch of particles, compare the front and back positions along the corresponding time along the conveying path, and obtain the conveying temperature change sequence. S202: Based on the conveying temperature change sequence, retrieve the start and end times of the segment and the travel interval, calculate the surface temperature drop corresponding to the particle residence time, verify the correspondence between residence time and cooling direction, associate the segment residence time with the temperature change range, and obtain the segment cooling correspondence set. S203: Based on the set of corresponding cooling relationships in the section, retrieve the cooling water inlet temperature, outlet temperature and section flow records, compare the changes in water temperature difference and flow rate in the same section, determine the correspondence between particle temperature change and water flow state, screen the heat exchange advancement order of the section, and obtain the heat exchange advancement sequence.

5. The intelligent optimization method for plastic pellet production process parameters according to claim 1, characterized in that, The specific steps for establishing the flow-temperature combination constraint band are as follows: S301: Based on the heat exchange propulsion sequence, retrieve the inlet water temperature record, outlet water temperature record and flow rate record of each section, check the correspondence between the direction of water temperature change and the flow rate status of the same section according to the section order, associate the flow rate status and water temperature status change of each section, and obtain the section flow temperature correspondence set. S302: Based on the set of corresponding flow temperatures in the sections, call the records of particle surface temperature changes in each section and the corresponding process of the outlet shaping temperature range, compare the heat exchange performance of the sections with the connection relationship of the shaping progress order, determine the location of the insufficient heat exchange section and the location of the excessive heat exchange section, and obtain the section offset data. S303: Based on the section offset data, associate the flow state and water temperature state of each section with their corresponding positions, screen the combination relationship between insufficient heat exchange sections and excessive heat exchange sections, and sort out the corresponding restriction relationship of each section to obtain the flow-temperature combination constraint zone.

6. The intelligent optimization method for plastic pellet production process parameters according to claim 1, characterized in that, The specific steps for adjusting the combination set are as follows: S401: Based on the flow-temperature combination constraint zone, check the flow state and water temperature state restrictions corresponding to the location of the insufficient heat exchange section, compare the order of inlet water temperature, outlet water temperature and flow rate coordination of each section, determine the direction of flow increase / decrease and water temperature rise / fall of each insufficient heat exchange section, and obtain the flow-temperature adjustment judgment set. S402: Based on the flow temperature adjustment determination set, call the opening position of the electric valve and the water supply passage position of each section, adjust the opening and closing sequence of the valves in the corresponding section, check the connection relationship of the water supply path of each section after the valve position change, determine the result of the change of water supply status of each section, and obtain the valve position water supply mapping table. S403: Based on the valve position water flow mapping table, compare the heat exchange performance after the water flow status changes in each section with the corresponding relationship of the outlet set temperature range, screen the matching position of the section flow state and the inlet water temperature, and sort out the corresponding combination relationship of the outlet temperature state to obtain the adjustment combination set.

7. The intelligent optimization method for plastic pellet production process parameters according to claim 1, characterized in that, The specific steps for executing the control instruction are as follows: S501: Based on the set of adjustment combinations, check the order of the flow rate status, inlet water temperature status and heat exchange performance of each combination, compare the correspondence between the temperature connection position of each section and the outlet set temperature range, and obtain the section heat connection sequence. S502: Based on the heat connection sequence of the section, associate the heat exchange connection status of adjacent sections within the same combination, calculate the correspondence between the cooling continuity of the front section and the shaping acceptance of the rear section, compare the degree of coordination of the advancement of each combination section, and obtain the combination coordination sequence. S503: Based on the combined coordination sequence, compare the degree of correspondence between the outlet shaping temperature of each combination and the position of the matching order of the sections, screen out the combination with the higher matching order, adjust the flow rate setting and inlet water temperature setting of each section of the cooling water tank, and obtain the control execution command.

8. The intelligent optimization method for plastic pellet production process parameters according to claim 1, characterized in that, The outlet water temperature record refers to the water temperature record corresponding to the location where the cooling water flows out of the cooling water tank outlet, and the particle entry time refers to the time marker corresponding to the location where the particles enter the cooling water tank inlet.

9. The intelligent optimization method for plastic pellet production process parameters according to claim 1, characterized in that, The conveying path refers to the movement path of the plastic particles from the inlet to the outlet of the cooling water tank, and the section dwell time refers to the duration of time the particles pass through a single section.

10. A smart optimization system for plastic pellet production process parameters, the system being used to implement the smart optimization method for plastic pellet production process parameters as described in any one of claims 1-9, characterized in that, The system includes: The timing construction module obtains the inlet and outlet water temperature records of the cooling water tank based on the die head discharge temperature record. It combines the linear velocity of the traction device to determine the entry and exit times of the particles into the tank and organizes the time markers of the measuring points according to the order of the particles passing through the tank in the same batch, thus obtaining the timing correspondence sequence. Based on the time-series correspondence sequence, the heat exchange propulsion module divides the transport path into segments, correlates the particle surface temperature change with the segment residence time, and combines the cooling water inlet temperature, outlet temperature difference and flow rate change to determine the heat exchange propulsion sequence of each segment. Based on the heat exchange propulsion sequence, the flow temperature constraint module associates the flow state and water temperature state changes of each section, compares the heat exchange performance of the section with the fixed propulsion sequence, determines the insufficient heat exchange section and the excessive heat exchange section, and obtains the flow temperature combined constraint zone. Based on the flow-temperature combination constraint zone, the adjustment combination module determines the flow adjustment direction and water temperature adjustment direction of the insufficient heat exchange section, adjusts the opening of the electric valve to change the water flow state of the section, compares the heat exchange performance of the section after adjustment, and selects combinations within the outlet set temperature range to obtain the adjustment combination set. Based on the aforementioned set of adjustment combinations, the control output module compares the heat exchange performance and propulsion coordination of each combination section, verifies the corresponding outlet set temperature, selects the combination with the highest matching order, adjusts the flow rate setting and inlet water temperature setting of each section of the cooling water tank, and obtains the control execution command.

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