A cable process association classification method based on a knowledge graph

Abstract

The present application relates to cable process management technical field, specifically to a kind of cable process association classification method based on knowledge graph, the process in process route is built as node, and the material retention site is built as residual node and registers residual digestion amount, connection forms process association passage;According to the base material system, crosslinking system, filler system and decomposition temperature of material of front and rear process, determine compatibility category, according to temperature regime gear conversion direction determine transition category;Determine association category according to disposal intensity, determine replacement length, transition section length and process connection order in combination with process association passage and residual digestion amount;Collect multiple replacement first section inspection results, and according to the residual node combination difference, correct residual digestion amount.The present application is suitable for the connection direction classification and replacement disposal planning of cross-specification replacement.

Description

Technical Field

[0001] This invention relates to the field of cable process management technology, specifically a cable process association and classification method based on knowledge graphs. Background Technology

[0002] Cable production typically involves continuous or discrete processes such as wire drawing, stranding, insulation, cabling, and sheathing. The same production equipment can handle the processing of different models and specifications of cables. The equipment status, process capabilities, material properties, and production direction before and after the change of type all affect the connection between adjacent processes.

[0003] Current production management methods often rely on process numbers, equipment numbers, or fixed process routes to establish connections, and depend on manual experience to determine whether preceding and following processes can be connected. When the same equipment continuously performs cross-specification production tasks, static association rules struggle to distinguish between direct connections, reverse connections, connections after type change, and non-connectivity. They also fail to clearly define corresponding mold change, parameter adjustment, line clearing, or material switching requirements, easily leading to misjudgments of process associations and impacting production planning and process transition management. Therefore, there is an urgent need for a method that can accurately classify the association categories of preceding and following cable processes by combining equipment, specifications, process direction, and type change conditions.

[0004] To address this, a knowledge graph-based method for classifying cable processes is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a knowledge graph-based method for classifying cable processes. By constructing a knowledge graph of cable processes containing residual nodes and residual amount of dissipation, the method determines material compatibility and temperature transitionability, generates associated categories, changeover lengths and process connection sequences, and corrects retention parameters based on the results of the first inspection.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A knowledge graph-based method for classifying cable manufacturing processes includes: The process in the cable manufacturing process is set as a node, the part of each process where material is retained is set as a residual node, the residual amount of each residual node is recorded, and the process-related paths are obtained by connecting the preceding and following processes with the residual nodes. Based on the base material system, crosslinking system, filler system, and decomposition temperature of the materials in the preceding and following processes, the compatibility category of each edge in the process-related pathway is determined. The transitional category of the preceding and following processes is determined by the relative height of the temperature regime settings of the preceding and following processes. Processes at the same temperature regime setting are considered direct connections, while those at a higher temperature regime setting are considered online transitions. For processes that do not have active cooling methods, those at a lower temperature regime setting are considered blocked processes. According to the preset treatment intensity sequence, the category with the higher treatment intensity between the compatibility category and the transitional category is taken as the related category of the preceding and following processes; Based on the residual amount of each residual node on the process-related path and the associated category, determine the replacement length and transition section length, and generate the process connection sequence; After changing the form according to the process sequence, collect the inspection results of the first stage of multiple form changes, and adjust the residual amount of residual nodes according to the differences in the combination of residual nodes in each form change.

[0007] Preferably, the process of obtaining the process-related pathway includes: along the flow direction of each layer of material from the inlet to the outlet in each process, using the material diversion position, material merging position, and material retention boundary as segmentation positions to form the directed flow branches corresponding to each layer of material; converting the material retention parts in the directed flow branches that are continuously passed by the materials of the previous process and the materials of the next process into residual nodes, and connecting adjacent residual nodes according to the material passing order; when multiple directed flow branches enter the branch merging section, retaining the residual nodes before merging at the corresponding material layer, and connecting the residual nodes after merging to each directed flow branch entering the branch merging section; retrieving from the previous process node along the directed flow branch to the next process node, retaining the residual nodes that the previous and next processes pass through together and the connection direction, to form the process-related pathway.

[0008] Preferably, the process of obtaining the compatibility category includes: judging each edge in the process-related pathway according to the order of structural-functional conflict, thermal decomposition conflict, crosslinking reaction conflict, and dilution compatibility; when the semiconductive material residue from the previous process enters the shared residual node corresponding to the insulating material in the subsequent process, it is judged as structurally mutually exclusive; when the temperature regime of the subsequent process reaches the decomposition temperature of the residual filler from the previous process, and the corresponding residual node is located in the material pathway covered by the temperature regime, it is judged as thermochemically mutually exclusive; when there is a crosslinking inhibition or premature crosslinking relationship between the crosslinking system of the previous process and the base material system of the subsequent process, or when the chlorine-containing material of the previous process has a corrosion or scorching relationship under the temperature regime of the subsequent process, it is judged as chemically conflicting; when the materials of the previous and subsequent processes use the same base material system and only the material grade or color is different, and the residual material falls into the corresponding inspection range after continuous extrusion, it is judged as dilutable; when none of the aforementioned conflicts are established and the composition of the materials of the previous and subsequent processes is the same, it is judged as directly compatible; after a compatibility category is established, the judgment of the category with lower intensity is stopped, and the established compatibility category is written into the corresponding edge.

[0009] Preferably, the process for obtaining the transitionability category includes: comparing temperature regime levels according to the direction from the previous process to the next process and from the next process to the previous process, respectively; when the two temperature regime levels are the same, the corresponding direction is determined to be a direct connection; when switching from a low temperature regime level to a high temperature regime level, the temperature change process is mapped to the material position after the changeover according to the order in which each temperature zone enters the temperature range of the next process, and the material segment between the first temperature zone leaving the temperature range of the previous process and the last temperature zone entering the temperature range of the next process is determined to be an online transition segment, and the corresponding direction is determined to be an online transition; when switching from a high temperature regime level to a low temperature regime level and there is no active cooling means, the moment when the last temperature zone enters the temperature range of the next process is taken as the end time of the blockage, the process connection state before the end time of the blockage is determined to be a blockage, and the material remaining in the material passage during the blockage period is included in the changeover treatment scope.

[0010] Preferably, the process of obtaining the associated category includes: converting directly compatible and direct connection types into direct connection requirements, online transition types into transition section requirements, dilutable types into fixed-length replacement requirements, stagnation types into waiting connection requirements, chemically conflicting types into connection requirements after residue removal, structurally mutually exclusive types into shutdown and disassembly requirements, and thermochemically mutually exclusive types into prohibition of connection requirements under the current temperature regime; determining the treatment intensity in the order of direct connection, setting a transition section, fixed-length replacement, waiting for connection, residue removal, shutdown and disassembly, and prohibition of connection; taking the category with the higher treatment intensity between the compatibility category and the transitional category as the associated category, and writing the treatment requirements corresponding to the other category that are not included in the associated category into the execution conditions of the associated category.

[0011] Preferably, the process of obtaining the process connection sequence includes: for every two processes to be scheduled, retrieving the associated categories and process associated paths according to the two connection directions, and deleting the connection directions that are prohibited from connection according to the associated categories; taking the changeover starting point as a unified starting point, sequentially connecting the conveying length that the material of the subsequent process passes through before reaching each residual node with the corresponding residual digestion amount, and determining the material position corresponding to each residual node when it reaches the residual inspection range; for residual nodes in the same material branch that are synchronously replaced by the material of the subsequent process, determining the replacement length based on the material position that finally reaches the residual inspection range; for parallel material branches, converting the residual digestion amount to the same material length according to the material distribution relationship of each branch. The baseline is used, and the replacement length is determined by the branch position that finally reaches the residual inspection range. For residual nodes that cannot be replaced synchronously, the corresponding replacement length is connected according to the material passage sequence. When the replacement process and online transition are executed simultaneously, the end point of the transition section is determined by the later position between the replacement end position and the online transition end position. When the replacement process and online transition are executed sequentially, the replacement section and the online transition section are connected according to the execution sequence. The replacement length, transition section length, and stagnation state formed by each connection direction are written into the corresponding process connection edge. Among the complete candidate sequences that satisfy the sequential relationship of the cable process route, the candidate sequence with the smallest sum of replacement length and transition section length is selected as the process connection sequence.

[0012] Preferably, the process for correcting the residual amount of residual nodes includes: selecting the first stage test results according to compatibility category, with dilutable types corresponding to color test results, chemically conflicting types corresponding to crosslinking state and charred product test results, structurally mutually exclusive types corresponding to conductive impurities and electrical withstand test results, and thermochemically mutually exclusive types corresponding to decomposition products and porosity test results; arranging the test results according to material position starting from the start of the replacement process, and determining the first material position that meets the continuous qualified conditions specified in the test procedure as the actual residual compliance position; in replacement records with the same material combination, temperature change direction, and material branch, Two replacement records that differ by only one residual node in the residual node combination are selected, and the difference in the actual residual compliance position is attributed to the difference in residual node. When there are multiple different residual nodes in two replacement records, the correction results corresponding to each residual node are separated step by step according to the inclusion relationship of adjacent combinations that differ by only one residual node. If the inclusion relationship does not exist, the residual dissipation amount remains unchanged. When multiple correction results obtained for the same residual node are in the same direction, the maximum value among the residual dissipation amounts corresponding to the multiple correction results is taken to form the update value, and the update value is limited to the corresponding preceding and following material combinations, temperature conversion direction, and material branch.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention transforms processes, material branching points, confluence points, and retention boundaries into directional nodes, residual nodes, and connecting edges, forming process-related pathways that reflect the actual flow sequence and shared retention relationships of materials at each layer. Then, based on the base material system, crosslinking system, filler system, decomposition temperature, and temperature regime conversion direction, compatibility and transitionability are determined edge by edge. The classification conclusions can be applied to specific connecting directions, material branches, and retention locations, avoiding conflicts and omissions caused by judging solely based on process names or formula similarity. It also retains the criteria for determining material composition, heating state, and temperature conversion, improving the accuracy, interpretability, and traceability of cross-specification change-related classifications.

[0014] 2. This invention converts compatibility and transitionability categories into unified treatment requirements, determines the associated category based on treatment intensity, and retains execution conditions not covered by higher intensity categories. Combining the residual digestion amount, conveying length, material distribution relationship, and replacement sequence of each residual node, it determines the replacement length, transition section length, and stagnation state. Then, it selects the sequence with the smallest sum of replacement length and transition section length from candidate sequences that meet process route constraints. This method ensures that shutdown cleaning, waiting for connection, fixed-length replacement, and online transition correspond to the actual material path, avoiding repeated length calculations or omissions in parallel branches, asynchronous replacement parts, and temperature zone transition processes. It reduces changeover waste and waiting time, and improves the executability of process connection sequences.

[0015] 3. This invention selects the first-stage inspection items according to compatibility categories, determines the actual residual compliance location based on continuous compliance conditions, and separates the correction results of individual residual nodes in replacement records with the same material combinations, temperature change directions, and material branches, based on differences in residual node combinations. Records that cannot be separated retain their original values, and for multiple corrections in the same direction, the maximum residual dissipation amount is taken, with the updated value limited to the corresponding operating condition. The inspection results can be back-attributed to the specific residual node causing the residual impact, preventing the mixing of correction parameters between different material systems, change directions, or branches. This ensures that the residual dissipation amount is updated based on actual replacement evidence, improving the stability of subsequent replacement length calculations and the reliability of parameter application boundaries. Attached Figure Description

[0016] Figure 1 A schematic diagram of a knowledge graph-based cable process association classification method provided by the present invention; Figure 2 A schematic diagram of the logic flow for determining the compatibility category provided by the present invention; Figure 3 This is a schematic diagram of the logic flow for correcting the residual amount of digestion provided by the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0018] Example 1: This embodiment uses a cable manufacturing unit as an example to illustrate the complete implementation process of the method described in this invention. The manufacturing unit includes a catenary cross-linking production line and a sheathing extruder. The main unit of the cross-linking production line is a three-layer co-extrusion die head, with the inner shielding layer, insulation layer, and outer shielding layer each supplied by three separate extruders. The cross-linking tube is divided into several temperature zones along the axial direction, equipped only with active heating methods, without active cooling methods. The sheathing extruder is a single-layer extrusion die head, equipped with a forced ventilation cooling section. The production processes in this manufacturing unit include: medium-pressure cross-linked polyethylene insulation process, another grade of cross-linked polyethylene insulation process, cross-linked polyethylene insulation process of the same grade but different cross-section, flame-retardant cross-linked polyethylene insulation process containing aluminum hydroxide filler, semi-conductive shielding co-extrusion process, black PVC sheathing process, white PVC sheathing process, and low-smoke halogen-free sheathing process.

[0019] Please see Figure 1 This invention provides a knowledge graph-based method for classifying cable process associations. The technical solution is as follows: Processes in the cable manufacturing process are designated as nodes; areas with material retention in each process are designated as residual nodes; residual amount is recorded for each residual node; and processes before and after are connected to residual nodes to obtain process association pathways. Compatibility is determined for each edge of the process association pathway based on the base material system, crosslinking system, filler system, and decomposition temperature of the materials in the preceding and following processes. The relationship between the temperature regime levels of the preceding and following processes is also determined. Transitional categories are categorized as follows: direct connection at the same level, online transition at higher levels, and blocking at lower levels for processes without active cooling. Based on the preset treatment intensity sequence, the category with the higher treatment intensity between the compatibility and transitional categories is selected as the associated category for the preceding and following processes. The replacement length and transition section length are determined based on the residual dissipation amount at each residual node along the associated category and process path, generating the process connection sequence. After replacement according to the process connection sequence, the inspection results of the first stage of multiple replacements are collected, and the residual dissipation amount at the residual nodes is corrected based on the differences in the residual node combinations passed through each replacement.

[0020] Furthermore, the process of obtaining the process-related pathways includes: along the flow direction of each layer of material from the inlet to the outlet in each process, using the material diversion position, material merging position, and material retention boundary as segmentation positions to form directed flow branches corresponding to each layer of material; converting the material retention parts in the directed flow branches that are continuously passed by the materials of the previous process and the materials of the subsequent process into residual nodes, and connecting adjacent residual nodes according to the material passing order; when multiple directed flow branches enter the branch merging section, retaining the residual nodes before merging at the corresponding material layer, and connecting the residual nodes after merging to each directed flow branch entering the branch merging section; retrieving from the previous process node along the directed flow branch to the subsequent process node, retaining the residual nodes and connection directions passed by the previous and subsequent processes, and forming the process-related pathways.

[0021] Specifically, along the flow direction of each layer of material from the inlet to the outlet in each process, the material diversion point, material convergence point, and material retention boundary are used as segmentation points to form directional flow branches corresponding to each layer of material. In this embodiment, the crosslinking production line forms three directional flow branches: the inner shielding layer branch, the insulation layer branch, and the outer shielding layer branch. The sheath extruder is a single-layer extruder, forming one directional flow branch.

[0022] In a directed flow branch, material retention areas where materials from the preceding and following processes continuously pass through are converted into residual nodes. During conversion, the average residence time of the material at each retention area (calculated by combining the effective material holding volume of the flow channel with the actual discharge rate) is compared with the scorch induction period of the material at that location's operating temperature (obtained according to the relevant material's rheological or crosslinking test procedures). In this embodiment, the screw metering section and die head splitter of the insulation layer branch both have residence times exceeding the scorch induction period, and are each separately established as a residual node, denoted as the insulation layer metering entity and the insulation layer splitter entity, respectively. The transition flow channel between them has a residence time not exceeding the scorch induction period and is incorporated into the adjacent downstream residual node, i.e., the insulation layer splitter entity. The branch confluence section and the die core cone surface gap both have residence times exceeding the scorch induction period, and are each separately established as a residual node, denoted as the co-extrusion confluence entity and the die gap entity, respectively. The inner shielding layer branch and the outer shielding layer branch obtain the inner shielding layer metering entity, the inner shielding layer flow distribution entity, the outer shielding layer metering entity, and the outer shielding layer flow distribution entity respectively in the same manner. The sheath extruder obtains the sheath metering entity, the sheath flow distribution entity, and the sheath die entity.

[0023] Adjacent residual nodes are connected according to the material flow sequence: within the insulation layer branch, the insulation layer metering entity is connected to the insulation layer flow distribution entity; the same applies to the inner shielding layer branch and the outer shielding layer branch. When the three directional flow branches enter the branch confluence section, the residual nodes before confluence are retained at the corresponding material layer position, that is, the insulation layer metering entity and the insulation layer flow distribution entity belong only to the insulation layer position, and the two sets of entities of the inner shielding layer and the outer shielding layer belong only to their respective layers; the residual nodes after confluence are connected to each directional flow branch entering the branch confluence section, that is, the co-extrusion confluence entity and the die gap entity belong to the three branches simultaneously, and are respectively connected to the flow distribution entities of the three branches.

[0024] The process traces the flow from the preceding process node to the subsequent process node along a directed flow branch, retaining residual nodes and connection directions shared by both processes to form a process-related path. For example, in the case of a medium-voltage cross-linked polyethylene insulation process pointing to another grade of cross-linked polyethylene insulation process, both processes use three branches, and the retrieval retains all eight residual nodes and their connection directions. Similarly, in the case of a semi-conductive shielded co-extrusion process pointing to an insulation process without a shield, the subsequent process does not use inner and outer shield branches. The retrieval only retains the insulation metering entity, insulation shunt entity, co-extrusion merging entity, and die gap entity. The co-extrusion merging entity and die gap entity are passed through by semi-conductive material in the preceding process and by insulating material in the subsequent process, forming shared residual nodes.

[0025] For each residual node, register the channel volume, current material being carried, and residual digestion amount. The initial value of the current material being carried is taken from the material actually processed in the previous batch. The initial value of the residual digestion amount is calculated based on the initial calibration replacement requirement or the effective material holding volume of the channel. The process-related pathways and the above-mentioned registered items are written into the graph.

[0026] Furthermore, referring to Figure 2 The process of obtaining compatibility categories includes: judging each edge in the process-related pathway according to the order of structural-functional conflict, thermal decomposition conflict, crosslinking reaction conflict, and dilution compatibility; when the semiconductive material residue from the previous process enters the shared residual node corresponding to the insulating material in the subsequent process, it is judged as structurally mutually exclusive; when the temperature regime of the subsequent process reaches the decomposition temperature of the residual filler from the previous process, and the corresponding residual node is located in the material pathway covered by the temperature regime, it is judged as thermochemically mutually exclusive; when there is a crosslinking inhibition or premature crosslinking relationship between the crosslinking system of the previous process and the base material system of the subsequent process, or when the chlorine-containing material of the previous process has a corrosion or scorching relationship under the temperature regime of the subsequent process, it is judged as chemically conflicting; when the materials of the previous and subsequent processes use the same base material system and only the material grade or color is different, and the residual material falls into the corresponding inspection range after continuous extrusion, it is judged as dilutable; when none of the aforementioned conflicts are established and the composition of the materials of the previous and subsequent processes is the same, it is judged as directly compatible; after a compatibility category is established, the judgment of the category with lower intensity is stopped, and the established compatibility category is written into the corresponding edge.

[0027] Specifically, each edge in the process-related pathway is evaluated sequentially according to the following order: structural-functional conflict, thermal decomposition conflict, crosslinking reaction conflict, and dilution compatibility. Once a compatibility category is established, the evaluation of lower-intensity categories is stopped, and the established category is written into the corresponding edge. The preset treatment intensities, from low to high, are: direct connection, setting a transition section, fixed-length replacement, waiting for connection, connection after removing residues, shutdown and disassembly / cleaning, and connection prohibited under the current temperature regime. When comparing the compatibility category and the transitional category, the treatment requirement with the higher treatment intensity is taken as the related category; if the treatment requirement with the lower treatment intensity applies to different treatment objects and is not covered by the related category, the treatment requirement with the lower treatment intensity is written into the execution conditions of the related category.

[0028] The determination is made when the semiconductive material residue from the previous process enters the shared residual node corresponding to the insulating material in the subsequent process. In this embodiment, when the semiconductive shielded co-extrusion process points to the insulating process without a shielding layer, the co-extrusion confluence entity and the die gap entity are the shared residual node. The carbon black contained in the semiconductive material from the previous process remains in both entities and enters the insulating layer of the subsequent process. Trace residue forms a conductive path in the insulating layer. When its concentration causes the electrical performance of the insulating layer to exceed the qualified boundary specified by the applicable product standard and material inspection procedure, concentration dilution cannot make it fall into the residual inspection range. Therefore, this determination does not compare the operating temperature, and the two sides are determined to be structurally mutually exclusive. The residual inspection range refers to the qualified boundary of the inspection results corresponding to the output material of the changeover. The dilutable type corresponds to the color inspection results, the chemically conflicting type corresponds to the crosslinking state and charred product inspection results, the structurally mutually exclusive type corresponds to the conductive impurities and electrical withstand test results, and the thermochemically mutually exclusive type corresponds to the decomposition products and porosity inspection results. The upper limit, lower limit, or qualified status of each inspection item is obtained from the applicable product standard, material inspection procedure, and first-stage inspection procedure of the changed product, and is determined before this changeover. When multiple inspection items are involved, the inspection results are considered to be within the scope of residual inspection only if all inspection items pass.

[0029] The determination is made when the temperature regime of the subsequent process reaches the decomposition temperature of the residual filler from the previous process, and the corresponding residual node is located in the material path covered by the temperature regime. The material path covered by the temperature regime refers to the flow channel section reached by the temperature zone set by the temperature regime in the material flow direction. In this embodiment, when the flame-retardant cross-linked polyethylene insulation process containing aluminum hydroxide filler points to the medium-voltage cross-linked polyethylene insulation process, the insulation layer splitting entity, the co-extrusion merging entity, and the die gap entity are all located in the material path covered by the temperature regime of the subsequent process, and the operating temperature of the subsequent process at the above-mentioned entities reaches the decomposition temperature of aluminum hydroxide. The residual filler from the previous process decomposes in the above-mentioned entities, releasing gaseous products and forming pores in the insulation layer of the subsequent process. The three sides are determined to be thermochemically repulsive.

[0030] The determination is made when there is a crosslinking inhibition or premature crosslinking relationship between the crosslinking system of the preceding process and the base material system of the following process, or when there is corrosion or scorching relationship between the chlorine-containing material of the preceding process and the temperature regime of the following process. Crosslinking inhibition or premature crosslinking relationship refers to the crosslinking initiation temperature of the preceding process material being lower than the operating temperature of the residual node under the temperature regime of the following process, causing the residue to crosslink into an inmeltable substance within the residual node. Corrosion or scorching relationship refers to the operating temperature of the residual node under the temperature regime of the following process being higher than the temperature at which the chlorine-containing material releases hydrogen chloride, causing the residue to decompose and release hydrogen chloride, corroding the flow channel wall and promoting scorching of subsequent materials. In this embodiment, when the black PVC sheath process leads to the low-smoke halogen-free sheath process, the sheath metering entity, the sheath distribution entity, and the sheath die entity are all higher than the starting temperature of PVC dehydrochlorination under the operating temperature of the following process, and the three sides are determined to be of the chemical conflict type.

[0031] When materials from the preceding and following processes use the same base material system and differ only in material grade or color, and the residual material falls within the corresponding inspection range after continuous extrusion, the process is deemed successful. In this embodiment, when the black PVC sheath process leads to the white PVC sheath process, both have the same base material system and crosslinking system, differing only in color. Furthermore, the residue remains in a molten state at a temperature below its crosslinking initiation temperature and filler decomposition temperature during the subsequent process's operating temperature. As subsequent materials are continuously extruded, the concentration gradually decreases to within the color difference limit, and the three sides are determined to be dilutable.

[0032] The condition is deemed valid when none of the aforementioned conflicts exist and the material composition of the preceding and following processes is the same. In this embodiment, when the medium-voltage cross-linked polyethylene insulation process refers to a cross-linked polyethylene insulation process of the same grade but different cross-section, the material composition is the same, the residue is the same as the subsequent material, and all eight sides are determined to be directly compatible.

[0033] Furthermore, the process for obtaining the transitional category includes: comparing temperature regime levels according to the direction from the previous process to the next process and from the next process to the previous process, respectively; when the two temperature regime levels are the same, the corresponding direction is determined to be a direct connection; when switching from a low temperature regime level to a high temperature regime level, the temperature change process is mapped to the material position after the changeover according to the order in which each temperature zone enters the temperature range of the next process, and the material segment between the first temperature zone leaving the temperature range of the previous process and the last temperature zone entering the temperature range of the next process is determined to be an online transition segment, and the corresponding direction is determined to be an online transition; when switching from a high temperature regime level to a low temperature regime level and there is no active cooling means, the moment when the last temperature zone enters the temperature range of the next process is taken as the end time of the blockage, the process connection state before the end time of the blockage is determined to be a blockage, and the material remaining in the material passage during the blockage period is included in the changeover treatment scope.

[0034] Furthermore, the temperature regime levels are compared in two directions: from the preceding process to the following process and from the following process to the preceding process. Each direction yields a transitional category.

[0035] When two temperature regime settings are the same, the corresponding directions are determined to be directly connected. In this embodiment, the medium-voltage cross-linked polyethylene insulation process and the cross-linked polyethylene insulation process of another grade use the same temperature regime setting, and both directions are determined to be directly connected.

[0036] When switching from a low-temperature regime to a high-temperature regime, the cross-linking pipe has an active heating mechanism with a controllable heating rate. The material retained in the heating section is for the subsequent process. Based on the order in which each temperature zone enters the temperature range of the subsequent process, the temperature change process is mapped to the material position after the changeover using the linear velocity at the changeover point. That is, with the changeover start point as zero, the time when each temperature zone leaves the previous process's temperature range and the time when it enters the subsequent process's temperature range are multiplied by the linear velocity to obtain the corresponding material position. The material segment between the material position corresponding to the first temperature zone leaving the previous process's temperature range and the material position corresponding to the last temperature zone entering the subsequent process's temperature range is defined as the online transition segment, and the corresponding direction is defined as the online transition. Material in the online transition segment is treated as downgraded material.

[0037] When switching from a high-temperature regime to a low-temperature regime without active cooling, the heating section retains materials from the previous process. Cooling relies solely on natural heat dissipation. The cross-linking pipe and insulation layer have high heat capacity and similar axial heat dissipation conditions. The measured temperatures of each temperature zone are monitored, and the moment the last temperature zone to enter the temperature range of the subsequent process is taken as the end of the blockage. The process connection state before the end of the blockage is considered a blockage, and the material remaining in the material path during the blockage period is included in the replacement treatment scope. During this period, the material from the previous process remains above the cross-linking temperature, and the degree of cross-linking exceeds the product standard specification range, thus it cannot be released as a qualified product. In this embodiment, the direction from the high-voltage insulation process to the low-voltage insulation process in the cross-linking production line is considered a blockage, and the opposite direction is considered an online transition.

[0038] The sheath extruder is equipped with a forced ventilation cooling section. When switching from a high temperature setting to a low temperature setting, the time when each temperature zone enters the temperature range of the subsequent process under forced ventilation is used to re-determine the temperature range instead of the time under natural heat dissipation. The PVC sheath material is a thermoplastic system and does not contain cross-linking. No cross-linking occurs during the cooling period, and this direction is determined as an online transition.

[0039] Furthermore, the process of obtaining the associated categories includes: converting directly compatible and direct connection types into direct connection requirements, online transition types into transition section requirements, dilutable types into fixed-length replacement requirements, blocked types into waiting connection requirements, chemically conflicting types into connection requirements after residue removal, structurally mutually exclusive types into shutdown and disassembly requirements, and thermochemically mutually exclusive types into prohibition of connection requirements under the current temperature regime; determining the treatment intensity in the order of direct connection, setting a transition section, fixed-length replacement, waiting for connection, residue removal, shutdown and disassembly, and prohibition of connection; taking the category with the higher treatment intensity between the compatibility category and the transitional category as the associated category, and writing the treatment requirements of the other category that are not included in the associated category into the execution conditions of the associated category.

[0040] Specifically, direct compatibility and direct connection will be converted into direct connection requirements, online transition will be converted into transition section requirements, dilutable type will be converted into fixed-length replacement requirements, stagnation will be converted into waiting connection requirements, chemical conflict type will be converted into connection requirements after residue removal, structurally mutually exclusive type will be converted into shutdown disassembly and cleaning requirements, and thermochemically mutually exclusive type will be converted into connection prohibition requirements under the current temperature regime.

[0041] The difference between the requirements for reconnection after residue removal and the requirements for shutdown and disassembly lies in the scope of disassembly: Chemically conflicting residues are concentrated at the location corresponding to a single residue node where the condition is deemed valid. Removing residues before connection means that after shutdown, only that location needs to be disassembled and mechanically cleaned; after cleaning, connection can proceed. Structurally incompatible residues are distributed in the co-extrusion joint and die gap, and even trace amounts are harmful. Shutdown and disassembly means that all the aforementioned locations need to be disassembled and cleaned piece by piece before connection can proceed. When thermochemical incompatibility is established, direct connection is prohibited if the residue from the previous process has not been removed from the relevant residue node and the temperature regime of the subsequent process is sufficient to decompose the residue. After changing the temperature regime, rescheduling to another process node, or completing cleaning that can remove the residue, the compatibility category determination must be re-executed.

[0042] The treatment intensity is determined in the following order: direct connection, setting a transition section, fixed-length replacement, waiting for connection, removing residues, stopping disassembly and cleaning, and prohibiting connection. The category with the higher treatment intensity between the compatibility category and the transitional category is taken as the associated category.

[0043] The category with higher handling intensity among the compatibility category and the transitional category is selected as the associated category; the handling requirements corresponding to another category that are not covered by the associated category and have actual handling content are written into the execution conditions of the associated category.

[0044] In this embodiment, the black PVC sheath process points to the white PVC sheath process: the compatibility category is dilution-type, converted to fixed-length replacement; the transitional category is direct connection, converted to direct connection; fixed-length replacement is taken as the associated category. The direct connection has a different treatment object but no actual treatment content, so it is not written into the execution conditions. The high-voltage insulation process points to the low-voltage insulation process: the compatibility category is dilution-type, converted to fixed-length replacement; the transitional category is blocking, converted to waiting connection. The waiting connection treatment intensity is higher, so waiting connection is taken as the associated category, and fixed-length replacement is written into the execution conditions; at the same time, this direction is marked as unidirectionally connectable, only retaining the connection direction where the low-voltage insulation process comes first. The semi-conductive shielded co-extrusion process points to the insulation process without a shielding layer: the compatibility category is structurally mutually exclusive, converted to shutdown disassembly and cleaning; the treatment intensity is higher than the treatment corresponding to the transitional category, so shutdown disassembly and cleaning is taken as the associated category, and the disassembly and cleaning range is the part corresponding to the co-extrusion merging entity and the die gap entity.

[0045] Furthermore, the process of obtaining the process connection sequence includes: for each pair of processes to be scheduled, retrieving the associated categories and process associated paths according to the two connection directions, and deleting the connection directions that are prohibited from connection according to the associated categories; taking the changeover starting point as a unified starting point, sequentially connecting the conveying length that the material of the subsequent process passes through before reaching each residual node with the corresponding residual digestion amount, and determining the material position corresponding to each residual node when it reaches the residual inspection range; for residual nodes in the same material branch that are synchronously replaced by the material of the subsequent process, determining the replacement length based on the material position that finally reaches the residual inspection range; for parallel material branches, converting the residual digestion amount to the same material length according to the material distribution relationship of each branch. The baseline is used, and the replacement length is determined by the branch position that finally reaches the residual inspection range. For residual nodes that cannot be replaced synchronously, the corresponding replacement length is connected according to the material passage sequence. When the replacement process and online transition are executed simultaneously, the end point of the transition section is determined by the later position between the replacement end position and the online transition end position. When the replacement process and online transition are executed sequentially, the replacement section and the online transition section are connected according to the execution sequence. The replacement length, transition section length, and stagnation state formed by each connection direction are written into the corresponding process connection edge. Among the complete candidate sequences that satisfy the sequential relationship of the cable process route, the candidate sequence with the smallest sum of replacement length and transition section length is selected as the process connection sequence.

[0046] Specifically, for every two pending processes, the associated categories and process-related paths are retrieved according to the two connection directions. Connection directions with prohibited association categories are deleted, and the corresponding forward connection directions are deleted according to the unidirectional connection marks. In this embodiment, the direction from the flame-retardant cross-linked polyethylene insulation process to the medium-voltage cross-linked polyethylene insulation process is deleted due to thermochemical repulsion; the direction from the high-voltage insulation process to the low-voltage insulation process is deleted due to the unidirectional connection marks.

[0047] Using the changeover starting point as a unified starting point, the conveying length traversed by the material in the subsequent process before reaching each residual node is sequentially connected with the corresponding residual digestion amount to determine the material position corresponding to each residual node when it reaches the residual inspection range. Before connection, the residual digestion amount is converted into material length based on the cross-sectional area of ​​the extrusion layer of the corresponding layer in the subsequent process, ensuring that both are length quantities before connection. Before conversion, the current material carried by the residual node is compared with the material in the subsequent process: for residual nodes where the two are the same, the residue has already been discharged during the previous changeover and is not included in the conversion; for residual nodes where the two are different, they are included in the conversion.

[0048] The conveying length is based on the cable length corresponding to the material consumed before the material from the subsequent process reaches the residual node, not the geometric length of the flow channel. When the flow channel data is recorded by volume, the conveying length is converted to the cross-sectional area of ​​the corresponding extrusion layer in the subsequent process; the residual digestion amount is converted to the replacement length according to the cross-sectional area of ​​the same extrusion layer, so that the conveying length and replacement length are unified in meters. When the residual digestion amount is recorded by mass, it is first converted to volume according to the material density, and then converted to the replacement length. When multiple material branches run in parallel, each branch is converted according to the cross-sectional area of ​​its corresponding extrusion layer; the shared residual node after merging is converted according to the sum of the cross-sectional areas of the extrusion layers of each branch; the position where the last residual inspection range is reached in each branch is taken as the replacement endpoint. When the residual node is replaced synchronously, the position where the replacement is completed latest is taken; when synchronous replacement is not possible, the replacement lengths of each segment are connected according to the material passage sequence.

[0049] For residual nodes in the same material branch that are synchronously replaced by materials from subsequent processes, the replacement length is determined by the position of the material that last reaches the residual inspection range. Synchronous replacement means that materials from subsequent processes continuously flow through each residual node during the same start-up operation, with the replacement of each entity occurring simultaneously. In this embodiment, the sheath metering entity, sheath diversion entity, and sheath die opening entity are located in the same branch and are synchronously replaced; the replacement length is taken as the position of the material that last reaches the residual inspection range among the three.

[0050] For parallel material branches, the residual amount of material consumed is converted to the same material length benchmark according to the material distribution relationship of each branch, and the replacement length is determined by the branch position that last reaches the residual inspection range. The material distribution relationship refers to the ratio of the cross-sectional areas of the extruded layers corresponding to each branch; on the same cable core length, the amount of material consumed by each layer is proportional to the cross-sectional area of ​​the extruded layer of that layer, so the residual amount of material consumed by each branch can be uniformly converted into the cable core length according to the ratio of the cross-sectional areas. In this embodiment, the inner shielding layer, insulation layer and outer shielding layer are three parallel branches. After conversion according to the ratio of the cross-sectional areas of the three extruded layers, the replacement length is taken as the branch position that last reaches the residual inspection range among the three branches.

[0051] For residual nodes that cannot be replaced synchronously, the corresponding replacement lengths are connected according to the material flow sequence. "Cannot be replaced synchronously" means that the part corresponding to the residual node requires mold replacement or disassembly and cleaning while the machine is stopped before material can flow through it; its replacement cannot be performed simultaneously with other entities. In this embodiment, the co-extrusion merging entity and the die gap entity after shutdown and cleaning are not fed through before reassembly. Their corresponding replacement lengths are connected to the replacement lengths of the upstream metering entities and diversion entities according to the material flow sequence, without taking the last position.

[0052] When the replacement process and online transition are executed simultaneously, the endpoint of the transition section is determined by the later of the replacement and online transition endpoints. When the replacement process and online transition are executed sequentially, the replacement section and the online transition section are connected according to the execution order. The criteria for determining whether the two can be executed simultaneously are: if the replacement temperature required for the residue to reach the residual inspection range is not higher than the temperature of the heating section during the online transition, both are executed simultaneously; if the replacement temperature is higher than the temperature of the heating section during the online transition, the replacement must be carried out after the temperature rises to the replacement temperature, and both are executed sequentially. The replacement temperature refers to the lowest actual temperature required, under the conditions of determined material combinations, material branches, and operating parameters, for the residue in the residual node to be carried out by the subsequent process material and for the changeover output material to enter the residual inspection range. The replacement temperature is obtained through graded changeover calibration within the common allowable processing temperature range of the preceding and following materials, and is the lowest temperature at which the inspection results are continuously qualified and the extrusion pressure and screw torque do not exceed the allowable range. During the online transition, if the measured temperature of each residual node to be replaced is not lower than the corresponding replacement temperature, the replacement process is executed simultaneously with the online transition; if the measured temperature of a residual node is lower than the replacement temperature, the replacement is executed after the measured temperature reaches the replacement temperature.

[0053] Furthermore, referring to Figure 3The process of correcting the residual amount of residual nodes includes: selecting the first stage test results according to compatibility category; for dilutable types, the corresponding color test results; for chemically conflicting types, the corresponding cross-linking state and charred product test results; for structurally mutually exclusive types, the corresponding conductive impurities and electrical withstand test results; and for thermochemically mutually exclusive types, the corresponding decomposition products and porosity test results. Starting from the changeover point, the test results are arranged according to material position, and the first material position that meets the continuous qualification conditions specified in the test procedure is determined as the actual residual compliance position. In changeover records with the same material combination, temperature change direction, and material branch, select... For two replacement records where the residual node combination differs by only one residual node, the difference in the actual residual compliance position is attributed to the differing residual node. When there are multiple different residual nodes in two replacement records, the correction results corresponding to each residual node are separated step by step according to the inclusion relationship between adjacent combinations that differ by only one residual node. If the inclusion relationship does not exist, the residual dissipation amount remains unchanged. When multiple correction results obtained for the same residual node have the same direction, the maximum value among the residual dissipation amounts corresponding to the multiple correction results is taken to form the update value, and the update value is limited to the corresponding preceding and following material combinations, temperature conversion direction, and material branch.

[0054] Specifically, select the first stage test results according to the compatibility category: dilutable type corresponds to color test results, chemically conflicting type corresponds to cross-linking state and charred product test results, structurally mutually exclusive type corresponds to conductive impurities and electrical withstand test results, and thermochemically mutually exclusive type corresponds to decomposition products and pore test results.

[0055] Starting from the point of material change, the inspection results are arranged according to material location. The first material location that meets the continuous qualification conditions specified in the inspection procedure is determined as the actual residual compliance location. The continuous qualification conditions are determined in the aforementioned manner, meaning that the inspection results of several consecutive sampling points starting from this material location all fall within the residual inspection range.

[0056] In the changeover records where the preceding and following material combinations, temperature transition directions, and material branches are the same, two changeover records with a residual node combination differing by only one residual node are selected. The difference in the actual residual compliance position is attributed to the difference in the residual node. Simultaneously, it is required that the currently loaded material of the shared residual node in both records is the same. Because the residual concentration of series residual nodes is diluted step by step, when the shared part is in the same state, its contribution cancels out in the subtraction, and the difference can then be attributed to the difference in the residual node. In this embodiment, one changeover record passes through the sheath metering entity, the sheath diversion entity, and the sheath die entrance entity, while the other does not pass through the sheath die entrance entity due to mold replacement. The preceding and following material combinations, temperature transition directions, and material branches of the two records are the same, and the shared entity carries the same material. The difference in the actual residual compliance position between the two is attributed to the sheath die entrance entity.

[0057] When two transformation records have multiple different residual nodes, the correction results corresponding to each residual node are separated level by level according to the inclusion relationship where adjacent combinations differ by only one residual node. That is, the residual node combinations of each transformation record are arranged according to the number of entities they contain. If two adjacent combinations differ by exactly one entity and all entities contained in the former are included in the latter, then the difference in the actual residual attainment position between the two is attributed to the differing entity. This separation is performed level by level upwards until each entity obtains its corresponding correction result. If this inclusion relationship does not exist, the residual resolution remains unchanged.

[0058] When multiple correction results obtained from the same residual node have the same direction, the maximum value among the corresponding residual digestion amounts is taken as the updated value. "Same direction" means that multiple correction results all point to increasing the residual digestion amount or all point to decreasing the residual digestion amount; if the directions are inconsistent, the original value remains unchanged. Taking the maximum value instead of the average ensures that the replacement length covers the worst-case scenario, preventing insufficient replacement from causing defects in the first stage of the replacement process to flow into the next process.

[0059] The updated value is limited to the corresponding preceding and following material combinations, temperature change directions, and material branches, and is not extrapolated to other preceding and following material combinations, other temperature change directions, or other material branches. The updated value is written back to the residual amount of the residual node in the established process-related pathway for subsequent determination of the replacement length and disassembly / washing range.

[0060] Example 2: This embodiment is implemented on the cable manufacturing unit described in Embodiment 1, and illustrates the three processes of compatibility category re-judgment after shutdown, designation of transition materials, and recycling and reuse of transition materials.

[0061] Along the flow direction of materials from inlet to outlet at each layer, directional flow branches are formed using material diversion points, material confluence points, and material retention boundaries as segmentation points. Retention areas where materials from preceding and following processes continuously pass through are converted into residual nodes. These nodes are connected according to the material flow sequence, retaining the portions shared by preceding and following processes, thus obtaining process-related pathways. Compatibility categories are determined for each side of the pathway in the order of structural-functional conflict, thermal decomposition conflict, cross-linking reaction conflict, and dilution compatibility. Temperature regime levels are compared in both directions to obtain transitional categories of direct connection, online transition, or stagnation. These two categories are converted into treatment requirements, with the higher treatment intensity selected as the related category. The other treatment requirement, with a different treatment object, is written into the execution conditions. Using the changeover starting point as a unified starting point, the conveying length and the residual digestion amount converted to material length are sequentially connected to obtain the replacement length and transition section length. The candidate sequence with the smallest sum of these two is selected as the process connection sequence. After the changeover, select the inspection items according to the compatibility category, take the first material position that meets the continuous qualification condition as the actual residual compliance position, subtract the two changeover records that differ by only one residual node from the residual node combination, correct the residual dissipation amount, and write it back to the process-related pathway.

[0062] Furthermore, the compatibility category reassessment process before the changeover operation begins is as follows: The shutdown duration of the previous shutdown, along with the measured barrel and die head temperatures at each residual node location during the shutdown, are used to obtain the accumulated thermal history of the residue during the shutdown. When the accumulated thermal history causes the gel content of the residue to reach the non-melting threshold, the compatibility category of the corresponding side is changed from dilutable to chemically conflicting. When the accumulated thermal history causes the change in the melt flow rate of the residue relative to the virgin material to reach the degradation threshold, the compatibility category of the corresponding side is changed from directly compatible to dilutable. The non-melting threshold is determined by the gel content measured by solvent extraction, and the degradation threshold is determined by the melt flow rate measurement. Both thresholds are obtained from the material inspection procedures. If no measured temperature records are available during the shutdown, the compatibility category before shutdown remains unchanged, and disassembly and cleaning are performed according to the restart procedures after shutdown. The reassessment result is written to the corresponding side and overwrites the compatibility category before shutdown. The scope of application of the reassessment result is limited to this changeover operation.

[0063] Specifically, the black PVC sheathing process and the white PVC sheathing process in this unit are determined to be dilutable under continuous production conditions, while the medium-voltage cross-linked polyethylene insulation process and the insulation process of the same grade but different cross-sections are determined to be directly compatible. The above determinations are based on the premise that the residue in the flow channel remains in a molten state. In the event of a shutdown, the residue continues to be heated at residual temperature, and the molten state may no longer hold. Therefore, a re-determination is performed before the changeover operation begins.

[0064] The temperature records of each zone of the barrel and each zone of the head are retrieved from the temperature recorders during the shutdown period. The measured temperature and duration of each time period are accumulated segment by segment to obtain the thermal history of the residue accumulated in each residual node during the shutdown period. During the heat preservation shutdown, the heating belt maintains the set value, and the measured temperature of each time period is close; during the power-off shutdown, the barrel relies on natural heat dissipation, and the measured temperature of each time period decreases sequentially. Both cases are processed using the same segment-by-segment accumulation method, and are not calculated based on the shutdown duration and a single temperature value. If there are no temperature records during the shutdown period, no re-evaluation is made, and disassembly and cleaning are performed according to the shutdown restart procedure.

[0065] When the cumulative thermal process causes the gel content of the residue to reach the non-meltable threshold, the residue has cross-linked into a substance that cannot be discharged with subsequent melt flow. The compatibility category of this side is then changed from dilutable to chemically conflicting, and the corresponding treatment changes from fixed-length replacement to residue removal followed by reconnection. When the cumulative thermal process causes the change in the melt flow rate of the residue relative to the virgin material to reach the degradation threshold, the residue, although still meltable, has deviated from its intended properties. The compatibility category of this side is then changed from directly compatible to dilutable, and the corresponding treatment changes from direct connection to fixed-length replacement.

[0066] Obtaining the non-meltable determination value: The gel content of the residue is determined by solvent extraction. The determination value is obtained from the company's material inspection procedures, taking the upper limit of the allowable gel content of the base material system during extrusion processing. Obtaining the degradation determination value: The degradation determination value is determined by a melt flow rate meter according to the test conditions specified in the material technical data sheet. The determination value is obtained from the company's material inspection procedures, taking the upper limit of the allowable change in melt flow rate of the base material system during extrusion processing. Both determination values ​​are obtained separately for each base material system.

[0067] The revised judgment result is written to the corresponding edge and overwrites the compatibility category before the shutdown. The scope of application is limited to this type change. After this type change is completed, the carrying material of each residual node has been updated, and the next type change will be re-judged according to the continuous production status. In this embodiment, after the sheath extruder is restarted after a cross-shift power outage, the residual black PVC material in the sheath metering entity reaches the non-meltable judgment value due to the cumulative thermal history obtained by segment accumulation. The edge is changed from dilutable type to chemical conflict type, and the treatment is changed from fixed-length replacement to disassembling the corresponding part of the sheath metering entity and performing mechanical cleaning.

[0068] Furthermore, the process for specifying transition materials is as follows: When the associated category includes a fixed-length replacement requirement or a transition section requirement, provided that the extrusion pressure and screw torque do not exceed the equipment's allowable range, a material with the same base material system as the subsequent process material and a melt flow rate lower than that of the preceding process material is selected as the transition material; when the associated category is a direct connection requirement and the execution conditions include a transition section requirement, the subsequent process material is selected as the transition material; when the associated category includes a connection requirement after removing residues or a shutdown and disassembly requirement, no transition material is specified for replacement. During the reassembly and start-up stage after disassembly and cleaning, a material whose processing temperature range covers the temperature regime of the subsequent process and does not contain fillers is selected as the transition material to remove debris left over from disassembly and cleaning; the specified transition material is written into the corresponding process connection edge; when the melt flow rate of the transition material is lower than that of the preceding process material, the residual amount of the corresponding residual node is reduced, and the reduced value is determined according to the actual residual compliance position obtained by using the same transition material in the existing replacement record.

[0069] Specifically, when the associated category includes fixed-length replacement requirements or transition section requirements, a transition material must be specified. The first requirement is that the base material system is the same as the material in the subsequent process, so that no new compatibility conflicts are formed between the transition section and the material in the subsequent process. The second requirement is that the melt flow rate is lower than that of the material in the preceding process. When the base material compatibility, test temperature, and load conditions are consistent, a lower melt flow rate can be used as one of the indicators for screening candidate transition materials with higher melt viscosity. The removal capacity of the transition material in the actual flow channel is also related to the shear rate, shear thinning behavior, temperature, flow rate, pressure, screw structure, and residue state. Candidate materials must be confirmed by the actual residue compliance position under the same residual operating conditions within the allowable pressure and screw torque range of the equipment; the removal capacity cannot be directly determined solely by the MFR (Melt-Free Rate).

[0070] The melt flow rate is selected with the allowable extrusion pressure and allowable screw torque specified on the equipment nameplate as the upper limit. During commissioning, the melt flow rate of the transition material is gradually reduced from high to low. At the same screw speed, the extrusion pressure and screw torque are read, and the range where neither exceeds the upper limit is selected. If all ranges exceed the upper limit, the material with the same melt flow rate as the material in the subsequent process is selected as the transition material. This limitation is to avoid extrusion pressure protection shutdown and screw overload caused by increased viscosity.

[0071] When the associated category is a direct connection requirement and the execution conditions include a transition section requirement, the residue has the same composition as the material of the subsequent process, and there is no need to select a different base material. The material of the subsequent process can be used as the transition material.

[0072] When the associated category includes requirements for post-residue removal or shutdown for disassembly and cleaning, no replacement material is specified. When this associated category is established, the residue has already cross-linked into a non-meltable substance or has decomposed to release hydrogen chloride and adhere to the flow channel walls. It is not sheared out with subsequent melt flow, and replacing it with a transition material will not remove it; further, the increased viscosity will exacerbate retention within the solidified flow channel. In such cases, the transition material is only used during the reassembly and start-up phase after disassembly and cleaning. It should be a material whose processing temperature range covers the temperature regime of the subsequent process and does not contain fillers. Its purpose is to remove debris left over from disassembly and cleaning, and it should not contain fillers to prevent decomposition and gasification at the operating temperature of the subsequent process.

[0073] The specified transition material is written to the corresponding process connection edge. When the melt flow rate of the transition material is lower than that of the material in the previous process, the residual amount of the corresponding residual node is reduced. The reduced value is determined according to the actual residual compliance position obtained by using the same transition material in the existing changeover record. If there is no changeover record for the transition material, the original value is maintained, and the updated value is obtained according to the correction process described in Example 1 after the first use.

[0074] Furthermore, the process of recycling and reusing transition materials involves: recycling and granulating the material segments formed by the input transition materials; registering the base material system, the material composition of the previous process residues, and the number of recycling cycles for the recycled material; the recycled material is only used for transformations where the material composition of the base material system and the previous process residues are dilutable with the materials of the previous and subsequent processes in this transformation, and is not used for transformations that are chemically conflicting, thermochemically mutually exclusive, or structurally mutually exclusive; after each recycling, the melt flow rate of the recycled material is measured, and when the change relative to the new material reaches the degradation judgment value, the number of recycling cycles is recorded as reaching the upper limit, and the recycled material is no longer used as transition material; when the recycled material is used as transition material, the melt flow rate corresponding to the number of recycling cycles replaces the melt flow rate of the new material, and participates in the reduction of the specified residual amount.

[0075] Specifically, the material segment formed by the input transition material is intercepted from the finished product line and recycled and granulated. The base material system, material composition of the contained previous process residues, and number of recycling times are recorded for the recycled material. The material composition of the contained previous process residues is taken from the material grade of the previous process of the residual node that was replaced in this model change.

[0076] The use of recycled materials is limited by their composition: they are only used for replacements where the composition of the base material system and the materials containing residues from previous processes are dilutable with the materials from the preceding and following processes. Recycled materials are not used for replacements that involve chemically conflicting, thermochemically incompatible, or structurally incompatible relationships. This limitation is based on the fact that recycled materials themselves contain residues from previous processes. If used for replacements that are incompatible with these residues, the recycled materials become a new source of pollution, and the replacement process introduces residues that were not originally present.

[0077] After each recycling, the melt flow rate of the recycled material was measured using a melt flow rate meter under the test conditions specified in the material technical data sheet. During repeated polymer melting and processing, chain breakage, branching, cross-linking, or multiple reactions may occur simultaneously. The direction and magnitude of melt flow rate changes may differ under different base material systems, additive systems, and processing conditions. Therefore, this embodiment does not use a fixed number of recycling cycles or a preset unidirectional change as a stopping condition. Instead, the melt flow rate of the recycled material is measured sequentially under specified temperature and load conditions. When the change relative to the virgin material reaches the degradation judgment value specified in the corresponding material inspection procedure, the batch of recycled material is discontinued as transition material and disposed of as waste.

[0078] When recycled material is used as transition material, its measured melt flow rate corresponding to the current number of recycling cycles replaces the melt flow rate of the new material. It participates in the comparison of melt flow rates with the previous process material during the aforementioned transition material designation process, as well as the reduction of residual degradation. In this embodiment, the transition material formed when switching from the black PVC sheath process to the white PVC sheath process has a base material system of PVC and contains black PVC material as residue from the previous process. After recycling, it is used for type conversion between PVC sheath processes. After several recycling cycles, the change in melt flow rate of this batch of recycled material reaches the degradation judgment value, which is recorded as reaching the upper limit, and it is no longer used as transition material.

[0079] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A knowledge graph-based method for classifying cable manufacturing processes, characterized in that, include: The process route is constructed as nodes, and the parts of each process where material is retained are constructed as residual nodes. The residual amount of each residual node is recorded, and the process-related pathways are obtained by connecting the preceding and following processes with the residual nodes. Based on the base material system, crosslinking system, filler system, and decomposition temperature of the materials in the preceding and following processes, the compatibility category of each edge in the process-related pathway is determined. The transitional category of the preceding and following processes is determined by the relative height of the temperature regime settings of the preceding and following processes. Processes at the same temperature regime setting are considered direct connections, while those at a higher temperature regime setting are considered online transitions. For processes that do not have active cooling methods, those at a lower temperature regime setting are considered blocked processes. According to the preset treatment intensity sequence, the category with the higher treatment intensity between the compatibility category and the transitional category is taken as the related category of the preceding and following processes; Based on the residual amount of each residual node on the process-related path and the associated category, determine the replacement length and transition section length, and generate the process connection sequence; After changing the form according to the process sequence, collect the inspection results of the first stage of multiple form changes, and adjust the residual amount of residual nodes according to the differences in the combination of residual nodes in each form change.

2. The cable process association classification method based on knowledge graph according to claim 1, characterized in that: The process of obtaining process-related pathways includes: along the flow direction of each layer of material from the inlet to the outlet in each process, using the material diversion position, material merging position, and material retention boundary as segmentation positions to form directed flow branches corresponding to each layer of material; converting the material retention parts in the directed flow branches that are continuously passed by materials from the previous process and materials from the next process into residual nodes, and connecting adjacent residual nodes according to the material passing order; when multiple directed flow branches enter the branch merging section, retaining the residual nodes before merging at the corresponding material layer, and connecting the residual nodes after merging to each directed flow branch entering the branch merging section; retrieving from the previous process node along the directed flow branch to the next process node, retaining the residual nodes passed by both the previous and next processes and the connection direction, forming process-related pathways.

3. The cable process association classification method based on knowledge graph according to claim 2, characterized in that: The process of obtaining compatibility categories includes: judging each edge in the process-related pathway according to the order of structural-functional conflict, thermal decomposition conflict, crosslinking reaction conflict, and dilution compatibility; when the semiconductive material residue from the previous process enters the shared residual node corresponding to the insulating material in the subsequent process, it is judged as structurally mutually exclusive; when the temperature regime of the subsequent process reaches the decomposition temperature of the residual filler from the previous process, and the corresponding residual node is located in the material pathway covered by the temperature regime, it is judged as thermochemically mutually exclusive; when there is a crosslinking inhibition or premature crosslinking relationship between the crosslinking system of the previous process and the base material system of the subsequent process, or when the chlorine-containing material of the previous process has a corrosion or scorching relationship under the temperature regime of the subsequent process, it is judged as chemically conflicting; when the materials of the previous and subsequent processes use the same base material system and only the material grade or color is different, and the residual material falls into the corresponding inspection range after continuous extrusion, it is judged as dilutable; when none of the aforementioned conflicts are established and the composition of the materials of the previous and subsequent processes is the same, it is judged as directly compatible; after a compatibility category is established, the judgment of the category with lower intensity is stopped, and the established compatibility category is written into the corresponding edge.

4. The cable process association classification method based on knowledge graph according to claim 3, characterized in that: The process for obtaining the transitionability category includes: comparing temperature regime levels according to the direction from the previous process to the next process and from the next process to the previous process respectively; when the two temperature regime levels are the same, the corresponding direction is determined to be a direct connection; when switching from a low temperature regime level to a high temperature regime level, the temperature change process is mapped to the material position after the changeover according to the order in which each temperature zone enters the temperature range of the next process, and the material segment between the first temperature zone leaving the temperature range of the previous process and the last temperature zone entering the temperature range of the next process is determined to be an online transition segment, and the corresponding direction is determined to be an online transition; when switching from a high temperature regime level to a low temperature regime level and there is no active cooling means, the moment when the last temperature zone enters the temperature range of the next process is taken as the end time of the blockage, the process connection state before the end time of the blockage is determined to be a blockage, and the material remaining in the material passage during the blockage period is included in the changeover treatment scope.

5. The cable process association classification method based on knowledge graph according to claim 4, characterized in that: The process of obtaining the associated categories includes: converting directly compatible and direct connection types into direct connection requirements, online transition types into transition section requirements, dilutable types into fixed-length replacement requirements, blocked types into waiting connection requirements, chemically conflicting types into connection requirements after residue removal, structurally mutually exclusive types into shutdown and disassembly requirements, and thermochemically mutually exclusive types into prohibition of connection requirements under the current temperature regime; determining the treatment intensity in the order of direct connection, setting a transition section, fixed-length replacement, waiting for connection, residue removal, shutdown and disassembly, and prohibition of connection; taking the category with the higher treatment intensity between the compatibility category and the transitional category as the associated category, and writing the treatment requirements of the other category that are not included in the associated category into the execution conditions of the associated category.

6. The cable process association classification method based on knowledge graph according to claim 5, characterized in that: The process of obtaining the process connection sequence includes: for each pair of processes to be scheduled, retrieve the associated categories and process associated paths according to the two connection directions, and delete the connection directions that are prohibited from connection according to the associated categories; taking the changeover starting point as a unified starting point, connect the conveying length that the material of the subsequent process passes through before reaching each residual node with the corresponding residual digestion amount in sequence to determine the material position corresponding to each residual node when it reaches the residual inspection range; for residual nodes in the same material branch that are synchronously replaced by the material of the subsequent process, determine the replacement length based on the material position that finally reaches the residual inspection range; for parallel material branches, convert the residual digestion amount to the same material length benchmark according to the material distribution relationship of each branch. The replacement length is determined by the branch position that last reaches the residual inspection range; for residual nodes that cannot be replaced synchronously, the corresponding replacement length is connected according to the material passage sequence; when the replacement process and online transition are executed simultaneously, the end point of the transition section is determined by the later position between the replacement end position and the online transition end position; when the replacement process and online transition are executed sequentially, the replacement section and the online transition section are connected according to the execution sequence; the replacement length, transition section length and stagnation state formed by each connection direction are written into the corresponding process connection edge; in the complete candidate sequence that satisfies the sequential relationship of the cable process route, the candidate sequence with the smallest sum of replacement length and transition section length is selected as the process connection sequence.

7. The cable process association classification method based on knowledge graph according to claim 1, characterized in that: The process of correcting the residual amount of residual nodes includes: selecting the first stage inspection results according to compatibility category, color inspection results for dilutable types, cross-linking state and charred product inspection results for chemically conflicting types, conductive impurities and electrical withstand tests for structurally mutually exclusive types, and decomposition products and porosity inspection results for thermochemically mutually exclusive types; arranging the inspection results according to material position starting from the start of the replacement process, and determining the first material position that meets the continuous qualified conditions specified in the inspection procedure as the actual residual compliance position; in replacement records with the same material combination, temperature change direction, and material branch, selecting two replacement records with residual node combinations differing by only one residual node, and assigning the difference in actual residual compliance positions to the differing residual nodes; when two replacement records have multiple different residual nodes, separating the correction results corresponding to each residual node step by step according to the inclusion relationship of adjacent combinations differing by only one residual node, keeping the residual amount unchanged when the inclusion relationship does not exist; when the correction results obtained for the same residual node have the same direction, taking the maximum value among the residual amounts corresponding to multiple correction results to form an update value, and limiting the update value to the corresponding material combination, temperature change direction, and material branch.

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