PVC cable material particle preparation method and equipment thereof

Abstract

The invention relates to a preparation method and equipment for PVC cable material particles, and the preparation method comprises the following steps: S1, material preparation: accurately weighing various components, adding high-purity PVC resin into a high-speed stirrer, and then sequentially adding dioctyl phthalate, a calcium-zinc composite stabilizer, an ultraviolet light absorber, calcium carbonate, stearic acid and aluminum hydroxide; s2, high-speed stirring: starting a high-speed stirrer, and stirring for 10-15 minutes at the temperature of 100-120 DEG C; s3, cooling and stirring: transferring the materials subjected to high-speed stirring into a cooling stirrer for cooling and stirring, so that the temperature of the materials is reduced to 40 DEG C or below; s4, extruding: conveying the cooled material into a double-screw extruder, melting, plasticizing and homogenizing the material in the extruder, and extruding the material into a strip-shaped material through a die head; and S5, granulation: cutting the strip-shaped materials into granules by a granulator. The performance of the PVC cable material particles can be comprehensively improved.

Description

Technical Field

[0001] The present application relates to the field of PVC preparation, and in particular to a method and equipment for preparing PVC cable material particles. Background Art

[0002] Wire and cable products have brought great convenience and improvement to human life and work. Among them, PVC cables have long occupied an important position in wire and cable insulation protection materials due to their low price and excellent performance. During the production of cables, an insulating layer is usually coated on the outer layer of the conductive core, which plays a role in protecting the internal conductive core and providing insulation.

[0003] In the existing production process of PVC cable materials, the PVC resin selected is usually prepared by suspension polymerization or emulsion polymerization methods, and solvents or dispersing media are usually used. Some impurities may be introduced during the reaction, such as residual solvents, dispersants, initiators, etc., resulting in relatively low resin purity. The PVC resin particles prepared by these two methods have irregular shapes and a wide particle size distribution, which affect the mixing uniformity and fluidity, resulting in unstable cable material performance. Due to the large amount of impurities in the PVC resin, it is easily decomposed and discolored when heated during processing, and has poor thermal stability. At the same time, the impurities will reduce the electrical insulation performance, posing a safety hazard when used in cable materials.

[0004] Regarding the above related technologies, the inventor believes that in the existing production process of PVC cable materials, due to the relatively large amount of impurities in the prepared PVC resin, the performance of PVC cable materials is low. Summary of the Invention

[0005] In order to solve the above problems, the present application provides a method and equipment for preparing PVC cable material particles.

[0006] In the first aspect, the present application provides a method for preparing PVC cable material particles, adopting the following technical solution:

[0007] A kind of A, comprising: 1. including the following raw materials in parts by mass: 100 parts of high-purity PVC resin, 30 - 45 parts of dioctyl phthalate, 3 - 5 parts of calcium-zinc composite stabilizer, 0.5 - 1 part of ultraviolet absorber, 10 - 25 parts of calcium carbonate, 0.5 - 1.5 parts of stearic acid, 25 - 45 parts of aluminum hydroxide;

[0008] The preparation method includes the following steps:

[0009] S1. Batching: Accurately weigh each component, add the high-purity PVC resin into a high-speed mixer, and then successively add dioctyl phthalate, calcium-zinc composite stabilizer, ultraviolet absorber, calcium carbonate, stearic acid, and aluminum hydroxide;

[0010] S2. High-speed stirring: Start the high-speed mixer and stir at a temperature of 100 - 120°C for 10 - 15 minutes;

[0011] S3. Cooling and stirring: Transfer the material after high-speed stirring to a cooling mixer for cooling and stirring to reduce the material temperature below 40°C;

[0012] S4. Extrusion: Convey the cooled material to a twin-screw extruder. After the material is melted, plasticized, and homogenized in the extruder, it is extruded into strip-shaped material through a die head;

[0013] S5. Pelletizing: The granulator cuts the strip-shaped material into granules.

[0014] Preferably, the preparation method of the high-purity PVC resin includes the following steps:

[0015] A1. Batching: Weigh vinyl chloride monomer, diisopropyl peroxydicarbonate, and dodecyl mercaptan, and their mass ratio is 100:0.05 - 0.2:0.01 - 0.05;

[0016] A2. Pre-polymerization: Add 75% of the total amount of vinyl chloride monomer, 40% of the total amount of initiator, and 100% of the total amount of dodecyl mercaptan to the pre-polymerization kettle. Control the temperature at 40 - 60°C, the stirring speed at 100 - 300 r / min, and pre-polymerize for 0.5 - 2 hours;

[0017] A3. Polymerization: Transfer the pre-polymerized material to the polymerization kettle, add the remaining vinyl chloride monomer and initiator, raise the temperature to 50 - 80°C, control the pressure at 0.8 - 1.5 MPa, the stirring speed at 50 - 150 r / min, and react for 4 - 10 hours;

[0018] A4. Degassing: After the polymerization is completed, transfer the material to a multi-stage flash tank for degassing to remove the unreacted vinyl chloride monomer;

[0019] A5. Post-treatment: The degassed material is evenly fed into the drying tube through a feeding device, and hot air at 80 - 120°C is introduced into the drying tube for 15 - 30 min to remove the residual moisture and obtain high-purity PVC resin.

[0020] Preferably, the purity of the vinyl chloride monomer is greater than 99.99%.

[0021] Preferably, the temperature of the first-stage flash tank of the multi-stage flash tank is 60 - 80°C, the pressure is 0.1 - 0.3 MPa, the temperature and pressure of the subsequent flash tanks gradually decrease, and the temperature of the last-stage flash tank is 40 - 60°C, and the pressure is 0.01 - 0.05 MPa.

[0022] Preferably, the raw material mass ratio range value and the process parameter range value of the PVC cable compound particles and the high-purity PVC resin are both intelligently determined by a pre-set ratio control model according to the order information, and specifically include the following steps:

[0023] Obtain the order information to be produced, where the order information includes order quantity information, order price information, order use, and PVC performance requirement information;

[0024] Based on the order information, predict and determine the optimal raw material mass ratio and the optimal process parameters of the PVC cable compound particles and the pure PVC resin for the order through a pre-set ratio control model; the ratio control model is a neural network model obtained through deep learning training using historical production data and historical order information;

[0025] Obtain the production data of historical orders with the same order use as the order information to be produced, and generate the raw material mass ratio range value and the process parameter range value of the PVC cable compound particles and the high-purity PVC resin through production optimization decision-making by the ratio control model.

[0026] Preferably, the step of obtaining the production data of historical orders with the same order use as the order information to be produced and generating the raw material mass ratio range value and the process parameter range value of the PVC cable compound particles and the high-purity PVC resin through production optimization decision-making by the ratio control model specifically includes the following steps:

[0027] Screen out the production data of historical orders with the same use in the pre-set historical order database; the historical order production data includes historical order information, formula information, production data information, feeding data information, production error information, and product performance detection information;

[0028] Perform data processing on the obtained production data of historical orders;

[0029] Input the processed production data of historical orders into the ratio control model for production optimization decision-making to generate the raw material mass ratio range value and the process parameter range value of the PVC cable compound particles and the high-purity PVC resin.

[0030] Preferably, the step of performing data processing on the obtained production data of historical orders specifically includes the following steps:

[0031] Perform data cleaning on the obtained production data of historical orders;

[0032] Perform normalization processing on the cleaned production data of historical orders;

[0033] Perform encoding processing on the non-numerical features of the production data of historical orders.

[0034] Second aspect, the present application provides a PVC cable material particle preparation device, adopting the following technical solutions:

[0035] A PVC cable material particle preparation device, the multi-stage flash evaporation tank in step A4 includes:

[0036] Multiple serially connected flash evaporation chambers, and the discharge port of the previous flash evaporation chamber in adjacent flash evaporation chambers is connected to the feed port of the next flash evaporation chamber, and the steam outlet of the previous flash evaporation chamber is connected to the steam inlet of the next flash evaporation chamber;

[0037] A steam heating device, including a steam generator and multiple steam mixers, the steam generator is connected to the steam inlet of the first-stage flash evaporation chamber, and each group of adjacent flash evaporation chambers is connected to multiple steam mixers in one-to-one correspondence, for mixing and modulating the steam discharged from the adjacent flash evaporation chambers;

[0038] A degassing controller, used to generate a steam control scheme according to the process parameters of the order, and control the steam heating device to introduce steam meeting the process parameters into multiple serially connected flash evaporation chambers according to the steam control scheme, for degassing the material to remove unreacted vinyl chloride monomer; the steam control scheme includes steam control parameters and a degassing process flow.

[0039] Preferably, the steam mixer includes a box body and an electric heating component arranged in the box body for heating the steam. The box body is connected with a first steam inlet pipe, a second steam inlet pipe, a first steam outlet pipe and a second steam outlet pipe. The first steam inlet pipe is connected to the steam outlet of the previous flash evaporation chamber in the adjacent flash evaporation chambers, and the second steam inlet pipe is connected to the steam outlet of the next flash evaporation chamber in the adjacent flash evaporation chambers; the first steam outlet pipe is connected to the steam inlet of the next flash evaporation chamber in the adjacent flash evaporation chambers, and the second steam outlet pipe is communicated with the steam generator;

[0040] The first inlet pipe is connected with a first steam distribution component. The first steam distribution pipe includes a main pipe and multiple steam distribution sub-pipes arranged around each other in opposite directions, and steam outlets are arranged on one side where the multiple steam distribution sub-pipes are arranged in opposite directions;

[0041] The second inlet pipe is connected with a second steam distribution pipe. The end of the second steam distribution pipe is closed and multiple groups of steam outlets are arranged along its circumferential direction;

[0042] The second steam distribution pipe is inserted between multiple steam distribution sub-pipes, and the multiple groups of steam outlets of the second steam distribution pipe are arranged in one-to-one correspondence with the steam outlets of the multiple steam distribution sub-pipes.

[0043] Preferably, the degassing controller generating a steam control scheme according to the process parameters of the order specifically includes the following steps:

[0044] The degassing controller obtains the steam change information of each flash chamber according to the process parameters of the order. The steam change information includes the required steam temperature information and the predicted discharged steam temperature information.

[0045] The steam prediction information is screened based on the steam change information of each flash chamber. The steam prediction information includes the flash chambers where the discharged steam needs to be mixed and the flash chambers where the discharged steam needs to be heated.

[0046] Based on the steam change information and the steam prediction information, a steam control scheme is planned and generated through a pre-set scheme planning model. The scheme planning model is a machine learning model constructed based on the dynamic programming algorithm and trained and iterated through historical data.

[0047] In summary, the present application includes at least one of the following beneficial technical effects:

[0048] 1. Using high-purity PVC resin as the base material and carefully adjusting the proportions of other raw materials, PVC cable material particles are prepared, which can comprehensively improve the performance of PVC cable material particles; it can effectively avoid the problems of easy decomposition, discoloration, and poor thermal stability during processing of PVC cable material particles caused by more impurities in the PVC resin.

[0049] 2. Through the proportion control model, according to the order usage and PVC performance requirement information, the best raw material mass ratio and process parameters are intelligently determined. Then, by obtaining the production data of historical orders with the same usage, the range values of the raw material mass ratio and process parameters are generated. On the basis of reducing the production difficulty, it can also ensure that the products produced within this range still meet the order performance requirements, maintain the product quality stability, and reduce product quality problems caused by parameter fluctuations.

[0050] 3. By generating a steam control scheme based on the steam change information and the steam prediction information through the scheme planning model, on the basis of ensuring that the materials can achieve the best flashing effect in each flash chamber, the heat energy of the superheated steam is recovered, realizing the full utilization of the steam heat energy and achieving the effect of environmental protection. Description of the Drawings

[0051] Figure 1 is a flowchart of a method for preparing PVC cable material particles in an embodiment of the present application;

[0052] Figure 2 is a flowchart of a method for preparing high-purity PVC resin in an embodiment of the present application;

[0053] Figure 3 is a flowchart of a method for the proportion control model to intelligently determine the range values of the raw material mass ratio of PVC cable material particles and high-purity PVC resin according to order information in an embodiment of the present application;

[0054] Figure 4 It is a flowchart of the method for determining the range value in the production optimization decision-making by the ratio control model in the embodiment of the present application;

[0055] Figure 5 It is a flowchart of the method for data processing of the production data of historical orders in the embodiment of the present application;

[0056] Figure 6 It is a schematic diagram of the steam transmission structure of a PVC cable compound particle preparation device in the embodiment of the present application;

[0057] Figure 7 It is a schematic cross-sectional view of the steam mixer in the embodiment of the present application;

[0058] Figure 8 It is a flowchart of the method for generating a steam control scheme in the embodiment of the present application.

[0059] Explanation of reference numerals: 1. Flash evaporation chamber; 2. Steam generator; 3. Steam mixer; 31. Box body; 32. First steam inlet pipe; 33. Second steam inlet pipe; 34. First steam outlet pipe; 35. Second steam outlet pipe; 36. First steam distribution component; 361. Steam distribution sub-pipe; 37. Second steam distribution pipe. Detailed implementation manners

[0060] The following further describes the present application in detail Figure 1-8 in conjunction with the accompanying drawings.

[0061] The embodiment of the present application discloses a method for preparing PVC cable compound particles. Referring to Figure 1 , a method for preparing PVC cable compound particles includes the following raw materials in parts by mass: 100 parts of high-purity PVC resin, 30 - 45 parts of dioctyl phthalate, 3 - 5 parts of calcium-zinc composite stabilizer, 0.5 - 1 part of ultraviolet absorber, 10 - 25 parts of calcium carbonate, 0.5 - 1.5 parts of stearic acid, and 25 - 45 parts of aluminum hydroxide;

[0062] The preparation method includes the following steps:

[0063] S1. Batching: Accurately weigh various components, add the high-purity PVC resin into a high-speed mixer, and then sequentially add dioctyl phthalate, calcium-zinc composite stabilizer, ultraviolet absorber, calcium carbonate, stearic acid, and aluminum hydroxide;

[0064] S2. High-speed stirring: Turn on the high-speed mixer and stir at a temperature of 100 - 120 °C for 10 - 15 minutes; make each component fully mixed evenly, and the material presents a loose and uniform powder state;

[0065] S3. Cooling and Stirring: Transfer the material after high-speed stirring to a cooling mixer for cooling and stirring to reduce the material temperature below 40°C, preventing premature cross-linking or decomposition of the material due to overheating during subsequent processing.

[0066] S4. Extrusion: Convey the cooled material to a twin-screw extruder. After melting, plasticizing, and homogenizing in the extruder, the material is extruded into strip-shaped material through a die head.

[0067] S5. Pelletizing: The granulator cuts the strip-shaped material into granules. Using high-purity PVC resin as the base material and carefully adjusting the proportions of other raw materials, PVC cable material granules are prepared, which can comprehensively improve the performance of PVC cable material granules. For example, dioctyl phthalate as a plasticizer can effectively improve the flexibility of PVC, making it suitable for cables in various bending situations; aluminum hydroxide provides good flame retardancy to ensure the safety of cables in dangerous situations such as fires; calcium carbonate can reduce costs while enhancing the hardness and dimensional stability of the cable material. It can effectively avoid problems such as easy decomposition, color change, and poor thermal stability of PVC cable material granules during processing due to more impurities in the PVC resin.

[0068] Refer to Figure 2 , and the preparation method of the high-purity PVC resin includes the following steps:

[0069] A1. Batching: Weigh vinyl chloride monomer, diisopropyl peroxydicarbonate, and dodecyl mercaptan, with a mass ratio of 100:0.05 - 0.2:0.01 - 0.05; among them, the purity of vinyl chloride monomer is greater than 99.99%.

[0070] A2. Pre-polymerization: Add 75% of the total amount of vinyl chloride monomer, 40% of the total amount of initiator, and 100% of the total amount of dodecyl mercaptan to the pre-polymerization kettle, control the temperature at 40 - 60°C, the stirring speed at 100 - 300 r / min, and pre-polymerize for 0.5 - 2 hours.

[0071] A3. Polymerization: Transfer the pre-polymerized material to the polymerization kettle, add the remaining vinyl chloride monomer and initiator, raise the temperature to 50 - 80°C, control the pressure at 0.8 - 1.5 MPa, the stirring speed at 50 - 150 r / min, and react for 4 - 10 hours.

[0072] A4. Degassing: After polymerization, transfer the material to a multi-stage flash tank for degassing to remove unreacted vinyl chloride monomer; among them, the temperature of the first-stage flash tank of the multi-stage flash tank is 60 - 80°C, the pressure is 0.1 - 0.3 MPa, the temperature and pressure of subsequent flash tanks gradually decrease, and the temperature of the final-stage flash tank is 40 - 60°C, and the pressure is 0.01 - 0.05 MPa.

[0073] A5. Post-treatment: The degassed material is evenly fed into the drying tube through a feeding device. Hot air at 80 - 120 °C is introduced into the drying tube for 15 - 30 min to remove residual moisture, obtaining high-purity PVC resin. Through the above steps, high-purity PVC resin is prepared by bulk polymerization. Compared with other polymerization methods (such as suspension polymerization, emulsion polymerization, etc.), the process of bulk polymerization is relatively simple. No solvent or water is used as the reaction medium during the preparation process, avoiding impurities brought by the solvent or water. During the entire polymerization process, mainly vinyl chloride monomer undergoes polymerization reaction by itself, reducing the chance of introducing foreign impurities and further improving the purity of PVC resin. It can meet the application scenarios with strict purity requirements, such as applications in high-end cables, medical equipment, etc. The effect of effectively improving the purity of PVC resin is achieved.

[0074] In addition, in step 2, strictly controlling the addition amounts of 75% of the total amount of vinyl chloride monomer, 40% of the total amount of initiator, and all dodecyl mercaptan helps to form a suitable polymer chain structure and create good conditions for subsequent polymerization reactions.

[0075] Refer to Figure 3 , the range values of the raw material mass ratio and the process parameter range values of the PVC cable material particles and high-purity PVC resin are both intelligently determined by a pre-set ratio control model according to the order information, specifically including the following steps:

[0076] B1. Obtain the order information to be produced, where the order information includes order quantity information, order price information, order usage, and PVC performance requirement information;

[0077] B2. Predict the optimal raw material mass ratio and the optimal process parameters: Based on the order information, predict and determine the optimal raw material mass ratio and the optimal process parameters of the PVC cable material particles and high-purity PVC resin for the order through a pre-set ratio control model; the ratio control model is a neural network model obtained through deep learning training using historical production data and historical order information; it should be noted that the specific training steps of the neural network model are prior art and will not be elaborated here;

[0078] B3. Determine the range values of raw material mass ratios and process parameter ranges: Obtain the production data of historical orders that are consistent with the order purpose of the order to be produced. Through the ratio control model, make production optimization decisions to generate the range values of the raw material mass ratios of PVC cable material particles and high-purity PVC resin, as well as the process parameter ranges. According to the order purpose and PVC performance requirement information, the ratio control model makes intelligent decisions on the best-matched raw material mass ratios and process parameters, and then generates the range values of the raw material mass ratios and process parameters by obtaining the production data of historical orders with the same purpose. In actual production, due to factors such as raw material batch differences and equipment fluctuations, it may be difficult to strictly execute according to the optimal values. The range values provide an operating space to ensure production flexibility. The range values are optimized and decided by the model to ensure that the products produced within this range can still meet the order performance requirements, maintain product quality stability, and reduce product quality problems caused by parameter fluctuations.

[0079] Refer to Figure 4 , the specific steps for obtaining the production data of historical orders that are consistent with the order purpose of the order to be produced and making production optimization decisions through the ratio control model to generate the range values of the raw material mass ratios of PVC cable material particles and high-purity PVC resin, as well as the process parameter ranges are as follows:

[0080] C1. Screen historical orders: Screen out the production data of historical orders with the same purpose in the pre-set historical order database according to the order purpose of the order to be produced; the historical order production data includes historical order information, formula information, production data information, feeding data information, production error information, and product performance detection information.

[0081] C2. Data processing: Perform data processing on the obtained production data of historical orders.

[0082] C3. Generate range values: Input the processed production data of historical orders into the ratio control model to make production optimization decisions to generate the range values of the raw material mass ratios of PVC cable material particles and high-purity PVC resin, as well as the process parameter ranges. Through the ratio control model, the complex non-linear relationships between various types of data can be deeply explored, and the impacts of various factors on production can be fully considered. Thus, based on the best raw material mass ratios and process parameters, the range values of the raw material mass ratios of PVC cable material particles and high-purity PVC resin, as well as the process parameter ranges are accurately generated, thereby realizing the optimization of the production process. On the basis of ensuring a certain elastic space for actual production, the product quality stability and production efficiency are improved.

[0083] Refer to Figure 5 , the specific steps for performing data processing on the obtained production data of historical orders are as follows:

[0084] D1. Data cleaning: Clean the production data of the historical orders obtained.

[0085] D2. Normalization processing: Perform normalization processing on the production data of the historical orders after cleaning.

[0086] D3. Encoding processing: Encode the non-numerical features of the production data of the historical orders. By processing the production data of the historical orders, ensure that the data truly reflects the production situation, provide a reliable basis for subsequent analysis, and avoid analysis deviations caused by data problems.

[0087] The embodiment of the present application also discloses a PVC cable material particle preparation device. Refer to Figure 6 A PVC cable material particle preparation device is the multi-stage flash evaporation tank in the above step A4. The multi-stage flash evaporation tank includes: a plurality of flash chambers 1 connected in series, a steam heating device, and a degassing controller. And the discharge port of the previous flash chamber 1 in the adjacent flash chambers 1 is connected to the feed port of the next flash chamber 1, and the steam outlet of the previous flash chamber 1 is connected to the steam inlet of the next flash chamber 1. The steam heating device includes a steam generator 2 and a plurality of steam mixers 3. The steam generator 2 is connected to the steam inlet of the first-stage flash chamber 1, and each group of adjacent flash chambers 1 is connected to a plurality of steam mixers 3 in one-to-one correspondence, for mixing and modulating the steam discharged from the adjacent flash chambers 1. Additionally, a flow pump can be set on the pipeline to control the steam flow direction and flow rate. The degassing controller is used to generate a steam control scheme according to the process parameters of the order, and control the steam heating device to introduce steam that meets the process parameters into the plurality of flash chambers 1 connected in series to perform degassing treatment on the material and remove unreacted vinyl chloride monomers; the steam control scheme includes steam control parameters and a degassing process flow. The degassing controller generates a steam control scheme according to the process parameters of the order, controls the steam heating device to achieve customized degassing treatment, can meet the degassing processing requirements of various orders, and at the same time mixes and modulates the steam discharged from the adjacent flash chambers 1 through a plurality of steam mixers 3. Based on the process requirements, when the temperature of the steam discharged from the flash chamber 1 is much higher than the temperature requirement of the next-stage flash chamber 1, mix this steam with the low-temperature steam discharged from the next-stage flash chamber 1 to generate more steam that meets the temperature requirement of the next-stage flash chamber 1, and the surplus steam can be recycled to the steam generator 2 to achieve full recovery of heat energy and improve energy utilization efficiency.

[0088] Refer to Figure 6, the steam mixer 3 includes a box body 31 and an electric heating component arranged in the box body 31 for heating steam. The box body 31 is connected with a first steam inlet pipe 32, a second steam inlet pipe 33, a first steam outlet pipe 34 and a second steam outlet pipe 35. The first steam inlet pipe 32 is connected with the steam outlet of the previous flash chamber 1 in the adjacent flash chambers 1, and the second steam inlet pipe 33 is connected with the steam outlet of the next flash chamber 1 in the adjacent flash chambers 1; the first steam outlet pipe 34 is connected with the steam inlet of the next flash chamber 1 in the adjacent flash chambers 1, and the second steam outlet pipe 35 is communicated with the steam generator 2. When the temperature of the steam discharged from the flash chamber 1 is lower than the temperature requirement of the next-level flash chamber 1, the steam is heated by the electric heating component and then introduced into the next-level flash chamber 1, so as to ensure that the material can achieve the best flash evaporation effect in each flash chamber 1 on the basis of fully recovering heat energy, and further optimize the degassing process.

[0089] Refer to Figure 7 , the first inlet pipe is connected with a first steam distribution component 36. The first steam distribution pipe includes a main pipe and a plurality of steam distribution sub-pipes 361 that are arranged in a surrounding manner in opposite directions, and steam outlets are formed on one side where the plurality of steam distribution sub-pipes 361 are arranged in opposite directions; the second inlet pipe is connected with a second steam distribution pipe 37. The end of the second steam distribution pipe 37 is closed and a plurality of groups of steam outlets are formed along its circumferential direction; the second steam distribution pipe 37 is inserted between the plurality of steam distribution sub-pipes 361, and the plurality of groups of steam outlets of the second steam distribution pipe 37 are arranged in one-to-one correspondence with the steam outlets of the plurality of steam distribution sub-pipes 361. Through the arrangement of the first steam distribution component 36 and the second steam distribution pipe 37, when the heat energy of the overheated discharged steam needs to be utilized, the steam of two temperatures forms convection, which can effectively accelerate the steam mixing efficiency.

[0090] Refer to Figure 8 , the steam control scheme generated by the degassing controller according to the process parameters of the order specifically includes the following steps:

[0091] E1. Obtain steam change information: The degassing controller obtains the steam change information of each flash chamber according to the process parameters of the order. The steam change information includes the required steam temperature information and the predicted discharged steam temperature information;

[0092] E2. Screen to obtain steam prediction information: According to the steam change information of each flash chamber, screen to obtain steam prediction information, and the steam prediction information includes the flash chamber where the discharged steam needs to be mixed and the flash chamber where the discharged steam needs to be heated;

[0093] E3. Planning and generating a steam control scheme: According to the steam change information and the steam prediction information, a steam control scheme is planned and generated through a pre-set scheme planning model. The scheme planning model is a machine learning model constructed based on the dynamic programming algorithm and trained and iterated through historical data. By using the scheme planning model to generate a steam control scheme based on the steam change information and the steam prediction information, on the basis of ensuring that the material can achieve the best flashing effect in each flash chamber, the heat energy of the superheated steam is recovered, the full utilization of the steam heat energy is realized, and the effect of environmental protection is achieved.

[0094] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still, without conflict, make combinations, additions, deletions or other adjustments to the features in the embodiments of the present invention according to the situation without creative efforts, so as to obtain different technical solutions that do not deviate from the concept of the present invention in essence. These technical solutions also belong to the scope of protection of the present invention.

Claims

1. A method for preparing PVC cable material particles, characterized in that: The invention comprises the following raw materials in parts by weight: 100 parts of high-purity PVC resin, 30-45 parts of dioctyl phthalate, 3-5 parts of calcium-zinc composite stabilizer, 0.5-1 parts of ultraviolet absorber, 10-25 parts of calcium carbonate, 0.5-1.5 parts of stearic acid, and 25-45 parts of aluminum hydroxide; The preparation method comprises the following steps: S1. Ingredients: Accurately weigh various components, add high-purity PVC resin into a high-speed mixer, and then add dioctyl phthalate, calcium zinc composite stabilizer, ultraviolet absorber, calcium carbonate, stearic acid and aluminum hydroxide in sequence; S2. High-speed stirring: Turn on the high-speed stirrer and stir at a temperature of 100-120°C for 10-15 minutes; S3, cooling and stirring: transfer the material after high-speed stirring to a cooling and stirring machine for cooling and stirring to reduce the material temperature to below 40°C; S4, extrusion: conveying the cooled material to a twin-screw extruder, where the material is melted, plasticized, and homogenized, and then extruded into a strip-shaped material through a die head; S5. Granulation: The granulator cuts the strip-shaped material into granules.

2. The method for preparing PVC cable material particles according to claim 1, characterized in that: The preparation method of the high-purity PVC resin comprises the following steps: A1. Ingredients: Weigh vinyl chloride monomer, diisopropyl peroxydicarbonate and dodecanethiol in a mass ratio of 100:0.05-0.2:0.01-0.05; A2, prepolymerization: 75% of the total amount of vinyl chloride monomer, 40% of the total amount of initiator and 100% of the total amount of dodecanethiol are added to the prepolymerization kettle, the temperature is controlled at 40-60°C, the stirring speed is 100-300r / min, and the prepolymerization is carried out for 0.5-2 hours; A3. Polymerization: transfer the prepolymerized material to a polymerization kettle, add the remaining vinyl chloride monomer and initiator, raise the temperature to 50-80°C, control the pressure at 0.8-1.5MPa, stir at 50-150r / min, and react for 4-10 hours; A4. Degassing: After the polymerization is completed, the material is transferred to a multi-stage flash tank for degassing to remove unreacted vinyl chloride monomer; A5. Post-treatment: The degassed material is evenly fed into the drying tube through the feeding device. Hot air at 80-120℃ is introduced into the drying tube for 15-30 minutes to remove residual moisture and obtain high-purity PVC resin.

3. A method for preparing PVC cable material particles according to claim 2, characterized in that: The purity of the vinyl chloride monomer is greater than 99.99%.

4. The method for preparing PVC cable material particles according to claim 2, characterized in that: The temperature of the first stage flash tank of the multi-stage flash tank is 60-80°C and the pressure is 0.1-0.3MPa. The temperature and pressure of the subsequent stages of flash tanks are gradually reduced, and the temperature of the final stage of flash tank is 40-60°C and the pressure is 0.01-0.05MPa.

5. The method for preparing PVC cable material particles according to claim 1, characterized in that: The raw material mass ratio range value of the PVC cable material particles and the high-purity PVC resin and the process parameter range value are generated by intelligent decision-making according to order information through a preset ratio control model, which specifically includes the following steps: Obtaining order information to be produced, the order information including order quantity information, order price information, order purpose, and PVC performance requirement information; Based on the order information, the optimal raw material mass ratio and the optimal process parameters of the PVC cable material particles and the purity PVC resin of the decision order are predicted through a preset ratio control model; the ratio control model is a neural network model obtained by deep learning training through historical production data and historical order information; Obtain production data of historical orders that are consistent with the purpose of the order information to be produced, and make production optimization decisions through the proportion control model to generate the raw material mass ratio range value and process parameter range value of PVC cable material particles and high-purity PVC resin.

6. A method for preparing PVC cable material particles according to claim 5, characterized in that: The method of obtaining production data of historical orders that are consistent with the purpose of the order information to be produced, and generating a raw material mass ratio range value of PVC cable material particles and high-purity PVC resin and a process parameter range value through a proportional control model for production optimization decision-making specifically includes the following steps: The purpose of the order to be produced is to select historical order production data with the same purpose from a preset historical order database; the historical order production data includes historical order information, formula information, production data information, material cutting data information, production error information and product performance detection information; Process the production data of historical orders obtained; The processed production data of historical orders is input into the proportional control model to make production optimization decisions and generate the raw material mass ratio range values ​​of PVC cable material particles and high-purity PVC resin and the process parameter range values.

7. A method for preparing PVC cable material particles according to claim 6, characterized in that: The data processing of the acquired production data of historical orders specifically includes the following steps: Clean the production data of historical orders obtained; Normalize the production data of the cleaned historical orders; Encode the non-numeric features of production data of historical orders.

8. A PVC cable material particle preparation device, characterized in that: The multi-stage flash tank in step A4 comprises: A plurality of flash chambers (1) connected in series, wherein the discharge port of the preceding flash chamber (1) of the adjacent flash chambers (1) is connected to the feed port of the following flash chamber (1), and the steam outlet of the preceding flash chamber (1) is connected to the steam inlet of the following flash chamber (1); A steam heating device, comprising a steam generator (2) and a plurality of steam mixers (3), wherein the steam generator (2) is connected to a steam inlet of a first-stage flash chamber (1), and each group of adjacent flash chambers (1) is connected to the plurality of steam mixers (3) in a one-to-one correspondence, and is used to mix and modulate steam discharged from adjacent flash chambers (1); A degassing controller is used to generate a steam control plan according to the process parameters of the order, and control the steam heating device to pass steam that meets the process parameters into multiple flash chambers (1) connected in series according to the steam control plan, so as to degas the material and remove unreacted vinyl chloride monomer; the steam control plan includes steam control parameters and a degassing process flow.

9. A PVC cable material particle preparation device according to claim 8, characterized in that: The steam mixer (3) comprises a housing (31) and an electric heating assembly arranged in the housing (31) for heating steam. The housing (31) is connected with a first steam inlet pipe (32), a second steam inlet pipe (33), a first steam outlet pipe (34) and a second steam outlet pipe (35). The first steam inlet pipe (32) is connected to the steam outlet of a preceding flash chamber (1) among adjacent flash chambers (1), and the second steam inlet pipe (33) is connected to the steam outlet of a succeeding flash chamber (1) among adjacent flash chambers (1); the first steam outlet pipe (34) is connected to the steam inlet of a succeeding flash chamber (1) among adjacent flash chambers (1), and the second steam outlet pipe (35) is in communication with a steam generator (2); The first inlet pipe is connected to a first steam separation component (36), the first steam separation pipe comprises a main pipe and a plurality of steam separation sub-pipes (361) arranged to surround each other, and a steam outlet is provided on one side of the plurality of steam separation sub-pipes (361) arranged to face each other; The second inlet pipe is connected to a second steam distribution pipe (37), the second steam distribution pipe (37) has a closed end and has a plurality of steam outlets arranged along its circumference; The second steam distribution pipe (37) is inserted between the multiple steam distribution sub-pipes (361), and the multiple groups of steam outlets of the second steam distribution pipe (37) are arranged in a one-to-one correspondence with the steam outlets of the multiple steam distribution sub-pipes (361).

10. The PVC cable material particle preparation device according to claim 9, characterized in that: The degassing controller generates a steam control scheme according to the process parameters of the order, which specifically includes the following steps: The degassing controller obtains steam change information of each flash chamber according to the process parameters of the order, wherein the steam change information includes required steam temperature information and expected exhaust steam temperature information; Steam prediction information is obtained by screening steam change information of each level of flash chambers, wherein the steam prediction information discharges the flash chambers that need to be mixed with the steam and the flash chambers that need to be heated with the steam; A steam control plan is generated according to steam change information and steam prediction information through a preset plan planning model. The plan planning model is a machine learning model built based on a dynamic programming algorithm and iterated through historical data training.

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