Food plastic cup injection molding processing intelligent control system

Abstract

The invention belongs to the technical field of injection molding processing control, and relates to an intelligent control system for injection molding processing of a food plastic cup. According to the method, by obtaining the reference process parameters of the target food plastic cup in each processing process, it is ensured that each processing process is carried out according to the optimal parameters, the production efficiency and the product quality are improved, and by analyzing the matching degree of the process parameters of the target food plastic cup in each processing process and comparing the actual process parameters with the reference process parameters, the product quality is improved. The production process of the target food plastic cup is accurately controlled, abnormal conditions in the processing process can be found in time, corrective measures are taken, the consistency and stability of products are guaranteed, and by judging and controlling the technological parameter control requirements of the target food plastic cup in each processing process, abnormal changes in the processing process can be rapidly responded, and the production efficiency of the target food plastic cup is improved. And technological parameters are adjusted in time, the continuity and stability of the production process are ensured, and defective products and waste products can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding process control, and relates to an intelligent control system for injection molding of food plastic cups. Background Art

[0002] In today's digital wave of manufacturing, the injection molding industry is undergoing a transformation and upgrading with the goal of improving efficiency, reducing costs, and enhancing product competitiveness. As a type of injection molding product, the production process of food plastic cups also faces the same challenges and opportunities. Traditional injection molding processing methods have problems such as low production efficiency, high energy consumption, and unstable product quality, which makes it difficult to meet the requirements of modern manufacturing for high efficiency, energy saving, and environmental protection. Therefore, the introduction of intelligent control systems has become an important way to solve these problems.

[0003] The traditional injection molding processing method of food plastic cups can basically meet the use requirements, but there are still certain shortcomings: (1) The traditional injection molding processing method of food plastic cups mainly sets the process parameters on the injection molding machine, and then performs a series of machine processing operations to obtain the food plastic cups. However, the traditional injection molding processing method of food plastic cups ignores the fact that the basic information of the food plastic cups obtained in each step during the actual processing may be inconsistent, so it is impossible to adjust the process parameters of the next processing process according to the actual situation, and thus it is impossible to ensure that each processing process is carried out according to the optimized parameters, and it is impossible to improve production efficiency and product quality.

[0004] (2) The traditional injection molding processing method of food plastic cups also lacks the ability to compare the actual process parameters of the food plastic cups in each processing step with the reference process parameters obtained through analysis, making it impossible to detect abnormal conditions in the processing step, and further unable to accurately control the production process of the food plastic cups, which is not conducive to avoiding quality problems in the processing step and is unable to ensure product consistency and stability.

[0005] (3) The traditional injection molding processing method of food plastic cups cannot respond quickly to abnormal changes in the processing process and adjust the process parameters in time, thus failing to ensure the continuity and stability of the production process, which is not conducive to reducing the generation of defective and waste products. Summary of the invention

[0006] In view of this, in order to solve the problems raised in the above background technology, an intelligent control system for injection molding of food plastic cups is now proposed.

[0007] The purpose of the present invention can be achieved through the following technical solutions: The present invention provides an intelligent control system for injection molding of food plastic cups, including: a reference process parameter acquisition module, an actual process parameter detection module, a process parameter matching degree analysis module, a control demand judgment module, a control terminal and an information library.

[0008] A reference process parameter acquisition module is used to record the monitored target type of food plastic cup as the target food plastic cup, and record the basic information of the target food plastic cup corresponding to the product obtained in each injection molding process as the basic product information of the target food plastic cup in each process, thereby obtaining the reference process parameters of the target food plastic cup in each process, wherein each process includes plasticizing process, injection process, pressure holding process, cooling process and demolding process.

[0009] The actual process parameter detection module is used to perform real-time detection on the target food plastic cup in each processing process to obtain the actual process parameters of the target food plastic cup in each processing process.

[0010] The process parameter matching analysis module is used to analyze the process parameter matching of the target food plastic cup in each processing process.

[0011] The control demand judgment module is used to judge the process parameter control demand of the target food plastic cup in each processing process. If it is a control demand, the control terminal is executed; if it is not a control demand, the reference process parameter acquisition module is executed.

[0012] The control terminal is used to control the process parameters of the target food plastic cup in each processing process.

[0013] The information base is used to store the plastic melt fluidity corresponding to each plastic melt viscosity, store the standard plastic melt fluidity and reference plastic cup design volume of the target food plastic cup in the injection molding process, store the reference process parameters corresponding to each raw material evaluation coefficient in the plasticizing process, the reference process parameters corresponding to each product evaluation coefficient in the injection process, cooling process and demolding process, and the reference process parameters corresponding to each product evaluation coefficient at each measuring point in the early pressure holding process.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention obtains the basic product information of the target food plastic cup in each processing process, and then obtains the reference process parameters of the target food plastic cup in each processing process, ensuring that each processing flow is carried out according to the optimized parameters, thereby improving production efficiency and product quality.

[0015] 2. The present invention obtains the actual process parameters of the target food plastic cup in each processing process, analyzes the matching degree of the process parameters of the target food plastic cup in each processing process, and compares the actual process parameters with the reference process parameters. This helps to accurately control the production process of the target food plastic cup, and is conducive to timely discovering abnormal situations in the processing process and taking measures to correct them, so as to avoid quality problems in the processing process and ensure the consistency and stability of the product.

[0016] 3. The present invention determines the process parameter control requirements of the target food plastic cup in each processing process and controls the process parameters, which helps to quickly respond to abnormal changes in the processing process and adjust the process parameters in time, thereby ensuring the continuity and stability of the production process, reducing the generation of defective and waste products, and avoiding unnecessary energy consumption and material waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of system module connection of the present invention.

[0019] Figure 2 It is a schematic diagram of the system implementation flow of the present invention.

[0020] Figure 3 It is a schematic diagram of the division of wall thickness measurement points of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figure 1As shown, the present invention provides an intelligent control system for injection molding of food plastic cups, and the specific modules are distributed as follows: reference process parameter acquisition module, actual process parameter detection module, process parameter matching degree analysis module, control demand judgment module, control terminal and information library. Among them, the connection mode between the modules is: the reference process parameter acquisition module is connected with the actual process parameter detection module, the actual process parameter detection module is connected with the process parameter matching degree analysis module, the process parameter matching degree analysis module is connected with the control demand judgment module, the control demand judgment module is connected with the control terminal, and the information library is respectively connected with the reference process parameter acquisition module and the process parameter matching degree analysis module.

[0023] A reference process parameter acquisition module is used to record the monitored target type of food plastic cup as the target food plastic cup, and record the basic information of the target food plastic cup corresponding to the product obtained in each injection molding process as the basic product information of the target food plastic cup in each process, thereby obtaining the reference process parameters of the target food plastic cup in each process, wherein each process includes plasticizing process, injection process, pressure holding process, cooling process and demolding process.

[0024] It needs to be further explained that the system implementation flow diagram is as follows Figure 2 shown.

[0025] As a preferred feasibility example, the basic information of the product in the plasticizing process includes raw material type, raw material purity and raw material moisture content.

[0026] It needs to be further explained that the specific method of obtaining the raw material type, raw material purity and raw material moisture content of the target food plastic cup in the plasticization process is: directly extracting the raw material type, raw material purity and raw material moisture content of the target food plastic cup in the plasticization process from the report of the third-party testing agency of the raw materials.

[0027] The basic information of the product during the injection process includes the fluidity of the plastic melt and the designed volume of the plastic cup.

[0028] It needs to be further explained that the specific method of obtaining the plastic melt fluidity of the target food plastic cup during the injection process and the designed volume of the plastic cup is: using the deployed viscometer to directly measure the plastic melt viscosity of the target food plastic cup after the plasticization process, and recording it as the plastic melt viscosity of the target food plastic cup during the injection process, and further comparing it with the plastic melt fluidity corresponding to each plastic melt viscosity stored in the information database to obtain the plastic melt fluidity of the target food plastic cup during the injection process.

[0029] The designed volume of the target food plastic cup during the injection process is directly extracted through the product design drawing of the target food plastic cup.

[0030] The basic product information during the pressure holding process includes the wall thickness of each measuring point of the plastic cup, the shrinkage rate of the plastic cup and the mold temperature.

[0031] It needs to be further explained that the specific method of obtaining the wall thickness at each measuring point of the target food plastic cup during the pressure holding process, the shrinkage rate of the plastic cup and the mold temperature is: using the deployed laser thickness gauge to directly measure the finished food plastic cup of the target food plastic cup after the injection process, and obtain the wall thickness at each measuring point of the plastic cup of the target food plastic cup, which is recorded as the wall thickness at each measuring point of the plastic cup of the target food plastic cup during the pressure holding process.

[0032] It should be noted that the measuring points are measuring points of average interval length set in the vertical direction of the target food plastic cup, such as Figure 3 shown.

[0033] The raw material of the target food plastic cup is used to obtain a cubic plastic test piece of a set volume according to the production method of the target food plastic cup, which is recorded as the test piece corresponding to the raw material of the target food plastic cup. After demolding and cooling to room temperature and stabilization, the lengths of each side of the test piece corresponding to the raw material of the target food plastic cup are measured respectively, and recorded as the lengths of each side of the test piece corresponding to the raw material of the target food plastic cup before demolding and stabilization, respectively. Where i = 1, 2, ..., 12, i is the number of each side length, and the shrinkage rate of the corresponding test piece of the target food plastic cup raw material is analyzed This is recorded as the shrinkage rate of the target food plastic cup during the pressure holding process.

[0034] The temperature sensor is used to directly measure the finished product of the target food plastic cup after the injection process, and the mold temperature of the target food plastic cup is obtained, which is recorded as the mold temperature of the target food plastic cup during the pressure holding process.

[0035] The basic information of the product during the cooling process includes the design volume, specific heat capacity and thermal conductivity of the plastic cup.

[0036] It needs to be further explained that the specific method for obtaining the design volume, specific heat capacity and thermal conductivity of the target food plastic cup during the cooling process is: use the deployed 3D scanning equipment to scan the target food plastic cup after the pressure holding process, obtain the three-dimensional data of the target food plastic cup, and construct it to obtain the three-dimensional model of the target food plastic cup, from which the design volume of the target food plastic cup is obtained, and it is recorded as the design volume of the target food plastic cup during the cooling process.

[0037] The corresponding specific heat capacity and thermal conductivity of the raw materials of the target food plastic cup are directly extracted from the report of the third-party testing agency of the raw materials, and are recorded as the specific heat capacity and thermal conductivity of the target food plastic cup during the cooling process.

[0038] The basic product information during the demoulding process includes the degree of solidification of the plastic cup.

[0039] It needs to be further explained that the specific method of obtaining the degree of solidification of the target food plastic cup during the demolding process is: using a Shore hardness tester to measure the finished food plastic cup of the target food plastic cup after the cooling process, to obtain the hardness of the finished food plastic cup of the target food plastic cup, and record it as the degree of solidification of the target food plastic cup during the demolding process.

[0040] The process parameters in the plasticizing process include temperature and screw speed, the process parameters in the injection process include injection pressure and injection speed, the process parameters in the holding process include holding pressure, holding time and plastic solution addition amount, the process parameters in the cooling process include cooling time, cooling medium temperature and cooling medium speed, and the process parameters in the demolding process include mold opening speed, mold opening angle and mold opening method.

[0041] As a preferred feasibility example, in the process of obtaining the reference process parameters of the target food plastic cup in each processing process, it is necessary to construct the raw material evaluation coefficient of the target food plastic cup in the plasticization process. The specific analysis method is: extract the raw material type of the target food plastic cup in the plasticization process, and match it with the raw material evaluation coefficient influence index corresponding to each raw material type stored in the information database to obtain the raw material evaluation coefficient influence index imp corresponding to the raw material type of the target food plastic cup in the plasticization process.

[0042] The raw material purity and raw material water content of the target food plastic cup during the plasticizing process were extracted and recorded as pur and wc respectively.

[0043] Analyze the raw material evaluation coefficient of the target food plastic cup during the plasticization process Where pur0 and wc0 are the raw material purity threshold and raw material moisture content threshold of the target food plastic cup in the plasticizing process, respectively; μ1 is the minimum value set to prevent the denominator from being 0, and its unit is percentage.

[0044] As a preferred feasibility example, in the process of obtaining the reference process parameters of the target food plastic cup in each processing process, it is necessary to construct the raw material evaluation coefficient of the target food plastic cup in the injection process, the pressure holding process, the cooling process and the demolding process. The specific analysis method is: extract the plastic melt fluidity and the plastic cup design volume of the target food plastic cup in the injection process, which are recorded as flu and vol respectively, and analyze the product evaluation coefficient of the target food plastic cup in the injection process.

[0045] It should be further explained that the specific analysis method of the product evaluation coefficient of the target food plastic cup during the injection process is: according to the analysis formula The product evaluation coefficient Pro1 of the target food plastic cup in the injection process is obtained, where flu0 and vol0 are the standard plastic melt fluidity of the target food plastic cup in the injection molding process and the design volume of the reference plastic cup extracted from the information database, respectively, Δflu0 is the allowable difference between the set plastic melt fluidity and the standard plastic melt fluidity, and μ2 is the set minimum value to prevent the denominator from being 0, and its unit is milliliter.

[0046] Extract the wall thickness, shrinkage rate and mold temperature of the target food plastic cup at each measuring point during the pressure holding process, and record them as H j , Shr, T, where j = 1, 2, ..., b, j is the number of each measuring point, b is the number of measuring points, and the product evaluation coefficient of each measuring point corresponding to the target food plastic cup during the pressure holding process is analyzed.

[0047] It should be further explained that the specific analysis method of the product evaluation coefficient of the target food plastic cup corresponding to each measuring point during the pressure holding process is: according to the analysis formula Get the product evaluation coefficient of each measuring point corresponding to the target food plastic cup during the pressure holding process Among them, H0, Shr0, T0 are the set wall thickness threshold, plastic cup shrinkage threshold and mold temperature threshold of the target food plastic cup during the pressure holding process, and μ3 is the set minimum value to prevent the denominator from being 0, and its unit is centimeter.

[0048] The designed volume, specific heat capacity and thermal conductivity of the target food plastic cup during the cooling process are extracted and recorded as vol′, c and TC respectively, and the product evaluation coefficient of the target food plastic cup during the cooling process is analyzed.

[0049] It should be further explained that the specific analysis method of the product evaluation coefficient of the target food plastic cup during the cooling process is: according to the analysis formula The product evaluation coefficient Pro3 of the target food plastic cup in the cooling process is obtained, where c0 and TC0 are the specific heat capacity threshold and thermal conductivity threshold of the target food plastic cup in the cooling process, respectively, and μ4 is the minimum value set to prevent the denominator from being 0, and its unit is joule per kilogram Celsius.

[0050] The curing degree cure of the target food plastic cup during the demolding process is extracted, and the product evaluation coefficient of the target food plastic cup during the demolding process is analyzed.

[0051] It should be further explained that the specific analysis method of the product evaluation coefficient of the target food plastic cup in the demoulding process is: according to the analysis formula The product evaluation coefficient Pro4 of the target food plastic cup in the demolding process is obtained, wherein cure0 is the set plastic cup curing degree threshold of the target food plastic cup in the demolding process.

[0052] As a preferred feasibility example, the specific method of obtaining the reference process parameters of the target food plastic cup in each processing process is: matching the raw material evaluation coefficient of the target food plastic cup in the plasticization process with the reference process parameters corresponding to each raw material evaluation coefficient in the plasticization process stored in the information database, and obtaining the reference process parameters corresponding to the raw material evaluation coefficient of the target food plastic cup in the plasticization process, and recording it as the reference process parameters of the target food plastic cup in the plasticization process. Similarly, the reference process parameters of the target food plastic cup in the injection process, pressure holding process, cooling process and demolding process can be obtained.

[0053] They are further collectively referred to as reference process parameters of the target food plastic cup in each processing process.

[0054] The present invention obtains basic product information of the target food plastic cup in each processing process, and then obtains reference process parameters of the target food plastic cup in each processing process, ensuring that each processing flow is carried out according to the optimized parameters, thereby improving production efficiency and product quality.

[0055] The actual process parameter detection module is used to perform real-time detection on the target food plastic cup in each processing process to obtain the actual process parameters of the target food plastic cup in each processing process.

[0056] It should be further explained that the specific method for obtaining the actual process parameters of the target food plastic cup in each processing process is: (1) The specific method for obtaining the temperature and screw speed of the target food plastic cup in the plasticizing process is: using the deployed temperature sensor to directly measure the temperature of the target food plastic cup in the plasticizing process.

[0057] The screw speed of the target food plastic cup during the plasticizing process is directly measured using the deployed rotary encoder.

[0058] (2) The specific method for obtaining the injection pressure and injection speed of the target food plastic cup during the injection process is: using the deployed pressure sensor and speed sensor to directly measure the injection pressure and injection speed of the target food plastic cup during the injection process.

[0059] (3) The specific method for obtaining the holding pressure, holding time and amount of plastic melt added of the target food plastic cup during the holding process is: using the deployed pressure sensor and melt flow meter to directly measure the holding pressure and amount of plastic melt added of the target food plastic cup during the holding process.

[0060] Record the start time and end time of the target food plastic cup in the pressure holding process, and then subtract the end time from the start time to obtain the interval between the end time and the start time of the target food plastic cup in the pressure holding process, and record it as the pressure holding time of the target food plastic cup in the pressure holding process.

[0061] (4) The specific method for obtaining the cooling time of the target food plastic cup during the cooling process, as well as the cooling medium temperature and cooling medium speed is as follows: record the start time point and the end time point of the cooling process of the target food plastic cup, and then subtract the end time point from the start time point to obtain the interval between the end time point and the start time point of the cooling process of the target food plastic cup, and record it as the cooling time of the target food plastic cup during the cooling process.

[0062] The cooling medium temperature and cooling medium speed of the target food plastic cup during the cooling process are directly measured using the arranged temperature sensors and speed sensors.

[0063] (5) The specific method for obtaining the mold opening speed, mold opening angle and mold opening method of the target food plastic cup during the demolding process is: directly measuring the mold opening speed and mold opening angle of the target food plastic cup during the demolding process based on the deployed speed sensor and angle sensor.

[0064] The mold opening process is filmed using high-definition cameras, and professionals then summarize the mold opening method of the target food plastic cup during the demolding process.

[0065] The process parameter matching analysis module is used to analyze the process parameter matching of the target food plastic cup in each processing process.

[0066] As a preferred feasibility example, the specific analysis method of the matching degree of the process parameters of the target food plastic cup in the plasticizing process and the injection process includes: extracting the temperature and screw speed of the target food plastic cup in the plasticizing process, respectively denoted as ST and SV, and analyzing the matching degree of the process parameters of the target food plastic cup in the plasticizing process Among them, ST0 and SV0 are the reference temperature and reference screw speed of the target food plastic cup during the plasticizing process, respectively, and ΔST0 and ΔSV0 are the allowable difference between the set temperature and the reference temperature and the allowable difference between the screw speed and the reference screw speed, respectively.

[0067] It should be further explained that the allowable difference between the temperature and the reference temperature and the allowable difference between the screw speed and the reference screw speed can be set to 0.01 degrees Celsius and 0.01 meters per second, respectively, which means that a deviation of one percent is allowed between the temperature and the reference temperature and between the screw speed and the reference screw speed. The allowable differences between the actual process parameters of the target food plastic cup in the injection process, pressure holding process, cooling process and demolding process and their reference process parameters are similar and will not be repeated.

[0068] The injection pressure and injection speed of the target food plastic cup during the injection process are extracted. Similarly, the matching degree of the process parameters of the target food plastic cup during the injection process can be obtained.

[0069] It should be further explained that the specific analysis method of the matching degree of the process parameters of the target food plastic cup during the injection process is as follows: according to the analysis formula The process parameter matching degree Match2 of the target food plastic cup in the injection process is obtained, where ZF and ZV are the injection pressure and injection speed of the target food plastic cup in the injection process, respectively, ZF0 and ZV0 are the reference injection pressure and reference injection speed of the target food plastic cup in the injection process, respectively, ΔZF0 and ΔZV0 are the allowable difference between the set injection pressure and the reference injection pressure and the allowable difference between the injection speed and the reference injection speed, respectively.

[0070] As a preferred feasibility example, the specific analysis method of the matching degree of the process parameters of the target food plastic cup during the pressure holding process and cooling includes: extracting the pressure holding pressure, pressure holding time and plastic solution addition amount of the target food plastic cup during the pressure holding process, which are recorded as BF, Bt and BM respectively, and analyzing the matching degree of the process parameters of the target food plastic cup during the pressure holding process. Among them, BF0, Bt0, and BM0 are the reference holding pressure, reference holding time, and reference plastic solution addition amount of the target food plastic cup in the holding process, respectively; ΔBF0, ΔBt0, and ΔBM0 are the allowable difference between the set holding pressure and the reference holding pressure, the allowable difference between the holding time and the reference holding time, and the allowable difference between the plastic solution addition amount and the reference plastic solution addition amount, respectively.

[0071] The cooling time, cooling medium temperature and cooling medium speed of the target food plastic cup in the cooling process are extracted. Similarly, the matching degree of process parameters of the target food plastic cup in the cooling process can be obtained.

[0072] It should be further explained that the specific analysis method of the process parameter matching degree of the target food plastic cup in the cooling process is: according to the analysis formula The process parameter matching degree Match4 of the target food plastic cup in the cooling process is obtained, where Lt, LT, and LV are the cooling time, cooling medium temperature, and cooling medium speed of the target food plastic cup in the cooling process, respectively; Lt0, LT0, and LV0 are the reference cooling time, reference cooling medium temperature, and reference cooling medium speed of the target food plastic cup in the cooling process, respectively; ΔLt0, ΔLT0, and ΔLV0 are the allowable difference between the set cooling time and the reference cooling time, the allowable difference between the cooling medium temperature and the reference cooling medium temperature, and the allowable difference between the cooling medium speed and the reference cooling medium speed, respectively.

[0073] As a preferred feasibility example, the specific analysis method of the process parameter matching degree of the target food plastic cup in the demolding process includes: extracting the mold opening speed and mold opening angle of the target food plastic cup in the demolding process, respectively denoted as KV and θ, extracting the mold opening method of the target food plastic cup in the demolding process, determining the mold opening method consistency index con of the target food plastic cup in the demolding process, and analyzing the process parameter matching degree of the target food plastic cup in the demolding process. Where KV0 and θ0 are the reference mold opening speed and reference mold opening angle of the target food plastic cup during the demolding process, respectively; ΔKV0 and Δθ0 are the allowable difference between the set mold opening speed and the reference mold opening speed, and the allowable difference between the mold opening angle and the reference mold opening angle, respectively.

[0074] It needs to be further explained that the specific method of determining the consistency index of the mold opening method of the target food plastic cup in the demolding process is: comparing the mold opening method of the target food plastic cup in the demolding process with its reference mold opening method; if the mold opening method of the target food plastic cup in the demolding process is consistent with its reference mold opening method, then the consistency index of the mold opening method of the target food plastic cup in the demolding process is recorded as 1; otherwise, the consistency index of the mold opening method of the target food plastic cup in the demolding process is recorded as 0.

[0075] The present invention obtains the actual process parameters of the target food plastic cup in each processing process, analyzes the matching degree of the process parameters of the target food plastic cup in each processing process, and compares the actual process parameters with the reference process parameters. This helps to accurately control the production process of the target food plastic cup, and is conducive to timely discovering abnormal situations in the processing process and taking measures to correct them, so as to avoid quality problems in the processing process and ensure the consistency and stability of the product.

[0076] The control demand judgment module is used to judge the process parameter control demand of the target food plastic cup in each processing process. If it is a control demand, the control terminal is executed; if it is not a control demand, the reference process parameter acquisition module is executed.

[0077] As a preferred feasibility example, the specific judgment method of the process parameter control demand of the target food plastic cup in each processing process includes: comparing the process parameter matching degree of the target food plastic cup in each processing process with the set process parameter matching degree threshold of the corresponding processing process; if the process parameter matching degree of the target food plastic cup in a certain processing process is greater than or equal to the process parameter matching degree threshold of the corresponding processing process, then the process parameter control demand of the target food plastic cup in the processing process is recorded as the demand that needs to be controlled; otherwise, the process parameter control demand of the target food plastic cup in each processing process is recorded as the demand that does not need to be controlled, thereby obtaining the process parameter control demand of the target food plastic cup in each processing process.

[0078] The control terminal is used to control the process parameters of the target food plastic cup in each processing process.

[0079] As a preferred feasibility example, the specific operation of controlling the process parameters of the target food plastic cup during the plasticization process includes: determining the specific demand control process parameters of the target food plastic cup in each processing process, and then adjusting them.

[0080] It needs to be further explained that the specific method for determining the specific required control process parameters of the target food plastic cup in each processing process is: extract the temperature and screw speed of the target food plastic cup in the plasticizing process, and compare them with the reference temperature and reference screw speed of the target food plastic cup in the plasticizing process respectively; if the temperature is inconsistent with the reference temperature, the specific required control process parameters of the target food plastic cup in the plasticizing process are recorded as the temperature; if the screw speed is inconsistent with the reference screw speed, the specific required control process parameters of the target food plastic cup in the plasticizing process are recorded as the screw speed; if the temperature and screw speed are inconsistent with the reference temperature and the reference screw speed, the specific required control process parameters of the target food plastic cup in the plasticizing process are recorded as the temperature and the screw speed.

[0081] Then, the injection pressure and injection speed of the target food plastic cup in the injection process are extracted, the holding pressure, holding time and plastic solution addition amount of the target food plastic cup in the holding process are extracted, the cooling time, cooling medium temperature and cooling medium speed of the target food plastic cup in the cooling process are extracted, and the mold opening speed, mold opening angle and mold opening method of the target food plastic cup in the demolding process are extracted. Similarly, the specific required control process parameters of the target food plastic cup in the injection process, holding pressure process, cooling process and demolding process can be obtained.

[0082] It should be further explained that the specific operations for adjusting the process parameters of the target food plastic cup according to the specific requirements of each processing process are as follows: (1) the operation for adjusting the temperature and screw speed of the target food plastic cup during the plasticizing process is as follows: if the temperature is lower than the reference temperature, the temperature is increased by the temperature control system of the injection molding machine; if the temperature is higher than the reference temperature, the temperature is decreased by the temperature control system of the injection molding machine; if the screw speed is lower than the reference screw speed, the screw speed is increased by the speed control button on the operation panel; if the screw speed is higher than the reference screw speed, the screw speed is decreased by the speed control button on the operation panel.

[0083] (2) The operation for adjusting the injection pressure and injection speed of the target food plastic cup during the injection process is as follows: if the injection pressure is less than the reference injection pressure, the injection pressure is increased through the injection molding machine pressure setting interface; if the injection pressure is greater than the reference injection pressure, the injection pressure is decreased through the injection molding machine pressure setting interface; if the injection speed is less than the reference injection speed, the injection speed is increased through the injection molding machine speed adjustment knob; if the injection speed is greater than the reference injection speed, the injection speed is decreased through the injection molding machine speed adjustment knob.

[0084] (3) The operation of adjusting the holding pressure, holding time and amount of plastic solution added during the holding process of the target food plastic cup is as follows: if the holding pressure is less than the reference holding pressure, the holding pressure is increased through the injection molding machine holding pressure setting column; if the holding pressure is greater than the reference holding pressure, the holding pressure is decreased through the injection molding machine holding pressure setting column; if the holding time is less than the reference holding time, the holding time is extended through the injection molding machine holding pressure setting column; if the holding time is greater than the reference holding time, the holding time is shortened through the injection molding machine holding pressure setting column; if the amount of plastic solution added is less than the reference plastic solution added, the holding pressure is fine-tuned through the injection molding machine holding pressure setting column to increase the amount of plastic solution added; if the amount of plastic solution added is greater than the reference plastic solution added, the holding pressure is fine-tuned through the injection molding machine holding pressure setting column to reduce the amount of plastic solution added.

[0085] (4) The operations for adjusting the cooling time, cooling medium temperature and cooling medium speed of the target food plastic cup during the cooling process are as follows: if the cooling time is less than the reference cooling time, the cooling time is extended through the cooling setting bar of the injection molding machine; if the cooling time is greater than the reference cooling time, the cooling time is shortened through the cooling setting bar of the injection molding machine; if the cooling medium temperature is less than the reference cooling medium temperature, the cooling medium temperature is increased by adjusting the temperature control device of the cooling circulating water system; if the cooling medium temperature is greater than the reference cooling medium temperature, the cooling medium temperature is reduced by adjusting the temperature control device of the cooling circulating water system; if the cooling medium speed is less than the reference cold cooling medium speed, the cooling medium speed is increased through a valve; if the cooling medium speed is greater than the reference cold cooling medium speed, the cooling medium speed is reduced through a valve.

[0086] (5) The operations for adjusting the mold opening speed, mold opening angle and mold opening mode of the target food plastic cup during the demolding process are as follows: if the mold opening speed is less than the reference mold opening speed, the mold opening speed is increased through the mold opening speed setting of the injection molding machine; if the mold opening speed is greater than the reference mold opening speed, the mold opening speed is increased through the mold opening speed setting of the injection molding machine; if the mold opening angle is less than the reference mold opening angle, the angle of the mold opening and closing mechanism is increased; if the mold opening angle is greater than the reference mold opening angle, the angle of the mold opening and closing mechanism is decreased; if the mold opening mode is inconsistent with the reference mold opening mode, the mold opening mode is adjusted on the operation panel of the injection molding machine.

[0087] The information database is used to store the plastic melt fluidity corresponding to each plastic melt viscosity, store the standard plastic melt fluidity and reference plastic cup design volume of the target food plastic cup during the injection molding process, store the reference process parameters corresponding to each raw material evaluation coefficient in the plasticization process, the reference process parameters corresponding to each product evaluation coefficient in the injection process, cooling process and demolding process, and the reference process parameters corresponding to each product evaluation coefficient at each measuring point in the early pressure holding process.

[0088] The present invention determines the process parameter control requirements of the target food plastic cup in each processing process and controls the process parameters thereof, thereby helping to quickly respond to abnormal changes in the processing process and adjust the process parameters in time, thereby ensuring the continuity and stability of the production process, helping to reduce the generation of defective and waste products, and avoiding unnecessary energy consumption and material waste.

[0089] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. An intelligent control system for injection molding of food plastic cups, characterized by: include: A reference process parameter acquisition module is used to record the monitored target type of food plastic cup as the target food plastic cup, record the basic information of the target food plastic cup corresponding to the product obtained in each injection molding process as the product basic information of the target food plastic cup in each process, and obtain the reference process parameters of the target food plastic cup in each process, wherein each process includes a plasticizing process, an injection process, a pressure holding process, a cooling process and a demolding process; The actual process parameter detection module is used to perform real-time detection on the target food plastic cup in each processing process and obtain the actual process parameters of the target food plastic cup in each processing process; Process parameter matching analysis module, used to analyze the matching degree of process parameters of target food plastic cups in each processing process; The control demand judgment module is used to judge the process parameter control demand of the target food plastic cup in each processing process. If it is a control demand, the control terminal is executed; if it is not a control demand, the reference process parameter acquisition module is executed; A control terminal is used to control the process parameters of the target food plastic cup in each processing process; The information base is used to store the plastic melt fluidity corresponding to each plastic melt viscosity, store the standard plastic melt fluidity and reference plastic cup design volume of the target food plastic cup in the injection molding process, store the reference process parameters corresponding to each raw material evaluation coefficient in the plasticizing process, the reference process parameters corresponding to each product evaluation coefficient in the injection process, cooling process and demolding process, and the reference process parameters corresponding to each product evaluation coefficient at each measuring point in the early pressure holding process.

2. According to claim 1, a smart control system for injection molding of food plastic cups, characterized in that: The basic information of the product in the plasticizing process includes the raw material type, raw material purity and raw material water content; the basic information of the product in the injection process includes the plastic melt fluidity and the plastic cup design volume; the basic information of the product in the pressure holding process includes the wall thickness of each measuring point of the plastic cup, the plastic cup shrinkage rate and the mold temperature; the basic information of the product in the cooling process includes the plastic cup design volume, specific heat capacity and thermal conductivity; the basic information of the product in the demoulding process includes the degree of solidification of the plastic cup; The process parameters in the plasticizing process include temperature and screw speed, the process parameters in the injection process include injection pressure and injection speed, the process parameters in the holding process include holding pressure, holding time and plastic solution addition amount, the process parameters in the cooling process include cooling time, cooling medium temperature and cooling medium speed, and the process parameters in the demolding process include mold opening speed, mold opening angle and mold opening method.

3. The intelligent control system for injection molding of food plastic cups according to claim 2, characterized in that: In the process of obtaining the reference process parameters of the target food plastic cup in each processing process, it is necessary to construct the raw material evaluation coefficient of the target food plastic cup in the plasticizing process, and the specific analysis method is as follows: Extract the raw material type of the target food plastic cup in the plasticization process, match it with the raw material evaluation coefficient influence index corresponding to each raw material type stored in the information database, and obtain the raw material evaluation coefficient influence index imp corresponding to the raw material type of the target food plastic cup in the plasticization process; Extract the raw material purity and raw material water content of the target food plastic cup during the plasticization process, which are recorded as pur and wc respectively; Analyze the raw material evaluation coefficient of the target food plastic cup during the plasticization process Where pur0 and wc0 are the raw material purity threshold and raw material moisture content threshold of the target food plastic cup in the plasticizing process, respectively; μ1 is the minimum value set to prevent the denominator from being 0, and its unit is percentage.

4. The intelligent control system for injection molding of food plastic cups according to claim 3, characterized in that: In the process of obtaining the reference process parameters of the target food plastic cup in each processing process, it is necessary to construct the raw material evaluation coefficient of the target food plastic cup in the injection process, the pressure holding process, the cooling process and the demoulding process. The specific analysis method is as follows: Extract the plastic melt fluidity and plastic cup design volume of the target food plastic cup during the injection process, record them as flu and vol respectively, and analyze the product evaluation coefficient of the target food plastic cup during the injection process; Extract the wall thickness, shrinkage rate and mold temperature of the target food plastic cup at each measuring point during the pressure holding process, and record them as H j , Shr, T, where j = 1, 2, ..., b, j is the number of each measuring point, b is the number of measuring points, and the product evaluation coefficient of each measuring point corresponding to the target food plastic cup during the pressure holding process is analyzed; Extract the design volume, specific heat capacity and thermal conductivity of the target food plastic cup during the cooling process, record them as vol′, c, TC respectively, and analyze the product evaluation coefficient of the target food plastic cup during the cooling process; The curing degree cure of the target food plastic cup during the demolding process is extracted, and the product evaluation coefficient of the target food plastic cup during the demolding process is analyzed.

5. The intelligent control system for injection molding of food plastic cups according to claim 4, characterized in that: The specific method for obtaining the reference process parameters of the target food plastic cup in each processing process is as follows: The raw material evaluation coefficient of the target food plastic cup in the plasticizing process is matched with the reference process parameters corresponding to the raw material evaluation coefficients in the plasticizing process stored in the information database to obtain the reference process parameters corresponding to the raw material evaluation coefficients in the plasticizing process of the target food plastic cup, which are recorded as the reference process parameters of the target food plastic cup in the plasticizing process. Similarly, the reference process parameters of the target food plastic cup in the injection process, the pressure holding process, the cooling process and the demoulding process can be obtained; They are further collectively referred to as reference process parameters of the target food plastic cup in each processing process.

6. The intelligent control system for injection molding of food plastic cups according to claim 2, characterized in that: The specific analysis method of the matching degree of process parameters of the target food plastic cup in the plasticizing process and the injection process includes: Extract the temperature and screw speed of the target food plastic cup during the plasticizing process, record them as ST and SV respectively, and analyze the matching degree of process parameters of the target food plastic cup during the plasticizing process Among them, ST0 and SV0 are the reference temperature and reference screw speed of the target food plastic cup in the plasticizing process, respectively, and ΔST0 and ΔSV0 are the allowable difference between the set temperature and the reference temperature and the allowable difference between the screw speed and the reference screw speed, respectively; The injection pressure and injection speed of the target food plastic cup during the injection process are extracted. Similarly, the matching degree of the process parameters of the target food plastic cup during the injection process can be obtained.

7. The intelligent control system for injection molding of food plastic cups according to claim 6, characterized in that: The specific analysis method of the matching degree of the process parameters of the target food plastic cup during the pressure holding process and the cooling process includes: Extract the holding pressure, holding time and amount of plastic solution added in the holding process of the target food plastic cup, record them as BF, Bt and BM respectively, and analyze the matching degree of process parameters of the target food plastic cup in the holding process Among them, BF0, Bt0, and BM0 are the reference holding pressure, reference holding time, and reference plastic solution addition amount of the target food plastic cup in the holding process, respectively; ΔBF0, ΔBt0, and ΔBM0 are the allowable difference between the set holding pressure and the reference holding pressure, the allowable difference between the holding time and the reference holding time, and the allowable difference between the plastic solution addition amount and the reference plastic solution addition amount, respectively; The cooling time, cooling medium temperature and cooling medium speed of the target food plastic cup in the cooling process are extracted. Similarly, the matching degree of process parameters of the target food plastic cup in the cooling process can be obtained.

8. The intelligent control system for plastic food cup injection molding according to claim 7, characterized in that: The specific analysis method of the matching degree of the process parameters of the target food plastic cup in the demoulding process includes: Extract the mold opening speed and mold opening angle of the target food plastic cup during the demolding process, record them as KV and θ respectively, extract the mold opening method of the target food plastic cup during the demolding process, determine the mold opening method consistency index con of the target food plastic cup during the demolding process, and analyze the matching degree of process parameters of the target food plastic cup during the demolding process Where KV0 and θ0 are the reference mold opening speed and reference mold opening angle of the target food plastic cup during the demolding process, respectively; ΔKV0 and Δθ0 are the allowable difference between the set mold opening speed and the reference mold opening speed, and the allowable difference between the mold opening angle and the reference mold opening angle, respectively.

9. The intelligent control system for injection molding of food plastic cups according to claim 8, characterized in that: The specific determination method of the process parameter control requirements of the target food plastic cup in each processing process includes: The process parameter matching degree of the target food plastic cup in each processing process is compared with the set process parameter matching degree threshold of the corresponding processing process. If the process parameter matching degree of the target food plastic cup in a certain processing process is greater than or equal to the process parameter matching degree threshold of the corresponding processing process, the process parameter control demand of the target food plastic cup in the processing process is recorded as the demand that needs to be controlled; otherwise, the process parameter control demand of the target food plastic cup in each processing process is recorded as the demand that does not need to be controlled, thereby obtaining the process parameter control demand of the target food plastic cup in each processing process.

10. The intelligent control system for injection molding of food plastic cups according to claim 1, characterized in that: The specific operation of controlling the process parameters of the target food plastic cup during the plasticization process includes: determining the specific demand control process parameters of the target food plastic cup during each processing process, and then adjusting them.

Images