Polyvinyl chloride compounding control method, device and compounding equipment

Abstract

The application provides a polyvinyl chloride mixing control method and device and a mixing equipment. The method comprises the following steps: when a discharging signal is received, a mixing motor is controlled to operate to stir the material in a first container, and a first mixing time of the mixing motor is recorded, the material comprising polyvinyl chloride and auxiliary materials; based on a preset target type of polyvinyl chloride mixing, a process control strategy corresponding to the target type is obtained as a target process control strategy, the target process control strategy comprising a shortest mixing time; based on the first mixing time and the target process control strategy, the mixing motor is controlled to stir and mix the material in the first container, wherein the stirring and mixing time exceeds the shortest mixing time. In this way, different process control strategies can be automatically selected for different PVC mixtures, manual control by professional operators is not required, the quality of the PVC mixture is improved, and the problem of the quality of the PVC mixture being affected by human factors is improved.

Description

Technical Field

[0001] This invention relates to the field of manufacturing process control technology, and more specifically, to a method, apparatus, and mixing equipment for controlling polyvinyl chloride (PVC) mixing. Background Technology

[0002] Polyvinyl chloride (PVC) is a high-viscosity, heat-sensitive thermoplastic polymer. Its processing performance is highly sensitive to parameters such as processing temperature. Whether PVC product quality meets production and user requirements and standards depends not only on the PVC product formulation, raw materials, and equipment performance, but also on the control of the production process. As one of the main raw materials for wires and cables, the mixing process of PVC raw materials is the first step in PVC granulation, and its control directly affects the subsequent granulation process and product quality. Currently, temperature control is commonly used to study the impact of mixing temperature and time on product quality. However, this method ignores the fact that the material state changes over time during mixing, which can easily lead to substandard mixing. Furthermore, different types of PVC have different mixing processes. When mixing different types of PVC, current methods usually involve manual control of equipment to modify the process, requiring high levels of operator experience and being susceptible to human error affecting the quality of the PVC mixture. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a polyvinyl chloride (PVC) mixing control method, apparatus and mixing equipment, which can automatically select the corresponding process control strategy for different PVC mixtures, without the need for manual control by professional operators, and can improve the problem of PVC mixing quality affected by human factors.

[0004] To achieve the above technical objectives, the technical solution adopted in this application is as follows:

[0005] In a first aspect, embodiments of this application provide a polyvinyl chloride (PVC) mixing control method, applied to a mixing equipment. The mixing equipment includes a mixing motor and a first container. The mixing motor is used to stir and mix the materials in the first container. The method includes:

[0006] Upon receiving a discharge signal, the mixing motor is controlled to run to stir the material in the first container, and the first mixing time of the mixing motor is recorded. The material includes polyvinyl chloride and auxiliary materials.

[0007] Based on the preset target type of polyvinyl chloride mixture, the process control strategy corresponding to the target type is obtained as the target process control strategy, and the target process control strategy includes the shortest mixing time.

[0008] Based on the first mixing time and the target process control strategy, the mixing motor is controlled to stir and mix the materials in the first container, wherein the stirring and mixing time exceeds the minimum mixing time.

[0009] In conjunction with the first aspect, in some optional embodiments, the target process control strategy includes preset specified maximum current values ​​and discharge current values ​​of the mixing motor. Based on the first mixing time and the target process control strategy, the mixing motor is controlled to stir and mix the materials in the first container, including:

[0010] The mixing motor is controlled to run continuously, and when the first mixing time reaches the shortest mixing time, the current value of the mixing motor is acquired at a specified frequency as the first current value.

[0011] Determine whether the first current value is greater than the specified maximum current value;

[0012] After the first current value is greater than the specified maximum current value, the current second current value of the mixing motor is obtained;

[0013] When the second current value is less than the discharge current value, a prompt message is generated for adding chlorinated polyethylene to the first container;

[0014] After a first specified time period following the generation of the prompt message, the electrically controlled valve in the first container is opened to discharge the mixed material from the first container.

[0015] In conjunction with the first aspect, in some optional embodiments, the target process control strategy further includes specifying a current difference, and controlling the mixing motor to stir and mix the materials in the first container based on the first mixing time and the target process control strategy, including:

[0016] The mixing motor is controlled to run continuously, and when the first mixing time reaches the shortest mixing time, multiple current values ​​of the mixing motor are acquired at a specified frequency, and the multiple current values ​​are arranged in a time sequence.

[0017] When there is a peak current among the plurality of current values, and after the peak current there is a current value whose difference from the peak current is greater than the specified current difference, it is determined that the mixing motor has passed the maximum current in the current mixing cycle, and the peak current is the maximum current in the current mixing cycle.

[0018] The discharge current value is determined based on the peak current, wherein the ratio of the discharge current value to the peak current is a specified ratio.

[0019] After the mixing motor has passed the maximum current in the current mixing cycle, the current second current value of the mixing motor is obtained;

[0020] When the second current value is less than the discharge current value, a prompt message is generated for adding chlorinated polyethylene to the first container;

[0021] After a first specified time period following the generation of the prompt message, the electrically controlled valve in the first container is opened to discharge the mixed material from the first container.

[0022] In conjunction with the first aspect, in some optional embodiments, the target process control strategy further includes a maximum mixing time, and the method further includes:

[0023] When the first mixing time reaches the longest mixing time, and the electronically controlled valve of the first container remains closed during the first mixing time, the electronically controlled valve is controlled to open to discharge the mixed material from the first container.

[0024] In conjunction with the first aspect, in some optional embodiments, the target process control strategy further includes a preset idling current, and the method further includes:

[0025] After a second specified time period following the opening of the electrically controlled valve, the electrically controlled valve is controlled to close.

[0026] Alternatively, after the second specified time following the opening of the solenoid valve, and when the current current value of the mixing motor is less than or equal to the preset idling current, the solenoid valve is controlled to close.

[0027] In conjunction with the first aspect, in some alternative implementations, the method further includes:

[0028] When the electrically controlled valve is closed, the mixing equipment is reset.

[0029] In conjunction with the first aspect, in some alternative embodiments, before receiving the discharge signal, the method further includes:

[0030] Based on the current curves of the mixing motor in each PVC mixing cycle, the shortest mixing time, the longest mixing time, and the time point at which the prompt message for adding chlorinated polyethylene is issued in the mixing cycle, a process control strategy corresponding to each PVC mixing is obtained.

[0031] In conjunction with the first aspect, in some alternative embodiments, the mixing apparatus further includes a second container, and after generating a prompt message for adding chlorinated polyethylene to the first container, the method further includes:

[0032] Control the second container, which is pre-filled with chlorinated polyethylene, to add chlorinated polyethylene to the first container.

[0033] Secondly, this application also provides a polyvinyl chloride mixing control device, applied to a mixing equipment, the mixing equipment including a mixing motor and a first container, the mixing motor being used to stir and mix the materials in the first container, the device comprising:

[0034] The first control unit is used to control the mixing motor to run to stir the material in the first container when a discharge signal is received, and to record the first mixing time of the mixing motor. The material includes polyvinyl chloride and auxiliary materials.

[0035] The acquisition unit is used to acquire a process control strategy corresponding to a preset target type of polyvinyl chloride mixture as a target process control strategy, wherein the target process control strategy includes the shortest mixing time.

[0036] The second control unit is used to control the mixing motor to stir and mix the material in the first container based on the first mixing time and the target process control strategy, wherein the stirring and mixing time exceeds the minimum mixing time.

[0037] Thirdly, embodiments of this application also provide a mixing device, which includes a mixing motor, a first container, a processor, and a memory. The memory stores a computer program, and when the computer program is executed by the processor, the mixing device performs the above-described method.

[0038] The invention employing the above technical solution has the following advantages:

[0039] In the technical solution provided in this application, a process control strategy corresponding to a preset target type of PVC mixture can be automatically obtained as the target process control strategy. Then, based on the first mixing time and the target process control strategy, the mixing motor is controlled to stir and mix the material in the first container. The stirring and mixing time exceeds the minimum mixing time. In this way, the corresponding process control strategy can be automatically selected for different PVC mixtures without the need for manual control by professional operators. This is beneficial to improving the quality of PVC mixtures and can alleviate the problem of PVC mixture quality being affected by human factors. Attached Figure Description

[0040] This application can be further illustrated by the non-limiting embodiments given in the accompanying drawings. It should be understood that the following drawings only illustrate some embodiments of this application and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained from these drawings without any inventive effort.

[0041] Figure 1 A block diagram of a mixing device provided in an embodiment of this application.

[0042] Figure 2 This is a schematic flowchart of the polyvinyl chloride mixing control method provided in the embodiments of this application.

[0043] Figure 3 The current waveform of the mixing motor during the mixing process is shown in the embodiment of this application.

[0044] Figure 4 A block diagram of a polyvinyl chloride mixing control device provided in an embodiment of this application.

[0045] Icons: 10-Mixing equipment; 11-Processing module; 12-Storage module; 13-Mixing motor; 300-PVC mixing control device; 310-First control unit; 320-Acquisition unit; 330-Second control unit. Detailed Implementation

[0046] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that similar or identical parts are referred to by the same reference numerals in the drawings or description. Implementations not shown or described in the drawings are forms known to those skilled in the art. In the description of this application, terms such as "first" and "second" are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0047] Please refer to Figure 1 This application provides a mixing device 10, which may include a mixing motor 13, a first container, a processing module 11, and a storage module 12. The mixing motor 13 is used to stir and mix the materials in the first container. The storage module 12 stores a computer program. When the computer program is executed by the processing module 11, the mixing device 10 can perform the corresponding steps in the following polyvinyl chloride mixing control method.

[0048] Understandably, the mixing motor 13 has its shaft connected to a stirring shaft or other mechanism for stirring. The stirring shaft is located in the first container, and when the mixing motor 13 is running, it can drive the stirring shaft to rotate, thereby stirring the material in the first container.

[0049] In this embodiment, the mixing motor 13 may further include a second container for containing chlorinated polyethylene (CPE) so as to add CPE to the material in the first container for mixing.

[0050] Please refer to Figure 2This application also provides a method for controlling the mixing of polyvinyl chloride (PVC), which can be applied to the aforementioned mixing equipment 10. The method for controlling the mixing of PVC may include the following steps:

[0051] Step 110: Upon receiving the discharge signal, control the mixing motor 13 to run to stir the material in the first container, and record the first mixing time of the mixing motor 13. The material includes polyvinyl chloride and auxiliary materials.

[0052] Step 120: Based on the preset target type of polyvinyl chloride mixture, obtain the process control strategy corresponding to the target type as the target process control strategy, the target process control strategy including the shortest mixing time;

[0053] Step 130: Based on the first mixing time and the target process control strategy, control the mixing motor 13 to stir and mix the materials in the first container, wherein the stirring and mixing time exceeds the minimum mixing time.

[0054] The following is a detailed explanation of each step in the polyvinyl chloride (PVC) mixing control method:

[0055] In step 110, the discharge signal can be flexibly generated according to actual conditions. For example, firstly, the weighing scale weighs the PVC and auxiliary materials to be mixed. When the weight of the PVC and auxiliary materials meets the set weight, the PVC and auxiliary materials are placed into the first container, and a discharge signal is generated simultaneously. The weighing scale is connected to the processing module 11. When the processing module 11 receives the discharge signal, it can control the mixing motor 13 to run and stir the materials in the first container. Alternatively, the discharge signal can be triggered by the operator pressing the corresponding control button.

[0056] The auxiliary materials may include, but are not limited to, conventional materials such as resin, heavy calcium carbonate, nano-calcium carbonate, and plasticizers. Furthermore, the mass ratios of the various components (e.g., polyvinyl chloride, resin, heavy calcium carbonate, nano-calcium carbonate, and plasticizer) in different types of PVC blends are standard formulations and will not be elaborated here.

[0057] During feeding, materials such as polyvinyl chloride, resin, fillers, additives and plasticizers are added simultaneously and placed into the first container.

[0058] Upon receiving the discharge signal, the processing module 11 can start timing from zero, which means a new mixing cycle has begun. By timing, the mixing time of PVC and auxiliary materials can be recorded in real time as the first mixing time.

[0059] Prior to step 110, the method further includes the step of creating a process control strategy corresponding to each polyvinyl chloride blend. For example, before receiving the discharge signal, the method further includes:

[0060] Based on the current curves of the mixing motor 13 in each mixing cycle of polyvinyl chloride (PVC) mixture, the shortest mixing time, the longest mixing time, and the time point at which the prompt message for adding chlorinated polyethylene is issued in the mixing cycle, a process control strategy corresponding to each PVC mixture is obtained.

[0061] Understandably, during the experimental phase, a large dataset can be collected from the mixing motor 13 during the mixing process. This dataset includes the current curve of each polyvinyl chloride (PVC) compound in one mixing cycle, the shortest mixing time, the longest mixing time, the time point at which a prompt message for adding chlorinated polyethylene (CPE) is issued during the mixing cycle, the current value of the mixing motor 13 during feeding, the current value of the mixing motor 13 during adding CPE, and the current value and time point during discharging. The time point at which the prompt message is issued is a time node relative to the mixing cycle. Then, in the dataset, for each PVC compound, data with high dispersion is removed to filter out invalid or abnormal data. The method for filtering data with high dispersion is conventional and can be flexibly determined according to the actual situation; it will not be elaborated here.

[0062] After data filtering is completed, the average value can be calculated based on the data of each polyvinyl chloride (PVC) blend. This yields information such as the current curve, shortest mixing time, longest mixing time, the time point at which the prompt message for adding chlorinated polyethylene (CPE) is issued during a mixing cycle, the current value of the mixing motor 13 during feeding, the current value of the mixing motor 13 during adding CPE, and the current value and time point during discharging. This information serves as the corresponding process control strategy for each PVC blend. The process control strategy for each PVC blend can be stored in the storage module 12, allowing for the automatic selection of the process control strategy corresponding to the current target type as the target process control strategy during mixing.

[0063] The inventors discovered that the rate at which the state of PVC mixture changes with temperature is related to various factors such as the environment, equipment, and type of raw materials. Therefore, temperature alone cannot control the entire mixing process. During the mixing process, the load on the mixing motor 13 changes, causing the current to fluctuate continuously; it is not constant. No additional material is added during this process, yet the load changes. That is, the change in the material's state causes a change in the material load, meaning that the current changes simultaneously with the material's state. This aligns with the actual situation where physicochemical reactions occur during mixing, causing changes in the material's state. In other words, temperature is independent of the material's state; temperature only reflects the material's temperature. However, changes in current are closely related to changes in the material's state. Different states of the material can be reflected in the current's state and rate of change. Therefore, it can be concluded that the entire mixing process can be controlled based on changes in current. This allows for the creation of process control strategies corresponding to each type of PVC mixture based on the current value of the mixing motor 13.

[0064] Please refer to Figure 3 , Figure 3 The graph shows the waveform of the current value of the mixing motor 13 changing over time. The vertical axis represents the current value of the mixing motor 13, and the horizontal axis represents time, with the time line moving from right to left. Within one mixing cycle (the longest mixing time T2 can be considered a mixing cycle), point A can be considered the starting point for PVC feeding, point B the ending point for PVC feeding, point C the point of the shortest mixing time T1 within a mixing cycle, and point D the point of the maximum peak current within a mixing cycle; point E represents the current value and time point at the start of discharging, and point F the point at the end of discharging. During the PVC mixing process, as the mixing time increases, the resin and plasticizer gradually clump together, increasing the load on the mixing motor 13 and raising the current.

[0065] In step 120, the preset target type of PVC mixture can be information entered by the operator before mixing, based on the type of PVC to be mixed. This can be flexibly determined according to the actual situation. Each type of PVC mixture is associated with a corresponding process control strategy. In this way, the process control strategy corresponding to the target type can be indexed based on the target type and used as the target process control strategy.

[0066] The target process control strategy may include, but is not limited to, the shortest mixing time, the longest mixing time, the time point at which a prompt message for adding chlorinated polyethylene is issued during the mixing cycle, the current value of the mixing motor 13 when adding material, the current value of the mixing motor 13 when adding chlorinated polyethylene, and the current value and time point when discharging material.

[0067] In step 130, the processing module 11 can control each execution module (e.g., mixing motor 13, electric control valve) in the mixing equipment 10 based on the target process control strategy, thereby realizing the mixing control of polyvinyl chloride.

[0068] As an optional implementation, the target process control strategy includes preset maximum current values ​​and discharge current values ​​for the mixing motor 13, and step 130 may include:

[0069] Step 131: Control the mixing motor 13 to run continuously, and when the first mixing time reaches the shortest mixing time, obtain the current value of the mixing motor 13 at a specified frequency as the first current value.

[0070] Step 132: Determine whether the first current value is greater than the specified maximum current value;

[0071] Step 133: After the first current value is greater than the specified maximum current value, obtain the current second current value of the mixing motor 13;

[0072] Step 134: When the second current value is less than the discharge current value, a prompt message is generated for adding chlorinated polyethylene to the first container;

[0073] Step 135: After a first specified time following the generation of the prompt message, control the opening of the electrically controlled valve in the first container to discharge the mixed material in the first container.

[0074] In this embodiment, parameters such as the shortest mixing time, the longest mixing time, the first specified time, the second specified time, the specified frequency, the specified maximum current value, and the discharge current value can all be flexibly set according to the actual situation, and no specific limitation is made here.

[0075] During the mixing process, if the mixing time of the mixing motor 13 reaches the shortest mixing time, the current value of the mixing motor 13 can be periodically acquired as the first current value. In this way, multiple first current values ​​distributed in a time sequence can be obtained.

[0076] The specified maximum current value can be slightly less than the maximum peak current of the entire mixing cycle. If the first current value collected is greater than the specified maximum current value, it indicates that the current value of the mixing motor 13 has reached or is about to reach the maximum peak current of the entire mixing cycle. Thereafter, the current value of the mixing motor 13 will continue to be collected, and the collected current value will be used as the second current value.

[0077] If the current second current value is less than the discharge current value, it indicates that chlorinated polyethylene (CPE) needs to be added to the first container, thus generating a prompt message for adding CPE to the first container.

[0078] After generating a prompt message for adding chlorinated polyethylene to the first container, the method may further include: controlling a second container pre-filled with chlorinated polyethylene to add chlorinated polyethylene to the first container.

[0079] Understandably, the second container can be equipped with an electrically controlled valve, which controls the connectivity between the second and first containers. The electrically controlled valve on the first container can be referred to as the first electrically controlled valve, and the electrically controlled valve on the second container is the second electrically controlled valve. When the second electrically controlled valve is opened, the material in the second container can be added to the first container. In this embodiment, the second container of the mixing device 10 can be pre-filled with a corresponding mass of chlorinated polyethylene material. When a prompt message for adding chlorinated polyethylene is generated, the second electrically controlled valve in the second container can be opened, allowing the chlorinated polyethylene in the second container to enter the first container through the second electrically controlled valve. In this way, the automatic addition of chlorinated polyethylene can be achieved, reducing manual intervention in the process.

[0080] In other embodiments, the mixing device 10 may further include a prompting module such as an indicator light or a horn, which can emit sound or light prompts based on the prompt information. The operator can manually add chlorinated polyethylene to the first container based on the issued prompt information for adding chlorinated polyethylene. The mass of chlorinated polyethylene added to the first container is well known to those skilled in the art and is not limited here.

[0081] It should be noted that CPE is a small component that has a significant impact on the toughness of the mixture. It should be added before the mixture is discharged from the mixing pot. If it is added in advance, the mixing motor 13 will be overloaded and may not be able to withstand the load.

[0082] In this embodiment, after generating the prompt message, it can be assumed that the operation of adding CPE to the first container has been completed and the mixing of CPE and PVC material in the first container has been completed after the first specified time period has elapsed. At this time, the conditions for discharge are met, that is, the electronically controlled valve in the first container is opened to discharge the mixed material in the first container.

[0083] As an optional implementation, the target process control strategy further includes specifying a current difference, and step 130 may include:

[0084] Step 231: Control the mixing motor 13 to run continuously, and when the first mixing time reaches the shortest mixing time, acquire multiple current values ​​of the mixing motor 13 at a specified frequency, wherein the multiple current values ​​are arranged in a time sequence.

[0085] Step 232: When there is a peak current among the plurality of current values, and after the peak current there is a current value whose difference from the peak current is greater than the specified current difference, it is determined that the mixing motor 13 has passed the maximum current in the current mixing cycle, and the peak current is the maximum current in the current mixing cycle.

[0086] Step 233: Determine the discharge current value based on the peak current, wherein the ratio of the discharge current value to the peak current is a specified ratio.

[0087] Step 234: After the mixing motor 13 has passed the maximum current in the current mixing cycle, obtain the current second current value of the mixing motor 13.

[0088] Step 235: When the second current value is less than the discharge current value, a prompt message is generated for adding chlorinated polyethylene to the first container;

[0089] Step 236: After a first specified time following the generation of the prompt message, control the opening of the electrically controlled valve in the first container to discharge the mixed material in the first container.

[0090] During the operation of the mixing motor 13, the current fluctuates, generating false peaks. When capturing the final peak value of the current, it is necessary to accurately identify and filter the false peaks.

[0091] Understandably, compared to steps 131 to 135, in determining whether the mixing motor 13 has passed the maximum current within the current mixing cycle, in steps 231 to 236, as the current of the mixing motor 13 continuously increases, whenever the current is detected to be greater than the previously collected current, the current is used to replace the previous current, and this cycle continues until the current reaches its maximum value. Then, if the currently collected current value is less than the previous current value, it means that the current has begun to decrease. When the current current value decreases to a certain value (i.e., a specified current difference, such as 10 amperes) between it and the maximum current value, it is considered that the current has reached its maximum peak value. In this way, false current peaks can be filtered out, thereby accurately identifying the actual maximum peak current.

[0092] The discharge current can be determined based on the maximum peak current. For example, the ratio of the discharge current to the peak current can be 0.89.

[0093] In this embodiment, the discharge current typically needs to be less than a specific value. For example, the discharge current needs to be less than 83 amperes. If the discharge current is greater than 83 amperes, a new current value less than 83 amperes needs to be determined as the actual discharge current. The method for re-determining the discharge current can be as follows: continue to collect the current value of the mixing motor 13 to obtain multiple current values ​​arranged in a time sequence. When there is a peak current among the multiple current values, and after the peak current, there is a current value whose difference from the peak current is greater than a specified current difference, then the peak current is multiplied by the specified ratio mentioned above to obtain a new discharge current. If the new discharge current is still greater than or equal to the specific value (such as 83 amperes), the previous process will be repeated until the new discharge current is less than the specific value.

[0094] If the discharge current is not lower than a specific value, the material in the first container will be discharged when the mixing time reaches the maximum mixing time. Please refer to [the relevant documentation] again. Figure 3 The range corresponding to CD is the adjustable range of the maximum current S1; the range corresponding to DE is the adjustable range of the discharge current S2. Both the maximum current and the discharge current can be flexibly determined according to the actual situation.

[0095] After the mixing motor 13 has passed its maximum current during the current mixing cycle, it will continue to acquire the current of the mixing motor 13 as a second current value. If the second current value is less than the discharge current value, it means that CPE needs to be added to the first container, and a prompt message will be generated. Then, the mixing device 10 can assume that after generating the prompt message and after a first specified time period, the operation process of adding CPE to the first container has been completed, and the mixing of CPE and PVC material in the first container has been completed. At this time, the discharge conditions are met, that is, the electronically controlled valve in the first container is opened to discharge the mixed material in the first container.

[0096] After PVC, CPE, and other materials are mixed, the material discharged from the first container can be used for PVC granulation. The resulting granules are the target type of PVC granules. Based on the above-mentioned mixing control, the obtained target type of PVC granules usually meet production requirements and can be used as insulation and sheathing materials for cables.

[0097] As an optional implementation, the target process control strategy further includes a maximum mixing time, and the method further includes:

[0098] When the first mixing time reaches the longest mixing time, and the electronically controlled valve of the first container remains closed during the first mixing time, the electronically controlled valve is controlled to open to discharge the mixed material from the first container.

[0099] Understandably, if the mixing equipment 10 malfunctions, the current of the mixing motor 13 will fluctuate significantly, causing the mixing control to fail. In this case, if the mixing time reaches the set maximum mixing duration within a mixing cycle, the material will be discharged unconditionally. That is, if the first mixing duration reaches the maximum mixing duration, and the electrically controlled valve of the first container has not been opened during this period, it indicates that the mixing equipment 10 is malfunctioning. At this time, it is necessary to control the electrically controlled valve of the first container to open, so as to discharge the mixed PVC and auxiliary materials in the first container, and prevent the current control from failing due to mechanical failure of the mixing equipment 10 or sudden changes in raw materials.

[0100] As an optional implementation, the target process control strategy further includes a preset idling current, and the method further includes:

[0101] After a second specified time period following the opening of the electrically controlled valve, the electrically controlled valve is controlled to close.

[0102] Alternatively, after the second specified time following the opening of the solenoid valve, and when the current current value of the mixing motor 13 is less than or equal to the preset idling current, the solenoid valve is controlled to close.

[0103] Understandably, when the electrically controlled valve on the first container opens, it indicates that material in the first container is being discharged. The mixing equipment 10 can default to discharging all material from the first container after a certain period of time following the opening of the electrically controlled valve. That is, after a second specified time period after the valve opens, the electrically controlled valve is closed to prepare for the next mixing operation. The second specified time period can be flexibly set according to actual conditions.

[0104] During the material discharge from the first container, the mixing motor 13 continues to operate. To ensure that the material in the first container is completely discharged, the current value of the mixing motor 13 can be checked again after a second specified time following the opening of the solenoid valve. If the current value of the mixing motor 13 is less than or equal to the preset idling current, it indicates that the mixing motor 13 is in an idling state, meaning that the material in the first container has been completely discharged. At this point, the solenoid valve can be closed to prevent scorching. In this way, automatic material discharge and automatic closure of the first container can be achieved, improving the automation and reliability of the mixing process.

[0105] When setting the "preset idling current," considering the gap between the stirring blades and the inner wall of the mixing pot (first container), a small portion of material may not be completely discharged. Therefore, the "preset idling current" will be increased by any value between 5 and 10 amperes based on the actual idling current. The actual idling current can be flexibly determined according to the actual situation and is used to represent the current value of the mixing motor 13 in the idling state when there is no material in the first mixing container.

[0106] As an optional implementation, the method further includes resetting the mixing equipment 10 when the electrically controlled valve is closed.

[0107] When the electrically controlled valve closes, it indicates that the current mixing control process has ended, and a reset can be performed to prepare for the next mixing control. During the reset process, the current value of the mixing motor 13 and the first mixing duration recorded by the processing module 11 in the previous cycle can be cleared to zero. Understandably, resetting the mixing device 10 allows it to prepare for the next PVC mixing cycle, preventing data collected in the previous mixing cycle from affecting the next mixing control, thereby improving the reliability of each PVC mixing control.

[0108] Based on the above design, the current rises and then falls with the change in material. Both the rise and fall are closely related to the state of the material, resulting in more accurate control and enabling uniform mixing of PVC, auxiliary materials, and other materials. Current control prevents premature material discharge before proper mixing, ensuring that each batch of material is completely discharged after mixing, preventing overloading of the mixer and protecting the motor. Furthermore, current control eliminates the need for manual parameter adjustment, enabling fully automated operation. It also eliminates the need for thermocouples for temperature detection (which are often faulty and inaccurate), ensuring complete discharge of the previous batch and preventing unnecessary wear on the mixing motor 13 due to material accumulation. Additionally, compared to temperature control, the energy consumption of the mixing control method provided in this embodiment can be reduced by 10%.

[0109] Please refer to Figure 4 This application also provides a polyvinyl chloride (PVC) mixing control device 300, which can be applied to the aforementioned mixing equipment 10. The PVC mixing control device 300 includes at least one software function module that can be stored in the storage module 12 as software or firmware or embedded in the operating system (OS). The processing module 11 is used to execute the executable modules stored in the storage module 12, such as the software function modules and computer programs included in the PVC mixing control device 300.

[0110] The polyvinyl chloride mixing control device 300 includes a first control unit 310, an acquisition unit 320, and a second control unit 330. The functions of each unit are as follows:

[0111] The first control unit 310 is used to control the mixing motor 13 to run to stir the material in the first container when a discharge signal is received, and to record the first mixing time of the mixing motor 13. The material includes polyvinyl chloride and auxiliary materials.

[0112] The acquisition unit 320 is used to acquire a process control strategy corresponding to a preset target type of polyvinyl chloride mixture as a target process control strategy, wherein the target process control strategy includes the shortest mixing time.

[0113] The second control unit 330 is used to control the mixing motor 13 to stir and mix the material in the first container based on the first mixing time and the target process control strategy, wherein the stirring and mixing time exceeds the minimum mixing time.

[0114] Optionally, the target process control strategy includes preset maximum current values ​​and discharge current values ​​for the mixing motor 13, and the second control unit 330 can also be used for:

[0115] The mixing motor 13 is controlled to run continuously, and when the first mixing time reaches the shortest mixing time, the current value of the mixing motor 13 is obtained at a specified frequency as the first current value.

[0116] Determine whether the first current value is greater than the specified maximum current value;

[0117] After the first current value is greater than the specified maximum current value, the current second current value of the mixing motor 13 is obtained;

[0118] When the second current value is less than the discharge current value, a prompt message is generated for adding chlorinated polyethylene to the first container;

[0119] After a first specified time period following the generation of the prompt message, the electrically controlled valve in the first container is opened to discharge the mixed material from the first container.

[0120] Optionally, the target process control strategy also includes specifying a current difference, and the second control unit 330 can also be used for:

[0121] The mixing motor 13 is controlled to run continuously, and when the first mixing time reaches the shortest mixing time, multiple current values ​​of the mixing motor 13 are acquired at a specified frequency, and the multiple current values ​​are arranged in a time sequence.

[0122] When there is a peak current among the plurality of current values, and after the peak current there is a current value whose difference from the peak current is greater than the specified current difference, it is determined that the mixing motor 13 has passed the maximum current in the current mixing cycle, and the peak current is the maximum current in the current mixing cycle.

[0123] The discharge current value is determined based on the peak current, wherein the ratio of the discharge current value to the peak current is a specified ratio.

[0124] After the mixing motor 13 has passed the maximum current in the current mixing cycle, the current second current value of the mixing motor 13 is obtained;

[0125] When the second current value is less than the discharge current value, a prompt message is generated for adding chlorinated polyethylene to the first container;

[0126] After a first specified time period following the generation of the prompt message, the electrically controlled valve in the first container is opened to discharge the mixed material from the first container.

[0127] Optionally, the target process control strategy also includes a maximum mixing time. The second control unit 330 can also be used to: control the electric control valve to open when the first mixing time reaches the maximum mixing time, and when the electric control valve of the first container is continuously closed during the first mixing time, so as to discharge the mixed material in the first container.

[0128] Optionally, the target process control strategy also includes a preset idling current. The second control unit 330 can also be used to: control the solenoid valve to close after a second specified time after the solenoid valve is opened; or, after the second specified time after the solenoid valve is opened, and when the current value of the mixing motor 13 is less than or equal to the preset idling current, control the solenoid valve to close.

[0129] Optionally, the polyvinyl chloride mixing control device 300 may further include a reset unit for resetting the mixing equipment 10 when the electrically controlled valve is closed.

[0130] Optionally, the PVC mixing control device 300 may further include a creation unit. Before receiving the discharge signal, the creation unit is used to obtain a process control strategy corresponding to each PVC mixture based on the acquired current curve of the mixing motor 13 in the mixing cycle of each PVC mixture, the shortest mixing time, the longest mixing time, and the time point at which the prompt message for adding chlorinated polyethylene is issued in the mixing cycle.

[0131] Optionally, the mixing device 10 further includes a second container. After generating a prompt message for adding chlorinated polyethylene to the first container, the second control unit 330 can also be used to: control the second container pre-filled with chlorinated polyethylene to add chlorinated polyethylene to the first container.

[0132] In this embodiment, the processing module 11 can be an integrated circuit chip with signal code processing capabilities. The processing module 11 can be a general-purpose processor. For example, the processor can be a Central Processing Unit (CPU), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components, capable of implementing or executing the methods, steps, and logic block diagrams disclosed in the embodiments of this application.

[0133] The storage module 12 can be, but is not limited to, a random access memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, etc. In this embodiment, the storage module 12 can be used to store the process control strategy corresponding to each polyvinyl chloride compound. Of course, the storage module 12 can also be used to store a program, which the processing module 11 executes after receiving the execution instruction.

[0134] Understandable, Figure 1 The mixing device 10 shown is only a schematic diagram; the mixing device 10 may also include a ratio Figure 1 More components are shown. Figure 1 The components shown can be implemented using hardware, software, or a combination thereof.

[0135] It should be noted that those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the mixing equipment 10 described above can be referred to the corresponding process of each step in the aforementioned method, and will not be elaborated further here.

[0136] Based on the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by hardware or by using software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of this application can be embodied in the form of a software product. The software product can be stored in a non-volatile storage medium (such as CD-ROM, USB flash drive, mobile hard drive, etc.) and includes several instructions to cause a computer device (such as a personal computer, mixing equipment, or network device, etc.) to execute the methods described in the various implementation scenarios of this application.

[0137] In summary, this application provides a method, apparatus, and mixing equipment for controlling PVC mixing. In this solution, based on a preset target type of PVC mixture, a process control strategy corresponding to the target type can be automatically acquired as the target process control strategy. Then, based on a first mixing time and the target process control strategy, a mixing motor is controlled to stir and mix the materials in the first container. The stirring and mixing time exceeds the minimum mixing time. Thus, the appropriate process control strategy can be automatically selected for different PVC mixtures, eliminating the need for manual control by professional operators. This improves the quality of PVC mixtures and mitigates the problem of human factors affecting PVC mixture quality.

[0138] In the embodiments provided in this application, it should be understood that the disclosed apparatus, systems, and methods can also be implemented in other ways. The apparatus, systems, and methods embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions. Furthermore, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0139] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method of polyvinyl chloride compounding control, characterized by, The application is applied to a mixing device, the mixing device comprises a mixing motor and a first container, the mixing motor is used for stirring and mixing materials in the first container, and the method comprises: When a discharging signal is received, the mixing motor is controlled to operate to stir the materials in the first container, and a first mixing time length of the mixing motor is recorded, the materials comprising polyvinyl chloride and auxiliary materials; Based on a preset target type of polyvinyl chloride mixing, a process control strategy corresponding to the target type is acquired as a target process control strategy, the target process control strategy comprising a shortest mixing time length; Based on the first mixing time length and the target process control strategy, the mixing motor is controlled to stir and mix the materials in the first container, wherein the stirring and mixing time length exceeds the shortest mixing time length; The target process control strategy comprises a preset specified maximum current value and a discharging current value of the mixing motor, based on the first mixing time length and the target process control strategy, the mixing motor is controlled to stir and mix the materials in the first container, comprising: The mixing motor is controlled to continuously operate, and when the first mixing time length reaches the shortest mixing time length, a current value of the mixing motor is acquired as a first current value at a specified frequency; It is judged whether the first current value is greater than the specified maximum current value; After the first current value is greater than the specified maximum current value, a second current value of the mixing motor at present is acquired; When the second current value is less than the discharging current value, prompt information for adding chlorinated polyethylene to the first container is generated; When the first specified time length after the prompt information is generated, an electric control valve in the first container is controlled to be opened to discharge the mixed materials in the first container.

2. The method of claim 1, wherein, The target process control strategy further comprises a specified current difference value, based on the first mixing time length and the target process control strategy, the mixing motor is controlled to stir and mix the materials in the first container, comprising: The mixing motor is controlled to continuously operate, and when the first mixing time length reaches the shortest mixing time length, a plurality of current values of the mixing motor are acquired at a specified frequency, the plurality of current values being arranged in time sequence; When, in the plurality of current values, there is a peak current, and after the peak current, there is a current value with a difference greater than the specified current difference value from the peak current, it is determined that the mixing motor has passed the maximum current in a current mixing period, and the peak current is the maximum current in the current mixing period; Based on the peak current, a discharging current value is determined, wherein a ratio of the discharging current value to the peak current is a specified ratio; After the mixing motor has passed the maximum current in the current mixing period, a second current value of the mixing motor at present is acquired; When the second current value is less than the discharging current value, prompt information for adding chlorinated polyethylene to the first container is generated; When the first specified time length after the prompt information is generated, an electric control valve in the first container is controlled to be opened to discharge the mixed materials in the first container.

3. The method of claim 2, wherein, The target process control strategy further comprises a longest mixing duration, and the method further comprises: when the first mixing duration reaches the longest mixing duration and the electric control valve of the first container continuously stays in the closed state within the first mixing duration, the electric control valve is controlled to be opened to discharge the mixed material in the first container.

4. The method of claim 2, wherein, The target process control strategy further comprises a preset idle current, and the method further comprises: controlling the electric control valve to be closed after a second specified duration after the electric control valve is opened; or, controlling the electric control valve to be closed after the second specified duration after the electric control valve is opened and the current value of the mixing motor is less than or equal to the preset idle current.

5. The method of claim 4, wherein, The method further comprises: resetting the mixing device when the electric control valve is closed.

6. The method of claim 2, wherein, Before receiving the discharging signal, the method further comprises: obtaining a process control strategy corresponding to each kind of polyvinyl chloride mixture based on the obtained current curve of the mixing motor in the mixing cycle of each kind of polyvinyl chloride mixture, the shortest mixing duration, the longest mixing duration, and the time point of issuing the prompt information of adding chlorinated polyethylene in the mixing cycle.

7. The method of claim 2, wherein, The mixing device further comprises a second container, and after the prompt information for adding chlorinated polyethylene to the first container is generated, the method further comprises: controlling the second container pre-contained with chlorinated polyethylene to add chlorinated polyethylene to the first container.

8. A polyvinyl chloride compound control device, characterized by comprising: The method of any one of claims 1-7 is applied to a mixing device comprising a mixing motor and a first container, the mixing motor being used to stir and mix the material in the first container, and the device comprises: a first control unit configured to control the mixing motor to operate to stir the material in the first container when a discharging signal is received, and record a first mixing duration of the mixing motor, the material comprising polyvinyl chloride and auxiliary materials; an acquisition unit configured to acquire a process control strategy corresponding to a target kind of polyvinyl chloride mixture as a target process control strategy based on a preset target kind of polyvinyl chloride mixture, the target process control strategy comprising a shortest mixing duration; a second control unit configured to control the mixing motor to stir and mix the material in the first container based on the first mixing duration and the target process control strategy, wherein the stirring and mixing duration exceeds the shortest mixing duration.

9. A compounding apparatus characterized by comprising: The mixing device comprises a mixing motor, a first container, a processor, and a memory, the memory storing a computer program, when the computer program is executed by the processor, the mixing device executes the method of any one of claims 1-7.

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