Multistage precision control method of powder liquid weighing system

Abstract

The invention provides a multistage precision control method of a powder liquid weighing system, and relates to the technical field of weighing control, and the method comprises the following steps: collecting characteristic parameters of a powder liquid material, and setting an initial precision grade according to the characteristic parameters of the material; based on the initial precision grade, three-stage segmented control is adopted for weighing, and the three-stage segmented control comprises a coarse feeding stage, a middle feeding stage and a fine feeding stage; in the weighing process, self-adaptive residual quantity compensation is carried out according to powder flying dust and liquid adhesion conditions; judging whether the target weight is reached or not according to the compensated weighing result, if not, continuing feeding, and if yes, stopping feeding; according to the invention, by constructing a material characteristic parameter acquisition and hierarchical control mechanism, accurate adaptation to characteristics such as powder flying dust and liquid adhesion is realized, a control strategy can be dynamically adjusted according to physical attributes of different materials, the problem of poor compatibility of traditional weighing equipment to multiple materials is effectively solved, and the weighing efficiency is improved. And the adaptation capability of a complex mixing process is obviously improved.

Description

Technical Field

[0001] This invention relates to the field of weighing control technology, and in particular to a multi-level precision control method for a powder and liquid weighing system. Background Technology

[0002] In the production of membrane products, the accuracy of raw material mixing directly affects product quality, and weighing accuracy is the core link of the mixing process.

[0003] Traditional weighing systems have significant limitations: First, a single precision mode cannot balance efficiency and accuracy. While coarse feeding is fast, it has a large error rate, making it difficult to meet high-precision production requirements. Precision mode, although controlling the error within ±0.1%, has an extremely slow feeding speed, increasing the time required for each weighing and severely restricting production efficiency. Second, they lack adaptability to material characteristics. Different powders and liquids have significantly different physical properties; for example, powders are prone to dust generation, and liquids are prone to adhesion. Traditional systems do not have differentiated control strategies designed for these characteristics, leading to deviations between the weighing results and the actual amount added, affecting the accuracy of the mixing ratio. Furthermore, the lack of a residual amount handling mechanism is another key issue. During feeding, powder dust adheres to the inner wall of the weighing equipment, and liquid adhesion leads to pipeline residue. These unmeasured materials cause the final weighing result to be lower than the actual input amount. Traditional systems only correct with fixed parameters and cannot dynamically adapt to changes in material characteristics, further exacerbating accuracy fluctuations. Therefore, this invention proposes a multi-level precision control method for powder and liquid weighing systems to solve the problems existing in the prior art. Summary of the Invention

[0004] To address the aforementioned issues, this invention proposes a multi-level precision control method for powder and liquid weighing systems. This method, by constructing a material characteristic parameter acquisition and tiered control mechanism, achieves precise adaptation to characteristics such as powder dust and liquid adhesion. It can dynamically adjust the control strategy according to the physical properties of different materials, effectively solving the problem of poor compatibility of traditional weighing equipment with multiple materials and significantly improving the adaptability to complex mixing processes.

[0005] To achieve the objectives of this invention, the invention is implemented through the following technical solution: a multi-level precision control method for a powder / liquid weighing system, comprising the following steps:

[0006] S1: Collect the characteristic parameters of powder and liquid materials, and set the initial accuracy level according to the material characteristic parameters;

[0007] S2: Based on the initial accuracy level, a three-level segmented control is used for weighing, including the coarse feeding stage, the medium feeding stage, and the fine feeding stage;

[0008] S3: During the weighing process, adaptive compensation for residual amount is performed based on powder dust and liquid adhesion;

[0009] S4: Determine whether the target weight has been reached based on the compensated weighing result. If not, continue adding material; if it has been reached, stop adding material.

[0010] Further improvements are made in the following aspects: In step S1, the collected material characteristic parameters include the particle size distribution, flowability, and dust coefficient of powder materials, and the viscosity, density, and adhesion coefficient of liquid materials; the initial accuracy level is set using the following algorithm: Let the comprehensive index of material characteristics be S, then S = w1×P + w2×F + w3×Dy + w4×V + w5×Dl + w6×Df

[0011] Where w1, w2, w3, w4, w5, and w6 are the weighting coefficients of each parameter, and w1+w2+w3+w4+w5+w6=1; P is the powder particle size distribution index, F is the powder flowability index, Dy is the powder dust coefficient, V is the liquid viscosity index, Dl is the liquid density index, and Df is the liquid adhesion coefficient; the initial accuracy level is determined according to the magnitude of the comprehensive index S of material characteristics, and the larger S is, the higher the initial accuracy level.

[0012] A further improvement is that, in S2, the feeding speed and accuracy requirements of the coarse feeding stage, the medium feeding stage, and the fine feeding stage in the three-level segmented control are determined according to the initial accuracy level.

[0013] Coarse feeding stage: feeding speed is v1, and the accuracy error range is ±e1;

[0014] During the feeding stage: the feeding speed is v2, and the accuracy error range is ±e2;

[0015] Fine feeding stage: feeding speed is v3, and the accuracy error range is ±e3;

[0016] Where v1 > v2 > v3, e1 > e2 > e3, and the values ​​of v1, v2, v3 and e1, e2, e3 are determined by looking up a table based on the initial precision level.

[0017] Further improvements are made in that the three-level segmented control uses the following algorithm to optimize the feeding process:

[0018] Let the target weight be M, the current added weight be m, and the remaining target weight be Mm; when m < α1 × M, it is in the coarse feeding stage, and the material is added at a speed v1; when α1 × M ≤ m < α2 × M, it is in the medium feeding stage, and the material is added at a speed v2; when m ≥ α2 × M, it is in the fine feeding stage, and the material is added at a speed v3; where α1 and α2 are segmented thresholds, and 0 < α1 < α2 < 1, and the values ​​of α1 and α2 are determined according to the initial accuracy level.

[0019] A further improvement is that, in step S3, the adaptive compensation for residual amount includes the following steps:

[0020] Real-time monitoring of weight changes in the weighing equipment, recording the weight difference Δm before and after each feeding;

[0021] Based on the material type and the current weighing status, the corresponding compensation algorithm is invoked to calculate the residual compensation value Δm. comp ;

[0022] The residual compensation value Δm comp Add it to the current weighing result to obtain the compensated weighing result m. comp =m+Δm comp .

[0023] Further improvements are made in the following way: For powder materials, the residual amount compensation algorithm is as follows: Let the dust emission coefficient of the powder be Dy, and the current feeding weight be m. add Then the residual compensation value Δm comp-p =kp×Dy×m add , where kp is the powder residue compensation coefficient, which is determined based on experimental data.

[0024] Further improvements are made in the following way: For liquid materials, the residual amount compensation algorithm is as follows: Let the liquid viscosity coefficient be Df, and the current feed weight be m. add Then the residual compensation value Δm comp-l =kl×Df×m add , where kl is the liquid residue compensation coefficient, which is determined based on experimental data.

[0025] A further improvement is made in S3, where the weighing equipment is calibrated in real time during the weighing process to eliminate the influence of equipment errors on the weighing results. The calibration method is as follows: the weighing equipment is calibrated periodically using standard weights, and the weighing deviation Δm before and after calibration is recorded. cal According to the weighing deviation Δm cal Correct the current weighing result.

[0026] Further improvements are made in S4, after the judgment is completed, data storage and analysis are performed, storing the material characteristic parameters, weighing results, and compensation values ​​for each weighing, analyzing the stored data, and adjusting the weighting coefficients of the material characteristic parameters, the parameters of the three-level segmented control, and the residual compensation coefficient.

[0027] The beneficial effects of this invention are as follows:

[0028] 1. This invention achieves precise adaptation to the characteristics of powder dust, liquid adhesion, etc. by constructing a material characteristic parameter acquisition and classification control mechanism. It can dynamically adjust the control strategy according to the physical properties of different materials, effectively solve the problem of poor compatibility of traditional weighing equipment with multiple materials, and significantly improve the adaptability of complex mixing processes.

[0029] 2. This invention adopts a three-level segmented control mode, which breaks through the limitations of single precision control. By dynamically switching between the coarse feeding, medium feeding and fine feeding stages, the weighing time is greatly shortened while ensuring the final accuracy. It takes into account both efficiency and accuracy, avoids the high error of coarse feeding, and overcomes the inefficiency of precision mode, thus improving weighing efficiency.

[0030] 3. This invention introduces adaptive residual amount compensation technology, which dynamically compensates for weighing deviations caused by powder dust adhesion and liquid adhesion through real-time monitoring and algorithm correction. Combined with a periodic calibration mechanism, the system can automatically eliminate the influence of equipment error and material residue, improving the weighing accuracy to within ±0.3%, which is far superior to the error level of traditional equipment, and provides more reliable quality assurance for membrane product mixing. Attached Figure Description

[0031] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0032] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0033] Example 1

[0034] according to Figure 1 As shown in the figure, this embodiment proposes a multi-level precision control method for a powder-liquid weighing system, including the following steps:

[0035] S1: Collect characteristic parameters of powder and liquid materials, and set the initial accuracy level based on the material characteristic parameters; the collected material characteristic parameters include particle size distribution, flowability, and dust coefficient of powder materials, and viscosity, density, and adhesion coefficient of liquid materials; the initial accuracy level is set using the following algorithm: Let the comprehensive index of material characteristics be S, S=w1×P+w2×F+w3×Dy+w4×V+w5×Dl+w6×Df

[0036] Where w1, w2, w3, w4, w5, and w6 are the weighting coefficients of each parameter, and w1+w2+w3+w4+w5+w6=1; P is the powder particle size distribution index, F is the powder flowability index, Dy is the powder dust emission coefficient, V is the liquid viscosity index, Dl is the liquid density index, and Df is the liquid adhesion coefficient; the initial accuracy level is determined according to the magnitude of the comprehensive index S of material properties, with a larger S indicating a higher initial accuracy level.

[0037] S2: Based on the initial accuracy level, a three-level segmented control is adopted for weighing, including the coarse feeding stage, the medium feeding stage, and the fine feeding stage; in the three-level segmented control, the feeding speed and accuracy requirements of the coarse feeding stage, the medium feeding stage, and the fine feeding stage are determined according to the initial accuracy level;

[0038] Coarse feeding stage: feeding speed is v1, and the accuracy error range is ±e1;

[0039] During the feeding stage: the feeding speed is v2, and the accuracy error range is ±e2;

[0040] Fine feeding stage: feeding speed is v3, and the accuracy error range is ±e3;

[0041] Where v1 > v2 > v3, e1 > e2 > e3, and the values ​​of v1, v2, v3 and e1, e2, e3 are determined by looking up a table based on the initial precision level;

[0042] The three-level segmented control uses the following algorithm to optimize the feeding process:

[0043] Let the target weight be M, the current added weight be m, and the remaining target weight be Mm. When m < α1 × M, it is in the coarse feeding stage, and feeding is done at speed v1. When α1 × M ≤ m < α2 × M, it is in the medium feeding stage, and feeding is done at speed v2. When m ≥ α2 × M, it is in the fine feeding stage, and feeding is done at speed v3. Here, α1 and α2 are segmentation thresholds, and 0 < α1 < α2 < 1. The values ​​of α1 and α2 are determined according to the initial accuracy level.

[0044] S3: During the weighing process, adaptive compensation for residual amount is performed based on powder dust and liquid adhesion; adaptive compensation for residual amount includes the following steps:

[0045] Real-time monitoring of weight changes in the weighing equipment, recording the weight difference Δm before and after each feeding;

[0046] Based on the material type and the current weighing status, the corresponding compensation algorithm is invoked to calculate the residual compensation value Δm. comp ;

[0047] The residual compensation value Δm comp Add it to the current weighing result to obtain the compensated weighing result m.comp =m+Δm comp .

[0048] For powder materials, the residual amount compensation algorithm is as follows: Let the dust emission coefficient of the powder be Dy, and the current feed weight be m. add Then the residual compensation value Δm comp-p =kp×Dy×m add , where kp is the powder residue compensation coefficient, which is determined based on experimental data.

[0049] For liquid materials, the residual compensation algorithm is as follows: Let the liquid viscosity coefficient be Df, and the current feed weight be m. add Then the residual compensation value Δm comp-l =kl×Df×m add , where kl is the liquid residue compensation coefficient, which is determined based on experimental data.

[0050] During the weighing process, the weighing equipment is calibrated in real time to eliminate the influence of equipment errors on the weighing results. The calibration method is as follows: the weighing equipment is calibrated periodically using standard weights, and the weighing deviation Δm before and after calibration is recorded. cal According to the weighing deviation Δm cal Correct the current weighing result.

[0051] S4: Determine whether the target weight has been reached based on the compensated weighing result. If not, continue feeding; if reached, stop feeding. After the determination, perform data storage and analysis, storing the material characteristic parameters, weighing results, and compensation values ​​for each weighing. Analyze the stored data and adjust the weighting coefficients of the material characteristic parameters, the parameters of the three-level segmented control, and the residual compensation coefficient.

[0052] Example 2

[0053] according to Figure 1 As shown in the figure, this embodiment proposes a multi-level precision control method for a powder-liquid weighing system, including the following steps:

[0054] Before weighing begins, sensors collect characteristic parameters such as particle size distribution, flowability, and dust coefficient of powder materials, and viscosity, density, and adhesion coefficient of liquid materials. A comprehensive material characteristic index S is calculated using an algorithm. For example, weighting coefficients w1 = 0.2, w2 = 0.2, w3 = 0.2, w4 = 0.1, w5 = 0.1, and w6 = 0.2 are set. S is calculated based on the collected parameter values, and an initial accuracy level is determined according to the magnitude of S: S < 0.3 is low accuracy, 0.3 ≤ S < 0.6 is medium accuracy, and S ≥ 0.6 is high accuracy.

[0055] The feeding speed and accuracy requirements for the coarse feeding stage, the intermediate feeding stage, and the fine feeding stage are determined based on the initial accuracy level. For example, for a high accuracy level, α1 = 0.6, α2 = 0.9, v1 = 100 g / s, e1 = 2%, v2 = 50 g / s, e2 = 1%, v3 = 10 g / s, and e3 = 0.1%. During the weighing process, the remaining target weight is calculated in real time, and the algorithm determines which feeding stage is currently in, feeding is then performed according to the corresponding speed and accuracy requirements.

[0056] Before and after each feeding, the weight change of the weighing equipment is monitored in real time, and the weight difference Δm is recorded. The appropriate compensation algorithm is then called to calculate the residual compensation value based on the material type. For example, for powder materials, if the dust coefficient Dy = 0.05, and the current feeding weight m... add =500g, powder residue compensation coefficient kp = 0.02, then the residue compensation value Δm comp-p =0.02×0.05×500=0.5g. Add the residual compensation value to the current weighing result to obtain the compensated weighing result.

[0057]

[0058]

[0059] Regularly calibrate the weighing equipment using standard weights, and record the weighing deviation Δm before and after calibration. cal The system corrects the current weighing result. Simultaneously, it stores information such as material characteristic parameters, weighing results, and compensation values ​​from each weighing in a database. By analyzing the stored data, it optimizes the weighting coefficients of material characteristic parameters, the parameters of the three-level segmented control, and the residual compensation coefficient, continuously improving the performance and stability of the weighing system.

[0060] Through the above steps, the multi-level precision control method of the powder and liquid weighing system of the present invention can achieve differentiated precision control for different powder and liquid material characteristics, improve weighing efficiency and accuracy, ensure the accuracy of raw material mixing during the production of membrane products, and thus improve the quality stability of membrane products.

[0061] This multi-level precision control method for powder and liquid weighing systems achieves precise adaptation to characteristics such as powder dust and liquid adhesion by constructing a material characteristic parameter acquisition and graded control mechanism. It can dynamically adjust the control strategy according to the physical properties of different materials, effectively solving the problem of poor compatibility of traditional weighing equipment with multiple materials and significantly improving the adaptability to complex mixing processes. Adopting a three-level segmented control mode, it breaks through the limitations of single-precision control. Through dynamic switching between coarse feeding, medium feeding, and fine feeding stages, it significantly shortens weighing time while ensuring final accuracy, balancing efficiency and precision. It avoids the high errors of coarse feeding and overcomes the inefficiency of precision mode, thus improving weighing efficiency. Adaptive residual compensation technology is introduced to dynamically compensate for weighing deviations caused by powder dust adhesion and liquid adhesion through real-time monitoring and algorithm correction. Combined with a periodic calibration mechanism, the system can automatically eliminate the influence of equipment errors and material residues, improving weighing accuracy to within ±0.3%, far superior to the error level of traditional equipment, providing more reliable quality assurance for membrane product mixing.

[0062] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-level precision control method for a powder / liquid weighing system, characterized in that, Includes the following steps: S1: Collect the characteristic parameters of powder and liquid materials, and set the initial accuracy level according to the material characteristic parameters; S2: Based on the initial accuracy level, a three-level segmented control is used for weighing, including the coarse feeding stage, the medium feeding stage, and the fine feeding stage; S3: During the weighing process, adaptive compensation for residual amount is performed based on powder dust and liquid adhesion; S4: Determine whether the target weight has been reached based on the compensated weighing result. If not, continue adding material; if it has been reached, stop adding material.

2. The multi-level precision control method for a powder / liquid weighing system according to claim 1, characterized in that: In step S1, the collected material characteristic parameters include particle size distribution, flowability, and dust coefficient of powder materials, and viscosity, density, and adhesion coefficient of liquid materials. The initial accuracy level is set using the following algorithm: Let the comprehensive index of material characteristics be S, then S = w1×P + w2×F + w3×Dy + w4×V + w5×Dl + w6×Df Where w1, w2, w3, w4, w5, and w6 are the weighting coefficients of each parameter, and w1+w2+w3+w4+w5+w6=1; P is the powder particle size distribution index, F is the powder flowability index, Dy is the powder dust coefficient, V is the liquid viscosity index, Dl is the liquid density index, and Df is the liquid adhesion coefficient; the initial accuracy level is determined according to the magnitude of the comprehensive index S of material characteristics, and the larger S is, the higher the initial accuracy level.

3. The multi-level precision control method for a powder / liquid weighing system according to claim 1, characterized in that: In S2, the feeding speed and accuracy requirements of the coarse feeding stage, the medium feeding stage and the fine feeding stage in the three-level segmented control are determined according to the initial accuracy level. Coarse feeding stage: feeding speed is v1, and the accuracy error range is ±e1; During the feeding stage: the feeding speed is v2, and the accuracy error range is ±e2; Fine feeding stage: feeding speed is v3, and the accuracy error range is ±e3; Where v1 > v2 > v3, e1 > e2 > e3, and the values ​​of v1, v2, v3 and e1, e2, e3 are determined by looking up a table based on the initial precision level.

4. The multi-level precision control method for a powder / liquid weighing system according to claim 3, characterized in that: The three-level segmented control uses the following algorithm to optimize the feeding process: Let the target weight be M, the current added weight be m, and the remaining target weight be Mm; when m < α1 × M, it is in the coarse feeding stage, and the material is added at a speed v1; when α1 × M ≤ m < α2 × M, it is in the medium feeding stage, and the material is added at a speed v2; when m ≥ α2 × M, it is in the fine feeding stage, and the material is added at a speed v3; where α1 and α2 are segmented thresholds, and 0 < α1 < α2 < 1, and the values ​​of α1 and α2 are determined according to the initial accuracy level.

5. The multi-level precision control method for a powder / liquid weighing system according to claim 1, characterized in that: In step S3, the adaptive compensation for residual amount includes the following steps: Real-time monitoring of weight changes in the weighing equipment, recording the weight difference Δm before and after each feeding; Based on the material type and the current weighing status, the corresponding compensation algorithm is invoked to calculate the residual compensation value Δm. comp ; The residual compensation value Δm comp Add it to the current weighing result to obtain the compensated weighing result m. comp =m+Δm comp .

6. The multi-level precision control method for a powder / liquid weighing system according to claim 5, characterized in that: For powder materials, the residual amount compensation algorithm is as follows: Let the dust emission coefficient of the powder be Dy, and the current feed weight be m. add Then the residual compensation value Δm comp-p =kp×Dy×m add , where kp is the powder residue compensation coefficient, which is determined based on experimental data.

7. The multi-level precision control method for a powder / liquid weighing system according to claim 5, characterized in that: For liquid materials, the residual compensation algorithm is as follows: Let the liquid viscosity coefficient be Df, and the current feed weight be m. add Then the residual compensation value Δm comp-l =kl×Df×m add , where kl is the liquid residue compensation coefficient, which is determined based on experimental data.

8. The multi-level precision control method for a powder / liquid weighing system according to claim 1, characterized in that: In step S3, the weighing equipment is calibrated in real time during the weighing process to eliminate the influence of equipment errors on the weighing results. The calibration method is as follows: the weighing equipment is calibrated periodically using standard weights, and the weighing deviation Δm before and after calibration is recorded. cal According to the weighing deviation Δm cal Correct the current weighing result.

9. The multi-level precision control method for a powder / liquid weighing system according to claim 1, characterized in that: In step S4, after the judgment is completed, data storage and analysis are performed. The material characteristic parameters, weighing results, and compensation values ​​of each weighing are stored. The stored data are analyzed, and the weighting coefficients of the material characteristic parameters, the parameters of the three-level segmented control, and the residual compensation coefficient are adjusted.

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