Mixing machine filling rate automatic control method and mixing machine

Abstract

The invention relates to the technical field of mixing machine filling rate automatic control, in particular to a mixing machine filling rate automatic control method and a mixing machine, and the method comprises the following steps: calculating the filling rate of the mixing machine based on the dispersion degree of all rotation speed data of the mixing machine in the last time period and the dispersion degree and average distribution condition of all rotation speed data of the mixing machine in a preset time period; determining a filling distribution coefficient of the mixer at the current moment, and determining a filling rate offset coefficient of the mixer at the current moment in combination with the filling rate difference coefficient; and the filling mass and the filling volume of the mixed materials in the mixing machine are obtained for multiple times, and the mixed materials in the mixing machine are controlled in combination with the filling rate deviation coefficient. According to the invention, the data change during the operation of the mixing machine is monitored in real time, so that the filling rate adjustment precision of the mixing machine is improved.

Description

Technical Field

[0001] The present application relates to the technical field of automatic control of the filling rate of a mixer, and in particular to an automatic control method of the filling rate of a mixer and a mixer. Background Art

[0002] With the continuous advancement of industrialization, plastic products have occupied an important position in many industries due to their excellent performance and wide range of uses. Polyvinyl chloride (PVC), as a commonly used plastic material, is widely used in many fields such as construction, packaging, and automobiles. The production process of PVC mainly includes the mixing, plasticization, and molding of raw materials. Among them, the mixing process is the key step to ensure the quality and performance of PVC products. During the mixing process, the uniformity of the mixed materials directly affects the quality of the final product. Therefore, how to achieve efficient and uniform mixing of PVC has become an important issue to improve production efficiency and product quality.

[0003] At present, when using a mixer to mix raw materials, the filling rate of the mixer is one of the main factors affecting the mixing effect, and the control of the filling rate of the mixer still faces many challenges. The existing filling rate automatic control method often sets a filling rate threshold range based on experience. When mixing different batches of raw materials, it often relies on a single parameter (such as weight or volume) to control the filling rate. However, this method has poor adaptability to changes in the density of the mixed materials. Different batches of raw materials may not be exactly the same, resulting in large differences in the density of different batches of mixed materials. However, setting a fixed filling rate threshold range lacks relatively accurate consideration of this density difference, which reduces the accuracy of adjusting the filling rate of the mixer. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of this application is to provide a mixer filling rate automatic control method and a mixer, and the technical solutions adopted are as follows: In a first aspect, an embodiment of the present application provides a method for automatically controlling a filling rate of a mixer, the method comprising the following steps: Obtain the rotation speed data of the mixer at all sampling moments within a preset time period before the current moment, and the vibration data of the mixer at all sampling moments in all directions; Divide the preset time into multiple time periods, and determine the vibration measurement value of the mixer at the current moment based on the discrete degree of all vibration data in each direction of the mixer in each time period; determine the difference degree of the mixer in each time period based on the difference of all vibration data between any two directions of the mixer in each time period, and determine the filling rate difference coefficient of the mixer at the current moment in combination with the vibration measurement value; Based on the discreteness of all the rotation speed data of the mixer in the last period before the current moment, and the discreteness and average distribution of all the rotation speed data of the mixer in the preset time, determine the filling distribution coefficient of the mixer at the current moment, and combine the filling rate difference coefficient to determine the filling rate deviation coefficient of the mixer at the current moment; The filling mass and filling volume of the mixed material in the mixer are obtained multiple times, and the first and second fitting functions of the mixer are determined in combination with the filling rate offset coefficient; based on the first and second fitting functions and the filling rate offset coefficient, the filling mass adjustment amount of the mixer at the current moment is determined to control the mixed material in the mixer.

[0005] Preferably, the method for determining the vibration measurement value of the mixer at the current moment is: Calculating the variance of all vibration data in all directions of the mixer in each time period, fitting the variance of the vibration data in all directions of the mixer in all time periods, and obtaining a fitting straight line in all directions of the mixer; The vibration measurement value of the mixer at the current moment is the average level of the slope of the fitting line in all directions of the mixer.

[0006] Preferably, the method for determining the difference of the mixer in each time period is: Calculate the difference of all vibration data between any two directions of the mixer in each period, and record it as the difference value between any two directions of the mixer in each period; The difference degree of the mixer in each period is the mean of the difference values ​​between all two-direction combinations of the mixer in each period.

[0007] Preferably, the expression of the filling rate difference coefficient of the mixer at the current moment is: ; In the formula, A represents the filling rate difference coefficient of the mixer at the current moment; Indicates the vibration measurement value of the mixer at the current moment; Indicates the difference between the mixers in the last period before the current moment; It indicates the difference between the mixers in time period i before the current moment; represents the difference of the mixer in the time period i+1 before the current moment; n represents the number of all time periods within the preset time length before the current moment.

[0008] Preferably, the method for determining the filling distribution coefficient of the mixer at the current moment is: Record the discrete degree of all the rotation speed data of the mixer in the last period before the current moment as the first discrete degree of the mixer at the current moment; Record the discrete degree of all the rotation speed data of the mixer within a preset time period before the current moment as the second discrete degree of the mixer at the current moment; The product of the average level of all the rotation speed data of the mixer within a preset time before the current moment and the second discrete degree is calculated, and the ratio of the first discrete degree to the product is used as the filling distribution coefficient of the mixer at the current moment.

[0009] Preferably, the expression of the filling rate deviation coefficient of the mixer at the current moment is: ; In the formula, Indicates the filling rate deviation coefficient of the mixer at the current moment; It represents the filling distribution coefficient of the mixer at the current moment; exp( ) represents an exponential function with a natural constant as the base.

[0010] Preferably, the method for determining the first and second fitting functions of the mixer at the current moment is: When the components of the mixed materials in the mixer are the same, record the different filling masses and corresponding filling volumes of the mixed materials, collect the filling mass and filling volume each time, and calculate the filling rate deviation coefficient of the mixer under the corresponding collection according to the method for obtaining the filling rate deviation coefficient of the mixer at the current moment; The ratio of the filling mass and the filling volume of the mixed material collected each time is taken as the filling density of the mixed material collected each time; Under all acquisitions, the minimum value of the filling rate deviation coefficient under all acquisitions corresponding to each filling density is obtained, and the filling mass of the mixed material under the acquisition corresponding to the minimum value is taken as the optimal filling mass of the filling density; All filling densities and their respective optimal filling masses are used as independent variables and dependent variables of the fitting algorithm, and a fitting function between the filling density and the optimal filling mass is output as a first fitting function; When the filling mass of the mixed materials in the mixer is the same, the filling volume of the mixed materials with different types is obtained, and the filling density is calculated; The filling rate deviation coefficients and respective filling densities of the mixers collected at all times are used as the independent variable and dependent variable of the fitting algorithm, and a fitting function between the filling rate deviation coefficient and the filling density is output as the second fitting function.

[0011] Preferably, the expression of the filling mass adjustment amount of the mixer at the current moment is: ; In the formula, Indicates the filling mass adjustment amount of the mixer at the current moment; Indicates the filling rate deviation coefficient of the mixer at the current moment; represents the first fitting function of the mixer at the current moment; represents the second fitting function of the mixer at the current moment; M represents the preset filling quality.

[0012] Preferably, the controlling of the mixed material in the mixer comprises: If the filling mass adjustment amount of the mixer at the current moment is a negative number, the discharge port of the mixer is opened to discharge the mixed material of the filling mass adjustment amount; if the filling mass adjustment amount of the mixer at the current moment is a positive number, the feed port of the mixer is opened to inject the mixed material of the filling mass adjustment amount.

[0013] In a second aspect, an embodiment of the present application further provides a mixer, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein when the processor executes the computer program, the steps of any one of the above-mentioned methods for automatically controlling the filling rate of a mixer are implemented.

[0014] This application has at least the following beneficial effects: The present application divides the preset time into multiple time periods, and determines the vibration measurement value of the mixer at the current moment based on the discrete degree of all vibration data in each direction of the mixer in each time period; determines the difference degree of the mixer in each time period based on the difference of all vibration data between any two directions of the mixer in each time period, and determines the filling rate difference coefficient of the mixer at the current moment in combination with the vibration measurement value, which has the beneficial effect of enhancing the accuracy of judging the mixing uniformity of the mixed materials; The present application determines the filling distribution coefficient of the mixer at the current moment based on the discrete degree of all the speed data of the mixer in the last period, and the discrete degree and average distribution of all the speed data of the mixer in the preset time, and determines the filling rate deviation coefficient of the mixer at the current moment in combination with the filling rate difference coefficient. The beneficial effect is that the accuracy of measuring the filling rate being too large or too small is improved, thereby improving the accuracy of the filling rate adjustment; The present application obtains the filling mass and filling volume of the mixed material in the mixer multiple times, and determines the first and second fitting functions of the mixer in combination with the filling rate offset coefficient; based on the first and second fitting functions and the filling rate offset coefficient, determines the filling mass adjustment amount of the mixer at the current moment, and controls the mixed material in the mixer, which has the beneficial effect of improving the uniformity of the mixed material in the mixer. The present application improves the accuracy of the filling rate adjustment of the mixer by real-time monitoring of the data changes during the operation of the mixer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A flowchart of a method for automatically controlling a filling rate of a mixer provided in one embodiment of the present application; Figure 2 A schematic diagram of a filling distribution coefficient acquisition process provided by an embodiment of the present application; Figure 3 A schematic diagram of a filling rate offset coefficient extraction process provided by an embodiment of the present application; Figure 4 A schematic diagram of a first fitting function provided in one embodiment of the present application; Figure 5 A schematic diagram of a second fitting function provided for one embodiment of the present application. DETAILED DESCRIPTION

[0017] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the following is a detailed description of the automatic control method of the filling rate of a mixer and the mixer proposed in the present application, its specific implementation, structure, features and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0018] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0019] The following is a detailed description of a mixer filling rate automatic control method and a specific scheme of the mixer provided by the present application in conjunction with the accompanying drawings.

[0020] See also Figure 1 , which shows a flow chart of a method for automatically controlling a filling rate of a mixer provided by an embodiment of the present application, the method comprising the following steps: Step S1: Obtain the rotation speed data of the mixer at all sampling moments within a preset time period before the current moment, and the vibration data of the mixer at all sampling moments in all directions.

[0021] When the mixer mixes materials, the agitator stirs the materials, causing three mixing modes: convection, diffusion and shear. At the same time, when the materials are not mixed evenly, the density of the mixed materials at different positions in the mixer is different. When the mixed materials collide with the mixer casing during the mixing process, the vibration of the casing is also inconsistent. Therefore, vibration sensors are installed in different directions on the mixer casing to monitor the vibration changes in different directions.

[0022] In this embodiment, a rotary encoder is installed on the transmission shaft of the agitator to obtain the rotational speed data of the mixer at all sampling moments within a preset time length t before the current moment; vibration sensors are respectively installed in the upper, lower, left and right directions of the mixer housing to obtain the vibration data of all sampling moments in each direction of the mixer within a preset time length t before the current moment, wherein the data sampling frequency is set to f.

[0023] It should be noted that the values ​​of the preset time length t and the data sampling frequency f are both manually set. In this embodiment, the value of the preset time length t is 30s, and the value of the data sampling frequency f is 100Hz. The implementer can also set them according to the specific situation. This embodiment does not impose any special restrictions.

[0024] Step S2: Divide the preset time length into multiple time periods, and determine the vibration measurement value of the mixer at the current moment based on the discrete degree of all vibration data in all directions of the mixer in each time period; determine the difference degree of the mixer in each time period based on the difference between all vibration data between any two directions of the mixer in each time period, and determine the filling rate difference coefficient of the mixer at the current moment in combination with the vibration measurement value.

[0025] In the process of mixing raw materials using a mixer, the existing method is to preset a filling rate range based on experience, then calculate the actual filling rate based on the parameters of the current batch of raw materials (such as weight or volume), and finally adjust the actual filling rate based on the size relationship between the filling rate and the preset filling rate range. This method has high requirements for the accuracy of the preset filling rate range. When there is an error in this range, there will be certain errors in subsequent judgments; and this method does not monitor the mixing process, and there is a possibility that the final mixing effect is poor, affecting production efficiency and quality.

[0026] In fact, during the mixing process, the uniformity of the mixing of the mixed materials and the filling rate of the mixed materials in the mixer will affect the vibration of the mixer and the speed of the agitator. Therefore, the vibration measurement value of the mixer is determined by analyzing the discrete degree of all vibration data in each direction of the mixer in each time period; based on the difference of all vibration data between any two directions of the mixer in each time period, the difference of the mixer in each time period is determined, and combined with the vibration measurement value, the filling rate difference coefficient of the mixer is determined to control the filling rate more flexibly and accurately, specifically: (1) The preset time is evenly divided into multiple time periods, each of which contains the same number of vibration data; It should be noted that in this embodiment, the value of the preset time length t is set to 30s, so the preset time length is divided into 10 segments, that is, the length of each time period is 3s. Since the data sampling frequency is 100Hz, each time period contains 300 vibration data.

[0027] (2) further, calculating the variance of all vibration data in all directions of the mixer in each time period, fitting the variance of the vibration data in all directions of the mixer in all time periods, and obtaining a fitting straight line in all directions of the mixer; It should be noted that there are many commonly used linear fitting algorithms. In this embodiment, the linear least squares method is used to fit the variance of the vibration data. The implementer may also use other linear fitting methods such as linear regression. Regarding the selection of the linear fitting algorithm, this embodiment does not impose any special restrictions.

[0028] The linear least square method is a well-known technique, and the process of obtaining the fitting straight line is not described in detail.

[0029] (3) Further, the average level of the slope of the fitting straight line in all directions of the mixer is recorded as the vibration measurement value of the mixer at the current moment; It should be noted that there are many methods to measure the average level of a set of data. In this embodiment, the average level of the slope of the fitted straight line in all directions of the mixer is measured by calculating the mean of the slope of the fitted straight line in all directions of the mixer. The implementer may also use other methods to measure the average level of data, such as the geometric mean. This embodiment does not impose any special restrictions on the selection of the method to measure the average level of a set of data.

[0030] (4) Calculate the difference of all vibration data between any two directions of the mixer in each time period, and record it as the difference value between any two directions of the mixer in each time period; The average of the difference values ​​between all two-direction combinations of the mixer in each period is recorded as the difference degree of the mixer in each period; It should be noted that there are many methods for measuring the differences between data groups. This embodiment measures the differences between all vibration data between any two directions of the mixer in each time period by calculating the Euclidean distance of all vibration data between any two directions of the mixer in each time period. Implementers may also use other methods for measuring the differences between data groups, such as Manhattan distance and DTW distance. This embodiment does not impose any special restrictions on the selection of methods for measuring the differences between data groups.

[0031] The calculation process of the Euclidean distance is a well-known technique, and the specific calculation steps are not repeated here.

[0032] (5) Further, based on the vibration measurement and the difference, the filling rate difference coefficient of the mixer is determined, specifically: the filling rate difference coefficient of the mixer The expression is: ; In the formula, Indicates the vibration measurement value of the mixer at the current moment; Indicates the difference between the mixers in the last period before the current moment; It indicates the difference between the mixers in time period i before the current moment; represents the difference of the mixer in the time period i+1 before the current moment; n represents the number of all time periods within the preset time length before the current moment.

[0033] Further, according to the filling rate difference coefficient of the mixer, it can be understood that when the filling rate of the mixer is better, the final mixed material has better mixing uniformity, so that the vibration data fluctuations in all directions are getting smaller and smaller, that is, the smaller the variance of all vibration data in all directions of the mixer in each time period, after fitting the variance, it can be seen that the change trend of the fitting straight line is generally downward, that is, the slope of the final fitting straight line is negative and small, and the difference between all vibration data in different directions in the same time period is smaller. As the mixed materials are mixed more and more evenly, the difference becomes smaller and smaller with time, that is, the difference in the last time period is smaller, and the ratio of the difference between the adjacent previous time period and the next time period is greater than 1, so the obtained filling rate difference coefficient is smaller, indicating that the filling rate of the mixer is better; on the contrary, when the filling rate is poor (too large or too small), since the uniformity of the final mixed material is still poor, the filling rate difference coefficient is large.

[0034] Step S3: Based on the discreteness of all the rotational speed data of the mixer in the last time period before the current moment, and the discreteness and average distribution of all the rotational speed data of the mixer in a preset time length, determine the filling distribution coefficient of the mixer at the current moment, and combine the filling rate difference coefficient to determine the filling rate deviation coefficient of the mixer at the current moment.

[0035] The filling rate difference coefficient can only measure whether the filling rate in the mixer is better, but it cannot determine whether the filling rate is too large or too small. Therefore, the filling rate of the mixer cannot be controlled based on the filling rate difference coefficient alone. When the input power of the mixer remains unchanged, the filling rate of the mixer will affect the speed of the agitator.

[0036] When the filling rate is small, the movement space of the mixed materials is large, the gaps between the mixed materials are relatively large, and the friction resistance between the mixed materials is relatively small. Therefore, the movement of the mixed materials under the action of the agitator is less restricted, and the resistance encountered by the agitator when rotating is also small; at the same time, since the mixed materials are relatively sparse, the centrifugal force makes it easier for the mixed materials to move outward during the mixing process and is more easily affected by the density of the mixed materials. For the above reasons, the speed of the agitator is easily affected by the density of the mixed materials when the filling rate is small. During the mixing process of the mixed materials, the speed fluctuates relatively greatly due to the difference in the density of the mixed materials.

[0037] When the filling rate is large, the space for the mixed materials to move is small, the gaps between the mixed materials are relatively small, and the friction between the mixed materials is large. Under the action of the agitator, the movement resistance of the mixed materials is relatively large, and the rotation resistance of the agitator is also large. As a result, even if the density of the mixed materials is different, the speed of the agitator will not change greatly, that is, during the mixing process of the mixed materials, the speed fluctuation of the agitator is relatively small due to the difference in the density of the mixed materials.

[0038] Therefore, in order to improve the accuracy of the adjustment of the filling rate of the mixer, the filling distribution coefficient of the mixer at the current moment is determined based on the discrete degree of all the speed data of the mixer in the last period, and the discrete degree and average distribution of all the speed data of the mixer in the preset time length, and the filling rate deviation coefficient of the mixer at the current moment is determined in combination with the filling rate difference coefficient, which is specifically: (1) Record the discrete degree of all the rotation speed data of the mixer in the last period before the current moment as the first discrete degree of the mixer before the current moment; (2) Further, the discrete degree of all the rotation speed data of the mixer within a preset time period before the current moment is recorded as the second discrete degree of the mixer at the current moment; (3) Calculate the product of the average level of all the rotation speed data of the mixer within a preset time period before the current moment and the second discrete degree, and use the ratio of the first discrete degree to the product as the filling distribution coefficient of the mixer at the current moment.

[0039] It should be noted that there are many methods for measuring the degree of discreteness of a set of data. In this embodiment, the degree of discreteness of all the speed data of the mixer in the last time period before the current moment is measured by calculating the variance of all the speed data of the mixer in the last time period before the current moment. The degree of discreteness of all the speed data of the mixer in the preset time length before the current moment is measured by calculating the variance of all the speed data of the mixer in the preset time length. The implementer may also use other methods such as dispersion coefficient or standard deviation to measure the degree of discreteness of this set of data. This embodiment does not impose any special restrictions on the selection of methods for measuring the degree of discreteness of a set of data.

[0040] In addition, it should be understood that there are many methods to measure the average level of a set of data. In this embodiment, the average level of all the speed data of the mixer is measured by calculating the mean of all the speed data of the mixer within a preset time period before the current moment. The implementer may also use other methods to measure the average level of data, such as the geometric mean. Regarding the selection of the method to measure the average level of a set of data, this embodiment does not impose any special restrictions.

[0041] Preferably, the schematic diagram of the filling distribution coefficient acquisition process provided in this embodiment is as follows: Figure 2 shown.

[0042] Further, according to the filling distribution coefficient of the mixer, it can be understood that when the filling rate is small, the speed of the mixer agitator is large, that is, the average level of all speed data of the mixer within the preset time length is larger; and the density of the mixed material has a greater influence on the speed of the agitator. During the mixing process of the mixed material, the speed fluctuation of the agitator is large, and the second discrete degree of the mixer is larger; at the same time, when the filling rate is small, the final mixing uniformity of the mixed material is poor, so that the speed data of the last time period is still large, that is, the first discrete degree of the mixer is large; conversely, when the filling rate is large, the speed of the mixer agitator is small, that is, the average level of all speed data of the mixer within the preset time length is smaller; and the density of the mixed material has a smaller influence on the speed of the agitator. During the mixing process of the mixed material, the speed fluctuation of the agitator is small, and the second discrete degree of the mixer is smaller; at the same time, when the filling rate is large, the final mixing uniformity of the mixed material is good, so that the speed data of the last time period is still small, that is, the first discrete degree of the mixer is small.

[0043] (4) Further, based on the filling rate difference coefficient and the filling distribution coefficient, the filling rate deviation coefficient of the mixer is determined, specifically: The expression of the filling rate deviation coefficient B of the mixer is: ; In the formula, represents the filling distribution coefficient of the mixer; exp( ) represents an exponential function with a natural constant as the base.

[0044] Further, according to the filling rate deviation coefficient of the mixer, it can be understood that when the filling rate is larger or smaller, the filling rate difference coefficient will be larger, so when the filling rate is smaller, the filling rate deviation coefficient is larger; when the filling rate is larger, the filling rate deviation coefficient is larger; so when the filling rate is larger, the larger the filling distribution coefficient and the larger the filling rate difference coefficient, the larger the filling rate deviation coefficient; conversely, when the filling rate is smaller, the smaller the filling distribution coefficient and the smaller the filling rate difference coefficient, the smaller the filling rate deviation coefficient.

[0045] Preferably, the schematic diagram of the filling rate deviation coefficient extraction process provided in this embodiment is as follows: Figure 3 shown.

[0046] Step S4: repeatedly obtain the filling mass and filling volume of the mixed material in the mixer, and determine the first and second fitting functions of the mixer in combination with the filling rate offset coefficient; based on the first and second fitting functions and the filling rate offset coefficient, determine the filling mass adjustment amount of the mixer at the current moment to control the mixed material in the mixer.

[0047] (1) When the components of the mixed materials in the mixer are the same, record the different filling masses and corresponding filling volumes of the mixed materials, collect the filling masses and filling volumes once, and calculate the filling rate deviation coefficient of the mixer at the corresponding collection according to the method for obtaining the filling rate deviation coefficient of the mixer at the current moment in steps S1-S3; Further, the ratio of the filling mass and the filling volume of the mixed material collected each time is taken as the filling density of the mixed material collected each time; Under all acquisitions, obtain the minimum value of the filling rate offset coefficients under all acquisitions corresponding to each filling density, and use the filling mass of the mixed material under the acquisition corresponding to the minimum value as the optimal filling mass of the filling density (Note: Although the filling mass and filling volume are different, the calculated filling density may be the same. If the filling density is the same, obtain the minimum value of the filling rate offset coefficients under all acquisitions corresponding to the filling density, and use the filling mass of the mixed material under the acquisition corresponding to the minimum value as the optimal filling mass of the filling density; if the filling densities are different, each filling density corresponds to a filling rate offset coefficient and a filling mass, and the filling mass is the optimal filling mass); All filling densities and their respective optimal filling masses are used as independent variables and dependent variables of the fitting algorithm, and a fitting function between the filling density and the optimal filling mass is output as a first fitting function; It should be noted that there are many commonly used fitting algorithms. In this embodiment, the acquisition of the fitting function adopts a nonlinear least squares fitting algorithm. The implementer may also use other fitting methods such as polynomial fitting. This embodiment does not impose any special restrictions on the selection of the fitting algorithm.

[0048] Among them, the nonlinear least square fitting algorithm is a well-known technology, and its specific fitting process will not be described in detail.

[0049] Preferably, the first fitting function schematic diagram provided in this embodiment is as follows Figure 4 As shown, Figure 4 The horizontal axis represents the packing density in units of ; The ordinate is the optimal filling quality, in units of ; Figure 4 The solid line in the figure represents the fitted curve, and the dots represent the original data.

[0050] (2) When the filling mass of the mixed materials in the mixer is the same, obtain the filling volume of the mixed materials when the types of mixed materials are different, and calculate the filling density; The filling rate deviation coefficients and respective filling densities of the mixers collected at all times are used as the independent variable and dependent variable of the fitting algorithm, and a fitting function between the filling rate deviation coefficient and the filling density is output as the second fitting function.

[0051] It should be noted that this embodiment adopts the method of controlling variables. First, the types of components of the mixed material are controlled to be the same, and the filling mass is changed, so as to analyze the relationship between the filling density and the optimal filling mass to obtain the first fitting function. Secondly, the types of components of the mixed material are controlled to be different, but the filling mass is the same, so as to analyze the relationship between the filling density and the filling rate deviation index to obtain the second fitting function. The first and second fitting functions are combined to obtain the relationship between the filling rate deviation coefficient and the optimal filling mass. If the types of components and the filling mass of the mixed material are changed at the same time, it is possible that the types of components of the mixed material are different, but the filling mass is the same, and thus the filling mass and the types of components of the mixed material cannot be matched. Therefore, the situation where the types of components and the filling mass of the mixed material are changed at the same time is not considered.

[0052] Preferably, the second fitting function schematic diagram provided in this embodiment is as follows Figure 5 As shown, Figure 5 The horizontal axis represents the filling rate deviation coefficient, which has no unit; the vertical axis represents the filling density, which has a unit of ; Figure 5 The solid line represents the fitting curve, and the dots represent the original data.

[0053] (3) Based on the first and second fitting functions and the filling rate offset coefficient, determine the filling mass adjustment amount of the mixer at the current moment, specifically: The filling mass adjustment amount of the mixer at the current moment The expression is: ; In the formula, Indicates the filling rate deviation coefficient of the mixer at the current moment; represents the first fitting function of the mixer at the current moment; represents the second fitting function of the mixer at the current moment; M represents the preset filling quality.

[0054] If the filling mass adjustment amount W of the mixer at the current moment is a negative number, the discharge port of the mixer is opened to discharge the mixed material with the filling mass adjustment amount W; if the filling mass adjustment amount W of the mixer at the current moment is a positive number, the feed port of the mixer is opened to inject the mixed material with the filling mass adjustment amount W; if the filling mass adjustment amount W of the mixer at the current moment is 0, the mixed material is neither discharged nor injected.

[0055] It should be noted that the value of the preset filling mass M is artificially set. In this embodiment, the preset filling mass is 2000 kg. The implementer can also set it by himself according to the specific situation. This embodiment does not impose any special restrictions.

[0056] At this point, this embodiment monitors the mixed materials in the mixer in real time and adjusts the filling rate of the mixer in a timely and accurate manner, avoiding the impact of low filling rate control accuracy caused by using a fixed filling rate threshold, thereby improving the accuracy of filling rate control and enhancing the mixing uniformity of the filling materials, which in turn helps to improve the quality of subsequent product production.

[0057] Based on the same inventive concept as the above method, an embodiment of the present application also provides a mixer, including a memory, a processor, and a computer program stored in the memory and running on the processor, and when the processor executes the computer program, the steps of any one of the above-mentioned methods for automatic control of the filling rate of a mixer are implemented.

[0058] It should be noted that the above sequence of the embodiments of the present application is for description only and does not represent the advantages and disadvantages of the embodiments. The above is a description of a specific embodiment of this specification. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0059] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0060] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for automatically controlling the filling rate of a mixer, characterized in that: The method comprises the following steps: Obtain the rotation speed data of the mixer at all sampling moments within a preset time period before the current moment, and the vibration data of the mixer at all sampling moments in all directions; Divide the preset time into multiple time periods, and determine the vibration measurement value of the mixer at the current moment based on the discrete degree of all vibration data in each direction of the mixer in each time period; determine the difference degree of the mixer in each time period based on the difference of all vibration data between any two directions of the mixer in each time period, and determine the filling rate difference coefficient of the mixer at the current moment in combination with the vibration measurement value; Based on the discreteness of all the rotation speed data of the mixer in the last period before the current moment, and the discreteness and average distribution of all the rotation speed data of the mixer in the preset time, determine the filling distribution coefficient of the mixer at the current moment, and combine the filling rate difference coefficient to determine the filling rate deviation coefficient of the mixer at the current moment; The filling mass and filling volume of the mixed material in the mixer are obtained multiple times, and the first and second fitting functions of the mixer are determined in combination with the filling rate offset coefficient; based on the first and second fitting functions and the filling rate offset coefficient, the filling mass adjustment amount of the mixer at the current moment is determined to control the mixed material in the mixer.

2. A method for automatically controlling the filling rate of a mixer as claimed in claim 1, characterized in that: The method for determining the vibration measurement value of the mixer at the current moment is: Calculating the variance of all vibration data in all directions of the mixer in each time period, fitting the variance of the vibration data in all directions of the mixer in all time periods, and obtaining a fitting straight line in all directions of the mixer; The vibration measurement value of the mixer at the current moment is the average level of the slope of the fitting line in all directions of the mixer.

3. A method for automatically controlling the filling rate of a mixer as claimed in claim 1, characterized in that: The method for determining the difference of the mixer in each time period is as follows: Calculate the difference of all vibration data between any two directions of the mixer in each period, and record it as the difference value between any two directions of the mixer in each period; The difference degree of the mixer in each period is the mean of the difference values ​​between all two-direction combinations of the mixer in each period.

4. A method for automatically controlling the filling rate of a mixer as claimed in claim 1, characterized in that: The expression of the filling rate difference coefficient of the mixer at the current moment is: ; In the formula, A represents the filling rate difference coefficient of the mixer at the current moment; Indicates the vibration measurement value of the mixer at the current moment; Indicates the difference between the mixers in the last period before the current moment; It indicates the difference between the mixers in time period i before the current moment; represents the difference of the mixer in the time period i+1 before the current moment; n represents the number of all time periods within the preset time length before the current moment.

5. A method for automatically controlling the filling rate of a mixer as claimed in claim 1, characterized in that: The method for determining the filling distribution coefficient of the mixer at the current moment is: Record the discrete degree of all the rotation speed data of the mixer in the last period before the current moment as the first discrete degree of the mixer at the current moment; Record the discrete degree of all the rotation speed data of the mixer within a preset time period before the current moment as the second discrete degree of the mixer at the current moment; The product of the average level of all the rotation speed data of the mixer within a preset time before the current moment and the second discrete degree is calculated, and the ratio of the first discrete degree to the product is used as the filling distribution coefficient of the mixer at the current moment.

6. A method for automatically controlling the filling rate of a mixer as claimed in claim 4, characterized in that: The expression of the filling rate deviation coefficient of the mixer at the current moment is: ; In the formula, Indicates the filling rate deviation coefficient of the mixer at the current moment; It represents the filling distribution coefficient of the mixer at the current moment; exp( ) represents an exponential function with a natural constant as the base.

7. A method for automatically controlling the filling rate of a mixer as claimed in claim 1, characterized in that: The method for determining the first and second fitting functions of the mixer at the current moment is: When the components of the mixed materials in the mixer are the same, record the different filling masses and corresponding filling volumes of the mixed materials, collect the filling mass and filling volume each time, and calculate the filling rate deviation coefficient of the mixer under the corresponding collection according to the method for obtaining the filling rate deviation coefficient of the mixer at the current moment; The ratio of the filling mass and the filling volume of the mixed material collected each time is taken as the filling density of the mixed material collected each time; Under all acquisitions, the minimum value of the filling rate deviation coefficient under all acquisitions corresponding to each filling density is obtained, and the filling mass of the mixed material under the acquisition corresponding to the minimum value is taken as the optimal filling mass of the filling density; All filling densities and their respective optimal filling masses are used as independent variables and dependent variables of the fitting algorithm, and a fitting function between the filling density and the optimal filling mass is output as a first fitting function; When the filling mass of the mixed materials in the mixer is the same, the filling volume of the mixed materials when the types of the mixed materials are different is obtained, and the filling density is calculated; The filling rate deviation coefficients and respective filling densities of the mixers collected at all times are used as the independent variable and dependent variable of the fitting algorithm, and a fitting function between the filling rate deviation coefficient and the filling density is output as the second fitting function.

8. A method for automatically controlling the filling rate of a mixer as claimed in claim 1, characterized in that: The expression of the filling mass adjustment amount of the mixer at the current moment is: ; In the formula, Indicates the filling mass adjustment amount of the mixer at the current moment; Indicates the filling rate deviation coefficient of the mixer at the current moment; represents the first fitting function of the mixer at the current moment; represents the second fitting function of the mixer at the current moment; M represents the preset filling quality.

9. A method for automatically controlling the filling rate of a mixer as claimed in claim 1, characterized in that: The control of the mixed material in the mixer comprises: If the filling mass adjustment amount of the mixer at the current moment is a negative number, the discharge port of the mixer is opened to discharge the mixed material of the filling mass adjustment amount; if the filling mass adjustment amount of the mixer at the current moment is a positive number, the feed port of the mixer is opened to inject the mixed material of the filling mass adjustment amount.

10. A mixer, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of the automatic control method of the filling rate of a mixer as described in any one of claims 1 to 9 are implemented.

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