A method and system for detecting particle size uniformity of BPE masterbatch

Abstract

The present invention relates to the field of data processing technology, and specifically to a BPE masterbatch particle size uniformity detection method and system, including: obtaining basic information of a particle size uniformity detection device and a tray mass and a screen grayscale image in each aperture adjustment experiment; calculating the mass of the dropped masterbatch according to the tray mass, and further obtaining the mass increase degree; calculating the adjusted particle size increase degree; obtaining the partition pulling distance according to the adjusted particle size increase degree and the aperture of the screen mesh; further calculating the gear rotation angle; analyzing the masterbatch area of ​​the screen grayscale image; iteratively adjusting the screening aperture length until the masterbatch screening is completed; further determining the corrected screening aperture length; drawing an aperture adjustment experiment scatter curve to obtain the masterbatch determination result. The present invention improves the accuracy of the masterbatch particle size uniformity detection result by analyzing the tray mass and the screen grayscale image in each aperture adjustment experiment.

Description

Technical Field

[0001] The invention relates to the technical field of data processing, and in particular to a method and system for detecting particle size uniformity of BPE masterbatch. Background Art

[0002] BPE masterbatch is a common plastic masterbatch, mainly used to provide specific color effects and improve the performance of plastic products. The uniformity of masterbatch particle size affects the quality and performance of plastic products, as well as the processing efficiency of plastic products, so the uniformity detection of masterbatch particle size is a crucial part of the masterbatch production process.

[0003] At present, the main method for monitoring the particle size uniformity of BPE masterbatch is screening, that is, passing BPE masterbatch through a series of sieves with different aperture sizes to divide them into different particle size categories, and weighing the masterbatch on each sieve to obtain the particle size distribution of the masterbatch. However, the sieves used in the screening method are all standard sieves, and the standard particle sizes of masterbatch particles produced by different processes may be different. When the apertures of different sieves differ greatly, when there is a small difference between the aperture of the sieve and the masterbatch particle size standard, some masterbatch with smaller particle sizes may be mistakenly screened as the same category as the standard masterbatch, making the masterbatch particle size uniformity test result inaccurate. Summary of the invention

[0004] The invention provides a method and system for detecting the particle size uniformity of BPE masterbatch to solve the existing problems.

[0005] A BPE masterbatch particle size uniformity detection method and system of the present invention adopts the following technical solutions:

[0006] An embodiment of the present invention provides a method for detecting the uniformity of particle size of BPE masterbatch, the method comprising the following steps:

[0007] Obtain the radius of the gear of the particle size uniformity detection device, the aperture of the screen mesh, the initial screening aperture length, and the mass of the tray and the grayscale image of the screen in each aperture adjustment experiment;

[0008] According to the mass of the tray in each aperture adjustment experiment, the mass of the masterbatch dropped in each aperture adjustment experiment is obtained; according to the mass of the masterbatch dropped in each aperture adjustment experiment, several reference masses of the masterbatch dropped in each aperture adjustment experiment are obtained; according to the difference between the mass of the masterbatch dropped in each aperture adjustment experiment and all the reference masses of the masterbatch dropped, the increase degree of the mass of the masterbatch dropped in each aperture adjustment experiment is obtained;

[0009] According to the mass of the dropped masterbatch and the increase degree of the dropped masterbatch mass in each aperture adjustment experiment, the increase degree of the adjusted particle size in each aperture adjustment experiment is obtained; according to the increase degree of the adjusted particle size in each aperture adjustment experiment and the aperture of the sieve mesh, the partition pulling distance in each aperture adjustment experiment is obtained; according to the partition pulling distance in each aperture adjustment experiment and the radius of the gear of the particle size uniformity detection device, the gear rotation angle in each aperture adjustment experiment is obtained; a number of masterbatch areas of the sieve grayscale image of each aperture adjustment experiment are obtained; according to the gear rotation angle of each aperture adjustment experiment, the screening aperture length is iteratively adjusted to obtain the mass of the tray in each subsequent aperture adjustment experiment, until there is no masterbatch area in the sieve grayscale image;

[0010] According to the partition pulling distance and the initial screening aperture length of each aperture adjustment experiment, the corrected screening aperture length of each aperture adjustment experiment is obtained; according to the corrected screening aperture length and the mass of dropped masterbatch of each aperture adjustment experiment, the aperture adjustment experiment scatter curve is drawn; according to the differences of all points on the aperture adjustment experiment scatter curve, the determination result of the masterbatch is obtained.

[0011] Furthermore, the method of obtaining the mass of the dropped masterbatch in each aperture adjustment experiment according to the mass of the tray in each aperture adjustment experiment includes the following specific steps:

[0012] The first Second and The absolute value of the difference in the mass of the tray in the aperture adjustment experiment is recorded as The mass of masterbatch dropped during the aperture adjustment experiment.

[0013] Furthermore, the method of obtaining several reference dropped masterbatch masses for each aperture adjustment experiment according to the dropped masterbatch mass for each aperture adjustment experiment includes the following specific steps:

[0014] The first Before the aperture adjustment experiment The mass of masterbatch dropped in the aperture adjustment experiment is recorded as The reference dropped masterbatch mass of the aperture adjustment experiment; is the preset experiment number threshold.

[0015] Further, the method of obtaining the increase degree of the mass of the dropped masterbatch in each aperture adjustment experiment according to the difference between the mass of the dropped masterbatch in each aperture adjustment experiment and the mass of all reference dropped masterbatch comprises the following specific steps:

[0016] The first The sum of the absolute values ​​of the difference between the mass of the dropped masterbatch in the aperture adjustment experiment and the mass of all the reference dropped masterbatch is recorded as The increase in the mass of the dropped masterbatch in the aperture adjustment experiment.

[0017] Further, the degree of increase in the adjusted particle size of each aperture adjustment experiment is obtained according to the mass of the dropped masterbatch and the degree of increase in the mass of the dropped masterbatch in each aperture adjustment experiment, and the specific steps include the following:

[0018] The first The normalized value of the reciprocal of the product of the mass of the dropped masterbatch and the increase in the mass of the dropped masterbatch in the first aperture adjustment experiment is recorded as The degree of particle size increase in the secondary pore size adjustment experiment.

[0019] Furthermore, the step of obtaining the partition pulling distance of each aperture adjustment experiment according to the increase degree of the adjusted particle size and the aperture of the sieve mesh in each aperture adjustment experiment includes the following specific steps:

[0020] The first The product of the increase in the adjusted particle size in the first aperture adjustment experiment and the aperture of the sieve mesh is recorded as The diaphragm pulling distance for the secondary aperture adjustment experiment.

[0021] Furthermore, the gear rotation angle of each aperture adjustment experiment is obtained according to the pulling distance of the partition in each aperture adjustment experiment and the radius of the gear of the particle size uniformity detection device, and the specific steps include the following:

[0022] The first The ratio of the partition pulling distance in the aperture adjustment experiment to the radius of the gear of the particle size uniformity detection device is recorded as Gear rotation angle for sub-aperture adjustment experiment.

[0023] Furthermore, the modified screening aperture length of each aperture adjustment experiment is obtained according to the partition pulling distance of each aperture adjustment experiment and the initial screening aperture length, and the specific steps include the following:

[0024] The first The sum of the partition pulling distance of the aperture adjustment experiment and all the previous aperture adjustment experiments and the initial screening aperture length is recorded as Corrected sieve aperture length for secondary aperture adjustment experiments.

[0025] Furthermore, the determination result of the masterbatch is obtained by adjusting the difference of all points on the scatter curve of the pore size adjustment experiment, and the specific steps include the following:

[0026] In the scatter curve of the aperture adjustment experiment, any The points with equal intervals between horizontal coordinates are recorded as reference points; among them, is a preset quantity threshold;

[0027] The linear normalized value of the reciprocal of the standard deviation of the ordinates of all reference points is recorded as the masterbatch particle size uniformity;

[0028] If the masterbatch particle size uniformity is greater than or equal to the preset first threshold, the detected masterbatch particle size uniformity is determined to be good; if the masterbatch particle size uniformity is less than the preset first threshold, the detected masterbatch particle size uniformity is determined to be poor.

[0029] The present invention also proposes a BPE masterbatch particle size uniformity detection system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program stored in the memory to implement the steps of the aforementioned BPE masterbatch particle size uniformity detection method.

[0030] The beneficial effects of the technical solution of the present invention are:

[0031] The radius of the gear of the particle size uniformity detection device, the aperture of the screen mesh, the initial screening aperture length, and the mass of the tray and the grayscale image of the screen in each aperture adjustment experiment are obtained, which provides basic data for subsequent aperture adjustment experiments and improves the accuracy of detection. According to the mass of the tray in each aperture adjustment experiment, the mass of the dropped masterbatch in each aperture adjustment experiment is obtained, which accurately reflects the dropping of the masterbatch in each aperture adjustment experiment. According to the mass of the dropped masterbatch in each aperture adjustment experiment, several reference masses of dropped masterbatch in each aperture adjustment experiment are obtained, which improves the accuracy of the subsequent calculation of the increase in the mass of the dropped masterbatch. According to the difference between the mass of the dropped masterbatch in each aperture adjustment experiment and all the reference masses of the dropped masterbatch, the increase in the mass of the dropped masterbatch in each aperture adjustment experiment is obtained, which further improves the accuracy and reliability of data analysis.

[0032] According to the mass of the dropped masterbatch and the increase in the mass of the dropped masterbatch in each aperture adjustment experiment, the increase in the adjusted particle size in each aperture adjustment experiment is obtained to ensure the accuracy of the masterbatch screening. According to the increase in the adjusted particle size in each aperture adjustment experiment and the aperture of the sieve mesh, the partition pulling distance in each aperture adjustment experiment is obtained; according to the partition pulling distance in each aperture adjustment experiment and the radius of the gear of the particle size uniformity detection device, the gear rotation angle in each aperture adjustment experiment is obtained, so that the screening aperture length can be dynamically adjusted to achieve high-precision screening. Obtain several masterbatch areas of the sieve grayscale image of each aperture adjustment experiment; according to the gear rotation angle of each aperture adjustment experiment, iteratively adjust the screening aperture length to obtain the mass of the tray in each subsequent aperture adjustment experiment, until there is no masterbatch area in the sieve grayscale image, ensuring the accuracy of the screening results. According to the partition pulling distance and the initial screening aperture length of each aperture adjustment experiment, the corrected screening aperture length of each aperture adjustment experiment is obtained, and the corrected screening aperture length of each aperture adjustment experiment is accurately obtained. According to the corrected screening aperture length and the mass of the dropped masterbatch of each aperture adjustment experiment, the aperture adjustment experiment scatter curve is drawn to improve the accuracy of the subsequent judgment results. According to the difference of all points on the aperture adjustment experiment scatter curve, the judgment result of the masterbatch is obtained. The present invention improves the accuracy of the masterbatch particle size uniformity detection result by analyzing the tray mass and the screen grayscale image in each aperture adjustment experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A flow chart of the steps of a method for detecting particle size uniformity of BPE masterbatch according to the present invention;

[0035] Figure 2 Schematic diagram of a masterbatch particle size uniformity detection device provided in this embodiment;

[0036] Figure 3 A schematic diagram of the screen and partition provided in this embodiment;

[0037] Figure 4 A schematic diagram of the gears of the masterbatch particle size uniformity detection device provided in this embodiment;

[0038] Figure 5 This is a schematic diagram of a scatter curve of the aperture adjustment experiment provided in this embodiment. DETAILED DESCRIPTION

[0039] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of a BPE masterbatch particle size uniformity detection method and system proposed by the present invention, its specific implementation, structure, characteristics and effects, in conjunction 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.

[0040] 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 invention belongs.

[0041] The specific scheme of a BPE masterbatch particle size uniformity detection method and system provided by the present invention is described in detail below with reference to the accompanying drawings.

[0042] See also Figure 1 , which shows a flow chart of the steps of a method for detecting the particle size uniformity of BPE masterbatch provided by an embodiment of the present invention, the method comprising the following steps:

[0043] Step S001: Obtain the radius of the gear of the particle size uniformity detection device, the aperture of the screen mesh, the initial screening aperture length, and the mass of the tray and the grayscale image of the screen in each aperture adjustment experiment.

[0044] It should be noted that the masterbatch particle size uniformity detection device mainly includes screening, monitoring and adjustment parts. Figure 2 Schematic diagram of the masterbatch particle size uniformity detection device provided in this embodiment. Figure 2 In the process, the camera is used to monitor the remaining masterbatch during the inspection process, the partition and screen aperture adjustment device is used to adjust the aperture size during screening, the pressure sensor installed on the tray is used to measure the mass of the dropped masterbatch, and the vibration device is used to vibrate the screen part during the inspection process so that the masterbatch can quickly fall into the tray. The aperture of the partition mesh is consistent with that of the screen mesh, and the interval size of each column is also consistent, and the interval of each column must be greater than or equal to the aperture size. The overlapping part of the screen mesh and the partition mesh is the position where the masterbatch can fall. By pulling the partition to the left, the overlapping part of the screen mesh and the partition mesh is increased, thereby increasing the aperture size during screening. Such as Figure 3 The figure is a schematic diagram of the screen and the partition provided in this embodiment. The position of the gear of the masterbatch particle size uniformity detection device is fixed, and the rack is connected to the partition. When the partition needs to be pulled to adjust the aperture size, the gear is turned to drive the rack to move, thereby realizing the automatic adjustment of the partition position. Figure 4 Schematic diagram of the gears of the masterbatch particle size uniformity detection device provided in this embodiment.

[0045] The overlapping length of the mesh of the screen and the mesh of the partition is recorded as the screening aperture length. Figure 3 The lateral length of the middle of the overlapping part between each screen mesh and the partition mesh.

[0046] Place the masterbatch to be tested into the particle size uniformity detection device and monitor the mass in the tray once per second. The mass of the tray remains constant during each aperture adjustment experiment. At 1 second, record the mass of the current tray, use a camera to shoot the screen, perform grayscale processing on the shot image, obtain the screen grayscale image of each aperture adjustment experiment, and obtain the radius of the gear of the particle size uniformity detection device, the aperture of the screen mesh, and the initial screening aperture length. is a preset time threshold. The preset time threshold in this embodiment is The value is 5, and this is used as an example for description.

[0047] It should be noted that when no masterbatch is placed in the tray, the mass of the tray is 0.

[0048] It is further necessary to explain that in order to screen out masterbatches of different particle sizes and avoid masterbatches with large particle size differences being screened into the same category, the initial screening aperture length cannot be set too large. However, if the initial screening aperture length is set too small, it may lead to the failure to screen out masterbatches in the early stage, affecting the detection efficiency. Since the particle size of masterbatches is usually larger than 0.1mm, the initial screening aperture length is 0.1mm.

[0049] Step S002: according to the mass of the tray in each aperture adjustment experiment, the mass of the masterbatch dropped in each aperture adjustment experiment is obtained; according to the mass of the masterbatch dropped in each aperture adjustment experiment, several reference masses of the masterbatch dropped in each aperture adjustment experiment are obtained; according to the difference between the mass of the masterbatch dropped in each aperture adjustment experiment and all the reference masses of the masterbatch dropped, the degree of increase in the mass of the masterbatch dropped in each aperture adjustment experiment is obtained.

[0050] When the screening aperture length is much smaller than the average particle size of the masterbatch, the increase in the screening aperture length should be relatively large in order to improve the detection efficiency. If the screening aperture length is close to the normal masterbatch particle size, in order to avoid screening non-standard masterbatch into normal masterbatch, the increase in the screening aperture length should be reduced. Since the particle sizes of non-standard masterbatch are usually quite different and the number is small, the greater the difference between the screening aperture length and the normal masterbatch particle size, the fewer masterbatch will be screened. When the screening aperture length is close to the normal masterbatch particle size, the number of masterbatch that falls will increase. Therefore, the adjustment of the particle size increase is calculated based on the mass of the masterbatch that falls at each screening aperture length and the degree of increase relative to the previous falling process.

[0051] First For example, the aperture adjustment experiment The specific calculation formula corresponding to the mass of the dropped masterbatch in the aperture adjustment experiment is:

[0052] ;

[0053] in, Indicates The mass of masterbatch dropped in the aperture adjustment experiment; Indicates The mass of the tray in the subaperture adjustment experiment; Indicates The mass of the tray in the subaperture adjustment experiment; represents the absolute value function.

[0054] What needs to be explained is: and Proportional, The larger the value of The more times the aperture adjustment experiment is conducted, the greater the mass of the masterbatch that falls off.

[0055] It is further necessary to explain that when calculating the mass of the masterbatch dropped in the first aperture adjustment experiment, is the mass of the tray when no masterbatch is placed in the tray, that is, 0; the sieving aperture length of the first aperture adjustment experiment is the initial sieving aperture length.

[0056] Through the above process, we get The mass of masterbatch dropped during the aperture adjustment experiment.

[0057] Each aperture adjustment experiment is calculated according to the above process to obtain the mass of the masterbatch dropped in each aperture adjustment experiment.

[0058] The first Before the aperture adjustment experiment The mass of masterbatch dropped in the aperture adjustment experiment is recorded as The reference drop masterbatch mass of the aperture adjustment experiment. is the preset experiment number threshold. The value is 5, and this is used as an example for description.

[0059] It should be noted that if the number of aperture adjustment experiments before the i-th aperture adjustment experiment is less than 5, no analysis will be performed.

[0060] Through the above process, several reference dropped masterbatch masses of each aperture adjustment experiment are obtained.

[0061] The first The specific calculation formula corresponding to the increase in the mass of the dropped masterbatch in the aperture adjustment experiment is:

[0062] ;

[0063] in, Indicates The degree of increase in the mass of dropped masterbatch in the secondary aperture adjustment experiment; Indicates The amount of reference masterbatch mass dropped in the secondary aperture adjustment experiment; Indicates The mass of masterbatch dropped in the aperture adjustment experiment; Indicates The first aperture adjustment experiment Reference dropped masterbatch mass; represents the absolute value function.

[0064] What needs to be explained is: and Proportional, The larger the value of The greater the increase in the mass of the dropped masterbatch in the aperture adjustment experiment, the greater the increase in the mass of the dropped masterbatch.

[0065] It should be noted that: The aperture adjustment experiment should be the sixth aperture adjustment experiment, in which 5 aperture adjustments were performed, and the gear rotation angles during the 5 aperture adjustments were the same, all of which were preset angles. Among them, the preset angle in this embodiment is 2, which is used as an example for description.

[0066] Through the above process, we obtain The degree of increase in the mass of dropped masterbatch in the secondary aperture adjustment experiment;

[0067] Each aperture adjustment experiment is calculated according to the above process to obtain the increase in the mass of the dropped masterbatch in each aperture adjustment experiment.

[0068] Step S003: According to the mass of the dropped masterbatch and the increase degree of the mass of the dropped masterbatch in each aperture adjustment experiment, the increase degree of the adjusted particle size in each aperture adjustment experiment is obtained; according to the increase degree of the adjusted particle size in each aperture adjustment experiment and the aperture of the screen mesh, the partition pulling distance in each aperture adjustment experiment is obtained; according to the partition pulling distance in each aperture adjustment experiment and the radius of the gear of the particle size uniformity detection device, the gear rotation angle in each aperture adjustment experiment is obtained; several masterbatch areas of the screen grayscale image in each aperture adjustment experiment are obtained; according to the gear rotation angle in each aperture adjustment experiment, the screening aperture length is iteratively adjusted to obtain the mass of the tray in each subsequent aperture adjustment experiment, until there is no masterbatch area in the screen grayscale image.

[0069] It should be noted that: according to the mass of the dropped masterbatch and the increase in the mass of the dropped masterbatch, the degree to which the sieve aperture length needs to be increased after each aperture adjustment experiment is reflected. Among them, the greater the mass of the dropped masterbatch in the aperture adjustment experiment, the smaller the degree to which the sieve aperture length needs to be increased, and the greater the increase in the mass of the dropped masterbatch, the smaller the degree to which the sieve aperture length needs to be increased.

[0070] First For example, the aperture adjustment experiment The specific calculation formula corresponding to the increase in the adjusted particle size in the secondary pore size adjustment experiment is:

[0071] ;

[0072] in, Indicates The degree of increase in the adjusted particle size in the secondary aperture adjustment experiment; Indicates The mass of masterbatch dropped in the aperture adjustment experiment; Indicates The degree of increase in the mass of dropped masterbatch in the secondary aperture adjustment experiment; represents the linear normalization function.

[0073] What needs to be explained is: and Inversely proportional, The larger the value of The smaller the increase in the adjusted particle size in the secondary aperture adjustment experiment; and Inversely proportional, The larger the value of The smaller the increase in particle size in the secondary pore size adjustment experiment.

[0074] Through the above process, we obtained The degree of particle size increase in the secondary pore size adjustment experiment.

[0075] Each pore size adjustment experiment is calculated according to the above process to obtain the increase degree of the adjusted particle size in each pore size adjustment experiment.

[0076] The first The product of the increase in the adjusted particle size in the first aperture adjustment experiment and the aperture of the sieve mesh is recorded as The diaphragm pulling distance for the secondary aperture adjustment experiment.

[0077] Through the above process, the partition pulling distance of each aperture adjustment experiment was obtained.

[0078] It should be noted that: since the distance that the gear needs to drive the rack to move is the arc length that the edge of the gear needs to move on the chain, the angle that the gear in the adjusting device needs to rotate is calculated according to the sector angle calculation formula.

[0079] The first The ratio of the partition pulling distance in the aperture adjustment experiment to the radius of the gear of the particle size uniformity detection device is recorded as Gear rotation angle for sub-aperture adjustment experiment.

[0080] Through the above process, the gear rotation angle of each aperture adjustment experiment is obtained.

[0081] The global threshold method is used to calculate the screen grayscale image of each aperture adjustment experiment to obtain several masterbatch regions of the screen grayscale image of each aperture adjustment experiment. The global threshold method is a well-known technology and the specific method is not introduced here.

[0082] It should be noted that the grayscale values ​​of the pixels of the masterbatch and the sieve are quite different and relatively simple, so the global threshold method is directly used to segment the masterbatch.

[0083] According to The gear rotation angle of the aperture adjustment experiment is The sieve aperture length of the first aperture adjustment experiment was adjusted to obtain the The mass of the tray in the secondary aperture adjustment experiment; if the If there is no masterbatch area in the screen grayscale image of the aperture adjustment experiment, the aperture adjustment experiment is terminated; In the grayscale image of the sieve in the aperture adjustment experiment, there is a masterbatch area. The gear rotation angle of the aperture adjustment experiment is obtained by the method of obtaining the gear rotation angle of the next aperture adjustment experiment, and it is iterated in sequence until there is no masterbatch area in the screen grayscale image of any aperture adjustment experiment.

[0084] Step S004: Obtain the corrected screening aperture length for each aperture adjustment experiment based on the partition pulling distance and the initial screening aperture length of each aperture adjustment experiment; draw the aperture adjustment experiment scatter curve based on the corrected screening aperture length and the mass of the dropped masterbatch of each aperture adjustment experiment; obtain the determination result of the masterbatch based on the differences among all points on the aperture adjustment experiment scatter curve.

[0085] It should be noted that the relationship curve between the sieve aperture length and the mass of the dropped masterbatch in all aperture adjustment experiments should basically satisfy the normal distribution. On this basis, if the width of the curve is smaller, it means that the masterbatch particle size is more concentrated in a smaller range, that is, the masterbatch particle size is more uniform.

[0086] Still As an example, take the aperture adjustment experiment as an example. The sum of the partition pulling distance of the aperture adjustment experiment and all the previous aperture adjustment experiments and the initial screening aperture length is recorded as Corrected sieve aperture length for secondary aperture adjustment experiments.

[0087] It should be noted that the partition pulling distance of all aperture adjustment experiments before the (i+1)th aperture adjustment experiment is obtained by multiplying the preset angle by the radius of the gear of the particle size uniformity detection device.

[0088] Through the above process, the corrected sieving aperture length of each aperture adjustment experiment is obtained.

[0089] The corrected sieve aperture length of each aperture adjustment experiment is used as the horizontal coordinate, and the mass of the dropped masterbatch of each aperture adjustment experiment is used as the vertical coordinate to draw a scatter plot of the aperture adjustment experiment. All points in the scatter plot of the aperture adjustment experiment are fitted using the least squares method to obtain the scatter curve of the aperture adjustment experiment. Figure 5 This is a schematic diagram of the scatter curve of the aperture adjustment experiment provided in this embodiment. Among them, the least square method is a well-known technology, and the specific method is not introduced here.

[0090] In the scatter curve of the aperture adjustment experiment, any The points with equal intervals between horizontal coordinates are recorded as reference points. is a preset quantity threshold. The preset quantity threshold in this embodiment is The value is 20, and this is used as an example for description.

[0091] It should be noted that: The points with equal intervals between the horizontal coordinates can be selected to obtain the uniformity of the particle size of multiple masterbatches, and then the judgment can be made to ensure the accuracy of the results.

[0092] The linearly normalized value of the reciprocal of the standard deviation of the ordinates of all reference points is recorded as the masterbatch particle size uniformity.

[0093] If the uniformity of the masterbatch particle size is greater than or equal to the preset first threshold, the uniformity of the masterbatch particle size detected is determined to be good; if the uniformity of the masterbatch particle size is less than the preset first threshold, the uniformity of the masterbatch particle size detected is determined to be poor. In this embodiment, the preset first threshold is 0.8, which is used as an example for description.

[0094] So far, the present invention is completed.

[0095] In summary, in the embodiment of the present invention, the basic information of the particle size uniformity detection device and the tray mass and the screen grayscale image in each aperture adjustment experiment are obtained; the mass of the dropped masterbatch is calculated according to the tray mass, and the degree of mass increase is further obtained; the degree of particle size increase is calculated; the partition pulling distance is obtained according to the degree of particle size increase and the aperture of the screen mesh; the gear rotation angle is further calculated; the masterbatch area of ​​the screen grayscale image is analyzed; the screening aperture length is iteratively adjusted until the masterbatch screening is completed; the corrected screening aperture length is further determined; the aperture adjustment experiment scatter curve is drawn to obtain the determination result of the masterbatch. The present invention improves the accuracy of the masterbatch particle size uniformity detection result by analyzing the tray mass and the screen grayscale image in each aperture adjustment experiment.

[0096] The present invention also provides a BPE masterbatch particle size uniformity detection system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program stored in the memory to implement the steps of the aforementioned BPE masterbatch particle size uniformity detection method.

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting the uniformity of particle size of BPE masterbatch, characterized in that: The method comprises the following steps: Obtain the radius of the gear of the particle size uniformity detection device, the aperture of the screen mesh, the initial screening aperture length, and the mass of the tray and the grayscale image of the screen in each aperture adjustment experiment; According to the mass of the tray in each aperture adjustment experiment, the mass of the masterbatch dropped in each aperture adjustment experiment is obtained; according to the mass of the masterbatch dropped in each aperture adjustment experiment, several reference masses of the masterbatch dropped in each aperture adjustment experiment are obtained; according to the difference between the mass of the masterbatch dropped in each aperture adjustment experiment and all the reference masses of the masterbatch dropped, the increase degree of the mass of the masterbatch dropped in each aperture adjustment experiment is obtained; According to the mass of the dropped masterbatch and the increase degree of the dropped masterbatch mass in each aperture adjustment experiment, the increase degree of the adjusted particle size in each aperture adjustment experiment is obtained; according to the increase degree of the adjusted particle size in each aperture adjustment experiment and the aperture of the sieve mesh, the partition pulling distance in each aperture adjustment experiment is obtained; according to the partition pulling distance in each aperture adjustment experiment and the radius of the gear of the particle size uniformity detection device, the gear rotation angle in each aperture adjustment experiment is obtained; a number of masterbatch areas of the sieve grayscale image of each aperture adjustment experiment are obtained; according to the gear rotation angle of each aperture adjustment experiment, the screening aperture length is iteratively adjusted to obtain the mass of the tray in each subsequent aperture adjustment experiment, until there is no masterbatch area in the sieve grayscale image; According to the partition pulling distance and the initial screening aperture length of each aperture adjustment experiment, the corrected screening aperture length of each aperture adjustment experiment is obtained; according to the corrected screening aperture length and the mass of dropped masterbatch of each aperture adjustment experiment, the aperture adjustment experiment scatter curve is drawn; according to the differences of all points on the aperture adjustment experiment scatter curve, the determination result of the masterbatch is obtained.

2. According to claim 1, a method for detecting uniformity of particle size of BPE masterbatch, characterized in that: The method of obtaining the mass of the dropped masterbatch in each aperture adjustment experiment according to the mass of the tray in each aperture adjustment experiment includes the following specific steps: The first Second and The absolute value of the difference in the mass of the tray in the aperture adjustment experiment is recorded as The mass of masterbatch dropped during the aperture adjustment experiment.

3. A method for detecting particle size uniformity of BPE masterbatch according to claim 1, characterized in that: The specific steps of obtaining a plurality of reference dropped masterbatch masses for each aperture adjustment experiment according to the dropped masterbatch mass for each aperture adjustment experiment are as follows: The first Before the aperture adjustment experiment The mass of masterbatch dropped in the aperture adjustment experiment is recorded as The reference dropped masterbatch mass of the aperture adjustment experiment; is the preset experiment number threshold.

4. A method for detecting particle size uniformity of BPE masterbatch according to claim 1, characterized in that: The step of obtaining the increase degree of the masterbatch mass dropped in each aperture adjustment experiment according to the difference between the masterbatch mass dropped in each aperture adjustment experiment and the masterbatch mass dropped in all references is as follows: The first The sum of the absolute values ​​of the difference between the mass of the dropped masterbatch in the aperture adjustment experiment and the mass of all the reference dropped masterbatch is recorded as The increase in the mass of the dropped masterbatch in the aperture adjustment experiment.

5. A method for detecting particle size uniformity of BPE masterbatch according to claim 1, characterized in that: The specific steps of obtaining the increase degree of the adjusted particle size of each aperture adjustment experiment according to the mass of the dropped masterbatch and the increase degree of the dropped masterbatch mass in each aperture adjustment experiment are as follows: The first The normalized value of the reciprocal of the product of the mass of the dropped masterbatch and the increase in the mass of the dropped masterbatch in the first aperture adjustment experiment is recorded as The degree of particle size increase in the secondary pore size adjustment experiment.

6. A method for detecting particle size uniformity of BPE masterbatch according to claim 1, characterized in that: The step of obtaining the partition pulling distance of each aperture adjustment experiment according to the increase degree of the adjusted particle size and the aperture of the sieve mesh in each aperture adjustment experiment includes the following specific steps: The first The product of the increase in the adjusted particle size in the first aperture adjustment experiment and the aperture of the sieve mesh is recorded as The diaphragm pulling distance for the secondary aperture adjustment experiment.

7. A method for detecting particle size uniformity of BPE masterbatch according to claim 1, characterized in that: The gear rotation angle of each aperture adjustment experiment is obtained according to the pulling distance of the partition in each aperture adjustment experiment and the radius of the gear of the particle size uniformity detection device, and the specific steps include the following: The first The ratio of the partition pulling distance in the aperture adjustment experiment to the radius of the gear of the particle size uniformity detection device is recorded as Gear rotation angle for sub-aperture adjustment experiment.

8. A method for detecting particle size uniformity of BPE masterbatch according to claim 1, characterized in that: The method of obtaining the corrected sieving aperture length of each aperture adjustment experiment according to the partition pulling distance of each aperture adjustment experiment and the initial sieving aperture length includes the following specific steps: The first The sum of the partition pulling distance of the aperture adjustment experiment and all the previous aperture adjustment experiments and the initial screening aperture length is recorded as Corrected sieve aperture length for secondary aperture adjustment experiments.

9. A method for detecting particle size uniformity of BPE masterbatch according to claim 1, characterized in that: The determination result of the masterbatch is obtained according to the difference of all points on the scatter curve of the aperture adjustment experiment, and the specific steps include the following: In the scatter curve of the aperture adjustment experiment, any The points with equal intervals between horizontal coordinates are recorded as reference points; among them, is a preset quantity threshold; The linear normalized value of the reciprocal of the standard deviation of the ordinates of all reference points is recorded as the masterbatch particle size uniformity; If the masterbatch particle size uniformity is greater than or equal to the preset first threshold, the detected masterbatch particle size uniformity is determined to be good; if the masterbatch particle size uniformity is less than the preset first threshold, the detected masterbatch particle size uniformity is determined to be poor.

10. A BPE masterbatch particle size uniformity detection system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the computer program is executed by a processor, the steps of a method for detecting particle size uniformity of BPE masterbatch as described in any one of claims 1 to 9 are implemented.

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