CN115008712A - Method for eliminating product bubbles in screw injection molding machine - Google Patents
Method for eliminating product bubbles in screw injection molding machine Download PDFInfo
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- CN115008712A CN115008712A CN202210946895.2A CN202210946895A CN115008712A CN 115008712 A CN115008712 A CN 115008712A CN 202210946895 A CN202210946895 A CN 202210946895A CN 115008712 A CN115008712 A CN 115008712A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
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Abstract
The invention relates to the technical field of artificial intelligence, in particular to a method for eliminating product bubbles by a screw injection molding machine. According to the method, a backpressure sequence of a screw injection molding machine, a bubble volume sequence and a defoaming power sequence in a product melt in a time period and a defoaming efficiency obtained by the bubble volume sequence and the defoaming power sequence form sample data of the time period; classifying the sample data according to the similarity among the corresponding sample data of a plurality of historical time periods, and calculating the global defoaming efficiency of the product melt according to the classified defoaming efficiency; and acquiring the volume of bubbles in the product melt at the next moment, combining the volume of the bubbles and the overall defoaming efficiency to obtain the defoaming degree, and adjusting the back pressure of the screw injection molding machine by utilizing the defoaming degree. The backpressure is adjusted in real time through the defoaming degree to avoid the generation of bubbles in the product melt, so that the sol density is enhanced, and the production quality of the product is ensured.
Description
Technical Field
The invention relates to the technical field of artificial intelligence, in particular to a method for eliminating product bubbles by a screw injection molding machine.
Background
When a screw injection molding machine produces products, air bubbles are generated inside the products due to a plurality of reasons, such as: when the raw material is fed due to reasons such as over-high screw rotation speed or addition of crushed materials with irregular particle sizes and shapes, air is involved so as to form air bubbles; when the raw material is dried and the moisture content is too high, a large amount of moisture enters the gun barrel to form steam bubbles; too high a heating temperature of the raw material or too long a residence time in the gun barrel (too long a heating time) causes the raw material to be degraded to generate gas bubbles. If a large amount of bubbles exist in the product, the product quality is seriously influenced, so that the safety risk occurs in the use process of the product, and the problem of urgently solving is to avoid the occurrence of a large amount of bubbles in the product.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for eliminating product bubbles by a screw injection molding machine, which adopts the following technical scheme:
obtaining the back pressure of the screw injection molding machine, the volume of bubbles in a product melt and the bubble removal power of a corresponding ultrasonic bubble remover at each moment based on the set sampling frequency, and further obtaining a back pressure sequence, a bubble volume sequence and a bubble removal power sequence corresponding to a set time period; calculating the bubble removal efficiency in the time period according to the bubble volume sequence and the bubble removal power sequence; forming the backpressure sequence, the bubble volume sequence, the bubble removing power sequence and the bubble removing efficiency into sample data in the time period;
obtaining sample data corresponding to the current product melt in multiple historical time periods, and classifying all the sample data according to the similarity degree among the sample data to obtain multiple categories; calculating average defoaming efficiency of corresponding categories according to the defoaming efficiency contained in each category, and taking the average value of the average defoaming efficiency as the global defoaming efficiency of the current product melt;
and acquiring the bubble volume of the current product melt at the next moment, combining the bubble volume and the global bubble removal efficiency to obtain the bubble removal degree at the next moment, and adjusting the back pressure of the screw injection molding machine according to the bubble removal degree.
Preferably, the method for calculating the bubble removal efficiency in the time period by the bubble volume sequence and the bubble removal power sequence comprises the following steps:
calculating a first standard deviation between all bubble removing powers in the bubble removing power sequence; calculating a second standard deviation of all bubble volumes in the sequence of bubble volumes; and acquiring the bubble removing efficiency in the corresponding time period by using the product of the first standard deviation and the second standard deviation and the time length of the time period.
Preferably, the method for classifying all the sample data according to the similarity degree between the sample data includes:
and obtaining the sample distance between the sample data corresponding to every two historical time periods by utilizing a Pearson correlation coefficient, and classifying all the sample data through a DBSCAN clustering algorithm based on the sample distance.
Preferably, the bubble removal degree is obtained by multiplying the bubble volume by the global bubble removal efficiency.
Preferably, the method for adjusting the back pressure of the screw injection molding machine according to the defoaming degree comprises the following steps:
and obtaining the adjustment degree of the back pressure according to the defoaming degree, wherein the adjustment degree and the defoaming degree are in positive correlation.
The embodiment of the invention at least has the following beneficial effects: the backpressure is adjusted in real time through the defoaming degree to avoid the generation of bubbles in the product melt, so that the sol density is enhanced, and the production quality of the product is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions and advantages of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of the steps of a method for debubbling a product with respect to a screw injection molding machine according to one embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given of a method for eliminating product bubbles of a screw injection molding machine according to the present invention, and the specific implementation manner, structure, features and effects thereof with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
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.
The following describes a specific scheme of the method for eliminating product bubbles of the screw injection molding machine, which is provided by the invention, in detail by combining with the attached drawings.
Referring to fig. 1, a flow chart of steps of a method for de-bubbling product with respect to a screw injection molding machine according to an embodiment of the present invention is shown, the method comprising the steps of:
s001, obtaining the back pressure of the screw injection molding machine, the volume of bubbles in a product melt and the bubble removing power of a corresponding ultrasonic bubble remover at each moment based on a set sampling frequency, and further obtaining a back pressure sequence, a bubble volume sequence and a bubble removing power sequence corresponding to a set time period; calculating the bubble removal efficiency in the time period according to the bubble volume sequence and the bubble removal power sequence; and (4) forming sample data in the time period by the backpressure sequence, the bubble volume sequence, the bubble removing power sequence and the bubble removing efficiency.
Specifically, gather screw rod injection molding machine's backpressure through installing the manometer for screw rod injection molding machine, screw rod injection molding machine's backpressure means the pressure that screw rod head front end stock district melt received when the screw rod rotates the backset, also lasts injection pressure to reach and reduce the effect that the product plastic fully fills, can increase the melten gel density simultaneously, the air in the evacuation is glued. According to the embodiment of the invention, 1S is taken as a sampling frequency, and the back pressure F of the screw injection molding piece at each moment is obtained by collecting the data of a pressure gauge.
When the ultrasonic wave is transmitted in the product melt, if the ultrasonic wave meets bubbles, the front and back reflecting surfaces of the bubbles can influence the energy of ultrasonic wave reflected waves, so that the volume of the bubbles in the product melt can be obtained according to the energy change of the reflected waves, and the energy change of the reflected waves is in positive correlation with the volume of the bubbles. Similarly, with 1S as a sampling frequency, the volume V of bubbles in the melt of the product at each moment is obtained by using an ultrasonic detector.
The ultrasonic wave can generate cavitation in the liquid, the cavitation generates impact force, so that the gas dissolved in the liquid is broken and separated, a large amount of micro bubbles in the liquid are continuously condensed into spherical large bubbles, the large bubbles are separated from the liquid surface after being broken and are discharged through the exhaust port, and the purpose of degassing and defoaming of the liquid is achieved, and therefore, the bubbles in a product melt can be eliminated by using the ultrasonic wave foam remover. The sound wave oscillation frequency that the ultrasonic wave produced under different power is different, and then the sound wave oscillation frequency of difference corresponds removes the bubble effect also different, and sound wave oscillation frequency is big more, and is big more with the impact of bubble, and it is also that the bubble volume in the product melt is big more that the bubble power that removes of ultrasonic wave bubble removing device is big more, consequently can obtain the bubble power Q that removes that this moment corresponds according to the bubble volume in the product melt at every moment, and remove bubble power and bubble volume and be positive correlation.
Further, setting the sampling time period T to be three minutes, obtaining the back pressure F of the screw injection molding machine, the bubble volume V in the product melt and the corresponding bubble removal power Q at each moment in the time period T, and respectively forming a back pressure sequence, a bubble volume sequence and a bubble removal power sequence in the time period T. Meanwhile, the bubble removal efficiency S of the time period T is obtained by combining the bubble volume sequence and the bubble removal power sequence in the time period T, and then the calculation formula of the bubble removal efficiency is as follows:
wherein the content of the first and second substances,
the first standard deviation between all bubble removing powers in the bubble removing power sequence is obtained;
the second standard deviation of all bubble volumes in the sequence of bubble volumes.
And (3) forming sample data in a time period by using the backpressure sequence, the bubble volume sequence, the bubble removing power sequence and the bubble removing efficiency in the time period, namely enabling the time period to correspond to one sample data P.
S002, obtaining sample data corresponding to the current product melt in multiple historical time periods, and classifying all the sample data according to the similarity degree of the sample data to obtain multiple classes; and calculating the average defoaming efficiency of the corresponding category according to the defoaming efficiency contained in each category, and taking the average value of the average defoaming efficiencies as the global defoaming efficiency of the current product melt.
Specifically, the step S001 is used to obtain sample data corresponding to the current product melt in a plurality of historical time periods, calculate the similarity between the sample data, and classify all the sample data based on the similarity, wherein the classification method includes: obtaining a sample distance D between sample data corresponding to two historical time periods by using a Pearson correlation coefficient PPMCC (point-to-point correlation coefficient), namely
Wherein
Is the sample data corresponding to the historical time period a,
the sample data is corresponding to the historical time period B. Experience-based setting of clustering radius of DBSCAN clustering algorithm
Using the clustering radius based on the sample distance D
All sample data is classified to obtain a plurality of classes.
Further, an average bubble removal efficiency between the bubble removal efficiencies contained in each category is calculated
Calculating the average value of the average defoaming efficiency corresponding to all the categories,and taking the obtained average value as the global defoaming efficiency of the current product melt, wherein the global defoaming efficiency refers to the average defoaming efficiency of the current product melt in the defoaming process.
And S003, acquiring the bubble volume of the current product melt at the next moment, combining the bubble volume and the global bubble removal efficiency to obtain the bubble removal degree at the next moment, and adjusting the back pressure of the screw injection molding machine according to the bubble removal degree.
Specifically, the ultrasonic detector is used for obtaining the volume of the bubbles in the current product melt at the next moment, the global bubble removing efficiency of the bubbles and the volume of the bubbles at the moment are combined to obtain the bubble removing degree at the moment, the global bubble removing efficiency and the bubble removing degree are in positive correlation, and the volume of the bubbles and the bubble removing degree are in positive correlation.
Further, the adjusting degree of the back pressure of the screw injection molding machine is obtained according to the defoaming degree, the back pressure of the screw injection molding machine is adjusted in real time according to the adjusting degree, and the defoaming degree and the adjusting degree are in positive correlation.
In summary, the embodiment of the present invention provides a method for eliminating product bubbles for a screw injection molding machine, which obtains a back pressure of the screw injection molding machine, a bubble volume in a product melt, and a bubble removal power of a corresponding ultrasonic bubble remover at each moment based on a set sampling frequency, and further obtains a back pressure sequence, a bubble volume sequence, and a bubble removal power sequence corresponding to a set time period; calculating the bubble removal efficiency in the time period according to the bubble volume sequence and the bubble removal power sequence; forming sample data in the time period by the backpressure sequence, the bubble volume sequence, the bubble removing power sequence and the bubble removing efficiency; obtaining sample data corresponding to the current product melt in a plurality of historical time periods, and classifying all the sample data according to the similarity degree among the sample data to obtain a plurality of classes; calculating average defoaming efficiency of corresponding categories according to the defoaming efficiency contained in each category, and taking the average value of the average defoaming efficiency as the global defoaming efficiency of the current product melt; and acquiring the bubble volume of the current product melt at the next moment, combining the bubble volume and the global bubble removal efficiency to obtain the bubble removal degree at the next moment, and adjusting the back pressure of the screw injection molding machine according to the bubble removal degree. The backpressure is adjusted in real time through the defoaming degree, so that bubbles in the product melt are prevented from being generated, the sol density is enhanced, and the production quality of the product is ensured.
It should be noted that: the precedence order of the above embodiments of the present invention is only for description, and does not represent the merits of the embodiments. And specific embodiments thereof have been described above. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit of the present invention are intended to be included therein.
Claims (4)
1. A method of debubbling a product with respect to a screw injection molding machine, the method comprising:
obtaining the back pressure of the screw injection molding machine, the volume of bubbles in a product melt and the bubble removing power of a corresponding ultrasonic bubble remover at each moment based on the set sampling frequency, and further obtaining a back pressure sequence, a bubble volume sequence and a bubble removing power sequence corresponding to a set time period; calculating the bubble removal efficiency in the time period according to the bubble volume sequence and the bubble removal power sequence; forming the backpressure sequence, the bubble volume sequence, the bubble removing power sequence and the bubble removing efficiency into sample data in the time period;
obtaining sample data corresponding to the current product melt in multiple historical time periods, and classifying all the sample data according to the similarity degree among the sample data to obtain multiple categories; calculating average defoaming efficiency of corresponding categories according to the defoaming efficiency contained in each category, and taking the average value of the average defoaming efficiency as the global defoaming efficiency of the current product melt;
acquiring the bubble volume of the current product melt at the next moment, combining the bubble volume and the global bubble removal efficiency to obtain the bubble removal degree at the next moment, and adjusting the back pressure of the screw injection molding machine according to the bubble removal degree;
the method for calculating the bubble removing efficiency in the time period by the bubble volume sequence and the bubble removing power sequence comprises the following steps:
calculating a first standard deviation between all bubble removing powers in the bubble removing power sequence; calculating a second standard deviation of all bubble volumes in the sequence of bubble volumes; and taking the ratio of the product of the first standard deviation and the second standard deviation to the time length of the time period as the bubble removal efficiency in the corresponding time period.
2. The method of claim 1, wherein said method of classifying all said sample data according to a degree of similarity between said sample data comprises:
and obtaining the sample distance between the sample data corresponding to every two historical time periods by utilizing a Pearson correlation coefficient, and classifying all the sample data through a DBSCAN clustering algorithm based on the sample distance.
3. The method of claim 1, wherein the degree of debubbling is derived from a product between the bubble volume and the global debubbling efficiency.
4. The method of claim 1, wherein said adjusting the back pressure of the screw injection molding machine in accordance with said degree of de-foaming comprises:
and obtaining the adjustment degree of the back pressure according to the defoaming degree, wherein the adjustment degree and the defoaming degree are in positive correlation.
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| CN108748779A (en) * | 2018-05-07 | 2018-11-06 | 晋江万智进出口贸易有限公司 | A kind of injection moulding apparatus for producing plastic products |
| CN112114041A (en) * | 2020-09-17 | 2020-12-22 | 珠海格力电器股份有限公司 | Electronic equipment, and device and method for monitoring bubbles in battery of electronic equipment |
| CN112388917A (en) * | 2020-10-22 | 2021-02-23 | 宁波淳享电子商务有限公司 | Self-defoaming resistance-reducing mold for high-speed injection |
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- 2022-08-09 CN CN202210946895.2A patent/CN115008712B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105415566A (en) * | 2015-12-22 | 2016-03-23 | 常州信息职业技术学院 | Ultrasonic vibration micro-foaming injection moulding device and ultrasonic vibration micro-foaming injection moulding method for plastic inspection well |
| CN108175909A (en) * | 2018-01-29 | 2018-06-19 | 英华达（上海）科技有限公司 | Ultrasonic bubble detection method and system |
| CN108748779A (en) * | 2018-05-07 | 2018-11-06 | 晋江万智进出口贸易有限公司 | A kind of injection moulding apparatus for producing plastic products |
| CN112114041A (en) * | 2020-09-17 | 2020-12-22 | 珠海格力电器股份有限公司 | Electronic equipment, and device and method for monitoring bubbles in battery of electronic equipment |
| CN112388917A (en) * | 2020-10-22 | 2021-02-23 | 宁波淳享电子商务有限公司 | Self-defoaming resistance-reducing mold for high-speed injection |
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