CN209937383U - Device for on-line detection of blending effect of eccentric rotor extruder - Google Patents
Device for on-line detection of blending effect of eccentric rotor extruder Download PDFInfo
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- CN209937383U CN209937383U CN201920315942.7U CN201920315942U CN209937383U CN 209937383 U CN209937383 U CN 209937383U CN 201920315942 U CN201920315942 U CN 201920315942U CN 209937383 U CN209937383 U CN 209937383U
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Abstract
The utility model discloses a device for on-line measuring eccentric rotor extruder blending effect, including computer, ultrasonic detector, air coupled ultrasonic transmitter and air coupled ultrasonic receiver, the computer is connected with ultrasonic detector, ultrasonic detector is connected with air coupled ultrasonic transmitter and air coupled ultrasonic receiver respectively, air coupled ultrasonic transmitter and air coupled ultrasonic receiver set up on the stator of eccentric rotor extruder; the utility model discloses this air coupling formula supersound transmission and receiving arrangement is applicable to eccentric rotor extruder and has the structure alone, contains the cooling water course and ensures ultrasonic transducer at suitable operating temperature, and magnetism is inhaled formula structure and air coupling formula supersound and can be detected the mixing state of eccentric rotor extruder arbitrary section, and can not destroy the stator of eccentric rotor extruder.
Description
Technical Field
The utility model relates to an on-line measuring field, concretely relates to a device that is used for on-line measuring eccentric rotor extruder to blend effect.
Background
Polymer blending is a process in which two or more polymers are blended together in the proper proportions to achieve properties not achieved by a single polymer. The polymer blend processing method is generally mixing by a conventional single (twin) screw extruder. Compared with the traditional extruder screw, the eccentric rotor extruder based on the volume stretching deformation plasticizing transportation method can effectively avoid the defect that the traditional single (double) screw shears the flow field through the special spatial topological relation, so that the polymer is mixed more fully. Therefore, the online detection of the blending state of each section of the eccentric rotor extruder plays an important role in researching the blending mechanism and improving the production quality and benefit.
At present, the method for detecting the blending state of the polymer in the extruder generally comprises the steps of punching a hole in a cylinder of the extruder part, installing a glass window and then using an optical microscope, or installing a material taking device and then taking out a melt for off-line test analysis. Especially for an eccentric rotor extruder, the curved surface of a stator cavity is meshed with an eccentric rotor, the curved surface is extremely complex, the thread pitch of certain sections is small, holes cannot be punched, and excessive punching can damage the stator (charging barrel) cavity and affect the stator sealing property.
The ultrasonic wave has the advantages of high sensitivity, strong penetrating power, good directivity, low cost and the like. The ultrasonic online detection is a technology for online detection of different mixed states of polymers by utilizing the principle that the echo signal characteristics of ultrasonic waves after penetrating through a polymer melt can change along with the melt state. The traditional method for monitoring the blending state on line by ultrasonic is to directly perforate on processing equipment and enable a monitoring probe to be directly or indirectly contacted with a melt, and although the method can reduce the signal attenuation and the environmental noise influence of ultrasonic, the method cannot be applied to an eccentric rotor extruder with a complex stator cavity curve.
SUMMERY OF THE UTILITY MODEL
In order to overcome the shortcoming and the deficiency that prior art exists, the utility model provides a device that is used for on-line measuring eccentric rotor extruder to blend effect.
The utility model utilizes the magnetic suction type and non-contact air coupling type ultrasonic online detection device for the mixing state of the eccentric rotor extruder, and solves the problem that the traditional measuring device can not be applied to the eccentric rotor extruder; the method is characterized in that machine learning is utilized to process data, a prediction model for detecting the blending state of the polymer in each section of the eccentric rotor extruder is established by a convenient and efficient method, and the problems of few evaluation devices for the processing effect of the eccentric rotor extruder, low detection precision and the like are solved.
The utility model adopts the following technical scheme:
a device for detecting the blending effect of an eccentric rotor extruder on line comprises a computer, an ultrasonic detector, an air coupling type ultrasonic transmitting device and an air coupling type ultrasonic receiving device, wherein the computer is connected with the ultrasonic detector which is respectively connected with the air coupling type ultrasonic transmitting device and the air coupling type ultrasonic receiving device, and the air coupling type ultrasonic transmitting device and the air coupling type ultrasonic receiving device are arranged on a stator of the eccentric rotor extruder;
the air coupling type ultrasonic transmitting device and the air coupling type ultrasonic receiving device both comprise high-temperature resistant magnets, a retainer, a spherical joint and a cooling device, wherein the high-temperature resistant magnets are arranged at two ends of the retainer and used for being fixed with a stator of an eccentric rotor extruder, the spherical joint is arranged in the middle of the retainer, the air coupling type ultrasonic transmitting device further comprises an ultrasonic transducer transmitting probe which is arranged on the spherical joint, and the air coupling type ultrasonic receiving device further comprises an ultrasonic transducer receiving probe which is arranged on the spherical joint.
The cooling device comprises a cooling water channel and a sealing weldment, wherein the cooling water channel is used for cooling the ultrasonic transducer transmitting probe or the ultrasonic transducer receiving probe, and a cooling water channel loop is formed through the sealing weldment.
An eccentric rotor is arranged in the stator.
The retainer is arc-shaped.
The utility model has the advantages that:
(1) the utility model adopts the high temperature resistant magnet to be magnetically attracted on the stator of the extruder, can detect the mixing state of any section of the extruder, and can not damage the stator structure;
(2) the ultrasonic transducer transmitting and receiving device of the utility model is provided with the backflow type cooling water channel which can eliminate the influence of high temperature on the ultrasonic probe;
(3) the utility model discloses ultrasonic transducer transmission and receiving arrangement all is provided with spherical joint and can makes the angle that ultrasonic transmission and receiving probe be applicable to eccentric rotor complex curved surface.
Drawings
Fig. 1 is a schematic structural diagram of the present invention:
fig. 2 is the structure schematic diagram of the air-coupled ultrasonic transmitter of the present invention:
fig. 3 is a schematic structural diagram of the air-coupled ultrasonic receiving apparatus of the present invention:
fig. 4 is a schematic diagram of the ultrasonic signal propagation of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.
Examples
As shown in fig. 1 and 2, a device for online detection of blending effect of an eccentric rotor extruder comprises a computer, an ultrasonic detector 11, an air coupling type ultrasonic transmitting device i and an air coupling type ultrasonic receiving device ii, an eccentric rotor 9 and a stator 10, wherein the computer is connected with the ultrasonic detector 11, the ultrasonic detector 11 is respectively connected with the air coupling type ultrasonic transmitting device i and the air coupling type ultrasonic receiving device ii, the three devices form a processing system of ultrasonic signals, and the air coupling type ultrasonic transmitting device i and the air coupling type ultrasonic receiving device ii are arranged on the stator 10 of the eccentric rotor extruder;
the air coupling type ultrasonic transmitting device is shown in figure 2 and comprises two high temperature resistant magnets 1, a retainer 2, a spherical joint 3, an ultrasonic transducer transmitting probe 4 and a cooling device 5. Two high temperature resistant magnets are respectively arranged at two ends of the retainer 2, the retainer 2 is arc-shaped in the embodiment, and the ultrasonic transmitting device can be fixed at any position of the stator through the high temperature resistant magnets 1. In the embodiment, the spherical joint 3 is positioned in the center of the retainer 2, the ultrasonic transducer transmitting probe 4 is fixed on the spherical joint 5, and the spherical joint 5 can adjust the incident angle of the ultrasonic transducer transmitting probe 4 to ensure that the ultrasonic incident signal is incident. The position of the ultrasonic transmitting device I and the incident angle of the transmitting probe 4 are adjusted to ensure that the incident direction of the ultrasonic signal is vertical to the surface of the cavity, so that the intensity of the incident ultrasonic signal is maximum; the addition of the spherical joint 5 is suitable for an eccentric rotor extruder with a complex cavity.
As shown in fig. 3 and 4, the structure of the air-coupled ultrasonic transmitter i is substantially the same as that of the air-coupled ultrasonic receiver ii, the ultrasonic transducer transmitting probe 4 is changed to an ultrasonic transducer receiving probe 8, the rest of the structure is the same as that of the air-coupled ultrasonic receiver, the ultrasonic transducer receiving probe 4 is arranged on a spherical joint, and the spherical joint can arbitrarily adjust the receiving angle of the ultrasonic transducer receiving probe 8. The maximum intensity of the first ultrasonic echo signal of the received melt is ensured by adjusting the position of the ultrasonic receiving device II and the receiving angle of the receiving probe 8.
In the embodiment, the air coupling type ultrasonic receiving device and the transmitting device are arranged near the discharge port end when the model is established.
In this embodiment, an eccentric rotor 9 is provided inside the stator of the eccentric rotor extruder.
The cooling device can make the ultrasonic transmitting and receiving probe suitable for high temperature environment, the cooling device 5 comprises a cooling water channel 6 for cooling and a sealing weldment 7, and the cooling water channel 6 for backflow is formed by the cooling device 5 through the sealing weldment 7.
The method comprises the steps of firstly measuring to obtain a first melt echo signal of a series of standard samples with known proportion at the same temperature and different rotating speeds, then obtaining a scanning electron microscope picture of the corresponding extruded sample, carrying out image processing and calculating to obtain a dispersion coefficient, then establishing a prediction model between the dispersion index and the first melt echo signal by utilizing a frequency domain analysis and support vector machine (SVR) model, and finally predicting the blending state of a sample to be measured with a known proportion in different sections of an eccentric rotor extruder by utilizing the model.
The utility model discloses a working process:
the device is placed according to the mode shown in figure 1, and the ultrasonic transducer transmitting probe 4 and the ultrasonic transducer receiving probe 8 are adjusted on the discharge end of the stator of the eccentric rotor extruder, so that the signal intensity of ultrasonic signal transmission and reception is the maximum.
A blend of 10 PP/PS blends was prepared at blend ratio 40/60. Obtaining corresponding samples after blending is finished at the same temperature and different rotating speeds (the rotating speed of a stator is 10/30/50/70/90/140/180/220/260/300rpm), carrying out brittle fracture on the samples by using liquid nitrogen, etching a PS dispersion phase in a PP/PS blending phase by using diphenyl methane, and then carrying out scanning electron microscope photos taken after corresponding processing;
counting the number distribution of holes in each diameter range of the holes in the image after image processing, and obtaining a dispersion coefficient;
the air coupling type ultrasonic measurement is utilized to measure the first melt echo signal of PP/PS close to the discharge port, the melt echo signal is subjected to Fourier transform, and then the low frequency band of a logarithmic magnitude spectrum is taken as an ultrasonic characteristic vector M0Then, combining the obtained dispersion coefficients corresponding to the dispersion coefficients to establish a support vector machine regression (SVR) prediction model;
the first melt echo signal of a PP/PS sample to be measured with 40/60 proportion at any section of an eccentric rotor extruder at a known rotating speed (any rotating speed within a specified range, such as 105rpm) is measured, the corresponding ultrasonic characteristic vector M is obtained after the signal processing of the previous step, and the ultrasonic characteristic vector M is substituted into an established prediction model to obtain the dispersion coefficient of the sample at any section at a certain rotating speed.
The utility model discloses air coupling formula supersound transmission and receiving arrangement is applicable to eccentric rotor extruder and has the structure alone, contains the cooling water course and ensures ultrasonic transducer at suitable operating temperature, and magnetism is inhaled formula structure and air coupling formula supersound and can be detected the mixing state of eccentric rotor extruder arbitrary section optional position, and can not destroy the stator of eccentric rotor extruder.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (4)
1. A device for detecting the blending effect of an eccentric rotor extruder on line is characterized by comprising a computer, an ultrasonic detector, an air coupling type ultrasonic transmitting device and an air coupling type ultrasonic receiving device, wherein the computer is connected with the ultrasonic detector which is respectively connected with the air coupling type ultrasonic transmitting device and the air coupling type ultrasonic receiving device, and the air coupling type ultrasonic transmitting device and the air coupling type ultrasonic receiving device are arranged on a stator of the eccentric rotor extruder;
the air coupling type ultrasonic transmitting device and the air coupling type ultrasonic receiving device both comprise high-temperature resistant magnets, a retainer, spherical joints and a cooling device, wherein the high-temperature resistant magnets are arranged at two ends of the retainer and used for being fixed with a stator of an eccentric rotor extruder, the spherical joints are arranged in the middle of the retainer, the air coupling type ultrasonic transmitting device further comprises an ultrasonic transducer transmitting probe which is arranged on the spherical joints, and the air coupling type ultrasonic receiving device further comprises an ultrasonic transducer receiving probe which is arranged on the spherical joints.
2. The device for on-line detection of blending effect of the eccentric rotor extruder as claimed in claim 1, wherein the cooling device comprises a cooling water channel for cooling the transmitting probe of the ultrasonic transducer or the receiving probe of the ultrasonic transducer and a sealing weldment, and a cooling water channel loop is formed by the sealing weldment.
3. The device for on-line detecting the blending effect of the eccentric rotor extruder as claimed in claim 1, wherein the eccentric rotor is arranged inside the stator.
4. The device for on-line detecting the blending effect of the eccentric rotor extruder as claimed in claim 1, wherein the retainer is arc-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920315942.7U CN209937383U (en) | 2019-03-13 | 2019-03-13 | Device for on-line detection of blending effect of eccentric rotor extruder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920315942.7U CN209937383U (en) | 2019-03-13 | 2019-03-13 | Device for on-line detection of blending effect of eccentric rotor extruder |
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| CN209937383U true CN209937383U (en) | 2020-01-14 |
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| CN201920315942.7U Active CN209937383U (en) | 2019-03-13 | 2019-03-13 | Device for on-line detection of blending effect of eccentric rotor extruder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110000947A (en) * | 2019-03-13 | 2019-07-12 | 华南理工大学 | A kind of device and method that effect being blended for on-line checking eccentric rotor extruder |
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- 2019-03-13 CN CN201920315942.7U patent/CN209937383U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110000947A (en) * | 2019-03-13 | 2019-07-12 | 华南理工大学 | A kind of device and method that effect being blended for on-line checking eccentric rotor extruder |
| CN110000947B (en) * | 2019-03-13 | 2023-12-22 | 华南理工大学 | Device and method for online detection of blending effect of eccentric rotor extruder |
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