CN101762639A - Mixed state ultrasound on-line monitoring method in polymer production process - Google Patents
Mixed state ultrasound on-line monitoring method in polymer production process Download PDFInfo
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Abstract
The invention discloses a mixed state ultrasound on-line monitoring method in polymer production process, which belongs to the technical field of industrial detection. An ultrasonic sensor which is arranged on a single-screw or twin-screw extruder is used to acquire the amplitude of an ultrasonic echo signal which can reflect the mixed state of a polymer in real time; the temperature and pressure of the molten polymer in a machine barrel acquired by a temperature and pressure sensor in a corresponding place are taken as reference values, and the echo amplitude is corrected and unified by adopting a rank filtering method and a low-pass filtering method; position matching of an amplitude curve in different cycles are completed by adopting a relative coefficient matching method; the amplitude deviation of the ultrasonic echo of corresponding positions in different cycles is calculated, and the mixed state of the polymer is identified by the relationship of the amplitude and the polymer content; and the method can monitor the mixed state of the polymer in the extrusion process on line in real time and provides state parameters for product quality and process adjustment of the polymer.
Description
Technical field: the invention belongs to the industrial detection technical field, be specifically related to mixed state ultrasound on-line monitoring method in a kind of production processes of polyalcohol.
Background technology:
Blend polymer is by the mixing of two or more homopolymer or multipolymer, because its superior performance has become the indispensable class important materials in national economy and national defence field.The blend job operation of polymkeric substance mainly is to mix by single (two) screw extruder.Solid polymer is entered by charging aperture, by the solid-state molten state that becomes, is extruded by the extruder discharging opening and to enter the moulding grinding tool in screw extruder barrel.The quality of final extruded product is relevant with factors such as raw-material performance proportioning, the interior temperature, pressure of machine barrel, extruder screw rotating speed, screw-rod structures, also is presented as the admixture of potpourri different parts in screw extruder barrel simultaneously in process of production.Therefore significant to the online detection of polymer mixed process status in process of production, can utilize testing result in time to adjust production technology, reduce product waste and waste product and pollute, accelerate life cycle of the product.
Mainly instruct production on the polymer production line at present by the temperature and pressure in the monitoring machine barrel, and the method for obtaining admixture information all is an off-line, as the biased sample that obtains by the special sample collecting device that is installed in different parts being carried out physico-chemical analysis, observing mixed process etc. by the windowpane that is installed on the extruder.These methods all can not provide mixed information in real time, accurately, can not meet the needs of production, and have seriously restricted the development of China's Polymer Processing industry.
Ultrasonic detecting technology adopts ultrasound wave when penetrating the polymer blend melt, its echo amplitude, the velocity of sound, attenuation coefficient and acoustic impedance will change with the molten condition of blend, and the admixture that this principle can be used for polymkeric substance diverse location place in During Screw Extrusion detects.During polymer mixed, its molten state temperature in extruder is generally more than 100 ℃, and general ultrasonic probe can only be worked at normal temperatures, influences ultrasonic technique application in this respect.
Summary of the invention:
The object of the invention is to provide mixed state ultrasound on-line monitoring method in a kind of production processes of polyalcohol, adopt this method can on polymer-extruded production line, realize to polymkeric substance admixture of different parts in extruder monitor in real time, function such as state recognition and production analysis.
Mixed state ultrasound on-line monitoring method in the production processes of polyalcohol provided by the invention is characterized in that: by being installed in the amplitude that sonac on single screw rod or the double screw extrusion machine obtains the ultrasound echo signal of reflection polymer mixed state in real time; The temperature and pressure of melt polymkeric substance adopts correction of order filtering and low-pass filtering method and normalization echo amplitude as with reference to amount in the machine barrel that the temperature and pressure transmitter of use correspondence position obtains; Utilization related coefficient matching process is finished the location matches between the amplitude curve different cycles; Calculate the ultrasonic echo amplitude deviation of correspondence position between different cycles, by the relation of amplitude and polymer content, the admixture of identification polymkeric substance.
Can be according to the monitoring requirements at scene, different parts is installed temperature and pressure transmitter and sonac on screw extruder respectively, monitors the polymer mixed state at a plurality of positions simultaneously, realizes the monitoring of polymer mixed process.
Said sonac is made up of ultrasonic probe, sound wave coupling bar and water cooling plant; The centre frequency of ultrasonic probe is 2.5MHz, and excitation pulse is 1 μ s; The sound wave coupling bar is material with the polyetheretherketone, and main part is a column structure, adopts helicitic texture closely to be connected with screw extruder barrel, and the top contacts with ultrasonic probe is bonding, and bottom and extruder barrel inwall are tangent; Thermostatted water in the water cooling plant fully contacts with the sound wave coupling bar.
Beneficial effect of the present invention:
(1) utilizes the pressure and temperature of ultrasonic echo amplitude, machine barrel interpolymer, the admixture of different parts polymkeric substance in the on-line monitoring machine barrel, be not subjected to the influence of people's subjective factor, play the effect of timely guidance and adjustment production technology, enhance productivity effectively, shorten the R﹠D cycle of new product.
(2) sonac has water cooling plant and screw thread mounting structure, is applicable under the high temperature and high pressure environment of polymkeric substance in producing extrusion to work;
(3) to adopt polyetheretherketone be material to the sound wave coupling bar, improved the transmissivity of sound wave at coupling bar and polymer interface, suppressed the noise of trailing that ultrasound wave propagates in cylindrical bar effectively, improved the signal to noise ratio (S/N ratio) of feature echo;
(4) sound wave coupling bar bottom and machine tube inner wall are tangent, can be under impact polymer extruder normal operation not, and the accurate admixture of monitoring polymer;
(5) the ultrasonic echo deviation that adopts same position between different cycles has effectively been avoided because the influence that screw-rod structure causes as characteristic quantity;
(6) use the temperature and pressure of melt polymkeric substance to be reference quantity, adopt order filtering and low-pass filtering method to proofread and correct and the normalization ultrasonic echo amplitude, avoid since the temperature and pressure of melt polymkeric substance to the influence of ultrasound echo signal;
(7) use related coefficient matching process is finished the location matches between the amplitude curve different cycles, has avoided because the irregular accurate comparison that causes the deviation effects correspondence position of sampled point and screw position of screw speed;
(8) incorporating signal processing techniques and industrial control technology can reach the admixture of a plurality of different parts of real-time monitoring polymer mixed process, are easy to expansion; Can preserve, show and analyze Monitoring Data, be applicable to the application of polymkeric substance new-product development.
Description of drawings:
Fig. 1 is sensor installation site figure;
Among Fig. 1, (1a) sensor is installed front elevation, (1b) the circumferential cross-section figure of sensor installation place;
Fig. 2 is propagation and the echo synoptic diagram of ultrasound wave in polymkeric substance;
Among Fig. 2, (2a) propagation principle synoptic diagram, (2b) ultrasonic echo synoptic diagram;
Fig. 3 is the B scintigram of sonac feature echoed signal;
Among Fig. 3, (3a) position I, (3b) position II, (3c) position III, (3d) position IV;
Fig. 4 is a characteristic signal amplitude deviation histogram;
Specific implementation:
The present invention comes characterize polymers admixture information with the ultrasonic echo characteristic quantity, in conjunction with the temperature in the extruder barrel, pressure, by signal processing method, adopt the treatment technology of computing machine, realize the admixture of real time on-line monitoring polymkeric substance in producing extrusion.
Mixed state ultrasound on-line monitoring method in the production processes of polyalcohol is by being installed in the amplitude that sonac on single screw rod or the double screw extrusion machine obtains the ultrasound echo signal of reflection polymer mixed state in real time; The temperature and pressure of melt polymkeric substance adopts correction of order filtering and low-pass filtering method and normalization echo amplitude as with reference to amount in the machine barrel that the temperature and pressure transmitter of use correspondence position obtains; Utilization related coefficient matching process is finished the location matches between the amplitude curve different cycles; Calculate the ultrasonic echo amplitude deviation of correspondence position between different cycles, by the relation of amplitude and polymer content, the admixture of identification polymkeric substance.
According to the monitoring requirements at scene, different parts is installed temperature and pressure transmitter and sonac on screw extruder respectively, monitors the polymer mixed state at a plurality of positions simultaneously, realizes the monitoring of polymer mixed process.
Said sonac is made up of ultrasonic probe, sound wave coupling bar and water cooling plant; The centre frequency of ultrasonic probe is 2.5MHz, and excitation pulse is 1 μ s; The sound wave coupling bar is material with the polyetheretherketone, and main part is a column structure, adopts helicitic texture closely to be connected with screw extruder barrel, and the top contacts with ultrasonic probe is bonding, and bottom and extruder barrel inwall are tangent; Thermostatted water in the water cooling plant fully contacts with the sound wave coupling bar.
As shown in Figure 1a, different parts on the screw extruder barrel is equipped with temperature and pressure transmitter and sonac, shown in Fig. 1 b, TPT and UT represent temperature and pressure transmitter and sonac respectively among Fig. 1 b at the relative position of circumferencial direction for temperature and pressure transmitter and sonac.Computer control system is the ultrasonic signal of temperature, pressure and the sonac of synchronous acquisition multi way temperature pressure transducer simultaneously, and extracts the feature echo amplitude of reflection polymer mixed state; For arbitrary position, earlier be that reference quantity is proofreaied and correct the ultrasonic echo amplitude in ought be for the previous period with the temperature and pressure, carry out order filtering again, filtering changes the amplitude saltus step that influences owing to screw-rod structure, then adopt the low-pass filtering method extract amplitude variations trend to, the normalization echo amplitude uses the related coefficient matching process to carry out location matches the amplitude curve employing in interior a plurality of cycles during this period of time; According to the result of location matches, calculate the ultrasonic echo amplitude deviation of all same positions, and draw comprehensive deviation; By the relation of amplitude and polymer content, adopt the admixture of comprehensive deviation identification polymkeric substance, and show at last.In actual applications, can increase the FEEDBACK CONTROL that control module realizes polymer-extruded process as required.
The extraction of ultrasonic feature echo is the transonic principle according to Fig. 2, sound wave is propagated through sound wave coupling bar, melt polymkeric substance, produce echo L1 and L2 at coupling bar/polymer interface and polymkeric substance/screw rod interface, receive by ultrasonic probe at last, the typical echoed signal that obtains as shown in Figure 3, the A2 among Fig. 3 is the ultrasonic feature echo amplitude.
Application example:
Carry out the bulk testing of 90% low density polyethylene (LDPE) and 10% lime carbonate at single screw extrusion machine.The machine barrel internal diameter is φ 90mm, and the long 1600mm of screw rod, screw speed are 10r/min; Pressure-temperature sensor adopts PT124B/PT124G; Four positions in Fig. 1 are installed identical sonac and are detected, Fig. 4 is the feature echoed signal B scintigram of four positions, the as can be seen from the figure feature echo amplitude big rise and fall that detects at position I place, and it is the most stable in the feature echoed signal at position IV place, Fig. 5 has listed the relative variance (ratio of variance and average of four position probing feature echo amplitudes, expression relative deviation amount) contrast situation, the feature echoed signal is stable more, the amplitude variance is more little along with carrying out of mixing in explanation, can detect the admixture of two kinds of polymkeric substance according to these characteristics.
Claims (3)
1. mixed state ultrasound on-line monitoring method in the production processes of polyalcohol is characterized in that: by being installed in the amplitude that sonac on single screw rod or the double screw extrusion machine obtains the ultrasound echo signal of reflection polymer mixed state in real time; The temperature and pressure of melt polymkeric substance adopts correction of order filtering and low-pass filtering method and normalization echo amplitude as with reference to amount in the machine barrel that the temperature and pressure transmitter of use correspondence position obtains; Utilization related coefficient matching process is finished the location matches between the amplitude curve different cycles; Calculate the ultrasonic echo amplitude deviation of correspondence position between different cycles, by the relation of amplitude and polymer content, the admixture of identification polymkeric substance.
2. mixed state ultrasound on-line monitoring method in the production processes of polyalcohol according to claim 1, it is characterized in that: according to the monitoring requirements at scene, different parts is installed temperature and pressure transmitter and sonac on screw extruder respectively, monitor the polymer mixed state at a plurality of positions simultaneously, realize the monitoring of polymer mixed process.
3. mixed state ultrasound on-line monitoring method in the production processes of polyalcohol according to claim 1 is characterized in that: said sonac is made up of ultrasonic probe, sound wave coupling bar and water cooling plant; The centre frequency of ultrasonic probe is 2.5MHz, and excitation pulse is 1 μ s; The sound wave coupling bar is material with the polyetheretherketone, and main part is a column structure, adopts helicitic texture closely to be connected with screw extruder barrel, and the top contacts with ultrasonic probe is bonding, and bottom and extruder barrel inwall are tangent; Thermostatted water in the water cooling plant fully contacts with the sound wave coupling bar.
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Cited By (7)
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|---|---|---|---|---|
| CN106018548A (en) * | 2016-05-23 | 2016-10-12 | 华中科技大学 | Ultrasonic online detection method and system for uniformity of solid-liquid two-phase mixture |
| CN108319809A (en) * | 2018-02-02 | 2018-07-24 | 北京化工大学 | A kind of device and method of on-line checking polymer plasticization degree |
| CN109196350A (en) * | 2016-05-25 | 2019-01-11 | 法国电力公司 | Pass through the method for the defects of ultrasound detection material |
| CN111855491A (en) * | 2019-04-28 | 2020-10-30 | 中国石油化工股份有限公司 | Method and device for detecting flow state of polymer melt |
| CN112740027A (en) * | 2018-09-26 | 2021-04-30 | Abb瑞士股份有限公司 | Non-invasive monitoring of a mixing process in a container |
| CN112743795A (en) * | 2020-12-22 | 2021-05-04 | 中国兵器装备集团自动化研究所 | Prevent remaining extruder |
| CN114957663A (en) * | 2022-05-27 | 2022-08-30 | 成都新晨新材科技有限公司 | Continuous polymerization control process, device and system of PBO polymer and computer readable storage medium |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018548A (en) * | 2016-05-23 | 2016-10-12 | 华中科技大学 | Ultrasonic online detection method and system for uniformity of solid-liquid two-phase mixture |
| CN109196350A (en) * | 2016-05-25 | 2019-01-11 | 法国电力公司 | Pass through the method for the defects of ultrasound detection material |
| CN109196350B (en) * | 2016-05-25 | 2020-01-14 | 法国电力公司 | Method for detecting defects in materials by ultrasound |
| CN108319809A (en) * | 2018-02-02 | 2018-07-24 | 北京化工大学 | A kind of device and method of on-line checking polymer plasticization degree |
| CN112740027A (en) * | 2018-09-26 | 2021-04-30 | Abb瑞士股份有限公司 | Non-invasive monitoring of a mixing process in a container |
| CN112740027B (en) * | 2018-09-26 | 2024-08-27 | Abb瑞士股份有限公司 | Non-invasive monitoring of mixing process in container |
| US12115509B2 (en) | 2018-09-26 | 2024-10-15 | Abb Schweiz Ag | Non-invasive monitoring of a mixing process in a container |
| CN111855491A (en) * | 2019-04-28 | 2020-10-30 | 中国石油化工股份有限公司 | Method and device for detecting flow state of polymer melt |
| CN111855491B (en) * | 2019-04-28 | 2023-08-22 | 中国石油化工股份有限公司 | Method and device for detecting flow state of polymer melt |
| CN112743795A (en) * | 2020-12-22 | 2021-05-04 | 中国兵器装备集团自动化研究所 | Prevent remaining extruder |
| CN114957663A (en) * | 2022-05-27 | 2022-08-30 | 成都新晨新材科技有限公司 | Continuous polymerization control process, device and system of PBO polymer and computer readable storage medium |
| CN114957663B (en) * | 2022-05-27 | 2023-08-25 | 成都新晨新材科技有限公司 | PBO polymer continuous polymerization control process, device and system thereof and computer readable storage medium |
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Application publication date: 20100630 |