CN113118144B - High-frequency ultrasonic dust removal device for lithium battery industry - Google Patents
High-frequency ultrasonic dust removal device for lithium battery industry Download PDFInfo
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- CN113118144B CN113118144B CN202110470234.2A CN202110470234A CN113118144B CN 113118144 B CN113118144 B CN 113118144B CN 202110470234 A CN202110470234 A CN 202110470234A CN 113118144 B CN113118144 B CN 113118144B
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- 239000000428 dust Substances 0.000 title claims abstract description 105
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 21
- 230000005284 excitation Effects 0.000 claims description 15
- 239000000919 ceramic Substances 0.000 claims description 9
- 230000004069 differentiation Effects 0.000 claims description 9
- 230000033001 locomotion Effects 0.000 claims description 9
- 230000010354 integration Effects 0.000 claims description 8
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- 238000003825 pressing Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 230000003749 cleanliness Effects 0.000 abstract description 11
- 238000011217 control strategy Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000009471 action Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 239000012528 membrane Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010405 anode material Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
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- 238000009499 grossing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/02—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned
- B08B7/026—Using sound waves
- B08B7/028—Using ultrasounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/04—Cleaning by suction, with or without auxiliary action
- B08B5/043—Cleaning travelling work
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- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The invention provides a high-frequency ultrasonic dust removal device in the lithium battery industry, wherein a certain cleanliness degree can be obtained on an electrode belt or a diaphragm in a safe and efficient manner by utilizing a direct contact vibration manner and a specific power control strategy in a first-stage dust removal structure, then deeper dust removal treatment is provided for the electrode belt or the diaphragm in a second-stage dust removal structure by utilizing a manner of combining air flow and ultrasonic vibration, and finally comprehensive dust removal treatment is provided for the electrode belt or the diaphragm in an efficient and safe manner, so that the electrode belt or the diaphragm with high cleanliness degree is provided.
Description
Technical Field
The invention relates to the field of lithium battery production, in particular to a high-frequency ultrasonic dust removal device in the lithium battery industry.
Background
In the production of lithium batteries, cleanliness is an important factor affecting the quality of the batteries, especially for the manufacturing process of fine parts in lithium batteries. For this reason, a dust removal or cleaning unit is often required to be disposed on a production line of the lithium battery to perform necessary processing on various battery assemblies so as to obtain required cleanliness, thereby ensuring the quality of the finally obtained lithium battery.
The pole belt and the diaphragm are necessary materials for producing the lithium battery, and impurities such as dust, anode and cathode material residues, molten beads and the like are easily attached to the pole belt and the diaphragm in the production process, so that the quality and cleanliness of subsequent processes such as coating, slitting, winding and the like are affected, and the inherent quality risk of the lithium battery produced in the unsafe environment exists.
In the prior art, a cleaning function is usually realized by a brush cleaning mode and a negative pressure dust suction mode. Dust is easy to adhere to the brush, so that the dust is not thoroughly cleaned; the brush is in contact with the surfaces of the polar band and the diaphragm, and the surfaces of the polar band and the diaphragm are easy to scratch after cleaning; meanwhile, the problem of the falling of the brush cannot be shielded; the fine substances on the adhesion layer can not be removed. Therefore, the prior art also proposes to adopt an ultrasonic dust removal technology in the production of the lithium battery. However, the production of the electrode strip and the diaphragm has high requirements on the cleanliness of the surface of the electrode strip and the diaphragm, and the dust removal operation cannot cause damage to the surface of the electrode strip and the diaphragm. Therefore, how to efficiently remove dust from the surface of the electrode belt and the separator becomes an important issue for improving the production efficiency of the lithium battery.
Disclosure of Invention
In order to solve the problem, the invention provides a high-frequency ultrasonic dust removal device in the lithium battery industry, wherein a certain cleanliness can be obtained on an electrode strip or a diaphragm in a safe and efficient manner by utilizing a direct contact vibration manner and a specific power control strategy in a first-stage dust removal structure, then deeper dust removal treatment is provided for the electrode strip or the diaphragm in a second-stage dust removal structure by utilizing a combination manner of air flow and ultrasonic vibration, and finally comprehensive dust removal treatment is provided for the electrode strip or the diaphragm in an efficient and safe manner, so that the electrode strip or the diaphragm with high cleanliness is provided.
Specifically, the high-frequency ultrasonic dust removal device in the lithium battery industry of the invention may include a first rotating roller, a second rotating roller, a first ultrasonic dust removal unit and a second ultrasonic dust removal unit, wherein:
the first rotating roller is used for driving the polar belt or the diaphragm to move and is arranged to change the polar belt or the diaphragm from vertical movement to horizontal movement;
the first ultrasonic dust removal unit is arranged at the downstream of the first rotating roller, is arranged to enable the horizontal movement direction of the polar belt or the diaphragm to be turned by 180 degrees, and carries out primary dust removal treatment on the polar belt or the diaphragm in a direct contact vibration mode;
the second rotating roller is used for driving the polar belt or the diaphragm to move and is arranged at the downstream of the first ultrasonic dust removal unit;
the second ultrasonic dust removal unit is arranged near the second rotating roller and is used for carrying out secondary dust removal treatment on the polar belt or the diaphragm by utilizing gas and ultrasonic signals generated by gas resonance.
Further, the first ultrasonic dust removal unit comprises a first ultrasonic generator, a second ultrasonic generator, a vibration element and a control unit;
the first and second ultrasonic generators are arranged to generate ultrasonic signals according to control signals of the control unit, and respectively comprise a piezoelectric transducer and an amplitude transformer;
the vibrating element is in a hollow cylindrical shape;
the first ultrasonic generator and the second ultrasonic generator are fixedly connected to the outer side surface of the vibration element in an acoustic coupling mode through amplitude transformer rods, wherein a preset angle is formed between the amplitude transformer rods of the first ultrasonic generator and the second ultrasonic generator.
Further, the piezoelectric transformer includes electrodes for receiving an excitation signal, a plurality of piezoelectric ceramic ring elements sandwiched in a stacked manner between the electrodes, front and rear portions for pressing the piezoelectric ceramic ring elements, and a bolt portion and a nut for integrally connecting the piezoelectric ceramic ring elements, the front and rear portions;
the horn has a circular cross-section S (x) with a gradually changing diameter in the longitudinal direction, and the cross-section S (x) satisfies the following relationship in the longitudinal direction with the input end as a zero point: s (x) ═ S 1 *e -A*x Wherein S is 1 Is the cross-sectional area at the input end, factor
D1 and D2 are the diameters of the input and output ends, respectively, and L is the longitudinal length of the horn.
Further, the control unit is arranged to send control signals to the first and second sonotrodes, respectively, for alternately operating the sonotrodes in a first and a second operating state, wherein: in the first working state, applying an excitation signal to the first ultrasonic generator, and simultaneously enabling the second ultrasonic generator to generate short circuit; in the second working state, the first ultrasonic generator is short-circuited, and an excitation signal is applied to the second ultrasonic generator;
and there is a 90 degree phase difference between the excitation signal applied to the first ultrasonic generator in the first operating condition and the excitation signal applied to the second ultrasonic generator in the second operating condition.
Further, the preset angle is 15-20 degrees; and, the first ultrasonic dust removing unit further comprises a vacuum cover disposed to cover a contact area of the vibration element with respect to the pole belt or the diaphragm, for sucking the detached dust.
Further, the control unit further comprises an AC/DC converter, a pulse density modulation driver, a transformer and a control component;
the control assembly includes a fuzzy logic controller configured to control an output duty cycle of the ultrasonic generator to provide a wide range of power adjustments and a PID controller configured to provide a fine power adjustment.
Further, the output U of the PID controller PID Is configured to:
U PID (k)＝U integral of (k)+U Differentiation of (k)+U Ratio of (k)
U ratio of (k)＝Kc*P E (k) A proportional unit output of the PID controller;
power deviation P E (k)＝P(k)-P 0 P (k) is the actual power value at time k, P 0 Is a set power value; i is an integral variable between 0 and k; kc is the controller gain; ti is the integration time and Td is the differentiation time.
Further, the fuzzy logic controller is arranged to control the output duty cycle of the ultrasonic generator in dependence on a power error rate E1 and a frequency error rate E2, E1 ═ P 0 -P(k))/P 0 ，E2＝(F 0 -F(k))/F 0 ，F 0 To set the frequency, F (k) isFrequency is measured;
and the fuzzy logic controller is further configured to employ a fuzzy rule base as follows:
further, the second ultrasonic dust removal unit comprises a first air inlet, a second air inlet, a spiral air passage, an air chamber, an air outlet and a dust collection port;
the first and second air inlets are respectively used for introducing first and second compressed air flows with first and second pressures, and a preset pressure difference is formed between the first pressure and the second pressure;
the helical air passage for directing the first and second flows of compressed air into the air chamber;
the outlet is arranged in the vicinity of the polar band or diaphragm so that a high-frequency ultrasonic signal generated by the first and second compressed air flows and their resonance acts on the surface of the polar band or diaphragm;
the suction opening is arranged to suck dust detached from the surface of the pole belt or diaphragm.
Further, the second ultrasonic dust removal unit further comprises a dust collector for collecting dust from the dust suction port.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in 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 for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 shows a schematic diagram of a high-frequency ultrasonic dust removal device in the lithium battery industry according to the invention.
Detailed Description
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are provided by way of illustration in order to fully convey the spirit of the invention to those skilled in the art to which the invention pertains. Accordingly, the present invention is not limited to the embodiments disclosed herein.
Fig. 1 shows a high-frequency ultrasonic dust removal device in the lithium battery industry according to the invention.
As shown in fig. 1, the ultrasonic dust removing device may include a first rotating roller 1, a second rotating roller 2, a first ultrasonic dust removing unit 3, and a second ultrasonic dust removing unit 4.
The first and second rotating rollers 1, 2 are used to move the pole belt or membrane.
The first ultrasonic dust removing unit 3 is used for performing a first-stage dust removing process on the polar belt or the diaphragm, and may include a first ultrasonic generator 32, a second ultrasonic generator 33, a vibration member 31, a vacuum housing 34, and a control unit (not shown).
The first and second ultrasonic generators 32/33 are used to generate an ultrasonic signal according to a control signal of the control unit and output it to the vibration element 31.
The ultrasonic generator 32/33 may include a piezoelectric transducer and an amplitude transformer.
The piezoelectric transducer may include: an electrode for receiving an excitation signal; a plurality of (e.g., 2) piezoelectric ceramic ring elements sandwiched in a stacked manner between the electrodes; a front portion and a rear portion for pressing the piezoelectric ceramic ring element; a bolt part and a nut for integrally connecting the piezoelectric ceramic ring element, the front part and the rear part.
In order to improve the output efficiency and achieve impedance matching between the ultrasonic generator and the vibrating element, the horn in the present invention may be designed to have a circular cross section s (x) with a diameter gradually changing in the longitudinal direction, and the cross section s (x) satisfies the following relationship in the longitudinal direction with the input end as a zero point: s (x) ═ S 1 *e -A*x Wherein S1 is the cross-sectional area at the input end, coefficient
D1 and D2 are the diameters of the input end (wider end) and output end (narrower end), respectively, and L is the longitudinal length of the horn.
In the present invention, the vibration element 31 has a hollow cylindrical shape, and the first and second ultrasonic generators are fixedly attached to the outer side surface of the vibration element by means of their horns, respectively, in an acoustically coupled manner, wherein the horns of the first and second ultrasonic generators form a predetermined angle (e.g., 15 to 20 degrees) therebetween.
In the first ultrasonic dust removal unit, the control unit sends control signals to the first and second ultrasonic generators, respectively, for causing the ultrasonic generators to alternately operate in the first and second operating states. In a first working state, applying an excitation signal to the first ultrasonic generator, and simultaneously enabling the second ultrasonic generator to generate short circuit; in a second operating state, the first ultrasonic generator is short-circuited while an excitation signal is applied to the second ultrasonic generator.
Further, by making a phase difference of 90 degrees between the excitation signal applied to the first ultrasonic generator in the first operation state and the excitation signal applied to the second ultrasonic generator in the second operation state, the ultrasonic signals output from the first and second ultrasonic generators to the vibration element can be made to eventually form a traveling wave in the vibration element, thereby allowing the same vibration effect to be produced at any position on the cylindrical outer surface of the vibration element.
With continued reference to fig. 1, a first rotating roller 1 may be provided to change the pole strip or membrane from a vertical movement to a horizontal movement. The vibration element 31 in the first ultrasonic dust removing unit 3 may be disposed downstream of the first rotating roller 1 for 180-degree turning of the horizontal moving direction of the polar belt or the diaphragm. A second rotating roller 2 may be arranged downstream of the oscillating element 31 for bringing the polar tape or membrane into motion.
At this time, when the pole piece or the diaphragm passes through the vibration element 31, it comes into close contact with a half circumferential surface of the vibration element. By the vibration action of the ultrasonic generator on the vibrating element, the ultrasonic vibration action can be simultaneously applied to the polar belt or the diaphragm with the half circumference length, so that the dust on the surface of the polar belt or the diaphragm is separated or loosened. Because the same area on the polar band or the diaphragm can continuously receive the vibration action on the path of half of the circumference length, the dust removal efficiency of the first ultrasonic dust removal unit can be greatly improved. In addition, in the dust removal mode of direct contact vibration, the pole belt or the diaphragm in a tight state is easily damaged due to uneven local stress, especially in the case of a long and thin stress area. However, in the first ultrasonic dust removal unit of the present invention, since the vibration element can provide substantially the same vibration effect over the entire circumference thereof, the tearing effect that may be caused to the pole piece or the diaphragm due to the uneven distribution of vibration over a wide range (half the circumferential length) of the vibration action area provided by the present invention can be effectively avoided.
In the first ultrasonic dust removing unit, a vacuum hood 34 may be provided to cover a contact area of the vibration element 31 with respect to the pole belt or the diaphragm for sucking off dust.
Further, as described above, since the dust removing manner of the direct contact vibration is adopted in the first ultrasonic dust removing unit, the stability or controllability of the vibration action on the vibration element is very important for the dust removing effect. For example, for different types of pole strips or diaphragms (different in thickness or material, etc.), or pole strips or diaphragms with different contamination levels, different levels of vibration need to be provided, while also ensuring stability during power switching or normal operation, avoiding providing abrupt vibration. Therefore, in the first ultrasonic dust removal unit, the control unit is also used for providing a fine and wide-range power regulation function for the ultrasonic generator so as to be capable of meeting the requirements of various lithium battery production in the lithium battery industry.
According to the present invention, the control unit may include an AC/DC converter, a Pulse Density Modulation (PDM) driver, a transformer, and a control component.
The AC/DC converter may employ a full-wave rectifier having a smoothing capacitor for obtaining a smoothed DC output voltage.
The PDM driver is used to control the IGBT circuit, and the transformer is used to generate a drive voltage for the piezoelectric transformer.
The control assembly may then generate a control signal for the PDM driver to effect power control for the ultrasonic generator.
In particular, the control component may include a fuzzy logic controller and a PID controller. Output U of PID controller PID Can be expressed in the following forms:
U PID (k)＝U integration (k)+U Differentiation of (k)+U Ratio of (k)
Wherein:
U ratio of (k)＝Kc*P E (k) It is the proportional unit output of the PID controller;
power deviation P E (k)＝P(k)-P 0 P (k) is the actual power value at time k, P 0 Is a set power value; i is an integral variable between 0 and k; kc is the controller gain; ti is the integration time (min) and Td is the differentiation time (min).
In the PID controller, the power offset related to the steady state can be eliminated by the aid of the integration unit, the power prediction quantity is obtained by the aid of the differentiation unit, severe fluctuation of an output value when the current power value or the power set value is remarkably changed is effectively avoided, a differentiation impact event is avoided, overshoot offset can be provided when a nonlinear adjustment event occurs, fine power adjustment of the ultrasonic generator can be achieved, power mutation is avoided, and high efficiency and reliability of dust removal are guaranteed.
The fuzzy logic controller is used to control the output duty cycle of the ultrasonic generator according to the power error rate E1 and the frequency error rate E2, thereby achieving a wide range of power regulation.
Specifically, the fuzzy logic controller of the present invention utilizes E1 and E2 as linguistic variable inputs, where E1 ═ P 0 -P(k))/P 0 ，E2＝(F 0 -F(k))/F 0 ，F 0 To set the frequency, F (k) is the operating frequency. And, the fuzzy logic controller also adopts the following fuzzy rule base:
by means of the control unit, the PID controller and the fuzzy logic controller are organically combined, the duty ratio of the power signal of the ultrasonic generator is adjusted by means of the fuzzy logic controller to achieve large-range adjustment of power, meanwhile, the PID controller is used for accurately adjusting the output power signal, the power adjusting range can be enlarged under the condition that no hardware change is required, the adjusting precision is improved, and the power output is stabilized to avoid unnecessary damage to an electrode band or a diaphragm in the dust removal process. For example, in one example of the control unit of the present invention, the power adjustment range may be extended from 466.9-1200W to 66.2-1200W, while the power adjustment step size may be reduced from 5.96W to 1.06W.
With continued reference to fig. 1, the polar belt or the diaphragm acted on by the first ultrasonic dust removal unit will continue to advance under the action of the rotating roller to reach the vicinity of the second rotating roller.
A second ultrasonic dust removal unit 4 may be disposed above the second rotating roller 2 for performing a second-stage dust removal process on the polar belt or the diaphragm by means of ultrasonic vibration formed by compressed air.
As shown in fig. 1, the second ultrasonic dust removing unit 4 may include a first air inlet 41, a second air inlet 42, a spiral air passage, an air chamber, an air outlet 43, and a dust suction port 44.
The first and second inlet ports 41/42 are for admitting first and second compressed air streams having first and second pressures, respectively, wherein the first and second pressures have a predetermined pressure differential therebetween.
The first and second compressed air flows enter the air chamber through the spiral air passages respectively, wherein the first and second compressed air flows entering the air chamber have spiral rotation under the action of the spiral air passages and resonate at the air outlet of the air chamber, so that high-frequency ultrasonic waves are generated.
The high frequency ultrasonic waves formed at the air outlet of the air chamber act on the surface of the polar band or the diaphragm to cause the dust attached to the polar band or the diaphragm to fall off, and the separated dust is sucked into the dust collector 45 through the dust suction port 44.
In the second ultrasonic dust removal unit, high-frequency ultrasonic signals can be generated by means of air resonance, and the ultrasonic signals act together with the compressed air flow, so that the dust removal treatment can be carried out on the surface of the polar band or the diaphragm more comprehensively, and higher cleanliness can be realized on the surface of the polar band or the diaphragm.
In summary, in the ultrasonic dust removing apparatus of the present invention, a two-stage dust removing structure is proposed, in which a certain degree of cleanliness is obtained on the pole band or the diaphragm by means of direct contact vibration in the first stage dust removing structure, and then a deeper dust removing process is provided for the pole band or the diaphragm by means of a combination of air flow and ultrasonic vibration in the second stage dust removing structure, which is not suitable for being directly used for a workpiece with more dust, and finally a comprehensive dust removing process is provided for the pole band or the diaphragm in an efficient and safe manner, providing the pole band or the diaphragm with high degree of cleanliness. The power control strategy particularly proposed in the first-stage dust removal structure provides great promotion for the application and popularization of the ultrasonic dust removal technology in the lithium battery industry.
Although the present invention has been described in connection with the embodiments illustrated in the accompanying drawings, it will be understood by those skilled in the art that the embodiments described above are merely exemplary for illustrating the principles of the present invention and are not intended to limit the scope of the present invention, and that various combinations, modifications and equivalents of the above-described embodiments may be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (7)
1. The utility model provides a lithium electricity trade high frequency ultrasonic wave dust collector, its includes first rotatory roller, the rotatory roller of second, first supersound dust removal unit and second supersound dust removal unit, wherein:
the first rotating roller is used for driving the polar belt or the diaphragm to move and is arranged to change the polar belt or the diaphragm from vertical movement to horizontal movement;
the first ultrasonic dust removal unit is arranged at the downstream of the first rotating roller, is arranged to enable the horizontal movement direction of the polar belt or the diaphragm to be turned by 180 degrees, and carries out primary dust removal treatment on the polar belt or the diaphragm in a direct contact vibration mode;
the second rotating roller is used for driving the polar belt or the diaphragm to move and is arranged at the downstream of the first ultrasonic dust removal unit;
the second ultrasonic dust removal unit is arranged near the second rotating roller and is used for carrying out secondary dust removal treatment on the polar belt or the diaphragm by utilizing gas and ultrasonic signals generated by the resonance of the gas;
the first ultrasonic dust removal unit comprises a first ultrasonic generator, a second ultrasonic generator, a vibration element and a control unit;
the first and second ultrasonic generators are arranged to generate ultrasonic signals according to control signals of the control unit, and each include a piezoelectric transducer and an amplitude transformer;
the vibrating element is in a hollow cylindrical shape;
the first ultrasonic generator and the second ultrasonic generator are fixedly connected to the outer side surface of the vibration element in an acoustic coupling mode through amplitude transformer rods, wherein a preset angle is formed between the amplitude transformer rods of the first ultrasonic generator and the second ultrasonic generator, and the preset angle is 15-20 degrees;
the piezoelectric transformer includes electrodes for receiving an excitation signal, a plurality of piezoelectric ceramic ring elements sandwiched in a stacked manner between the electrodes, front and rear portions for pressing the piezoelectric ceramic ring elements, and a bolt portion and a nut for integrally connecting the piezoelectric ceramic ring elements, the front and rear portions;
the amplitude transformer has a circular shape with a diameter gradually changed in the longitudinal directionCross section S (x), and cross section S (x) satisfies the following relationship in the longitudinal direction with the input end as a zero point: s (x) = S 1 *e -A*x Wherein S is 1 For the cross-sectional area at the input, coefficient A =
D1 and D2 are the diameters of the input end and the output end, respectively, and L is the longitudinal length of the horn;
the control unit is arranged to send control signals to both the first and second sonotrodes for alternately operating the sonotrodes in a first and a second operating condition, wherein: in the first working state, applying an excitation signal to the first ultrasonic generator, and simultaneously enabling the second ultrasonic generator to generate short circuit; in the second working state, the first ultrasonic generator is short-circuited, and an excitation signal is applied to the second ultrasonic generator;
and there is a 90 degree phase difference between the excitation signal applied to the first ultrasonic generator in the first operating condition and the excitation signal applied to the second ultrasonic generator in the second operating condition.
2. The high-frequency ultrasonic dust removing device according to claim 1, wherein the first ultrasonic dust removing unit further comprises a vacuum cover provided to cover a contact area of the vibrating element with respect to the pole piece or the diaphragm for sucking the detached dust.
3. The high frequency ultrasonic dust removing device according to claim 2, wherein the control unit further comprises an AC/DC converter, a pulse density modulation driver, a transformer, and a control assembly;
the control assembly includes a fuzzy logic controller configured to control an output duty cycle of the ultrasonic generator to provide a wide range of power adjustments and a PID controller configured to provide a fine power adjustment.
4. The high-frequency ultrasonic dust removing device according to claim 3, wherein the output U of the PID controller PID Is configured to:
U PID (k)=U integration (k)+U Differentiation of (k)+U Ratio of （k）
U Integration (k)=
An integration unit output of the PID controller;
U differentiation of (k)=
A derivative unit output of the PID controller;
U ratio of (k)=
A proportional unit output of the PID controller;
power deviation P E (k)= P(k)-P 0 P (k) is the actual power value at time k, P 0 Is a set power value; i is an integral variable between 0 and k; kc is the controller gain; ti is the integration time and Td is the differentiation time.
5. The high frequency ultrasonic dust removal device of claim 4, wherein the fuzzy logic controller is arranged to control the output duty cycle of the ultrasonic generator according to a power error rate E1 and a frequency error rate E2, E1= (P) 0 -P(k))/P 0 ，E2=(F 0 -F(k))/F 0 ，F 0 F (k) is the working frequency for setting frequency;
and the fuzzy logic controller is further configured to obfuscate the rule base using the graph as described above.
6. The high-frequency ultrasonic dust removing device according to claim 5, wherein the second ultrasonic dust removing unit comprises a first air inlet, a second air inlet, a spiral air passage, an air chamber, an air outlet and a dust suction port;
the first air inlet is used for introducing a first compressed air flow with a first pressure, the second air inlet is used for introducing a second compressed air flow with a second pressure, and a preset pressure difference exists between the first pressure and the second pressure;
the helical air passage for directing the first and second flows of compressed air into the air chamber;
the outlet port is arranged in the vicinity of the polar band or diaphragm so that a high-frequency ultrasonic signal generated by the first and second flows of compressed air and their resonance acts on the surface of the polar band or diaphragm;
the suction opening is arranged to suck dust detached from the surface of the pole belt or diaphragm.
7. The high-frequency ultrasonic dust removing device according to claim 6, wherein the second ultrasonic dust removing unit further comprises a dust collector for collecting dust from the dust suction port.
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| DE10135658B4 (en) * | 2001-07-21 | 2005-03-17 | Stranz, Andreas H., Dipl.-Ing.(FH) | Method and device for cleaning the surface of a rotating body |
| US20090232977A1 (en) * | 2005-11-21 | 2009-09-17 | Konica Monolta Opto, Inc. | Optical Film Treating Method, Optical Film Treating Apparatus, and Optical Film Producing Method |
| CN105729675A (en) * | 2016-02-26 | 2016-07-06 | 哈尔滨工业大学 | Ultrasonic continuous modified production equipment for fiber resin pre-impregnated composite material |
| CN207222491U (en) * | 2017-04-29 | 2018-04-13 | 南京国轩电池有限公司 | A kind of bugduster apparatus for rectangular lithium ion battery pole piece |
| CN109732411A (en) * | 2019-01-16 | 2019-05-10 | 上海理工大学 | The device and its application method of cutting monocrystalline silicon are assisted using lateral ultrasonic vibration |
| CN209374605U (en) * | 2019-02-26 | 2019-09-10 | 无锡先导智能装备股份有限公司 | Dust-extraction unit and up- coiler |
| CN210614553U (en) * | 2019-05-29 | 2020-05-26 | 合肥国轩高科动力能源有限公司 | Lithium battery pole piece dust collector |
| CN112354969B (en) * | 2020-09-25 | 2022-09-13 | 昆山市生力包装材料有限公司 | Paper dust removal device |
| CN112588713A (en) * | 2020-12-30 | 2021-04-02 | 中国科学院宁波材料技术与工程研究所 | Contact through type ultrasonic cleaning device |
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2021
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