CN112275728A - Digital full-intelligent ultrasonic generator for pulse jet cleaning and stripping and automatic frequency locking method - Google Patents
Digital full-intelligent ultrasonic generator for pulse jet cleaning and stripping and automatic frequency locking method Download PDFInfo
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- CN112275728A CN112275728A CN202011221083.9A CN202011221083A CN112275728A CN 112275728 A CN112275728 A CN 112275728A CN 202011221083 A CN202011221083 A CN 202011221083A CN 112275728 A CN112275728 A CN 112275728A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
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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
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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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- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention provides a digital full-intelligent ultrasonic generator for pulse jet cleaning and stripping, which comprises: the input power supply voltage regulating and/or stabilizing module is connected with the full-bridge rectifying and filtering module, the full-bridge rectifying and filtering module is connected with the high-frequency inversion module, and the high-frequency inversion module is connected with the ultrasonic source frequency generating module and the impedance matching module; the impedance matching module is connected with the ultrasonic power control module; the microprocessor control module is connected with the ultrasonic source frequency generation module and the automatic scanning frequency locking control module, and the automatic scanning frequency locking control module is connected with the ultrasonic source frequency generation module; the ultrasonic source frequency generation module is connected with the oscillation driving module, the oscillation driving module is connected with the ultrasonic power control module, and the ultrasonic power control module is connected with the ultrasonic output module. The invention also provides an automatic frequency locking method. The device can automatically scan the optimal resonance frequency point of the pulse water jet transducer and the amplitude transformer load, track the change of the resonance frequency point in a full range for self-adaptation, and track the optimal working frequency.
Description
Technical Field
The invention relates to an ultrasonic generator, in particular to a digital full-intelligent ultrasonic generator for pulse jet cleaning and stripping and an automatic frequency locking method.
Background
The ultrasonic generator is an important component of the pulse water jet cleaning and stripping ultrasonic industrial application equipment, is used for providing ultrasonic frequency electric energy for the ultrasonic transducer and the load of the amplitude transformer, and transfers the pulse mechanical energy to the water jet through the conversion of the electric energy and the mechanical energy loaded by the amplitude transformer, so that the impact force of the water jet is enhanced, and the cleaning and stripping capacity and the efficiency of the water jet are improved in multiples.
At present, an ultrasonic generator utilizing an ultrasonic principle of an analog self-excited oscillation circuit is adopted, the adopted ultrasonic generator circuit is the self-excited oscillation circuit used in the last 90 th century, and in order to enable an ultrasonic amplitude transformer to work under the optimal frequency and exert the superiority of ultrasonic pulse resonance water jet machining, a transducer vibration system is required to work in the optimal resonance state. Before the analog ultrasonic generator and transducer vibration system works, the electric frequency of a power supply needs to be adjusted to meet the working condition that the system is in resonance. However, in the actual cleaning and stripping operation, the natural frequency of the vibration system changes due to the influence of a series of factors such as the load change of the spray head, water jet pressure, flow rate, target distance, system heating and the like, and if the electrical frequency of the transducer is not adjusted in time, the vibration system works in a non-resonance state, so that the output amplitude of the vibration system is reduced, the cleaning and stripping quality is influenced, the working efficiency is reduced, and when the detuning is serious, the ultrasonic equipment is damaged and the substrate of the cleaned and stripped workpiece is damaged. Therefore, the circuit mainly has the following defects: 1. the working frequency of the machine needs to be adjusted again each time the water jet nozzle, the amplitude transformer, the water jet pressure and the like are replaced (because the frequency of each manufactured amplitude transformer has deviation, the working frequency of the ultrasonic generator needs to be manually adjusted to be the same as the working frequency of the machine equipment), the use and the operation are inconvenient, and an operator needs to have certain working experience and technical level; 2. the amplitude power is small, the stability is poor, the failure rate is high, and the maintenance rate is high; 3. the electric energy and mechanical energy conversion efficiency is low, and the loss is large.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a digital full-intelligent ultrasonic generator for pulse jet cleaning and stripping and a corresponding automatic frequency locking method, which can automatically scan the optimal resonance frequency point of a pulse water jet transducer and a horn load, track the change of the resonance frequency point in a full range for self-adaptation and self-adjustment, track the optimal working frequency, ensure that the frequency locking is more accurate, ensure that the ultrasonic transducer and the horn load can work in a resonance state according to the water jet characteristics, improve the conversion efficiency of the pulse jet cleaning and stripping ultrasonic transducer, and ensure that a circuit can work more stably and efficiently. The embodiment of the invention adopts the technical scheme that:
in a first aspect, an embodiment of the present invention provides a digital full-intelligent ultrasonic generator for pulse jet cleaning and stripping, including:
the device comprises an input power supply voltage regulating and/or stabilizing module, a microprocessor control module, a full-bridge rectification filtering module, a high-frequency inversion module, an ultrasonic source frequency generating module, an automatic scanning frequency locking control module, an oscillation driving module, an impedance matching module, an ultrasonic power control module and an ultrasonic output module;
the input power supply voltage regulating and/or stabilizing module is connected with the full-bridge rectification filter module, the full-bridge rectification filter module is connected with the high-frequency inversion module, and the high-frequency inversion module is connected with the ultrasonic source frequency generating module and the impedance matching module; the impedance matching module is connected with the ultrasonic power control module; the microprocessor control module is connected with the ultrasonic source frequency generation module and the automatic scanning frequency locking control module, and the automatic scanning frequency locking control module is connected with the ultrasonic source frequency generation module; the ultrasonic source frequency generation module is connected with the oscillation driving module, the oscillation driving module is connected with the ultrasonic power control module, and the ultrasonic power control module is connected with the ultrasonic output module.
Furthermore, the ultrasonic output module is used for connecting a transducer, and the transducer is connected with an amplitude transformer load; the horn load is mounted in the showerhead.
Furthermore, the microprocessor control module comprises a microprocessor, an online communication circuit and a PLC peripheral signal interface circuit, wherein the online communication circuit and the PLC peripheral signal interface circuit are connected with the microprocessor.
Further, the microprocessor control module also comprises a display circuit and a button circuit which are connected with the microprocessor.
In a second aspect, an embodiment of the present invention further provides an automatic frequency locking method, which is suitable for the digital fully-intelligent ultrasonic generator for pulse jet cleaning and stripping as described above,
the method comprises the following steps: the pulse jet broadband rapid frequency scanning method specifically comprises the following steps:
scanning at a specific frequency scanning step length according to the pulse jet transducer and the amplitude transformer load within the maximum working frequency range allowed by the system with the expected natural frequency, and sampling current/voltage data of a resonant loop; removing different sampling points from the sampled data by using a mathematical analysis method, smoothing the data by using a moving average method, and finally obtaining a data curve inflection point by using a mathematical analysis principle that a first-order derivative is zero; the maximum value point of the inflection point data absolute value obtained by comparing the inflection point data is the resonance frequency point, and the microprocessor control module memorizes and stores the resonance frequency point parameter, transmits the resonance frequency point parameter to the automatic scanning frequency locking control module, and works at the resonance frequency point.
Further, the method further comprises: the pulse jet narrow-frequency precise frequency scanning method specifically comprises the following steps:
taking a resonant frequency point obtained by pulse jet broadband rapid frequency scanning as a reference parameter, tracking a step length at a specific frequency within an expected maximum frequency drift range when a system works, and sampling current/voltage data of a resonant loop; removing different sampling points from the sampled data by using a mathematical analysis method, smoothing the data by using a moving average method, and finally obtaining a data curve inflection point by using a mathematical analysis principle that a first-order derivative is zero; the maximum value point of the inflection point data absolute value obtained by comparing the inflection point data is the resonance frequency point, and the microprocessor control module memorizes and stores the resonance frequency point parameter, transmits the resonance frequency point parameter to the automatic scanning frequency locking control module, and works at the resonance frequency point.
The invention has the advantages that:
(1) a stabilized voltage supply device and a voltage regulating device are adopted, and a stable power supply which is adaptive to the pulse water jet transducer and the load regulation of the amplitude transformer can be adopted to provide a stable power supply for the ultrasonic generator;
(2) the full-digital intelligent control is realized by adopting the microprocessor control module, the transducer and the amplitude transformer load working resonant frequency can be automatically scanned to find the optimal resonant frequency stationary point for working, the frequency is automatically tracked, the resonant frequency can be accurately found, the resonant frequency is tracked in the full range for working, and the working efficiency and the stability of the ultrasonic generator are greatly improved;
(3) a communication interface, a microprocessor signal interface and the like are reserved, so that the system can conveniently work with peripheral intelligent robots and other automation equipment in an online manner; the output current conversion can be sampled in real time, the output power can be automatically adjusted, and the output power can be kept basically constant.
Drawings
Fig. 1 is a schematic structural composition diagram of an embodiment of the present invention.
Fig. 2 is a flow chart of automatic frequency locking in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, a digital full-intelligent ultrasonic generator for pulse jet cleaning and peeling according to an embodiment of the present invention includes:
the device comprises an input power supply voltage regulating and/or stabilizing module, a microprocessor control module, a full-bridge rectification filtering module, a high-frequency inversion module, an ultrasonic source frequency generating module, an automatic scanning frequency locking control module, an oscillation driving module, an impedance matching module, an ultrasonic power control module and an ultrasonic output module;
the input power supply voltage regulating and/or stabilizing module is connected with the full-bridge rectification filter module, the full-bridge rectification filter module is connected with the high-frequency inversion module, and the high-frequency inversion module is connected with the ultrasonic source frequency generating module and the impedance matching module; the impedance matching module is connected with the ultrasonic power control module; the microprocessor control module is connected with the ultrasonic source frequency generation module and the automatic scanning frequency locking control module, and the automatic scanning frequency locking control module is connected with the ultrasonic source frequency generation module; the ultrasonic source frequency generation module is connected with the oscillation driving module, the oscillation driving module is connected with the ultrasonic power control module, and the ultrasonic power control module is connected with the ultrasonic output module;
the ultrasonic output module is used for connecting an energy converter, and the energy converter is connected with an amplitude transformer load; the amplitude transformer is loaded and arranged in the spray head;
the microprocessor control module comprises a microprocessor, an online communication circuit and a PLC peripheral signal interface circuit, wherein the online communication circuit and the PLC peripheral signal interface circuit are connected with the microprocessor; the microprocessor control module also comprises a display circuit and a button circuit which are connected with the microprocessor;
the microprocessor control module controls the ultrasonic source frequency generating module to generate an ultrasonic source frequency signal, the source frequency signal is processed by the oscillation driving module and then output to the ultrasonic power control module, and then the ultrasonic power control module outputs the ultrasonic source frequency signal to the ultrasonic output module;
the input power supply voltage regulating and/or stabilizing module can regulate a corresponding stable power supply according to the load of the pulse water jet transducer and the amplitude transformer and provide a stable power supply for the ultrasonic generator;
in one embodiment, the automatic frequency locking method comprises the following steps: the pulse jet broadband rapid frequency scanning method specifically comprises the following steps:
scanning at a specific frequency scanning step length according to the pulse jet transducer and the amplitude transformer load within the maximum working frequency range allowed by the system with the expected natural frequency, and sampling current/voltage data of a resonant loop; removing different sampling points from the sampled data by using a mathematical analysis method, smoothing the data by using a moving average method, and finally obtaining a data curve inflection point by using a mathematical analysis principle that a first-order derivative is zero; the maximum value point of the absolute value of the inflection point data obtained by comparing the inflection point data is a resonance frequency point, and the microprocessor control module memorizes and stores the resonance frequency point parameter, transmits the resonance frequency point parameter to the automatic scanning frequency locking control module and works at the resonance frequency point;
wherein the resonance loop is a resonance loop in the amplitude transformer load;
the specific implementation steps are as follows:
measuring the resonance frequency (namely the natural frequency) of the transducer and the load of the amplitude transformer, and setting the initial power supply voltage and the frequency range according to the natural frequency of the transducer and the load of the amplitude transformer;
secondly, setting the frequency from the minimum value by the microprocessor control unit according to the natural frequency range of the transducer and the load of the amplitude transformer;
gradually increasing the frequency, stabilizing the time T after each frequency is increased, generating the frequency by the ultrasonic source frequency generation module after the time T, and then sampling the current/voltage data of the resonant loop loaded by the corresponding amplitude transformer;
step four, the microprocessor control module automatically records corresponding voltage values and current values, obtains resonant frequency points after the processing of the microprocessor control module data, and transmits the resonant frequency points to the automatic scanning frequency locking control module; then the ultrasonic wave is transmitted to the transducer and the load of the amplitude transformer through the ultrasonic output module;
in another embodiment, the automatic frequency locking method further comprises: the pulse jet narrow-frequency precise frequency scanning method specifically comprises the following steps:
taking a resonant frequency point obtained by pulse jet broadband rapid frequency scanning as a reference parameter, tracking a step length at a specific frequency within an expected maximum frequency drift range when a system works, and sampling current/voltage data of a resonant loop; removing different sampling points from the sampled data by using a mathematical analysis method, smoothing the data by using a moving average method, and finally obtaining a data curve inflection point by using a mathematical analysis principle that a first-order derivative is zero; the maximum value point of the inflection point data absolute value obtained by comparing the inflection point data is the resonance frequency point, and the microprocessor control module memorizes and stores the resonance frequency point parameter, transmits the resonance frequency point parameter to the automatic scanning frequency locking control module, and works at the resonance frequency point.
When the ultrasonic wave device is applied, the pulse jet flow broadband fast-step frequency scanning is used for the first use of ultrasonic equipment or the use of the ultrasonic wave configuration when the ultrasonic wave configuration is changed greatly; the pulse jet narrow-frequency precise frequency scanning is used when the ultrasonic equipment is started every time.
The digital intelligent ultrasonic generator for pulse jet cleaning and stripping and the automatic frequency locking method provided by the invention can accurately find the optimal resonance point of the ultrasonic transducer load, thereby improving the performance of the product.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (6)
1. A digital full-intelligent ultrasonic generator for pulse jet cleaning and stripping is characterized by comprising:
the device comprises an input power supply voltage regulating and/or stabilizing module, a microprocessor control module, a full-bridge rectification filtering module, a high-frequency inversion module, an ultrasonic source frequency generating module, an automatic scanning frequency locking control module, an oscillation driving module, an impedance matching module, an ultrasonic power control module and an ultrasonic output module;
the input power supply voltage regulating and/or stabilizing module is connected with the full-bridge rectification filter module, the full-bridge rectification filter module is connected with the high-frequency inversion module, and the high-frequency inversion module is connected with the ultrasonic source frequency generating module and the impedance matching module; the impedance matching module is connected with the ultrasonic power control module; the microprocessor control module is connected with the ultrasonic source frequency generation module and the automatic scanning frequency locking control module, and the automatic scanning frequency locking control module is connected with the ultrasonic source frequency generation module; the ultrasonic source frequency generation module is connected with the oscillation driving module, the oscillation driving module is connected with the ultrasonic power control module, and the ultrasonic power control module is connected with the ultrasonic output module.
2. The digital full-intelligent ultrasonic generator for pulse jet cleaning and stripping according to claim 1,
the ultrasonic output module is used for connecting an energy converter, and the energy converter is connected with an amplitude transformer load; the horn load is mounted in the showerhead.
3. The digital full-intelligent ultrasonic generator for pulse jet cleaning and stripping according to claim 1,
the microprocessor control module comprises a microprocessor, an online communication circuit and a PLC peripheral signal interface circuit, wherein the online communication circuit and the PLC peripheral signal interface circuit are connected with the microprocessor.
4. The digital full-intelligent ultrasonic generator for pulse jet cleaning and stripping according to claim 3,
the microprocessor control module also comprises a display circuit and a button circuit which are connected with the microprocessor.
5. An automatic frequency locking method, which is suitable for the digital full-intelligent ultrasonic generator for pulse jet cleaning and stripping as claimed in any one of claims 1-4,
the method comprises the following steps: the pulse jet broadband rapid frequency scanning method specifically comprises the following steps:
scanning at a specific frequency scanning step length according to the pulse jet transducer and the amplitude transformer load within the maximum working frequency range allowed by the system with the expected natural frequency, and sampling current/voltage data of a resonant loop; removing different sampling points from the sampled data by using a mathematical analysis method, smoothing the data by using a moving average method, and finally obtaining a data curve inflection point by using a mathematical analysis principle that a first-order derivative is zero; the maximum value point of the inflection point data absolute value obtained by comparing the inflection point data is the resonance frequency point, and the microprocessor control module memorizes and stores the resonance frequency point parameter, transmits the resonance frequency point parameter to the automatic scanning frequency locking control module, and works at the resonance frequency point.
6. The automatic frequency locking method of claim 5,
the method further comprises the following steps: the pulse jet narrow-frequency precise frequency scanning method specifically comprises the following steps:
taking a resonant frequency point obtained by pulse jet broadband rapid frequency scanning as a reference parameter, tracking a step length at a specific frequency within an expected maximum frequency drift range when a system works, and sampling current/voltage data of a resonant loop; removing different sampling points from the sampled data by using a mathematical analysis method, smoothing the data by using a moving average method, and finally obtaining a data curve inflection point by using a mathematical analysis principle that a first-order derivative is zero; the maximum value point of the inflection point data absolute value obtained by comparing the inflection point data is the resonance frequency point, and the microprocessor control module memorizes and stores the resonance frequency point parameter, transmits the resonance frequency point parameter to the automatic scanning frequency locking control module, and works at the resonance frequency point.
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| CN202011221083.9A CN112275728A (en) | 2020-11-05 | 2020-11-05 | Digital full-intelligent ultrasonic generator for pulse jet cleaning and stripping and automatic frequency locking method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114147010A (en) * | 2021-11-26 | 2022-03-08 | 国网四川省电力公司映秀湾水力发电总厂 | Pipeline inner wall ultrasonic cleaning system capable of automatically tracking frequency |
| CN114189164A (en) * | 2021-12-08 | 2022-03-15 | 浙江华章科技有限公司 | Head box valve cleaning control system |
| CN115463895A (en) * | 2022-09-19 | 2022-12-13 | 深圳市得康洗净电器有限公司 | Ultrasonic cleaner data cloud platform and cleaning equipment thereof |
-
2020
- 2020-11-05 CN CN202011221083.9A patent/CN112275728A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114147010A (en) * | 2021-11-26 | 2022-03-08 | 国网四川省电力公司映秀湾水力发电总厂 | Pipeline inner wall ultrasonic cleaning system capable of automatically tracking frequency |
| CN114147010B (en) * | 2021-11-26 | 2023-06-09 | 国网四川省电力公司映秀湾水力发电总厂 | Pipeline inner wall ultrasonic cleaning system capable of automatically tracking frequency |
| CN114189164A (en) * | 2021-12-08 | 2022-03-15 | 浙江华章科技有限公司 | Head box valve cleaning control system |
| CN114189164B (en) * | 2021-12-08 | 2023-10-27 | 浙江华章科技有限公司 | Head box valve washs control system |
| CN115463895A (en) * | 2022-09-19 | 2022-12-13 | 深圳市得康洗净电器有限公司 | Ultrasonic cleaner data cloud platform and cleaning equipment thereof |
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