CN103558047B - Multi-frequency ultrasonic cleaning effect experimental platform - Google Patents

Abstract

The invention discloses a multi-frequency ultrasonic cleaning effect experimental platform, which includes a core control module, a first relay module, a second relay module, a third relay module, an input isolation module, a power amplification module, a first matching transformer, a second Matching transformers, five ultrasonic signal generating modules, five matching inductances and five transducer arrays; among them, the core control module, its signal output terminal is respectively connected with the ultrasonic signal generating module, the first relay module, the second relay module, the second The control signal input terminals of the three relay modules are connected to each other, and are used to generate corresponding switching control signals according to the input working frequency selection signal and transmit them to the first relay module, the second relay module and the third relay module respectively. The invention can use multiple groups of frequencies to study the cleaning effect of the underwater structure, highlights the effectiveness and contrast of the cleaning effect, and finds out in real time the optimum frequency most suitable for cleaning the underwater structure.

Description

Multi-frequency ultrasonic cleaning effect experimental platform

technical field

The invention relates to a multi-frequency ultrasonic cleaning effect experimental platform, which belongs to the technical field of ultrasonic cleaning.

Background technique

At present, where the dam gate or the dam body is immersed in water for a long time, certain dirt will be deposited on the surface, which will affect its normal function and even damage the equipment. At present, the experience of applying ultrasonic technology to the cleaning of underwater structures is relatively scarce. Although ultrasonic cleaning methods for large underwater equipment have been proposed, most of them use a single ultrasonic cleaning frequency in a specific environment. The physical characteristics, thickness, and hardness of dirt are closely related to the water quality and the characteristics of impurities in the water. It is difficult to meet the engineering requirements for cleaning underwater structures with a single-frequency ultrasonic transducer. On the one hand, due to the inappropriate selection of signal frequency, its cleaning effect will be greatly reduced, and the working time of the ultrasonic transducer needs to be extended, which will increase energy consumption and is not conducive to energy saving and emission reduction. On the other hand, if a single-frequency ultrasonic transducer is used to clean some fragile and easily damaged surface dirt, the cleaned surface will be damaged or damaged. Therefore, according to the surface conditions of different cleaning objects, the physical characteristics, thickness and hardness of dirt, etc., choosing a suitable signal frequency for surface cleaning will improve the cleaning effect of underwater structures, protect the dam body, and prolong the ultrasonic exchange rate. The use time of the energy generator can reduce CO ₂ emissions to have positive significance.

Therefore, it is of great significance for the maintenance and maintenance of water conservancy facilities to develop a surface cleaning device for underwater structures with adaptive features that can be applied to cleaning different surfaces and removing different dirt.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a multi-frequency ultrasonic cleaning effect experimental platform, which can use multiple groups of frequencies to carry out research on the effect of cleaning dirt on underwater structures, highlighting the effectiveness and effectiveness of the cleaning effect and By comparison, find out in real time the optimum frequency that is most suitable for cleaning the dirt of the underwater structure.

In order to solve the above technical problems, the technical solution of the present invention is: a multi-frequency ultrasonic cleaning effect experimental platform, which includes a core control module, a first relay module, a second relay module, a third relay module, an input isolation module, a power amplifier module, a first matching transformer, a second matching transformer, five ultrasonic signal generating modules, five matching inductors and five transducer arrays; wherein,

The core control module, whose signal output terminals are respectively connected to the control signal input terminals of the ultrasonic signal generation module, the first relay module, the second relay module, and the third relay module, are used to select signals according to the input working frequency to generate corresponding switching The control signals are respectively transmitted to the first relay module, the second relay module and the third relay module;

Five ultrasonic signal generating modules, the output ends of which are selectively connected to the input isolation module through the first relay module, respectively, and are used to respectively output ultrasonic driving signals of different frequencies;

The first relay module is used to receive the corresponding switch control signal and selectively connect the corresponding ultrasonic signal generation module and input isolation module;

The input isolation module, the output end of which is connected with the power amplifier module, is used to drive the power amplifier module to work normally;

A power amplification module, the output end of which is selectively connected to the first matching transformer and the second matching transformer through the second relay module;

The second relay module is used to receive the corresponding switching control signal and selectively connect the power amplification module and the corresponding first matching transformer or the second matching transformer;

Five matching inductors, which correspond to the five ultrasonic signal generating modules, and the input ends of three matching inductors are selectively connected to the first matching transformer through the third relay module, and the input ends of the other two matching inductors The third relay module is selectively connected to the second matching transformer respectively, and the output terminals of the five matching inductors are respectively connected to the corresponding transducer arrays, so as to tune and match the corresponding transducer arrays;

The first matching transformer and the second matching transformer are used to change the impedance of the corresponding transducer array to match the impedance of the signal source, so as to ensure that the corresponding transducer array obtains the maximum electric power;

The third relay module is used for receiving the corresponding switching control signal and selectively connecting the corresponding matching inductor and the first matching transformer; it is also used for receiving the corresponding switching control signal and selectively connecting the corresponding matching inductor and the second matching transformer.

Further, the five ultrasonic signal generating modules are respectively the first ultrasonic signal generating module, the second ultrasonic signal generating module, the third ultrasonic signal generating module, the fourth ultrasonic signal generating module and the fifth ultrasonic signal generating module, the The output frequency of the first ultrasonic signal generating module is an ultrasonic driving signal of 20KHz, the output frequency of the second ultrasonic signal generating module is an ultrasonic driving signal of 40KHz, the output frequency of the third ultrasonic signal generating module is an ultrasonic driving signal of 80KHz, and the fourth ultrasonic signal The generating module outputs an ultrasonic driving signal with a frequency of 160KHz, and the fifth ultrasonic signal generating module outputs an ultrasonic driving signal with a frequency of 200KHz.

Further, the five matching inductances are respectively the first matching inductance, the second matching inductance, the third matching inductance, the fourth matching inductance and the fifth matching inductance, the first matching inductance corresponds to the first ultrasonic signal generating module, And its resonant frequency is 20KHz, the second matching inductance corresponds to the second ultrasonic signal generating module, and its resonant frequency is 40KHz, the third matching inductance corresponds to the third ultrasonic signal generating module, and its resonant frequency is 80KHz, the first The four matching inductors correspond to the fourth ultrasonic signal generating module, and their resonance frequency is 160KHz, and the fifth matching inductor corresponds to the fifth ultrasonic signal generating module, and their resonance frequency is 200KHz.

Further, the input isolation module is formed by connecting a drive circuit and an isolation transformer.

Further, the power amplifying module adopts a half-bridge ultrasonic power amplifying circuit.

Furthermore, the energy array is composed of multiple transducers, and each transducer is formed by connecting multiple piezoelectric ceramic sheets in parallel.

After adopting the above-mentioned technical scheme, due to the adoption of self-adaptive technology, five kinds of transducer arrays with different frequency bands (which can be 20kHz, 40kHz, 80kHz, 160kHz and 200kHz) can be used for different underwater structures and different states. The research on the cleaning effect of underwater structures highlights the effectiveness and contrast of the cleaning effect, and the multi-frequency ultrasonic cleaning effect experimental platform of the present invention has the advantages of simple structure, low cost, energy saving, convenient operation, obvious cleaning effect and easy comparison, etc. It is of great significance in the research of ultrasonic cleaning technology.

Description of drawings

Fig. 1 is a functional block diagram of the multi-frequency ultrasonic cleaning effect experimental platform of the present invention.

detailed description

In order to make the content of the present invention more clearly understood, the present invention will be further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

As shown in Figure 1, a multi-frequency ultrasonic cleaning effect experimental platform includes a core control module, a first relay module 1, a second relay module 2, a third relay module 3, an input isolation module, a power amplification module, a first A matching transformer, a second matching transformer, five ultrasonic signal generating modules, five matching inductors and five transducer arrays 4; wherein,

The core control module, its signal output terminal is respectively connected with the control signal input terminal of the ultrasonic signal generation module, the first relay module 1, the second relay module 2, and the third relay module 3, and is used to select the signal generation according to the input working frequency Corresponding switching control signals are respectively transmitted to the first relay module 1, the second relay module 2 and the third relay module 3;

Five ultrasonic signal generating modules, the output ends of which are selectively connected to the input isolation module through the first relay module 1, respectively, and are used to respectively output ultrasonic driving signals of different frequencies;

The first relay module 1 is used to receive the corresponding switch control signal and selectively connect the corresponding ultrasonic signal generation module and input isolation module, thereby selecting the frequency of the ultrasonic drive signal, the common port of the first relay module 1 is connected to the input isolation module, The five selection ports are respectively connected to five ultrasonic signal generating modules, which are controlled by the core control module.

The input isolation module, whose output terminal is connected with the power amplification module, is used for pre-amplifying the ultrasonic driving signal and isolating the ultrasonic signal generation module from the power amplification module, so as to drive the power amplification module to work normally;

A power amplification module, the output end of which is selectively connected to the first matching transformer and the second matching transformer through the second relay module 2, and is used to amplify the power of the ultrasonic driving signal;

The second relay module 2 is used to receive the corresponding switching control signal and select to connect the power amplification module and the corresponding first matching transformer or the second matching transformer; the common port of the second relay module 2 is connected to the power amplification module, two options The ports are respectively connected to the first matching transformer and the second matching transformer, which are controlled by the core control module.

Five matching inductors, which correspond to the five ultrasonic signal generating modules respectively, and the input ends of three matching inductors are selectively connected to the first matching transformer through the third relay module 3 respectively, and the input terminals of the other two matching inductors The terminals are selectively connected to the second matching transformer through the third relay module 3, and the output terminals of the five matching inductors are respectively connected to the corresponding transducer arrays 4 for tuning and matching the corresponding transducer arrays 4 , so that the corresponding transducer array 4 circuits tend to be purely resistive;

The first matching transformer and the second matching transformer are used to change the impedance of the corresponding transducer array 4 to match the impedance of the signal source, so as to ensure that the corresponding transducer array 4 obtains the maximum electric power;

The third relay module 3 is used to receive the corresponding switching control signal and selectively connect the corresponding matching inductor and the first matching transformer; it is also used to receive the corresponding switching control signal and selectively connect the corresponding matching inductor and the second matching transformer .

The core control module uses the MSP430F149 microcontroller as the core, and controls the on-off mode of the three relay modules according to the information input by the buttons, so as to realize the function of selecting the required frequency ultrasonic signal to drive the ultrasonic transducer.

The five ultrasonic signal generating modules are respectively the first ultrasonic signal generating module, the second ultrasonic signal generating module, the third ultrasonic signal generating module, the fourth ultrasonic signal generating module and the fifth ultrasonic signal generating module, the first ultrasonic signal generating module The output frequency of the generation module is an ultrasonic drive signal of 20KHz, the output frequency of the second ultrasonic signal generation module is an ultrasonic drive signal of 40KHz, the output frequency of the third ultrasonic signal generation module is an ultrasonic drive signal of 80KHz, and the output frequency of the fourth ultrasonic signal generation module is The ultrasonic driving signal is 160KHz, and the fifth ultrasonic signal generating module outputs an ultrasonic driving signal with a frequency of 200KHz.

The five matching inductances are the first matching inductance, the second matching inductance, the third matching inductance, the fourth matching inductance and the fifth matching inductance, the first matching inductance corresponds to the first ultrasonic signal generating module, and its resonance frequency is 20KHz, the second matching inductance corresponds to the second ultrasonic signal generation module, and its resonance frequency is 40KHz, the third matching inductance corresponds to the third ultrasonic signal generation module, and its resonance frequency is 80KHz, the fourth matching inductance and the first The four ultrasonic signal generation modules correspond to each other, and their resonance frequency is 160KHz, and the fifth matching inductor corresponds to the fifth ultrasonic signal generation module, and their resonance frequency is 200KHz. The five matching inductors can be made of PQ-28 type bobbin, E-E type ferrite, and silk-covered wire.

The five ultrasonic signal generating modules all have SG3525 chips, and by changing the resistance value of the chip's sixth pin, five kinds of ultrasonic driving signals of 20kHz, 40kHz, 80kHz, 160kHz and 200kHz are generated.

The input isolation module is composed of a drive circuit and an isolation transformer. The input isolation module is composed of a drive circuit with TIP122 chip NPN Darlington power transistor and TIP127 chip PNP Darlington power transistor as the core to achieve the purpose of driving MOSFET. Input isolation module It contains an isolation transformer with PQ-26 type skeleton, E-E type magnetic core, 0.27mm diameter enameled wire winding, and the turn ratio of the primary and secondary coils is 1:1 to avoid the interference of the front and rear circuit signals.

The power amplifying module adopts half-bridge ultrasonic power amplifying circuit to amplify the power of ultrasonic driving signals of five different frequencies to 100W.

The transducer array 4 may be composed of multiple transducers, and each transducer is composed of multiple piezoelectric ceramic sheets connected in parallel. The transducer array 4 of this embodiment is composed of 3×3 transducer arrays, and the center frequencies are 20kHz, 40kHz, 80kHz, 160kHz and 200kHz, respectively, to achieve tuning and matching with the static capacitance C ₀ of the corresponding transducer array 4 . It is used to convert the ultrasonic frequency electrical signal into ultrasonic mechanical vibration, and drive the waterproof shell to vibrate, thereby generating ultrasonic cavitation in water, peeling off the dirt on the structure, and achieving the purpose of cleaning.

The first matching transformer can be a transformer made of PQ-28 type skeleton, E-E type ferrite, and wire-wrapped wire. When the frequency is 20kHz, 40kHz and 80kHz, the back-end corresponding transducer array 4 circuit and the front-end circuit can be realized. impedance matching.

The second matching transformer can be a transformer made of PQ-28 type skeleton, E-E type ferrite, and wire-wrapped wire. When the frequency is 160kHz and 200kHz, the impedance of the corresponding transducer array 4 circuit at the back end and the front-end circuit can be realized. match.

When the frequency of the third relay module 3 is 20kHz, 40kHz and 80kHz, its upper common port is connected to the first matching transformer, and the corresponding three selection ports are respectively connected to the first matching inductance, the second matching inductance, and the third matching inductance. Controlled by the core control module, when the frequency of the third relay module 3 is 160kHz and 200kHz, its lower common port is connected to the second matching transformer, and the corresponding two selection ports are respectively connected to the fourth matching inductor and the fifth matching inductor, which are controlled by the core Control module control.

The working principle of the present invention is as follows:

In the experimental study of five-frequency switchable ultrasonic cleaning, the frequency of the ultrasonic signal for the experiment is selected according to the needs. The frequency of the selected ultrasonic drive signal is set through the core control module, and the core control module controls the corresponding ultrasonic signal generation module and the first relay module 1 to work in coordination, and at the same time controls the second relay module 2 and the third relay module 3 to connect to the corresponding first A matching transformer or a second matching transformer, and a corresponding matching inductance. The ultrasonic signal generation module generates two unipolar square wave signals corresponding to the selected frequency with the same frequency and anti-phase peak value of 5V, which are output to the drive circuit in the input isolation module through the first relay module 1, and the two channels with the same frequency and anti-phase The unipolar square wave signal with a peak value of 5V is amplified and shaped into a bipolar square wave signal with a peak value of 12V. The signal is divided into two channels of same-frequency and anti-phase signals through an isolation transformer with a turn ratio of 1:1 to drive the power connected to it. Zoom in on the module. The output end of the power amplification module is connected to the second relay module 2, and the selection output end of the second relay module 2 selects the first matching transformer or the second matching transformer. The power supply voltage of the power amplification module is 310V, and the first matching transformer and the second matching transformer The matching transformer is used to achieve impedance matching with the transducer array 4, the output end of the first matching transformer is connected to the upper common port of the third relay module 3, and the corresponding selection port is connected to the first matching inductance, the second matching inductance and the third Matching inductance: the output end of the second matching transformer is connected to the lower common port of the third relay module 3 , and the corresponding selection port is connected to the fourth matching inductance and the fifth matching inductance. The core control module will control the second relay module 2 and the third relay module 3 to select and set the signal transmission path, each selection port of the third relay module 3 is connected to each matching inductance, and the corresponding matching inductance and corresponding The transducer array is connected in 4 phases to achieve tuning and matching. The corresponding transducer array 4 converts the input ultrasonic electrical signal into ultrasonic mechanical vibration, so that ultrasonic cavitation effect occurs in the water before and after the transducer array 4, and ultrasonic cleaning is performed on the surface of the object to be cleaned. Change the frequency of the selected ultrasonic wave, repeat the above process, and conduct a targeted exploration of the dirt cleaning effect.

The specific embodiments described above have further described the technical problems, technical solutions and beneficial effects solved by the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Inventions, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (4)

1. The utility model provides a multifrequency ultrasonic cleaning effect experiment platform which characterized in that: the ultrasonic transducer comprises a core control module, a first relay module (1), a second relay module (2), a third relay module (3), an input isolation module, a power amplification module, a first matching transformer, a second matching transformer, five ultrasonic signal generation modules, five matching inductors and five transducer arrays (4); wherein,

the signal output end of the core control module is respectively connected with the control signal input ends of the ultrasonic signal generation module, the first relay module (1), the second relay module (2) and the third relay module (3) and is used for generating corresponding switching control signals according to the input working frequency selection signals and respectively transmitting the corresponding switching control signals to the first relay module (1), the second relay module (2) and the third relay module (3);

the output ends of the five ultrasonic signal generating modules are selectively connected with the input isolation module through the first relay module (1) respectively and are used for outputting ultrasonic driving signals with different frequencies respectively;

the first relay module (1) is used for receiving a corresponding switching control signal and selectively switching on a corresponding ultrasonic signal generation module and an input isolation module;

the output end of the input isolation module is connected with the power amplification module and is used for driving the power amplification module to normally work;

the output end of the power amplification module is selectively connected with the first matching transformer and the second matching transformer through the second relay module (2);

the second relay module (2) is used for receiving the corresponding switching control signal and selectively switching on the power amplification module and the corresponding first matching transformer or second matching transformer;

the five matching inductors are respectively in one-to-one correspondence with the five ultrasonic signal generating modules, the input ends of three matching inductors are respectively selectively connected with the first matching transformer through the third relay module (3), the input ends of the other two matching inductors are respectively selectively connected with the second matching transformer through the third relay module (3), and the output ends of the five matching inductors are respectively connected with the corresponding transducer array (4) and used for tuning and matching the corresponding transducer array (4);

the first matching transformer and the second matching transformer are used for changing the impedance of the corresponding transducer array (4) to enable the impedance to be matched with the source impedance, and the corresponding transducer array (4) is guaranteed to obtain the maximum electric power;

the third relay module (3) is used for receiving corresponding switching control signals and selectively connecting corresponding matching inductors and the first matching transformer; the matching inductor is also used for receiving a corresponding switching control signal and selectively switching on a corresponding matching inductor and a second matching transformer;

the five ultrasonic signal generating modules are respectively a first ultrasonic signal generating module, a second ultrasonic signal generating module, a third ultrasonic signal generating module, a fourth ultrasonic signal generating module and a fifth ultrasonic signal generating module, wherein the first ultrasonic signal generating module outputs an ultrasonic driving signal with the frequency of 20KHz, the second ultrasonic signal generating module outputs an ultrasonic driving signal with the frequency of 40KHz, the third ultrasonic signal generating module outputs an ultrasonic driving signal with the frequency of 80KHz, the fourth ultrasonic signal generating module outputs an ultrasonic driving signal with the frequency of 160KHz, and the fifth ultrasonic signal generating module outputs an ultrasonic driving signal with the frequency of 200 KHz;

the five matching inductors are respectively a first matching inductor, a second matching inductor, a third matching inductor, a fourth matching inductor and a fifth matching inductor, the first matching inductor corresponds to the first ultrasonic signal generation module, the resonance frequency of the first matching inductor is 20KHz, the second matching inductor corresponds to the second ultrasonic signal generation module, the resonance frequency of the second matching inductor is 40KHz, the third matching inductor corresponds to the third ultrasonic signal generation module, the resonance frequency of the third matching inductor is 80KHz, the fourth matching inductor corresponds to the fourth ultrasonic signal generation module, the resonance frequency of the fourth matching inductor is 160KHz, the fifth matching inductor corresponds to the fifth ultrasonic signal generation module, and the resonance frequency of the fifth matching inductor is 200 KHz.

2. The multi-frequency ultrasonic cleaning effect experiment platform of claim 1, wherein: the input isolation module is formed by connecting a driving circuit and an isolation transformer.

3. The multi-frequency ultrasonic cleaning effect experiment platform of claim 1 or 2, wherein: the power amplification module adopts a half-bridge type ultrasonic power amplification circuit.

4. The multi-frequency ultrasonic cleaning effect experiment platform of claim 1, wherein: the transducer array (4) is composed of a plurality of transducers, and each transducer is formed by connecting a plurality of piezoelectric ceramic plates in parallel.