As we all know, ultrasonic washing machine division by two deer one ultrasonic generator, the transducer is at the core of the ultrasonic cleaning tank.
Ultrasonic generator that is simple with a transducer frequency of high-power source to match.
In general, the ultrasonic generator and transducer at the core of the ultrasonic cleaning tank, and its technical condition is far behind the times the cause of China's economic development and the needs of many fields. Ultrasonic cleaner production technology is characterized by outdated, cleaning efficiency is not satisfactory, the high failure rate. This has become a constraint to further expand its scope of application of the bottleneck. Is not currently on the market in order to enhance technology, improve the design, simplifying the process structure, reduce costs and improve its cost-effective as the guide, but often low-cost competition, which the industry as a whole and the development of ultrasonic cleaning has a negative negative impact, it should be causing us some concern.
As far as we know, in eastern China, ultrasonic generator standard of no more than the following:
1, the first generation of products are tube-style, with technological advances, has been a fall-out products (manufacturers still in production).
2, the United States will be able to imitate the ultrasonic signal generator, single-power 300W, frequency is fixed at 25KHz (Self-excited half-bridge output circuit), with a large power transformers, the largest share of the market share of a simple model . However, the circuit is difficult to adjust in the best ultrasonic transducer resonant frequency point, the output power can not achieve the desired results, it goes without saying that the quality of the. However, taking into account the lines of the generator is relatively simple, stable, fair, good debugging machine, or a very low failure rate, combined with the production of such small and medium-sized models of ultrasonic washing machine enterprises, whether its to improve and enhance the lines? We provide a design for the following reference: remove the power transformer, the output matching transformer to reduce magnetic flux leakage, to reduce to reduce the machine weight and volume, reduce costs, improve efficiency purposes. To remove the power transformer, we must first solve two problems to consider, first, high-frequency power input and power output of the insulation between the issues: the second is to reduce the supply voltage for high-power tube voltage value of the normal work can be to ensure the safe operation of machines (the same plane about the supply voltage between DC150V-180V). Figure 1 describes the circuit supply voltage can be solved in line with the original machine design requirements. Note: When debugging security, to prevent electric shock.
The original choice of machine output transformer core is a single, larger magnetic flux leakage, once near the iron shell, will form a vortex, resulting in high heat, it is recommended to use IE core, coil around by a single group for the beginning of change, sub-two-winding, this can be resolved on the high-frequency power input and power output between the problem of isolation and insulation. Output transformer of the technical parameters such as turns and turns than the initial level and the inductance due to many uncertainties, it is difficult to give a firm data.
3, MC models and the improved models: This is an old product, and circuit design cumbersome, due to historical reasons, is a product design in place. Gate with a much, SCR regulator, chaotic process, the high failure rate, users have been left out in the cold, the production of such well-known models of the former state-owned companies, we believe that the only pain to get rid of the backwardness of the old models, the development or the use of new models to former glory, and is based on today's market.
Improved models, simplifying the circuit, an increase of "frequency hopping" synchronous technology, the so-called "frequency hopping" is in fact the main vibration frequency PWM, the increase in more than a harmonic oscillator, its frequency and frequency match, The oscillator output pulse again extremely vibration modulation. Although a constant power output to achieve, but the current capacity of power MOSFET devices restrictions, there is no power output to achieve full output power is satisfactory, cleaning efficiency is no significant increase in the application of the industry does not face width, in particular, for each jump frequency cycle, there will always be cyclical cleaning cylinder sound, there is no slow-start function and a "transfer credit" knob, errors will occur once the operation fails, and other equipment can not be linked to achieve control. The reason MC does not jump out of the original frame design models and ideas, although the replacement of the original dedicated controller chip, it is regrettable that the new chip features have not been fully used.
The models in eastern China, only a small number of enterprises in production, if further improvements will be a change of power components for the IGBT, machine capacity can be expanded to remove the cylinder sound cyclical, with the new chip, the PWM control All features, such as slow-start function and PWM function, which is very convenient to achieve "one-touch operation" (only a power switch) is, after all, a good model.
4, IGBT power components for use in ultrasonic generator has attracted wide attention and application, but some products of view, still not out of the traditional ideas and methods of design, for example, simply push the two components, such as : EXB840/841, is a rectangular shaped flat piece of thick-film integrated circuit packaging, and circuit size and cost accounts for a significant proportion, it is necessary to know that a single ultrasonic generator power requirements can not be great enough . Of course, as with high-frequency IGBT power components, because of its high-voltage, large capacity, high input impedance, small pressure drop, the preferred course, this is a step forward.
5, IGBT constant power ultrasonic washing machine:
This is a new generation of popular current international power electronic components - IGBT (insulated gate bipolar transistor a high power module) for the high-frequency power devices, military-grade control of Application Specific Integrated Chip (PWM instead of CPU) and has the independent intellectual property rights innovative circuit, with high-performance combination of transducers, modular design, building-block process to install a new generation of ultrasonic cleaning machines.
It has three notable features: A: constant power output. The so-called "constant power" that is in the cleaning tank, the water level in different heights and different sizes of the workpiece is cleaned, the cleaning efficiency unchanged. (Reflecting the same power output) to a stable, efficient, long life and so on.
To achieve constant power output, the only way is the use of the frequency of automatic tracking circuit to achieve, the professional journal of the experts on this forum also discussed the recent and analysis, and introduced a wide range of frequency tracking circuit, it is regrettable that most of theory a pass, but the technology difficult to achieve. So the frequency of track circuit to be practical, simple, low-cost. It is impossible for the formation of the industrialized products.
B: The second feature of the aircraft can be made adequate <99 ℃ of temperature models in the industry is no small breakthrough.
C: Process of simplicity, is the third feature of the aircraft. Three parts, the composition can be adapted to a variety of different frequency and power of ultrasonic power generator, simple and reliable means, and the use of low cost and easy maintenance.
A good ultrasonic power generator similar to a good transducer (tank cleaning) to match, otherwise it will be difficult to achieve the desired results. Transducer (ultrasonic oscillator) in the ultrasonic cleaning machine
Plays a very important role, is a key component of the implementation agencies. General production in the current small and medium-sized enterprises ultrasonic washing machine, the transducer products are purchased, do not pay attention to its quality, or ability to test nuclear devices of its main technical parameters, such as the size of impedance, frequency, consistency, etc. and so on, uncertainty, bought with the machine on which the efficiency of the whole, the quality of life hidden seeds. Further said that even if the test is generally a low-power technology of detection, it is difficult to truly reflect the actual work of the technical parameters. To this end, according to our production of transducers for many years of experience and lessons, summed up the production of a complete transducer technology, coupled with their own R & D of high-power transducer tester, analog transducer to detect the actual the real work of the technical parameters, such as 20Ω impedance are controlled in the following, to maintain the consistency of the frequency of more than 90%, from the source to ensure the quality of the product.
Based on past experiences and lessons, piezoelectric ceramic transducer in the workplace occurred in the chip can easily break down, very easy to off-chip wiring easy mechanism Take off welding type (these are the industry has been a common problem), the occurrence of the above study of its failure The reasons for the transducer itself quality, mainly because there is no good power generator tracking transducer at work because of the water level, temperature, changes in the size of the workpiece to affect change in their frequency between the two in detuning of the results of the state.
In this regard, the frequency of the automatic tracking is particularly important. Will not be another reason for people to ignore, it is more than cylinder transducer at work do not have the same frequency of the anti-peak voltage, have not been effective in containing the consequences.
In addition to the ultrasonic generator, the output of the high-frequency transducer is a voltage level of an important parameter, but can not be considered "different circuits of the ultrasonic generator, the output circuits, voltage led the different feet of the important reasons for the spread of efficiency," "low output voltage, on generator power consumption, and at the same time oscillator is also easier to heat, resulting in the induced electric field, and appropriate adjustments to the circuit, increasing the output voltage to the oscillator may be achieved very good results. "
We believe that the term open to question, explore generator to the transducer output voltage level of the full impact of the efficiency of an important reason, but it is not a fixed parameter, according to the frequency of the transducer and transducer level the number of devices (power) to make corresponding adjustments to the high-frequency transducer is voltage corresponding to low and low frequency transducer, the same should be a corresponding increase in voltage. In addition, Oscillator One major factor in heat generator oscillator frequency and the actual resonant frequency detuning in the state, and the other is the output of generator and load impedance of the oscillator does not match the overall impedance. If you meet the above two conditions, that is, losing both harmonic frequency, and impedance match, and that efficiency is the best state of the lowest temperature rise. If the output voltage would simply increase the possibility of increased power consumption caused by heat oscillator.
The good news is that constant power ultrasonic washing machine, through the tireless efforts of the past five years, the innovative "all-frequency, real-time" automatic tracking circuit and non-general process, the successful solution of these problems. Heating models have more than one security in the foreign-funded enterprises have been running trouble-free for nearly three years. It can be said that ultrasonic washing machine constant power to the entire industry has been a spring.
Second, ultrasonic cleaning machines for the production of recommendations
1, introduction of industry standards as soon as possible to clean up the market --- Ultrasonic Cleaning Machine
There is no denying that by the past, the impact of the planned economic system, in all walks of life leave a lot of side effects, the industry is no exception. For example, a certain well-known state-owned companies, although a half years ago as a limited reform, but the mechanism is still functioning there are no major changes, or before the old, more than ten years time or even a 50W ultrasonic washing machine also failed to develop out. Together with the old system obsolete products is that it's fatal, it is sad and regrettable, the reasons for which are also thought-provoking.
Today, the rapid development of socialist market economy and good environment, a large number of private enterprises have been rising on the Wuxi and the surrounding areas, engaged in the production of ultrasonic nearly more than 100, of which there are many vendors on the grade scale This is a very good thing.
However, we have to clear to see, many enterprises do not have their own ability to develop new products, especially the production of ultrasonic washing machine business, and are based on more than 90% of the "used" and the generic off-the-shelf products, the market The products are all-25KHz old faces. Not product innovation, and pragmatic efforts, but playing a vicious cycle of price wars, and even some from the intrinsic quality of the appearance of the foot can be said that poor quality products to an extremely low price sold, for all to see this phenomenon as well as very dangerous, one can imagine, even if you have good innovative products, in that the external environment, and sometimes it is powerless.
To this end, we call on the ultrasonic washing machine in a wide range of industry-standard based on advice issued as soon as possible so that the business rule-based, there are rules that can make trades in the healthy and orderly path is well. At the same time, hope that product quality supervision departments will
Further standardize the market, severely punished and put an end to substandard, poor-quality products, purification of the market environment for enterprise development in a good space.
2, existing products, there are always room for improvement and innovation in space - Ultrasonic Cleaning Machine
Some small and medium-sized enterprises in the lack of funds and human resources, the products to be updated, technology innovation is easier said than done. We believe that even a small enterprise, as long as there is in the quality of the concept of a correct understanding of the existing product to conduct a recall, in conclusion, find out the hidden dangers or deficiencies, to study, objective scientific analysis, trial and error to improve, this product will be continuously improved. If that itself is the production of generic products, do not blindly believe in that which is perfect, and any product is not perfect, there is always room for improvement and innovation in space.
3, peers should be in-laws - Ultrasonic Cleaning Machine
We are facing is a common cause, is an extremely large market and users, in front of them, we are in agreement.
We sincerely hope that "China Cleaning Engineering Technical Cooperation Association" in the "technology industry research organization, to develop guidance to promote the industry as a whole technological progress ... ..." and so on play a bigger role. We are willing to care and so on, under the premise of reciprocity, in good faith with their peers or people to carry out extensive cooperation and exchanges, for a common purpose, the revitalization of our common cause. |
