| In modern industrial production processes,factory pipes and heat exchange equipment are affected by chemicals in circulating water,which are easy to generate scale.In the long run,the scale can corrode the heat exchange equipment and reduce the economic benefits of the factory,and even cause industrial security accidents.Therefore,it is particularly important to effectively Anti-scaling and descaling for industrial pipelines and heat exchange equipment.Ultrasonic descaling technology has quickly occupied the market with the advantages of low price,obvious effects,and non-destructive testing,but there are still problems in the actual application process.For example: When the ultrasonic descaling equipment is working for a long time,The increase of working temperature of magnetostrictive transducer will lead to the decrease of its output amplitude,which will affect its descaling effect.Therefore,the temperature rise mechanism of the transducer during long-term operation is analyzed,and the frequency stability of driving signal of magnetostrictive transducer is studied,The relationship between the working frequency of the transducer and the output amplitude is explored through experiments,and according to the experimental data,the frequency stability index of the driving signal is calculated and the generation scheme of the driving signal is designed.On this basis,by studying the working pulse width duration and output amplitude of the transducer driving signal,the working mode of the driving signal is determined,and a driving signal with intermittent pulses is proposed to solve the temperature rise problem of the transducer working for a long time.The working period of the driving signal is 100 ms,and the working pulse beam width is set in the range of 0 to 25 ms during the experiment testing.The experimental data show that when the pulse beam signal duration is set to work for 5 ms and rest for95 ms,the working temperature of the transducer reaches the thermal stability state after one hour is 42 ℃.In order to avoid the influence of temperature on the output characteristics of the transducer,the heat dissipation scheme of the magnetostrictive transducer is designed to ensure that the system can work continuously for a long time and enhance its descaling effect.The system is designed according to the proposed driving signal and operating mode.The system mainly consists of two parts: hardware design and software design.The hardware design of the ultrasonic descaling system for high-power magnetostrictive transducers consists of a power supply system,a master microcontroller,a signal source system,a signal processing system,a power amplifier,and transducers.The software design part consists of the system main program design,AD9833 subroutine design,digital tube display frequency subroutine design,and frequency adjustment subroutine design.The experimental results show that using the designed driving signal and cooling scheme can effectively solve the temperature rise problem caused by the long-term operation of the magnetostrictive transducer,and the system can work continuously for a long time,enhancing the descaling effect,proving the advantages of the system design.Finally,the shortcomings in the system design process are analyzed,and corresponding suggestions are given. |
