Ultrasonic waves propagate in the liquid, causing the liquid and the cleaning tank to vibrate together at the ultrasonic frequency. When the liquid and the cleaning tank vibrate, they have their own natural frequency. This vibration frequency is the sound wave frequency, so people hear the buzzing sound. With the continuous development of the cleaning industry, more and more industries and enterprises have used ultrasonic cleaning machines.
The advantages of the ultrasonic cleaning machine are: the ultrasonic cleaning effect is good, and the operation is simple. The sound that people hear is a sound wave signal with a frequency of 20-20000 Hz. The sound wave above 20000 Hz is called an ultrasonic wave. The transmission of the sound wave propagates longitudinally according to a sinusoidal curve, producing a large number of small bubbles. One reason is that partial tensile stress occurs in the liquid to form negative pressure. The decrease in pressure makes the gas originally dissolved in the liquid supersaturate and escape from the liquid and become small bubbles; the other reason is that the strong tensile stress tears the liquid apart. "A void is called cavitation.
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According to Wang Guoqiang, in 2011, the central government invested nearly 6 billion yuan, including 4.212 billion yuan in new investment, supporting 1814 county-level Chinese medicine (ethnic medicine) hospitals, 58 prefecture-level national medical hospitals, and 88 western-level prefecture-level local traditional Chinese medicine practitioners. The hospital's service capacity building; Arranging funds of 1.014 billion yuan to support the construction of 70 county-level Chinese medicine hospitals; Newly-added investment of 300 million yuan to support the construction of 88 Chinese medicine specialties in the National Key Clinical Specialist Construction Project; 412 million yuan of funds to support National old Chinese medicine heritage studios and other projects.
Wang Guoqiang said that for more than three years, the central government has invested a total of 17.3 billion yuan, of which 4.53 billion yuan has been earmarked to support the construction of 16 national TCM clinical research bases and the construction of 313 prefecture-level and above key Chinese medicine hospitals. “The Construction and Development Plan of Key Traditional Chinese Medicine Hospitals†central investment mission; arranged special funds of 5.67 billion yuan, supported the construction of 382 county-level Chinese medicine hospitals; arranged special funds of 7.143 billion yuan for organizing and implementing county-level Chinese medicine hospitals for first aid emergency and Pharmacy construction, general practitioner training in Chinese medicine, key disciplines and key specialties in Chinese medicine, promotion of appropriate diseases for the development of basic diseases and common diseases, and capacity building for traditional Chinese medicine (TCM) hospitals in cities and counties.
It is reported that at the same time, all levels of government's investment in the development of Chinese medicine has increased significantly. (Reporter Wang Hao)
For the principle of ultrasonic cleaning machine, the high-frequency oscillation signal sent by the ultrasonic generator is converted into high-frequency mechanical oscillation by the transducer and propagated to the medium-the cleaning solvent. The ultrasonic wave radiates forward in the dense and dense phases in the cleaning liquid. The flow of liquid produces tens of thousands of tiny bubbles with a diameter of 50-500μm, and the tiny bubbles existing in the liquid vibrate under the action of the sound field. These bubbles form and grow in the negative pressure zone where the ultrasonic wave propagates longitudinally. In the positive pressure zone, when the sound pressure reaches a certain value, the bubbles increase rapidly and then suddenly close. And when the bubble is closed, a shock wave is generated, and thousands of atmospheres are generated around it, destroying insoluble dirt and dispersing them in the cleaning liquid. When the group particles are wrapped in oil and adhere to the surface of the cleaning part, the oil is emulsified and solid Particles and detachment, so as to achieve the purpose of cleaning parts purification. In this process known as the "cavitation" effect, the closed bubble can form a high temperature of several hundred degrees and an instantaneous high pressure of more than 1,000 atmospheres.
China Provides "Fortune" Guarantee for the Development of Traditional Chinese Medicine
Wang Guoqiang, deputy director of the Ministry of Health and director of the State Administration of Traditional Chinese Medicine, said at the 2012 National Conference on Chinese Medicine in Beijing on the 10th that for more than three years, the central government has invested more than 17.3 billion yuan in the development of Chinese medicine.