共查询到20条相似文献,搜索用时 62 毫秒
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超声波清洗技术及应用 总被引:1,自引:0,他引:1
超声波是频率在人耳听觉范围上限(16kHz~20kHz)以上的声波,超声波因其频率高、方向性强、穿透本领大,尤其是在液体中能产生空化现象等特点,已被广泛应用到许多领域。超声波应用技术甚多,主要分为检测超声、医学超声、声表面波、功率超声及高频超声等,超声波清洗技术(以下简称“超声清洗”)是功率超声应用最广泛的一种。超声清洗有时被称“无刷清洗”,把工件放入超声清洗机中,无需任何刷、搓、滚动等清洗动作,污物“自动”从工件表面脱落,一会儿就干净如新,看起来非常神奇,那么,它究竟是怎样清洗的呢? 相似文献
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超声波清洗设备的发展方向目前有二个:一个是从单缸机到多缸机或自动化的超声清洗生产线;另一个是,从低频超声清洗机到高频超声清洗机。 相似文献
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光学零件超声波清洗的应用现状及其发展 总被引:2,自引:0,他引:2
本文在概述超声波清洗机理之后,着重介绍了光学零件超声波清洗的应用现状及光学零件超声波清洗用的清洗剂、脱水剂、干化剂等清洗辅料的几个进展阶段,以及当前清洗辅料的研究动态及面临课题。 相似文献
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上海超声波仪器厂新近推出的CQX40-06型超声波清洗器是一种新颖的具有高效率低噪声的清洗设备,它装有数字显示定时装置,使用简单,清洗质量好。由于该清洗器具有以上独特的性能,所以被广泛地应用于电子、机械、钟表、光学、医疗等行业。 相似文献
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Woo-il BaekR. Nirmala Nasser A.M. BarakatMohamed H. El-Newehy Salem S. Al-DeyabHak Yong Kim 《Applied Surface Science》2011,258(4):1385-1389
In this study, we describe the first reported preparation of rosin in fiber form through use of an electrospinning technique utilizing various solvent systems. The polymer concentration of the formed fiber was studied by using various solvents such as chloroform, ethanol, N-N dimethylformamide (DMF), tetrahydrofuran (THF), acetone, and methylene chloride (MC). An electrospray of the solution resulted in the beaded form of the rosin. By varying the polymer concentration with MC, we were then able to obtain uniform fibers. However, the fibers exhibited large diameter. We believe that it is possible to reduce the diameter of the rosin fibers through appropriate selection of electrospinning parameters. In addition, the morphological transitions from beads, to beaded fiber, to fiber were studied at different polymer concentrations. We propose a possible physical cross linking mechanism for the formation of rosin fibers during the electrospinning process. Our results demonstrate the feasibility of producing fiber nanostructures of rosin by using an electrospinning technique. 相似文献
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This paper describes the ultrasonic degradation of oxalic acid. The effects of ultrasonic power, H2O2, NaCl, external gases on the degradation of oxalic acid were investigated. Reactor flask containing oxalic acid was immersed in the ultrasonic bath with water as the coupling fluid. Representative samples withdrawn were analysed by volumetric titration. Degradation degree of oxalic acid increased with increasing ultrasonic power. It was observed that H2O2 has negative contribution on the degradation of oxalic acid and there was an optimum concentration of NaCl for enhancing the degradation degree of oxalic acid. Although bubbling nitrogen gave higher degradation than that for bubbling air, both gases (for 20 min before sonication and during sonication together) could not help to enhance the degradation of oxalic acid when compared with the degradation without gas passage. 相似文献
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Expressions for the attenuation coefficients of longitudinal and transverse ultrasonic waves are developed for steel with pearlitic microstructure. This type of lamellar duplex microstructure influences attenuation because of the lamellar spacing. In addition, longitudinal attenuation measurements were conducted using an unfocused transducer with 10 MHz central frequency on the cross section of a quenched railroad wheel sample. The dependence of longitudinal attenuation on the pearlite microstructure is observed from the changes of longitudinal attenuation from the quenched tread surface to deeper locations. The results show that the attenuation value is lowest and relatively constant within the quench depth, then increases linearly. The experimental results demonstrate a reasonable agreement with results from the theoretical model. Ultrasonic attenuation provides an important non-destructive method to evaluate duplex microstructure within grains which can be implemented for quality control in conjunction with other manufacturing processes. 相似文献
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高波阻抗层下多层低波阻抗层间脱粘的超声检测问题是具有普遍意义又很难解决的检测问题,本文介绍了我们近年来在些方面的一些研究进展,首先从传播特性入手总结出几个有用的特征规律,并结合这些物理特征规律选取相应的信号处理手段,从方法上实现多层界面的脱粘检测,并作了多种技术集成,做出有实际应用价值的检测系统。 相似文献
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Ultrasonic velocity dispersion in methylcyclohexane was studied in the frequency range of 0.5 to 5.0 MHz at 60°, 65°, 70°,
75° and 80°C using a variable path interferometer. Necessary corrections for the diffraction of the ultrasonic beam were applied.
The velocity data were used to evaluate the relaxation parameters pertaining to the interconversion of the axial and equatorial
isomers. The value of the difference in enthalpy, difference in entropy and the activation energy are 11.2±4.0 kJ mole−1, 28.0±8.0 J mole−1K−1 and 43.7±4.0 kJ mole−1 respectively. These values are in good agreement with values derived by Piercy and Subrahmanyam from their ultrasonic absorption
measurements. 相似文献
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Lanin VL 《Ultrasonics sonochemistry》2001,8(4):379-385
Ultrasonic (US) soldering of electronic components, as an alternative to flux soldering, is environmentally friendly, improves the quality of soldered connections at the mounting elements after long-term storage, and allows the use of lead-free solders. Methods of US solder melt activation, lead-free solders in US soldering and glass-ceramic capacitor metallization processes have been investigated. 相似文献
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We present the results of experimental investigation of ultrasonic washing of textiles. The results demonstrate that cavitation bubbles oscillating in acoustic fields are capable of removing soils from textiles. Since the washing performance is mitigated in a large washing bath when using an ultrasonic transducer, we propose a novel washing scheme by combining the ultrasonic vibration with a conventional washing method utilizing kinetic energy of textiles. It is shown that the hybrid washing scheme achieves a markedly enhanced performance up to 15% in comparison with the conventional washing machine. This work can contribute to developing a novel laundry machine with reduced washing time and waste water. 相似文献
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An analytical solution for a three dimensional integral representation of the backscattering (BS) coefficient in polycrystals with elongated (generally ellipsoidal) grains is obtained; it is a natural generalization of the known explicit result for the BS coefficient in polycrystals with spherical grains. New insights into the dependence of the BS signal on frequency and averaged ellipsoidal grain radii are obtained. In particular it has been shown that the dominant factor for the backscattering is the averaged interaction length of the ellipsoidal grain in the direction of wave propagation, instead of the ellipsoidal cross-section. The theory was applied to a simplified model of Ti alloy duplex microstructure and was compared with experiment. For the experimental data analysis directional backscattering ratios are introduced and shown to be advantageous for characterization of duplex elongated microstructures/microtextures. In addition to the geometrical parameters of the elongated microtextures, the BS directional ratios depend on the newly introduced nondimensional material parameter q. The parameter q exhibits the relative contribution of the second phase (crystallites) to the backscattering signal, the effect of which is measurable and important. Comparison of the model with experiment shows there is a significant advantage in using the directional ratios of backscattering coefficients for data analysis. 相似文献
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This paper presents a system that accurately measures the distance travelled by ultrasound waves through the air. The simple design of the system and its obtained accuracy provide a tool for non-contact distance measurements required in the laser’s optical system that investigates the surface of the eyeball. 相似文献