• 大区经理:张经理:18663767795
  • 大区经理:陶经理:13011716033
  • 技术咨询:詹经理:18663767799
  • 传真:0531-68850070
  • 地址:山东省济南市历城区工业北路58号恒大城K栋3-3109室
新闻资讯当前位置:首页-新闻资讯
    全自动的超声波清洗机频率对清洗效果的影响
    2019-4-24 17:41:15
    1、超声波频率:物理上把频率大于20KHz的机械波称为超声波;超声波频率越低在液体中产生空腔就越容易,产生的力度大,作用也越强,适用于工件(粗、脏)初洗;超声波频率高则超声波方向性强,适合于精细工件的精密清洗。
    1. Ultrasound Frequency: Physically, mechanical waves with frequencies greater than 20KHz are called ultrasound; the lower the frequency of ultrasound, the easier it is to produce cavities in liquid, the greater the force produced and the stronger the effect produced, which is suitable for the initial cleaning of workpieces (coarse and dirty); and the higher the frequency of ultrasound, the stronger the directivity of ultrasound, which is suitable for the precise cleaning of fine workpieces.
    2、声功率密度(ρ):ρ=发射功率(W)/发射面积(CM2);通常ρ≥0.3W/CM2,就可以达到清洗要求,我们常用的超声波功率密度都大于0.5W/CM2,对普通的工业清洗已完全可以满足。功率密度越高,空腔效果越强,速度越快,清洗效果越好。但对于精密的、表面光洁度甚高的产品,采用长时间的高功率密度清洗会对产品表面产生“空化”腐蚀。
    2. Acoustic power density (p): P = emission power (W)/emission area (CM2); usually P (> 0.3W/CM2) can meet the cleaning requirements. The commonly used ultrasonic power density is more than 0.5W/CM2, which can completely meet the requirements of ordinary industrial cleaning. The higher the power density, the stronger the cavity effect, the faster the speed, the better the cleaning effect. But for precise products with high surface finish, long time high power density cleaning will cause cavitation corrosion on the surface of products.
    3、清洗介质:超声波清洗一般有化学清洗剂和水基清洗剂两类清洗剂;清洗介质的化学作用可以加速超声波的清洗效果,超声波清洗是物理作用,两种作用相结合,以对产品进行充分、彻底的清洗。
    3. Cleaning media: Ultrasound cleaning generally has two kinds of cleaning agents: chemical cleaning agent and water-based cleaning agent. The chemical effect of cleaning media can accelerate the cleaning effect of ultrasound. Ultrasound cleaning is a physical effect. The two functions are combined to fully and thoroughly clean the products.
    4、清洗温度:一般来说,超声波在30—40℃时的空腔效果最好;若使用清洗剂则温度越高作用越显著。通常实际应用超声波清洗时,采用40--60℃的工作温度为佳。
    4. Cleaning temperature: Generally speaking, the cavity effect of ultrasonic wave is the best at 30-40 C. The higher the cleaning agent is, the more significant the effect is. Usually when ultrasonic cleaning is used in practice, the working temperature of 40 - 60 C is the best.
    5、清洗时产品的放置方式及清洗液量的选择:一般清洗液的液面应高于震动面50mm以上,对于较大的工件,一般用不锈钢的网笼清洗,网笼的网眼对清洗效果有一定的影响,目前工业清洗要求网眼应大于10mm。
    5. Choice of product placement and cleaning fluid volume during cleaning: The liquid level of general cleaning fluid should be higher than 50 mm of vibration surface. For larger workpieces, stainless steel mesh cage is generally used for cleaning. The mesh of mesh cage has certain influence on cleaning effect. At present, industrial cleaning requires mesh should be greater than 10 mm.
    当全自动的超声波清洗机工作频率很低(在人的听觉范围内)就会产生噪音。当频率低于20khz时,工作噪音不仅变得很大,而且可能超出职业安全与保健法或其他条例所规定的安全噪音的限度。在需要高功率去除污垢而不用考虑工件编码损伤的应用中,通常选择从20khz到30khz范围内的较低清洗频率。该频率范围内的清洗频率常常被用于清洗大型、重型零件或高密度材料的工件。

    When the working frequency of the automatic ultrasonic cleaner is very low (within the range of human hearing), it will produce noise. When the frequency is less than 20 khz, the working noise not only becomes very high, but also may exceed the limit of the safety noise stipulated by the Occupational Safety and Health Act or other regulations. In applications requiring high power removal of dirt without considering the coding damage of the workpiece, the lower cleaning frequency is usually chosen from 20 kHz to 30 khz. The cleaning frequency in this frequency range is often used to clean large, heavy parts or high density materials.

                               全自动超声波清洗机

    20khz的磁力换能器和25khz的压电换能器
    20 kHz magnetic transducer and 25 kHz piezoelectric transducer高频通常被用于清洗较小、较精密的零件,或清除微小颗粒。高频还被用于被工件表面不允许损伤的应用。使用高频可从几个方面改善清洗性能。随着频率的增加,空化泡的数量呈线行增加,从而产生更多密集的冲击波使其能进入更小的西凤中。如果功率保持不变,空化泡变小,其释放的能量相应减少,这样有效地减少了对工件编码的损伤。高频的另一个优势在于减少了粘滞边界层(泊努里效应),使得超声波能够“发现”极细小的微粒。这种情况近似于小溪中水位降低时可以看清溪底的小石子。
    High frequencies are often used to clean smaller, more sophisticated parts or to remove tiny particles. High frequency is also used in applications where damage is not allowed on the surface of the workpiece. The use of high frequency can improve the cleaning performance from several aspects. With the increase of frequency, the number of cavitation bubbles increases linearly, resulting in more dense shock waves that can enter smaller Xifeng. If the power remains unchanged, the cavitation bubble decreases, and the energy released by the cavitation bubble decreases accordingly, which effectively reduces the damage to the work piece coding. Another advantage of high frequencies is that they reduce the viscous boundary layer (the Ponuri effect), allowing ultrasound to "detect" very small particles. This situation is similar to the small stones at the bottom of the stream when the water level in the stream decreases.
    超声波清洗机中的匹配电路是将发生器输出的电能送往换能器的通道。匹配电路虽然结构简单(通常只有一个匹配电感),却具有重要作用。相同型号的清洗机,匹配调得好的清洗效果好;匹配调的差的清洗效果差。对同一台机器而言,如果工作一段时间后清洗效果变差,或者换能器经过更换,都需要重新调整匹配。与一般电子设备的匹配有所不同,超声波清洗机的匹配除了要解决变阻问题(即变换负载的阻值,使之与发生器的最佳负载值相等)外,还要解决调谐问题,即用匹配电感的感抗抵消换能器的容抗,使换能器呈纯阻性。技术人员通常是根据各自的经验进行匹配。例如,有人在改变清洗槽水位时观察电流的变化,如果电流变化处于一定范围之内,同时管子不发热,空化声强,便认为匹配已调好。也有人让机器空载时稍微呈电感性,而在加载后转变为纯阻状态。这些经验都是适用的。但在已有经验的基础上,再掌握匹配的原理,就可以在匹配时有的放矢,更加主动,从而收到事半功倍的效果。
    The matching circuit in the ultrasonic cleaner is the channel through which the electric energy from the generator is sent to the transducer. Although the matching circuit has a simple structure (usually only one matching inductance), it plays an important role. The cleaning effect of the same type of cleaning machine is good when matched well, but poor when matched. For the same machine, if the cleaning effect becomes worse after working for a period of time, or the transducer is replaced, the matching needs to be readjusted. Different from the matching of general electronic equipment, the matching of ultrasonic cleaner not only solves the problem of variable resistance (i.e. changing the resistance value of load to make it equal to the optimal load value of generator), but also solves the problem of tuning, that is, using the impedance of matched inductance to offset the impedance of transducer, so that the transducer is pure resistance. Technicians usually match according to their own experience. For example, someone observes the change of electric current when changing the water level of the cleaning tank. If the change of electric current is within a certain range, and the tube does not heat, the sound intensity of cavitation is not strong, the matching is considered to have been adjusted. Others make the machine slightly inductant when it is idle and turn it into a pure resistance state after loading. These experiences are applicable. However, on the basis of existing experience, and grasp the principle of matching, we can target and be more active in matching, so as to get twice the result with half the effort.