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小型扬尘模拟设备的研制

发布时间:2018-11-22 19:11
【摘要】:大气颗粒物不仅是造成城市颗粒物污染的重要因素,同时也是造成电子仪器设备内部电接触故障的重要因素。虽然市场上存在具有模拟沙尘实验和检测外壳防护的尘土实验箱,但是关于研究设备内部电子元件受尘土影响的小型扬尘模拟实验装置却不是很多。为了满足电子设备内部元器件尘土实验的颗粒度和积尘重量要求,制造一个定量可控的扬尘设备是一个亟待解决的问题。 通过对国内外现有的扬尘模拟设备的各项指标进行比较,并依据后续尘土实验的基本要求,本课题研制了一种小型扬尘模拟设备,从功能角度分为尘土颗粒筛选模块和扬撒积尘模块。实现颗粒度筛选、和尘土颗粒的均匀扬撒及重量控制。从设计角度将设备按照机械模块、控制反馈模块、实验验证三个方面进行了进行详细阐述。 本课题中机械模块主要是完成尘土颗粒筛选部分和扬撒部分的理论计算、工艺设计、材料选型及校核等工作。采用扭转弹簧连接装置带动偏心块做圆周运动,在偏心块做圆周运动及基座上四个螺旋弹簧轴向拉伸和压缩的作用下,双层筛网结构在竖直方向上做往复振动,实现尘土颗粒尺寸筛选,并进行积尘室结构设计。控制反馈模块采用高精度的AD转换芯片进行积尘重量的模拟量转换,传递给单片机进行处理,通过控制功率合适的吹风模块以及输入输出电路模块,有效提高了样品积尘的分布均匀性及积尘量的准确性,并且实现尘土扬撒的自动控制。通过模拟实验,验证了尘土颗粒尺寸筛选和均匀扬撒积尘的效果。
[Abstract]:Atmospheric particulate matter is not only an important factor of urban particulate pollution, but also an important factor of electrical contact failure of electronic equipment. Although there are dust test boxes with simulated sand dust test and shell protection in the market, there are not many small dust simulation devices for the study of the influence of dust on the electronic components inside the equipment. In order to meet the requirements of particle size and dust accumulation weight in the dust experiment of electronic devices, it is an urgent problem to manufacture a quantitatively controllable dust hoisting equipment. Based on the comparison of various indexes of the existing dust simulation equipment at home and abroad, and according to the basic requirements of the follow-up dust experiment, a small scale dust simulation equipment is developed in this paper. It is divided into dust particle screening module and dust accumulation module from the angle of function. To achieve particle size screening, and dust particles evenly spread and weight control. According to the mechanical module, the control feedback module and the experimental verification, the equipment is described in detail from the design point of view. In this paper, the mechanical module is mainly used to complete the theoretical calculation, process design, material selection and verification of dust particle screening part and hoisting part. The torsional spring connection device is used to drive the eccentric block to make circular motion. Under the action of the eccentric block and the axial tension and compression of the four helical springs on the base, the double sieve mesh structure makes reciprocating vibration in the vertical direction. Dust particle size screening and dust chamber structure design. The control feedback module uses the high-precision AD converter chip to convert the dust accumulation weight to the single-chip computer to process, through the control power appropriate blowing module and the input and output circuit module, The distribution uniformity of dust accumulation and the accuracy of dust accumulation amount are improved effectively, and the automatic control of dust dispersion is realized. The effect of dust particle size screening and uniform dust deposition was verified by simulation experiments.
【学位授予单位】:北京邮电大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:X513;TN607

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