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基于粉尘浓度测定和粉尘分布规律、运移规律和沉降规律研究的需要,在气溶胶粉尘发生器的基础上,设计了由计算机控制的全自动漏斗吸嘴式粉尘发生装置。提出了该装置的设计原理、设计结构及运行操作方法。基于C++设计了该装置的控制程序软件包,利用软件包中的驱动控制程序,实现了在计算机上对粉尘发生装置的远程遥控。监测传感器可及时发现吸嘴口是否出现粉尘堵塞,故障传感器同步监测步进电机和搅拌电机,通过微型计算机分析故障并发出相应控制指令。操作过程中,通过对圈数、时长、粉尘用量和密度的设置,可发生1种或多种粒径粉尘,控制发尘浓度、分散度,实现粉尘连续供给。通过发尘效果检验,得出在不同作业工序下,无论是连续产尘的喷浆、凿岩作业,还是瞬间产尘的爆破作业,该装置都具有较好的模拟产尘效果,产尘的分散度、浓度与现场实测值基本一致,表明该装置的粉尘粒度分布控制、产尘流量控制等技术达到了预期效果,可为研究粉尘相关特性试验提供稳定可靠、数量可控的粉尘源。
Based on the determination of dust concentration and the requirement of dust distribution, migration and settlement, a computer-controlled hopper dust generator with hopper was designed on the basis of aerosol dust generator. The design principle, design structure and operating method of the device are put forward. Based on C ++, the control program package of the device is designed. By using the drive control program in the package, the remote control of the dust generating device on the computer is realized. Monitoring sensors can be found in a timely manner nozzle mouth dust clogging occurs, the fault sensor synchronization monitoring stepper motor and stirring motor, microcomputer fault analysis and issue the appropriate control instructions. During the operation, one or more kinds of particle dusts can be generated by setting the number of turns, the duration, the amount of dust and the density, and the dust concentration and dispersion can be controlled so as to realize continuous dust supply. Through the test of dust effect, it is concluded that the device has good simulation dust-producing effect under different operation procedures, whether it is continuous dust-producing shotcrete, rock drilling or instantaneous dust production. Dispersion and concentration are in good agreement with the measured values in the field, indicating that the device has achieved the expected results in dust particle size distribution control and dust production flow control, and can provide a stable and reliable dust source with controlled dust quantity for the study of dust-related properties.