The welding fume has significant effects on the weld workers＇ health. In order to overwhelm the shortcomings of the control measures of the welding fume, the research of the purifying of welding fume on the spot was ...The welding fume has significant effects on the weld workers＇ health. In order to overwhelm the shortcomings of the control measures of the welding fume, the research of the purifying of welding fume on the spot was carried out. The purifying device was designed. The relationship between the corona discharge voltage and the purifying efficiency was investigated through experiments with different needle electrode numbers, different ring electrode numbers and different needle-plate distances. The results show that 5-needle double-ring electrode has the best efficiency; the purifying efficiency is increase with the lessening of the needle-plate distance and the increase of the discharge voltage. Using 5-needle double-ring electrode, the purifying efficiency reaches its maximum value 97.9% while the needle-plate distance is 6 cm, the discharge voltage is -35 kV. The purifying device has an excellent purifying effect on the welding fume.展开更多
A large number of particulate size distributions of welding aerosols are measured by means of DMPS method, several distribution types are presented. Among them the single peak distribution is the basic composing unit...A large number of particulate size distributions of welding aerosols are measured by means of DMPS method, several distribution types are presented. Among them the single peak distribution is the basic composing unit of particulate size. The research on the mathematic models and distributions functions shows that the single peak distribution features the log normal distribution. The diagram estimating method (DEM) is a concise approach to dealing with distribution types, obtaining distribution functions for the particulate sizes of welding aerosols. It proves that the distribution function of particulate size possesses the extending property, being from quantity distribution to volume, as well as high order moment distributions, with K S method verifying the application of single peak distribution and of DEM.展开更多
针对目前移动式焊接烟尘净化器体积重量大、使用不便以及人机交互性差的问题,设计了一种基于PLC的移动式焊接烟尘净化器控制系统。此控制系统采用西门子S7-200 CPU224型PLC为核心控制器,通过与PM2.5传感器、无刷直流风机和4G网关协同配...针对目前移动式焊接烟尘净化器体积重量大、使用不便以及人机交互性差的问题,设计了一种基于PLC的移动式焊接烟尘净化器控制系统。此控制系统采用西门子S7-200 CPU224型PLC为核心控制器,通过与PM2.5传感器、无刷直流风机和4G网关协同配合,实现了对移动式焊接烟尘净化器的运行控制、操作以及远程监控等功能。对此系统的硬件选型、设计以及软件开发、组态建立进行了详细说明。通过实验对样机进行了性能测试,测试结果表明样机最大处理风量为591.98 m 3/h,净化效率达99.75%,具有较好的净化效果。展开更多
文摘The welding fume has significant effects on the weld workers＇ health. In order to overwhelm the shortcomings of the control measures of the welding fume, the research of the purifying of welding fume on the spot was carried out. The purifying device was designed. The relationship between the corona discharge voltage and the purifying efficiency was investigated through experiments with different needle electrode numbers, different ring electrode numbers and different needle-plate distances. The results show that 5-needle double-ring electrode has the best efficiency; the purifying efficiency is increase with the lessening of the needle-plate distance and the increase of the discharge voltage. Using 5-needle double-ring electrode, the purifying efficiency reaches its maximum value 97.9% while the needle-plate distance is 6 cm, the discharge voltage is -35 kV. The purifying device has an excellent purifying effect on the welding fume.
基金theStateNatureScienceFoundation PRC (No :5 860 170 )
文摘A large number of particulate size distributions of welding aerosols are measured by means of DMPS method, several distribution types are presented. Among them the single peak distribution is the basic composing unit of particulate size. The research on the mathematic models and distributions functions shows that the single peak distribution features the log normal distribution. The diagram estimating method (DEM) is a concise approach to dealing with distribution types, obtaining distribution functions for the particulate sizes of welding aerosols. It proves that the distribution function of particulate size possesses the extending property, being from quantity distribution to volume, as well as high order moment distributions, with K S method verifying the application of single peak distribution and of DEM.
文摘针对目前移动式焊接烟尘净化器体积重量大、使用不便以及人机交互性差的问题,设计了一种基于PLC的移动式焊接烟尘净化器控制系统。此控制系统采用西门子S7-200 CPU224型PLC为核心控制器,通过与PM2.5传感器、无刷直流风机和4G网关协同配合,实现了对移动式焊接烟尘净化器的运行控制、操作以及远程监控等功能。对此系统的硬件选型、设计以及软件开发、组态建立进行了详细说明。通过实验对样机进行了性能测试,测试结果表明样机最大处理风量为591.98 m 3/h,净化效率达99.75%,具有较好的净化效果。
