碾磨过程如何使人们接触到危险颗粒?
The milling process removes material from sections of existing roadways so that you can repair cracks and potholes and all that terrible stuff. 铣床允许我们只针对需要修复的层. 为了进行切割，我们使用带有硬质合金镐的旋转滚筒. That produces a lot of dust, some of which is silica dust, essentially very fine sand. 这种材料可能有危险, especially to workers who could be exposed to it for extended periods of time, 也对路过的人说.
这在过去是如何处理的?
旧技术, 它已经存在很长时间了, 用水冷却鼓上的镐, 这也有助于减少灰尘. 它使用一个加压系统和喷雾棒位于整个鼓.
这方面已经有了一些改进. 一是使用
水添加剂 它们被添加到水箱中. Those are very expensive, but it is imperative to use them to reduce the dust and cool the drum.
另一项技术是
真空切割系统, which vacuums the dust as it comes off the drum and sends it up through the conveyor onto the truck. Finally, some vendors use pressurized cabs to protect the operator from dust.
Machines with these technologies meet ISO standards and the current NIOSH testing requirements for safety. Bomag’s Ion Dust Shield (IDS) adds to that existing technology to make the air even safer.
离子防尘罩是如何工作的?
IDS位于输送机的末端. What we do, is force that dust-filled air through the sealed conveyor into a box. Inside the box are electrically charged blades that attract the really fine particles. 所以，它们进入卡车而不是飞到空中. 有趣的是，它不是过滤器，所以 它不需要维护.
IDS删除 the most dangerous particles – they are so tiny that you don’t see or feel them, 但它们会深入肺部，导致矽肺病. IDS删除 80%以上 那些有害粒子, so that’s a substantial improvement on top of the measures we already have in place with the older technology.
A big advantage is that instead of just protecting the operator who has the most exposure, the IDS protects people nearby by keeping these particles out of the air altogether. Those microscopic particles can stay in the air for a long time – if there is no wind, 它们可以在空中停留长达30个小时. So, if you’re milling around a school or in a residential area, that could be a public hazard.
IDS确实提高了安全和环境的标准.
