For oil fume pipelines, it can be divided into external vertical oil fume pipelines and horizontal oil fume pipelines. (1) External lampblack pipeline: For the external vertical lampblack pipeline which has not been cleaned for more than half a year, it is not necessary to clean it temporarily, because the lighter lampblack is sucked away by the fan, and the heavier lampblack will be deposited at the elbows of the vertical lampblack pipeline and the horizontal lampblack pipeline, and a very small part of lampblack will remain on the inner wall of the vertical lampblack pipeline, which will not form a thick oil stain. For the lampblack pipeline which has not been cleaned for more than half a year, it is only necessary to clean the lampblack pipeline elbow. Customers who need to clean the vertical oil fume pipeline provide you with three different cleaning methods to choose from: A. Disassembly method: This method is the most thorough and the best cleaning method, but it is difficult to construct, requires a large amount of workers and costs relatively high. The cleaning scheme of oil fume pipeline is: according to the actual cleaning situation of oil fume pipeline, technicians calculate to dismantle a section of oil fume pipeline at regular intervals and extend it in two directions to ensure thorough cleaning and clean quality. B. Opening method: This method is relatively easy and relatively low in cost compared with the disassembly method, but the cleaning effect is relatively poor. The specific method is: technicians calculate the interval distance, position, size and number of holes to be opened, and clean the oil fume pipeline through these holes. Finally, each hole is sealed. C. Mechanical equipment method: This method is the easiest to operate, the least difficult, the least workload and the lowest cost, but the cleaning effect is also the worst. However, this cleaning method is undoubtedly the best choice for cleaning vertical oil fume pipelines with a cleaning cycle of less than half a year. The specific method is: after spraying the oiling agent into the oil fume pipeline, clean the inner wall of the oil fume pipeline with an electric flexible shaft brush and a pneumatic flexible shaft brush that can extend into the oil fume pipeline for up to 31 meters.