After the completion of sandblasting, the rust removal parts should be checked first, and the cleanliness and roughness of the substrate steel surface should be checked. The emphasis should be on the parts that are not easy to spray, and the rust removal parts of manual or power tools can be appropriately reduced. When inspecting the cleanliness and roughness of the substrate steel surface, it is strictly prohibited to touch it by hand; Second, it should be carried out under good scattered daylight or artificial lighting conditions with equivalent illumination to avoid missing detection. After sand blasting and rust removal, the surface cleanliness of the metal structure should reach Sa21/2, which should be compared with the photos provided in the "Rust grade and rust removal grade of Steel surface before painting", and there is a comparison point at least every 2m2 when comparing. When there is no ventilation dust removal equipment or ventilation dust removal equipment fails, it is strictly prohibited to sandblast, the machine must be kept closed, and it can continue to operate after configuration or maintenance. It is necessary to close the door of the sandblasting room and the observation window before sandblasting can be carried out. To start the sand blasting machine, the compressed air switch should be opened first, and then the sand controller; When the machine is stopped, the sand controller should be stopped first, and then the compressed air should be stopped. The viewing glass must remain transparent; The nozzle of sandblasting should be kept unblocked, and if there is blockage, it should be shut down immediately for repair. In order to cause unnecessary consequences, the sandblasting machine should not be knocked. If you find such a problem is not clear, do not repair it yourself, should contact the relevant personnel to notify the equipment manufacturer, let the technical personnel help to answer, to ensure that the maintenance time is short; This can also reduce the loss in the production process. The general sandblasting machine has a variety of specifications of the sandblasting gun, as long as it is not a particularly small box, you can put the gun in to play clean. Pressure vessel supporting products letter head using sandblasting method ** workpiece surface oxide, quartz sand diameter of 1.5mm~3.5mm. Shot blasting and sandblasting can play the purpose of cleaning and decontamination of the workpiece, the purpose is to prepare for the next process, that is, to ensure the roughness requirements of the next process, but also the consistency of the surface luster. Shot blasting has the effect of strengthening and eliminating fatigue on the workpiece, and the sandblasting is not obvious.