Steel plate pretreatment production line

In the domestic shipbuilding, container and large-scale machinery industries, the shot blasting method on the steel plate pretreatment line equipment is generally used for abrasive treatment, jet abrasive treatment and pickling treatment. Among them, to obtain high-efficiency and high-quality automatic flow operations, there is currently only a shot blasting method.

        Shot blasting is to use the centrifugal force generated by the impeller of the shot blaster to rotate at high speed to shoot the projectile material (steel shot, steel wire section, angular steel sand, etc.) at a very high speed toward the surface of the steel to be processed, resulting in shock and Grinding action to remove scale and rust on the steel surface, let the steel surface reveal the true color of the metal and show a certain roughness, in order to facilitate the adhesion of the paint.

        There are generally two types of shot blasting pretreatment lines: one is the steel plate pretreatment line, and the other is the steel section pretreatment line. The working principles of the two are the same. Currently, shipyards, containers and large port machinery plants use Method, the general steel structure factory uses the second method, the purpose of the two methods is the same to ensure the coating quality.

Process flow chart of steel plate shot blasting pretreatment line

(1) Steel plate leveling

        The steel plate will be deformed during transportation or after long-term stacking, which will affect the processing accuracy during the production of the workpiece, so the steel plate should be leveled. After leveling, the loose part of the oxide scale on the surface of the steel plate can be peeled off, which is of great benefit to the subsequent shot blasting. At the same time, the leveling machine capacity is different from 5mm to 30mm. In addition, the steel plate leveling machine is also placed behind the assembly line, which is a test for the performance of the shop primer.

(2) Steel plate transportation

        After hoisting the steel plate with electric permanent magnet jack, the conveying of each process is completed by the roller table. The roller table is usually cylindrical, with bearing seats at both ends, and the roller table spacing is 500~750mm. After the spraying work is completed, in order to prevent the paint on the side contacting the roller table from being damaged, there are special requirements for the structure of the roller table. Therefore, the general contact area between the roller table and the steel plate will not cause large-scale workshop primer damage and will be affected very little. In order to ensure that the steel plate is not deformed during shot blasting, the distance between the rollers in the shot blasting machine should not be less than 500mm.