What is the workflow of steel plate pretreatment line
(a) Steel plate leveling Steel plate will be deformed during transportation or after a long period of stacking, which will affect the processing accuracy in the workpiece production, so the steel plate should be leveled. After leveling can be the surface of the steel plate oxidation loose part off, after the shot blasting has a great benefit, while the leveling machine capacity varies generally 5mm-30mm is appropriate. There are also steel plate leveling machine placed behind the assembly line, which is a test of the performance of the shop primer.
(B) steel plate transport steel plate after loading, each process of transmission by the roller conveyor to complete. The roller conveyor is usually cylindrical, with bearing blocks at both ends, and the roller conveyor spacing is 500~750mm. After the spraying work is completed, there are special requirements on the structure form of the roller conveyor in order to prevent the paint on the contact side with the roller conveyor from being damaged, so the contact part of the roller conveyor and the steel plate generally does not produce a large area of shop primer damage and is affected very little. In order to ensure that the steel plate in the shot blasting treatment is not deformed, the roller conveyor spacing within the shot blasting machine should not be less than 500mm.
(C) preheating preheating is to blast before the steel plate to warm up, remove surface moisture, part of the oil, so that the steel plate to warm up to dry after painting. General preheating equipment electric heating wire heating, medium frequency induction heating, liquefied petroleum heating and water heating. No matter what kind of heating, the steel plate temperature should be maintained at about 40 ℃, the temperature is too low, is not conducive to removing water, oil, after the drying of the spray primer, the temperature is too high, more energy consumption, resulting in the paint drying process blistering disadvantages.
(D) shot blasting machine shot blasting machine by the impeller, shroud, directional set, sub-granular wheel, bearing housing and motor composition, impeller by the motor with action high-speed rotation (2200 ~ 2600 rpm) to generate a strong centrifugal force, abrasive by the inlet tube inhalation sub-granular wheel, under the action of centrifugal force to the blade length direction to accelerate the movement of 60 ~ 80 m / s speed thrown out, thrown out the abrasive into a fan-shaped flow will Steel plate surface oxidation and rust removed. 1, general throwing head 4 ~ 16 ranging, throwing head from the steel plate spacing of about 300 ~ 400mm, and to adjust the workpiece and throwing head angle, direction, control the amount of each throwing head. 2, 6mm below the steel plate flat steel, steel is not suitable for steel pretreatment, because too thin will be deformed. 3, control the speed of blasting. 4, choose the right shot steel shot and angular sand.