The steel coil requiring pickling treatment is deposited on the rotary rack at the entrance of the unit by the raw material straddle crane. The rotary rack, which is rotated by the hydraulic motor, has three bearing arms, each of which can carry a steel coil with a maximum weight of 24 tons.Rotary frame, on the steel coil from the ground type steel coil car, and then across the transport to pickling uncoiler on the drum.
After the drum rises and opens the fixed steel coil, turn the uncoiler and send the strip head to the open clip straightening machine with the help of the pressure roller and uncoiler device. The straightening head is sent back and forward to the cutting head to cut off the unqualified part of the strip head, and then the mechanical alignment is conducted with the help of the 1, 2# side guide device to facilitate the belt penetration.
After the indicator light is on, the tape is put on, making the tape go through the pre-cleaning trough, the three-section pickling tank, the four-level spray "cleaning trough, and the hot air dryer to reach the disc cutter in turn.The preflush groove has three functions: firstly, before the strip enters the pickling tank, loose dust, oxidized iron sheet, oil and residue on the strip are removed through the prewash tank.The second is to preheat the strip.Third, flush the strip surface after the belt fault occurs, remove the acid liquid from the acid groove on the strip surface, so as not to corrode the equipment of the inlet section.Preflush solution can be cold water or lye, depending on different needs;Three sections of cascade countercurrent pickling tank is used to remove iron oxide on the surface of the steel strip, each storage tank acid circulation system with a set of independent, continuous heating acid acid circulation system used for keeping acid temperature within the scope of a specified process, moreover through circulating mixing effect, to fully exchange acid on the surface of the steel strip, thereby enhancing pickling effect;Acid is automatically discharged into the waste acid tank for treatment.The spray cleaning system is used to remove the residual acid liquid on the surface of the strip.
Thus saving water consumption.After the strip comes out of the cleaning trough, the strip surface is dried by the hot air dryer.In the process of belt penetration, the strip head is tracked by the belt gauge system, so that each roller in the pickling process section is connected up and down, so that the belt penetration can be completed successfully.
After the strip reaches 4 sides, it passes through the disc shearing edge and oil coating machine, and then is rolled by the reel.
The waste edge under the disc shearing is rolled by the waste edge coiler for transportation and processing. In order to coil the strip steel, a tension device is provided at the inlet side of the oiler.
When the coil end of the coiler clamps the head and coils for two to three turns, the whole unit can be accelerated to the set process speed for pickling, and the unqualified parts of the strip end are cut off at the outlet hydraulic shear.The steel coil after being taken off is closed by the outlet ground type steel coil and unloaded from the drum. After being tied, it is transported across the rail to the outlet steel coil to store the rotating frame. Finally, the pickling coil is hoisted into the storage before rolling.
In order to improve the environment of the workshop, the pickling unit is equipped with an acid mist ventilation purification system. After the acid fog is absorbed by washing, the HC1 content discharged into the atmosphere is less than 10mg/m3