Construction method of galvanized air pipe

(1) Cutting and reinforcement

The thickness of galvanized steel plate is selected in the processing workshop according to the material list of the air pipe made, and the galvanized steel plate is loaded into the leveling machine from the loading rack, and the end of the steel plate is cut off by starting the machine. When loading, check whether the steel plate is inclined, try to cut a steel plate, measure whether the cut line of the steel plate is perpendicular to the side line, and whether the diagonal line is consistent.

Input the cutting length and quantity of the material list into the computer, start the machine, and the computer automatically cuts and presses the reinforcement. Sheet cutting must be reviewed to avoid mistakes.

Special shape plate with ACL3100 plasma cutting machine, sporadic materials use on-site electric scissors to cut, the use of fixed vibration shear hands to hold the steel plate, the hand from the knife edge shall not be less than 5cm, the force is uniform and appropriate.

(2) chamfer and bite

After the plate is cut, chamfer is carried out by punching machine.

(3) Flange processing

Angle flange connection mode: Method orchid is welded by four Angle steel. When marking off materials, pay attention to make the inner diameter of the welded flange not less than the outer diameter of the air duct, and cut off by the grinding wheel cutting machine; After straightening the material, it is placed on the punching machine to impact the rivet hole, bolt hole and hole distance. The high pressure system should not be greater than 100 mm. Medium and low pressure systems should not be larger than 150 mm after punching the Angle steel on the welding platform for welding, welding according to the specifications of the mold clamping and flattening. The weld of the air pipe flange should be well integrated and full, without false welding and holes, the allowable deviation of the flatness of the flange is 2mm, the screw hole arrangement of the same specification flange processed in the same batch should be consistent, and have interchangeability.

(4) Fold square

The sheet material after the bite is placed on the folding machine according to the drawn folding square line and placed on the center line of the lower die. During operation, the center line of the mechanical upper blade overlaps with the center of the lower die and folds into the required Angle. When folding, each other should be matched and keep a certain distance from the folding machine to avoid being hurt by the overturned steel plate or counterweight.

(5) Air duct suture

The air pipe completed by biting is stitched by a hand-held electric sewing machine. The appearance quality of the air pipe after stitching should be flat and straight, uniform arc, parallel to the two ends, no warp Angle, and the surface concave and convex is not more than 5mm.

(6) Upper flange

Technical quality check should be carried out before riveting the air duct and flange. After passing the test, the flange should be put on the air duct, and the folding line of the air duct should be perpendicular to the plane of the flange. Then, the air duct should be riveted with 5X10 rivet (rivet should be selected according to different air ducts according to the regulations, see the following table for details) with hydraulic rivet pliers or manual eye clamp pliers, and flange around; Flanging should be flat, not less than 6mm, the four corners should be leveled, there should be no gaps, so as to avoid air leakage.