Installation and manufacture of ventilation pipes
1, marking should be carried out according to different sizes, shapes and specifications of air ducts, and at the same time, a section of air ducts should be completely carried out to prevent cross-hole marking and wrong blanking. The shearing should be carried out according to different marking stages, and the blanking should be rechecked to avoid mistakes. Cut with mechanical scissors according to the scribing shape.
2. When cutting, it is forbidden to put your hand into the gap of the mechanical platen, and tools and other items are not allowed to be placed on the upper tool rest. Don't put your feet on the pedal when adjusting the sheet metal. Stabilize the steel plate with both hands of the fixed vibration scissors, with the hands not less than 5cm away from the blade, and the force should be even and appropriate. After blanking, the plate must be chamfered with chamfering machine or scissors before rolling. The air duct made of metal thin steel plate is connected by different ways such as biting, riveting and welding. The bite width and allowance shall be determined according to the thickness of the plate.
3, the weld must be uniform, no crack and slag inclusion phenomenon, rivet connection, rivet center perpendicular to the panel first, rivet head pressure plate, make the plate closely, neatly and evenly arranged. For riveting between plates, padding is generally not allowed in the middle. When specified in the design, follow the design. When biting, fingers should be protected with a roller of not less than 50mm, and hands should not be placed on the pipe of the bite machine to stabilize the plate.
4. After biting, put the drawn square line on the folding machine and the center line of the lower die. When operating, make the upper blade of the machine coincide with the center line of the lower die and fold it into the required angle. Cooperate with each other when folding, and keep a certain distance from the folding machine to avoid being hurt by overturned steel plates or accessories.
5. When making the air duct, make the two ends of the bite into arcs and put them on the curling iron for curling. Adjust the distance between the upper and lower rollers according to the diameter specification of the air duct, and do not push the steel plate directly by hand during operation. Folding or circular steel plates are sewn by sewing machine or hand. When operating, the force should be even, and it is not easy to be overweight. Single-mouth and double-mouth bite confirmation, no dirty crack or half bite.
Galvanized steel pipe is a traditional air duct for ventilation and air conditioning, which is made of galvanized steel plate as the main raw material. It is made by biting and processing. It has the characteristics of convenient on-site production and designability. At the same time, with the development of technology, manual production has been changed into fully mechanized production, with high efficiency and accurate processing size.
Ventilation duct installation requirements
1. General provisions for manufacturing air ducts: Before manufacturing air ducts, first check whether the materials used meet the quality requirements and whether there are factory certificates or quality appraisal documents. If there is no such certificate, the appearance inspection shall be carried out, and the following requirements shall be met: the surface of the plate shall be smooth, uniform in thickness, free from unevenness and obvious flattening, and free from cracks, sand holes, scars, burrs and corrosion. Steel should be uniform, and there should be no cracks, bubbles, holes and other defects that affect the quality. Other materials cannot reduce the strength of the finished product or affect its use efficiency because of defects.
2, duct and accessories surface level off, uniform arc, longitudinal joints should be staggered; Bite seam should be tight and uniform in width. The weld shall be visually inspected, and there shall be no defects such as blowholes, sand holes, slag inclusions and cracks. The deformation of steel plate after welding should be corrected.
3. When manufacturing metal air ducts and pipe fittings, the allowable deviation of outer diameter or outer length:-1mm; When less than or equal to 300 mm; More than 300-2mm is -2mm. Among them, the allowable deviation of the inner diameter of circular flange or rectangular flange is +2mm, and the unevenness should not be greater than 2mm.
4. All right-angle elbows in the air duct system are equipped with noise-reducing elbows, and galvanized iron plate guide vanes are arranged in the noise-reducing elbows. The insulation layer of the air duct is made of polystyrene foam board with a density of 40k g/m3 and a thickness of 35mm (the surface temperature shall not be lower than 5 degrees). The connecting part at the edge of the insulation layer should adopt step or tenon-groove structure and be bonded with resin. The outer surface shall be wrapped with aluminum foil cloth and attached with heat sensitive tape, and there shall be no condensation on the outer surface of the air duct.
5. The air duct adopts mechanical bite, neat and tight, and there is a large piece of glass glue on the inner surface of the interface. The connection between the air duct and the tuyere is connected by a hose with insulation layer. Duct installation should be straight, the straightness of main duct installation should be less than or equal to 1.5 mm/m, and the roughness should be less than or equal to1mm/m. Duct reinforcement: rectangular duct with length greater than or equal to 630mm, thermal insulation duct with length greater than or equal to 800mm and pipe section with length greater than 1.2m should be reinforced. ..
The above is the knowledge about the installation and manufacture of ventilation pipes that I shared with you today, and I also shared the relevant contents of the installation requirements of ventilation pipes with you, hoping to bring you help. The installation of pipes is very important. It is the circulation of air, which will give off bad air. Therefore, we must know more about the installation of ventilation pipes and install them correctly in order to make better use of them.