Processing construction of non-standard parts for

(4) profile steel is straight: the deflection height of profile steel f ≤ l/1000 and ≤ 5mm, and the inclination of I-steel flange plate △≤ b/80; Partial deflection of steel plate δ ≤ 14, f ≤ 1.5; δ＞ At 14, f ≤ 1. If the above requirements cannot be met, stop correcting the steel

3. Assembly

(1) during the production of steel components, in order to prevent welding deformation, fully operate various clamping molds to increase the amount of plastic repair. When inserting and assembling the mold, its positioning should consider the extension of the component, and adjust the reserved amount at any time according to the actual environment, so as to improve the processing accuracy

(2) allowable assembly error: wrong joint δ 1 ＜ 2.0, butt clearance δ 2= 1.0, lap gap δ 3 ＜ 1.5, T-shaped clearance ＜ δ 4=1.5

(3) check the assembly accuracy and lag behind in tack welding

(4) the assembled components shall be numbered on the obvious parts with paint

4. Welding

(1) before welding, the welder should review the assembly quality and the cleaning environment of the welding area. If it is not suitable for the technical requirements, it should be repaired and qualified before welding

(2) when the groove welding of thick plates is stopped, the middle layer of the weld can be welded with ￠ 5 ￠ mm or ￠ 6 ￠ mm electrode depending on the environment

(3) in the process of arc welding, especially at the tack weld, the back gouging task should be done well, and the flawless weld metal can be completely cleaned out before welding

(4) observe the following criteria when welding

do not concentrate heat in one part, and try to separate evenly; Adopt the construction method of "the deformation caused by the first welding is reduced by the subsequent welding"; The construction of parallel welds shall be stopped at the same time along the same welding target as far as possible; Stop welding outward from the middle of the layout; Weld from the thick part of the plate to the thin part

(5) after welding, if cracks are found in the weld, the welder shall not deal with them privately, and shall report to the person in charge of welding to find out the notice

(6) the weld after welding must be completely broken of welding slag, spatter and overlap

(II) rust removal and anti-corrosion of steel components

in order to ensure the service life of the shaft drainage pipeline, fully demonstrate the investment benefits, and follow the design requirements of the shaft drainage pipeline device, the "arc spraying process" is selected to stop the anti-corrosion treatment of the shaft pipeline, stinger beam, stuck pipe beam, support and other metal components. This technology is advanced. This construction technology follows the general pretreatment → the smooth stop of arc spraying

1. Construction preparation

operate the 6m3 air compressor as the construction air source, and use the air pipe to replace the oil filter. One acrr/ac high-efficiency sand blasting machine, one set of compressed air filter processor, and one set of arc spraying equipment will be selected, which will be connected to form a fragment. When the power is connected, the rust removal of the workpiece can be stopped

2. General pretreatment

(1) the general pretreatment of the workpiece before spraying is a key link related to the success or failure of the spraying operation. The workpiece after pretreatment is a bright outline without oil, rust, clean and sufficient roughness. The first step of the general pretreatment is to remove the general oil, oxide skin, paint, soil and other dirt of the workpiece, and the method is sand blasting rust removal process

(2) the workpiece that has been derusted by sand blasting is basically clean and has a large outline as much as possible, which is very important for the effective contact between the coating and the workpiece. We can meet the above requirements by using the jet suction sandblasting machine to roughly roughen the workpiece. The compressed air used by the sand blasting machine is connected by the 6m3 air compressor, and the dry, oil-free air with a pressure of 0.6MPa is obtained through the compressed air filter processor. When the sand blasting is roughened, it is stopped in the semi enclosed sand blasting task shed, so that on the one hand, it is convenient for the sand material to be received and reused, on the other hand, it increases pollution. The operating staff must wear sanding clothes when doing homework, and stop strictly following the procedures, The included angle between the target of the abrasive radiation target and the workpiece should be controlled at 60 degrees. The interval from the sandblasting nozzle to the workpiece should be 100-300 mm. During sandblasting, the nozzle should be prevented from being perpendicular to the workpiece to prevent the abrasive from bouncing back to hurt people. The nozzle aperture used for sandblasting is ￠ 8 mm, and the abrasive is quartz sand with No. 30 gauge (particle size 1-2.5 mm). After sandblasting, the steel workpiece is roughly silver gray, uniformly roughened, and free of rust spots and other substances, The derusting grade meets the requirements of Swedish Sa2.5 standard

3. Arc spraying process

arc spraying zinc according to the requirements of the design and construction drawing of the shaft drainage pipeline device. After the workpiece is roughened, connect the arc spraying motor source, adjust the voltage, current and atomization gas source of the spraying machine, and stop the workpiece spraying work. Because the arc light generated during arc spraying is serious to the eyes, and the generated gas and dust are harmful to the human body, the operators must wear spraying clothes and dark glasses to stop protection. During spraying, the interval between the spray gun and the workpiece should be stable, and the walking speed should not be too fast or too slow. Evenly spray and crimp the last coating, and the sprayed workpiece should be painted with a layer of sealing paint to stop sheltering. During arc spraying corrosion prevention, the workpiece shall be stopped by classification until it is completely completed

4. After arc zinc spraying, apply one coat of epoxy asphalt primer, and start the oil pump to adjust the pointer to the zero position, and apply two coats of oxygen asphalt finish paint

5. During the processing of non-standard parts of the drainage pipeline of Suncun mine barrel and the derusting and corrosion prevention of steel components, close attention should be paid to the climate change. It is strictly forbidden to stop sandblasting and arc spraying in rainy days. If it must be stopped, the sandblasting process garden should be set up with a rainproof shed, and the arc spraying process should be placed in the internal skill class of the right and work shed. It is required that the spraying construction of workpieces qualified for derusting must be stopped within 2 hours