(1) Disassembly of horizontal three-piston pump When disassembling the three-plunger reciprocating pump, the chemical pump operator should be informed to shut off the chemical medium and carry out the necessary process to implement the safety measures After the following steps can be carried out. ①Remove the coupling cover, disconnect the pump and gearbox, gearbox and motor coupling. ② remove the gear pump, all the oil pipeline and pump import and export pipeline. ③ remove the shell. ④ remove the crosshead flange, the crosshead separated from the plunger, remove the spherical pad. ⑤ remove the crosshead platen, out of the crosshead pin, to be carefully dismantled, should not touch the mechanical damage. ⑥ disc crankshaft, the connecting rod and the crosshead separated, remove the crosshead; the connecting rod big plate to the top, measure the length of the connecting rod bolt, and record; loosen the connecting rod nut, remove the connecting rod bolt, and then measure The length of the connecting rod bolt, record the measurement results twice, compare the absolute value of the bolt length after the nut is tightened, so that the bolt tightening degree is moderate; take out the connecting rod and remove the connecting rod bulkhead bush and the small head bushings; A crankshaft, remove the ends of the crankshaft bearings. ⑦ Loosen the adjusting nut, pull out the plunger; Remove the packing, packing sleeve, guide sleeve. ⑧ remove the cylinder head bolts, remove the cylinder head; remove the washer, cylinder liner, the washer, the outlet check valve; remove the liner, under the gasket, import check valve. In the demolition process, the demolition of the parts do not knock do not touch do not fall, well marked, placed in an orderly manner. After the demolition is completed, it should be promptly cleaned and carefully inspected according to the parts quality standards in order to decide to repair or replace the new spare parts. (2) horizontal three-piston pump parts quality standards and maintenance ①crankshaft chemical pump crankshaft, blowing clean the hole, with a magnifying glass to check for cracks, if necessary, non-destructive testing to check the lathe on both ends of the main journal Radial runout, the allowable deviation of 0.03 mm, the two coaxial errors should be less than 0.03mm spindle neck, straightness deviation of less than 0.03mm, with a horizontal ruler to measure the crankshaft centerline and spindle centerline parallelism deviation tolerance of 0.15 ~ 0.20 mm / m. Cylindrical spindle spindle, circularity deviation does not allow more than half of the main journal tolerance, if more than this value, the installation of rolling bearings, the need to spray after grinding; in the installation of sliding bearings, grinding can be directly. Cylindrical crankshaft crank roundness, roundness deviation does not allow more than half the crankpin tolerance, if more than this value, grinding should be carried out. There are not deep scratches on the shaft, can be used to eliminate oilstone grinding; scratch depth of 0.10 mm or more, oilstone grinding can not eliminate, it should be grinding. When the journal diameter reduction reaches 3% of the original diameter, a new crankshaft should be replaced. ② connecting rod without cracks and other defects, if necessary, can be non-destructive testing. Connecting rod and head small head two holes centerline parallelism deviation should be within 0.30 mm / m. Check the connecting rod bolt hole, if the hole is damaged, apply reamer reaming repair. Reaming, should be equipped with new connecting rod bolts. ③ Clean water centrifugal pump connecting rod bolt rod bolt should be non-destructive testing inspection, does not allow cracks and other defects; according to the history of clear water centrifugal pump inspection records, check the connecting rod clean water centrifugal pump bolt length, length elongation exceeds the specified value Can not continue to use. ④ cross-head assembly Cross-body with a magnifying glass inspection, does not allow cracks and other defects; cross-pin non-destructive testing for inspection, does not allow cracks and other defects, and measure its cylindrical and roundness deviation; cross-pin and connecting rod larvae L contact surface with color inspection, should be good contact. If the connecting rod hole is oval, can be repaired with a reamer, and then with a new pin, sleeve; check the spherical surface of the spherical pad, not allowed to have defects such as dent; Check Crosshead and skateboard contact wear and tear, check the skateboard bolts. ⑤ The plunger piston end of the spherical surface does not allow dents and other defects, the plunger surface hardness requirements of 45 ~ 55 HRC, plunger surface roughness is not higher than Ra 0.8μm. Chemical pump plunger should not be bent, the surface should not have pits, cracks, if there are nap, dents and other defects, can be grinding. Plunger cylinder deviation does not exceed 0.15 ~ 0.20mm, roundness deviation does not exceed 0.08 ~ 0.10 mm. ⑥ seal overhaul, the filler made of filler rings made in advance for all replacement. Stuffing box with sealing liquid system, sealing liquid pipeline must be smooth. Guide sleeve hole Babbitt If there are serious defects such as nap, wear, you need to replace the new guide sleeve. Adjustment nut testing should be carried out inspection, does not allow cracks and other defects. ⑦ cylinder body color inspection inspection, if cracks are found, in principle, to replace the new spare parts, but such as carbamide carbamide pump unit, due to expensive cylinder material, should not be easily scrapped, in order to prevent the crack extension, available Grinding wheel, continue to use. Where such treatment, each disassembly after the need for detailed examination to observe whether the defect regeneration or development. Overhaul the hydraulic pressure on the cylinder test, the test pressure of 1.25 times the operating pressure. Cylinder roundness, cylindricity deviation should not exceed 0.50mm, otherwise, for knife, knife after a new cylinder liner. ⑧ Centrifugal pump inlet and outlet check valve port, seat, depending on the severity of the damage grinding or knife. Spring, screw cracks and other defects such as defects, you must replace the new centrifugal pump spare parts. The upper and lower valve sleeve of the outer circle and the end face, does not allow the hair, dents and other defects. Washers, if broken, indentation or deformation and other defects, then replace the new spare parts. ⑨ Bearing main bearing outer ring should be with the cover, base close fit, with color method of inspection, the contact area of ​​not less than 70% of the surface area ~ 7 5%, and the spots should be evenly distributed. Main bearing cover and the plane contact with the plane should be handled clean, scraping the bearing should meet the quality requirements. Connecting rod bearing tile back should be closely attached to the seat, with color inspection method, the contact area of ​​not less than 70 ~ 75% of the surface area, and the spots should be evenly distributed. (3) three-piston pump assembly and adjustment
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