W-type vacuum pump repair methods and quality standards

1 Cylinder 1.1 Measure the cylindricity and cylindricity of the cylinder, determine the boring cylinder or replace it according to its degree of wear. 1.2 Cylinder roundness and cylindricity comply with the provisions of Table 5. Cylinder diameter Maximum wear Circularity Maximum wear Cylinder Boring cylinder Tolerance> 200 ~ 250 0.40 0.25 Soil 0.04> 250 ~ 300 0.45 0.30 Soil 0.05> 300 ~ 350 0.50 0.35 Soil 0.05> 350 ~ 400 0.55 0.40 Soil 0.06> 400 ~ 450 0.60 0.45 Soil 0.06> 450 ~ 500 0.65 0.50 Soil 0.07 1.3 Cylinder surface should be free of cracks, trachoma, scars, grooves and other defects, the surface roughness of 1.6. 1.4 Hammer cylinder cylinder diameter increases shall not exceed 2% of the original size, cylinder wall thickness reduction of not more than 1/12 of the original wall thickness. 1.5 cylinder water jacket does not allow cracks or leaks and other defects. 2 Crankshaft, connecting rod and bearing 2.1 Crankshaft 2.1.1 Measurement crankshaft main journal and crank neck wear degree. Determine repair or replacement, the main journal can be metal plating or spraying method to repair. 2.1.2 The main journal and crank journal wear values ​​in accordance with the provisions of Table 6. 2.1.3 The maximum reduction of crankshaft journal shall not exceed 3% of the original diameter. The maximum wear allowable value journal diameter: ≤ 80 spindle roundness: 0.05 spindle cylindricality: 0.04 crank roundness: 0.05 crank cylindricality: 0.04 journal diameter: 81 ~ 180 spindle roundness: 0.06 spindle neck cylinder Degrees: 0.05 Crank neck roundness: 0.06 Crank neck cylindricity: 0.05 Jaw diameter: 181 ~ 270 Spindle roundness: 0.08 Spindle cylindricality: 0.08 Crank neck roundness: 0.08 Crank neck cylindricality: 0.08 2.1.4 Crankshaft The main journal and crank neck abrasions, dent area shall not be greater than 2% of the journal area, groove depth of 0.10mm, should be grinding repair. 2.1.5 Crankshaft non-destructive testing or magnifying glass inspection that cracks should be replaced when the crankshaft. 2.1.6 crankshaft crank neck axis parallel to the reference axis of the crankshaft 0.20-0.30mm. 2.1.7 Crankshaft straightness is Φ0.05mm. 2.2 Connecting rod 2.2.1 Connecting rod head pin hole axis parallel to the reference axis of the rod is 0.3mm. 2.2.2 connecting rod bending or torsional deformation, rod corrector can be used to check or correct, after correction is still not up to the quality standards that should be replaced. 2.2.3 connecting rod head and small head pin hole centerline perpendicular to the end of the surface is 0.50mm. 2.3 Bearing 2.3.1 bearing alloy should be good fit with the tile, solid without cracks, pores, delamination and other defects. 2.3.2 bearing bush bearing contact area and the back of the contact area of ​​not less than 40-50%, between the two may not place the gasket. 2.3.3 Bearing and journal should be point-like uniform contact, the contact angle should be 60-90. , The contact point of not less than 2-3 points per square centimeter. 2.5.4 Bearing and journal radial clearance should be 1 ‰, (D for the journal diameter). 3 Pistons, Piston Rings 3.1 Piston and piston ring surfaces should be smooth, free from cracks, blisters, scars and other defects. 3.2 Piston and cylinder installation clearance and the relative allowable wear values ​​shown in Table 7. 3.3 Piston ring should have sufficient elasticity, and cylinder wall contact surface length of not less than 60% of the circumference. 3.4 Piston ring in the ring groove, its counterpart should be staggered with each other 120o 3.5 Piston ring counterparts in the cylinder clearance, the groove in the ring groove and the maximum wear value in Table 8. Cylinder Diameter:> 200 ~ 250 Mounting Clearance Pairs: 1.00 Mounting Clearance Backlash: 0.05 ~ 0.07 Allowable Maximum Wear Pairs: 4.00 Allowable Maximum Wear Backlash: 0.20 Cylinder Diameter:> 250 ~ 300 Mounting Clearance Port: 1.20 Mounting Clearance Backlash: 0.06 ~ 0.09 Allowable maximum wear Counterparts: 4.50 Allowable maximum wear Backlash: 0.20 Cylinder Diameter:> 300 ~ 350 Mounting Clearance Pairs: 1.40 Mounting Clearance Backlash: 0.06 ~ 0.09 Allowable Maximum Wear Pairs: 5.00 Allowable Maximum Wear Backlash: 0.20 Cylinder Diameter:> 350 ~ 400 Installation Clearance Counterpart: 1.60 Installation Clearance Backlash: 0.70 ~ 0.10 Allowable Maximum Wear Counterpart: 5.50 Maximum Wear Backlash: 0.20 Cylinder Diameter:> 400 ~ 450 Installation Clearance Counter: 1.80 Installation Clearance Backlash: 0.70 ~ 0.10 Allowable maximum wear Counterpart: 6.00 Allowable maximum wear Backlash: 0.20 Cylinder Diameter:> 450 ~ 500 Mounting Clearance Counterparts: 2.00 Mounting Clearance Backlash: 0.09 ~ 0.12 Allowable Maximum Wear Counterpart: 6.50 Allowable Maximum Wear Backlash: 0.20 4 Piston Rod 4.1 The maximum wear value of the piston rod must not exceed 0 .05-0.07D (D is the piston rod diameter). 4.2 The straightness of piston rod is Φ0.10mm. 5 valve and seat 5.1 valve and valve seat with no pitting, scratches and other defects. 5.2 valve and valve seat should be closely linked with the kerosene test may not have continuous leakage within five minutes. 5.3 Valve spring should have sufficient elasticity, the same valve spring free height should be consistent. 6 crosshead and guide crosshead diameter installation clearance 80-120 0.20-0.24> 120-180 0.24-0.29> 180-260 0.29-0.34 6.1 crosshead should be no defects such as cracks 6.2 Crosshead pin maximum wear not greater than 0.50mm. 6.3 The clearance between the crosshead and the guide rail shall comply with the provisions of Table 9. 6.4 crosshead pin and the gap between the bushing is 0.03-0.06mm. 6.5 crosshead and rail contact surface 60%, the contact point should be evenly distributed. 7 adjustment requirements 7.1 before and after the piston piston clearance of 1.50-2.00mm. 7.2 valve position adjustment method is as follows: a. Crankshaft crankshaft just before the dead point; b. Eccentric wheel position in the vertical line of the highest point; c. Place the valve on the center of the cylinder seat. D. The entire valve actuator in the above position fixed. Search Keyword: More Valve Technology Valve Products Supply Information

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