Why does the cylinder wear out early?
Answer: The early wear of the cylinder is abnormal wear, and the crushing cylinder belongs to the local severe wear and sebage, which is the accident wear. The reasons are as follows:
First, the manufacturing aspect:
(1). The cylinder (or cylinder liner) is of poor manufacturing quality or has a rough surface;
(2) The connecting rod is not perpendicular to the crankshaft (the connecting rod or the crankshaft is bent);
(3) The center of the piston is not perpendicular to the end surface;
(4). The ring groove of the piston is skewed;
(5). The piston ring is too elastic or the surface hardness is too high (including ternary phosphorus eutectic);
(6). The center of the piston seat is not perpendicular to the center of the piston;
(7). The crankshaft end gap is too large;
(8). The piston ring working opening amount (opening gap) is too small;
(9). The piston is not properly assembled with the eccentric cylinder;
(10). The gap between the piston and the cylinder is too small;
(11). The metallographic structure of the cylinder does not meet the requirements, and it should be a small piece or a Soxhlet volume pearlite. Free structure carbides are not allowed.
Second, the use of maintenance:
(1). The insufficient pressure of the oil pump makes the gas not well lubricated;
(2). The lubricating oil grade is incorrect; too thick or too thin;
(3). When the lubricating oil is used for a long time, it contains mechanical impurities and is replaced in time;
(4). The crankcase filler port does not care about the oil equipment or equipment, so that the dust in the air enters the lubrication of the crankcase;
(5). In a splash-lubricated compressor, the oil rod is broken (or the oil level is too low);
(6). The cooling in the cylinder is not good, the temperature is too high, and the carbon deposit is excessive;
(7). The air filter does not work well, and the air brings a lot of dust into the cylinder.
2. What are the common defects in the connecting rod?
Answer: (1) Bending or twisting occurs in a plane parallel to the crankshaft axis and in a plane perpendicular to the crankshaft axis. The bending or twisting of the former will inevitably destroy the normal operation of the bearing, causing partial wear and even rapid reporting of the bearing and the journal. At the same time, due to the deformation of the connecting rod, the piston will be deflected in the cylinder, resulting in local Contact or seizure cannot work properly.
(2). The small end bushing of the connecting rod and the large end bearing hole grinding loss circle form an elliptical taper. The cooperation with the crankshaft journal or the piston shaw (or crosshead) is not tight, and the excessive gap between the people seriously affects the conduction of heat generated by the friction, resulting in accelerated wear of the wear-resistant alloy of the bushing and the bearing.
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