What are the reasons for the loss of the crosshead pin in a reciprocating compressor?
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What are the reasons for the loss of the crosshead pin in a reciprocating compressor? How should one prevent it from falling off?
It’s a tapered pin; it seems that the small pin at the tip of the pin isn’t locked in place, or perhaps the small pin has failed due to insufficient strength. Is it also possible that the clearance between the crank bearing shells is too large, and the torque on the crank causes the crosshead pin to move?
What are the reasons for the loss of the crosshead pin in a reciprocating compressor? How should one prevent it from falling off? ------------------------------------------------------------------------------------ The pin itself has a certain taper, and the end of the pin should have a retaining ring.
It is likely that the positioning locking bolt was not secured by the locking washer, causing the bolt to come loose and resulting in the failure of the locking mechanism, which in turn led to the detachment of the compressor’s crosshead pin.
1. The anti-loosening measures for the baffle bolts have failed (such as lock washers, steel wires, etc.). 2. Excessive clearance in the crosshead pin can lead to sudden bolt failure or loosening due to shock vibrations. 3. Regular tightness checks should be carried out on the key parts of the compressor.
I think there’s another reason: the compressor starts and stops too frequently
Such a problem should generally not occur. The crosshead pin is mainly in contact with the crosshead as well as the small copper sleeve; there is an interference fit between the crosshead and the copper sleeve, while there is a loose fit between the copper sleeve and the crosshead. Under normal circumstances, there is no force acting along the axial direction of the pin at the crosshead, so the movement in this direction is minimal, and it is highly unlikely that the pin will come loose.
It does happen that the crosshead pin comes loose; during operation of the machine, this can occur due to careless handling by the operators. Before the crosshead pin falls out, there are usually significant abnormal noises coming from the crosshead area. Generally, to prevent the crosshead pin from coming loose, a pressure plate is installed at the larger end of the crosshead pin, or bolts are used at the smaller end to hold it in place and prevent it from moving backward. The best approach, however, is to extend the smaller end of the crosshead so that it protrudes beyond the end face of the crosshead body, giving it a threaded structure. A hexagonal nut can then be used to secure it, with a split pin added to prevent the nut from loosening. This has a higher level of security.