Vibration caused by bearing wear or insufficient lubrication.Vibration caused by loose fastening bolts.In addition to the above two reasons, the suction dredge pump vibration has the following reasons:
In addition to the balance of its own mass, the balance of a pair of couplings must also meet the following two conditions:ġ) Make the centers of two pairs of wheels coincide, that is, make the outer circles of two pairs of wheels coincide.Ģ) Make the joint surfaces (end faces) of the two pairs of wheels parallel (the two centerlines are parallel). However, in addition to its own mass alignment, the balance of the installation and coordination of the two couplings should also be considered. Coupling leveling and impeller leveling are also to minimize the unbalanced force generated during rotation. The coupler will also be leveled in the later stage after fabrication. But it is far less than the vibration caused by impeller failure. Even the pin coupling, which is common in dredge pumps, will produce violent and transient vibration because the pin / rubber ring and other components cannot meet the axial movement, although the failure of coupling will also cause the vibration of pump. The vibration of motor and pump produces resonance phenomenon in the transmission of coupling, which leads to the intensification of vibration. The vibration caused by coupling is common in dredge pumps, especially the rigid coupling. At this time, it will be found that the vibration amplitude gradually increases from the motor end to the pump end. At this time, the centrifugal force on the heavier side of the dredge pump impeller will increase, especially when the suction dredge pump rotates at high speed, the eccentric load impeller will cause serious unbalanced rotating force. However, after a long time of operation, due to the wear of the impeller and the scabs caused by the adhesion of sand slurry, the overall mass balance of the impeller will be broken, and the corresponding “eccentric load” of the impeller will occur. At this time, the impeller is in the relatively best mass balance state, so the dredge pump is also in the most stable state at this time, The vibration of the equipment is also slight. When the equipment leaves the factory, due to the corresponding inspection and adjustment of various spare parts of the dredge pump, especially the static / dynamic balance detection and drilling / milling alignment of the impeller, the position of the mass imbalance will be processed. The centrifugal force generated by the mass imbalance of the impeller always acts on the dredge pump.
At the same time, the failure of the equipment will aggravate the vibration of the equipment, resulting in a vicious cycle, which will seriously affect the safe operation of the imaging equipment, and thus bring corresponding maintenance costs, as well as production losses caused by equipment failures. The abnormal vibration of the suction dredge pump is the main cause of other failures.
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