Aiming at the problem of the broken shaft of slurry pump, it is resulted from the section shape and broken marks for alternating stress. Slurry pump broken shaft is due to fatigue fracture caused by repeated alternating stress, reflected in the operation is in small flow area. When the operation flow rate deviates from the design flow, the radial force will have an effect on the impeller, shaft under alternating stress, deflection of generating directional. Through the practice of that: when the actual throughput is equal to the design flow of minimal axial force. The slurry pump shaft is long time under the alternating stress, accumulated to a certain extent caused by axial section failure, resulting in the shaft fracture problems.
solution: to maximize the slurry pump smooth operation cycle, is proposed to shorten the cleaning pipeline scaling cycle, from 2 months to 1 month. It can maximize the slurry pump operating point near the design point, in order to reduce the fatigue failure, prolong the pump shaft safety running time.
Before the start of the unit it should be checked according to the following steps:
(1)The pump should be placed on a solid basis, with all the weight bearing pump, eliminating vibration, tighten all bolts.
(2)Piping and valves shall be respectively supported.Slurry Pumps Pump flange sealing pad, tighten bolts should be paid attention to when the pump flange sealing surface of high, bolt should not be screwed too tight, so as not to damage the sealing surface.
(3)Use hand to press pump direction of rotation shaft, shaft should be rotated with the impeller and there should be no friction, otherwise it should adjust the impeller clearance.
(4)Check the motor to rotate, to ensure that the direction of the arrow on the pump body pump according to the mark, pay attention to pump does not allow the reverse rotation of impeller, otherwise the thread tripping, resulting in pump damage.
(5)When direct drive, pump shaft and motor shaft should be precise, triangle belt transmission when the pump shaft and motor shaft should be parallel, and adjust the groove wheel position, is a triangle with vertical and the groove wheel, so as not to cause severe vibration and wear. The SPA and SPB and groove wheel type and combination use should be adjusting groove wheel to reach the figure 5 α 1= α 2.
Finally check again all nuts are tightened, the shaft is flexible rotation and then guide bearing washing water 5 minutes from Figure 2 A is switched on, and then start the
Post time: Jul-13-2021