The inspection found that the shoulders of the main and driven shafts have different degrees of wear, and the drive shaft wears more severely. It can be clearly seen that the spring seat wears the shaft very seriously and produces many axial deep grooves due to A relative movement in the circumferential direction occurs between the spring seat and the shaft. The change of overload and pressing force causes the gear pump to generate heat and current, and the dry friction and friction factor of direct contact between the two surfaces are reduced, resulting in shaft wear and burn.
Under normal circumstances, the spring seat is fastened to the bushing by the set screw, and the moving ring seat and the spring seat are driven by the shifting fork. The spring seat and the moving ring seat rotate axially together with the bushing, the spring seat and the shaft There is no relative motion between them, and there is only a slight axial relative motion between the moving ring seat and the shaft. The reason for the relative movement between the spring seat and the shaft in the circumferential direction is as follows: (1) The set screw on the spring seat is not fastened in place, and there is a fuzzy trace of the set screw on the shaft. (2) The shifting fork is driven between the spring seat and the moving ring seat. When installing, the forks of the two should be correspondingly concave and convex, and compressed to the required working height. If the two are convex and convex, the effect of the moving ring seat being driven can not be ensured. The position of the printing plate fastened to the shaft by the set screw on the spring seat will be farther than normal, resulting in insufficient compression of the spring. (3) After the O-ring seal fails, the material leaks into the sealed cavity along the shaft, self-polymerizes and solidifies, causes the spring to fail, the stress concentrates on the set screw, and the overload causes the screw to displace. (4) When the leakage fault starts, the pump vibration is too large. When disassembling, it is found that the gear pump and the base anchor bolt have loose signs, which is the direct cause of the vibration. If the vibration and turbulence of the pump exceed the standard, the above results will also appear. It is observed that there is no obvious wear on the sealing end face and the gear meshing surface, and there are 8 sets of deep groove ball bearings positioned to eliminate the excessive turbulence of the shaft.
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