Was established in 1998, is a collection of r & dproduction, trade as one of the high-tech company, the company specializes in manufacturing various micro-motor shaft...
Was established in 1998, is a collection of r &d production, trade as one of the high-tech company, the company specializes in manufacturing various micro-motor shaft...
Our machine including large CNC lathe, CNC machining center, CNC centerless grinding machine, CNC Incisive grinding machine, CNC cylindrical grinding machine, heat treatment machine.
Analysis of pump shaft wear causes
Normal metal fatigue wear: Since the water ring vacuum pump is in a high load working state, the metal fatigue characteristics of the metal itself will be manifested in a certain period, resulting in a gap between the bearing and the shaft mating surface. pump shaft It will lead to the matching clearance during the operation, the relative movement of the bearing and the shaft surface, and the severe wear of the shaft or the bearing chamber in a short time;
Machining size error: If the interference between the rotor shaft and the bearing is too small or the contact contact area is too small, there will be a gap between the bearing and the rotor shaft under the heavy load of the vacuum pump;
Maintenance and repair: maintenance and maintenance are not timely or irregular, bearing lubrication is insufficient, bearing axial positioning control or axial expansion and contraction of the reserved equipment causes the bearing clearance to increase, which will also cause the shaft and bearing to sway and wear. .
The high-pressure water pump has a precise structure, a small gap between the moving and static parts, a high rotational speed of the rotor, and a heavy load on the shaft, so the requirements on the shaft are strict. The bending of the shaft is generally not allowed to exceed 0.05 mm, otherwise straight shaft operation should be performed. If the pump shaft is found to have one of the following conditions after disassembly, the new shaft should be replaced. The surface of the shaft has cracks; the surface of the shaft is washed by a high-speed water flow to produce deep groove marks, especially at the keyway, the shaft is greatly curved, pump shaft and is bent by multiple straight axes. For individual parts of the pump shaft, there are bristles or elbows that can be repaired by thermal spraying or plating.
When measuring the bending of the shaft, it should be carried out at room temperature. Most of the shafts can be measured on a flat or flat concrete floor, supporting both ends of the journal on a ball cage or V-shaped iron, while heavy-duty shafts such as turbine rotor shafts are typically carried out on the bearings of the body. The axial yaw should be limited to 0.1mm before measurement.
The steps to measure the bending of the shaft are as follows:
(1) The shaft is equally divided into several measuring sections along the axial direction, and the measuring surface should be selected as far as possible in a smooth circular section with no wear and burrs in the perfect circle.
(2) Divide the end face of the shaft into several equal parts (generally eight equal parts). The shaft with the coupling can be divided into the bolt holes of the coupling, as shown in the following figure (a); the shaft without the coupling is divided equally by the keyway, as shown in the following figure (b); and the permanent mark is made. . The aliquot is used as the measuring point, and all subsequent measurement records should be consistent with these marks.
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