After the hub of the pump assembly coupling is assembled on the shaft, the vertical and coaxial degrees of the hub and the shaft should be carefully checked. Usually in the hub of the end and the outer circle set up two dial indicator, turning the wheel when the rotation, observe the hub of the whole beating (including the end of beating and radial run) values, determine the vertical axis and the axis of the axis and coaxial The situation of the situation. Different speed coupling of the requirements of the whole beating different values, different types of coupling on the requirements of the whole beating are also different, but the wheel assembly on the axis after the hub must be the total beating deviation of the value of Design requirements within the tolerance range, which is one of the main quality requirements of the coupling assembly.
Pump assembly caused by the hub of the total beating value does not meet the requirements of many reasons, the first may occur in the manufacturing process due to the error caused by processing for the field assembly, mainly due to correct the wheel hole surface treatment is not correct, so that the hub and axis concentric The degree of deviation. Another reason is that there is a key coupling in the assembly, due to improper assembly of the key caused by the hub and the shaft different axis. The correct installation of the key should be the key side of the key and the keyway wall tightly fit, usually in the assembly with color inspection, with a bad time can be used to repair the file or blade to meet the requirements. Key upper part of the general gap, about 0.1-0.2mm or so. High-speed rotating machinery for the hub and the axis of the coaxial degree of high demand, with a single bond can not get a high degree of coaxial, with double bond or spline connection can make the coaxial degree of both improved.
