Crank shaft installation alignment method for diesel engine of ten-thousand-ton oil tanker

Abstract

The invention provides a crank shaft installation alignment method for a diesel engine of a ten-thousand-ton oil tanker and relates to the field of mechanical assembly. The method includes the following steps that a crank shaft is installed and dragged through left sleeves and right sleeves of center frames, the distance between the end face of the crank shaft and a disc chuck is measured, elastic jaws can correctly clamp the circumference of a flange, before the crank shaft is finally installed in place, the position of each center frame can be properly adjusted, the center frames are prevented from intervening in a crank throw, a dial indicator is installed on the disc chuck, a measuring head is arranged on the circumference of the flange, the disc chuck is rotated, an indicated number of the dial indicator is observed, the left sleeve and the right sleeve of the center frame tightly adjacent to the disc chuck are flexibly adjusted, a dial indicator is arranged on the plane of a front circle of a tail base, the measuring head is arranged on the portion, close to the tail base, of the circumference of the flange, a spindle of the tail base is rotated, an indicated number of the dial indicator is observed, and the left sleeve and the right sleeve of the center frame tightly adjacent to the tail base are flexibly adjusted until the left sleeve and the right sleeve are coaxial in the tolerance. According to the method, time and labor are saved for alignment and overall deformation of the installed crank shaft is small.

Description

technical field [0001] The invention relates to the field of mechanical assembly, in particular to a method for aligning and installing a crankshaft of a 10,000-ton giant ship diesel engine. technical background [0002] The crankshaft of a diesel engine is the main key moving part of a diesel engine. The crankshaft is subjected to two moments of bending and torsion at the same time, and is one of the most stressed parts of the diesel engine with complex stress conditions. In the design of a diesel engine, the crankshaft is constrained radially by the main bearing and axially by the thrust plate, which is actually an overconstrained state. In order to ensure uniform force on each crankshaft, the machining and assembly accuracy and coaxiality of each main bearing bore shaft must be strictly limited to avoid rapid wear of the bearing bush due to over-constrained force. It is generally easier to ensure the coaxiality accuracy of the main bearing hole and shaft during the ...