Method for correcting load jacking experiment of marine shaft system

Abstract

The invention discloses a method for correcting a load jacking experiment of a marine shaft system, which comprises the following implementation steps of: placing a jack below an optimum point of the shaft system shown in a diagram; placing a dial indicator above the shaft system, wherein a measuring rod of the dial indicator is pressed on the top surface of the shaft system; starting a manual pump, and recording lifting power data of the jack until the jack is jacked to be with the data being the data of the shaft system in a total backlash of bearings; recording pressure data in a pump body as soon as the jack is descended by 0.05mm until the indication of the dial indicator is zero; organizing recorded experimental data, drawing load curve graphs of the ascending and the descending of the jack, and calculating an average value between the two curves, wherein the average value is a bearing load. According to the method disclosed by the invention, the propulsion performance of the marine shaft system and the load borne by each bearing can be more perfect through an effective scientific experiment method of the shaft system jacking, the service lives of the bearings are prolonged by more than three times, and the failure rate of a high-elastic coupling of a gear case and bearing heating is reduced to be zero.

Description

technical field [0001] The invention relates to the field of jacking tests of ship shafting, in particular to a correction method for load jacking tests of ship shafting. Background technique [0002] In the past, people regarded the shafting as a rigid body, and often used the "flat shaft method" for alignment of the shafting. Due to the lack of scientificity, accidents such as excessive load of a certain bearing, heating of the bearing, vibration, etc. often occurred. In fact, the shaft system is an elastic body, and the shaft system calibration is to use the shaft system as an elastic continuous beam to calculate and analyze the force of each support, list three bending moment equations to calculate the bending moment and deflection, and obtain the bearings Optimum load, obtain the given Sag / gap value (that is, opening value and offset value), and use the method of adjusting the support position (bearing) to rationalize the support force. As a result, the "load calibrati...

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Problems solved by technology

[0003] The purpose of the jacking test of the ship shafting is to check the force distribution of the bearings of the main engine, gearbox, shafting, etc. when the main engine is running under the specified draft of the ship. If the force is too small, the bearings will vibrate. A certain bearing is subjected to excessive stress and wear, the bearing generates heat, and its service life is shortened sharply. For the shaft system driven by a large low-speed two-stroke diesel engine, in addition to the shaft lifting test, the crankshaft model provided by the main engine manufacturer, Static thrust shaft load curve diagram for bearing jacking in a diesel engine

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