Method and device for disassembling segmented crankshaft of marine low-speed diesel engine

Abstract

The invention discloses a dismounting and mounting method and device of a segmented crankshaft of a marine low speed diesel engine. The device comprises a lower bearing bush fixed tool, a built-in operation platform, a centering tool, a front-and-back crankshaft connecting hydraulic expansion bolt, a crankshaft chain wheel connecting hydraulic expansion bolt, a short stop plate and a long stop plate. The hydraulic expansion bolt is adopted to replace a traditional fitting bolt, and in the mounting process, hydraulic pressure is used for enabling a tapered bushing to be expanded, so that interference fit of the hydraulic expansion bolt and the surface of a connecting hole is achieved, torque transmission is ensured, in the dismounting process, the hydraulic pressure is used for enabling the conical bushing to be restored, the clearance fit between hole shafts is achieved, and the damage to the inner wall of the connecting hole is avoided. According to the device, nondestructively disassembling is achieved, the scrap returning rate is reduced, and the advantages of being easy and convenient to dismount and mount, high in operation efficiency, high in tool generality and long in service life are achieved. The device is suitable for manufacturing and mounting of all large type ship low-speed diesel engines with segmented crankshaft structure.

Description

[0001] Technical field: [0002] The invention relates to a manufacturing process of a marine low-speed diesel engine, in particular to a method for disassembling and assembling a sectioned crankshaft of a marine low-speed diesel engine, and belongs to the technical field of diesel engine manufacturing. [0003] Background technique: [0004] In recent years, in order to control the greenhouse effect caused by gas emissions in the shipping industry and improve the energy efficiency of ships, the International Maritime Organization has formulated a series of strict rules, and put forward many requirements for the emission and energy efficiency of main engines. Due to the current shipping situation and considering factors such as freight rates and fuel costs, ultra-large marine low-speed diesel engines are more and more widely used on container ships. Due to the large length of the ultra-large multi-cylinder main engine (the 10-cylinder main engine is about 20 meters long), it is...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to break through the difficult bottleneck of dismantling the segmented crankshaft of the existing diesel engine, and provide an efficient, fast and safe disassembly method and device for the segmented crankshaft of the marine low-speed diesel engine, which satisfies the connection and installation requirements of the segmented crankshaft. The dismantling requirements not only ensure the interference fit between the connecting bolt and the surface of the connecting hole, realize the transmission of the torque required by the train, but also facilitate the disassembly and removal of the connecting bolt, avoiding damage to the connecting hole, and achieve the effect of non-destructive disassembly. The purpose of improving labor efficiency, optimizing process flow, and reducing production and waste return costs

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